./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-examples/sorting_selectionsort_ground-1.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 5e519f3a 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_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-examples/sorting_selectionsort_ground-1.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI --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 5aa72773233f17156d62ec9c7729aefdd69e77cc68e9bdd6e006eaf36895d27a --- 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-5e519f3 [2022-11-03 02:35:36,984 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-03 02:35:36,986 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-03 02:35:37,026 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-03 02:35:37,026 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-03 02:35:37,027 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-03 02:35:37,028 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-03 02:35:37,030 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-03 02:35:37,031 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-03 02:35:37,032 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-03 02:35:37,033 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-03 02:35:37,034 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-03 02:35:37,035 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-03 02:35:37,036 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-03 02:35:37,039 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-03 02:35:37,040 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-03 02:35:37,041 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-03 02:35:37,042 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-03 02:35:37,043 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-03 02:35:37,045 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-03 02:35:37,047 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-03 02:35:37,048 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-03 02:35:37,049 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-03 02:35:37,050 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-03 02:35:37,054 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-03 02:35:37,064 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-03 02:35:37,065 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-03 02:35:37,066 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-03 02:35:37,066 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-03 02:35:37,067 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-03 02:35:37,067 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-03 02:35:37,068 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-03 02:35:37,069 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-03 02:35:37,070 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-03 02:35:37,070 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-03 02:35:37,071 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-03 02:35:37,072 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-03 02:35:37,074 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-03 02:35:37,074 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-03 02:35:37,075 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-03 02:35:37,076 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-03 02:35:37,078 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-03 02:35:37,110 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-03 02:35:37,111 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-03 02:35:37,111 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-03 02:35:37,111 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-03 02:35:37,112 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-03 02:35:37,113 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-03 02:35:37,113 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-03 02:35:37,113 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-03 02:35:37,113 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-03 02:35:37,113 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-03 02:35:37,114 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-03 02:35:37,115 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-03 02:35:37,115 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-03 02:35:37,115 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-03 02:35:37,115 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-03 02:35:37,116 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-03 02:35:37,116 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-03 02:35:37,116 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-03 02:35:37,117 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-03 02:35:37,117 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-03 02:35:37,117 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-03 02:35:37,117 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-03 02:35:37,118 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-03 02:35:37,118 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-03 02:35:37,118 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-03 02:35:37,118 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-03 02:35:37,118 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-03 02:35:37,119 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-03 02:35:37,119 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-03 02:35:37,119 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-03 02:35:37,119 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-03 02:35:37,120 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-03 02:35:37,120 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-03 02:35:37,120 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-03 02:35:37,120 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-03 02:35:37,121 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-03 02:35:37,121 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-03 02:35:37,121 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-03 02:35:37,121 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-03 02:35:37,121 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-03 02:35:37,122 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-03 02:35:37,122 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_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 5aa72773233f17156d62ec9c7729aefdd69e77cc68e9bdd6e006eaf36895d27a [2022-11-03 02:35:37,372 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-03 02:35:37,393 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-03 02:35:37,396 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-03 02:35:37,397 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-03 02:35:37,400 INFO L275 PluginConnector]: CDTParser initialized [2022-11-03 02:35:37,402 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/../../sv-benchmarks/c/array-examples/sorting_selectionsort_ground-1.i [2022-11-03 02:35:37,476 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/data/60a45db4b/e3d57479a37543f78baf3e4e35b12a9c/FLAG450939bec [2022-11-03 02:35:37,949 INFO L306 CDTParser]: Found 1 translation units. [2022-11-03 02:35:37,950 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/sv-benchmarks/c/array-examples/sorting_selectionsort_ground-1.i [2022-11-03 02:35:37,956 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/data/60a45db4b/e3d57479a37543f78baf3e4e35b12a9c/FLAG450939bec [2022-11-03 02:35:38,324 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/data/60a45db4b/e3d57479a37543f78baf3e4e35b12a9c [2022-11-03 02:35:38,326 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-03 02:35:38,328 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-03 02:35:38,329 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-03 02:35:38,330 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-03 02:35:38,333 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-03 02:35:38,335 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 02:35:38" (1/1) ... [2022-11-03 02:35:38,337 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@13d0ad00 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:35:38, skipping insertion in model container [2022-11-03 02:35:38,338 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 02:35:38" (1/1) ... [2022-11-03 02:35:38,345 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-03 02:35:38,365 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-03 02:35:38,557 WARN L230 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_fa204592-ef98-4465-80f5-7c646218373a/sv-benchmarks/c/array-examples/sorting_selectionsort_ground-1.i[823,836] [2022-11-03 02:35:38,620 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-03 02:35:38,628 INFO L203 MainTranslator]: Completed pre-run [2022-11-03 02:35:38,655 WARN L230 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_fa204592-ef98-4465-80f5-7c646218373a/sv-benchmarks/c/array-examples/sorting_selectionsort_ground-1.i[823,836] [2022-11-03 02:35:38,675 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-03 02:35:38,692 INFO L208 MainTranslator]: Completed translation [2022-11-03 02:35:38,692 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:35:38 WrapperNode [2022-11-03 02:35:38,693 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-03 02:35:38,694 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-03 02:35:38,694 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-03 02:35:38,694 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-03 02:35:38,702 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:35:38" (1/1) ... [2022-11-03 02:35:38,723 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:35:38" (1/1) ... [2022-11-03 02:35:38,758 INFO L138 Inliner]: procedures = 16, calls = 25, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 114 [2022-11-03 02:35:38,760 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-03 02:35:38,761 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-03 02:35:38,761 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-03 02:35:38,761 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-03 02:35:38,770 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:35:38" (1/1) ... [2022-11-03 02:35:38,770 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:35:38" (1/1) ... [2022-11-03 02:35:38,777 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:35:38" (1/1) ... [2022-11-03 02:35:38,777 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:35:38" (1/1) ... [2022-11-03 02:35:38,795 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:35:38" (1/1) ... [2022-11-03 02:35:38,805 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:35:38" (1/1) ... [2022-11-03 02:35:38,809 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:35:38" (1/1) ... [2022-11-03 02:35:38,812 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:35:38" (1/1) ... [2022-11-03 02:35:38,814 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-03 02:35:38,821 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-03 02:35:38,822 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-03 02:35:38,822 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-03 02:35:38,823 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:35:38" (1/1) ... [2022-11-03 02:35:38,830 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-03 02:35:38,840 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:35:38,858 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-03 02:35:38,884 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-03 02:35:38,902 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-03 02:35:38,902 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-03 02:35:38,902 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-11-03 02:35:38,903 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-11-03 02:35:38,903 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-03 02:35:38,903 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-03 02:35:38,903 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-11-03 02:35:38,903 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-11-03 02:35:38,904 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-11-03 02:35:38,904 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-11-03 02:35:39,007 INFO L235 CfgBuilder]: Building ICFG [2022-11-03 02:35:39,009 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-03 02:35:39,287 INFO L276 CfgBuilder]: Performing block encoding [2022-11-03 02:35:39,376 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-03 02:35:39,377 INFO L300 CfgBuilder]: Removed 8 assume(true) statements. [2022-11-03 02:35:39,379 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 02:35:39 BoogieIcfgContainer [2022-11-03 02:35:39,379 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-03 02:35:39,381 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-03 02:35:39,381 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-03 02:35:39,386 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-03 02:35:39,387 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 03.11 02:35:38" (1/3) ... [2022-11-03 02:35:39,388 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3c56731a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 02:35:39, skipping insertion in model container [2022-11-03 02:35:39,388 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:35:38" (2/3) ... [2022-11-03 02:35:39,388 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3c56731a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 02:35:39, skipping insertion in model container [2022-11-03 02:35:39,389 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 02:35:39" (3/3) ... [2022-11-03 02:35:39,391 INFO L112 eAbstractionObserver]: Analyzing ICFG sorting_selectionsort_ground-1.i [2022-11-03 02:35:39,409 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-03 02:35:39,410 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-03 02:35:39,485 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-03 02:35:39,499 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;@6432e64, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-03 02:35:39,499 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-03 02:35:39,507 INFO L276 IsEmpty]: Start isEmpty. Operand has 22 states, 16 states have (on average 1.625) internal successors, (26), 17 states have internal predecessors, (26), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-03 02:35:39,514 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-03 02:35:39,515 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:35:39,515 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:35:39,516 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:35:39,523 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:35:39,524 INFO L85 PathProgramCache]: Analyzing trace with hash 1511467156, now seen corresponding path program 1 times [2022-11-03 02:35:39,533 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:35:39,534 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [940786175] [2022-11-03 02:35:39,535 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:35:39,535 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:35:39,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:35:39,763 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:35:39,764 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:35:39,764 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [940786175] [2022-11-03 02:35:39,765 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [940786175] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:35:39,765 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 02:35:39,765 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-03 02:35:39,767 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1773525152] [2022-11-03 02:35:39,768 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:35:39,772 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 02:35:39,772 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:35:39,800 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 02:35:39,800 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-03 02:35:39,803 INFO L87 Difference]: Start difference. First operand has 22 states, 16 states have (on average 1.625) internal successors, (26), 17 states have internal predecessors, (26), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:35:39,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:35:39,894 INFO L93 Difference]: Finished difference Result 43 states and 66 transitions. [2022-11-03 02:35:39,898 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 02:35:39,900 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2022-11-03 02:35:39,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:35:39,907 INFO L225 Difference]: With dead ends: 43 [2022-11-03 02:35:39,907 INFO L226 Difference]: Without dead ends: 22 [2022-11-03 02:35:39,910 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-03 02:35:39,914 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 0 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:35:39,915 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 34 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 27 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 02:35:39,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2022-11-03 02:35:39,989 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2022-11-03 02:35:39,991 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 17 states have (on average 1.4705882352941178) internal successors, (25), 17 states have internal predecessors, (25), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-03 02:35:39,995 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 31 transitions. [2022-11-03 02:35:39,996 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 31 transitions. Word has length 9 [2022-11-03 02:35:39,996 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:35:39,997 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 31 transitions. [2022-11-03 02:35:39,998 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:35:39,998 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 31 transitions. [2022-11-03 02:35:40,000 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-11-03 02:35:40,000 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:35:40,001 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:35:40,001 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-03 02:35:40,001 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:35:40,002 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:35:40,002 INFO L85 PathProgramCache]: Analyzing trace with hash 1913202077, now seen corresponding path program 1 times [2022-11-03 02:35:40,003 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:35:40,004 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1565178513] [2022-11-03 02:35:40,004 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:35:40,005 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:35:40,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:35:40,147 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:35:40,147 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:35:40,148 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1565178513] [2022-11-03 02:35:40,148 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1565178513] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:35:40,148 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1383693939] [2022-11-03 02:35:40,148 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:35:40,148 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:35:40,149 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:35:40,152 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:35:40,172 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-03 02:35:40,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:35:40,227 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-03 02:35:40,235 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:35:40,270 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 02:35:40,271 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 02:35:40,271 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1383693939] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:35:40,271 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-03 02:35:40,271 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 5 [2022-11-03 02:35:40,272 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [864371542] [2022-11-03 02:35:40,272 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:35:40,273 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 02:35:40,273 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:35:40,274 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 02:35:40,274 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-03 02:35:40,274 INFO L87 Difference]: Start difference. First operand 22 states and 31 transitions. Second operand has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:35:40,351 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:35:40,353 INFO L93 Difference]: Finished difference Result 41 states and 58 transitions. [2022-11-03 02:35:40,353 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 02:35:40,353 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2022-11-03 02:35:40,354 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:35:40,355 INFO L225 Difference]: With dead ends: 41 [2022-11-03 02:35:40,355 INFO L226 Difference]: Without dead ends: 31 [2022-11-03 02:35:40,356 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-03 02:35:40,357 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 11 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:35:40,358 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 28 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 02:35:40,360 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2022-11-03 02:35:40,367 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 23. [2022-11-03 02:35:40,372 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 18 states have (on average 1.4444444444444444) internal successors, (26), 18 states have internal predecessors, (26), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-03 02:35:40,375 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 32 transitions. [2022-11-03 02:35:40,376 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 32 transitions. Word has length 10 [2022-11-03 02:35:40,376 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:35:40,376 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 32 transitions. [2022-11-03 02:35:40,376 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:35:40,377 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 32 transitions. [2022-11-03 02:35:40,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-11-03 02:35:40,378 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:35:40,378 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:35:40,417 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-03 02:35:40,596 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:35:40,597 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:35:40,597 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:35:40,597 INFO L85 PathProgramCache]: Analyzing trace with hash -811537542, now seen corresponding path program 1 times [2022-11-03 02:35:40,598 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:35:40,598 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [894095395] [2022-11-03 02:35:40,598 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:35:40,598 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:35:40,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:35:40,718 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:35:40,719 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:35:40,719 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [894095395] [2022-11-03 02:35:40,719 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [894095395] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:35:40,722 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [319541298] [2022-11-03 02:35:40,722 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:35:40,723 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:35:40,723 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:35:40,729 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:35:40,731 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-03 02:35:40,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:35:40,787 INFO L263 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-03 02:35:40,788 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:35:40,817 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:35:40,817 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:35:40,837 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:35:40,837 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [319541298] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:35:40,838 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2008845409] [2022-11-03 02:35:40,856 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-03 02:35:40,856 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:35:40,860 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:35:40,865 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:35:40,865 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:35:40,928 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:35:40,950 INFO L356 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-03 02:35:40,951 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2022-11-03 02:35:40,965 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:35:40,983 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:35:40,983 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-03 02:35:41,059 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:35:41,062 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-03 02:35:41,228 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:35:41,231 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 02:35:41,265 INFO L356 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-03 02:35:41,266 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 192 treesize of output 191 [2022-11-03 02:35:41,469 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:35:41,492 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:35:41,553 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [2008845409] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:35:41,553 INFO L184 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:35:41,553 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [3, 3, 3] total 9 [2022-11-03 02:35:41,554 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [898939711] [2022-11-03 02:35:41,554 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:35:41,555 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-03 02:35:41,555 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:35:41,556 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-03 02:35:41,557 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2022-11-03 02:35:41,557 INFO L87 Difference]: Start difference. First operand 23 states and 32 transitions. Second operand has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:35:41,691 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:35:41,691 INFO L93 Difference]: Finished difference Result 51 states and 75 transitions. [2022-11-03 02:35:41,691 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-03 02:35:41,692 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2022-11-03 02:35:41,692 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:35:41,694 INFO L225 Difference]: With dead ends: 51 [2022-11-03 02:35:41,694 INFO L226 Difference]: Without dead ends: 32 [2022-11-03 02:35:41,697 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2022-11-03 02:35:41,704 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 10 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 67 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:35:41,708 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 35 Invalid, 67 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 65 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 02:35:41,708 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2022-11-03 02:35:41,712 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 24. [2022-11-03 02:35:41,713 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 19 states have (on average 1.4210526315789473) internal successors, (27), 19 states have internal predecessors, (27), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-03 02:35:41,714 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 33 transitions. [2022-11-03 02:35:41,714 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 33 transitions. Word has length 11 [2022-11-03 02:35:41,714 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:35:41,714 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 33 transitions. [2022-11-03 02:35:41,714 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:35:41,715 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 33 transitions. [2022-11-03 02:35:41,715 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-11-03 02:35:41,715 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:35:41,715 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:35:41,756 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-03 02:35:41,940 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:35:41,940 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:35:41,941 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:35:41,941 INFO L85 PathProgramCache]: Analyzing trace with hash -531083360, now seen corresponding path program 1 times [2022-11-03 02:35:41,941 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:35:41,941 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1242586664] [2022-11-03 02:35:41,942 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:35:41,942 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:35:41,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:35:42,019 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 02:35:42,020 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:35:42,020 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1242586664] [2022-11-03 02:35:42,020 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1242586664] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:35:42,020 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1476588394] [2022-11-03 02:35:42,021 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:35:42,021 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:35:42,021 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:35:42,022 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:35:42,040 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-03 02:35:42,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:35:42,079 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-03 02:35:42,081 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:35:42,091 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 02:35:42,091 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:35:42,106 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 02:35:42,107 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1476588394] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:35:42,107 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [118588813] [2022-11-03 02:35:42,109 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-03 02:35:42,109 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:35:42,110 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:35:42,110 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:35:42,110 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:35:42,127 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:35:42,140 INFO L356 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-03 02:35:42,141 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2022-11-03 02:35:42,151 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:35:42,168 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:35:42,168 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-03 02:35:42,193 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:35:42,194 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-03 02:35:42,271 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:35:42,275 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:35:42,290 INFO L356 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-03 02:35:42,291 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 202 treesize of output 190 [2022-11-03 02:35:42,370 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:35:42,444 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:35:42,446 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 26 [2022-11-03 02:35:42,475 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2022-11-03 02:35:42,481 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:35:42,686 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [118588813] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:35:42,686 INFO L184 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:35:42,686 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [3, 3, 3] total 13 [2022-11-03 02:35:42,687 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [743560246] [2022-11-03 02:35:42,687 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:35:42,687 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-11-03 02:35:42,688 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:35:42,688 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-11-03 02:35:42,689 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=136, Unknown=0, NotChecked=0, Total=182 [2022-11-03 02:35:42,690 INFO L87 Difference]: Start difference. First operand 24 states and 33 transitions. Second operand has 9 states, 8 states have (on average 1.375) internal successors, (11), 7 states have internal predecessors, (11), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:35:42,820 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:35:42,820 INFO L93 Difference]: Finished difference Result 55 states and 78 transitions. [2022-11-03 02:35:42,821 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-03 02:35:42,821 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 1.375) internal successors, (11), 7 states have internal predecessors, (11), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2022-11-03 02:35:42,821 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:35:42,822 INFO L225 Difference]: With dead ends: 55 [2022-11-03 02:35:42,823 INFO L226 Difference]: Without dead ends: 36 [2022-11-03 02:35:42,823 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=46, Invalid=136, Unknown=0, NotChecked=0, Total=182 [2022-11-03 02:35:42,825 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 19 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 77 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 91 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 77 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:35:42,826 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [21 Valid, 34 Invalid, 91 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 77 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 02:35:42,828 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2022-11-03 02:35:42,841 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 32. [2022-11-03 02:35:42,841 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 25 states have (on average 1.36) internal successors, (34), 26 states have internal predecessors, (34), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2022-11-03 02:35:42,842 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 42 transitions. [2022-11-03 02:35:42,842 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 42 transitions. Word has length 12 [2022-11-03 02:35:42,842 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:35:42,843 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 42 transitions. [2022-11-03 02:35:42,843 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 1.375) internal successors, (11), 7 states have internal predecessors, (11), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:35:42,843 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 42 transitions. [2022-11-03 02:35:42,844 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-11-03 02:35:42,844 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:35:42,844 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:35:42,884 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-03 02:35:43,067 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:35:43,068 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:35:43,068 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:35:43,068 INFO L85 PathProgramCache]: Analyzing trace with hash -563817593, now seen corresponding path program 1 times [2022-11-03 02:35:43,069 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:35:43,069 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1666820185] [2022-11-03 02:35:43,069 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:35:43,069 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:35:43,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:35:43,148 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-03 02:35:43,148 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:35:43,148 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1666820185] [2022-11-03 02:35:43,149 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1666820185] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:35:43,149 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1431369394] [2022-11-03 02:35:43,149 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:35:43,149 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:35:43,149 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:35:43,150 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:35:43,155 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-03 02:35:43,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:35:43,222 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-03 02:35:43,223 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:35:43,233 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-11-03 02:35:43,233 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:35:43,252 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-03 02:35:43,252 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1431369394] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:35:43,252 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1460248689] [2022-11-03 02:35:43,255 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-03 02:35:43,255 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:35:43,255 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:35:43,256 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:35:43,256 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:35:43,270 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:35:43,299 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:35:43,300 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-03 02:35:43,312 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:35:43,313 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2022-11-03 02:35:43,341 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:35:43,342 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-03 02:35:43,391 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:35:43,394 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:35:43,407 INFO L356 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-03 02:35:43,408 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 202 treesize of output 190 [2022-11-03 02:35:43,460 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:35:43,508 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:35:43,509 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 26 [2022-11-03 02:35:43,991 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 16 for LOIs [2022-11-03 02:35:44,006 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:35:44,383 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '791#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:35:44,384 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:35:44,384 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:35:44,384 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 3, 4] total 7 [2022-11-03 02:35:44,384 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1490709012] [2022-11-03 02:35:44,384 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:35:44,385 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-03 02:35:44,385 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:35:44,385 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-03 02:35:44,386 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=212, Unknown=0, NotChecked=0, Total=272 [2022-11-03 02:35:44,386 INFO L87 Difference]: Start difference. First operand 32 states and 42 transitions. Second operand has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 7 states have internal predecessors, (22), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-03 02:35:44,430 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:35:44,430 INFO L93 Difference]: Finished difference Result 64 states and 86 transitions. [2022-11-03 02:35:44,431 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-03 02:35:44,431 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 7 states have internal predecessors, (22), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 19 [2022-11-03 02:35:44,431 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:35:44,433 INFO L225 Difference]: With dead ends: 64 [2022-11-03 02:35:44,433 INFO L226 Difference]: Without dead ends: 35 [2022-11-03 02:35:44,433 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 42 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=60, Invalid=212, Unknown=0, NotChecked=0, Total=272 [2022-11-03 02:35:44,434 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 0 mSDsluCounter, 81 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 68 SdHoareTripleChecker+Invalid, 54 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-03 02:35:44,434 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 68 Invalid, 54 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-03 02:35:44,435 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2022-11-03 02:35:44,440 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2022-11-03 02:35:44,441 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 28 states have (on average 1.3214285714285714) internal successors, (37), 29 states have internal predecessors, (37), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2022-11-03 02:35:44,442 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2022-11-03 02:35:44,442 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 19 [2022-11-03 02:35:44,442 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:35:44,442 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2022-11-03 02:35:44,442 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 7 states have internal predecessors, (22), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-03 02:35:44,443 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2022-11-03 02:35:44,443 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-11-03 02:35:44,443 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:35:44,443 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:35:44,484 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-03 02:35:44,644 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:35:44,644 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:35:44,645 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:35:44,645 INFO L85 PathProgramCache]: Analyzing trace with hash 1633633328, now seen corresponding path program 2 times [2022-11-03 02:35:44,645 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:35:44,645 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [166152567] [2022-11-03 02:35:44,645 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:35:44,645 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:35:44,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:35:44,796 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-03 02:35:44,797 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:35:44,797 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [166152567] [2022-11-03 02:35:44,797 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [166152567] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:35:44,797 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [312183435] [2022-11-03 02:35:44,797 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:35:44,797 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:35:44,798 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:35:44,799 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:35:44,823 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-03 02:35:44,866 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-03 02:35:44,867 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:35:44,868 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-03 02:35:44,869 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:35:44,894 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-11-03 02:35:44,894 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:35:44,933 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-03 02:35:44,934 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [312183435] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:35:44,934 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1649007912] [2022-11-03 02:35:44,936 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-03 02:35:44,936 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:35:44,936 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:35:44,937 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:35:44,937 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:35:44,947 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:35:44,962 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:35:44,963 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-03 02:35:44,971 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:35:44,972 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2022-11-03 02:35:44,987 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:35:44,988 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-03 02:35:45,032 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:35:45,035 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:35:45,049 INFO L356 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-03 02:35:45,049 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 202 treesize of output 190 [2022-11-03 02:35:45,091 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:35:45,129 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:35:45,130 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 26 [2022-11-03 02:35:45,506 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 16 for LOIs [2022-11-03 02:35:45,523 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:35:45,971 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1103#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:35:45,972 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:35:45,972 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:35:45,972 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 5, 5] total 13 [2022-11-03 02:35:45,972 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [497188967] [2022-11-03 02:35:45,972 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:35:45,973 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-11-03 02:35:45,973 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:35:45,973 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-11-03 02:35:45,974 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=415, Unknown=0, NotChecked=0, Total=506 [2022-11-03 02:35:45,974 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand has 13 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 13 states have internal predecessors, (30), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-03 02:35:46,236 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:35:46,236 INFO L93 Difference]: Finished difference Result 82 states and 116 transitions. [2022-11-03 02:35:46,236 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-11-03 02:35:46,237 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 13 states have internal predecessors, (30), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 22 [2022-11-03 02:35:46,237 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:35:46,237 INFO L225 Difference]: With dead ends: 82 [2022-11-03 02:35:46,237 INFO L226 Difference]: Without dead ends: 53 [2022-11-03 02:35:46,238 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 48 SyntacticMatches, 2 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 311 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=185, Invalid=937, Unknown=0, NotChecked=0, Total=1122 [2022-11-03 02:35:46,239 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 17 mSDsluCounter, 143 mSDsCounter, 0 mSdLazyCounter, 135 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 122 SdHoareTripleChecker+Invalid, 156 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 135 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:35:46,239 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 122 Invalid, 156 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 135 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 02:35:46,240 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2022-11-03 02:35:46,247 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 45. [2022-11-03 02:35:46,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 37 states have (on average 1.2702702702702702) internal successors, (47), 38 states have internal predecessors, (47), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2022-11-03 02:35:46,248 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 57 transitions. [2022-11-03 02:35:46,248 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 57 transitions. Word has length 22 [2022-11-03 02:35:46,248 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:35:46,248 INFO L495 AbstractCegarLoop]: Abstraction has 45 states and 57 transitions. [2022-11-03 02:35:46,249 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 13 states have internal predecessors, (30), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-03 02:35:46,249 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 57 transitions. [2022-11-03 02:35:46,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-11-03 02:35:46,250 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:35:46,250 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:35:46,284 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-03 02:35:46,476 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2022-11-03 02:35:46,476 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:35:46,477 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:35:46,477 INFO L85 PathProgramCache]: Analyzing trace with hash -269831507, now seen corresponding path program 3 times [2022-11-03 02:35:46,477 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:35:46,477 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1964166507] [2022-11-03 02:35:46,477 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:35:46,478 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:35:46,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:35:46,632 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 2 proven. 15 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-03 02:35:46,632 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:35:46,633 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1964166507] [2022-11-03 02:35:46,633 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1964166507] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:35:46,633 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [575750679] [2022-11-03 02:35:46,633 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 02:35:46,633 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:35:46,633 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:35:46,634 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:35:46,646 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-03 02:35:46,711 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 02:35:46,712 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:35:46,713 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 7 conjunts are in the unsatisfiable core [2022-11-03 02:35:46,714 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:35:46,732 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-11-03 02:35:46,733 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:35:46,836 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 2 proven. 15 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-03 02:35:46,836 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [575750679] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:35:46,836 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1154670503] [2022-11-03 02:35:46,839 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-03 02:35:46,839 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:35:46,840 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:35:46,840 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:35:46,840 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:35:46,856 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:35:46,868 INFO L356 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-03 02:35:46,868 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2022-11-03 02:35:46,880 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:35:46,895 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:35:46,895 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-03 02:35:46,912 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:35:46,913 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-03 02:35:46,959 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:35:46,960 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 02:35:46,983 INFO L356 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-03 02:35:46,984 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 192 treesize of output 191 [2022-11-03 02:35:47,057 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:35:47,094 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:35:47,096 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 26 [2022-11-03 02:35:47,452 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 16 for LOIs [2022-11-03 02:35:47,466 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:35:47,913 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1515#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:35:47,913 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:35:47,914 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:35:47,914 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 8] total 15 [2022-11-03 02:35:47,914 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2046761232] [2022-11-03 02:35:47,914 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:35:47,914 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-11-03 02:35:47,915 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:35:47,915 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-11-03 02:35:47,915 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=456, Unknown=0, NotChecked=0, Total=600 [2022-11-03 02:35:47,916 INFO L87 Difference]: Start difference. First operand 45 states and 57 transitions. Second operand has 15 states, 15 states have (on average 2.0) internal successors, (30), 15 states have internal predecessors, (30), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-03 02:35:47,976 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:35:47,976 INFO L93 Difference]: Finished difference Result 90 states and 120 transitions. [2022-11-03 02:35:47,976 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-11-03 02:35:47,977 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.0) internal successors, (30), 15 states have internal predecessors, (30), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 26 [2022-11-03 02:35:47,977 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:35:47,977 INFO L225 Difference]: With dead ends: 90 [2022-11-03 02:35:47,977 INFO L226 Difference]: Without dead ends: 52 [2022-11-03 02:35:47,978 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 59 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 261 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=144, Invalid=456, Unknown=0, NotChecked=0, Total=600 [2022-11-03 02:35:47,978 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 0 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 56 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-03 02:35:47,979 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 51 Invalid, 56 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-03 02:35:47,979 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2022-11-03 02:35:47,987 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2022-11-03 02:35:47,987 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 44 states have (on average 1.2272727272727273) internal successors, (54), 45 states have internal predecessors, (54), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2022-11-03 02:35:47,988 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 64 transitions. [2022-11-03 02:35:47,993 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 64 transitions. Word has length 26 [2022-11-03 02:35:47,993 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:35:47,993 INFO L495 AbstractCegarLoop]: Abstraction has 52 states and 64 transitions. [2022-11-03 02:35:47,994 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 2.0) internal successors, (30), 15 states have internal predecessors, (30), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-03 02:35:47,994 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 64 transitions. [2022-11-03 02:35:47,994 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-11-03 02:35:47,995 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:35:47,995 INFO L195 NwaCegarLoop]: trace histogram [12, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:35:48,024 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-03 02:35:48,212 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:35:48,212 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:35:48,213 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:35:48,213 INFO L85 PathProgramCache]: Analyzing trace with hash -237978588, now seen corresponding path program 4 times [2022-11-03 02:35:48,213 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:35:48,213 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1963387098] [2022-11-03 02:35:48,213 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:35:48,213 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:35:48,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:35:48,478 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 2 proven. 78 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-03 02:35:48,478 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:35:48,479 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1963387098] [2022-11-03 02:35:48,479 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1963387098] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:35:48,479 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [27027354] [2022-11-03 02:35:48,479 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 02:35:48,479 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:35:48,479 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:35:48,480 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:35:48,502 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-03 02:35:48,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:35:48,585 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-03 02:35:48,590 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:35:48,624 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-11-03 02:35:48,624 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:35:48,907 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 2 proven. 78 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-03 02:35:48,908 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [27027354] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:35:48,909 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [536527885] [2022-11-03 02:35:48,910 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-03 02:35:48,912 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:35:48,912 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:35:48,912 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:35:48,913 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:35:48,925 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:35:48,944 INFO L356 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-03 02:35:48,945 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2022-11-03 02:35:48,960 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:35:48,976 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:35:48,976 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-03 02:35:49,011 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:35:49,013 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-03 02:35:49,078 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:35:49,079 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 02:35:49,104 INFO L356 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-03 02:35:49,104 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 192 treesize of output 191 [2022-11-03 02:35:49,206 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:35:49,256 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:35:49,258 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 26 [2022-11-03 02:35:49,584 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 16 for LOIs [2022-11-03 02:35:49,600 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:35:50,032 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1992#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:35:50,032 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:35:50,032 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:35:50,032 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 15] total 29 [2022-11-03 02:35:50,032 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1706140012] [2022-11-03 02:35:50,033 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:35:50,033 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-11-03 02:35:50,033 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:35:50,034 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-11-03 02:35:50,034 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=445, Invalid=1037, Unknown=0, NotChecked=0, Total=1482 [2022-11-03 02:35:50,035 INFO L87 Difference]: Start difference. First operand 52 states and 64 transitions. Second operand has 29 states, 29 states have (on average 1.5172413793103448) internal successors, (44), 29 states have internal predecessors, (44), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-03 02:35:50,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:35:50,145 INFO L93 Difference]: Finished difference Result 104 states and 141 transitions. [2022-11-03 02:35:50,145 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-11-03 02:35:50,146 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.5172413793103448) internal successors, (44), 29 states have internal predecessors, (44), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 33 [2022-11-03 02:35:50,146 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:35:50,148 INFO L225 Difference]: With dead ends: 104 [2022-11-03 02:35:50,148 INFO L226 Difference]: Without dead ends: 66 [2022-11-03 02:35:50,151 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 73 SyntacticMatches, 2 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 541 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=445, Invalid=1037, Unknown=0, NotChecked=0, Total=1482 [2022-11-03 02:35:50,152 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 0 mSDsluCounter, 135 mSDsCounter, 0 mSdLazyCounter, 95 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 102 SdHoareTripleChecker+Invalid, 111 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 95 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:35:50,153 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 102 Invalid, 111 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 95 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 02:35:50,153 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2022-11-03 02:35:50,174 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 66. [2022-11-03 02:35:50,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 58 states have (on average 1.1724137931034482) internal successors, (68), 59 states have internal predecessors, (68), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2022-11-03 02:35:50,177 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 78 transitions. [2022-11-03 02:35:50,177 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 78 transitions. Word has length 33 [2022-11-03 02:35:50,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:35:50,177 INFO L495 AbstractCegarLoop]: Abstraction has 66 states and 78 transitions. [2022-11-03 02:35:50,178 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.5172413793103448) internal successors, (44), 29 states have internal predecessors, (44), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-03 02:35:50,178 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 78 transitions. [2022-11-03 02:35:50,188 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-11-03 02:35:50,188 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:35:50,188 INFO L195 NwaCegarLoop]: trace histogram [26, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:35:50,229 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-03 02:35:50,402 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:35:50,402 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:35:50,402 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:35:50,403 INFO L85 PathProgramCache]: Analyzing trace with hash -2004149244, now seen corresponding path program 5 times [2022-11-03 02:35:50,403 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:35:50,403 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2119050753] [2022-11-03 02:35:50,403 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:35:50,403 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:35:50,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:35:51,315 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 2 proven. 351 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-03 02:35:51,315 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:35:51,315 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2119050753] [2022-11-03 02:35:51,316 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2119050753] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:35:51,316 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2144754619] [2022-11-03 02:35:51,316 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:35:51,316 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:35:51,316 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:35:51,319 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:35:51,340 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-03 02:35:51,421 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-03 02:35:51,421 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:35:51,422 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 7 conjunts are in the unsatisfiable core [2022-11-03 02:35:51,424 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:35:51,535 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 355 trivial. 0 not checked. [2022-11-03 02:35:51,535 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:35:51,666 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 353 trivial. 0 not checked. [2022-11-03 02:35:51,666 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2144754619] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:35:51,666 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2036417230] [2022-11-03 02:35:51,668 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-03 02:35:51,668 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:35:51,669 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:35:51,669 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:35:51,669 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:35:51,687 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:35:51,700 INFO L356 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-03 02:35:51,701 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2022-11-03 02:35:51,709 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:35:51,724 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:35:51,724 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-03 02:35:51,741 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:35:51,743 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-03 02:35:51,798 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:35:51,799 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 02:35:51,821 INFO L356 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-03 02:35:51,822 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 192 treesize of output 191 [2022-11-03 02:35:51,888 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:35:51,922 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:35:51,923 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 26 [2022-11-03 02:35:52,233 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 16 for LOIs [2022-11-03 02:35:52,245 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:35:52,864 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2621#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:35:52,865 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:35:52,865 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:35:52,865 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 8, 8] total 41 [2022-11-03 02:35:52,865 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1271305572] [2022-11-03 02:35:52,866 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:35:52,866 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2022-11-03 02:35:52,866 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:35:52,867 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2022-11-03 02:35:52,868 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=527, Invalid=2023, Unknown=0, NotChecked=0, Total=2550 [2022-11-03 02:35:52,869 INFO L87 Difference]: Start difference. First operand 66 states and 78 transitions. Second operand has 41 states, 41 states have (on average 1.4146341463414633) internal successors, (58), 41 states have internal predecessors, (58), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-03 02:35:54,055 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:35:54,055 INFO L93 Difference]: Finished difference Result 122 states and 161 transitions. [2022-11-03 02:35:54,056 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2022-11-03 02:35:54,056 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.4146341463414633) internal successors, (58), 41 states have internal predecessors, (58), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 47 [2022-11-03 02:35:54,056 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:35:54,057 INFO L225 Difference]: With dead ends: 122 [2022-11-03 02:35:54,057 INFO L226 Difference]: Without dead ends: 84 [2022-11-03 02:35:54,061 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 117 SyntacticMatches, 2 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2121 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1584, Invalid=6972, Unknown=0, NotChecked=0, Total=8556 [2022-11-03 02:35:54,061 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 24 mSDsluCounter, 221 mSDsCounter, 0 mSdLazyCounter, 230 mSolverCounterSat, 95 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 173 SdHoareTripleChecker+Invalid, 325 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 95 IncrementalHoareTripleChecker+Valid, 230 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 02:35:54,062 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [27 Valid, 173 Invalid, 325 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [95 Valid, 230 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 02:35:54,062 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2022-11-03 02:35:54,078 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 76. [2022-11-03 02:35:54,078 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 68 states have (on average 1.1470588235294117) internal successors, (78), 69 states have internal predecessors, (78), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2022-11-03 02:35:54,079 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 88 transitions. [2022-11-03 02:35:54,080 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 88 transitions. Word has length 47 [2022-11-03 02:35:54,080 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:35:54,080 INFO L495 AbstractCegarLoop]: Abstraction has 76 states and 88 transitions. [2022-11-03 02:35:54,080 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 1.4146341463414633) internal successors, (58), 41 states have internal predecessors, (58), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-03 02:35:54,081 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 88 transitions. [2022-11-03 02:35:54,082 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2022-11-03 02:35:54,082 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:35:54,082 INFO L195 NwaCegarLoop]: trace histogram [27, 10, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:35:54,121 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-03 02:35:54,308 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:35:54,309 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:35:54,309 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:35:54,309 INFO L85 PathProgramCache]: Analyzing trace with hash -787080179, now seen corresponding path program 6 times [2022-11-03 02:35:54,309 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:35:54,309 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1654907234] [2022-11-03 02:35:54,309 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:35:54,310 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:35:54,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:35:55,205 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 2 proven. 378 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2022-11-03 02:35:55,206 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:35:55,206 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1654907234] [2022-11-03 02:35:55,206 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1654907234] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:35:55,206 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1265505033] [2022-11-03 02:35:55,206 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 02:35:55,206 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:35:55,206 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:35:55,209 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:35:55,210 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-03 02:35:55,333 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 02:35:55,334 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:35:55,336 INFO L263 TraceCheckSpWp]: Trace formula consists of 370 conjuncts, 29 conjunts are in the unsatisfiable core [2022-11-03 02:35:55,339 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:35:55,392 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 59 trivial. 0 not checked. [2022-11-03 02:35:55,393 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:35:56,497 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 2 proven. 378 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2022-11-03 02:35:56,498 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1265505033] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:35:56,498 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [434520859] [2022-11-03 02:35:56,499 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-03 02:35:56,499 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:35:56,500 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:35:56,500 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:35:56,500 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:35:56,510 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:35:56,526 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:35:56,526 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-03 02:35:56,534 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:35:56,535 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2022-11-03 02:35:56,551 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:35:56,552 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-03 02:35:56,591 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:35:56,592 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 02:35:56,615 INFO L356 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-03 02:35:56,616 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 192 treesize of output 191 [2022-11-03 02:35:56,677 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:35:56,720 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:35:56,721 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 26 [2022-11-03 02:35:56,987 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 16 for LOIs [2022-11-03 02:35:56,998 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:35:57,542 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3448#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:35:57,542 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:35:57,543 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:35:57,543 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29, 30] total 59 [2022-11-03 02:35:57,543 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1123911617] [2022-11-03 02:35:57,543 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:35:57,545 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2022-11-03 02:35:57,545 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:35:57,546 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2022-11-03 02:35:57,548 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1750, Invalid=2942, Unknown=0, NotChecked=0, Total=4692 [2022-11-03 02:35:57,548 INFO L87 Difference]: Start difference. First operand 76 states and 88 transitions. Second operand has 59 states, 59 states have (on average 1.2542372881355932) internal successors, (74), 59 states have internal predecessors, (74), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-03 02:35:57,681 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:35:57,681 INFO L93 Difference]: Finished difference Result 152 states and 204 transitions. [2022-11-03 02:35:57,681 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2022-11-03 02:35:57,682 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 1.2542372881355932) internal successors, (74), 59 states have internal predecessors, (74), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 54 [2022-11-03 02:35:57,682 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:35:57,683 INFO L225 Difference]: With dead ends: 152 [2022-11-03 02:35:57,683 INFO L226 Difference]: Without dead ends: 105 [2022-11-03 02:35:57,685 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 121 SyntacticMatches, 2 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1141 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1750, Invalid=2942, Unknown=0, NotChecked=0, Total=4692 [2022-11-03 02:35:57,686 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 0 mSDsluCounter, 135 mSDsCounter, 0 mSdLazyCounter, 125 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 102 SdHoareTripleChecker+Invalid, 158 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 125 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:35:57,687 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 102 Invalid, 158 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 125 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 02:35:57,688 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2022-11-03 02:35:57,711 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 105. [2022-11-03 02:35:57,716 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 105 states, 97 states have (on average 1.1030927835051547) internal successors, (107), 98 states have internal predecessors, (107), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2022-11-03 02:35:57,718 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 117 transitions. [2022-11-03 02:35:57,718 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 117 transitions. Word has length 54 [2022-11-03 02:35:57,718 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:35:57,718 INFO L495 AbstractCegarLoop]: Abstraction has 105 states and 117 transitions. [2022-11-03 02:35:57,719 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 59 states, 59 states have (on average 1.2542372881355932) internal successors, (74), 59 states have internal predecessors, (74), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-03 02:35:57,719 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 117 transitions. [2022-11-03 02:35:57,721 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2022-11-03 02:35:57,721 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:35:57,722 INFO L195 NwaCegarLoop]: trace histogram [56, 10, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:35:57,758 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-03 02:35:57,936 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-11-03 02:35:57,936 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:35:57,937 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:35:57,937 INFO L85 PathProgramCache]: Analyzing trace with hash -1753325212, now seen corresponding path program 7 times [2022-11-03 02:35:57,937 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:35:57,937 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [931044045] [2022-11-03 02:35:57,937 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:35:57,937 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:35:58,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:36:00,747 INFO L134 CoverageAnalysis]: Checked inductivity of 1655 backedges. 2 proven. 1596 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2022-11-03 02:36:00,747 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:36:00,747 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [931044045] [2022-11-03 02:36:00,748 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [931044045] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:36:00,748 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [782126993] [2022-11-03 02:36:00,748 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 02:36:00,748 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:36:00,748 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:36:00,749 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:36:00,784 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-03 02:36:00,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:36:00,955 INFO L263 TraceCheckSpWp]: Trace formula consists of 631 conjuncts, 58 conjunts are in the unsatisfiable core [2022-11-03 02:36:00,963 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:36:01,083 INFO L134 CoverageAnalysis]: Checked inductivity of 1655 backedges. 0 proven. 1596 refuted. 0 times theorem prover too weak. 59 trivial. 0 not checked. [2022-11-03 02:36:01,083 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:36:05,055 INFO L134 CoverageAnalysis]: Checked inductivity of 1655 backedges. 2 proven. 1596 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2022-11-03 02:36:05,056 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [782126993] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:36:05,056 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [906008415] [2022-11-03 02:36:05,057 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-03 02:36:05,058 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:36:05,058 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:36:05,058 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:36:05,058 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:36:05,068 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:36:05,080 INFO L356 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-03 02:36:05,081 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2022-11-03 02:36:05,089 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:36:05,106 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:36:05,107 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-03 02:36:05,125 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:36:05,126 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-03 02:36:05,170 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:36:05,171 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 02:36:05,193 INFO L356 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-03 02:36:05,194 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 192 treesize of output 191 [2022-11-03 02:36:05,253 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:36:05,286 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:36:05,290 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 26 [2022-11-03 02:36:05,569 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 16 for LOIs [2022-11-03 02:36:05,580 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:36:06,348 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4543#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:36:06,348 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:36:06,349 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:36:06,349 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 58, 59] total 117 [2022-11-03 02:36:06,349 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [51107244] [2022-11-03 02:36:06,349 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:36:06,350 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 117 states [2022-11-03 02:36:06,350 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:36:06,352 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 117 interpolants. [2022-11-03 02:36:06,356 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6825, Invalid=9177, Unknown=0, NotChecked=0, Total=16002 [2022-11-03 02:36:06,357 INFO L87 Difference]: Start difference. First operand 105 states and 117 transitions. Second operand has 117 states, 117 states have (on average 1.1282051282051282) internal successors, (132), 117 states have internal predecessors, (132), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-03 02:36:06,657 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:36:06,657 INFO L93 Difference]: Finished difference Result 210 states and 291 transitions. [2022-11-03 02:36:06,658 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 116 states. [2022-11-03 02:36:06,658 INFO L78 Accepts]: Start accepts. Automaton has has 117 states, 117 states have (on average 1.1282051282051282) internal successors, (132), 117 states have internal predecessors, (132), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 83 [2022-11-03 02:36:06,661 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:36:06,662 INFO L225 Difference]: With dead ends: 210 [2022-11-03 02:36:06,662 INFO L226 Difference]: Without dead ends: 163 [2022-11-03 02:36:06,666 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 306 GetRequests, 179 SyntacticMatches, 2 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2301 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=6825, Invalid=9177, Unknown=0, NotChecked=0, Total=16002 [2022-11-03 02:36:06,668 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 0 mSDsluCounter, 216 mSDsCounter, 0 mSdLazyCounter, 215 mSolverCounterSat, 60 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 153 SdHoareTripleChecker+Invalid, 275 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 60 IncrementalHoareTripleChecker+Valid, 215 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 02:36:06,668 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 153 Invalid, 275 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [60 Valid, 215 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 02:36:06,669 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2022-11-03 02:36:06,693 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 163. [2022-11-03 02:36:06,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 163 states, 155 states have (on average 1.064516129032258) internal successors, (165), 156 states have internal predecessors, (165), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2022-11-03 02:36:06,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 163 states to 163 states and 175 transitions. [2022-11-03 02:36:06,696 INFO L78 Accepts]: Start accepts. Automaton has 163 states and 175 transitions. Word has length 83 [2022-11-03 02:36:06,697 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:36:06,698 INFO L495 AbstractCegarLoop]: Abstraction has 163 states and 175 transitions. [2022-11-03 02:36:06,698 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 117 states, 117 states have (on average 1.1282051282051282) internal successors, (132), 117 states have internal predecessors, (132), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-03 02:36:06,698 INFO L276 IsEmpty]: Start isEmpty. Operand 163 states and 175 transitions. [2022-11-03 02:36:06,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2022-11-03 02:36:06,700 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:36:06,700 INFO L195 NwaCegarLoop]: trace histogram [114, 10, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:36:06,732 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-03 02:36:06,908 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-11-03 02:36:06,908 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:36:06,909 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:36:06,909 INFO L85 PathProgramCache]: Analyzing trace with hash 828844548, now seen corresponding path program 8 times [2022-11-03 02:36:06,909 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:36:06,909 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [612818001] [2022-11-03 02:36:06,910 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:36:06,910 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:36:07,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:36:16,207 INFO L134 CoverageAnalysis]: Checked inductivity of 6614 backedges. 2 proven. 6555 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2022-11-03 02:36:16,208 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:36:16,208 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [612818001] [2022-11-03 02:36:16,208 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [612818001] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:36:16,208 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1746974048] [2022-11-03 02:36:16,208 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:36:16,208 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:36:16,208 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:36:16,209 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:36:16,213 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-03 02:36:16,494 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-11-03 02:36:16,494 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:36:16,497 INFO L263 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 13 conjunts are in the unsatisfiable core [2022-11-03 02:36:16,499 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:36:17,132 INFO L134 CoverageAnalysis]: Checked inductivity of 6614 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 6559 trivial. 0 not checked. [2022-11-03 02:36:17,133 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:36:17,865 INFO L134 CoverageAnalysis]: Checked inductivity of 6614 backedges. 2 proven. 55 refuted. 0 times theorem prover too weak. 6557 trivial. 0 not checked. [2022-11-03 02:36:17,866 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1746974048] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:36:17,866 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [582475434] [2022-11-03 02:36:17,868 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-03 02:36:17,868 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:36:17,868 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:36:17,869 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:36:17,869 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:36:17,888 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:36:17,900 INFO L356 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-03 02:36:17,900 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2022-11-03 02:36:17,906 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:36:17,920 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:36:17,920 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-03 02:36:17,945 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:36:17,946 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-03 02:36:17,987 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:36:17,988 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 02:36:18,011 INFO L356 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-03 02:36:18,011 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 192 treesize of output 191 [2022-11-03 02:36:18,075 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:36:18,108 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:36:18,110 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 26 [2022-11-03 02:36:18,426 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 16 for LOIs [2022-11-03 02:36:18,437 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:36:19,809 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6242#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:36:19,809 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:36:19,809 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:36:19,809 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [117, 14, 14] total 141 [2022-11-03 02:36:19,810 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [808940434] [2022-11-03 02:36:19,810 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:36:19,810 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 141 states [2022-11-03 02:36:19,811 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:36:19,813 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 141 interpolants. [2022-11-03 02:36:19,818 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7117, Invalid=15533, Unknown=0, NotChecked=0, Total=22650 [2022-11-03 02:36:19,818 INFO L87 Difference]: Start difference. First operand 163 states and 175 transitions. Second operand has 141 states, 141 states have (on average 1.1205673758865249) internal successors, (158), 141 states have internal predecessors, (158), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-03 02:36:29,126 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:36:29,126 INFO L93 Difference]: Finished difference Result 237 states and 285 transitions. [2022-11-03 02:36:29,126 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 152 states. [2022-11-03 02:36:29,127 INFO L78 Accepts]: Start accepts. Automaton has has 141 states, 141 states have (on average 1.1205673758865249) internal successors, (158), 141 states have internal predecessors, (158), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 141 [2022-11-03 02:36:29,127 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:36:29,128 INFO L225 Difference]: With dead ends: 237 [2022-11-03 02:36:29,129 INFO L226 Difference]: Without dead ends: 190 [2022-11-03 02:36:29,139 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 686 GetRequests, 387 SyntacticMatches, 2 SemanticMatches, 297 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17720 ImplicationChecksByTransitivity, 16.5s TimeCoverageRelationStatistics Valid=21715, Invalid=67387, Unknown=0, NotChecked=0, Total=89102 [2022-11-03 02:36:29,140 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 24 mSDsluCounter, 190 mSDsCounter, 0 mSdLazyCounter, 308 mSolverCounterSat, 312 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 157 SdHoareTripleChecker+Invalid, 620 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 312 IncrementalHoareTripleChecker+Valid, 308 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-03 02:36:29,140 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [27 Valid, 157 Invalid, 620 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [312 Valid, 308 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-03 02:36:29,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2022-11-03 02:36:29,161 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 182. [2022-11-03 02:36:29,162 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 182 states, 174 states have (on average 1.0574712643678161) internal successors, (184), 175 states have internal predecessors, (184), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2022-11-03 02:36:29,163 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 182 states to 182 states and 194 transitions. [2022-11-03 02:36:29,163 INFO L78 Accepts]: Start accepts. Automaton has 182 states and 194 transitions. Word has length 141 [2022-11-03 02:36:29,164 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:36:29,164 INFO L495 AbstractCegarLoop]: Abstraction has 182 states and 194 transitions. [2022-11-03 02:36:29,165 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 141 states, 141 states have (on average 1.1205673758865249) internal successors, (158), 141 states have internal predecessors, (158), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-03 02:36:29,165 INFO L276 IsEmpty]: Start isEmpty. Operand 182 states and 194 transitions. [2022-11-03 02:36:29,166 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 155 [2022-11-03 02:36:29,166 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:36:29,167 INFO L195 NwaCegarLoop]: trace histogram [115, 22, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:36:29,207 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-03 02:36:29,392 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:36:29,392 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:36:29,393 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:36:29,393 INFO L85 PathProgramCache]: Analyzing trace with hash -2001117683, now seen corresponding path program 9 times [2022-11-03 02:36:29,393 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:36:29,393 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2097359322] [2022-11-03 02:36:29,393 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:36:29,393 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:36:29,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:36:38,644 INFO L134 CoverageAnalysis]: Checked inductivity of 6927 backedges. 2 proven. 6670 refuted. 0 times theorem prover too weak. 255 trivial. 0 not checked. [2022-11-03 02:36:38,644 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:36:38,644 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2097359322] [2022-11-03 02:36:38,645 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2097359322] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:36:38,645 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1745380952] [2022-11-03 02:36:38,645 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 02:36:38,645 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:36:38,645 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:36:38,646 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:36:38,647 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-03 02:36:38,974 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 02:36:38,974 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:36:38,981 INFO L263 TraceCheckSpWp]: Trace formula consists of 1210 conjuncts, 117 conjunts are in the unsatisfiable core [2022-11-03 02:36:38,986 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:36:39,220 INFO L134 CoverageAnalysis]: Checked inductivity of 6927 backedges. 0 proven. 6670 refuted. 0 times theorem prover too weak. 257 trivial. 0 not checked. [2022-11-03 02:36:39,220 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:36:55,106 INFO L134 CoverageAnalysis]: Checked inductivity of 6927 backedges. 2 proven. 6670 refuted. 0 times theorem prover too weak. 255 trivial. 0 not checked. [2022-11-03 02:36:55,107 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1745380952] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:36:55,107 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2016825392] [2022-11-03 02:36:55,108 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-03 02:36:55,109 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:36:55,109 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:36:55,109 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:36:55,109 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:36:55,126 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:36:55,140 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:36:55,140 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-03 02:36:55,151 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:36:55,151 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2022-11-03 02:36:55,169 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:36:55,170 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-03 02:36:55,208 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:36:55,209 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 02:36:55,232 INFO L356 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-03 02:36:55,232 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 192 treesize of output 191 [2022-11-03 02:36:55,326 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:36:55,358 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:36:55,359 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 26 [2022-11-03 02:36:55,635 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 16 for LOIs [2022-11-03 02:36:55,646 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:36:56,865 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8499#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:36:56,866 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:36:56,866 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:36:56,866 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [118, 117, 118] total 235 [2022-11-03 02:36:56,866 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [85541916] [2022-11-03 02:36:56,866 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:36:56,867 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 235 states [2022-11-03 02:36:56,867 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:36:56,872 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 235 interpolants. [2022-11-03 02:36:56,875 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27534, Invalid=32246, Unknown=0, NotChecked=0, Total=59780 [2022-11-03 02:36:56,876 INFO L87 Difference]: Start difference. First operand 182 states and 194 transitions. Second operand has 235 states, 235 states have (on average 1.0638297872340425) internal successors, (250), 235 states have internal predecessors, (250), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-03 02:36:57,881 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:36:57,881 INFO L93 Difference]: Finished difference Result 364 states and 504 transitions. [2022-11-03 02:36:57,882 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 234 states. [2022-11-03 02:36:57,882 INFO L78 Accepts]: Start accepts. Automaton has has 235 states, 235 states have (on average 1.0638297872340425) internal successors, (250), 235 states have internal predecessors, (250), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 154 [2022-11-03 02:36:57,883 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:36:57,884 INFO L225 Difference]: With dead ends: 364 [2022-11-03 02:36:57,884 INFO L226 Difference]: Without dead ends: 299 [2022-11-03 02:36:57,891 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 578 GetRequests, 333 SyntacticMatches, 2 SemanticMatches, 243 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4661 ImplicationChecksByTransitivity, 22.1s TimeCoverageRelationStatistics Valid=27534, Invalid=32246, Unknown=0, NotChecked=0, Total=59780 [2022-11-03 02:36:57,892 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 0 mSDsluCounter, 108 mSDsCounter, 0 mSdLazyCounter, 290 mSolverCounterSat, 121 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 85 SdHoareTripleChecker+Invalid, 411 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 121 IncrementalHoareTripleChecker+Valid, 290 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-03 02:36:57,892 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 85 Invalid, 411 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [121 Valid, 290 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-03 02:36:57,893 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 299 states. [2022-11-03 02:36:57,925 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 299 to 299. [2022-11-03 02:36:57,926 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 299 states, 291 states have (on average 1.034364261168385) internal successors, (301), 292 states have internal predecessors, (301), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2022-11-03 02:36:57,928 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 299 states to 299 states and 311 transitions. [2022-11-03 02:36:57,928 INFO L78 Accepts]: Start accepts. Automaton has 299 states and 311 transitions. Word has length 154 [2022-11-03 02:36:57,928 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:36:57,928 INFO L495 AbstractCegarLoop]: Abstraction has 299 states and 311 transitions. [2022-11-03 02:36:57,929 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 235 states, 235 states have (on average 1.0638297872340425) internal successors, (250), 235 states have internal predecessors, (250), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-03 02:36:57,929 INFO L276 IsEmpty]: Start isEmpty. Operand 299 states and 311 transitions. [2022-11-03 02:36:57,933 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 272 [2022-11-03 02:36:57,933 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:36:57,933 INFO L195 NwaCegarLoop]: trace histogram [232, 22, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:36:57,959 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-03 02:36:58,136 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:36:58,136 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:36:58,137 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:36:58,137 INFO L85 PathProgramCache]: Analyzing trace with hash 726256996, now seen corresponding path program 10 times [2022-11-03 02:36:58,137 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:36:58,137 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [562406888] [2022-11-03 02:36:58,137 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:36:58,137 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:36:58,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:37:30,019 INFO L134 CoverageAnalysis]: Checked inductivity of 27285 backedges. 2 proven. 27028 refuted. 0 times theorem prover too weak. 255 trivial. 0 not checked. [2022-11-03 02:37:30,019 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:37:30,019 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [562406888] [2022-11-03 02:37:30,019 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [562406888] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:37:30,020 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [841152828] [2022-11-03 02:37:30,020 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 02:37:30,020 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:37:30,020 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:37:30,023 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:37:30,024 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-03 02:37:30,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:37:30,578 INFO L263 TraceCheckSpWp]: Trace formula consists of 2263 conjuncts, 234 conjunts are in the unsatisfiable core [2022-11-03 02:37:30,586 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:37:30,995 INFO L134 CoverageAnalysis]: Checked inductivity of 27285 backedges. 0 proven. 27028 refuted. 0 times theorem prover too weak. 257 trivial. 0 not checked. [2022-11-03 02:37:30,996 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:38:33,185 INFO L134 CoverageAnalysis]: Checked inductivity of 27285 backedges. 2 proven. 27028 refuted. 0 times theorem prover too weak. 255 trivial. 0 not checked. [2022-11-03 02:38:33,186 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [841152828] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:38:33,186 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2038482851] [2022-11-03 02:38:33,188 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-03 02:38:33,188 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:38:33,188 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:38:33,189 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:38:33,189 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:38:33,200 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:38:33,214 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:38:33,214 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-03 02:38:33,222 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:38:33,223 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2022-11-03 02:38:33,237 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:38:33,238 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-03 02:38:33,274 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:38:33,277 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:38:33,289 INFO L356 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-03 02:38:33,290 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 202 treesize of output 190 [2022-11-03 02:38:33,324 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:38:33,354 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:38:33,355 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 26 [2022-11-03 02:38:33,618 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 16 for LOIs [2022-11-03 02:38:33,629 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:38:35,784 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11886#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:38:35,784 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:38:35,784 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:38:35,784 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [235, 234, 235] total 469 [2022-11-03 02:38:35,785 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1531180658] [2022-11-03 02:38:35,785 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:38:35,786 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 469 states [2022-11-03 02:38:35,786 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:38:35,800 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 469 interpolants. [2022-11-03 02:38:35,817 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=109785, Invalid=119177, Unknown=0, NotChecked=0, Total=228962 [2022-11-03 02:38:35,818 INFO L87 Difference]: Start difference. First operand 299 states and 311 transitions. Second operand has 469 states, 469 states have (on average 1.0319829424307037) internal successors, (484), 469 states have internal predecessors, (484), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-03 02:38:39,598 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:38:39,599 INFO L93 Difference]: Finished difference Result 598 states and 855 transitions. [2022-11-03 02:38:39,599 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 468 states. [2022-11-03 02:38:39,600 INFO L78 Accepts]: Start accepts. Automaton has has 469 states, 469 states have (on average 1.0319829424307037) internal successors, (484), 469 states have internal predecessors, (484), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 271 [2022-11-03 02:38:39,601 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:38:39,603 INFO L225 Difference]: With dead ends: 598 [2022-11-03 02:38:39,603 INFO L226 Difference]: Without dead ends: 533 [2022-11-03 02:38:39,615 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1046 GetRequests, 567 SyntacticMatches, 2 SemanticMatches, 477 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9341 ImplicationChecksByTransitivity, 84.7s TimeCoverageRelationStatistics Valid=109785, Invalid=119177, Unknown=0, NotChecked=0, Total=228962 [2022-11-03 02:38:39,616 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 0 mSDsluCounter, 162 mSDsCounter, 0 mSdLazyCounter, 546 mSolverCounterSat, 240 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 119 SdHoareTripleChecker+Invalid, 786 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 240 IncrementalHoareTripleChecker+Valid, 546 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-03 02:38:39,616 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 119 Invalid, 786 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [240 Valid, 546 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-03 02:38:39,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 533 states. [2022-11-03 02:38:39,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 533 to 533. [2022-11-03 02:38:39,669 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 533 states, 525 states have (on average 1.019047619047619) internal successors, (535), 526 states have internal predecessors, (535), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2022-11-03 02:38:39,671 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 533 states to 533 states and 545 transitions. [2022-11-03 02:38:39,671 INFO L78 Accepts]: Start accepts. Automaton has 533 states and 545 transitions. Word has length 271 [2022-11-03 02:38:39,672 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:38:39,672 INFO L495 AbstractCegarLoop]: Abstraction has 533 states and 545 transitions. [2022-11-03 02:38:39,673 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 469 states, 469 states have (on average 1.0319829424307037) internal successors, (484), 469 states have internal predecessors, (484), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-03 02:38:39,673 INFO L276 IsEmpty]: Start isEmpty. Operand 533 states and 545 transitions. [2022-11-03 02:38:39,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 506 [2022-11-03 02:38:39,684 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:38:39,684 INFO L195 NwaCegarLoop]: trace histogram [466, 22, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:38:39,719 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-11-03 02:38:39,908 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-11-03 02:38:39,908 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:38:39,909 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:38:39,909 INFO L85 PathProgramCache]: Analyzing trace with hash 1184737540, now seen corresponding path program 11 times [2022-11-03 02:38:39,909 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:38:39,909 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1836269778] [2022-11-03 02:38:39,909 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:38:39,909 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:38:41,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:40:52,116 INFO L134 CoverageAnalysis]: Checked inductivity of 109068 backedges. 2 proven. 108811 refuted. 0 times theorem prover too weak. 255 trivial. 0 not checked. [2022-11-03 02:40:52,116 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:40:52,116 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1836269778] [2022-11-03 02:40:52,117 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1836269778] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:40:52,117 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1303830041] [2022-11-03 02:40:52,117 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:40:52,117 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:40:52,117 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:40:52,118 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:40:52,119 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-03 02:40:53,960 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2022-11-03 02:40:53,961 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:40:53,968 INFO L263 TraceCheckSpWp]: Trace formula consists of 373 conjuncts, 25 conjunts are in the unsatisfiable core [2022-11-03 02:40:53,977 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:40:58,657 INFO L134 CoverageAnalysis]: Checked inductivity of 109068 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 108815 trivial. 0 not checked. [2022-11-03 02:40:58,657 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:41:03,769 INFO L134 CoverageAnalysis]: Checked inductivity of 109068 backedges. 2 proven. 253 refuted. 0 times theorem prover too weak. 108813 trivial. 0 not checked. [2022-11-03 02:41:03,769 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1303830041] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:41:03,770 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1727712388] [2022-11-03 02:41:03,771 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-03 02:41:03,772 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:41:03,772 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:41:03,772 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:41:03,772 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:41:03,783 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:41:03,794 INFO L356 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-03 02:41:03,794 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2022-11-03 02:41:03,802 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:41:03,816 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-03 02:41:03,816 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-03 02:41:03,830 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:41:03,831 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-03 02:41:03,868 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:41:03,871 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:41:03,883 INFO L356 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-03 02:41:03,884 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 202 treesize of output 190 [2022-11-03 02:41:03,917 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 02:41:03,946 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:41:03,949 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 26 [2022-11-03 02:41:04,201 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 16 for LOIs [2022-11-03 02:41:04,212 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:41:08,521 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '17661#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:41:08,521 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:41:08,521 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:41:08,522 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [469, 26, 26] total 517 [2022-11-03 02:41:08,522 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1151575238] [2022-11-03 02:41:08,522 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:41:08,523 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 517 states [2022-11-03 02:41:08,523 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:41:08,538 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 517 interpolants. [2022-11-03 02:41:08,554 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=110929, Invalid=166273, Unknown=0, NotChecked=0, Total=277202 [2022-11-03 02:41:08,555 INFO L87 Difference]: Start difference. First operand 533 states and 545 transitions. Second operand has 517 states, 517 states have (on average 1.0328820116054158) internal successors, (534), 517 states have internal predecessors, (534), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-03 02:43:09,740 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:43:09,740 INFO L93 Difference]: Finished difference Result 643 states and 709 transitions. [2022-11-03 02:43:09,741 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 540 states. [2022-11-03 02:43:09,742 INFO L78 Accepts]: Start accepts. Automaton has has 517 states, 517 states have (on average 1.0328820116054158) internal successors, (534), 517 states have internal predecessors, (534), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 505 [2022-11-03 02:43:09,743 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:43:09,748 INFO L225 Difference]: With dead ends: 643 [2022-11-03 02:43:09,748 INFO L226 Difference]: Without dead ends: 578 [2022-11-03 02:43:09,923 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2518 GetRequests, 1455 SyntacticMatches, 2 SemanticMatches, 1061 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 186770 ImplicationChecksByTransitivity, 212.2s TimeCoverageRelationStatistics Valid=334589, Invalid=794317, Unknown=0, NotChecked=0, Total=1128906 [2022-11-03 02:43:09,924 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 17 mSDsluCounter, 259 mSDsCounter, 0 mSdLazyCounter, 730 mSolverCounterSat, 580 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 202 SdHoareTripleChecker+Invalid, 1310 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 580 IncrementalHoareTripleChecker+Valid, 730 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:43:09,925 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 202 Invalid, 1310 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [580 Valid, 730 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-11-03 02:43:09,926 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 578 states. [2022-11-03 02:43:10,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 578 to 570. [2022-11-03 02:43:10,023 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 570 states, 562 states have (on average 1.0177935943060499) internal successors, (572), 563 states have internal predecessors, (572), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2022-11-03 02:43:10,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 570 states to 570 states and 582 transitions. [2022-11-03 02:43:10,026 INFO L78 Accepts]: Start accepts. Automaton has 570 states and 582 transitions. Word has length 505 [2022-11-03 02:43:10,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:43:10,028 INFO L495 AbstractCegarLoop]: Abstraction has 570 states and 582 transitions. [2022-11-03 02:43:10,028 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 517 states, 517 states have (on average 1.0328820116054158) internal successors, (534), 517 states have internal predecessors, (534), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-03 02:43:10,029 INFO L276 IsEmpty]: Start isEmpty. Operand 570 states and 582 transitions. [2022-11-03 02:43:10,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 531 [2022-11-03 02:43:10,044 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:43:10,044 INFO L195 NwaCegarLoop]: trace histogram [467, 46, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:43:10,088 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-11-03 02:43:10,271 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-11-03 02:43:10,271 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:43:10,272 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:43:10,272 INFO L85 PathProgramCache]: Analyzing trace with hash 704626445, now seen corresponding path program 12 times [2022-11-03 02:43:10,272 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:43:10,272 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [97972764] [2022-11-03 02:43:10,272 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:43:10,272 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:43:11,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:45:26,855 INFO L134 CoverageAnalysis]: Checked inductivity of 110363 backedges. 2 proven. 109278 refuted. 0 times theorem prover too weak. 1083 trivial. 0 not checked. [2022-11-03 02:45:26,856 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:45:26,856 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [97972764] [2022-11-03 02:45:26,856 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [97972764] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:45:26,857 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1713751905] [2022-11-03 02:45:26,857 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 02:45:26,857 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:45:26,857 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:45:26,859 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:45:26,860 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fa204592-ef98-4465-80f5-7c646218373a/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-03 02:45:28,031 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 02:45:28,031 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:45:28,065 INFO L263 TraceCheckSpWp]: Trace formula consists of 4474 conjuncts, 469 conjunts are in the unsatisfiable core [2022-11-03 02:45:28,083 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:45:28,888 INFO L134 CoverageAnalysis]: Checked inductivity of 110363 backedges. 0 proven. 109278 refuted. 0 times theorem prover too weak. 1085 trivial. 0 not checked. [2022-11-03 02:45:28,888 INFO L328 TraceCheckSpWp]: Computing backward predicates...