./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-invgen/fragtest_simple.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 9ad7fb26 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-invgen/fragtest_simple.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH --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 be3b53cc5f9badbf5402cafcfa5766831674eb009261bc7c1bcbe9580aece38e --- Real Ultimate output --- This is Ultimate 0.2.1-dev-9ad7fb2 [2021-11-03 04:20:27,969 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-03 04:20:27,972 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-03 04:20:28,010 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-03 04:20:28,011 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-03 04:20:28,012 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-03 04:20:28,013 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-03 04:20:28,015 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-03 04:20:28,017 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-03 04:20:28,018 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-03 04:20:28,020 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-03 04:20:28,021 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-03 04:20:28,021 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-03 04:20:28,023 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-03 04:20:28,024 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-03 04:20:28,026 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-03 04:20:28,027 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-03 04:20:28,028 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-03 04:20:28,030 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-03 04:20:28,032 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-03 04:20:28,034 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-03 04:20:28,035 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-03 04:20:28,037 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-03 04:20:28,038 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-03 04:20:28,041 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-03 04:20:28,042 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-03 04:20:28,042 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-03 04:20:28,043 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-03 04:20:28,044 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-03 04:20:28,045 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-03 04:20:28,045 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-03 04:20:28,046 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-03 04:20:28,047 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-03 04:20:28,048 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-03 04:20:28,049 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-03 04:20:28,050 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-03 04:20:28,050 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-03 04:20:28,051 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-03 04:20:28,051 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-03 04:20:28,052 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-03 04:20:28,053 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-03 04:20:28,054 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-03 04:20:28,095 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-03 04:20:28,095 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-03 04:20:28,096 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-03 04:20:28,097 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-03 04:20:28,097 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-03 04:20:28,097 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-03 04:20:28,097 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-03 04:20:28,097 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-03 04:20:28,098 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-03 04:20:28,098 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-03 04:20:28,099 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-03 04:20:28,099 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-03 04:20:28,099 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-03 04:20:28,099 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-03 04:20:28,100 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-03 04:20:28,100 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-03 04:20:28,101 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-03 04:20:28,101 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-03 04:20:28,101 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-03 04:20:28,101 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-03 04:20:28,101 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-03 04:20:28,101 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-03 04:20:28,102 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-03 04:20:28,102 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-03 04:20:28,102 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-03 04:20:28,102 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-03 04:20:28,102 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-03 04:20:28,103 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-03 04:20:28,103 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-03 04:20:28,104 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-03 04:20:28,104 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-03 04:20:28,105 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-03 04:20:28,105 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-03 04:20:28,105 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-03 04:20:28,105 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-03 04:20:28,105 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-03 04:20:28,106 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-03 04:20:28,106 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-03 04:20:28,106 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-03 04:20:28,106 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES 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_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> be3b53cc5f9badbf5402cafcfa5766831674eb009261bc7c1bcbe9580aece38e [2021-11-03 04:20:28,367 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-03 04:20:28,398 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-03 04:20:28,400 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-03 04:20:28,401 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-03 04:20:28,403 INFO L275 PluginConnector]: CDTParser initialized [2021-11-03 04:20:28,404 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/../../sv-benchmarks/c/loop-invgen/fragtest_simple.i [2021-11-03 04:20:28,481 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/data/079437a8e/983efd916d6f456e97ec0cde3d771ea3/FLAG01adaffcb [2021-11-03 04:20:28,940 INFO L306 CDTParser]: Found 1 translation units. [2021-11-03 04:20:28,941 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/sv-benchmarks/c/loop-invgen/fragtest_simple.i [2021-11-03 04:20:28,947 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/data/079437a8e/983efd916d6f456e97ec0cde3d771ea3/FLAG01adaffcb [2021-11-03 04:20:29,336 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/data/079437a8e/983efd916d6f456e97ec0cde3d771ea3 [2021-11-03 04:20:29,339 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-03 04:20:29,340 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-03 04:20:29,352 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-03 04:20:29,352 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-03 04:20:29,356 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-03 04:20:29,356 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 04:20:29" (1/1) ... [2021-11-03 04:20:29,357 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@63764c3e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:20:29, skipping insertion in model container [2021-11-03 04:20:29,358 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 04:20:29" (1/1) ... [2021-11-03 04:20:29,363 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-03 04:20:29,377 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-03 04:20:29,544 WARN L228 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_24e3d08c-5efc-4339-b877-78abe3592f66/sv-benchmarks/c/loop-invgen/fragtest_simple.i[893,906] [2021-11-03 04:20:29,553 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-03 04:20:29,559 INFO L203 MainTranslator]: Completed pre-run [2021-11-03 04:20:29,571 WARN L228 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_24e3d08c-5efc-4339-b877-78abe3592f66/sv-benchmarks/c/loop-invgen/fragtest_simple.i[893,906] [2021-11-03 04:20:29,576 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-03 04:20:29,589 INFO L208 MainTranslator]: Completed translation [2021-11-03 04:20:29,589 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:20:29 WrapperNode [2021-11-03 04:20:29,590 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-03 04:20:29,591 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-03 04:20:29,591 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-03 04:20:29,591 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-03 04:20:29,598 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:20:29" (1/1) ... [2021-11-03 04:20:29,605 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:20:29" (1/1) ... [2021-11-03 04:20:29,622 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-03 04:20:29,623 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-03 04:20:29,623 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-03 04:20:29,623 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-03 04:20:29,631 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:20:29" (1/1) ... [2021-11-03 04:20:29,631 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:20:29" (1/1) ... [2021-11-03 04:20:29,633 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:20:29" (1/1) ... [2021-11-03 04:20:29,633 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:20:29" (1/1) ... [2021-11-03 04:20:29,636 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:20:29" (1/1) ... [2021-11-03 04:20:29,640 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:20:29" (1/1) ... [2021-11-03 04:20:29,641 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:20:29" (1/1) ... [2021-11-03 04:20:29,642 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-03 04:20:29,643 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-03 04:20:29,643 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-03 04:20:29,644 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-03 04:20:29,644 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:20:29" (1/1) ... [2021-11-03 04:20:29,651 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-03 04:20:29,663 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:20:29,674 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-03 04:20:29,676 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-03 04:20:29,706 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-03 04:20:29,706 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-03 04:20:29,706 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-03 04:20:29,707 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-03 04:20:29,919 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-03 04:20:29,919 INFO L299 CfgBuilder]: Removed 9 assume(true) statements. [2021-11-03 04:20:29,921 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 04:20:29 BoogieIcfgContainer [2021-11-03 04:20:29,922 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-03 04:20:29,923 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-03 04:20:29,923 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-03 04:20:29,926 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-03 04:20:29,927 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 03.11 04:20:29" (1/3) ... [2021-11-03 04:20:29,927 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5125adb4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 04:20:29, skipping insertion in model container [2021-11-03 04:20:29,927 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:20:29" (2/3) ... [2021-11-03 04:20:29,928 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5125adb4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 04:20:29, skipping insertion in model container [2021-11-03 04:20:29,928 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 04:20:29" (3/3) ... [2021-11-03 04:20:29,929 INFO L111 eAbstractionObserver]: Analyzing ICFG fragtest_simple.i [2021-11-03 04:20:29,934 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-03 04:20:29,934 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-03 04:20:29,980 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-03 04:20:29,986 INFO L339 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, mLoopAccelerationTechnique=FAST_UPR [2021-11-03 04:20:29,986 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-03 04:20:30,000 INFO L276 IsEmpty]: Start isEmpty. Operand has 15 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 14 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:20:30,005 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-03 04:20:30,005 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:20:30,005 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:20:30,006 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:20:30,011 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:20:30,011 INFO L85 PathProgramCache]: Analyzing trace with hash 1621408492, now seen corresponding path program 1 times [2021-11-03 04:20:30,020 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:20:30,021 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1380417900] [2021-11-03 04:20:30,021 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:20:30,022 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:20:30,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:20:30,245 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:20:30,246 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:20:30,246 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1380417900] [2021-11-03 04:20:30,247 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1380417900] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 04:20:30,247 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 04:20:30,248 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-03 04:20:30,249 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1047755838] [2021-11-03 04:20:30,254 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-03 04:20:30,254 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:20:30,282 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-03 04:20:30,283 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-03 04:20:30,285 INFO L87 Difference]: Start difference. First operand has 15 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 14 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:20:30,305 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:20:30,308 INFO L93 Difference]: Finished difference Result 27 states and 37 transitions. [2021-11-03 04:20:30,308 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-03 04:20:30,310 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-11-03 04:20:30,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:20:30,319 INFO L225 Difference]: With dead ends: 27 [2021-11-03 04:20:30,319 INFO L226 Difference]: Without dead ends: 13 [2021-11-03 04:20:30,323 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-03 04:20:30,338 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2021-11-03 04:20:30,350 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2021-11-03 04:20:30,351 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.25) internal successors, (15), 12 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:20:30,353 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 15 transitions. [2021-11-03 04:20:30,354 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 15 transitions. Word has length 8 [2021-11-03 04:20:30,354 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:20:30,355 INFO L470 AbstractCegarLoop]: Abstraction has 13 states and 15 transitions. [2021-11-03 04:20:30,355 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:20:30,356 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 15 transitions. [2021-11-03 04:20:30,357 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-03 04:20:30,357 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:20:30,357 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:20:30,358 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-03 04:20:30,359 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:20:30,363 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:20:30,363 INFO L85 PathProgramCache]: Analyzing trace with hash -134467088, now seen corresponding path program 1 times [2021-11-03 04:20:30,363 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:20:30,364 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1976229795] [2021-11-03 04:20:30,364 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:20:30,364 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:20:30,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:20:30,529 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:20:30,529 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:20:30,530 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1976229795] [2021-11-03 04:20:30,531 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1976229795] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 04:20:30,531 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 04:20:30,531 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-03 04:20:30,532 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1687834118] [2021-11-03 04:20:30,534 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-03 04:20:30,534 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:20:30,536 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-03 04:20:30,537 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-03 04:20:30,537 INFO L87 Difference]: Start difference. First operand 13 states and 15 transitions. Second operand has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:20:30,584 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:20:30,585 INFO L93 Difference]: Finished difference Result 18 states and 20 transitions. [2021-11-03 04:20:30,585 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-03 04:20:30,586 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2021-11-03 04:20:30,586 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:20:30,587 INFO L225 Difference]: With dead ends: 18 [2021-11-03 04:20:30,587 INFO L226 Difference]: Without dead ends: 16 [2021-11-03 04:20:30,588 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-03 04:20:30,588 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2021-11-03 04:20:30,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2021-11-03 04:20:30,594 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 14 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:20:30,596 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2021-11-03 04:20:30,596 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 10 [2021-11-03 04:20:30,597 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:20:30,597 INFO L470 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2021-11-03 04:20:30,597 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:20:30,597 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2021-11-03 04:20:30,598 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-03 04:20:30,598 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:20:30,598 INFO L513 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:20:30,600 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-03 04:20:30,601 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:20:30,602 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:20:30,603 INFO L85 PathProgramCache]: Analyzing trace with hash 1655368611, now seen corresponding path program 1 times [2021-11-03 04:20:30,604 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:20:30,606 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1331271884] [2021-11-03 04:20:30,606 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:20:30,608 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:20:30,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:20:30,741 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:20:30,742 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:20:30,742 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1331271884] [2021-11-03 04:20:30,742 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1331271884] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 04:20:30,742 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 04:20:30,743 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-03 04:20:30,743 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1098956486] [2021-11-03 04:20:30,744 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-03 04:20:30,744 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:20:30,745 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-03 04:20:30,745 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-03 04:20:30,745 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 5 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:20:30,813 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:20:30,815 INFO L93 Difference]: Finished difference Result 31 states and 35 transitions. [2021-11-03 04:20:30,815 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-03 04:20:30,815 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 5 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2021-11-03 04:20:30,816 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:20:30,817 INFO L225 Difference]: With dead ends: 31 [2021-11-03 04:20:30,817 INFO L226 Difference]: Without dead ends: 20 [2021-11-03 04:20:30,818 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-03 04:20:30,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-11-03 04:20:30,821 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 17. [2021-11-03 04:20:30,823 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 16 states have (on average 1.1875) internal successors, (19), 16 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:20:30,823 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2021-11-03 04:20:30,824 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 14 [2021-11-03 04:20:30,824 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:20:30,824 INFO L470 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2021-11-03 04:20:30,825 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 5 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:20:30,825 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2021-11-03 04:20:30,826 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-03 04:20:30,826 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:20:30,827 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:20:30,827 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-03 04:20:30,828 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:20:30,829 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:20:30,830 INFO L85 PathProgramCache]: Analyzing trace with hash 233966664, now seen corresponding path program 1 times [2021-11-03 04:20:30,830 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:20:30,830 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1202529049] [2021-11-03 04:20:30,831 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:20:30,831 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:20:30,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:20:30,936 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:20:30,936 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:20:30,936 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1202529049] [2021-11-03 04:20:30,937 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1202529049] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:20:30,937 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [857286800] [2021-11-03 04:20:30,937 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:20:30,938 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:20:30,938 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:20:30,940 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:20:30,947 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-03 04:20:30,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:20:30,995 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-03 04:20:31,000 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:20:31,139 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:20:31,139 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:20:31,209 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:20:31,210 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [857286800] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:20:31,210 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1001300847] [2021-11-03 04:20:31,230 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-03 04:20:31,230 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:20:31,235 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:20:31,240 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:20:31,241 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:20:31,274 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:31,278 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:20:31,279 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:31,279 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 04:20:31,283 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:20:31,283 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:31,284 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 04:20:31,286 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-03 04:20:31,307 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_8|], 10=[|v_#valid_9|]} [2021-11-03 04:20:31,318 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:20:31,325 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-03 04:20:31,325 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:31,326 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:20:31,327 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:31,327 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:20:31,328 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 04:20:31,329 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:31,340 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:31,344 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:20:31,349 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:20:31,350 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:20:31,357 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:20:31,361 INFO L388 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 23 treesize of output 22 [2021-11-03 04:20:31,363 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:31,367 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:20:31,368 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:31,369 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:20:31,370 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 04:20:31,370 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:31,382 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:31,386 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:31,388 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:20:31,389 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 04:20:31,389 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-03 04:20:31,412 INFO L180 QuantifierPusher]: treesize reduction 13, result has 87.3 percent of original size [2021-11-03 04:20:31,416 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:20:31,430 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:31,446 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:20:31,448 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:31,455 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:20:31,460 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 88 [2021-11-03 04:20:31,472 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.4 percent of original size [2021-11-03 04:20:31,484 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 04:20:31,488 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:31,513 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:31,517 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:31,519 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:31,522 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:31,524 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:31,545 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:31,570 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:31,587 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-03 04:20:31,593 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:31,639 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:31,641 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:31,646 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:31,648 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:31,649 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:31,664 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:31,679 INFO L180 QuantifierPusher]: treesize reduction 24, result has 72.4 percent of original size [2021-11-03 04:20:31,704 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 42 [2021-11-03 04:20:31,713 INFO L180 QuantifierPusher]: treesize reduction 24, result has 68.0 percent of original size [2021-11-03 04:20:31,719 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:20:31,720 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:31,723 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 04:20:31,724 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 34 [2021-11-03 04:20:31,735 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:31,739 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 75 [2021-11-03 04:20:31,742 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:31,758 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:31,773 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:31,790 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:31,796 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 132 [2021-11-03 04:20:31,808 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:31,818 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 152 [2021-11-03 04:20:31,823 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:31,860 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:31,862 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:31,864 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:31,865 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:31,866 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:31,867 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:31,880 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:31,889 INFO L180 QuantifierPusher]: treesize reduction 24, result has 77.1 percent of original size [2021-11-03 04:20:31,894 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-03 04:20:31,897 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:31,906 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:31,907 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:31,909 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:31,910 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:31,918 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:31,929 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:20:31,934 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:20:31,950 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:20:31,956 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:20:31,958 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 04:20:32,759 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 04:20:32,759 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:20:32,759 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6, 6] total 12 [2021-11-03 04:20:32,760 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1719097196] [2021-11-03 04:20:32,760 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-03 04:20:32,760 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:20:32,761 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-03 04:20:32,762 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=352, Unknown=0, NotChecked=0, Total=420 [2021-11-03 04:20:32,762 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand has 12 states, 12 states have (on average 3.0) internal successors, (36), 12 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:20:32,938 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:20:32,939 INFO L93 Difference]: Finished difference Result 41 states and 47 transitions. [2021-11-03 04:20:32,939 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-03 04:20:32,939 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.0) internal successors, (36), 12 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2021-11-03 04:20:32,940 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:20:32,940 INFO L225 Difference]: With dead ends: 41 [2021-11-03 04:20:32,940 INFO L226 Difference]: Without dead ends: 30 [2021-11-03 04:20:32,941 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 166 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=131, Invalid=681, Unknown=0, NotChecked=0, Total=812 [2021-11-03 04:20:32,941 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-11-03 04:20:32,944 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 23. [2021-11-03 04:20:32,944 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 22 states have (on average 1.1363636363636365) internal successors, (25), 22 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:20:32,945 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2021-11-03 04:20:32,945 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 16 [2021-11-03 04:20:32,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:20:32,945 INFO L470 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2021-11-03 04:20:32,946 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 3.0) internal successors, (36), 12 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:20:32,946 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2021-11-03 04:20:32,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-03 04:20:32,946 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:20:32,946 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:20:32,984 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-03 04:20:33,159 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:20:33,160 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:20:33,160 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:20:33,160 INFO L85 PathProgramCache]: Analyzing trace with hash 885992160, now seen corresponding path program 2 times [2021-11-03 04:20:33,161 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:20:33,161 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1694379880] [2021-11-03 04:20:33,161 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:20:33,161 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:20:33,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:20:33,252 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 5 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:20:33,252 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:20:33,253 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1694379880] [2021-11-03 04:20:33,254 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1694379880] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:20:33,257 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [281568170] [2021-11-03 04:20:33,257 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-03 04:20:33,257 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:20:33,257 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:20:33,263 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:20:33,286 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-03 04:20:33,326 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-03 04:20:33,326 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 04:20:33,327 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-03 04:20:33,329 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:20:33,425 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:20:33,425 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:20:33,508 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:20:33,509 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [281568170] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:20:33,509 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [947028515] [2021-11-03 04:20:33,513 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-03 04:20:33,513 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:20:33,514 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:20:33,514 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:20:33,514 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:20:33,531 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:33,533 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:20:33,533 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:33,534 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 04:20:33,536 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:20:33,536 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:33,537 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 04:20:33,539 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-03 04:20:33,546 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_9|], 10=[|v_#valid_10|]} [2021-11-03 04:20:33,553 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:20:33,554 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-03 04:20:33,554 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:33,555 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:20:33,556 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:33,557 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:20:33,557 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 04:20:33,557 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:33,561 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:33,565 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:20:33,566 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:20:33,567 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:20:33,576 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:20:33,579 INFO L388 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 23 treesize of output 22 [2021-11-03 04:20:33,580 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:33,582 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:20:33,583 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:33,583 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:20:33,584 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 04:20:33,585 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:33,590 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:33,592 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:33,593 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:20:33,594 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 04:20:33,594 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-03 04:20:33,600 INFO L180 QuantifierPusher]: treesize reduction 13, result has 87.3 percent of original size [2021-11-03 04:20:33,603 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:20:33,607 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:33,612 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:20:33,613 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:33,616 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:20:33,618 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 88 [2021-11-03 04:20:33,622 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.4 percent of original size [2021-11-03 04:20:33,627 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 97 [2021-11-03 04:20:33,632 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:33,642 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:33,644 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:33,645 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:33,647 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:33,648 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:33,652 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:33,657 INFO L180 QuantifierPusher]: treesize reduction 24, result has 72.4 percent of original size [2021-11-03 04:20:33,663 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 42 [2021-11-03 04:20:33,670 INFO L180 QuantifierPusher]: treesize reduction 24, result has 68.0 percent of original size [2021-11-03 04:20:33,673 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:20:33,673 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:33,675 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 04:20:33,676 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 34 [2021-11-03 04:20:33,680 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:33,684 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-03 04:20:33,686 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:33,692 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:33,697 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:33,710 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:33,715 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 121 [2021-11-03 04:20:33,720 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:33,726 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 141 [2021-11-03 04:20:33,730 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:33,746 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:33,747 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:33,748 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:33,750 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:33,751 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:33,752 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:33,756 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:33,763 INFO L180 QuantifierPusher]: treesize reduction 24, result has 77.1 percent of original size [2021-11-03 04:20:33,766 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-03 04:20:33,768 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:33,776 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:33,777 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:33,778 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:33,778 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:33,781 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:33,789 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:20:33,794 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:20:33,803 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:20:33,806 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:20:33,809 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 04:20:34,530 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 04:20:34,530 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:20:34,530 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 5, 5] total 12 [2021-11-03 04:20:34,530 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1510422742] [2021-11-03 04:20:34,531 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-03 04:20:34,531 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:20:34,531 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-03 04:20:34,532 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=353, Unknown=0, NotChecked=0, Total=420 [2021-11-03 04:20:34,532 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand has 12 states, 12 states have (on average 3.5833333333333335) internal successors, (43), 12 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:20:34,771 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:20:34,771 INFO L93 Difference]: Finished difference Result 56 states and 63 transitions. [2021-11-03 04:20:34,771 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-03 04:20:34,771 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.5833333333333335) internal successors, (43), 12 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-11-03 04:20:34,772 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:20:34,773 INFO L225 Difference]: With dead ends: 56 [2021-11-03 04:20:34,774 INFO L226 Difference]: Without dead ends: 41 [2021-11-03 04:20:34,775 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 55 SyntacticMatches, 1 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 238 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=172, Invalid=884, Unknown=0, NotChecked=0, Total=1056 [2021-11-03 04:20:34,775 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-11-03 04:20:34,779 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 29. [2021-11-03 04:20:34,779 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 28 states have (on average 1.1071428571428572) internal successors, (31), 28 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:20:34,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2021-11-03 04:20:34,780 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 22 [2021-11-03 04:20:34,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:20:34,780 INFO L470 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2021-11-03 04:20:34,780 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 3.5833333333333335) internal successors, (43), 12 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:20:34,781 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2021-11-03 04:20:34,781 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-03 04:20:34,781 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:20:34,782 INFO L513 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:20:34,817 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-03 04:20:34,982 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:20:34,982 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:20:34,983 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:20:34,983 INFO L85 PathProgramCache]: Analyzing trace with hash -1367196232, now seen corresponding path program 3 times [2021-11-03 04:20:34,983 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:20:34,983 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1666021423] [2021-11-03 04:20:34,983 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:20:34,983 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:20:35,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:20:35,114 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 12 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:20:35,115 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:20:35,115 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1666021423] [2021-11-03 04:20:35,118 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1666021423] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:20:35,118 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1180534336] [2021-11-03 04:20:35,118 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-03 04:20:35,118 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:20:35,119 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:20:35,119 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:20:35,142 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-03 04:20:35,198 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-03 04:20:35,198 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 04:20:35,204 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-03 04:20:35,206 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:20:35,333 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 12 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:20:35,334 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:20:35,460 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 12 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:20:35,460 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1180534336] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:20:35,460 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1511169872] [2021-11-03 04:20:35,462 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-03 04:20:35,463 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:20:35,463 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:20:35,463 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:20:35,463 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:20:35,469 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:35,470 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:20:35,470 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:35,472 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 04:20:35,472 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:20:35,473 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:35,473 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 04:20:35,474 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-03 04:20:35,478 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_10|], 10=[|v_#valid_11|]} [2021-11-03 04:20:35,494 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:20:35,495 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-03 04:20:35,495 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:35,496 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:20:35,496 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:35,497 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:20:35,497 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 04:20:35,497 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:35,500 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:35,503 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:20:35,504 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:20:35,505 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:20:35,509 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:20:35,510 INFO L388 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 23 treesize of output 22 [2021-11-03 04:20:35,513 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:35,515 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:20:35,516 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:35,516 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:20:35,516 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 04:20:35,517 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:35,519 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:35,520 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:35,521 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:20:35,522 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 04:20:35,522 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-03 04:20:35,528 INFO L180 QuantifierPusher]: treesize reduction 13, result has 87.3 percent of original size [2021-11-03 04:20:35,530 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:20:35,535 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:35,540 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:20:35,541 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:35,544 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:20:35,545 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 88 [2021-11-03 04:20:35,547 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.4 percent of original size [2021-11-03 04:20:35,554 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 95 [2021-11-03 04:20:35,556 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:35,566 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:35,567 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:35,568 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:35,569 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:35,570 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:35,573 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:35,578 INFO L180 QuantifierPusher]: treesize reduction 24, result has 72.4 percent of original size [2021-11-03 04:20:35,582 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 42 [2021-11-03 04:20:35,587 INFO L180 QuantifierPusher]: treesize reduction 24, result has 68.0 percent of original size [2021-11-03 04:20:35,590 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:20:35,590 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:35,592 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 04:20:35,593 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 34 [2021-11-03 04:20:35,596 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:35,598 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 73 [2021-11-03 04:20:35,600 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:35,614 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:35,624 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:35,637 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:35,640 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 121 [2021-11-03 04:20:35,644 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:35,648 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 141 [2021-11-03 04:20:35,651 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:35,668 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:35,669 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:35,670 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:35,671 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:35,672 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:35,673 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:35,678 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:35,684 INFO L180 QuantifierPusher]: treesize reduction 24, result has 77.1 percent of original size [2021-11-03 04:20:35,687 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-03 04:20:35,689 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:35,696 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:35,697 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:35,698 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:35,699 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:35,702 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:35,708 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:20:35,711 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:20:35,718 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:20:35,723 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:20:35,725 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 04:20:36,431 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 04:20:36,431 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:20:36,431 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 6, 6] total 15 [2021-11-03 04:20:36,431 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1407258377] [2021-11-03 04:20:36,432 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-03 04:20:36,432 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:20:36,432 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-03 04:20:36,433 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=469, Unknown=0, NotChecked=0, Total=552 [2021-11-03 04:20:36,433 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand has 15 states, 15 states have (on average 3.6666666666666665) internal successors, (55), 15 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:20:36,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:20:36,752 INFO L93 Difference]: Finished difference Result 69 states and 77 transitions. [2021-11-03 04:20:36,754 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-03 04:20:36,754 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 3.6666666666666665) internal successors, (55), 15 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2021-11-03 04:20:36,755 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:20:36,755 INFO L225 Difference]: With dead ends: 69 [2021-11-03 04:20:36,755 INFO L226 Difference]: Without dead ends: 50 [2021-11-03 04:20:36,756 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 73 SyntacticMatches, 1 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 394 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=246, Invalid=1314, Unknown=0, NotChecked=0, Total=1560 [2021-11-03 04:20:36,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-11-03 04:20:36,763 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 35. [2021-11-03 04:20:36,765 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 1.088235294117647) internal successors, (37), 34 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:20:36,766 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2021-11-03 04:20:36,766 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 28 [2021-11-03 04:20:36,767 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:20:36,767 INFO L470 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2021-11-03 04:20:36,767 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 3.6666666666666665) internal successors, (55), 15 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:20:36,768 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2021-11-03 04:20:36,769 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-03 04:20:36,769 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:20:36,769 INFO L513 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:20:36,803 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-03 04:20:36,992 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable64 [2021-11-03 04:20:36,992 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:20:36,993 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:20:36,993 INFO L85 PathProgramCache]: Analyzing trace with hash -289016624, now seen corresponding path program 4 times [2021-11-03 04:20:36,993 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:20:36,993 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1324808919] [2021-11-03 04:20:36,993 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:20:36,993 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:20:37,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:20:37,103 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 23 proven. 29 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:20:37,104 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:20:37,104 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1324808919] [2021-11-03 04:20:37,104 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1324808919] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:20:37,104 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1323905037] [2021-11-03 04:20:37,104 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-03 04:20:37,104 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:20:37,104 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:20:37,113 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:20:37,114 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-03 04:20:37,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:20:37,199 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-03 04:20:37,201 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:20:37,436 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 32 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:20:37,436 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:20:37,572 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 32 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:20:37,572 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1323905037] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:20:37,572 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1789253992] [2021-11-03 04:20:37,574 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-03 04:20:37,574 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:20:37,575 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:20:37,575 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:20:37,575 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:20:37,583 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:37,584 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:20:37,584 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:37,585 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 04:20:37,585 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:20:37,585 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:37,586 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 04:20:37,587 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-03 04:20:37,592 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_11|], 10=[|v_#valid_12|]} [2021-11-03 04:20:37,599 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:20:37,599 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-03 04:20:37,607 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:37,608 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:20:37,609 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:37,609 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:20:37,609 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 04:20:37,610 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:37,612 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:37,615 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:20:37,616 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:20:37,617 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:20:37,626 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:20:37,629 INFO L388 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 23 treesize of output 22 [2021-11-03 04:20:37,630 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:37,632 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:20:37,633 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:37,633 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:20:37,634 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 04:20:37,635 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:37,647 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:37,649 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:37,651 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:20:37,652 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 04:20:37,652 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-03 04:20:37,663 INFO L180 QuantifierPusher]: treesize reduction 13, result has 87.3 percent of original size [2021-11-03 04:20:37,665 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:20:37,670 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:37,675 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:20:37,676 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:37,678 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:20:37,679 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 88 [2021-11-03 04:20:37,683 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.4 percent of original size [2021-11-03 04:20:37,687 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 04:20:37,689 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:37,697 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:37,698 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:37,699 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:37,700 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:37,701 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:37,703 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:37,708 INFO L180 QuantifierPusher]: treesize reduction 24, result has 72.4 percent of original size [2021-11-03 04:20:37,711 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 42 [2021-11-03 04:20:37,716 INFO L180 QuantifierPusher]: treesize reduction 24, result has 68.0 percent of original size [2021-11-03 04:20:37,717 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:20:37,718 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:37,720 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 04:20:37,720 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 34 [2021-11-03 04:20:37,724 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:37,726 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 75 [2021-11-03 04:20:37,729 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:37,734 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:37,739 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:37,750 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:37,753 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 132 [2021-11-03 04:20:37,756 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:37,760 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 152 [2021-11-03 04:20:37,763 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:37,779 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:37,780 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:37,781 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:37,782 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:37,783 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:37,784 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:37,788 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:37,793 INFO L180 QuantifierPusher]: treesize reduction 24, result has 77.1 percent of original size [2021-11-03 04:20:37,797 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-03 04:20:37,800 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:37,807 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:37,809 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:37,810 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:37,811 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:37,813 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:37,820 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:20:37,824 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:20:37,831 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:20:37,835 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:20:37,837 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 04:20:38,514 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 04:20:38,514 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:20:38,514 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 19 [2021-11-03 04:20:38,515 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2100799189] [2021-11-03 04:20:38,515 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-03 04:20:38,515 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:20:38,516 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-03 04:20:38,517 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=631, Unknown=0, NotChecked=0, Total=756 [2021-11-03 04:20:38,517 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand has 19 states, 19 states have (on average 3.0526315789473686) internal successors, (58), 19 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:20:38,689 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:20:38,689 INFO L93 Difference]: Finished difference Result 75 states and 83 transitions. [2021-11-03 04:20:38,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-03 04:20:38,689 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 3.0526315789473686) internal successors, (58), 19 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 34 [2021-11-03 04:20:38,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:20:38,690 INFO L225 Difference]: With dead ends: 75 [2021-11-03 04:20:38,691 INFO L226 Difference]: Without dead ends: 52 [2021-11-03 04:20:38,691 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 86 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 306 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=187, Invalid=869, Unknown=0, NotChecked=0, Total=1056 [2021-11-03 04:20:38,692 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-11-03 04:20:38,696 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 37. [2021-11-03 04:20:38,696 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 36 states have (on average 1.0833333333333333) internal successors, (39), 36 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:20:38,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 39 transitions. [2021-11-03 04:20:38,697 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 39 transitions. Word has length 34 [2021-11-03 04:20:38,697 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:20:38,697 INFO L470 AbstractCegarLoop]: Abstraction has 37 states and 39 transitions. [2021-11-03 04:20:38,697 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 3.0526315789473686) internal successors, (58), 19 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:20:38,697 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 39 transitions. [2021-11-03 04:20:38,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-03 04:20:38,698 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:20:38,698 INFO L513 BasicCegarLoop]: trace histogram [6, 5, 5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:20:38,735 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-03 04:20:38,911 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable91,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:20:38,912 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:20:38,912 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:20:38,912 INFO L85 PathProgramCache]: Analyzing trace with hash 1842565365, now seen corresponding path program 5 times [2021-11-03 04:20:38,912 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:20:38,912 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [652067895] [2021-11-03 04:20:38,912 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:20:38,912 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:20:38,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:20:39,006 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 20 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:20:39,006 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:20:39,006 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [652067895] [2021-11-03 04:20:39,006 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [652067895] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:20:39,007 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [352923404] [2021-11-03 04:20:39,007 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-03 04:20:39,007 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:20:39,007 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:20:39,008 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:20:39,016 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-03 04:20:39,127 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-03 04:20:39,127 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 04:20:39,129 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-03 04:20:39,130 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:20:39,272 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 30 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:20:39,272 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:20:39,420 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 30 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:20:39,420 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [352923404] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:20:39,420 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1720277450] [2021-11-03 04:20:39,423 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-03 04:20:39,423 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:20:39,423 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:20:39,423 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:20:39,424 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:20:39,436 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:39,437 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:20:39,438 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:39,440 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 04:20:39,441 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:20:39,441 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:39,442 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 04:20:39,443 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-03 04:20:39,447 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_12|], 10=[|v_#valid_13|]} [2021-11-03 04:20:39,452 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:20:39,453 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-03 04:20:39,453 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:39,454 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:20:39,454 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:39,454 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:20:39,455 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 04:20:39,455 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:39,460 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:39,463 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:20:39,464 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:20:39,465 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:20:39,469 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:20:39,474 INFO L388 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 23 treesize of output 22 [2021-11-03 04:20:39,475 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:39,476 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:20:39,477 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:39,477 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:20:39,478 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 04:20:39,478 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:39,482 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:39,483 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:39,484 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:20:39,484 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 04:20:39,485 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-03 04:20:39,490 INFO L180 QuantifierPusher]: treesize reduction 13, result has 87.3 percent of original size [2021-11-03 04:20:39,492 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:20:39,495 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:39,498 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:20:39,499 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:39,501 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:20:39,502 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 88 [2021-11-03 04:20:39,506 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.4 percent of original size [2021-11-03 04:20:39,513 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 91 [2021-11-03 04:20:39,516 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:39,525 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:39,526 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:39,527 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:39,528 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:39,530 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:39,534 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:39,545 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:39,550 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 101 [2021-11-03 04:20:39,553 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:39,566 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:39,568 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:39,570 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:39,571 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:39,572 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:39,576 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:39,581 INFO L180 QuantifierPusher]: treesize reduction 24, result has 72.4 percent of original size [2021-11-03 04:20:39,592 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 42 [2021-11-03 04:20:39,597 INFO L180 QuantifierPusher]: treesize reduction 24, result has 68.0 percent of original size [2021-11-03 04:20:39,599 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:20:39,600 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:39,601 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 04:20:39,602 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 34 [2021-11-03 04:20:39,605 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:39,608 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-03 04:20:39,610 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:39,616 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:39,622 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:39,636 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:39,638 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 121 [2021-11-03 04:20:39,642 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:39,646 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 141 [2021-11-03 04:20:39,649 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:39,663 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:39,664 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:39,665 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:39,666 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:39,667 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:39,667 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:39,671 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:39,677 INFO L180 QuantifierPusher]: treesize reduction 24, result has 77.1 percent of original size [2021-11-03 04:20:39,680 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-03 04:20:39,683 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:39,689 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:39,690 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:39,691 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:39,692 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:39,695 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:39,702 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:20:39,705 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:20:39,713 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:20:39,716 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:20:39,718 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 04:20:40,317 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 04:20:40,318 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:20:40,318 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 11 [2021-11-03 04:20:40,318 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2130621293] [2021-11-03 04:20:40,319 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-03 04:20:40,319 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:20:40,319 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-03 04:20:40,320 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=329, Unknown=0, NotChecked=0, Total=420 [2021-11-03 04:20:40,320 INFO L87 Difference]: Start difference. First operand 37 states and 39 transitions. Second operand has 12 states, 12 states have (on average 4.75) internal successors, (57), 11 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:20:40,454 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:20:40,454 INFO L93 Difference]: Finished difference Result 54 states and 57 transitions. [2021-11-03 04:20:40,454 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-03 04:20:40,455 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 4.75) internal successors, (57), 11 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 36 [2021-11-03 04:20:40,455 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:20:40,455 INFO L225 Difference]: With dead ends: 54 [2021-11-03 04:20:40,455 INFO L226 Difference]: Without dead ends: 52 [2021-11-03 04:20:40,456 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 98 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 219 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=184, Invalid=628, Unknown=0, NotChecked=0, Total=812 [2021-11-03 04:20:40,456 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-11-03 04:20:40,461 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 45. [2021-11-03 04:20:40,461 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 44 states have (on average 1.0681818181818181) internal successors, (47), 44 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:20:40,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 47 transitions. [2021-11-03 04:20:40,462 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 47 transitions. Word has length 36 [2021-11-03 04:20:40,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:20:40,462 INFO L470 AbstractCegarLoop]: Abstraction has 45 states and 47 transitions. [2021-11-03 04:20:40,462 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 4.75) internal successors, (57), 11 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:20:40,462 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 47 transitions. [2021-11-03 04:20:40,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-03 04:20:40,463 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:20:40,464 INFO L513 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:20:40,501 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-03 04:20:40,675 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable118,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:20:40,676 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:20:40,676 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:20:40,676 INFO L85 PathProgramCache]: Analyzing trace with hash -590488101, now seen corresponding path program 6 times [2021-11-03 04:20:40,676 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:20:40,676 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1119901480] [2021-11-03 04:20:40,676 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:20:40,676 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:20:40,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:20:40,844 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 57 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:20:40,844 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:20:40,845 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1119901480] [2021-11-03 04:20:40,845 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1119901480] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:20:40,845 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1293440676] [2021-11-03 04:20:40,845 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-03 04:20:40,845 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:20:40,846 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:20:40,846 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:20:40,870 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-03 04:20:41,021 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-03 04:20:41,021 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 04:20:41,022 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-03 04:20:41,025 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:20:41,345 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 72 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:20:41,345 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:20:41,505 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 72 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:20:41,505 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1293440676] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:20:41,505 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1821095688] [2021-11-03 04:20:41,508 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-03 04:20:41,508 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:20:41,508 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:20:41,508 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:20:41,509 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:20:41,513 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:41,514 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:20:41,514 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:41,514 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 04:20:41,515 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:20:41,515 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:41,516 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 04:20:41,517 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-03 04:20:41,519 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_13|], 10=[|v_#valid_14|]} [2021-11-03 04:20:41,524 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:20:41,524 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-03 04:20:41,525 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:41,525 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:20:41,526 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:41,526 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:20:41,526 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 04:20:41,527 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:41,530 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:41,532 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:20:41,533 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:20:41,534 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:20:41,537 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:20:41,538 INFO L388 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 23 treesize of output 22 [2021-11-03 04:20:41,539 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:41,540 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:20:41,541 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:41,541 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:20:41,541 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 04:20:41,542 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:41,545 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:41,546 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:41,546 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:20:41,547 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 04:20:41,547 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-03 04:20:41,552 INFO L180 QuantifierPusher]: treesize reduction 13, result has 87.3 percent of original size [2021-11-03 04:20:41,554 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:20:41,557 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:41,559 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:20:41,560 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:41,562 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:20:41,563 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 88 [2021-11-03 04:20:41,566 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.4 percent of original size [2021-11-03 04:20:41,569 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 95 [2021-11-03 04:20:41,572 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:41,579 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:41,580 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:41,581 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:41,582 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:41,583 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:41,586 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:41,590 INFO L180 QuantifierPusher]: treesize reduction 24, result has 72.4 percent of original size [2021-11-03 04:20:41,593 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 42 [2021-11-03 04:20:41,597 INFO L180 QuantifierPusher]: treesize reduction 24, result has 68.0 percent of original size [2021-11-03 04:20:41,599 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:20:41,599 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:41,601 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 04:20:41,601 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 34 [2021-11-03 04:20:41,605 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:41,608 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 75 [2021-11-03 04:20:41,610 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:41,614 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:41,619 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:41,628 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:41,631 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 132 [2021-11-03 04:20:41,634 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:41,637 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 152 [2021-11-03 04:20:41,641 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:41,654 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:41,655 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:41,656 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:41,657 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:41,657 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:41,658 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:41,661 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:41,666 INFO L180 QuantifierPusher]: treesize reduction 24, result has 77.1 percent of original size [2021-11-03 04:20:41,668 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-03 04:20:41,670 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:41,677 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:41,678 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:41,679 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:41,680 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:41,687 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:41,692 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:20:41,695 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:20:41,701 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:20:41,704 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:20:41,706 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 04:20:42,366 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 04:20:42,367 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:20:42,367 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 26 [2021-11-03 04:20:42,367 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [199328277] [2021-11-03 04:20:42,367 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-03 04:20:42,368 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:20:42,368 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-03 04:20:42,369 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=206, Invalid=984, Unknown=0, NotChecked=0, Total=1190 [2021-11-03 04:20:42,369 INFO L87 Difference]: Start difference. First operand 45 states and 47 transitions. Second operand has 26 states, 26 states have (on average 3.269230769230769) internal successors, (85), 26 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:20:42,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:20:42,666 INFO L93 Difference]: Finished difference Result 124 states and 135 transitions. [2021-11-03 04:20:42,666 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-03 04:20:42,666 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 3.269230769230769) internal successors, (85), 26 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 44 [2021-11-03 04:20:42,666 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:20:42,667 INFO L225 Difference]: With dead ends: 124 [2021-11-03 04:20:42,667 INFO L226 Difference]: Without dead ends: 70 [2021-11-03 04:20:42,669 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 112 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 654 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=422, Invalid=1834, Unknown=0, NotChecked=0, Total=2256 [2021-11-03 04:20:42,670 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2021-11-03 04:20:42,675 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 49. [2021-11-03 04:20:42,675 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 48 states have (on average 1.0625) internal successors, (51), 48 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:20:42,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 51 transitions. [2021-11-03 04:20:42,676 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 51 transitions. Word has length 44 [2021-11-03 04:20:42,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:20:42,676 INFO L470 AbstractCegarLoop]: Abstraction has 49 states and 51 transitions. [2021-11-03 04:20:42,677 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 3.269230769230769) internal successors, (85), 26 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:20:42,677 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 51 transitions. [2021-11-03 04:20:42,678 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-03 04:20:42,678 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:20:42,678 INFO L513 BasicCegarLoop]: trace histogram [8, 7, 7, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:20:42,719 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-03 04:20:42,903 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable152,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:20:42,904 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:20:42,904 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:20:42,904 INFO L85 PathProgramCache]: Analyzing trace with hash 1203330149, now seen corresponding path program 7 times [2021-11-03 04:20:42,904 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:20:42,904 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [969315005] [2021-11-03 04:20:42,905 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:20:42,905 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:20:42,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:20:43,010 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 42 proven. 86 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:20:43,010 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:20:43,011 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [969315005] [2021-11-03 04:20:43,011 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [969315005] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:20:43,011 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [421985297] [2021-11-03 04:20:43,011 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-03 04:20:43,011 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:20:43,011 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:20:43,012 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:20:43,034 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-03 04:20:43,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:20:43,212 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-03 04:20:43,214 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:20:43,376 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 56 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:20:43,376 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:20:43,520 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 56 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:20:43,521 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [421985297] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:20:43,521 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1154756407] [2021-11-03 04:20:43,523 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-03 04:20:43,523 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:20:43,523 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:20:43,524 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:20:43,524 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:20:43,528 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:43,528 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:20:43,529 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:43,529 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 04:20:43,530 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:20:43,530 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:43,531 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 04:20:43,532 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-03 04:20:43,539 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_14|], 10=[|v_#valid_15|]} [2021-11-03 04:20:43,544 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:20:43,545 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-03 04:20:43,546 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:43,546 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:20:43,546 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:43,547 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:20:43,547 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 04:20:43,548 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:43,550 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:43,553 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:20:43,554 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:20:43,555 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:20:43,558 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:20:43,560 INFO L388 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 23 treesize of output 22 [2021-11-03 04:20:43,561 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:43,562 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:20:43,563 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:43,563 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:20:43,563 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 04:20:43,564 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:43,568 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:43,569 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:43,570 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:20:43,571 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 04:20:43,571 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-03 04:20:43,576 INFO L180 QuantifierPusher]: treesize reduction 13, result has 87.3 percent of original size [2021-11-03 04:20:43,578 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:20:43,581 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:43,584 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:20:43,585 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:43,587 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:20:43,588 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 88 [2021-11-03 04:20:43,591 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.4 percent of original size [2021-11-03 04:20:43,597 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 95 [2021-11-03 04:20:43,600 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:43,607 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:43,608 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:43,609 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:43,610 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:43,611 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:43,623 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:43,627 INFO L180 QuantifierPusher]: treesize reduction 24, result has 72.4 percent of original size [2021-11-03 04:20:43,629 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 42 [2021-11-03 04:20:43,634 INFO L180 QuantifierPusher]: treesize reduction 24, result has 68.0 percent of original size [2021-11-03 04:20:43,636 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:20:43,637 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:43,639 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 04:20:43,639 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 34 [2021-11-03 04:20:43,642 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:43,644 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 73 [2021-11-03 04:20:43,646 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:43,651 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:43,656 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:43,667 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:43,669 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 121 [2021-11-03 04:20:43,672 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:43,675 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 141 [2021-11-03 04:20:43,678 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:43,690 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:43,691 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:43,692 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:43,693 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:43,693 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:43,694 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:43,701 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:43,706 INFO L180 QuantifierPusher]: treesize reduction 24, result has 77.1 percent of original size [2021-11-03 04:20:43,708 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-03 04:20:43,710 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:43,717 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:43,718 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:43,718 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:43,719 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:43,722 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:43,726 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:20:43,729 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:20:43,735 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:20:43,738 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:20:43,740 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 04:20:44,349 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 04:20:44,349 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:20:44,350 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 13 [2021-11-03 04:20:44,350 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [907444895] [2021-11-03 04:20:44,350 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-03 04:20:44,350 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:20:44,351 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-03 04:20:44,351 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=396, Unknown=0, NotChecked=0, Total=506 [2021-11-03 04:20:44,352 INFO L87 Difference]: Start difference. First operand 49 states and 51 transitions. Second operand has 14 states, 14 states have (on average 4.928571428571429) internal successors, (69), 13 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:20:44,526 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:20:44,526 INFO L93 Difference]: Finished difference Result 66 states and 69 transitions. [2021-11-03 04:20:44,526 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-03 04:20:44,526 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 4.928571428571429) internal successors, (69), 13 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 48 [2021-11-03 04:20:44,527 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:20:44,527 INFO L225 Difference]: With dead ends: 66 [2021-11-03 04:20:44,527 INFO L226 Difference]: Without dead ends: 64 [2021-11-03 04:20:44,528 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 136 SyntacticMatches, 1 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 295 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=245, Invalid=811, Unknown=0, NotChecked=0, Total=1056 [2021-11-03 04:20:44,529 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-11-03 04:20:44,534 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 57. [2021-11-03 04:20:44,534 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 56 states have (on average 1.0535714285714286) internal successors, (59), 56 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:20:44,535 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 59 transitions. [2021-11-03 04:20:44,535 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 59 transitions. Word has length 48 [2021-11-03 04:20:44,536 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:20:44,536 INFO L470 AbstractCegarLoop]: Abstraction has 57 states and 59 transitions. [2021-11-03 04:20:44,536 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 4.928571428571429) internal successors, (69), 13 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:20:44,536 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 59 transitions. [2021-11-03 04:20:44,537 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-03 04:20:44,537 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:20:44,537 INFO L513 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:20:44,559 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-03 04:20:44,751 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable179 [2021-11-03 04:20:44,752 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:20:44,752 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:20:44,752 INFO L85 PathProgramCache]: Analyzing trace with hash 1063876939, now seen corresponding path program 8 times [2021-11-03 04:20:44,752 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:20:44,752 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [81640470] [2021-11-03 04:20:44,752 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:20:44,752 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:20:44,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:20:44,933 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 107 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:20:44,933 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:20:44,933 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [81640470] [2021-11-03 04:20:44,933 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [81640470] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:20:44,933 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [985975795] [2021-11-03 04:20:44,934 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-03 04:20:44,934 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:20:44,934 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:20:44,939 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:20:44,959 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-03 04:20:45,159 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2021-11-03 04:20:45,160 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 04:20:45,161 INFO L263 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-03 04:20:45,163 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:20:45,618 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 128 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:20:45,619 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:20:45,839 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 128 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:20:45,839 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [985975795] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:20:45,840 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1583259906] [2021-11-03 04:20:45,842 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-03 04:20:45,842 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:20:45,842 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:20:45,842 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:20:45,843 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:20:45,853 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:45,853 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:20:45,854 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:45,855 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 04:20:45,855 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:20:45,855 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:45,856 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 04:20:45,857 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-03 04:20:45,863 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_15|], 10=[|v_#valid_16|]} [2021-11-03 04:20:45,868 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:20:45,869 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-03 04:20:45,870 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:45,870 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:20:45,871 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:45,871 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:20:45,872 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 04:20:45,872 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:45,874 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:45,877 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:20:45,878 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:20:45,879 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:20:45,882 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:20:45,883 INFO L388 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 23 treesize of output 22 [2021-11-03 04:20:45,884 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:45,885 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:20:45,886 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:45,886 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:20:45,886 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 04:20:45,887 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:45,890 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:45,891 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:45,892 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:20:45,892 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 04:20:45,892 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-03 04:20:45,898 INFO L180 QuantifierPusher]: treesize reduction 13, result has 87.3 percent of original size [2021-11-03 04:20:45,899 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:20:45,902 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:45,906 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:20:45,906 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:45,908 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:20:45,916 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 88 [2021-11-03 04:20:45,921 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.4 percent of original size [2021-11-03 04:20:45,926 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 97 [2021-11-03 04:20:45,928 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:45,944 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:45,945 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:45,946 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:45,947 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:45,947 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:45,951 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:45,955 INFO L180 QuantifierPusher]: treesize reduction 24, result has 72.4 percent of original size [2021-11-03 04:20:45,958 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 42 [2021-11-03 04:20:45,963 INFO L180 QuantifierPusher]: treesize reduction 24, result has 68.0 percent of original size [2021-11-03 04:20:45,964 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:20:45,965 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:45,966 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 04:20:45,967 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 34 [2021-11-03 04:20:45,970 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:45,973 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 73 [2021-11-03 04:20:45,975 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:45,980 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:45,991 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:46,000 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:46,002 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 132 [2021-11-03 04:20:46,005 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:46,008 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 152 [2021-11-03 04:20:46,011 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:46,024 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:46,025 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:46,026 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:46,028 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:46,029 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:46,030 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:46,034 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:46,039 INFO L180 QuantifierPusher]: treesize reduction 24, result has 77.1 percent of original size [2021-11-03 04:20:46,042 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-03 04:20:46,044 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:46,049 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:46,050 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:46,051 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:46,052 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:46,055 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:46,059 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:20:46,062 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:20:46,075 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:20:46,077 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:20:46,079 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 04:20:46,765 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 04:20:46,765 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:20:46,765 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 32 [2021-11-03 04:20:46,765 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1755081004] [2021-11-03 04:20:46,766 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-03 04:20:46,766 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:20:46,767 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-03 04:20:46,768 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=290, Invalid=1350, Unknown=0, NotChecked=0, Total=1640 [2021-11-03 04:20:46,768 INFO L87 Difference]: Start difference. First operand 57 states and 59 transitions. Second operand has 32 states, 32 states have (on average 3.28125) internal successors, (105), 32 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:20:47,129 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:20:47,129 INFO L93 Difference]: Finished difference Result 158 states and 171 transitions. [2021-11-03 04:20:47,129 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-03 04:20:47,130 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 3.28125) internal successors, (105), 32 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 56 [2021-11-03 04:20:47,130 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:20:47,131 INFO L225 Difference]: With dead ends: 158 [2021-11-03 04:20:47,131 INFO L226 Difference]: Without dead ends: 88 [2021-11-03 04:20:47,133 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 146 SyntacticMatches, 0 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 950 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=640, Invalid=2666, Unknown=0, NotChecked=0, Total=3306 [2021-11-03 04:20:47,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2021-11-03 04:20:47,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 61. [2021-11-03 04:20:47,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 60 states have (on average 1.05) internal successors, (63), 60 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:20:47,139 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 63 transitions. [2021-11-03 04:20:47,140 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 63 transitions. Word has length 56 [2021-11-03 04:20:47,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:20:47,140 INFO L470 AbstractCegarLoop]: Abstraction has 61 states and 63 transitions. [2021-11-03 04:20:47,140 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 3.28125) internal successors, (105), 32 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:20:47,141 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 63 transitions. [2021-11-03 04:20:47,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-03 04:20:47,142 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:20:47,142 INFO L513 BasicCegarLoop]: trace histogram [10, 9, 9, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:20:47,163 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-03 04:20:47,343 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable206,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:20:47,344 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:20:47,344 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:20:47,344 INFO L85 PathProgramCache]: Analyzing trace with hash -1314293547, now seen corresponding path program 9 times [2021-11-03 04:20:47,344 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:20:47,344 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [247932608] [2021-11-03 04:20:47,344 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:20:47,345 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:20:47,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:20:47,466 INFO L134 CoverageAnalysis]: Checked inductivity of 218 backedges. 72 proven. 146 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:20:47,466 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:20:47,467 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [247932608] [2021-11-03 04:20:47,467 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [247932608] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:20:47,467 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1726207388] [2021-11-03 04:20:47,467 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-03 04:20:47,467 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:20:47,467 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:20:47,468 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:20:47,469 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-03 04:20:47,700 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-03 04:20:47,700 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 04:20:47,701 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-03 04:20:47,704 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:20:47,918 INFO L134 CoverageAnalysis]: Checked inductivity of 218 backedges. 90 proven. 128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:20:47,918 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:20:48,125 INFO L134 CoverageAnalysis]: Checked inductivity of 218 backedges. 90 proven. 128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:20:48,126 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1726207388] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:20:48,126 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1569854498] [2021-11-03 04:20:48,128 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-03 04:20:48,128 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:20:48,129 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:20:48,129 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:20:48,129 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:20:48,136 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:48,137 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:20:48,137 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:48,137 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 04:20:48,138 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:20:48,139 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:48,140 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 04:20:48,141 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-03 04:20:48,144 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_16|], 10=[|v_#valid_17|]} [2021-11-03 04:20:48,149 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:20:48,150 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-03 04:20:48,151 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:48,151 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:20:48,152 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:48,152 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:20:48,152 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 04:20:48,153 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:48,163 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:48,166 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:20:48,167 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:20:48,168 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:20:48,174 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:20:48,176 INFO L388 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 23 treesize of output 22 [2021-11-03 04:20:48,176 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:48,178 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:20:48,178 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:48,182 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:20:48,182 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 04:20:48,183 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:48,185 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:48,187 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:48,188 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:20:48,189 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 04:20:48,189 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-03 04:20:48,216 INFO L180 QuantifierPusher]: treesize reduction 13, result has 87.3 percent of original size [2021-11-03 04:20:48,217 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:20:48,221 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:48,225 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:20:48,225 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:48,227 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:20:48,228 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 88 [2021-11-03 04:20:48,231 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.4 percent of original size [2021-11-03 04:20:48,238 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 04:20:48,240 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:48,246 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:48,247 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:48,248 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:48,249 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:48,250 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:48,252 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:48,258 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:48,262 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 96 [2021-11-03 04:20:48,272 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:48,280 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:48,281 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:48,284 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:48,285 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:48,286 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:48,288 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:48,292 INFO L180 QuantifierPusher]: treesize reduction 24, result has 72.4 percent of original size [2021-11-03 04:20:48,295 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 42 [2021-11-03 04:20:48,299 INFO L180 QuantifierPusher]: treesize reduction 24, result has 68.0 percent of original size [2021-11-03 04:20:48,301 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:20:48,301 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:48,303 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 04:20:48,304 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 34 [2021-11-03 04:20:48,306 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:48,308 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 73 [2021-11-03 04:20:48,310 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:48,314 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:48,319 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:48,327 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:48,329 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 132 [2021-11-03 04:20:48,332 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:48,335 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 152 [2021-11-03 04:20:48,338 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:48,349 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:48,350 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:48,361 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:48,363 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:48,364 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:48,365 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:48,368 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:48,373 INFO L180 QuantifierPusher]: treesize reduction 24, result has 77.1 percent of original size [2021-11-03 04:20:48,375 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-03 04:20:48,377 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:48,382 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:48,383 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:48,384 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:48,385 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:48,387 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:48,391 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:20:48,394 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:20:48,400 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:20:48,402 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:20:48,404 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 04:20:49,057 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 04:20:49,058 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:20:49,058 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 15 [2021-11-03 04:20:49,058 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1928780109] [2021-11-03 04:20:49,059 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-03 04:20:49,059 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:20:49,059 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-03 04:20:49,059 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=133, Invalid=467, Unknown=0, NotChecked=0, Total=600 [2021-11-03 04:20:49,060 INFO L87 Difference]: Start difference. First operand 61 states and 63 transitions. Second operand has 16 states, 16 states have (on average 5.0625) internal successors, (81), 15 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:20:49,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:20:49,269 INFO L93 Difference]: Finished difference Result 78 states and 81 transitions. [2021-11-03 04:20:49,269 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-03 04:20:49,269 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 5.0625) internal successors, (81), 15 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2021-11-03 04:20:49,269 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:20:49,270 INFO L225 Difference]: With dead ends: 78 [2021-11-03 04:20:49,270 INFO L226 Difference]: Without dead ends: 76 [2021-11-03 04:20:49,271 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 174 SyntacticMatches, 1 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 379 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=318, Invalid=1014, Unknown=0, NotChecked=0, Total=1332 [2021-11-03 04:20:49,271 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2021-11-03 04:20:49,277 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 69. [2021-11-03 04:20:49,277 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 68 states have (on average 1.0441176470588236) internal successors, (71), 68 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:20:49,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 71 transitions. [2021-11-03 04:20:49,278 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 71 transitions. Word has length 60 [2021-11-03 04:20:49,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:20:49,278 INFO L470 AbstractCegarLoop]: Abstraction has 69 states and 71 transitions. [2021-11-03 04:20:49,278 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 5.0625) internal successors, (81), 15 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:20:49,278 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 71 transitions. [2021-11-03 04:20:49,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-03 04:20:49,279 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:20:49,280 INFO L513 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:20:49,302 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-03 04:20:49,491 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable233 [2021-11-03 04:20:49,492 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:20:49,492 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:20:49,492 INFO L85 PathProgramCache]: Analyzing trace with hash 325985723, now seen corresponding path program 10 times [2021-11-03 04:20:49,492 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:20:49,493 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1095548291] [2021-11-03 04:20:49,493 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:20:49,493 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:20:49,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:20:49,744 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 173 proven. 117 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:20:49,744 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:20:49,744 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1095548291] [2021-11-03 04:20:49,744 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1095548291] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:20:49,744 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1090789641] [2021-11-03 04:20:49,744 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-03 04:20:49,745 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:20:49,745 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:20:49,745 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:20:49,748 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-03 04:20:50,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:20:50,018 INFO L263 TraceCheckSpWp]: Trace formula consists of 261 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-03 04:20:50,020 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:20:50,543 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 198 proven. 90 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-03 04:20:50,543 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:20:50,753 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 198 proven. 90 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-03 04:20:50,753 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1090789641] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:20:50,753 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [851059705] [2021-11-03 04:20:50,761 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-03 04:20:50,761 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:20:50,761 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:20:50,762 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:20:50,762 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:20:50,769 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:50,770 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:20:50,770 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:50,771 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 04:20:50,771 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:20:50,772 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:50,772 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 04:20:50,774 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-03 04:20:50,776 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_17|], 10=[|v_#valid_18|]} [2021-11-03 04:20:50,782 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:20:50,782 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-03 04:20:50,783 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:50,783 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:20:50,784 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:50,784 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:20:50,784 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 04:20:50,785 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:50,789 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:50,792 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:20:50,793 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:20:50,794 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:20:50,797 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:20:50,802 INFO L388 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 23 treesize of output 22 [2021-11-03 04:20:50,803 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:50,804 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:20:50,804 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:50,804 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:20:50,804 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 04:20:50,805 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:50,807 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:50,808 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:50,809 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:20:50,809 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 04:20:50,809 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-03 04:20:50,816 INFO L180 QuantifierPusher]: treesize reduction 13, result has 87.3 percent of original size [2021-11-03 04:20:50,818 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:20:50,821 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:50,829 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:20:50,830 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:50,832 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:20:50,833 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 88 [2021-11-03 04:20:50,837 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.4 percent of original size [2021-11-03 04:20:50,841 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 97 [2021-11-03 04:20:50,844 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:50,850 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:50,851 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:50,852 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:50,853 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:50,853 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:50,856 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:50,859 INFO L180 QuantifierPusher]: treesize reduction 24, result has 72.4 percent of original size [2021-11-03 04:20:50,862 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 42 [2021-11-03 04:20:50,866 INFO L180 QuantifierPusher]: treesize reduction 24, result has 68.0 percent of original size [2021-11-03 04:20:50,867 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:20:50,867 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:50,869 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 04:20:50,869 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 34 [2021-11-03 04:20:50,872 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:50,874 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 73 [2021-11-03 04:20:50,876 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:50,880 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:50,883 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:50,902 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:50,905 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 121 [2021-11-03 04:20:50,908 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:50,911 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 141 [2021-11-03 04:20:50,914 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:50,924 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:50,925 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:50,926 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:50,927 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:50,927 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:50,928 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:50,931 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:50,935 INFO L180 QuantifierPusher]: treesize reduction 24, result has 77.1 percent of original size [2021-11-03 04:20:50,937 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-03 04:20:50,939 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:50,944 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:50,945 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:50,946 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:50,946 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:50,949 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:50,953 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:20:50,955 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:20:50,961 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:20:50,963 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:20:50,965 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 04:20:51,677 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 04:20:51,677 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:20:51,677 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22, 22] total 35 [2021-11-03 04:20:51,677 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [873884658] [2021-11-03 04:20:51,678 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-03 04:20:51,678 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:20:51,678 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-03 04:20:51,679 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=327, Invalid=1565, Unknown=0, NotChecked=0, Total=1892 [2021-11-03 04:20:51,679 INFO L87 Difference]: Start difference. First operand 69 states and 71 transitions. Second operand has 35 states, 35 states have (on average 3.3142857142857145) internal successors, (116), 35 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:20:51,980 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:20:51,980 INFO L93 Difference]: Finished difference Result 146 states and 159 transitions. [2021-11-03 04:20:51,980 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-03 04:20:51,981 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 3.3142857142857145) internal successors, (116), 35 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 68 [2021-11-03 04:20:51,981 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:20:51,982 INFO L225 Difference]: With dead ends: 146 [2021-11-03 04:20:51,982 INFO L226 Difference]: Without dead ends: 101 [2021-11-03 04:20:51,984 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 235 GetRequests, 183 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 820 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=549, Invalid=2313, Unknown=0, NotChecked=0, Total=2862 [2021-11-03 04:20:51,984 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2021-11-03 04:20:51,990 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 71. [2021-11-03 04:20:51,991 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 70 states have (on average 1.042857142857143) internal successors, (73), 70 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:20:51,992 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 73 transitions. [2021-11-03 04:20:51,993 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 73 transitions. Word has length 68 [2021-11-03 04:20:51,993 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:20:51,993 INFO L470 AbstractCegarLoop]: Abstraction has 71 states and 73 transitions. [2021-11-03 04:20:51,993 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 3.3142857142857145) internal successors, (116), 35 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:20:51,994 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 73 transitions. [2021-11-03 04:20:51,995 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-03 04:20:51,995 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:20:51,995 INFO L513 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:20:52,021 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-03 04:20:52,203 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable267 [2021-11-03 04:20:52,204 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:20:52,204 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:20:52,204 INFO L85 PathProgramCache]: Analyzing trace with hash 1366833312, now seen corresponding path program 11 times [2021-11-03 04:20:52,204 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:20:52,204 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2108021538] [2021-11-03 04:20:52,204 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:20:52,204 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:20:52,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:20:52,486 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 173 proven. 137 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:20:52,486 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:20:52,486 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2108021538] [2021-11-03 04:20:52,486 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2108021538] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:20:52,486 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [510177253] [2021-11-03 04:20:52,487 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-03 04:20:52,487 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:20:52,487 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:20:52,487 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:20:52,488 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-03 04:20:52,834 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2021-11-03 04:20:52,834 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 04:20:52,836 INFO L263 TraceCheckSpWp]: Trace formula consists of 271 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-03 04:20:52,837 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:20:53,238 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 110 proven. 200 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:20:53,238 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:20:53,462 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 110 proven. 200 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:20:53,462 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [510177253] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:20:53,462 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [177908945] [2021-11-03 04:20:53,464 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-03 04:20:53,464 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:20:53,464 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:20:53,464 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:20:53,465 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:20:53,468 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:53,469 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:20:53,469 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:53,469 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 04:20:53,470 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:20:53,471 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:53,472 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 04:20:53,473 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-03 04:20:53,475 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_18|], 10=[|v_#valid_19|]} [2021-11-03 04:20:53,480 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:20:53,482 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-03 04:20:53,483 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:53,483 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:20:53,484 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:53,484 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:20:53,484 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 04:20:53,485 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:53,487 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:53,489 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:20:53,490 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:20:53,491 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:20:53,495 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:20:53,497 INFO L388 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 23 treesize of output 22 [2021-11-03 04:20:53,498 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:53,499 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:20:53,499 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:53,500 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:20:53,500 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 04:20:53,500 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:53,502 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:53,503 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:53,504 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:20:53,504 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 04:20:53,505 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-03 04:20:53,510 INFO L180 QuantifierPusher]: treesize reduction 13, result has 87.3 percent of original size [2021-11-03 04:20:53,511 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:20:53,514 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:53,516 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:20:53,517 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:53,519 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:20:53,520 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 88 [2021-11-03 04:20:53,522 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.4 percent of original size [2021-11-03 04:20:53,525 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 04:20:53,528 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:53,533 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:53,534 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:53,535 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:53,536 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:53,537 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:53,539 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:53,544 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:53,548 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-03 04:20:53,551 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:53,557 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:53,558 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:53,559 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:53,559 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:53,560 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:53,562 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:53,565 INFO L180 QuantifierPusher]: treesize reduction 24, result has 72.4 percent of original size [2021-11-03 04:20:53,568 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 42 [2021-11-03 04:20:53,572 INFO L180 QuantifierPusher]: treesize reduction 24, result has 68.0 percent of original size [2021-11-03 04:20:53,573 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:20:53,574 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:53,575 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 04:20:53,576 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 34 [2021-11-03 04:20:53,578 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:53,580 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 73 [2021-11-03 04:20:53,582 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:53,586 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:53,590 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:53,597 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:53,600 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 132 [2021-11-03 04:20:53,602 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:53,605 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 152 [2021-11-03 04:20:53,608 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:53,638 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:53,638 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:53,639 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:53,639 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:53,641 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:53,642 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:53,645 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:53,649 INFO L180 QuantifierPusher]: treesize reduction 24, result has 77.1 percent of original size [2021-11-03 04:20:53,651 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-03 04:20:53,654 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:53,658 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:53,659 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:53,659 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:53,660 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:53,663 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:53,667 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:20:53,670 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:20:53,676 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:20:53,678 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:20:53,681 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 04:20:54,369 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 04:20:54,369 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:20:54,370 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 13, 13] total 36 [2021-11-03 04:20:54,370 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1630586454] [2021-11-03 04:20:54,370 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-11-03 04:20:54,370 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:20:54,370 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-11-03 04:20:54,371 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=279, Invalid=1701, Unknown=0, NotChecked=0, Total=1980 [2021-11-03 04:20:54,371 INFO L87 Difference]: Start difference. First operand 71 states and 73 transitions. Second operand has 36 states, 36 states have (on average 3.861111111111111) internal successors, (139), 36 states have internal predecessors, (139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:20:55,301 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:20:55,301 INFO L93 Difference]: Finished difference Result 160 states and 175 transitions. [2021-11-03 04:20:55,302 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-11-03 04:20:55,302 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 3.861111111111111) internal successors, (139), 36 states have internal predecessors, (139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 70 [2021-11-03 04:20:55,302 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:20:55,303 INFO L225 Difference]: With dead ends: 160 [2021-11-03 04:20:55,303 INFO L226 Difference]: Without dead ends: 113 [2021-11-03 04:20:55,305 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 287 GetRequests, 199 SyntacticMatches, 1 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2466 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1184, Invalid=6648, Unknown=0, NotChecked=0, Total=7832 [2021-11-03 04:20:55,306 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2021-11-03 04:20:55,313 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 77. [2021-11-03 04:20:55,313 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 76 states have (on average 1.0394736842105263) internal successors, (79), 76 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:20:55,314 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 79 transitions. [2021-11-03 04:20:55,314 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 79 transitions. Word has length 70 [2021-11-03 04:20:55,314 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:20:55,314 INFO L470 AbstractCegarLoop]: Abstraction has 77 states and 79 transitions. [2021-11-03 04:20:55,315 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 3.861111111111111) internal successors, (139), 36 states have internal predecessors, (139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:20:55,315 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 79 transitions. [2021-11-03 04:20:55,316 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-11-03 04:20:55,316 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:20:55,316 INFO L513 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:20:55,344 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-03 04:20:55,531 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable294,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:20:55,532 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:20:55,532 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:20:55,532 INFO L85 PathProgramCache]: Analyzing trace with hash -1928614536, now seen corresponding path program 12 times [2021-11-03 04:20:55,532 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:20:55,532 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1725915304] [2021-11-03 04:20:55,532 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:20:55,532 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:20:55,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:20:55,921 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 212 proven. 162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:20:55,922 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:20:55,922 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1725915304] [2021-11-03 04:20:55,922 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1725915304] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:20:55,922 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [889716073] [2021-11-03 04:20:55,923 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-03 04:20:55,923 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:20:55,923 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:20:55,924 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:20:55,943 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-03 04:20:56,313 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-03 04:20:56,313 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 04:20:56,314 INFO L263 TraceCheckSpWp]: Trace formula consists of 293 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-03 04:20:56,317 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:20:56,711 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 132 proven. 242 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:20:56,711 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:20:56,940 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 132 proven. 242 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:20:56,941 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [889716073] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:20:56,941 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1118695159] [2021-11-03 04:20:56,942 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-03 04:20:56,943 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:20:56,943 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:20:56,943 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:20:56,944 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:20:56,958 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:56,958 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:20:56,961 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:56,962 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 04:20:56,962 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:20:56,962 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:56,963 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 04:20:56,963 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-03 04:20:56,969 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_19|], 10=[|v_#valid_20|]} [2021-11-03 04:20:56,973 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:20:56,974 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-03 04:20:56,974 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:56,975 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:20:56,975 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:56,975 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:20:56,975 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 04:20:56,976 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:56,977 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:56,979 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:20:56,980 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:20:56,981 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:20:56,984 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:20:56,986 INFO L388 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 23 treesize of output 22 [2021-11-03 04:20:56,987 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:56,988 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:20:56,988 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:56,988 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:20:56,989 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 04:20:56,989 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:56,990 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:56,991 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:56,992 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:20:56,992 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 04:20:56,992 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-03 04:20:57,007 INFO L180 QuantifierPusher]: treesize reduction 13, result has 87.3 percent of original size [2021-11-03 04:20:57,009 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:20:57,014 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:57,016 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:20:57,017 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:57,020 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:20:57,021 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 88 [2021-11-03 04:20:57,025 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.4 percent of original size [2021-11-03 04:20:57,030 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 95 [2021-11-03 04:20:57,032 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:57,038 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:57,039 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:57,041 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:57,042 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:57,042 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:57,046 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:57,053 INFO L180 QuantifierPusher]: treesize reduction 24, result has 72.4 percent of original size [2021-11-03 04:20:57,056 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 42 [2021-11-03 04:20:57,061 INFO L180 QuantifierPusher]: treesize reduction 24, result has 68.0 percent of original size [2021-11-03 04:20:57,062 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:20:57,063 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:57,064 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 04:20:57,065 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 34 [2021-11-03 04:20:57,068 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:57,070 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 75 [2021-11-03 04:20:57,072 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:57,076 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:57,080 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:57,088 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:57,090 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 132 [2021-11-03 04:20:57,093 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:20:57,097 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 152 [2021-11-03 04:20:57,100 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:57,111 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:57,112 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:57,112 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:57,113 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:57,114 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:57,115 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:57,118 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:57,123 INFO L180 QuantifierPusher]: treesize reduction 24, result has 77.1 percent of original size [2021-11-03 04:20:57,125 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-03 04:20:57,127 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:57,133 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:57,134 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:57,134 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:57,135 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:57,137 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:20:57,142 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:20:57,144 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:20:57,151 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:20:57,154 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:20:57,156 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 04:20:57,982 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 04:20:57,982 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:20:57,982 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 14, 14] total 39 [2021-11-03 04:20:57,982 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1736865945] [2021-11-03 04:20:57,983 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-03 04:20:57,983 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:20:57,983 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-03 04:20:57,984 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=319, Invalid=1937, Unknown=0, NotChecked=0, Total=2256 [2021-11-03 04:20:57,985 INFO L87 Difference]: Start difference. First operand 77 states and 79 transitions. Second operand has 39 states, 39 states have (on average 3.871794871794872) internal successors, (151), 39 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:20:58,954 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:20:58,955 INFO L93 Difference]: Finished difference Result 173 states and 189 transitions. [2021-11-03 04:20:58,955 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-11-03 04:20:58,955 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 3.871794871794872) internal successors, (151), 39 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 76 [2021-11-03 04:20:58,955 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:20:58,956 INFO L225 Difference]: With dead ends: 173 [2021-11-03 04:20:58,956 INFO L226 Difference]: Without dead ends: 122 [2021-11-03 04:20:58,960 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 312 GetRequests, 217 SyntacticMatches, 1 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2902 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1378, Invalid=7742, Unknown=0, NotChecked=0, Total=9120 [2021-11-03 04:20:58,960 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2021-11-03 04:20:58,966 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 83. [2021-11-03 04:20:58,967 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 82 states have (on average 1.0365853658536586) internal successors, (85), 82 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:20:58,967 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 85 transitions. [2021-11-03 04:20:58,968 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 85 transitions. Word has length 76 [2021-11-03 04:20:58,968 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:20:58,968 INFO L470 AbstractCegarLoop]: Abstraction has 83 states and 85 transitions. [2021-11-03 04:20:58,968 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 3.871794871794872) internal successors, (151), 39 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:20:58,969 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 85 transitions. [2021-11-03 04:20:58,969 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-03 04:20:58,969 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:20:58,970 INFO L513 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:20:59,001 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-03 04:20:59,183 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable328,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:20:59,184 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:20:59,184 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:20:59,184 INFO L85 PathProgramCache]: Analyzing trace with hash -1246411120, now seen corresponding path program 13 times [2021-11-03 04:20:59,184 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:20:59,184 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [655808462] [2021-11-03 04:20:59,184 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:20:59,184 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:20:59,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:20:59,541 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 255 proven. 189 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:20:59,542 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:20:59,542 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [655808462] [2021-11-03 04:20:59,542 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [655808462] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:20:59,542 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [961134849] [2021-11-03 04:20:59,542 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-03 04:20:59,542 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:20:59,543 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:20:59,544 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:20:59,565 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-03 04:20:59,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:20:59,998 INFO L263 TraceCheckSpWp]: Trace formula consists of 315 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-03 04:21:00,000 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:21:00,603 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 288 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:21:00,604 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:21:00,864 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 288 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:21:00,866 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [961134849] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:21:00,866 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1311564699] [2021-11-03 04:21:00,873 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-03 04:21:00,873 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:21:00,874 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:21:00,874 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:21:00,874 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:21:00,877 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:00,878 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:21:00,879 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:00,880 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 04:21:00,880 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:21:00,880 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:00,881 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 04:21:00,881 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-03 04:21:00,884 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_20|], 10=[|v_#valid_21|]} [2021-11-03 04:21:00,889 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:21:00,890 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-03 04:21:00,890 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:00,890 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:21:00,891 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:00,891 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:21:00,891 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 04:21:00,891 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:00,893 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:00,895 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:21:00,896 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:21:00,897 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:21:00,903 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:21:00,905 INFO L388 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 23 treesize of output 22 [2021-11-03 04:21:00,905 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:00,906 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:21:00,907 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:00,907 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:21:00,907 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 04:21:00,907 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:00,909 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:00,911 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:00,911 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:21:00,911 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 04:21:00,912 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-03 04:21:00,915 INFO L180 QuantifierPusher]: treesize reduction 13, result has 87.3 percent of original size [2021-11-03 04:21:00,921 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:21:00,923 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:00,925 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:21:00,925 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:00,927 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:21:00,927 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 88 [2021-11-03 04:21:00,929 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.4 percent of original size [2021-11-03 04:21:00,931 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 91 [2021-11-03 04:21:00,933 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:00,937 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:00,938 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:00,938 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:00,939 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:00,940 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:00,942 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:00,946 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:00,949 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 101 [2021-11-03 04:21:00,953 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:00,968 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:00,969 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:00,975 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:00,976 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:00,983 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:00,985 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:00,989 INFO L180 QuantifierPusher]: treesize reduction 24, result has 72.4 percent of original size [2021-11-03 04:21:00,992 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 42 [2021-11-03 04:21:00,997 INFO L180 QuantifierPusher]: treesize reduction 24, result has 68.0 percent of original size [2021-11-03 04:21:00,999 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:21:01,000 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:01,002 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 04:21:01,022 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 34 [2021-11-03 04:21:01,025 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:01,027 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 75 [2021-11-03 04:21:01,029 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:01,032 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:01,036 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:01,042 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:01,044 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 132 [2021-11-03 04:21:01,046 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:01,049 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 152 [2021-11-03 04:21:01,052 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:01,071 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:01,072 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:01,073 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:01,075 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:01,076 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:01,077 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:01,080 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:01,086 INFO L180 QuantifierPusher]: treesize reduction 24, result has 77.1 percent of original size [2021-11-03 04:21:01,089 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-03 04:21:01,091 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:01,098 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:01,099 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:01,100 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:01,101 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:01,103 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:01,108 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:21:01,112 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:21:01,119 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:21:01,122 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:21:01,124 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 04:21:01,869 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 04:21:01,869 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:21:01,869 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 43 [2021-11-03 04:21:01,869 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1763269048] [2021-11-03 04:21:01,870 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2021-11-03 04:21:01,870 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:21:01,870 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-11-03 04:21:01,871 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=477, Invalid=2175, Unknown=0, NotChecked=0, Total=2652 [2021-11-03 04:21:01,871 INFO L87 Difference]: Start difference. First operand 83 states and 85 transitions. Second operand has 43 states, 43 states have (on average 3.2093023255813953) internal successors, (138), 43 states have internal predecessors, (138), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:21:02,203 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:21:02,204 INFO L93 Difference]: Finished difference Result 179 states and 195 transitions. [2021-11-03 04:21:02,204 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-03 04:21:02,204 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 3.2093023255813953) internal successors, (138), 43 states have internal predecessors, (138), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 82 [2021-11-03 04:21:02,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:21:02,205 INFO L225 Difference]: With dead ends: 179 [2021-11-03 04:21:02,205 INFO L226 Difference]: Without dead ends: 124 [2021-11-03 04:21:02,207 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 285 GetRequests, 222 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1150 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=843, Invalid=3317, Unknown=0, NotChecked=0, Total=4160 [2021-11-03 04:21:02,207 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2021-11-03 04:21:02,211 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 85. [2021-11-03 04:21:02,211 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 84 states have (on average 1.0357142857142858) internal successors, (87), 84 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:21:02,212 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 87 transitions. [2021-11-03 04:21:02,212 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 87 transitions. Word has length 82 [2021-11-03 04:21:02,212 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:21:02,212 INFO L470 AbstractCegarLoop]: Abstraction has 85 states and 87 transitions. [2021-11-03 04:21:02,212 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 3.2093023255813953) internal successors, (138), 43 states have internal predecessors, (138), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:21:02,212 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 87 transitions. [2021-11-03 04:21:02,213 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-11-03 04:21:02,213 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:21:02,213 INFO L513 BasicCegarLoop]: trace histogram [14, 13, 13, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:21:02,234 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-03 04:21:02,414 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable355 [2021-11-03 04:21:02,414 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:21:02,414 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:21:02,414 INFO L85 PathProgramCache]: Analyzing trace with hash 1761469621, now seen corresponding path program 14 times [2021-11-03 04:21:02,415 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:21:02,415 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [880000201] [2021-11-03 04:21:02,415 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:21:02,415 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:21:02,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:21:02,629 INFO L134 CoverageAnalysis]: Checked inductivity of 470 backedges. 156 proven. 314 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:21:02,629 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:21:02,629 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [880000201] [2021-11-03 04:21:02,629 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [880000201] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:21:02,629 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1029815769] [2021-11-03 04:21:02,629 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-03 04:21:02,629 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:21:02,629 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:21:02,630 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:21:02,631 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-03 04:21:03,146 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2021-11-03 04:21:03,146 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 04:21:03,148 INFO L263 TraceCheckSpWp]: Trace formula consists of 325 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-03 04:21:03,149 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:21:03,411 INFO L134 CoverageAnalysis]: Checked inductivity of 470 backedges. 182 proven. 288 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:21:03,411 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:21:03,677 INFO L134 CoverageAnalysis]: Checked inductivity of 470 backedges. 182 proven. 288 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:21:03,678 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1029815769] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:21:03,678 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1322339985] [2021-11-03 04:21:03,679 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-03 04:21:03,679 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:21:03,680 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:21:03,680 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:21:03,680 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:21:03,684 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:03,684 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:21:03,685 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:03,685 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 04:21:03,685 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:21:03,686 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:03,686 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 04:21:03,687 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-03 04:21:03,689 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_21|], 10=[|v_#valid_22|]} [2021-11-03 04:21:03,694 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:21:03,695 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-03 04:21:03,695 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:03,696 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:21:03,696 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:03,697 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:21:03,697 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 04:21:03,697 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:03,699 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:03,702 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:21:03,703 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:21:03,704 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:21:03,708 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:21:03,709 INFO L388 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 23 treesize of output 22 [2021-11-03 04:21:03,710 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:03,712 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:21:03,712 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:03,713 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:21:03,713 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 04:21:03,713 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:03,715 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:03,716 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:03,717 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:21:03,717 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 04:21:03,717 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-03 04:21:03,722 INFO L180 QuantifierPusher]: treesize reduction 13, result has 87.3 percent of original size [2021-11-03 04:21:03,724 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:21:03,727 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:03,729 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:21:03,729 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:03,731 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:21:03,732 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 88 [2021-11-03 04:21:03,734 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.4 percent of original size [2021-11-03 04:21:03,737 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 04:21:03,740 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:03,745 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:03,746 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:03,747 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:03,748 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:03,748 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:03,750 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:03,755 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:03,759 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 96 [2021-11-03 04:21:03,761 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:03,767 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:03,768 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:03,769 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:03,769 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:03,770 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:03,772 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:03,775 INFO L180 QuantifierPusher]: treesize reduction 24, result has 72.4 percent of original size [2021-11-03 04:21:03,778 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 42 [2021-11-03 04:21:03,782 INFO L180 QuantifierPusher]: treesize reduction 24, result has 68.0 percent of original size [2021-11-03 04:21:03,783 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:21:03,784 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:03,785 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 04:21:03,786 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 34 [2021-11-03 04:21:03,788 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:03,790 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 73 [2021-11-03 04:21:03,792 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:03,795 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:03,799 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:03,806 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:03,808 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 121 [2021-11-03 04:21:03,811 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:03,814 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 141 [2021-11-03 04:21:03,817 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:03,827 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:03,828 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:03,829 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:03,829 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:03,830 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:03,830 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:03,833 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:03,837 INFO L180 QuantifierPusher]: treesize reduction 24, result has 77.1 percent of original size [2021-11-03 04:21:03,840 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-03 04:21:03,842 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:03,847 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:03,847 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:03,848 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:03,849 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:03,851 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:03,855 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:21:03,857 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:21:03,863 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:21:03,865 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:21:03,867 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 04:21:04,533 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 04:21:04,534 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:21:04,534 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 19 [2021-11-03 04:21:04,534 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [366425928] [2021-11-03 04:21:04,534 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-03 04:21:04,534 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:21:04,535 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-03 04:21:04,535 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=191, Invalid=621, Unknown=0, NotChecked=0, Total=812 [2021-11-03 04:21:04,535 INFO L87 Difference]: Start difference. First operand 85 states and 87 transitions. Second operand has 20 states, 20 states have (on average 5.25) internal successors, (105), 19 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:21:04,771 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:21:04,772 INFO L93 Difference]: Finished difference Result 102 states and 105 transitions. [2021-11-03 04:21:04,776 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-03 04:21:04,777 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 5.25) internal successors, (105), 19 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 84 [2021-11-03 04:21:04,777 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:21:04,778 INFO L225 Difference]: With dead ends: 102 [2021-11-03 04:21:04,778 INFO L226 Difference]: Without dead ends: 100 [2021-11-03 04:21:04,779 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 294 GetRequests, 250 SyntacticMatches, 1 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 571 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=500, Invalid=1480, Unknown=0, NotChecked=0, Total=1980 [2021-11-03 04:21:04,779 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2021-11-03 04:21:04,785 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 93. [2021-11-03 04:21:04,786 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 92 states have (on average 1.0326086956521738) internal successors, (95), 92 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:21:04,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 95 transitions. [2021-11-03 04:21:04,787 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 95 transitions. Word has length 84 [2021-11-03 04:21:04,787 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:21:04,787 INFO L470 AbstractCegarLoop]: Abstraction has 93 states and 95 transitions. [2021-11-03 04:21:04,788 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 5.25) internal successors, (105), 19 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:21:04,788 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 95 transitions. [2021-11-03 04:21:04,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2021-11-03 04:21:04,789 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:21:04,789 INFO L513 BasicCegarLoop]: trace histogram [15, 14, 14, 14, 14, 13, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:21:04,815 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-03 04:21:04,995 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable389 [2021-11-03 04:21:04,996 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:21:04,996 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:21:04,996 INFO L85 PathProgramCache]: Analyzing trace with hash -1928810085, now seen corresponding path program 15 times [2021-11-03 04:21:04,996 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:21:04,996 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [619251109] [2021-11-03 04:21:04,996 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:21:04,996 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:21:05,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:21:05,407 INFO L134 CoverageAnalysis]: Checked inductivity of 574 backedges. 353 proven. 221 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:21:05,407 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:21:05,407 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [619251109] [2021-11-03 04:21:05,407 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [619251109] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:21:05,407 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2077737170] [2021-11-03 04:21:05,408 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-03 04:21:05,408 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:21:05,408 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:21:05,412 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:21:05,430 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-03 04:21:05,958 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-03 04:21:05,958 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 04:21:05,960 INFO L263 TraceCheckSpWp]: Trace formula consists of 349 conjuncts, 31 conjunts are in the unsatisfiable core [2021-11-03 04:21:05,961 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:21:06,795 INFO L134 CoverageAnalysis]: Checked inductivity of 574 backedges. 392 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:21:06,796 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:21:07,102 INFO L134 CoverageAnalysis]: Checked inductivity of 574 backedges. 392 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:21:07,102 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2077737170] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:21:07,102 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2110186741] [2021-11-03 04:21:07,104 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-03 04:21:07,104 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:21:07,105 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:21:07,105 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:21:07,105 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:21:07,131 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:07,132 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:21:07,133 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:07,133 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 04:21:07,134 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:21:07,134 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:07,135 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 04:21:07,136 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-03 04:21:07,138 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_22|], 10=[|v_#valid_23|]} [2021-11-03 04:21:07,143 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:21:07,144 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-03 04:21:07,145 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:07,145 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:21:07,145 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:07,146 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:21:07,146 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 04:21:07,147 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:07,148 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:07,151 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:21:07,152 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:21:07,153 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:21:07,156 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:21:07,158 INFO L388 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 23 treesize of output 22 [2021-11-03 04:21:07,158 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:07,159 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:21:07,160 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:07,160 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:21:07,160 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 04:21:07,160 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:07,162 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:07,163 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:07,164 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:21:07,165 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 04:21:07,165 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-03 04:21:07,169 INFO L180 QuantifierPusher]: treesize reduction 13, result has 87.3 percent of original size [2021-11-03 04:21:07,170 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:21:07,172 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:07,174 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:21:07,174 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:07,176 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:21:07,177 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 88 [2021-11-03 04:21:07,180 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.4 percent of original size [2021-11-03 04:21:07,186 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 95 [2021-11-03 04:21:07,189 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:07,194 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:07,195 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:07,196 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:07,197 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:07,198 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:07,200 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:07,204 INFO L180 QuantifierPusher]: treesize reduction 24, result has 72.4 percent of original size [2021-11-03 04:21:07,208 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 42 [2021-11-03 04:21:07,213 INFO L180 QuantifierPusher]: treesize reduction 24, result has 68.0 percent of original size [2021-11-03 04:21:07,215 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:21:07,215 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:07,217 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 04:21:07,217 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 34 [2021-11-03 04:21:07,220 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:07,222 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 73 [2021-11-03 04:21:07,225 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:07,228 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:07,232 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:07,240 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:07,242 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 121 [2021-11-03 04:21:07,245 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:07,248 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 141 [2021-11-03 04:21:07,251 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:07,261 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:07,262 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:07,263 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:07,263 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:07,264 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:07,265 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:07,271 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:07,275 INFO L180 QuantifierPusher]: treesize reduction 24, result has 77.1 percent of original size [2021-11-03 04:21:07,277 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-03 04:21:07,281 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:07,285 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:07,286 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:07,287 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:07,287 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:07,288 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:07,291 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:21:07,293 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:21:07,300 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:21:07,302 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:21:07,304 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 04:21:08,045 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 04:21:08,045 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:21:08,045 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 50 [2021-11-03 04:21:08,045 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1314786667] [2021-11-03 04:21:08,046 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2021-11-03 04:21:08,046 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:21:08,047 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-11-03 04:21:08,048 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=638, Invalid=2784, Unknown=0, NotChecked=0, Total=3422 [2021-11-03 04:21:08,048 INFO L87 Difference]: Start difference. First operand 93 states and 95 transitions. Second operand has 50 states, 50 states have (on average 3.3) internal successors, (165), 50 states have internal predecessors, (165), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:21:08,721 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:21:08,722 INFO L93 Difference]: Finished difference Result 260 states and 279 transitions. [2021-11-03 04:21:08,722 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-11-03 04:21:08,722 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 3.3) internal successors, (165), 50 states have internal predecessors, (165), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 92 [2021-11-03 04:21:08,722 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:21:08,723 INFO L225 Difference]: With dead ends: 260 [2021-11-03 04:21:08,723 INFO L226 Difference]: Without dead ends: 142 [2021-11-03 04:21:08,726 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 334 GetRequests, 248 SyntacticMatches, 0 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2126 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1582, Invalid=6074, Unknown=0, NotChecked=0, Total=7656 [2021-11-03 04:21:08,727 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2021-11-03 04:21:08,732 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 97. [2021-11-03 04:21:08,732 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 96 states have (on average 1.03125) internal successors, (99), 96 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:21:08,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 99 transitions. [2021-11-03 04:21:08,733 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 99 transitions. Word has length 92 [2021-11-03 04:21:08,733 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:21:08,733 INFO L470 AbstractCegarLoop]: Abstraction has 97 states and 99 transitions. [2021-11-03 04:21:08,734 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 3.3) internal successors, (165), 50 states have internal predecessors, (165), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:21:08,734 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 99 transitions. [2021-11-03 04:21:08,734 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2021-11-03 04:21:08,735 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:21:08,735 INFO L513 BasicCegarLoop]: trace histogram [16, 15, 15, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:21:08,782 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-03 04:21:08,959 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable423,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:21:08,960 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:21:08,960 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:21:08,960 INFO L85 PathProgramCache]: Analyzing trace with hash -806538203, now seen corresponding path program 16 times [2021-11-03 04:21:08,960 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:21:08,960 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [557931866] [2021-11-03 04:21:08,960 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:21:08,960 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:21:09,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:21:09,246 INFO L134 CoverageAnalysis]: Checked inductivity of 632 backedges. 210 proven. 422 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:21:09,246 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:21:09,246 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [557931866] [2021-11-03 04:21:09,247 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [557931866] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:21:09,247 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2146125964] [2021-11-03 04:21:09,247 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-03 04:21:09,247 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:21:09,247 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:21:09,252 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:21:09,270 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-03 04:21:09,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:21:09,906 INFO L263 TraceCheckSpWp]: Trace formula consists of 369 conjuncts, 33 conjunts are in the unsatisfiable core [2021-11-03 04:21:09,907 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:21:10,191 INFO L134 CoverageAnalysis]: Checked inductivity of 632 backedges. 240 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:21:10,192 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:21:10,454 INFO L134 CoverageAnalysis]: Checked inductivity of 632 backedges. 240 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:21:10,454 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2146125964] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:21:10,454 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1905799459] [2021-11-03 04:21:10,455 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-03 04:21:10,456 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:21:10,456 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:21:10,456 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:21:10,456 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:21:10,464 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:10,465 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:21:10,465 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:10,465 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 04:21:10,466 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:21:10,467 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:10,467 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 04:21:10,468 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-03 04:21:10,470 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_23|], 10=[|v_#valid_24|]} [2021-11-03 04:21:10,474 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:21:10,475 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-03 04:21:10,475 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:10,475 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:21:10,476 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:10,476 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:21:10,476 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 04:21:10,476 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:10,478 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:10,480 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:21:10,481 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:21:10,481 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:21:10,484 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:21:10,485 INFO L388 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 23 treesize of output 22 [2021-11-03 04:21:10,485 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:10,486 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:21:10,487 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:10,487 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:21:10,487 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 04:21:10,487 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:10,489 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:10,489 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:10,490 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:21:10,490 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 04:21:10,490 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-03 04:21:10,493 INFO L180 QuantifierPusher]: treesize reduction 13, result has 87.3 percent of original size [2021-11-03 04:21:10,494 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:21:10,496 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:10,504 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:21:10,505 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:10,506 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:21:10,520 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 88 [2021-11-03 04:21:10,523 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.4 percent of original size [2021-11-03 04:21:10,526 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 97 [2021-11-03 04:21:10,529 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:10,534 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:10,536 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:10,537 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:10,538 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:10,539 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:10,541 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:10,544 INFO L180 QuantifierPusher]: treesize reduction 24, result has 72.4 percent of original size [2021-11-03 04:21:10,547 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 42 [2021-11-03 04:21:10,551 INFO L180 QuantifierPusher]: treesize reduction 24, result has 68.0 percent of original size [2021-11-03 04:21:10,553 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:21:10,553 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:10,555 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 04:21:10,555 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 34 [2021-11-03 04:21:10,561 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:10,563 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 73 [2021-11-03 04:21:10,565 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:10,569 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:10,572 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:10,579 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:10,582 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 132 [2021-11-03 04:21:10,602 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:10,605 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 152 [2021-11-03 04:21:10,608 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:10,620 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:10,621 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:10,622 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:10,623 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:10,624 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:10,624 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:10,628 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:10,633 INFO L180 QuantifierPusher]: treesize reduction 24, result has 77.1 percent of original size [2021-11-03 04:21:10,636 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-03 04:21:10,638 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:10,643 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:10,644 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:10,645 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:10,645 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:10,647 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:10,653 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:21:10,655 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:21:10,663 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:21:10,666 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:21:10,668 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 04:21:11,254 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 04:21:11,255 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:21:11,255 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 21 [2021-11-03 04:21:11,255 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1373175696] [2021-11-03 04:21:11,255 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-03 04:21:11,256 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:21:11,256 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-03 04:21:11,256 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=226, Invalid=704, Unknown=0, NotChecked=0, Total=930 [2021-11-03 04:21:11,257 INFO L87 Difference]: Start difference. First operand 97 states and 99 transitions. Second operand has 22 states, 22 states have (on average 5.318181818181818) internal successors, (117), 21 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:21:11,613 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:21:11,613 INFO L93 Difference]: Finished difference Result 114 states and 117 transitions. [2021-11-03 04:21:11,614 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-11-03 04:21:11,614 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 5.318181818181818) internal successors, (117), 21 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 96 [2021-11-03 04:21:11,614 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:21:11,615 INFO L225 Difference]: With dead ends: 114 [2021-11-03 04:21:11,615 INFO L226 Difference]: Without dead ends: 112 [2021-11-03 04:21:11,616 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 336 GetRequests, 288 SyntacticMatches, 1 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 679 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=609, Invalid=1743, Unknown=0, NotChecked=0, Total=2352 [2021-11-03 04:21:11,616 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2021-11-03 04:21:11,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 105. [2021-11-03 04:21:11,623 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 105 states, 104 states have (on average 1.0288461538461537) internal successors, (107), 104 states have internal predecessors, (107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:21:11,624 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 107 transitions. [2021-11-03 04:21:11,624 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 107 transitions. Word has length 96 [2021-11-03 04:21:11,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:21:11,624 INFO L470 AbstractCegarLoop]: Abstraction has 105 states and 107 transitions. [2021-11-03 04:21:11,625 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 5.318181818181818) internal successors, (117), 21 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:21:11,625 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 107 transitions. [2021-11-03 04:21:11,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2021-11-03 04:21:11,626 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:21:11,626 INFO L513 BasicCegarLoop]: trace histogram [17, 16, 16, 16, 16, 15, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:21:11,665 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-03 04:21:11,847 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable450,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:21:11,848 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:21:11,848 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:21:11,848 INFO L85 PathProgramCache]: Analyzing trace with hash -1859546869, now seen corresponding path program 17 times [2021-11-03 04:21:11,848 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:21:11,848 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [94510279] [2021-11-03 04:21:11,848 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:21:11,848 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:21:11,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:21:12,347 INFO L134 CoverageAnalysis]: Checked inductivity of 752 backedges. 467 proven. 285 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:21:12,348 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:21:12,348 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [94510279] [2021-11-03 04:21:12,348 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [94510279] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:21:12,348 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [329213925] [2021-11-03 04:21:12,348 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-03 04:21:12,348 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:21:12,348 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:21:12,352 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:21:12,374 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-03 04:21:13,282 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2021-11-03 04:21:13,282 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 04:21:13,285 INFO L263 TraceCheckSpWp]: Trace formula consists of 393 conjuncts, 35 conjunts are in the unsatisfiable core [2021-11-03 04:21:13,287 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:21:14,233 INFO L134 CoverageAnalysis]: Checked inductivity of 752 backedges. 512 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:21:14,234 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:21:14,561 INFO L134 CoverageAnalysis]: Checked inductivity of 752 backedges. 512 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:21:14,562 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [329213925] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:21:14,562 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1212991653] [2021-11-03 04:21:14,564 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-03 04:21:14,564 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:21:14,565 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:21:14,565 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:21:14,565 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:21:14,570 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:14,570 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:21:14,571 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:14,571 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 04:21:14,572 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:21:14,573 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:14,573 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 04:21:14,574 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-03 04:21:14,577 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_24|], 10=[|v_#valid_25|]} [2021-11-03 04:21:14,582 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:21:14,583 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-03 04:21:14,584 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:14,584 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:21:14,585 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:14,585 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:21:14,585 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 04:21:14,586 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:14,588 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:14,591 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:21:14,592 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:21:14,593 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:21:14,597 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:21:14,599 INFO L388 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 23 treesize of output 22 [2021-11-03 04:21:14,600 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:14,601 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:21:14,602 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:14,602 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:21:14,602 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 04:21:14,603 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:14,605 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:14,606 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:14,608 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:21:14,608 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 04:21:14,608 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-03 04:21:14,614 INFO L180 QuantifierPusher]: treesize reduction 13, result has 87.3 percent of original size [2021-11-03 04:21:14,615 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:21:14,618 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:14,621 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:21:14,621 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:14,623 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:21:14,624 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 88 [2021-11-03 04:21:14,626 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.4 percent of original size [2021-11-03 04:21:14,629 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 95 [2021-11-03 04:21:14,631 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:14,637 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:14,638 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:14,639 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:14,640 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:14,640 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:14,642 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:14,647 INFO L180 QuantifierPusher]: treesize reduction 24, result has 72.4 percent of original size [2021-11-03 04:21:14,649 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 42 [2021-11-03 04:21:14,653 INFO L180 QuantifierPusher]: treesize reduction 24, result has 68.0 percent of original size [2021-11-03 04:21:14,655 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:21:14,655 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:14,657 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 04:21:14,658 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 34 [2021-11-03 04:21:14,660 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:14,662 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 75 [2021-11-03 04:21:14,664 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:14,668 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:14,673 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:14,680 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:14,682 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 132 [2021-11-03 04:21:14,685 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:14,688 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 152 [2021-11-03 04:21:14,691 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:14,701 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:14,703 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:14,703 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:14,704 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:14,705 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:14,706 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:14,711 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:14,714 INFO L180 QuantifierPusher]: treesize reduction 24, result has 77.1 percent of original size [2021-11-03 04:21:14,716 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-03 04:21:14,717 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:14,721 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:14,721 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:14,722 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:14,722 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:14,725 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:14,729 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:21:14,731 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:21:14,735 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:21:14,739 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:21:14,741 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 04:21:15,546 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 04:21:15,546 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:21:15,546 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 56 [2021-11-03 04:21:15,546 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1963737079] [2021-11-03 04:21:15,547 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2021-11-03 04:21:15,547 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:21:15,548 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2021-11-03 04:21:15,548 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=786, Invalid=3374, Unknown=0, NotChecked=0, Total=4160 [2021-11-03 04:21:15,549 INFO L87 Difference]: Start difference. First operand 105 states and 107 transitions. Second operand has 56 states, 56 states have (on average 3.3035714285714284) internal successors, (185), 56 states have internal predecessors, (185), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:21:16,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:21:16,308 INFO L93 Difference]: Finished difference Result 294 states and 315 transitions. [2021-11-03 04:21:16,308 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-11-03 04:21:16,308 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 3.3035714285714284) internal successors, (185), 56 states have internal predecessors, (185), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 104 [2021-11-03 04:21:16,309 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:21:16,309 INFO L225 Difference]: With dead ends: 294 [2021-11-03 04:21:16,310 INFO L226 Difference]: Without dead ends: 160 [2021-11-03 04:21:16,311 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 378 GetRequests, 282 SyntacticMatches, 0 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2614 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1992, Invalid=7514, Unknown=0, NotChecked=0, Total=9506 [2021-11-03 04:21:16,311 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2021-11-03 04:21:16,318 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 109. [2021-11-03 04:21:16,318 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109 states, 108 states have (on average 1.0277777777777777) internal successors, (111), 108 states have internal predecessors, (111), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:21:16,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 111 transitions. [2021-11-03 04:21:16,319 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 111 transitions. Word has length 104 [2021-11-03 04:21:16,319 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:21:16,319 INFO L470 AbstractCegarLoop]: Abstraction has 109 states and 111 transitions. [2021-11-03 04:21:16,319 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 56 states have (on average 3.3035714285714284) internal successors, (185), 56 states have internal predecessors, (185), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:21:16,319 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 111 transitions. [2021-11-03 04:21:16,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2021-11-03 04:21:16,320 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:21:16,320 INFO L513 BasicCegarLoop]: trace histogram [18, 17, 17, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:21:16,342 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-03 04:21:16,520 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable477 [2021-11-03 04:21:16,521 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:21:16,521 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:21:16,521 INFO L85 PathProgramCache]: Analyzing trace with hash -1174629227, now seen corresponding path program 18 times [2021-11-03 04:21:16,521 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:21:16,521 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [972980057] [2021-11-03 04:21:16,521 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:21:16,521 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:21:16,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:21:16,771 INFO L134 CoverageAnalysis]: Checked inductivity of 818 backedges. 272 proven. 546 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:21:16,772 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:21:16,772 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [972980057] [2021-11-03 04:21:16,772 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [972980057] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:21:16,772 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [456844176] [2021-11-03 04:21:16,772 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-03 04:21:16,772 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:21:16,772 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:21:16,773 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:21:16,774 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-03 04:21:17,519 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-03 04:21:17,519 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 04:21:17,521 INFO L263 TraceCheckSpWp]: Trace formula consists of 413 conjuncts, 37 conjunts are in the unsatisfiable core [2021-11-03 04:21:17,523 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:21:17,800 INFO L134 CoverageAnalysis]: Checked inductivity of 818 backedges. 306 proven. 512 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:21:17,800 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:21:18,071 INFO L134 CoverageAnalysis]: Checked inductivity of 818 backedges. 306 proven. 512 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:21:18,071 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [456844176] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:21:18,071 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [180790023] [2021-11-03 04:21:18,073 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-03 04:21:18,073 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:21:18,073 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:21:18,074 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:21:18,074 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:21:18,084 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:18,085 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:21:18,086 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:18,086 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 04:21:18,087 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:21:18,087 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:18,087 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 04:21:18,088 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-03 04:21:18,100 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_25|], 10=[|v_#valid_26|]} [2021-11-03 04:21:18,104 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:21:18,105 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-03 04:21:18,105 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:18,106 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:21:18,106 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:18,106 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:21:18,107 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 04:21:18,107 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:18,109 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:18,112 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:21:18,113 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:21:18,114 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:21:18,118 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:21:18,120 INFO L388 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 23 treesize of output 22 [2021-11-03 04:21:18,121 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:18,123 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:21:18,123 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:18,124 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:21:18,124 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 04:21:18,124 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:18,126 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:18,128 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:18,129 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:21:18,129 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 04:21:18,129 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-03 04:21:18,134 INFO L180 QuantifierPusher]: treesize reduction 13, result has 87.3 percent of original size [2021-11-03 04:21:18,136 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:21:18,139 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:18,141 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:21:18,142 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:18,144 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:21:18,145 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 88 [2021-11-03 04:21:18,148 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.4 percent of original size [2021-11-03 04:21:18,151 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 95 [2021-11-03 04:21:18,154 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:18,159 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:18,160 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:18,161 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:18,162 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:18,168 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:18,170 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:18,174 INFO L180 QuantifierPusher]: treesize reduction 24, result has 72.4 percent of original size [2021-11-03 04:21:18,177 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 42 [2021-11-03 04:21:18,181 INFO L180 QuantifierPusher]: treesize reduction 24, result has 68.0 percent of original size [2021-11-03 04:21:18,183 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:21:18,183 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:18,185 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 04:21:18,186 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 34 [2021-11-03 04:21:18,188 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:18,190 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 75 [2021-11-03 04:21:18,193 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:18,196 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:18,200 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:18,208 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:18,212 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 132 [2021-11-03 04:21:18,214 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:18,216 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 152 [2021-11-03 04:21:18,219 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:18,227 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:18,228 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:18,229 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:18,230 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:18,231 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:18,231 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:18,234 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:18,237 INFO L180 QuantifierPusher]: treesize reduction 24, result has 77.1 percent of original size [2021-11-03 04:21:18,240 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-03 04:21:18,242 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:18,245 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:18,245 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:18,246 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:18,246 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:18,248 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:18,250 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:21:18,252 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:21:18,257 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:21:18,258 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:21:18,260 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 04:21:18,866 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 04:21:18,867 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:21:18,867 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 23 [2021-11-03 04:21:18,867 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1890700107] [2021-11-03 04:21:18,867 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-03 04:21:18,868 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:21:18,868 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-03 04:21:18,868 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=265, Invalid=791, Unknown=0, NotChecked=0, Total=1056 [2021-11-03 04:21:18,869 INFO L87 Difference]: Start difference. First operand 109 states and 111 transitions. Second operand has 24 states, 24 states have (on average 5.375) internal successors, (129), 23 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:21:19,170 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:21:19,170 INFO L93 Difference]: Finished difference Result 126 states and 129 transitions. [2021-11-03 04:21:19,171 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-11-03 04:21:19,171 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 5.375) internal successors, (129), 23 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 108 [2021-11-03 04:21:19,171 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:21:19,172 INFO L225 Difference]: With dead ends: 126 [2021-11-03 04:21:19,172 INFO L226 Difference]: Without dead ends: 124 [2021-11-03 04:21:19,173 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 378 GetRequests, 326 SyntacticMatches, 1 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 795 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=730, Invalid=2026, Unknown=0, NotChecked=0, Total=2756 [2021-11-03 04:21:19,173 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2021-11-03 04:21:19,180 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 117. [2021-11-03 04:21:19,180 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117 states, 116 states have (on average 1.0258620689655173) internal successors, (119), 116 states have internal predecessors, (119), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:21:19,181 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 119 transitions. [2021-11-03 04:21:19,181 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 119 transitions. Word has length 108 [2021-11-03 04:21:19,181 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:21:19,182 INFO L470 AbstractCegarLoop]: Abstraction has 117 states and 119 transitions. [2021-11-03 04:21:19,182 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 5.375) internal successors, (129), 23 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:21:19,182 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 119 transitions. [2021-11-03 04:21:19,183 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2021-11-03 04:21:19,183 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:21:19,183 INFO L513 BasicCegarLoop]: trace histogram [19, 18, 18, 18, 18, 17, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:21:19,208 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-03 04:21:19,391 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable504 [2021-11-03 04:21:19,392 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:21:19,392 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:21:19,392 INFO L85 PathProgramCache]: Analyzing trace with hash -2083946117, now seen corresponding path program 19 times [2021-11-03 04:21:19,392 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:21:19,392 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [747432282] [2021-11-03 04:21:19,392 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:21:19,393 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:21:19,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:21:19,984 INFO L134 CoverageAnalysis]: Checked inductivity of 954 backedges. 597 proven. 357 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:21:19,984 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:21:19,984 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [747432282] [2021-11-03 04:21:19,985 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [747432282] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:21:19,985 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1295033948] [2021-11-03 04:21:19,985 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-03 04:21:19,985 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:21:19,985 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:21:19,986 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:21:19,991 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-03 04:21:21,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:21:21,038 INFO L263 TraceCheckSpWp]: Trace formula consists of 437 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-03 04:21:21,040 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:21:22,002 INFO L134 CoverageAnalysis]: Checked inductivity of 954 backedges. 646 proven. 306 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-03 04:21:22,002 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:21:22,328 INFO L134 CoverageAnalysis]: Checked inductivity of 954 backedges. 646 proven. 306 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-03 04:21:22,328 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1295033948] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:21:22,328 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [806843208] [2021-11-03 04:21:22,330 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-03 04:21:22,330 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:21:22,330 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:21:22,331 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:21:22,331 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:21:22,341 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:22,342 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:21:22,343 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:22,343 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 04:21:22,343 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:21:22,344 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:22,344 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 04:21:22,345 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-03 04:21:22,349 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_26|], 10=[|v_#valid_27|]} [2021-11-03 04:21:22,355 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:21:22,356 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-03 04:21:22,356 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:22,357 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:21:22,357 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:22,357 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:21:22,357 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 04:21:22,358 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:22,359 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:22,362 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:21:22,363 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:21:22,363 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:21:22,366 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:21:22,368 INFO L388 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 23 treesize of output 22 [2021-11-03 04:21:22,369 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:22,370 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:21:22,371 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:22,371 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:21:22,371 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 04:21:22,371 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:22,373 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:22,374 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:22,375 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:21:22,375 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 04:21:22,375 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-03 04:21:22,379 INFO L180 QuantifierPusher]: treesize reduction 13, result has 87.3 percent of original size [2021-11-03 04:21:22,380 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:21:22,384 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:22,386 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:21:22,386 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:22,388 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:21:22,389 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 88 [2021-11-03 04:21:22,404 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.4 percent of original size [2021-11-03 04:21:22,407 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 04:21:22,410 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:22,414 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:22,415 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:22,416 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:22,416 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:22,417 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:22,419 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:22,422 INFO L180 QuantifierPusher]: treesize reduction 24, result has 72.4 percent of original size [2021-11-03 04:21:22,426 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 42 [2021-11-03 04:21:22,429 INFO L180 QuantifierPusher]: treesize reduction 24, result has 68.0 percent of original size [2021-11-03 04:21:22,430 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:21:22,431 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:22,432 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 04:21:22,432 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 34 [2021-11-03 04:21:22,434 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:22,436 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 75 [2021-11-03 04:21:22,438 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:22,441 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:22,456 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:22,462 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:22,464 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 132 [2021-11-03 04:21:22,466 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:22,468 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 152 [2021-11-03 04:21:22,471 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:22,479 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:22,480 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:22,480 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:22,481 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:22,481 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:22,482 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:22,484 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:22,487 INFO L180 QuantifierPusher]: treesize reduction 24, result has 77.1 percent of original size [2021-11-03 04:21:22,489 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-03 04:21:22,491 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:22,495 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:22,496 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:22,496 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:22,497 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:22,498 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:22,501 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:21:22,504 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:21:22,512 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:21:22,519 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:21:22,521 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 04:21:23,431 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 04:21:23,431 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:21:23,431 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 38, 38] total 59 [2021-11-03 04:21:23,431 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1477138611] [2021-11-03 04:21:23,432 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2021-11-03 04:21:23,432 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:21:23,433 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2021-11-03 04:21:23,433 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=847, Invalid=3709, Unknown=0, NotChecked=0, Total=4556 [2021-11-03 04:21:23,433 INFO L87 Difference]: Start difference. First operand 117 states and 119 transitions. Second operand has 59 states, 59 states have (on average 3.3220338983050848) internal successors, (196), 59 states have internal predecessors, (196), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:21:23,992 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:21:23,993 INFO L93 Difference]: Finished difference Result 250 states and 271 transitions. [2021-11-03 04:21:23,993 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-11-03 04:21:23,993 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 3.3220338983050848) internal successors, (196), 59 states have internal predecessors, (196), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 116 [2021-11-03 04:21:23,994 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:21:23,995 INFO L225 Difference]: With dead ends: 250 [2021-11-03 04:21:23,995 INFO L226 Difference]: Without dead ends: 173 [2021-11-03 04:21:23,996 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 403 GetRequests, 319 SyntacticMatches, 0 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1968 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1533, Invalid=5777, Unknown=0, NotChecked=0, Total=7310 [2021-11-03 04:21:23,996 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2021-11-03 04:21:24,004 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 119. [2021-11-03 04:21:24,005 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119 states, 118 states have (on average 1.0254237288135593) internal successors, (121), 118 states have internal predecessors, (121), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:21:24,006 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 121 transitions. [2021-11-03 04:21:24,006 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 121 transitions. Word has length 116 [2021-11-03 04:21:24,006 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:21:24,006 INFO L470 AbstractCegarLoop]: Abstraction has 119 states and 121 transitions. [2021-11-03 04:21:24,007 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 59 states, 59 states have (on average 3.3220338983050848) internal successors, (196), 59 states have internal predecessors, (196), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:21:24,007 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 121 transitions. [2021-11-03 04:21:24,007 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2021-11-03 04:21:24,008 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:21:24,008 INFO L513 BasicCegarLoop]: trace histogram [19, 19, 18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:21:24,031 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-03 04:21:24,211 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable531 [2021-11-03 04:21:24,212 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:21:24,212 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:21:24,212 INFO L85 PathProgramCache]: Analyzing trace with hash 146691680, now seen corresponding path program 20 times [2021-11-03 04:21:24,212 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:21:24,212 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1940995416] [2021-11-03 04:21:24,212 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:21:24,212 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:21:24,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:21:24,842 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 597 proven. 393 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:21:24,843 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:21:24,843 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1940995416] [2021-11-03 04:21:24,843 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1940995416] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:21:24,843 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [537575302] [2021-11-03 04:21:24,843 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-03 04:21:24,843 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:21:24,843 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:21:24,848 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:21:24,866 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-03 04:21:25,861 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 19 check-sat command(s) [2021-11-03 04:21:25,861 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 04:21:25,863 INFO L263 TraceCheckSpWp]: Trace formula consists of 447 conjuncts, 40 conjunts are in the unsatisfiable core [2021-11-03 04:21:25,865 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:21:26,605 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 342 proven. 648 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:21:26,605 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:21:26,953 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 342 proven. 648 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:21:26,953 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [537575302] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:21:26,953 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [151788776] [2021-11-03 04:21:26,954 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-03 04:21:26,954 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:21:26,955 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:21:26,955 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:21:26,955 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:21:26,965 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:26,966 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:21:26,966 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:26,967 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 04:21:26,967 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:21:26,968 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:26,968 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 04:21:26,969 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-03 04:21:26,971 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_27|], 10=[|v_#valid_28|]} [2021-11-03 04:21:26,978 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:21:26,979 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-03 04:21:26,979 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:26,980 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:21:26,980 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:26,980 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:21:26,981 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 04:21:26,981 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:26,983 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:26,985 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:21:26,986 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:21:26,987 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:21:26,990 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:21:26,993 INFO L388 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 23 treesize of output 22 [2021-11-03 04:21:26,994 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:26,995 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:21:26,996 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:26,996 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:21:26,996 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 04:21:26,997 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:26,998 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:26,999 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:27,000 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:21:27,001 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 04:21:27,001 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-03 04:21:27,005 INFO L180 QuantifierPusher]: treesize reduction 13, result has 87.3 percent of original size [2021-11-03 04:21:27,007 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:21:27,010 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:27,014 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:21:27,015 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:27,016 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:21:27,017 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 88 [2021-11-03 04:21:27,020 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.4 percent of original size [2021-11-03 04:21:27,023 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 04:21:27,025 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:27,030 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:27,031 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:27,032 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:27,034 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:27,035 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:27,037 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:27,042 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:27,046 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 96 [2021-11-03 04:21:27,048 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:27,054 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:27,055 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:27,056 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:27,056 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:27,057 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:27,058 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:27,065 INFO L180 QuantifierPusher]: treesize reduction 24, result has 72.4 percent of original size [2021-11-03 04:21:27,068 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 42 [2021-11-03 04:21:27,072 INFO L180 QuantifierPusher]: treesize reduction 24, result has 68.0 percent of original size [2021-11-03 04:21:27,074 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:21:27,075 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:27,076 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 04:21:27,077 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 34 [2021-11-03 04:21:27,079 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:27,081 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-03 04:21:27,083 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:27,086 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:27,091 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:27,102 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:27,104 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 121 [2021-11-03 04:21:27,107 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:27,109 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 141 [2021-11-03 04:21:27,112 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:27,123 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:27,124 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:27,125 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:27,125 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:27,126 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:27,126 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:27,129 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:27,133 INFO L180 QuantifierPusher]: treesize reduction 24, result has 77.1 percent of original size [2021-11-03 04:21:27,135 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-03 04:21:27,137 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:27,142 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:27,143 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:27,143 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:27,144 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:27,145 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:27,149 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:21:27,151 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:21:27,157 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:21:27,159 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:21:27,161 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 04:21:28,115 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 04:21:28,115 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:21:28,115 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 21, 21] total 60 [2021-11-03 04:21:28,115 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [930322713] [2021-11-03 04:21:28,116 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2021-11-03 04:21:28,116 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:21:28,116 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2021-11-03 04:21:28,117 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=683, Invalid=4009, Unknown=0, NotChecked=0, Total=4692 [2021-11-03 04:21:28,117 INFO L87 Difference]: Start difference. First operand 119 states and 121 transitions. Second operand has 60 states, 60 states have (on average 3.9166666666666665) internal successors, (235), 60 states have internal predecessors, (235), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:21:30,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:21:30,062 INFO L93 Difference]: Finished difference Result 264 states and 287 transitions. [2021-11-03 04:21:30,063 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2021-11-03 04:21:30,063 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 60 states have (on average 3.9166666666666665) internal successors, (235), 60 states have internal predecessors, (235), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 118 [2021-11-03 04:21:30,064 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:21:30,065 INFO L225 Difference]: With dead ends: 264 [2021-11-03 04:21:30,065 INFO L226 Difference]: Without dead ends: 185 [2021-11-03 04:21:30,068 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 487 GetRequests, 343 SyntacticMatches, 1 SemanticMatches, 143 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6934 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=3156, Invalid=17724, Unknown=0, NotChecked=0, Total=20880 [2021-11-03 04:21:30,068 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 185 states. [2021-11-03 04:21:30,078 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 185 to 125. [2021-11-03 04:21:30,079 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 124 states have (on average 1.0241935483870968) internal successors, (127), 124 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:21:30,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 127 transitions. [2021-11-03 04:21:30,081 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 127 transitions. Word has length 118 [2021-11-03 04:21:30,082 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:21:30,082 INFO L470 AbstractCegarLoop]: Abstraction has 125 states and 127 transitions. [2021-11-03 04:21:30,082 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 60 states, 60 states have (on average 3.9166666666666665) internal successors, (235), 60 states have internal predecessors, (235), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:21:30,083 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 127 transitions. [2021-11-03 04:21:30,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2021-11-03 04:21:30,083 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:21:30,084 INFO L513 BasicCegarLoop]: trace histogram [20, 20, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:21:30,128 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-03 04:21:30,307 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable558,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:21:30,308 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:21:30,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:21:30,308 INFO L85 PathProgramCache]: Analyzing trace with hash 1021193528, now seen corresponding path program 21 times [2021-11-03 04:21:30,308 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:21:30,308 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [882607728] [2021-11-03 04:21:30,308 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:21:30,309 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:21:30,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:21:31,081 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 668 proven. 434 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:21:31,081 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:21:31,081 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [882607728] [2021-11-03 04:21:31,082 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [882607728] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:21:31,082 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2127070436] [2021-11-03 04:21:31,082 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-03 04:21:31,082 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:21:31,082 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:21:31,084 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:21:31,109 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-03 04:21:32,123 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-03 04:21:32,123 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 04:21:32,125 INFO L263 TraceCheckSpWp]: Trace formula consists of 469 conjuncts, 42 conjunts are in the unsatisfiable core [2021-11-03 04:21:32,128 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:21:32,866 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 380 proven. 722 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:21:32,866 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:21:33,245 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 380 proven. 722 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:21:33,245 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2127070436] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:21:33,246 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [797867614] [2021-11-03 04:21:33,247 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-03 04:21:33,247 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:21:33,247 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:21:33,247 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:21:33,247 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:21:33,251 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:33,251 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:21:33,252 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:33,253 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 04:21:33,253 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:21:33,253 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:33,254 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 04:21:33,255 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-03 04:21:33,266 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_28|], 10=[|v_#valid_29|]} [2021-11-03 04:21:33,272 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:21:33,273 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-03 04:21:33,274 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:33,274 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:21:33,275 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:33,275 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:21:33,275 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 04:21:33,276 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:33,278 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:33,281 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:21:33,282 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:21:33,283 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:21:33,287 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:21:33,290 INFO L388 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 23 treesize of output 22 [2021-11-03 04:21:33,290 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:33,292 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:21:33,292 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:33,293 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:21:33,293 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 04:21:33,293 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:33,295 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:33,327 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:33,328 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:21:33,329 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 04:21:33,329 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-03 04:21:33,335 INFO L180 QuantifierPusher]: treesize reduction 13, result has 87.3 percent of original size [2021-11-03 04:21:33,337 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:21:33,340 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:33,342 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:21:33,343 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:33,344 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:21:33,345 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 88 [2021-11-03 04:21:33,349 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.4 percent of original size [2021-11-03 04:21:33,351 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 91 [2021-11-03 04:21:33,354 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:33,359 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:33,360 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:33,360 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:33,361 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:33,362 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:33,365 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:33,371 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:33,376 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 97 [2021-11-03 04:21:33,379 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:33,387 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:33,388 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:33,389 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:33,390 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:33,391 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:33,393 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:33,397 INFO L180 QuantifierPusher]: treesize reduction 24, result has 72.4 percent of original size [2021-11-03 04:21:33,400 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 42 [2021-11-03 04:21:33,405 INFO L180 QuantifierPusher]: treesize reduction 24, result has 68.0 percent of original size [2021-11-03 04:21:33,408 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:21:33,408 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:33,410 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 04:21:33,410 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 34 [2021-11-03 04:21:33,412 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:33,415 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 73 [2021-11-03 04:21:33,417 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:33,422 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:33,426 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:33,436 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:33,439 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 121 [2021-11-03 04:21:33,442 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:33,446 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 141 [2021-11-03 04:21:33,449 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:33,460 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:33,461 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:33,461 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:33,462 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:33,462 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:33,463 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:33,467 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:33,472 INFO L180 QuantifierPusher]: treesize reduction 24, result has 77.1 percent of original size [2021-11-03 04:21:33,474 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-03 04:21:33,476 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:33,480 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:33,481 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:33,481 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:33,482 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:33,483 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:33,486 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:21:33,488 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:21:33,493 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:21:33,495 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:21:33,497 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 04:21:34,330 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 04:21:34,330 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:21:34,330 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 22, 22] total 63 [2021-11-03 04:21:34,331 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [837471739] [2021-11-03 04:21:34,331 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 63 states [2021-11-03 04:21:34,332 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:21:34,332 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2021-11-03 04:21:34,333 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=747, Invalid=4365, Unknown=0, NotChecked=0, Total=5112 [2021-11-03 04:21:34,333 INFO L87 Difference]: Start difference. First operand 125 states and 127 transitions. Second operand has 63 states, 63 states have (on average 3.9206349206349205) internal successors, (247), 63 states have internal predecessors, (247), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:21:36,227 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:21:36,227 INFO L93 Difference]: Finished difference Result 277 states and 301 transitions. [2021-11-03 04:21:36,227 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2021-11-03 04:21:36,228 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 63 states have (on average 3.9206349206349205) internal successors, (247), 63 states have internal predecessors, (247), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 124 [2021-11-03 04:21:36,228 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:21:36,229 INFO L225 Difference]: With dead ends: 277 [2021-11-03 04:21:36,229 INFO L226 Difference]: Without dead ends: 194 [2021-11-03 04:21:36,232 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 512 GetRequests, 361 SyntacticMatches, 1 SemanticMatches, 150 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7650 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=3470, Invalid=19482, Unknown=0, NotChecked=0, Total=22952 [2021-11-03 04:21:36,232 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2021-11-03 04:21:36,242 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 131. [2021-11-03 04:21:36,243 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 131 states, 130 states have (on average 1.023076923076923) internal successors, (133), 130 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:21:36,244 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 133 transitions. [2021-11-03 04:21:36,244 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 133 transitions. Word has length 124 [2021-11-03 04:21:36,244 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:21:36,244 INFO L470 AbstractCegarLoop]: Abstraction has 131 states and 133 transitions. [2021-11-03 04:21:36,245 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 63 states, 63 states have (on average 3.9206349206349205) internal successors, (247), 63 states have internal predecessors, (247), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:21:36,245 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 133 transitions. [2021-11-03 04:21:36,246 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2021-11-03 04:21:36,246 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:21:36,246 INFO L513 BasicCegarLoop]: trace histogram [21, 21, 20, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:21:36,272 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-11-03 04:21:36,452 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable592,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:21:36,452 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:21:36,452 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:21:36,453 INFO L85 PathProgramCache]: Analyzing trace with hash -1214666672, now seen corresponding path program 22 times [2021-11-03 04:21:36,453 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:21:36,453 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1805439546] [2021-11-03 04:21:36,453 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:21:36,453 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:21:36,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:21:37,123 INFO L134 CoverageAnalysis]: Checked inductivity of 1220 backedges. 743 proven. 477 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:21:37,123 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:21:37,123 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1805439546] [2021-11-03 04:21:37,123 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1805439546] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:21:37,124 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1139498340] [2021-11-03 04:21:37,125 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-03 04:21:37,125 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:21:37,125 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:21:37,126 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:21:37,127 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-03 04:21:38,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:21:38,153 INFO L263 TraceCheckSpWp]: Trace formula consists of 491 conjuncts, 44 conjunts are in the unsatisfiable core [2021-11-03 04:21:38,155 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:21:39,307 INFO L134 CoverageAnalysis]: Checked inductivity of 1220 backedges. 800 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:21:39,307 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:21:39,684 INFO L134 CoverageAnalysis]: Checked inductivity of 1220 backedges. 800 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:21:39,684 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1139498340] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:21:39,685 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [570034450] [2021-11-03 04:21:39,686 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-03 04:21:39,686 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:21:39,686 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:21:39,687 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:21:39,687 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:21:39,690 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:39,691 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:21:39,691 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:39,692 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 04:21:39,692 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:21:39,693 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:39,693 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 04:21:39,694 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-03 04:21:39,696 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_29|], 10=[|v_#valid_30|]} [2021-11-03 04:21:39,702 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:21:39,703 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-03 04:21:39,703 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:39,704 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:21:39,704 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:39,704 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:21:39,705 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 04:21:39,705 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:39,707 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:39,710 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:21:39,711 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:21:39,712 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:21:39,715 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:21:39,716 INFO L388 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 23 treesize of output 22 [2021-11-03 04:21:39,717 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:39,718 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:21:39,719 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:39,719 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:21:39,719 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 04:21:39,720 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:39,722 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:39,723 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:39,723 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:21:39,724 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 04:21:39,724 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-03 04:21:39,729 INFO L180 QuantifierPusher]: treesize reduction 13, result has 87.3 percent of original size [2021-11-03 04:21:39,730 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:21:39,733 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:39,735 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:21:39,736 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:39,737 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:21:39,738 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 88 [2021-11-03 04:21:39,741 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.4 percent of original size [2021-11-03 04:21:39,744 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 95 [2021-11-03 04:21:39,746 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:39,752 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:39,753 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:39,754 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:39,754 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:39,755 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:39,757 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:39,760 INFO L180 QuantifierPusher]: treesize reduction 24, result has 72.4 percent of original size [2021-11-03 04:21:39,762 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 42 [2021-11-03 04:21:39,771 INFO L180 QuantifierPusher]: treesize reduction 24, result has 68.0 percent of original size [2021-11-03 04:21:39,773 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:21:39,773 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:39,775 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 04:21:39,775 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 34 [2021-11-03 04:21:39,778 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:39,780 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-03 04:21:39,782 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:39,785 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:39,793 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:39,800 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:39,802 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 121 [2021-11-03 04:21:39,805 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:39,808 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 141 [2021-11-03 04:21:39,810 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:39,821 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:39,822 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:39,822 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:39,823 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:39,824 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:39,825 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:39,827 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:39,831 INFO L180 QuantifierPusher]: treesize reduction 24, result has 77.1 percent of original size [2021-11-03 04:21:39,833 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-03 04:21:39,835 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:39,840 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:39,841 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:39,841 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:39,842 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:39,844 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:39,848 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:21:39,850 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:21:39,856 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:21:39,858 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:21:39,859 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 04:21:40,701 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 04:21:40,701 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:21:40,701 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 67 [2021-11-03 04:21:40,701 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1476744016] [2021-11-03 04:21:40,702 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 67 states [2021-11-03 04:21:40,702 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:21:40,702 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2021-11-03 04:21:40,702 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1085, Invalid=4615, Unknown=0, NotChecked=0, Total=5700 [2021-11-03 04:21:40,703 INFO L87 Difference]: Start difference. First operand 131 states and 133 transitions. Second operand has 67 states, 67 states have (on average 3.253731343283582) internal successors, (218), 67 states have internal predecessors, (218), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:21:41,343 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:21:41,343 INFO L93 Difference]: Finished difference Result 283 states and 307 transitions. [2021-11-03 04:21:41,344 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-11-03 04:21:41,344 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 67 states have (on average 3.253731343283582) internal successors, (218), 67 states have internal predecessors, (218), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 130 [2021-11-03 04:21:41,344 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:21:41,346 INFO L225 Difference]: With dead ends: 283 [2021-11-03 04:21:41,346 INFO L226 Difference]: Without dead ends: 196 [2021-11-03 04:21:41,347 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 453 GetRequests, 358 SyntacticMatches, 0 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2442 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=2011, Invalid=7301, Unknown=0, NotChecked=0, Total=9312 [2021-11-03 04:21:41,348 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2021-11-03 04:21:41,358 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 133. [2021-11-03 04:21:41,359 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 132 states have (on average 1.0227272727272727) internal successors, (135), 132 states have internal predecessors, (135), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:21:41,360 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 135 transitions. [2021-11-03 04:21:41,360 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 135 transitions. Word has length 130 [2021-11-03 04:21:41,360 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:21:41,360 INFO L470 AbstractCegarLoop]: Abstraction has 133 states and 135 transitions. [2021-11-03 04:21:41,361 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 67 states, 67 states have (on average 3.253731343283582) internal successors, (218), 67 states have internal predecessors, (218), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:21:41,361 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 135 transitions. [2021-11-03 04:21:41,361 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2021-11-03 04:21:41,362 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:21:41,362 INFO L513 BasicCegarLoop]: trace histogram [22, 21, 21, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:21:41,389 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-03 04:21:41,571 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable626,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:21:41,572 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:21:41,572 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:21:41,572 INFO L85 PathProgramCache]: Analyzing trace with hash -1764652939, now seen corresponding path program 23 times [2021-11-03 04:21:41,572 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:21:41,572 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [513516381] [2021-11-03 04:21:41,572 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:21:41,572 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:21:41,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:21:41,979 INFO L134 CoverageAnalysis]: Checked inductivity of 1262 backedges. 420 proven. 842 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:21:41,979 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:21:41,979 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [513516381] [2021-11-03 04:21:41,979 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [513516381] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:21:41,980 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [25305384] [2021-11-03 04:21:41,980 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-03 04:21:41,980 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:21:41,980 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:21:41,984 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:21:42,005 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-03 04:21:43,396 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2021-11-03 04:21:43,397 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 04:21:43,400 INFO L263 TraceCheckSpWp]: Trace formula consists of 501 conjuncts, 45 conjunts are in the unsatisfiable core [2021-11-03 04:21:43,403 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:21:43,740 INFO L134 CoverageAnalysis]: Checked inductivity of 1262 backedges. 462 proven. 800 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:21:43,740 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:21:44,115 INFO L134 CoverageAnalysis]: Checked inductivity of 1262 backedges. 462 proven. 800 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:21:44,115 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [25305384] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:21:44,115 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [820585347] [2021-11-03 04:21:44,116 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-03 04:21:44,117 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:21:44,117 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:21:44,117 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:21:44,117 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:21:44,127 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:44,127 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:21:44,128 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:44,128 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 04:21:44,128 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:21:44,129 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:44,129 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 04:21:44,130 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-03 04:21:44,132 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_30|], 10=[|v_#valid_31|]} [2021-11-03 04:21:44,136 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:21:44,137 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-03 04:21:44,137 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:44,138 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:21:44,138 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:44,138 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:21:44,139 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 04:21:44,139 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:44,140 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:44,143 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:21:44,143 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:21:44,144 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:21:44,147 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:21:44,150 INFO L388 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 23 treesize of output 22 [2021-11-03 04:21:44,153 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:44,154 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:21:44,155 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:44,155 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:21:44,155 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 04:21:44,156 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:44,157 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:44,158 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:44,158 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:21:44,159 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 04:21:44,159 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-03 04:21:44,162 INFO L180 QuantifierPusher]: treesize reduction 13, result has 87.3 percent of original size [2021-11-03 04:21:44,164 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:21:44,166 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:44,168 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:21:44,168 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:44,169 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:21:44,170 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 88 [2021-11-03 04:21:44,172 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.4 percent of original size [2021-11-03 04:21:44,175 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 97 [2021-11-03 04:21:44,176 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:44,181 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:44,182 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:44,182 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:44,183 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:44,183 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:44,185 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:44,188 INFO L180 QuantifierPusher]: treesize reduction 24, result has 72.4 percent of original size [2021-11-03 04:21:44,190 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 42 [2021-11-03 04:21:44,193 INFO L180 QuantifierPusher]: treesize reduction 24, result has 68.0 percent of original size [2021-11-03 04:21:44,194 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:21:44,195 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:44,196 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 04:21:44,196 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 34 [2021-11-03 04:21:44,198 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:44,200 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 73 [2021-11-03 04:21:44,202 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:44,205 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:44,208 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:44,213 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:44,215 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 132 [2021-11-03 04:21:44,217 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:44,220 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 152 [2021-11-03 04:21:44,225 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:44,238 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:44,239 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:44,239 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:44,240 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:44,240 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:44,241 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:44,243 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:44,246 INFO L180 QuantifierPusher]: treesize reduction 24, result has 77.1 percent of original size [2021-11-03 04:21:44,248 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-03 04:21:44,250 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:44,253 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:44,254 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:44,255 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:44,255 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:44,257 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:44,260 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:21:44,262 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:21:44,269 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:21:44,270 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:21:44,272 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 04:21:44,892 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 04:21:44,892 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:21:44,893 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 27 [2021-11-03 04:21:44,893 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [385986875] [2021-11-03 04:21:44,893 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-03 04:21:44,893 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:21:44,894 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-03 04:21:44,894 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=355, Invalid=977, Unknown=0, NotChecked=0, Total=1332 [2021-11-03 04:21:44,894 INFO L87 Difference]: Start difference. First operand 133 states and 135 transitions. Second operand has 28 states, 28 states have (on average 5.464285714285714) internal successors, (153), 27 states have internal predecessors, (153), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:21:45,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:21:45,280 INFO L93 Difference]: Finished difference Result 150 states and 153 transitions. [2021-11-03 04:21:45,281 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-11-03 04:21:45,281 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 5.464285714285714) internal successors, (153), 27 states have internal predecessors, (153), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 132 [2021-11-03 04:21:45,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:21:45,282 INFO L225 Difference]: With dead ends: 150 [2021-11-03 04:21:45,282 INFO L226 Difference]: Without dead ends: 148 [2021-11-03 04:21:45,283 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 462 GetRequests, 402 SyntacticMatches, 1 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1051 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1008, Invalid=2652, Unknown=0, NotChecked=0, Total=3660 [2021-11-03 04:21:45,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2021-11-03 04:21:45,294 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 141. [2021-11-03 04:21:45,295 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 140 states have (on average 1.0214285714285714) internal successors, (143), 140 states have internal predecessors, (143), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:21:45,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 143 transitions. [2021-11-03 04:21:45,296 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 143 transitions. Word has length 132 [2021-11-03 04:21:45,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:21:45,296 INFO L470 AbstractCegarLoop]: Abstraction has 141 states and 143 transitions. [2021-11-03 04:21:45,297 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 5.464285714285714) internal successors, (153), 27 states have internal predecessors, (153), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:21:45,297 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 143 transitions. [2021-11-03 04:21:45,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2021-11-03 04:21:45,298 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:21:45,298 INFO L513 BasicCegarLoop]: trace histogram [23, 22, 22, 22, 22, 21, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:21:45,328 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2021-11-03 04:21:45,515 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable653 [2021-11-03 04:21:45,516 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:21:45,516 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:21:45,516 INFO L85 PathProgramCache]: Analyzing trace with hash -35875493, now seen corresponding path program 24 times [2021-11-03 04:21:45,516 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:21:45,516 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2054661697] [2021-11-03 04:21:45,516 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:21:45,516 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:21:45,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:21:46,358 INFO L134 CoverageAnalysis]: Checked inductivity of 1430 backedges. 905 proven. 525 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:21:46,358 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:21:46,359 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2054661697] [2021-11-03 04:21:46,359 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2054661697] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:21:46,359 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [418456892] [2021-11-03 04:21:46,359 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-03 04:21:46,359 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:21:46,359 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:21:46,360 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:21:46,361 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-03 04:21:47,580 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-03 04:21:47,580 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 04:21:47,584 INFO L263 TraceCheckSpWp]: Trace formula consists of 525 conjuncts, 47 conjunts are in the unsatisfiable core [2021-11-03 04:21:47,587 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:21:48,886 INFO L134 CoverageAnalysis]: Checked inductivity of 1430 backedges. 968 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:21:48,887 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:21:49,277 INFO L134 CoverageAnalysis]: Checked inductivity of 1430 backedges. 968 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:21:49,278 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [418456892] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:21:49,278 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1129105636] [2021-11-03 04:21:49,279 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-03 04:21:49,279 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:21:49,280 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:21:49,280 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:21:49,280 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:21:49,289 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:49,290 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:21:49,291 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:49,291 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 04:21:49,291 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:21:49,292 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:49,292 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 04:21:49,293 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-03 04:21:49,295 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_31|], 10=[|v_#valid_32|]} [2021-11-03 04:21:49,300 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:21:49,301 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-03 04:21:49,301 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:49,302 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:21:49,302 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:49,302 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:21:49,302 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 04:21:49,303 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:49,304 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:49,306 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:21:49,307 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:21:49,307 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:21:49,310 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:21:49,311 INFO L388 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 23 treesize of output 22 [2021-11-03 04:21:49,311 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:49,312 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:21:49,313 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:49,313 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:21:49,313 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 04:21:49,314 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:49,315 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:49,315 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:49,316 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:21:49,316 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 04:21:49,316 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-03 04:21:49,321 INFO L180 QuantifierPusher]: treesize reduction 13, result has 87.3 percent of original size [2021-11-03 04:21:49,323 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:21:49,325 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:49,326 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:21:49,326 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:49,327 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:21:49,328 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 88 [2021-11-03 04:21:49,330 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.4 percent of original size [2021-11-03 04:21:49,333 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 97 [2021-11-03 04:21:49,337 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:49,342 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:49,343 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:49,344 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:49,344 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:49,345 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:49,346 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:49,348 INFO L180 QuantifierPusher]: treesize reduction 24, result has 72.4 percent of original size [2021-11-03 04:21:49,350 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 42 [2021-11-03 04:21:49,353 INFO L180 QuantifierPusher]: treesize reduction 24, result has 68.0 percent of original size [2021-11-03 04:21:49,360 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:21:49,360 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:49,362 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 04:21:49,363 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 34 [2021-11-03 04:21:49,365 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:49,367 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 73 [2021-11-03 04:21:49,369 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:49,372 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:49,375 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:49,379 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:49,381 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 132 [2021-11-03 04:21:49,382 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:49,384 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 152 [2021-11-03 04:21:49,387 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:49,398 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:49,399 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:49,399 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:49,400 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:49,401 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:49,401 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:49,404 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:49,408 INFO L180 QuantifierPusher]: treesize reduction 24, result has 77.1 percent of original size [2021-11-03 04:21:49,410 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-03 04:21:49,412 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:49,417 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:49,418 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:49,418 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:49,419 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:49,420 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:49,424 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:21:49,426 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:21:49,432 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:21:49,434 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:21:49,436 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 04:21:50,392 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 04:21:50,392 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:21:50,393 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 74 [2021-11-03 04:21:50,393 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [21873131] [2021-11-03 04:21:50,393 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 74 states [2021-11-03 04:21:50,394 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:21:50,394 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2021-11-03 04:21:50,395 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=5480, Unknown=0, NotChecked=0, Total=6806 [2021-11-03 04:21:50,395 INFO L87 Difference]: Start difference. First operand 141 states and 143 transitions. Second operand has 74 states, 74 states have (on average 3.310810810810811) internal successors, (245), 74 states have internal predecessors, (245), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:21:51,667 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:21:51,668 INFO L93 Difference]: Finished difference Result 396 states and 423 transitions. [2021-11-03 04:21:51,668 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2021-11-03 04:21:51,668 INFO L78 Accepts]: Start accepts. Automaton has has 74 states, 74 states have (on average 3.310810810810811) internal successors, (245), 74 states have internal predecessors, (245), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 140 [2021-11-03 04:21:51,668 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:21:51,669 INFO L225 Difference]: With dead ends: 396 [2021-11-03 04:21:51,669 INFO L226 Difference]: Without dead ends: 214 [2021-11-03 04:21:51,671 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 510 GetRequests, 384 SyntacticMatches, 0 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4366 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=3510, Invalid=12746, Unknown=0, NotChecked=0, Total=16256 [2021-11-03 04:21:51,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 214 states. [2021-11-03 04:21:51,680 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 214 to 145. [2021-11-03 04:21:51,681 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 145 states, 144 states have (on average 1.0208333333333333) internal successors, (147), 144 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:21:51,681 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 145 states to 145 states and 147 transitions. [2021-11-03 04:21:51,681 INFO L78 Accepts]: Start accepts. Automaton has 145 states and 147 transitions. Word has length 140 [2021-11-03 04:21:51,681 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:21:51,682 INFO L470 AbstractCegarLoop]: Abstraction has 145 states and 147 transitions. [2021-11-03 04:21:51,682 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 74 states, 74 states have (on average 3.310810810810811) internal successors, (245), 74 states have internal predecessors, (245), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:21:51,682 INFO L276 IsEmpty]: Start isEmpty. Operand 145 states and 147 transitions. [2021-11-03 04:21:51,682 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2021-11-03 04:21:51,683 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:21:51,683 INFO L513 BasicCegarLoop]: trace histogram [24, 23, 23, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:21:51,707 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2021-11-03 04:21:51,887 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable680 [2021-11-03 04:21:51,888 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:21:51,888 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:21:51,888 INFO L85 PathProgramCache]: Analyzing trace with hash 153230309, now seen corresponding path program 25 times [2021-11-03 04:21:51,888 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:21:51,888 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [389569853] [2021-11-03 04:21:51,888 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:21:51,889 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:21:51,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:21:52,290 INFO L134 CoverageAnalysis]: Checked inductivity of 1520 backedges. 506 proven. 1014 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:21:52,290 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:21:52,290 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [389569853] [2021-11-03 04:21:52,290 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [389569853] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:21:52,290 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [43756021] [2021-11-03 04:21:52,290 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-03 04:21:52,291 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:21:52,291 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:21:52,291 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:21:52,296 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-11-03 04:21:53,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:21:53,611 INFO L263 TraceCheckSpWp]: Trace formula consists of 545 conjuncts, 49 conjunts are in the unsatisfiable core [2021-11-03 04:21:53,613 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:21:54,017 INFO L134 CoverageAnalysis]: Checked inductivity of 1520 backedges. 552 proven. 968 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:21:54,017 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:21:54,422 INFO L134 CoverageAnalysis]: Checked inductivity of 1520 backedges. 552 proven. 968 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:21:54,422 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [43756021] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:21:54,422 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [824223802] [2021-11-03 04:21:54,424 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-03 04:21:54,424 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:21:54,424 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:21:54,424 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:21:54,425 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:21:54,437 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:54,437 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:21:54,438 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:54,438 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 04:21:54,438 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:21:54,439 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:54,439 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 04:21:54,441 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-03 04:21:54,443 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_32|], 10=[|v_#valid_33|]} [2021-11-03 04:21:54,448 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:21:54,449 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-03 04:21:54,450 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:54,450 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:21:54,451 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:54,451 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:21:54,451 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 04:21:54,452 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:54,454 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:54,457 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:21:54,458 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:21:54,459 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:21:54,462 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:21:54,463 INFO L388 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 23 treesize of output 22 [2021-11-03 04:21:54,464 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:54,465 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:21:54,466 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:54,466 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:21:54,466 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 04:21:54,467 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:54,469 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:54,470 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:54,471 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:21:54,472 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 04:21:54,472 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-03 04:21:54,477 INFO L180 QuantifierPusher]: treesize reduction 13, result has 87.3 percent of original size [2021-11-03 04:21:54,479 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:21:54,482 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:54,484 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:21:54,485 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:54,487 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:21:54,488 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 88 [2021-11-03 04:21:54,492 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.4 percent of original size [2021-11-03 04:21:54,496 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 91 [2021-11-03 04:21:54,497 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:54,503 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:54,504 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:54,505 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:54,505 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:54,506 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:54,508 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:54,513 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:54,516 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 101 [2021-11-03 04:21:54,518 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:54,524 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:54,525 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:54,526 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:54,526 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:54,527 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:54,529 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:54,532 INFO L180 QuantifierPusher]: treesize reduction 24, result has 72.4 percent of original size [2021-11-03 04:21:54,535 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 42 [2021-11-03 04:21:54,538 INFO L180 QuantifierPusher]: treesize reduction 24, result has 68.0 percent of original size [2021-11-03 04:21:54,539 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:21:54,539 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:54,541 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 04:21:54,541 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 34 [2021-11-03 04:21:54,545 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:54,546 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 75 [2021-11-03 04:21:54,548 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:54,551 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:54,554 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:54,560 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:54,572 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 132 [2021-11-03 04:21:54,574 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:21:54,576 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 152 [2021-11-03 04:21:54,579 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:54,587 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:54,588 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:54,588 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:54,589 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:54,589 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:54,590 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:54,592 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:54,595 INFO L180 QuantifierPusher]: treesize reduction 24, result has 77.1 percent of original size [2021-11-03 04:21:54,597 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-03 04:21:54,598 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:54,602 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:54,603 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:54,603 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:54,604 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:54,605 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:21:54,614 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:21:54,616 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:21:54,623 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:21:54,625 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:21:54,627 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 04:21:55,376 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 04:21:55,377 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:21:55,377 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 29 [2021-11-03 04:21:55,377 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [999601137] [2021-11-03 04:21:55,377 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2021-11-03 04:21:55,377 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:21:55,378 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-11-03 04:21:55,378 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=406, Invalid=1076, Unknown=0, NotChecked=0, Total=1482 [2021-11-03 04:21:55,378 INFO L87 Difference]: Start difference. First operand 145 states and 147 transitions. Second operand has 30 states, 30 states have (on average 5.5) internal successors, (165), 29 states have internal predecessors, (165), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:21:55,805 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:21:55,805 INFO L93 Difference]: Finished difference Result 162 states and 165 transitions. [2021-11-03 04:21:55,806 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-11-03 04:21:55,806 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 5.5) internal successors, (165), 29 states have internal predecessors, (165), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 144 [2021-11-03 04:21:55,806 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:21:55,807 INFO L225 Difference]: With dead ends: 162 [2021-11-03 04:21:55,807 INFO L226 Difference]: Without dead ends: 160 [2021-11-03 04:21:55,807 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 504 GetRequests, 440 SyntacticMatches, 1 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1191 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1165, Invalid=2995, Unknown=0, NotChecked=0, Total=4160 [2021-11-03 04:21:55,807 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2021-11-03 04:21:55,818 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 153. [2021-11-03 04:21:55,819 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 153 states, 152 states have (on average 1.019736842105263) internal successors, (155), 152 states have internal predecessors, (155), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:21:55,820 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 155 transitions. [2021-11-03 04:21:55,820 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 155 transitions. Word has length 144 [2021-11-03 04:21:55,820 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:21:55,820 INFO L470 AbstractCegarLoop]: Abstraction has 153 states and 155 transitions. [2021-11-03 04:21:55,821 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 5.5) internal successors, (165), 29 states have internal predecessors, (165), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:21:55,821 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 155 transitions. [2021-11-03 04:21:55,822 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2021-11-03 04:21:55,822 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:21:55,822 INFO L513 BasicCegarLoop]: trace histogram [25, 24, 24, 24, 24, 23, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:21:55,853 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2021-11-03 04:21:56,039 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable707,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:21:56,040 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:21:56,040 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:21:56,040 INFO L85 PathProgramCache]: Analyzing trace with hash 1239070923, now seen corresponding path program 26 times [2021-11-03 04:21:56,040 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:21:56,040 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [602866666] [2021-11-03 04:21:56,040 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:21:56,040 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:21:56,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:21:56,940 INFO L134 CoverageAnalysis]: Checked inductivity of 1704 backedges. 1083 proven. 621 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:21:56,940 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:21:56,940 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [602866666] [2021-11-03 04:21:56,940 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [602866666] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:21:56,940 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1377950777] [2021-11-03 04:21:56,941 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-03 04:21:56,941 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:21:56,941 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:21:56,941 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:21:56,942 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-11-03 04:21:58,377 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 25 check-sat command(s) [2021-11-03 04:21:58,377 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 04:21:58,380 INFO L263 TraceCheckSpWp]: Trace formula consists of 569 conjuncts, 51 conjunts are in the unsatisfiable core [2021-11-03 04:21:58,382 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:21:59,890 INFO L134 CoverageAnalysis]: Checked inductivity of 1704 backedges. 1152 proven. 552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:21:59,891 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:22:00,315 INFO L134 CoverageAnalysis]: Checked inductivity of 1704 backedges. 1152 proven. 552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:22:00,315 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1377950777] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:22:00,316 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [917605445] [2021-11-03 04:22:00,317 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-03 04:22:00,317 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:22:00,317 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:22:00,317 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:22:00,317 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:22:00,341 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:00,341 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:22:00,342 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:00,342 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 04:22:00,343 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:22:00,343 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:00,343 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 04:22:00,344 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-03 04:22:00,346 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_33|], 10=[|v_#valid_34|]} [2021-11-03 04:22:00,351 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:22:00,352 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-03 04:22:00,353 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:00,353 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:22:00,353 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:00,354 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:22:00,354 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 04:22:00,354 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:00,356 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:00,361 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:22:00,362 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:22:00,363 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:22:00,367 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:22:00,368 INFO L388 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 23 treesize of output 22 [2021-11-03 04:22:00,368 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:00,369 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:22:00,370 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:00,370 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:22:00,370 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 04:22:00,370 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:00,372 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:00,372 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:00,373 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:22:00,373 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 04:22:00,373 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-03 04:22:00,376 INFO L180 QuantifierPusher]: treesize reduction 13, result has 87.3 percent of original size [2021-11-03 04:22:00,377 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:22:00,379 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:00,381 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:22:00,381 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:00,382 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:22:00,383 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 88 [2021-11-03 04:22:00,384 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.4 percent of original size [2021-11-03 04:22:00,387 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 95 [2021-11-03 04:22:00,388 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:00,394 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:00,395 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:00,396 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:00,396 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:00,396 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:00,398 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:00,400 INFO L180 QuantifierPusher]: treesize reduction 24, result has 72.4 percent of original size [2021-11-03 04:22:00,402 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 42 [2021-11-03 04:22:00,405 INFO L180 QuantifierPusher]: treesize reduction 24, result has 68.0 percent of original size [2021-11-03 04:22:00,406 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:22:00,406 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:00,407 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 04:22:00,407 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 34 [2021-11-03 04:22:00,409 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:00,411 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 75 [2021-11-03 04:22:00,412 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:00,414 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:00,417 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:00,422 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:00,423 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 132 [2021-11-03 04:22:00,425 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:00,427 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 152 [2021-11-03 04:22:00,429 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:00,435 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:00,436 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:00,437 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:00,438 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:00,438 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:00,439 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:00,441 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:00,445 INFO L180 QuantifierPusher]: treesize reduction 24, result has 77.1 percent of original size [2021-11-03 04:22:00,447 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-03 04:22:00,449 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:00,452 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:00,453 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:00,453 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:00,453 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:00,454 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:00,457 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:22:00,458 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:22:00,463 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:22:00,464 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:22:00,465 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 04:22:01,360 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 04:22:01,360 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:22:01,360 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 80 [2021-11-03 04:22:01,360 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1250961486] [2021-11-03 04:22:01,361 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 80 states [2021-11-03 04:22:01,361 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:22:01,361 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2021-11-03 04:22:01,362 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1538, Invalid=6294, Unknown=0, NotChecked=0, Total=7832 [2021-11-03 04:22:01,362 INFO L87 Difference]: Start difference. First operand 153 states and 155 transitions. Second operand has 80 states, 80 states have (on average 3.3125) internal successors, (265), 80 states have internal predecessors, (265), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:22:02,825 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:22:02,825 INFO L93 Difference]: Finished difference Result 430 states and 459 transitions. [2021-11-03 04:22:02,825 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2021-11-03 04:22:02,826 INFO L78 Accepts]: Start accepts. Automaton has has 80 states, 80 states have (on average 3.3125) internal successors, (265), 80 states have internal predecessors, (265), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 152 [2021-11-03 04:22:02,826 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:22:02,827 INFO L225 Difference]: With dead ends: 430 [2021-11-03 04:22:02,827 INFO L226 Difference]: Without dead ends: 232 [2021-11-03 04:22:02,829 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 554 GetRequests, 418 SyntacticMatches, 0 SemanticMatches, 136 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5046 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=4112, Invalid=14794, Unknown=0, NotChecked=0, Total=18906 [2021-11-03 04:22:02,830 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 232 states. [2021-11-03 04:22:02,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 232 to 157. [2021-11-03 04:22:02,843 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 157 states, 156 states have (on average 1.0192307692307692) internal successors, (159), 156 states have internal predecessors, (159), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:22:02,843 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 159 transitions. [2021-11-03 04:22:02,844 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 159 transitions. Word has length 152 [2021-11-03 04:22:02,844 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:22:02,844 INFO L470 AbstractCegarLoop]: Abstraction has 157 states and 159 transitions. [2021-11-03 04:22:02,844 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 80 states, 80 states have (on average 3.3125) internal successors, (265), 80 states have internal predecessors, (265), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:22:02,845 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 159 transitions. [2021-11-03 04:22:02,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2021-11-03 04:22:02,845 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:22:02,846 INFO L513 BasicCegarLoop]: trace histogram [26, 25, 25, 24, 24, 24, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:22:02,881 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2021-11-03 04:22:03,059 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable741 [2021-11-03 04:22:03,060 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:22:03,060 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:22:03,060 INFO L85 PathProgramCache]: Analyzing trace with hash -1113014187, now seen corresponding path program 27 times [2021-11-03 04:22:03,060 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:22:03,060 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [37294225] [2021-11-03 04:22:03,060 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:22:03,060 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:22:03,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:22:03,469 INFO L134 CoverageAnalysis]: Checked inductivity of 1802 backedges. 600 proven. 1202 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:22:03,469 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:22:03,469 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [37294225] [2021-11-03 04:22:03,469 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [37294225] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:22:03,469 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1688762823] [2021-11-03 04:22:03,469 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-03 04:22:03,469 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:22:03,469 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:22:03,470 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:22:03,472 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2021-11-03 04:22:05,025 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-03 04:22:05,025 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 04:22:05,028 INFO L263 TraceCheckSpWp]: Trace formula consists of 589 conjuncts, 53 conjunts are in the unsatisfiable core [2021-11-03 04:22:05,031 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:22:05,419 INFO L134 CoverageAnalysis]: Checked inductivity of 1802 backedges. 650 proven. 1152 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:22:05,419 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:22:05,862 INFO L134 CoverageAnalysis]: Checked inductivity of 1802 backedges. 650 proven. 1152 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:22:05,862 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1688762823] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:22:05,863 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1189510244] [2021-11-03 04:22:05,865 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-03 04:22:05,865 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:22:05,865 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:22:05,865 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:22:05,865 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:22:05,868 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:05,869 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:22:05,869 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:05,870 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 04:22:05,870 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:22:05,870 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:05,871 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 04:22:05,872 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-03 04:22:05,873 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_34|], 10=[|v_#valid_35|]} [2021-11-03 04:22:05,879 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:22:05,880 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-03 04:22:05,880 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:05,881 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:22:05,881 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:05,881 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:22:05,882 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 04:22:05,882 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:05,884 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:05,887 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:22:05,888 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:22:05,889 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:22:05,892 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:22:05,893 INFO L388 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 23 treesize of output 22 [2021-11-03 04:22:05,894 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:05,895 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:22:05,896 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:05,896 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:22:05,896 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 04:22:05,897 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:05,898 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:05,899 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:05,900 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:22:05,901 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 04:22:05,901 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-03 04:22:05,905 INFO L180 QuantifierPusher]: treesize reduction 13, result has 87.3 percent of original size [2021-11-03 04:22:05,907 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:22:05,909 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:05,911 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:22:05,912 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:05,913 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:22:05,914 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 88 [2021-11-03 04:22:05,917 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.4 percent of original size [2021-11-03 04:22:05,920 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 95 [2021-11-03 04:22:05,922 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:05,928 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:05,929 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:05,930 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:05,930 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:05,931 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:05,934 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:05,938 INFO L180 QuantifierPusher]: treesize reduction 24, result has 72.4 percent of original size [2021-11-03 04:22:05,940 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 42 [2021-11-03 04:22:05,944 INFO L180 QuantifierPusher]: treesize reduction 24, result has 68.0 percent of original size [2021-11-03 04:22:05,945 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:22:05,946 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:05,947 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 04:22:05,948 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 34 [2021-11-03 04:22:05,951 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:05,953 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 73 [2021-11-03 04:22:05,954 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:05,958 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:05,962 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:05,969 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:05,971 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 132 [2021-11-03 04:22:05,974 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:05,977 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 152 [2021-11-03 04:22:05,980 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:05,990 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:05,991 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:05,992 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:05,992 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:05,993 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:05,994 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:05,996 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:06,000 INFO L180 QuantifierPusher]: treesize reduction 24, result has 77.1 percent of original size [2021-11-03 04:22:06,002 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-03 04:22:06,004 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:06,008 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:06,009 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:06,010 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:06,011 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:06,012 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:06,016 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:22:06,018 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:22:06,024 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:22:06,026 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:22:06,028 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 04:22:06,750 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 04:22:06,750 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:22:06,750 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 31 [2021-11-03 04:22:06,750 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [149485863] [2021-11-03 04:22:06,751 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-03 04:22:06,751 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:22:06,751 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-03 04:22:06,751 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=461, Invalid=1179, Unknown=0, NotChecked=0, Total=1640 [2021-11-03 04:22:06,751 INFO L87 Difference]: Start difference. First operand 157 states and 159 transitions. Second operand has 32 states, 32 states have (on average 5.53125) internal successors, (177), 31 states have internal predecessors, (177), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:22:07,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:22:07,223 INFO L93 Difference]: Finished difference Result 174 states and 177 transitions. [2021-11-03 04:22:07,223 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2021-11-03 04:22:07,224 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 5.53125) internal successors, (177), 31 states have internal predecessors, (177), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 156 [2021-11-03 04:22:07,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:22:07,225 INFO L225 Difference]: With dead ends: 174 [2021-11-03 04:22:07,225 INFO L226 Difference]: Without dead ends: 172 [2021-11-03 04:22:07,226 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 546 GetRequests, 478 SyntacticMatches, 1 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1339 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1334, Invalid=3358, Unknown=0, NotChecked=0, Total=4692 [2021-11-03 04:22:07,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2021-11-03 04:22:07,240 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 165. [2021-11-03 04:22:07,241 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 165 states, 164 states have (on average 1.0182926829268293) internal successors, (167), 164 states have internal predecessors, (167), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:22:07,242 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 165 states to 165 states and 167 transitions. [2021-11-03 04:22:07,242 INFO L78 Accepts]: Start accepts. Automaton has 165 states and 167 transitions. Word has length 156 [2021-11-03 04:22:07,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:22:07,242 INFO L470 AbstractCegarLoop]: Abstraction has 165 states and 167 transitions. [2021-11-03 04:22:07,243 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 5.53125) internal successors, (177), 31 states have internal predecessors, (177), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:22:07,243 INFO L276 IsEmpty]: Start isEmpty. Operand 165 states and 167 transitions. [2021-11-03 04:22:07,244 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2021-11-03 04:22:07,244 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:22:07,244 INFO L513 BasicCegarLoop]: trace histogram [27, 26, 26, 26, 26, 25, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:22:07,285 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2021-11-03 04:22:07,459 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable768,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:22:07,460 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:22:07,460 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:22:07,460 INFO L85 PathProgramCache]: Analyzing trace with hash -848433861, now seen corresponding path program 28 times [2021-11-03 04:22:07,460 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:22:07,460 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1823197815] [2021-11-03 04:22:07,460 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:22:07,460 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:22:07,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:22:08,526 INFO L134 CoverageAnalysis]: Checked inductivity of 2002 backedges. 1277 proven. 725 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:22:08,526 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:22:08,526 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1823197815] [2021-11-03 04:22:08,526 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1823197815] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:22:08,527 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1770403216] [2021-11-03 04:22:08,527 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-03 04:22:08,527 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:22:08,527 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:22:08,548 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:22:08,550 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2021-11-03 04:22:10,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:22:10,186 INFO L263 TraceCheckSpWp]: Trace formula consists of 613 conjuncts, 54 conjunts are in the unsatisfiable core [2021-11-03 04:22:10,189 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:22:11,805 INFO L134 CoverageAnalysis]: Checked inductivity of 2002 backedges. 1350 proven. 650 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-03 04:22:11,805 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:22:12,229 INFO L134 CoverageAnalysis]: Checked inductivity of 2002 backedges. 1350 proven. 650 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-03 04:22:12,229 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1770403216] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:22:12,229 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1888004811] [2021-11-03 04:22:12,230 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-03 04:22:12,230 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:22:12,231 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:22:12,231 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:22:12,231 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:22:12,237 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:12,237 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:22:12,238 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:12,238 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 04:22:12,238 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:22:12,238 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:12,239 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 04:22:12,239 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-03 04:22:12,242 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_35|], 10=[|v_#valid_36|]} [2021-11-03 04:22:12,246 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:22:12,246 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-03 04:22:12,247 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:12,247 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:22:12,247 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:12,247 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:22:12,248 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 04:22:12,248 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:12,249 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:12,251 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:22:12,252 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:22:12,253 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:22:12,262 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:22:12,262 INFO L388 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 23 treesize of output 22 [2021-11-03 04:22:12,263 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:12,264 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:22:12,264 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:12,265 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:22:12,265 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 04:22:12,265 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:12,266 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:12,267 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:12,267 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:22:12,268 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 04:22:12,268 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-03 04:22:12,271 INFO L180 QuantifierPusher]: treesize reduction 13, result has 87.3 percent of original size [2021-11-03 04:22:12,272 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:22:12,274 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:12,275 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:22:12,276 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:12,277 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:22:12,278 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 88 [2021-11-03 04:22:12,279 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.4 percent of original size [2021-11-03 04:22:12,281 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 95 [2021-11-03 04:22:12,283 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:12,291 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:12,291 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:12,292 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:12,292 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:12,293 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:12,294 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:12,296 INFO L180 QuantifierPusher]: treesize reduction 24, result has 72.4 percent of original size [2021-11-03 04:22:12,298 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 42 [2021-11-03 04:22:12,301 INFO L180 QuantifierPusher]: treesize reduction 24, result has 68.0 percent of original size [2021-11-03 04:22:12,302 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:22:12,302 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:12,304 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 04:22:12,304 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 34 [2021-11-03 04:22:12,309 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:12,311 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 75 [2021-11-03 04:22:12,312 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:12,315 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:12,317 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:12,321 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:12,323 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 132 [2021-11-03 04:22:12,324 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:12,326 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 152 [2021-11-03 04:22:12,329 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:12,335 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:12,336 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:12,336 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:12,336 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:12,337 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:12,337 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:12,339 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:12,342 INFO L180 QuantifierPusher]: treesize reduction 24, result has 77.1 percent of original size [2021-11-03 04:22:12,343 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-03 04:22:12,345 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:12,348 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:12,349 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:12,349 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:12,349 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:12,359 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:12,363 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:22:12,365 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:22:12,369 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:22:12,370 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:22:12,372 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 04:22:13,331 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 04:22:13,331 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:22:13,331 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 54, 54] total 83 [2021-11-03 04:22:13,331 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [719559932] [2021-11-03 04:22:13,332 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 83 states [2021-11-03 04:22:13,332 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:22:13,333 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2021-11-03 04:22:13,334 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1623, Invalid=6749, Unknown=0, NotChecked=0, Total=8372 [2021-11-03 04:22:13,334 INFO L87 Difference]: Start difference. First operand 165 states and 167 transitions. Second operand has 83 states, 83 states have (on average 3.325301204819277) internal successors, (276), 83 states have internal predecessors, (276), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:22:14,234 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:22:14,235 INFO L93 Difference]: Finished difference Result 354 states and 383 transitions. [2021-11-03 04:22:14,235 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-11-03 04:22:14,235 INFO L78 Accepts]: Start accepts. Automaton has has 83 states, 83 states have (on average 3.325301204819277) internal successors, (276), 83 states have internal predecessors, (276), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 164 [2021-11-03 04:22:14,235 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:22:14,237 INFO L225 Difference]: With dead ends: 354 [2021-11-03 04:22:14,237 INFO L226 Difference]: Without dead ends: 245 [2021-11-03 04:22:14,239 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 571 GetRequests, 455 SyntacticMatches, 0 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3564 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=3029, Invalid=10777, Unknown=0, NotChecked=0, Total=13806 [2021-11-03 04:22:14,239 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 245 states. [2021-11-03 04:22:14,254 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 245 to 167. [2021-11-03 04:22:14,255 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 167 states, 166 states have (on average 1.0180722891566265) internal successors, (169), 166 states have internal predecessors, (169), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:22:14,256 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 169 transitions. [2021-11-03 04:22:14,256 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 169 transitions. Word has length 164 [2021-11-03 04:22:14,256 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:22:14,256 INFO L470 AbstractCegarLoop]: Abstraction has 167 states and 169 transitions. [2021-11-03 04:22:14,257 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 83 states, 83 states have (on average 3.325301204819277) internal successors, (276), 83 states have internal predecessors, (276), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:22:14,257 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 169 transitions. [2021-11-03 04:22:14,258 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 167 [2021-11-03 04:22:14,258 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:22:14,258 INFO L513 BasicCegarLoop]: trace histogram [27, 27, 26, 26, 26, 26, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:22:14,301 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Ended with exit code 0 [2021-11-03 04:22:14,471 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable795 [2021-11-03 04:22:14,472 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:22:14,472 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:22:14,472 INFO L85 PathProgramCache]: Analyzing trace with hash -1543404512, now seen corresponding path program 29 times [2021-11-03 04:22:14,472 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:22:14,472 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [898693052] [2021-11-03 04:22:14,472 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:22:14,472 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:22:14,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:22:15,592 INFO L134 CoverageAnalysis]: Checked inductivity of 2054 backedges. 1277 proven. 777 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:22:15,593 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:22:15,593 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [898693052] [2021-11-03 04:22:15,593 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [898693052] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:22:15,593 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1242238478] [2021-11-03 04:22:15,593 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-03 04:22:15,593 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:22:15,593 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:22:15,596 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:22:15,622 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2021-11-03 04:22:17,569 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 27 check-sat command(s) [2021-11-03 04:22:17,569 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 04:22:17,572 INFO L263 TraceCheckSpWp]: Trace formula consists of 623 conjuncts, 56 conjunts are in the unsatisfiable core [2021-11-03 04:22:17,574 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:22:18,731 INFO L134 CoverageAnalysis]: Checked inductivity of 2054 backedges. 702 proven. 1352 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:22:18,732 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:22:19,154 INFO L134 CoverageAnalysis]: Checked inductivity of 2054 backedges. 702 proven. 1352 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:22:19,154 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1242238478] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:22:19,155 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2022253716] [2021-11-03 04:22:19,156 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-03 04:22:19,156 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:22:19,156 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:22:19,157 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:22:19,157 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:22:19,166 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:19,167 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:22:19,167 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:19,167 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 04:22:19,168 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:22:19,168 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:19,168 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 04:22:19,169 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-03 04:22:19,170 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_36|], 10=[|v_#valid_37|]} [2021-11-03 04:22:19,175 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:22:19,176 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-03 04:22:19,176 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:19,176 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:22:19,176 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:19,177 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:22:19,177 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 04:22:19,177 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:19,178 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:19,181 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:22:19,181 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:22:19,182 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:22:19,185 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:22:19,188 INFO L388 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 23 treesize of output 22 [2021-11-03 04:22:19,188 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:19,189 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:22:19,190 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:19,190 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:22:19,190 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 04:22:19,190 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:19,192 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:19,192 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:19,193 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:22:19,193 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 04:22:19,193 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-03 04:22:19,196 INFO L180 QuantifierPusher]: treesize reduction 13, result has 87.3 percent of original size [2021-11-03 04:22:19,197 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:22:19,214 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:19,216 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:22:19,217 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:19,218 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:22:19,219 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 88 [2021-11-03 04:22:19,222 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.4 percent of original size [2021-11-03 04:22:19,225 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 95 [2021-11-03 04:22:19,227 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:19,233 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:19,233 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:19,234 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:19,235 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:19,235 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:19,237 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:19,240 INFO L180 QuantifierPusher]: treesize reduction 24, result has 72.4 percent of original size [2021-11-03 04:22:19,243 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 42 [2021-11-03 04:22:19,247 INFO L180 QuantifierPusher]: treesize reduction 24, result has 68.0 percent of original size [2021-11-03 04:22:19,248 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:22:19,248 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:19,250 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 04:22:19,250 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 34 [2021-11-03 04:22:19,253 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:19,255 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 73 [2021-11-03 04:22:19,257 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:19,260 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:19,263 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:19,270 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:19,273 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 132 [2021-11-03 04:22:19,275 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:19,277 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 152 [2021-11-03 04:22:19,280 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:19,286 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:19,287 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:19,287 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:19,287 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:19,288 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:19,288 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:19,303 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:19,307 INFO L180 QuantifierPusher]: treesize reduction 24, result has 77.1 percent of original size [2021-11-03 04:22:19,309 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-03 04:22:19,311 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:19,316 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:19,317 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:19,319 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:19,320 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:19,323 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:19,327 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:22:19,329 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:22:19,333 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:22:19,335 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:22:19,336 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 04:22:20,273 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 04:22:20,273 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:22:20,273 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 29, 29] total 84 [2021-11-03 04:22:20,273 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [356805107] [2021-11-03 04:22:20,274 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 84 states [2021-11-03 04:22:20,274 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:22:20,275 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2021-11-03 04:22:20,276 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1279, Invalid=7277, Unknown=0, NotChecked=0, Total=8556 [2021-11-03 04:22:20,276 INFO L87 Difference]: Start difference. First operand 167 states and 169 transitions. Second operand has 84 states, 84 states have (on average 3.9404761904761907) internal successors, (331), 84 states have internal predecessors, (331), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:22:23,017 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:22:23,017 INFO L93 Difference]: Finished difference Result 368 states and 399 transitions. [2021-11-03 04:22:23,017 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 113 states. [2021-11-03 04:22:23,017 INFO L78 Accepts]: Start accepts. Automaton has has 84 states, 84 states have (on average 3.9404761904761907) internal successors, (331), 84 states have internal predecessors, (331), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 166 [2021-11-03 04:22:23,018 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:22:23,019 INFO L225 Difference]: With dead ends: 368 [2021-11-03 04:22:23,019 INFO L226 Difference]: Without dead ends: 257 [2021-11-03 04:22:23,024 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 687 GetRequests, 487 SyntacticMatches, 1 SemanticMatches, 199 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13642 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=6088, Invalid=34112, Unknown=0, NotChecked=0, Total=40200 [2021-11-03 04:22:23,024 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 257 states. [2021-11-03 04:22:23,037 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 257 to 173. [2021-11-03 04:22:23,038 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 173 states, 172 states have (on average 1.0174418604651163) internal successors, (175), 172 states have internal predecessors, (175), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:22:23,038 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 175 transitions. [2021-11-03 04:22:23,039 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 175 transitions. Word has length 166 [2021-11-03 04:22:23,039 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:22:23,039 INFO L470 AbstractCegarLoop]: Abstraction has 173 states and 175 transitions. [2021-11-03 04:22:23,039 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 84 states, 84 states have (on average 3.9404761904761907) internal successors, (331), 84 states have internal predecessors, (331), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:22:23,039 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 175 transitions. [2021-11-03 04:22:23,040 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 173 [2021-11-03 04:22:23,040 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:22:23,041 INFO L513 BasicCegarLoop]: trace histogram [28, 28, 27, 27, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:22:23,070 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2021-11-03 04:22:23,251 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable822 [2021-11-03 04:22:23,252 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:22:23,252 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:22:23,252 INFO L85 PathProgramCache]: Analyzing trace with hash -1621508872, now seen corresponding path program 30 times [2021-11-03 04:22:23,252 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:22:23,252 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [785267733] [2021-11-03 04:22:23,252 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:22:23,252 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:22:23,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:22:24,318 INFO L134 CoverageAnalysis]: Checked inductivity of 2214 backedges. 1380 proven. 834 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:22:24,318 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:22:24,318 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [785267733] [2021-11-03 04:22:24,318 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [785267733] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:22:24,318 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [777934753] [2021-11-03 04:22:24,318 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-03 04:22:24,319 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:22:24,319 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:22:24,319 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:22:24,320 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2021-11-03 04:22:26,221 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-03 04:22:26,221 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 04:22:26,224 INFO L263 TraceCheckSpWp]: Trace formula consists of 645 conjuncts, 58 conjunts are in the unsatisfiable core [2021-11-03 04:22:26,227 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:22:27,541 INFO L134 CoverageAnalysis]: Checked inductivity of 2214 backedges. 756 proven. 1458 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:22:27,541 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:22:28,007 INFO L134 CoverageAnalysis]: Checked inductivity of 2214 backedges. 756 proven. 1458 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:22:28,008 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [777934753] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:22:28,008 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1698674957] [2021-11-03 04:22:28,009 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-03 04:22:28,009 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:22:28,009 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:22:28,009 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:22:28,009 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:22:28,013 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:28,013 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:22:28,014 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:28,014 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 04:22:28,014 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:22:28,015 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:28,015 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 04:22:28,015 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-03 04:22:28,017 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_37|], 10=[|v_#valid_38|]} [2021-11-03 04:22:28,021 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:22:28,021 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-03 04:22:28,022 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:28,022 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:22:28,022 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:28,023 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:22:28,023 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 04:22:28,023 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:28,024 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:28,026 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:22:28,027 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:22:28,028 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:22:28,038 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:22:28,039 INFO L388 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 23 treesize of output 22 [2021-11-03 04:22:28,039 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:28,040 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:22:28,040 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:28,041 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:22:28,041 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 04:22:28,041 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:28,042 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:28,043 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:28,043 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:22:28,044 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 04:22:28,044 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-03 04:22:28,047 INFO L180 QuantifierPusher]: treesize reduction 13, result has 87.3 percent of original size [2021-11-03 04:22:28,048 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:22:28,050 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:28,051 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:22:28,052 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:28,053 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:22:28,053 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 88 [2021-11-03 04:22:28,055 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.4 percent of original size [2021-11-03 04:22:28,057 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 04:22:28,059 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:28,062 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:28,063 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:28,064 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:28,064 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:28,065 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:28,072 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:28,075 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:28,078 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 96 [2021-11-03 04:22:28,080 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:28,084 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:28,084 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:28,085 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:28,085 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:28,086 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:28,087 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:28,089 INFO L180 QuantifierPusher]: treesize reduction 24, result has 72.4 percent of original size [2021-11-03 04:22:28,091 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 42 [2021-11-03 04:22:28,094 INFO L180 QuantifierPusher]: treesize reduction 24, result has 68.0 percent of original size [2021-11-03 04:22:28,094 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:22:28,095 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:28,096 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 04:22:28,096 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 34 [2021-11-03 04:22:28,103 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:28,104 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 75 [2021-11-03 04:22:28,106 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:28,108 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:28,111 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:28,116 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:28,117 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 132 [2021-11-03 04:22:28,119 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:28,121 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 152 [2021-11-03 04:22:28,123 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:28,130 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:28,130 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:28,131 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:28,131 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:28,131 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:28,132 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:28,133 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:28,136 INFO L180 QuantifierPusher]: treesize reduction 24, result has 77.1 percent of original size [2021-11-03 04:22:28,137 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-03 04:22:28,139 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:28,142 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:28,142 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:28,143 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:28,143 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:28,145 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:28,147 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:22:28,148 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:22:28,153 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:22:28,154 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:22:28,155 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 04:22:29,071 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 04:22:29,072 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:22:29,072 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 30, 30] total 87 [2021-11-03 04:22:29,072 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [638811299] [2021-11-03 04:22:29,072 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 87 states [2021-11-03 04:22:29,073 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:22:29,073 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2021-11-03 04:22:29,074 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1367, Invalid=7753, Unknown=0, NotChecked=0, Total=9120 [2021-11-03 04:22:29,074 INFO L87 Difference]: Start difference. First operand 173 states and 175 transitions. Second operand has 87 states, 87 states have (on average 3.942528735632184) internal successors, (343), 87 states have internal predecessors, (343), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:22:31,977 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:22:31,977 INFO L93 Difference]: Finished difference Result 381 states and 413 transitions. [2021-11-03 04:22:31,977 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 117 states. [2021-11-03 04:22:31,977 INFO L78 Accepts]: Start accepts. Automaton has has 87 states, 87 states have (on average 3.942528735632184) internal successors, (343), 87 states have internal predecessors, (343), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 172 [2021-11-03 04:22:31,978 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:22:31,979 INFO L225 Difference]: With dead ends: 381 [2021-11-03 04:22:31,979 INFO L226 Difference]: Without dead ends: 266 [2021-11-03 04:22:31,984 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 712 GetRequests, 505 SyntacticMatches, 1 SemanticMatches, 206 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14638 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=6522, Invalid=36534, Unknown=0, NotChecked=0, Total=43056 [2021-11-03 04:22:31,984 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 266 states. [2021-11-03 04:22:32,004 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 266 to 179. [2021-11-03 04:22:32,005 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 179 states, 178 states have (on average 1.0168539325842696) internal successors, (181), 178 states have internal predecessors, (181), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:22:32,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 181 transitions. [2021-11-03 04:22:32,005 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 181 transitions. Word has length 172 [2021-11-03 04:22:32,006 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:22:32,006 INFO L470 AbstractCegarLoop]: Abstraction has 179 states and 181 transitions. [2021-11-03 04:22:32,006 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 87 states, 87 states have (on average 3.942528735632184) internal successors, (343), 87 states have internal predecessors, (343), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:22:32,006 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 181 transitions. [2021-11-03 04:22:32,007 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 179 [2021-11-03 04:22:32,007 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:22:32,008 INFO L513 BasicCegarLoop]: trace histogram [29, 29, 28, 28, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:22:32,049 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2021-11-03 04:22:32,235 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable849,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:22:32,236 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:22:32,236 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:22:32,236 INFO L85 PathProgramCache]: Analyzing trace with hash 1842551312, now seen corresponding path program 31 times [2021-11-03 04:22:32,236 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:22:32,236 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1671559960] [2021-11-03 04:22:32,236 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:22:32,236 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:22:32,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:22:33,333 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 1487 proven. 893 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:22:33,333 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:22:33,333 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1671559960] [2021-11-03 04:22:33,333 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1671559960] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:22:33,333 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [308419920] [2021-11-03 04:22:33,333 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-03 04:22:33,333 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:22:33,334 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:22:33,334 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:22:33,335 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2021-11-03 04:22:35,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:22:35,273 INFO L263 TraceCheckSpWp]: Trace formula consists of 667 conjuncts, 60 conjunts are in the unsatisfiable core [2021-11-03 04:22:35,275 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:22:37,165 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 1568 proven. 812 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:22:37,165 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:22:37,603 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 1568 proven. 812 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:22:37,603 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [308419920] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:22:37,603 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1363380591] [2021-11-03 04:22:37,604 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-03 04:22:37,604 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:22:37,604 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:22:37,604 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:22:37,605 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:22:37,606 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:37,607 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:22:37,607 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:37,607 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 04:22:37,608 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:22:37,608 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:37,608 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 04:22:37,609 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-03 04:22:37,613 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_38|], 10=[|v_#valid_39|]} [2021-11-03 04:22:37,617 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:22:37,620 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-03 04:22:37,620 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:37,620 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:22:37,621 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:37,621 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:22:37,621 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 04:22:37,621 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:37,622 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:37,625 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:22:37,625 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:22:37,626 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:22:37,629 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:22:37,629 INFO L388 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 23 treesize of output 22 [2021-11-03 04:22:37,630 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:37,631 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:22:37,631 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:37,631 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:22:37,632 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 04:22:37,632 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:37,633 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:37,634 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:37,634 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:22:37,634 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 04:22:37,634 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-03 04:22:37,638 INFO L180 QuantifierPusher]: treesize reduction 13, result has 87.3 percent of original size [2021-11-03 04:22:37,639 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:22:37,641 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:37,642 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:22:37,642 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:37,643 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:22:37,644 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 88 [2021-11-03 04:22:37,646 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.4 percent of original size [2021-11-03 04:22:37,648 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 97 [2021-11-03 04:22:37,650 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:37,654 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:37,654 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:37,655 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:37,657 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:37,658 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:37,659 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:37,661 INFO L180 QuantifierPusher]: treesize reduction 24, result has 72.4 percent of original size [2021-11-03 04:22:37,664 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 42 [2021-11-03 04:22:37,667 INFO L180 QuantifierPusher]: treesize reduction 24, result has 68.0 percent of original size [2021-11-03 04:22:37,667 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:22:37,668 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:37,669 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 04:22:37,669 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 34 [2021-11-03 04:22:37,672 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:37,673 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-03 04:22:37,675 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:37,677 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:37,679 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:37,685 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:37,686 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 121 [2021-11-03 04:22:37,688 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:37,689 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 141 [2021-11-03 04:22:37,691 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:37,708 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:37,709 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:37,709 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:37,709 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:37,710 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:37,710 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:37,712 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:37,716 INFO L180 QuantifierPusher]: treesize reduction 24, result has 77.1 percent of original size [2021-11-03 04:22:37,718 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-03 04:22:37,720 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:37,723 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:37,723 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:37,724 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:37,724 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:37,725 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:37,728 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:22:37,729 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:22:37,734 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:22:37,735 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:22:37,736 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 04:22:38,662 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 04:22:38,662 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:22:38,662 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 60, 60] total 91 [2021-11-03 04:22:38,662 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1677155568] [2021-11-03 04:22:38,663 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 91 states [2021-11-03 04:22:38,663 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:22:38,663 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 91 interpolants. [2021-11-03 04:22:38,664 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1949, Invalid=7951, Unknown=0, NotChecked=0, Total=9900 [2021-11-03 04:22:38,665 INFO L87 Difference]: Start difference. First operand 179 states and 181 transitions. Second operand has 91 states, 91 states have (on average 3.2747252747252746) internal successors, (298), 91 states have internal predecessors, (298), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:22:39,716 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:22:39,716 INFO L93 Difference]: Finished difference Result 387 states and 419 transitions. [2021-11-03 04:22:39,716 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2021-11-03 04:22:39,716 INFO L78 Accepts]: Start accepts. Automaton has has 91 states, 91 states have (on average 3.2747252747252746) internal successors, (298), 91 states have internal predecessors, (298), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 178 [2021-11-03 04:22:39,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:22:39,718 INFO L225 Difference]: With dead ends: 387 [2021-11-03 04:22:39,718 INFO L226 Difference]: Without dead ends: 268 [2021-11-03 04:22:39,719 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 621 GetRequests, 494 SyntacticMatches, 0 SemanticMatches, 127 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4182 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=3691, Invalid=12821, Unknown=0, NotChecked=0, Total=16512 [2021-11-03 04:22:39,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 268 states. [2021-11-03 04:22:39,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 268 to 181. [2021-11-03 04:22:39,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 181 states, 180 states have (on average 1.0166666666666666) internal successors, (183), 180 states have internal predecessors, (183), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:22:39,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 183 transitions. [2021-11-03 04:22:39,738 INFO L78 Accepts]: Start accepts. Automaton has 181 states and 183 transitions. Word has length 178 [2021-11-03 04:22:39,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:22:39,738 INFO L470 AbstractCegarLoop]: Abstraction has 181 states and 183 transitions. [2021-11-03 04:22:39,739 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 91 states, 91 states have (on average 3.2747252747252746) internal successors, (298), 91 states have internal predecessors, (298), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:22:39,739 INFO L276 IsEmpty]: Start isEmpty. Operand 181 states and 183 transitions. [2021-11-03 04:22:39,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 181 [2021-11-03 04:22:39,740 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:22:39,740 INFO L513 BasicCegarLoop]: trace histogram [30, 29, 29, 28, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:22:39,785 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2021-11-03 04:22:39,955 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable883 [2021-11-03 04:22:39,956 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:22:39,956 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:22:39,956 INFO L85 PathProgramCache]: Analyzing trace with hash -1196540875, now seen corresponding path program 32 times [2021-11-03 04:22:39,956 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:22:39,956 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [646234929] [2021-11-03 04:22:39,956 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:22:39,956 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:22:40,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:22:40,549 INFO L134 CoverageAnalysis]: Checked inductivity of 2438 backedges. 812 proven. 1626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:22:40,550 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:22:40,550 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [646234929] [2021-11-03 04:22:40,550 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [646234929] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:22:40,550 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1589304160] [2021-11-03 04:22:40,550 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-03 04:22:40,550 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:22:40,550 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:22:40,551 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:22:40,552 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2021-11-03 04:22:42,673 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2021-11-03 04:22:42,673 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 04:22:42,677 INFO L263 TraceCheckSpWp]: Trace formula consists of 677 conjuncts, 61 conjunts are in the unsatisfiable core [2021-11-03 04:22:42,679 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:22:43,122 INFO L134 CoverageAnalysis]: Checked inductivity of 2438 backedges. 870 proven. 1568 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:22:43,122 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:22:43,570 INFO L134 CoverageAnalysis]: Checked inductivity of 2438 backedges. 870 proven. 1568 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:22:43,570 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1589304160] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:22:43,570 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1499723109] [2021-11-03 04:22:43,571 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-03 04:22:43,572 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:22:43,572 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:22:43,572 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:22:43,572 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:22:43,592 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:43,592 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:22:43,593 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:43,593 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 04:22:43,593 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:22:43,593 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:43,594 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 04:22:43,594 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-03 04:22:43,595 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_39|], 10=[|v_#valid_40|]} [2021-11-03 04:22:43,600 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:22:43,600 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-03 04:22:43,600 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:43,601 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:22:43,601 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:43,601 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:22:43,601 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 04:22:43,602 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:43,603 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:43,605 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:22:43,606 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:22:43,606 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:22:43,610 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:22:43,610 INFO L388 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 23 treesize of output 22 [2021-11-03 04:22:43,611 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:43,612 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:22:43,612 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:43,613 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:22:43,613 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 04:22:43,613 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:43,614 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:43,615 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:43,615 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:22:43,616 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 04:22:43,616 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-03 04:22:43,619 INFO L180 QuantifierPusher]: treesize reduction 13, result has 87.3 percent of original size [2021-11-03 04:22:43,620 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:22:43,622 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:43,623 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:22:43,624 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:43,625 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:22:43,625 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 88 [2021-11-03 04:22:43,627 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.4 percent of original size [2021-11-03 04:22:43,629 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 04:22:43,631 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:43,634 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:43,635 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:43,635 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:43,636 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:43,636 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:43,637 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:43,639 INFO L180 QuantifierPusher]: treesize reduction 24, result has 72.4 percent of original size [2021-11-03 04:22:43,641 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 42 [2021-11-03 04:22:43,644 INFO L180 QuantifierPusher]: treesize reduction 24, result has 68.0 percent of original size [2021-11-03 04:22:43,645 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:22:43,646 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:43,647 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 04:22:43,647 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 34 [2021-11-03 04:22:43,657 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:43,659 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 75 [2021-11-03 04:22:43,662 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:43,665 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:43,669 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:43,675 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:43,678 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 132 [2021-11-03 04:22:43,680 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:43,683 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 152 [2021-11-03 04:22:43,686 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:43,695 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:43,695 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:43,696 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:43,696 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:43,696 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:43,697 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:43,698 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:43,701 INFO L180 QuantifierPusher]: treesize reduction 24, result has 77.1 percent of original size [2021-11-03 04:22:43,702 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-03 04:22:43,704 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:43,753 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:43,754 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:43,754 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:43,754 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:43,756 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:43,758 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:22:43,760 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:22:43,764 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:22:43,765 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:22:43,767 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 04:22:44,415 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 04:22:44,415 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:22:44,415 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 35 [2021-11-03 04:22:44,415 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [784787940] [2021-11-03 04:22:44,416 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-11-03 04:22:44,416 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:22:44,417 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-11-03 04:22:44,417 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=583, Invalid=1397, Unknown=0, NotChecked=0, Total=1980 [2021-11-03 04:22:44,417 INFO L87 Difference]: Start difference. First operand 181 states and 183 transitions. Second operand has 36 states, 36 states have (on average 5.583333333333333) internal successors, (201), 35 states have internal predecessors, (201), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:22:44,979 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:22:44,979 INFO L93 Difference]: Finished difference Result 198 states and 201 transitions. [2021-11-03 04:22:44,980 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2021-11-03 04:22:44,980 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 5.583333333333333) internal successors, (201), 35 states have internal predecessors, (201), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 180 [2021-11-03 04:22:44,980 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:22:44,981 INFO L225 Difference]: With dead ends: 198 [2021-11-03 04:22:44,981 INFO L226 Difference]: Without dead ends: 196 [2021-11-03 04:22:44,982 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 630 GetRequests, 554 SyntacticMatches, 1 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1659 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1708, Invalid=4144, Unknown=0, NotChecked=0, Total=5852 [2021-11-03 04:22:44,982 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2021-11-03 04:22:45,000 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 189. [2021-11-03 04:22:45,001 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 189 states, 188 states have (on average 1.0159574468085106) internal successors, (191), 188 states have internal predecessors, (191), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:22:45,001 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 189 states to 189 states and 191 transitions. [2021-11-03 04:22:45,002 INFO L78 Accepts]: Start accepts. Automaton has 189 states and 191 transitions. Word has length 180 [2021-11-03 04:22:45,002 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:22:45,002 INFO L470 AbstractCegarLoop]: Abstraction has 189 states and 191 transitions. [2021-11-03 04:22:45,002 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 5.583333333333333) internal successors, (201), 35 states have internal predecessors, (201), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:22:45,002 INFO L276 IsEmpty]: Start isEmpty. Operand 189 states and 191 transitions. [2021-11-03 04:22:45,003 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 189 [2021-11-03 04:22:45,004 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:22:45,004 INFO L513 BasicCegarLoop]: trace histogram [31, 30, 30, 30, 30, 29, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:22:45,050 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2021-11-03 04:22:45,223 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable910 [2021-11-03 04:22:45,224 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:22:45,224 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:22:45,224 INFO L85 PathProgramCache]: Analyzing trace with hash -1867937509, now seen corresponding path program 33 times [2021-11-03 04:22:45,224 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:22:45,224 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [674743713] [2021-11-03 04:22:45,224 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:22:45,224 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:22:45,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:22:46,440 INFO L134 CoverageAnalysis]: Checked inductivity of 2670 backedges. 1713 proven. 957 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:22:46,440 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:22:46,440 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [674743713] [2021-11-03 04:22:46,440 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [674743713] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:22:46,440 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [446528669] [2021-11-03 04:22:46,440 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-03 04:22:46,440 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:22:46,441 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:22:46,441 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:22:46,442 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2021-11-03 04:22:48,664 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-03 04:22:48,664 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 04:22:48,668 INFO L263 TraceCheckSpWp]: Trace formula consists of 701 conjuncts, 63 conjunts are in the unsatisfiable core [2021-11-03 04:22:48,672 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:22:50,910 INFO L134 CoverageAnalysis]: Checked inductivity of 2670 backedges. 1800 proven. 870 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:22:50,910 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:22:51,448 INFO L134 CoverageAnalysis]: Checked inductivity of 2670 backedges. 1800 proven. 870 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:22:51,448 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [446528669] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:22:51,448 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [233035799] [2021-11-03 04:22:51,449 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-03 04:22:51,449 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:22:51,450 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:22:51,450 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:22:51,450 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:22:51,464 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:51,465 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:22:51,465 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:51,466 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 04:22:51,466 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:22:51,467 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:51,467 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 04:22:51,468 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-03 04:22:51,470 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_40|], 10=[|v_#valid_41|]} [2021-11-03 04:22:51,474 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:22:51,475 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-03 04:22:51,476 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:51,476 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:22:51,476 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:51,477 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:22:51,477 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 04:22:51,477 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:51,479 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:51,482 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:22:51,483 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:22:51,484 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:22:51,487 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:22:51,488 INFO L388 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 23 treesize of output 22 [2021-11-03 04:22:51,488 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:51,490 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:22:51,490 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:51,490 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:22:51,491 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 04:22:51,491 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:51,493 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:51,494 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:51,495 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:22:51,495 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 04:22:51,495 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-03 04:22:51,500 INFO L180 QuantifierPusher]: treesize reduction 13, result has 87.3 percent of original size [2021-11-03 04:22:51,502 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:22:51,504 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:51,506 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:22:51,507 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:51,508 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:22:51,509 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 88 [2021-11-03 04:22:51,512 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.4 percent of original size [2021-11-03 04:22:51,514 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 04:22:51,517 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:51,522 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:51,523 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:51,523 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:51,524 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:51,525 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:51,527 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:51,531 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:51,535 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-03 04:22:51,537 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:51,543 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:51,544 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:51,544 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:51,545 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:51,547 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:51,549 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:51,552 INFO L180 QuantifierPusher]: treesize reduction 24, result has 72.4 percent of original size [2021-11-03 04:22:51,555 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 42 [2021-11-03 04:22:51,559 INFO L180 QuantifierPusher]: treesize reduction 24, result has 68.0 percent of original size [2021-11-03 04:22:51,560 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:22:51,560 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:51,562 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 04:22:51,562 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 34 [2021-11-03 04:22:51,565 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:51,566 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-03 04:22:51,568 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:51,572 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:51,575 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:51,582 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:51,584 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 121 [2021-11-03 04:22:51,585 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:51,588 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 141 [2021-11-03 04:22:51,590 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:51,600 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:51,601 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:51,602 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:51,602 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:51,603 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:51,603 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:51,604 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:51,607 INFO L180 QuantifierPusher]: treesize reduction 24, result has 77.1 percent of original size [2021-11-03 04:22:51,608 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-03 04:22:51,610 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:51,613 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:51,613 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:51,614 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:51,614 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:51,615 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:51,618 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:22:51,619 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:22:51,623 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:22:51,625 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:22:51,626 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 04:22:52,587 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 04:22:52,587 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:22:52,587 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 63, 63] total 98 [2021-11-03 04:22:52,587 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [522546144] [2021-11-03 04:22:52,588 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 98 states [2021-11-03 04:22:52,588 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:22:52,589 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2021-11-03 04:22:52,589 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2270, Invalid=9072, Unknown=0, NotChecked=0, Total=11342 [2021-11-03 04:22:52,590 INFO L87 Difference]: Start difference. First operand 189 states and 191 transitions. Second operand has 98 states, 98 states have (on average 3.316326530612245) internal successors, (325), 98 states have internal predecessors, (325), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:22:54,409 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:22:54,409 INFO L93 Difference]: Finished difference Result 532 states and 567 transitions. [2021-11-03 04:22:54,409 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2021-11-03 04:22:54,409 INFO L78 Accepts]: Start accepts. Automaton has has 98 states, 98 states have (on average 3.316326530612245) internal successors, (325), 98 states have internal predecessors, (325), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 188 [2021-11-03 04:22:54,409 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:22:54,410 INFO L225 Difference]: With dead ends: 532 [2021-11-03 04:22:54,410 INFO L226 Difference]: Without dead ends: 286 [2021-11-03 04:22:54,412 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 686 GetRequests, 520 SyntacticMatches, 0 SemanticMatches, 166 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7374 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=6206, Invalid=21850, Unknown=0, NotChecked=0, Total=28056 [2021-11-03 04:22:54,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 286 states. [2021-11-03 04:22:54,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 286 to 193. [2021-11-03 04:22:54,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 193 states, 192 states have (on average 1.015625) internal successors, (195), 192 states have internal predecessors, (195), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:22:54,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 193 states and 195 transitions. [2021-11-03 04:22:54,425 INFO L78 Accepts]: Start accepts. Automaton has 193 states and 195 transitions. Word has length 188 [2021-11-03 04:22:54,426 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:22:54,426 INFO L470 AbstractCegarLoop]: Abstraction has 193 states and 195 transitions. [2021-11-03 04:22:54,426 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 98 states, 98 states have (on average 3.316326530612245) internal successors, (325), 98 states have internal predecessors, (325), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:22:54,426 INFO L276 IsEmpty]: Start isEmpty. Operand 193 states and 195 transitions. [2021-11-03 04:22:54,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 193 [2021-11-03 04:22:54,427 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:22:54,428 INFO L513 BasicCegarLoop]: trace histogram [32, 31, 31, 30, 30, 30, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:22:54,471 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2021-11-03 04:22:54,647 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable937,34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:22:54,647 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:22:54,648 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:22:54,648 INFO L85 PathProgramCache]: Analyzing trace with hash -457698395, now seen corresponding path program 34 times [2021-11-03 04:22:54,648 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:22:54,648 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1672964463] [2021-11-03 04:22:54,648 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:22:54,648 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:22:54,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:22:55,300 INFO L134 CoverageAnalysis]: Checked inductivity of 2792 backedges. 930 proven. 1862 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:22:55,300 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:22:55,301 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1672964463] [2021-11-03 04:22:55,301 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1672964463] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:22:55,301 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1222189165] [2021-11-03 04:22:55,301 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-03 04:22:55,301 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:22:55,301 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:22:55,302 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:22:55,302 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2021-11-03 04:22:57,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:22:57,620 INFO L263 TraceCheckSpWp]: Trace formula consists of 721 conjuncts, 65 conjunts are in the unsatisfiable core [2021-11-03 04:22:57,622 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:22:58,121 INFO L134 CoverageAnalysis]: Checked inductivity of 2792 backedges. 992 proven. 1800 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:22:58,121 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:22:58,731 INFO L134 CoverageAnalysis]: Checked inductivity of 2792 backedges. 992 proven. 1800 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:22:58,732 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1222189165] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:22:58,732 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2012007410] [2021-11-03 04:22:58,733 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-03 04:22:58,733 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:22:58,734 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:22:58,734 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:22:58,734 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:22:58,737 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:58,738 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:22:58,738 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:58,739 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 04:22:58,739 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:22:58,739 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:58,740 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 04:22:58,741 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-03 04:22:58,743 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_41|], 10=[|v_#valid_42|]} [2021-11-03 04:22:58,748 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:22:58,749 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-03 04:22:58,750 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:58,750 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:22:58,750 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:58,751 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:22:58,751 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 04:22:58,751 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:58,753 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:58,756 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:22:58,757 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:22:58,758 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:22:58,762 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:22:58,763 INFO L388 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 23 treesize of output 22 [2021-11-03 04:22:58,763 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:58,765 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:22:58,765 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:58,766 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:22:58,766 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 04:22:58,766 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:58,768 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:58,769 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:58,770 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:22:58,770 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 04:22:58,771 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-03 04:22:58,775 INFO L180 QuantifierPusher]: treesize reduction 13, result has 87.3 percent of original size [2021-11-03 04:22:58,777 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:22:58,780 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:58,782 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:22:58,782 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:58,784 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:22:58,785 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 88 [2021-11-03 04:22:58,787 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.4 percent of original size [2021-11-03 04:22:58,790 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 97 [2021-11-03 04:22:58,792 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:58,797 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:58,799 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:58,800 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:58,800 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:58,801 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:58,803 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:58,806 INFO L180 QuantifierPusher]: treesize reduction 24, result has 72.4 percent of original size [2021-11-03 04:22:58,808 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 42 [2021-11-03 04:22:58,812 INFO L180 QuantifierPusher]: treesize reduction 24, result has 68.0 percent of original size [2021-11-03 04:22:58,813 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:22:58,814 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:58,815 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 04:22:58,816 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 34 [2021-11-03 04:22:58,818 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:58,820 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 73 [2021-11-03 04:22:58,822 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:58,826 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:58,829 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:58,836 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:58,838 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 121 [2021-11-03 04:22:58,841 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:22:58,843 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 141 [2021-11-03 04:22:58,846 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:58,855 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:58,856 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:58,857 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:58,860 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:58,861 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:58,862 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:58,864 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:58,868 INFO L180 QuantifierPusher]: treesize reduction 24, result has 77.1 percent of original size [2021-11-03 04:22:58,870 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-03 04:22:58,872 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:58,877 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:58,878 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:58,878 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:58,879 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:58,880 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:22:58,882 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:22:58,884 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:22:58,888 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:22:58,890 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:22:58,892 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 04:22:59,551 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 04:22:59,551 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:22:59,551 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 37 [2021-11-03 04:22:59,552 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [177701030] [2021-11-03 04:22:59,552 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-11-03 04:22:59,552 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:22:59,553 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-11-03 04:22:59,553 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=650, Invalid=1512, Unknown=0, NotChecked=0, Total=2162 [2021-11-03 04:22:59,553 INFO L87 Difference]: Start difference. First operand 193 states and 195 transitions. Second operand has 38 states, 38 states have (on average 5.605263157894737) internal successors, (213), 37 states have internal predecessors, (213), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:23:00,161 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:23:00,161 INFO L93 Difference]: Finished difference Result 210 states and 213 transitions. [2021-11-03 04:23:00,161 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2021-11-03 04:23:00,161 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 5.605263157894737) internal successors, (213), 37 states have internal predecessors, (213), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 192 [2021-11-03 04:23:00,162 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:23:00,163 INFO L225 Difference]: With dead ends: 210 [2021-11-03 04:23:00,163 INFO L226 Difference]: Without dead ends: 208 [2021-11-03 04:23:00,164 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 672 GetRequests, 592 SyntacticMatches, 1 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1831 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1913, Invalid=4567, Unknown=0, NotChecked=0, Total=6480 [2021-11-03 04:23:00,164 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2021-11-03 04:23:00,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 201. [2021-11-03 04:23:00,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 201 states, 200 states have (on average 1.015) internal successors, (203), 200 states have internal predecessors, (203), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:23:00,177 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201 states to 201 states and 203 transitions. [2021-11-03 04:23:00,177 INFO L78 Accepts]: Start accepts. Automaton has 201 states and 203 transitions. Word has length 192 [2021-11-03 04:23:00,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:23:00,177 INFO L470 AbstractCegarLoop]: Abstraction has 201 states and 203 transitions. [2021-11-03 04:23:00,177 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 5.605263157894737) internal successors, (213), 37 states have internal predecessors, (213), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:23:00,177 INFO L276 IsEmpty]: Start isEmpty. Operand 201 states and 203 transitions. [2021-11-03 04:23:00,178 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 201 [2021-11-03 04:23:00,178 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:23:00,178 INFO L513 BasicCegarLoop]: trace histogram [33, 32, 32, 32, 32, 31, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:23:00,208 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Ended with exit code 0 [2021-11-03 04:23:00,378 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable971,35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:23:00,379 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:23:00,379 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:23:00,379 INFO L85 PathProgramCache]: Analyzing trace with hash -86183797, now seen corresponding path program 35 times [2021-11-03 04:23:00,379 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:23:00,379 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [453547133] [2021-11-03 04:23:00,379 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:23:00,380 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:23:00,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:23:01,805 INFO L134 CoverageAnalysis]: Checked inductivity of 3040 backedges. 1955 proven. 1085 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:23:01,805 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:23:01,805 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [453547133] [2021-11-03 04:23:01,805 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [453547133] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:23:01,805 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [555000182] [2021-11-03 04:23:01,806 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-03 04:23:01,806 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:23:01,806 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:23:01,806 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:23:01,808 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2021-11-03 04:23:04,382 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 33 check-sat command(s) [2021-11-03 04:23:04,382 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 04:23:04,386 INFO L263 TraceCheckSpWp]: Trace formula consists of 745 conjuncts, 67 conjunts are in the unsatisfiable core [2021-11-03 04:23:04,389 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:23:06,630 INFO L134 CoverageAnalysis]: Checked inductivity of 3040 backedges. 2048 proven. 992 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:23:06,630 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:23:07,307 INFO L134 CoverageAnalysis]: Checked inductivity of 3040 backedges. 2048 proven. 992 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:23:07,308 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [555000182] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:23:07,308 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1374703777] [2021-11-03 04:23:07,309 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-03 04:23:07,309 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:23:07,309 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:23:07,309 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:23:07,309 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:23:07,311 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:07,311 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:23:07,312 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:07,312 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 04:23:07,312 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:23:07,312 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:07,313 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 04:23:07,313 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-03 04:23:07,315 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_42|], 10=[|v_#valid_43|]} [2021-11-03 04:23:07,319 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:23:07,319 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-03 04:23:07,319 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:07,320 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:23:07,320 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:07,320 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:23:07,321 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 04:23:07,321 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:07,322 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:07,324 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:23:07,325 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:23:07,326 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:23:07,328 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:23:07,329 INFO L388 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 23 treesize of output 22 [2021-11-03 04:23:07,329 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:07,330 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:23:07,331 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:07,332 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:23:07,332 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 04:23:07,332 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:07,334 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:07,334 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:07,335 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:23:07,335 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 04:23:07,335 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-03 04:23:07,338 INFO L180 QuantifierPusher]: treesize reduction 13, result has 87.3 percent of original size [2021-11-03 04:23:07,339 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:23:07,341 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:07,343 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:23:07,343 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:07,345 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:23:07,345 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 88 [2021-11-03 04:23:07,347 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.4 percent of original size [2021-11-03 04:23:07,349 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 04:23:07,351 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:07,354 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:07,355 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:07,355 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:07,356 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:07,357 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:07,359 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:07,361 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:07,364 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-03 04:23:07,366 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:07,370 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:07,371 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:07,371 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:07,372 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:07,372 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:07,388 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:07,391 INFO L180 QuantifierPusher]: treesize reduction 24, result has 72.4 percent of original size [2021-11-03 04:23:07,393 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 42 [2021-11-03 04:23:07,396 INFO L180 QuantifierPusher]: treesize reduction 24, result has 68.0 percent of original size [2021-11-03 04:23:07,397 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:23:07,398 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:07,399 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 04:23:07,399 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 34 [2021-11-03 04:23:07,401 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:07,402 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 75 [2021-11-03 04:23:07,404 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:07,406 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:07,410 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:07,414 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:07,416 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 132 [2021-11-03 04:23:07,417 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:07,419 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 152 [2021-11-03 04:23:07,421 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:07,428 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:07,429 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:07,429 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:07,429 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:07,430 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:07,431 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:07,433 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:07,437 INFO L180 QuantifierPusher]: treesize reduction 24, result has 77.1 percent of original size [2021-11-03 04:23:07,438 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-03 04:23:07,440 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:07,443 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:07,443 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:07,444 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:07,444 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:07,445 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:07,448 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:23:07,449 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:23:07,456 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:23:07,457 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:23:07,459 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 04:23:08,450 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 04:23:08,450 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:23:08,450 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67, 67] total 104 [2021-11-03 04:23:08,450 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [266542142] [2021-11-03 04:23:08,451 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 104 states [2021-11-03 04:23:08,451 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:23:08,452 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 104 interpolants. [2021-11-03 04:23:08,453 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2546, Invalid=10110, Unknown=0, NotChecked=0, Total=12656 [2021-11-03 04:23:08,453 INFO L87 Difference]: Start difference. First operand 201 states and 203 transitions. Second operand has 104 states, 104 states have (on average 3.3173076923076925) internal successors, (345), 104 states have internal predecessors, (345), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:23:10,563 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:23:10,564 INFO L93 Difference]: Finished difference Result 566 states and 603 transitions. [2021-11-03 04:23:10,564 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2021-11-03 04:23:10,564 INFO L78 Accepts]: Start accepts. Automaton has has 104 states, 104 states have (on average 3.3173076923076925) internal successors, (345), 104 states have internal predecessors, (345), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 200 [2021-11-03 04:23:10,564 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:23:10,565 INFO L225 Difference]: With dead ends: 566 [2021-11-03 04:23:10,565 INFO L226 Difference]: Without dead ends: 304 [2021-11-03 04:23:10,568 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 730 GetRequests, 554 SyntacticMatches, 0 SemanticMatches, 176 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8246 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=7000, Invalid=24506, Unknown=0, NotChecked=0, Total=31506 [2021-11-03 04:23:10,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 304 states. [2021-11-03 04:23:10,588 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 304 to 205. [2021-11-03 04:23:10,588 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 205 states, 204 states have (on average 1.0147058823529411) internal successors, (207), 204 states have internal predecessors, (207), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:23:10,589 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 207 transitions. [2021-11-03 04:23:10,589 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 207 transitions. Word has length 200 [2021-11-03 04:23:10,590 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:23:10,590 INFO L470 AbstractCegarLoop]: Abstraction has 205 states and 207 transitions. [2021-11-03 04:23:10,590 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 104 states, 104 states have (on average 3.3173076923076925) internal successors, (345), 104 states have internal predecessors, (345), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:23:10,590 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 207 transitions. [2021-11-03 04:23:10,591 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 205 [2021-11-03 04:23:10,591 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:23:10,592 INFO L513 BasicCegarLoop]: trace histogram [34, 33, 33, 32, 32, 32, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:23:10,629 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2021-11-03 04:23:10,806 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable998 [2021-11-03 04:23:10,806 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:23:10,806 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:23:10,806 INFO L85 PathProgramCache]: Analyzing trace with hash -569508843, now seen corresponding path program 36 times [2021-11-03 04:23:10,807 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:23:10,807 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1357008010] [2021-11-03 04:23:10,807 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:23:10,807 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:23:10,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:23:11,483 INFO L134 CoverageAnalysis]: Checked inductivity of 3170 backedges. 1056 proven. 2114 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:23:11,483 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:23:11,483 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1357008010] [2021-11-03 04:23:11,483 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1357008010] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:23:11,483 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [585791129] [2021-11-03 04:23:11,483 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-03 04:23:11,483 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:23:11,483 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:23:11,484 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:23:11,485 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2021-11-03 04:23:14,130 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-03 04:23:14,130 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 04:23:14,134 INFO L263 TraceCheckSpWp]: Trace formula consists of 765 conjuncts, 69 conjunts are in the unsatisfiable core [2021-11-03 04:23:14,136 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:23:14,624 INFO L134 CoverageAnalysis]: Checked inductivity of 3170 backedges. 1122 proven. 2048 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:23:14,624 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:23:15,121 INFO L134 CoverageAnalysis]: Checked inductivity of 3170 backedges. 1122 proven. 2048 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:23:15,121 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [585791129] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:23:15,121 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1071709601] [2021-11-03 04:23:15,122 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-03 04:23:15,122 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:23:15,122 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:23:15,122 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:23:15,122 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:23:15,124 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:15,125 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:23:15,125 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:15,125 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 04:23:15,125 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:23:15,126 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:15,126 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 04:23:15,127 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-03 04:23:15,128 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_43|], 10=[|v_#valid_44|]} [2021-11-03 04:23:15,132 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:23:15,133 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-03 04:23:15,133 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:15,133 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:23:15,133 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:15,134 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:23:15,134 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 04:23:15,134 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:15,135 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:15,138 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:23:15,138 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:23:15,139 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:23:15,142 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:23:15,142 INFO L388 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 23 treesize of output 22 [2021-11-03 04:23:15,143 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:15,144 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:23:15,144 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:15,144 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:23:15,145 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 04:23:15,145 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:15,146 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:15,147 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:15,147 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:23:15,147 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 04:23:15,148 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-03 04:23:15,151 INFO L180 QuantifierPusher]: treesize reduction 13, result has 87.3 percent of original size [2021-11-03 04:23:15,152 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:23:15,154 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:15,155 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:23:15,155 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:15,156 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:23:15,157 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 88 [2021-11-03 04:23:15,159 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.4 percent of original size [2021-11-03 04:23:15,161 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 97 [2021-11-03 04:23:15,162 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:15,166 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:15,167 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:15,168 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:15,168 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:15,168 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:15,170 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:15,172 INFO L180 QuantifierPusher]: treesize reduction 24, result has 72.4 percent of original size [2021-11-03 04:23:15,174 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 42 [2021-11-03 04:23:15,183 INFO L180 QuantifierPusher]: treesize reduction 24, result has 68.0 percent of original size [2021-11-03 04:23:15,184 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:23:15,185 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:15,186 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 04:23:15,187 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 34 [2021-11-03 04:23:15,189 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:15,191 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 73 [2021-11-03 04:23:15,193 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:15,197 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:15,199 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:15,204 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:15,205 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 121 [2021-11-03 04:23:15,207 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:15,209 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 141 [2021-11-03 04:23:15,211 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:15,218 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:15,218 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:15,219 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:15,219 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:15,220 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:15,220 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:15,221 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:15,224 INFO L180 QuantifierPusher]: treesize reduction 24, result has 77.1 percent of original size [2021-11-03 04:23:15,226 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-03 04:23:15,227 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:15,230 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:15,231 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:15,231 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:15,231 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:15,232 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:15,235 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:23:15,236 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:23:15,241 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:23:15,242 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:23:15,243 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 04:23:15,917 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 04:23:15,917 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:23:15,917 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 39 [2021-11-03 04:23:15,918 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [486374647] [2021-11-03 04:23:15,918 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2021-11-03 04:23:15,918 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:23:15,918 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-11-03 04:23:15,919 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=721, Invalid=1631, Unknown=0, NotChecked=0, Total=2352 [2021-11-03 04:23:15,919 INFO L87 Difference]: Start difference. First operand 205 states and 207 transitions. Second operand has 40 states, 40 states have (on average 5.625) internal successors, (225), 39 states have internal predecessors, (225), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:23:16,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:23:16,573 INFO L93 Difference]: Finished difference Result 222 states and 225 transitions. [2021-11-03 04:23:16,573 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2021-11-03 04:23:16,574 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 5.625) internal successors, (225), 39 states have internal predecessors, (225), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 204 [2021-11-03 04:23:16,574 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:23:16,575 INFO L225 Difference]: With dead ends: 222 [2021-11-03 04:23:16,575 INFO L226 Difference]: Without dead ends: 220 [2021-11-03 04:23:16,575 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 714 GetRequests, 630 SyntacticMatches, 1 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2011 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=2130, Invalid=5010, Unknown=0, NotChecked=0, Total=7140 [2021-11-03 04:23:16,576 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 220 states. [2021-11-03 04:23:16,596 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 220 to 213. [2021-11-03 04:23:16,597 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 213 states, 212 states have (on average 1.0141509433962264) internal successors, (215), 212 states have internal predecessors, (215), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:23:16,598 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 213 states to 213 states and 215 transitions. [2021-11-03 04:23:16,598 INFO L78 Accepts]: Start accepts. Automaton has 213 states and 215 transitions. Word has length 204 [2021-11-03 04:23:16,598 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:23:16,598 INFO L470 AbstractCegarLoop]: Abstraction has 213 states and 215 transitions. [2021-11-03 04:23:16,598 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 5.625) internal successors, (225), 39 states have internal predecessors, (225), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:23:16,599 INFO L276 IsEmpty]: Start isEmpty. Operand 213 states and 215 transitions. [2021-11-03 04:23:16,600 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 213 [2021-11-03 04:23:16,600 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:23:16,600 INFO L513 BasicCegarLoop]: trace histogram [35, 34, 34, 34, 34, 33, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:23:16,649 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Forceful destruction successful, exit code 0 [2021-11-03 04:23:16,815 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1032,37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:23:16,816 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:23:16,816 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:23:16,816 INFO L85 PathProgramCache]: Analyzing trace with hash -1313117957, now seen corresponding path program 37 times [2021-11-03 04:23:16,816 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:23:16,816 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [144153698] [2021-11-03 04:23:16,816 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:23:16,816 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:23:16,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:23:18,495 INFO L134 CoverageAnalysis]: Checked inductivity of 3434 backedges. 2213 proven. 1221 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:23:18,495 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:23:18,495 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [144153698] [2021-11-03 04:23:18,496 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [144153698] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:23:18,496 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [202601714] [2021-11-03 04:23:18,496 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-03 04:23:18,496 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:23:18,496 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:23:18,497 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:23:18,497 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2021-11-03 04:23:21,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:23:21,205 INFO L263 TraceCheckSpWp]: Trace formula consists of 789 conjuncts, 70 conjunts are in the unsatisfiable core [2021-11-03 04:23:21,207 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:23:23,616 INFO L134 CoverageAnalysis]: Checked inductivity of 3434 backedges. 2310 proven. 1122 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-03 04:23:23,616 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:23:24,130 INFO L134 CoverageAnalysis]: Checked inductivity of 3434 backedges. 2310 proven. 1122 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-03 04:23:24,131 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [202601714] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:23:24,131 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [628734420] [2021-11-03 04:23:24,132 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-03 04:23:24,132 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:23:24,132 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:23:24,132 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:23:24,132 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:23:24,143 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:24,143 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:23:24,144 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:24,144 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 04:23:24,144 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:23:24,145 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:24,145 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 04:23:24,145 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-03 04:23:24,148 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_44|], 10=[|v_#valid_45|]} [2021-11-03 04:23:24,152 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:23:24,153 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-03 04:23:24,153 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:24,154 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:23:24,154 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:24,154 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:23:24,154 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 04:23:24,155 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:24,157 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:24,159 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:23:24,160 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:23:24,160 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:23:24,163 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:23:24,164 INFO L388 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 23 treesize of output 22 [2021-11-03 04:23:24,165 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:24,166 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:23:24,166 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:24,166 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:23:24,167 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 04:23:24,167 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:24,168 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:24,169 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:24,169 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:23:24,169 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 04:23:24,170 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-03 04:23:24,173 INFO L180 QuantifierPusher]: treesize reduction 13, result has 87.3 percent of original size [2021-11-03 04:23:24,174 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:23:24,176 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:24,186 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:23:24,186 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:24,187 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:23:24,188 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 88 [2021-11-03 04:23:24,189 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.4 percent of original size [2021-11-03 04:23:24,191 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 91 [2021-11-03 04:23:24,193 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:24,197 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:24,197 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:24,198 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:24,198 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:24,199 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:24,200 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:24,203 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:24,206 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 101 [2021-11-03 04:23:24,208 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:24,212 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:24,213 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:24,213 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:24,214 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:24,214 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:24,215 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:24,218 INFO L180 QuantifierPusher]: treesize reduction 24, result has 72.4 percent of original size [2021-11-03 04:23:24,220 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 42 [2021-11-03 04:23:24,222 INFO L180 QuantifierPusher]: treesize reduction 24, result has 68.0 percent of original size [2021-11-03 04:23:24,223 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:23:24,224 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:24,225 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 04:23:24,225 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 34 [2021-11-03 04:23:24,227 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:24,228 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-03 04:23:24,232 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:24,234 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:24,237 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:24,241 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:24,243 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 121 [2021-11-03 04:23:24,244 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:24,246 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 141 [2021-11-03 04:23:24,248 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:24,254 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:24,255 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:24,255 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:24,256 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:24,256 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:24,256 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:24,258 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:24,276 INFO L180 QuantifierPusher]: treesize reduction 24, result has 77.1 percent of original size [2021-11-03 04:23:24,278 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-03 04:23:24,280 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:24,285 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:24,286 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:24,287 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:24,287 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:24,289 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:24,293 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:23:24,295 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:23:24,300 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:23:24,301 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:23:24,303 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 04:23:25,309 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 04:23:25,309 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:23:25,310 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 70, 70] total 107 [2021-11-03 04:23:25,310 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1658563133] [2021-11-03 04:23:25,310 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 107 states [2021-11-03 04:23:25,310 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:23:25,311 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 107 interpolants. [2021-11-03 04:23:25,312 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2655, Invalid=10685, Unknown=0, NotChecked=0, Total=13340 [2021-11-03 04:23:25,312 INFO L87 Difference]: Start difference. First operand 213 states and 215 transitions. Second operand has 107 states, 107 states have (on average 3.3271028037383177) internal successors, (356), 107 states have internal predecessors, (356), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:23:26,597 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:23:26,597 INFO L93 Difference]: Finished difference Result 458 states and 495 transitions. [2021-11-03 04:23:26,597 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2021-11-03 04:23:26,597 INFO L78 Accepts]: Start accepts. Automaton has has 107 states, 107 states have (on average 3.3271028037383177) internal successors, (356), 107 states have internal predecessors, (356), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 212 [2021-11-03 04:23:26,597 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:23:26,598 INFO L225 Difference]: With dead ends: 458 [2021-11-03 04:23:26,598 INFO L226 Difference]: Without dead ends: 317 [2021-11-03 04:23:26,600 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 739 GetRequests, 591 SyntacticMatches, 0 SemanticMatches, 148 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5608 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=5037, Invalid=17313, Unknown=0, NotChecked=0, Total=22350 [2021-11-03 04:23:26,600 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 317 states. [2021-11-03 04:23:26,614 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 317 to 215. [2021-11-03 04:23:26,615 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 215 states, 214 states have (on average 1.014018691588785) internal successors, (217), 214 states have internal predecessors, (217), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:23:26,615 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 215 states to 215 states and 217 transitions. [2021-11-03 04:23:26,615 INFO L78 Accepts]: Start accepts. Automaton has 215 states and 217 transitions. Word has length 212 [2021-11-03 04:23:26,615 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:23:26,615 INFO L470 AbstractCegarLoop]: Abstraction has 215 states and 217 transitions. [2021-11-03 04:23:26,616 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 107 states, 107 states have (on average 3.3271028037383177) internal successors, (356), 107 states have internal predecessors, (356), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:23:26,616 INFO L276 IsEmpty]: Start isEmpty. Operand 215 states and 217 transitions. [2021-11-03 04:23:26,616 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 215 [2021-11-03 04:23:26,616 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:23:26,617 INFO L513 BasicCegarLoop]: trace histogram [35, 35, 34, 34, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:23:26,648 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Forceful destruction successful, exit code 0 [2021-11-03 04:23:26,817 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1059,38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:23:26,817 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:23:26,818 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:23:26,818 INFO L85 PathProgramCache]: Analyzing trace with hash 748798432, now seen corresponding path program 38 times [2021-11-03 04:23:26,818 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:23:26,818 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1530646197] [2021-11-03 04:23:26,818 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:23:26,818 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:23:26,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:23:28,366 INFO L134 CoverageAnalysis]: Checked inductivity of 3502 backedges. 2213 proven. 1289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:23:28,366 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:23:28,366 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1530646197] [2021-11-03 04:23:28,366 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1530646197] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:23:28,366 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [905418992] [2021-11-03 04:23:28,367 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-03 04:23:28,367 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:23:28,367 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:23:28,367 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:23:28,372 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2021-11-03 04:23:31,342 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 35 check-sat command(s) [2021-11-03 04:23:31,342 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 04:23:31,347 INFO L263 TraceCheckSpWp]: Trace formula consists of 799 conjuncts, 72 conjunts are in the unsatisfiable core [2021-11-03 04:23:31,350 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:23:33,301 INFO L134 CoverageAnalysis]: Checked inductivity of 3502 backedges. 1190 proven. 2312 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:23:33,301 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:23:33,860 INFO L134 CoverageAnalysis]: Checked inductivity of 3502 backedges. 1190 proven. 2312 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:23:33,861 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [905418992] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:23:33,861 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1107754258] [2021-11-03 04:23:33,862 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-03 04:23:33,863 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:23:33,863 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:23:33,863 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:23:33,863 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:23:33,865 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:33,866 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:23:33,866 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:33,866 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 04:23:33,867 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:23:33,867 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:33,867 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 04:23:33,868 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-03 04:23:33,869 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_45|], 10=[|v_#valid_46|]} [2021-11-03 04:23:33,873 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:23:33,874 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-03 04:23:33,874 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:33,875 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:23:33,875 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:33,875 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:23:33,875 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 04:23:33,875 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:33,877 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:33,879 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:23:33,880 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:23:33,880 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:23:33,883 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:23:33,884 INFO L388 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 23 treesize of output 22 [2021-11-03 04:23:33,884 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:33,885 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:23:33,885 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:33,886 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:23:33,886 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 04:23:33,886 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:33,887 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:33,888 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:33,888 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:23:33,889 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 04:23:33,889 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-03 04:23:33,892 INFO L180 QuantifierPusher]: treesize reduction 13, result has 87.3 percent of original size [2021-11-03 04:23:33,894 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:23:33,895 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:33,897 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:23:33,897 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:33,898 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:23:33,899 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 88 [2021-11-03 04:23:33,900 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.4 percent of original size [2021-11-03 04:23:33,903 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 91 [2021-11-03 04:23:33,904 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:33,916 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:33,917 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:33,918 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:33,918 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:33,919 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:33,921 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:33,929 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:33,932 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 97 [2021-11-03 04:23:33,935 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:33,939 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:33,940 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:33,940 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:33,940 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:33,941 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:33,942 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:33,944 INFO L180 QuantifierPusher]: treesize reduction 24, result has 72.4 percent of original size [2021-11-03 04:23:33,946 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 42 [2021-11-03 04:23:33,949 INFO L180 QuantifierPusher]: treesize reduction 24, result has 68.0 percent of original size [2021-11-03 04:23:33,950 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:23:33,950 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:33,951 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 04:23:33,952 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 34 [2021-11-03 04:23:33,954 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:33,955 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 75 [2021-11-03 04:23:33,956 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:33,959 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:33,961 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:33,966 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:33,973 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 132 [2021-11-03 04:23:33,975 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:33,978 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 152 [2021-11-03 04:23:33,981 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:33,992 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:33,993 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:33,993 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:33,994 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:33,995 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:33,995 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:33,998 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:34,002 INFO L180 QuantifierPusher]: treesize reduction 24, result has 77.1 percent of original size [2021-11-03 04:23:34,004 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-03 04:23:34,006 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:34,011 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:34,012 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:34,013 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:34,014 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:34,015 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:34,019 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:23:34,021 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:23:34,027 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:23:34,029 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:23:34,031 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 04:23:35,077 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 04:23:35,077 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:23:35,077 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [72, 37, 37] total 108 [2021-11-03 04:23:35,077 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [793016860] [2021-11-03 04:23:35,078 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 108 states [2021-11-03 04:23:35,078 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:23:35,079 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 108 interpolants. [2021-11-03 04:23:35,079 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2067, Invalid=11505, Unknown=0, NotChecked=0, Total=13572 [2021-11-03 04:23:35,080 INFO L87 Difference]: Start difference. First operand 215 states and 217 transitions. Second operand has 108 states, 108 states have (on average 3.9537037037037037) internal successors, (427), 108 states have internal predecessors, (427), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:23:39,284 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:23:39,284 INFO L93 Difference]: Finished difference Result 472 states and 511 transitions. [2021-11-03 04:23:39,285 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 145 states. [2021-11-03 04:23:39,285 INFO L78 Accepts]: Start accepts. Automaton has has 108 states, 108 states have (on average 3.9537037037037037) internal successors, (427), 108 states have internal predecessors, (427), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 214 [2021-11-03 04:23:39,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:23:39,287 INFO L225 Difference]: With dead ends: 472 [2021-11-03 04:23:39,287 INFO L226 Difference]: Without dead ends: 329 [2021-11-03 04:23:39,294 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 887 GetRequests, 631 SyntacticMatches, 1 SemanticMatches, 255 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22590 ImplicationChecksByTransitivity, 6.6s TimeCoverageRelationStatistics Valid=9980, Invalid=55812, Unknown=0, NotChecked=0, Total=65792 [2021-11-03 04:23:39,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 329 states. [2021-11-03 04:23:39,315 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 329 to 221. [2021-11-03 04:23:39,316 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 221 states, 220 states have (on average 1.0136363636363637) internal successors, (223), 220 states have internal predecessors, (223), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:23:39,317 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 221 states to 221 states and 223 transitions. [2021-11-03 04:23:39,317 INFO L78 Accepts]: Start accepts. Automaton has 221 states and 223 transitions. Word has length 214 [2021-11-03 04:23:39,317 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:23:39,317 INFO L470 AbstractCegarLoop]: Abstraction has 221 states and 223 transitions. [2021-11-03 04:23:39,318 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 108 states, 108 states have (on average 3.9537037037037037) internal successors, (427), 108 states have internal predecessors, (427), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:23:39,318 INFO L276 IsEmpty]: Start isEmpty. Operand 221 states and 223 transitions. [2021-11-03 04:23:39,319 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 221 [2021-11-03 04:23:39,319 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:23:39,319 INFO L513 BasicCegarLoop]: trace histogram [36, 36, 35, 35, 35, 35, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:23:39,356 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Forceful destruction successful, exit code 0 [2021-11-03 04:23:39,535 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1093,39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:23:39,535 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:23:39,535 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:23:39,535 INFO L85 PathProgramCache]: Analyzing trace with hash 1440636088, now seen corresponding path program 39 times [2021-11-03 04:23:39,536 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:23:39,536 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1800782338] [2021-11-03 04:23:39,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:23:39,536 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:23:39,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:23:41,203 INFO L134 CoverageAnalysis]: Checked inductivity of 3710 backedges. 2348 proven. 1362 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:23:41,204 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:23:41,204 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1800782338] [2021-11-03 04:23:41,204 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1800782338] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:23:41,204 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [995756958] [2021-11-03 04:23:41,204 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-03 04:23:41,205 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:23:41,205 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:23:41,205 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:23:41,207 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2021-11-03 04:23:44,229 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-03 04:23:44,229 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 04:23:44,233 INFO L263 TraceCheckSpWp]: Trace formula consists of 821 conjuncts, 74 conjunts are in the unsatisfiable core [2021-11-03 04:23:44,236 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:23:46,164 INFO L134 CoverageAnalysis]: Checked inductivity of 3710 backedges. 1260 proven. 2450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:23:46,164 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:23:46,777 INFO L134 CoverageAnalysis]: Checked inductivity of 3710 backedges. 1260 proven. 2450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:23:46,777 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [995756958] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:23:46,778 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [416958206] [2021-11-03 04:23:46,778 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-03 04:23:46,778 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:23:46,779 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:23:46,779 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:23:46,779 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:23:46,804 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:46,805 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:23:46,806 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:46,806 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 04:23:46,807 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:23:46,807 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:46,807 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 04:23:46,808 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-03 04:23:46,810 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_46|], 10=[|v_#valid_47|]} [2021-11-03 04:23:46,815 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:23:46,816 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-03 04:23:46,817 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:46,817 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:23:46,818 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:46,818 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:23:46,818 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 04:23:46,819 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:46,820 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:46,823 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:23:46,824 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:23:46,824 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:23:46,827 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:23:46,828 INFO L388 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 23 treesize of output 22 [2021-11-03 04:23:46,828 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:46,829 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:23:46,829 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:46,830 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:23:46,830 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 04:23:46,830 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:46,831 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:46,832 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:46,832 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:23:46,833 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 04:23:46,833 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-03 04:23:46,836 INFO L180 QuantifierPusher]: treesize reduction 13, result has 87.3 percent of original size [2021-11-03 04:23:46,837 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:23:46,839 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:46,840 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:23:46,841 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:46,842 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:23:46,843 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 88 [2021-11-03 04:23:46,844 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.4 percent of original size [2021-11-03 04:23:46,846 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 04:23:46,848 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:46,851 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:46,852 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:46,853 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:46,853 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:46,854 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:46,855 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:46,858 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:46,867 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 96 [2021-11-03 04:23:46,869 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:46,876 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:46,877 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:46,877 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:46,878 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:46,878 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:46,880 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:46,883 INFO L180 QuantifierPusher]: treesize reduction 24, result has 72.4 percent of original size [2021-11-03 04:23:46,886 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 42 [2021-11-03 04:23:46,890 INFO L180 QuantifierPusher]: treesize reduction 24, result has 68.0 percent of original size [2021-11-03 04:23:46,892 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:23:46,892 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:46,894 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 04:23:46,894 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 34 [2021-11-03 04:23:46,896 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:46,898 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-03 04:23:46,900 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:46,904 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:46,907 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:46,914 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:46,916 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 121 [2021-11-03 04:23:46,919 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:23:46,921 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 141 [2021-11-03 04:23:46,924 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:46,934 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:46,934 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:46,935 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:46,936 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:46,936 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:46,937 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:46,939 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:46,943 INFO L180 QuantifierPusher]: treesize reduction 24, result has 77.1 percent of original size [2021-11-03 04:23:46,945 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-03 04:23:46,947 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:46,951 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:46,952 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:46,953 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:46,953 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:46,955 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:23:46,958 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:23:46,960 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:23:46,966 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:23:46,969 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:23:46,970 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 04:23:48,009 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 04:23:48,009 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:23:48,010 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [74, 38, 38] total 111 [2021-11-03 04:23:48,010 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1143647592] [2021-11-03 04:23:48,010 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 111 states [2021-11-03 04:23:48,010 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:23:48,011 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 111 interpolants. [2021-11-03 04:23:48,011 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2179, Invalid=12101, Unknown=0, NotChecked=0, Total=14280 [2021-11-03 04:23:48,012 INFO L87 Difference]: Start difference. First operand 221 states and 223 transitions. Second operand has 111 states, 111 states have (on average 3.954954954954955) internal successors, (439), 111 states have internal predecessors, (439), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:23:52,358 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:23:52,358 INFO L93 Difference]: Finished difference Result 485 states and 525 transitions. [2021-11-03 04:23:52,358 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 149 states. [2021-11-03 04:23:52,358 INFO L78 Accepts]: Start accepts. Automaton has has 111 states, 111 states have (on average 3.954954954954955) internal successors, (439), 111 states have internal predecessors, (439), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 220 [2021-11-03 04:23:52,359 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:23:52,360 INFO L225 Difference]: With dead ends: 485 [2021-11-03 04:23:52,360 INFO L226 Difference]: Without dead ends: 338 [2021-11-03 04:23:52,364 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 912 GetRequests, 649 SyntacticMatches, 1 SemanticMatches, 262 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23866 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=10534, Invalid=58898, Unknown=0, NotChecked=0, Total=69432 [2021-11-03 04:23:52,365 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 338 states. [2021-11-03 04:23:52,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 338 to 227. [2021-11-03 04:23:52,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 227 states, 226 states have (on average 1.0132743362831858) internal successors, (229), 226 states have internal predecessors, (229), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:23:52,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 227 states to 227 states and 229 transitions. [2021-11-03 04:23:52,389 INFO L78 Accepts]: Start accepts. Automaton has 227 states and 229 transitions. Word has length 220 [2021-11-03 04:23:52,389 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:23:52,389 INFO L470 AbstractCegarLoop]: Abstraction has 227 states and 229 transitions. [2021-11-03 04:23:52,389 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 111 states, 111 states have (on average 3.954954954954955) internal successors, (439), 111 states have internal predecessors, (439), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:23:52,389 INFO L276 IsEmpty]: Start isEmpty. Operand 227 states and 229 transitions. [2021-11-03 04:23:52,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 227 [2021-11-03 04:23:52,390 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:23:52,390 INFO L513 BasicCegarLoop]: trace histogram [37, 37, 36, 36, 36, 36, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:23:52,420 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Forceful destruction successful, exit code 0 [2021-11-03 04:23:52,590 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1127,40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:23:52,591 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:23:52,591 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:23:52,591 INFO L85 PathProgramCache]: Analyzing trace with hash 297901008, now seen corresponding path program 40 times [2021-11-03 04:23:52,591 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:23:52,591 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1836445235] [2021-11-03 04:23:52,591 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:23:52,592 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:23:52,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:23:54,421 INFO L134 CoverageAnalysis]: Checked inductivity of 3924 backedges. 2487 proven. 1437 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:23:54,421 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:23:54,422 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1836445235] [2021-11-03 04:23:54,422 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1836445235] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:23:54,422 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1631086767] [2021-11-03 04:23:54,422 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-03 04:23:54,422 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:23:54,422 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:23:54,423 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:23:54,423 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2021-11-03 04:23:57,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:23:57,544 INFO L263 TraceCheckSpWp]: Trace formula consists of 843 conjuncts, 76 conjunts are in the unsatisfiable core [2021-11-03 04:23:57,547 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:24:00,218 INFO L134 CoverageAnalysis]: Checked inductivity of 3924 backedges. 2592 proven. 1332 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:24:00,218 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:24:00,835 INFO L134 CoverageAnalysis]: Checked inductivity of 3924 backedges. 2592 proven. 1332 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:24:00,836 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1631086767] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:24:00,836 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1578081002] [2021-11-03 04:24:00,837 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-03 04:24:00,837 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:24:00,837 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:24:00,837 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:24:00,838 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:24:00,842 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:00,842 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:24:00,843 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:00,843 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 04:24:00,843 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:24:00,844 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:00,844 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 04:24:00,844 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-03 04:24:00,846 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_47|], 10=[|v_#valid_48|]} [2021-11-03 04:24:00,850 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:24:00,850 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-03 04:24:00,850 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:00,851 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:24:00,851 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:00,851 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:24:00,851 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 04:24:00,852 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:00,853 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:00,855 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:24:00,858 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:24:00,859 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:24:00,861 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:24:00,862 INFO L388 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 23 treesize of output 22 [2021-11-03 04:24:00,862 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:00,863 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:24:00,864 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:00,864 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:24:00,864 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 04:24:00,864 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:00,866 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:00,866 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:00,867 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:24:00,867 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 04:24:00,867 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-03 04:24:00,870 INFO L180 QuantifierPusher]: treesize reduction 13, result has 87.3 percent of original size [2021-11-03 04:24:00,871 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:24:00,873 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:00,874 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:24:00,875 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:00,876 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:24:00,876 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 88 [2021-11-03 04:24:00,878 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.4 percent of original size [2021-11-03 04:24:00,880 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 91 [2021-11-03 04:24:00,882 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:00,885 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:00,886 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:00,886 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:00,887 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:00,887 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:00,888 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:00,892 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:00,895 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 101 [2021-11-03 04:24:00,896 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:00,901 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:00,901 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:00,902 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:00,902 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:00,903 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:00,903 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:00,906 INFO L180 QuantifierPusher]: treesize reduction 24, result has 72.4 percent of original size [2021-11-03 04:24:00,907 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 42 [2021-11-03 04:24:00,910 INFO L180 QuantifierPusher]: treesize reduction 24, result has 68.0 percent of original size [2021-11-03 04:24:00,911 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:24:00,912 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:00,913 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 04:24:00,913 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 34 [2021-11-03 04:24:00,915 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:00,916 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 73 [2021-11-03 04:24:00,917 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:00,920 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:00,922 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:00,926 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:00,928 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 132 [2021-11-03 04:24:00,929 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:00,931 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 152 [2021-11-03 04:24:00,933 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:00,940 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:00,940 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:00,941 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:00,941 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:00,942 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:00,942 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:00,944 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:00,946 INFO L180 QuantifierPusher]: treesize reduction 24, result has 77.1 percent of original size [2021-11-03 04:24:00,948 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-03 04:24:00,949 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:00,952 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:00,953 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:00,953 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:00,953 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:00,954 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:00,968 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:24:00,970 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:24:00,976 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:24:00,978 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:24:00,980 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 04:24:02,027 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 04:24:02,028 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:24:02,028 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [76, 76, 76] total 115 [2021-11-03 04:24:02,028 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1979447621] [2021-11-03 04:24:02,029 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 115 states [2021-11-03 04:24:02,029 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:24:02,030 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 115 interpolants. [2021-11-03 04:24:02,031 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3069, Invalid=12183, Unknown=0, NotChecked=0, Total=15252 [2021-11-03 04:24:02,032 INFO L87 Difference]: Start difference. First operand 227 states and 229 transitions. Second operand has 115 states, 115 states have (on average 3.2869565217391306) internal successors, (378), 115 states have internal predecessors, (378), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:24:03,530 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:24:03,530 INFO L93 Difference]: Finished difference Result 491 states and 531 transitions. [2021-11-03 04:24:03,530 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2021-11-03 04:24:03,530 INFO L78 Accepts]: Start accepts. Automaton has has 115 states, 115 states have (on average 3.2869565217391306) internal successors, (378), 115 states have internal predecessors, (378), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 226 [2021-11-03 04:24:03,530 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:24:03,532 INFO L225 Difference]: With dead ends: 491 [2021-11-03 04:24:03,532 INFO L226 Difference]: Without dead ends: 340 [2021-11-03 04:24:03,533 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 789 GetRequests, 630 SyntacticMatches, 0 SemanticMatches, 159 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6370 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=5883, Invalid=19877, Unknown=0, NotChecked=0, Total=25760 [2021-11-03 04:24:03,533 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 340 states. [2021-11-03 04:24:03,549 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 340 to 229. [2021-11-03 04:24:03,549 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 229 states, 228 states have (on average 1.013157894736842) internal successors, (231), 228 states have internal predecessors, (231), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:24:03,550 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 229 states to 229 states and 231 transitions. [2021-11-03 04:24:03,550 INFO L78 Accepts]: Start accepts. Automaton has 229 states and 231 transitions. Word has length 226 [2021-11-03 04:24:03,550 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:24:03,550 INFO L470 AbstractCegarLoop]: Abstraction has 229 states and 231 transitions. [2021-11-03 04:24:03,550 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 115 states, 115 states have (on average 3.2869565217391306) internal successors, (378), 115 states have internal predecessors, (378), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:24:03,550 INFO L276 IsEmpty]: Start isEmpty. Operand 229 states and 231 transitions. [2021-11-03 04:24:03,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 229 [2021-11-03 04:24:03,552 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:24:03,552 INFO L513 BasicCegarLoop]: trace histogram [38, 37, 37, 36, 36, 36, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:24:03,581 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Forceful destruction successful, exit code 0 [2021-11-03 04:24:03,752 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1161,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:24:03,753 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:24:03,753 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:24:03,753 INFO L85 PathProgramCache]: Analyzing trace with hash 1341390837, now seen corresponding path program 41 times [2021-11-03 04:24:03,753 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:24:03,753 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [445491344] [2021-11-03 04:24:03,753 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:24:03,753 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:24:03,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:24:04,482 INFO L134 CoverageAnalysis]: Checked inductivity of 3998 backedges. 1332 proven. 2666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:24:04,482 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:24:04,482 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [445491344] [2021-11-03 04:24:04,483 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [445491344] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:24:04,483 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1359237781] [2021-11-03 04:24:04,483 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-03 04:24:04,483 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:24:04,483 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:24:04,484 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:24:04,485 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2021-11-03 04:24:07,882 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 38 check-sat command(s) [2021-11-03 04:24:07,882 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 04:24:07,887 INFO L263 TraceCheckSpWp]: Trace formula consists of 853 conjuncts, 77 conjunts are in the unsatisfiable core [2021-11-03 04:24:07,889 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:24:08,519 INFO L134 CoverageAnalysis]: Checked inductivity of 3998 backedges. 1406 proven. 2592 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:24:08,519 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:24:09,129 INFO L134 CoverageAnalysis]: Checked inductivity of 3998 backedges. 1406 proven. 2592 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:24:09,129 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1359237781] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:24:09,130 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1769909203] [2021-11-03 04:24:09,131 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-03 04:24:09,131 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:24:09,131 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:24:09,131 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:24:09,132 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:24:09,134 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:09,135 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:24:09,135 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:09,136 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 04:24:09,136 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:24:09,137 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:09,137 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 04:24:09,138 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-03 04:24:09,140 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_48|], 10=[|v_#valid_49|]} [2021-11-03 04:24:09,146 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:24:09,147 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-03 04:24:09,147 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:09,148 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:24:09,148 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:09,148 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:24:09,149 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 04:24:09,149 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:09,151 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:09,154 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:24:09,155 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:24:09,156 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:24:09,159 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:24:09,160 INFO L388 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 23 treesize of output 22 [2021-11-03 04:24:09,161 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:09,162 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:24:09,163 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:09,163 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:24:09,163 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 04:24:09,164 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:09,166 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:09,166 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:09,167 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:24:09,168 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 04:24:09,168 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-03 04:24:09,172 INFO L180 QuantifierPusher]: treesize reduction 13, result has 87.3 percent of original size [2021-11-03 04:24:09,174 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:24:09,176 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:09,178 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:24:09,179 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:09,180 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:24:09,181 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 88 [2021-11-03 04:24:09,184 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.4 percent of original size [2021-11-03 04:24:09,187 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 04:24:09,189 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:09,194 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:09,195 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:09,195 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:09,196 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:09,197 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:09,199 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:09,203 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:09,207 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-03 04:24:09,209 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:09,215 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:09,216 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:09,217 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:09,217 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:09,218 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:09,219 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:09,222 INFO L180 QuantifierPusher]: treesize reduction 24, result has 72.4 percent of original size [2021-11-03 04:24:09,225 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 42 [2021-11-03 04:24:09,229 INFO L180 QuantifierPusher]: treesize reduction 24, result has 68.0 percent of original size [2021-11-03 04:24:09,230 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:24:09,230 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:09,232 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 04:24:09,232 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 34 [2021-11-03 04:24:09,235 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:09,237 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 73 [2021-11-03 04:24:09,239 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:09,242 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:09,245 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:09,252 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:09,254 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 121 [2021-11-03 04:24:09,257 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:09,259 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 141 [2021-11-03 04:24:09,262 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:09,270 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:09,270 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:09,271 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:09,271 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:09,272 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:09,272 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:09,273 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:09,276 INFO L180 QuantifierPusher]: treesize reduction 24, result has 77.1 percent of original size [2021-11-03 04:24:09,277 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-03 04:24:09,279 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:09,282 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:09,282 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:09,283 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:09,283 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:09,285 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:09,288 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:24:09,289 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:24:09,294 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:24:09,295 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:24:09,296 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 04:24:09,992 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 04:24:09,992 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:24:09,992 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 43 [2021-11-03 04:24:09,992 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1067083139] [2021-11-03 04:24:09,993 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2021-11-03 04:24:09,993 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:24:09,993 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-11-03 04:24:09,994 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=875, Invalid=1881, Unknown=0, NotChecked=0, Total=2756 [2021-11-03 04:24:09,994 INFO L87 Difference]: Start difference. First operand 229 states and 231 transitions. Second operand has 44 states, 44 states have (on average 5.659090909090909) internal successors, (249), 43 states have internal predecessors, (249), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:24:10,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:24:10,755 INFO L93 Difference]: Finished difference Result 246 states and 249 transitions. [2021-11-03 04:24:10,755 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2021-11-03 04:24:10,755 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 5.659090909090909) internal successors, (249), 43 states have internal predecessors, (249), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 228 [2021-11-03 04:24:10,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:24:10,757 INFO L225 Difference]: With dead ends: 246 [2021-11-03 04:24:10,757 INFO L226 Difference]: Without dead ends: 244 [2021-11-03 04:24:10,757 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 798 GetRequests, 706 SyntacticMatches, 1 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2395 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=2600, Invalid=5956, Unknown=0, NotChecked=0, Total=8556 [2021-11-03 04:24:10,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 244 states. [2021-11-03 04:24:10,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 244 to 237. [2021-11-03 04:24:10,781 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 237 states, 236 states have (on average 1.0127118644067796) internal successors, (239), 236 states have internal predecessors, (239), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:24:10,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 237 states to 237 states and 239 transitions. [2021-11-03 04:24:10,782 INFO L78 Accepts]: Start accepts. Automaton has 237 states and 239 transitions. Word has length 228 [2021-11-03 04:24:10,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:24:10,782 INFO L470 AbstractCegarLoop]: Abstraction has 237 states and 239 transitions. [2021-11-03 04:24:10,783 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 5.659090909090909) internal successors, (249), 43 states have internal predecessors, (249), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:24:10,783 INFO L276 IsEmpty]: Start isEmpty. Operand 237 states and 239 transitions. [2021-11-03 04:24:10,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 237 [2021-11-03 04:24:10,784 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:24:10,784 INFO L513 BasicCegarLoop]: trace histogram [39, 38, 38, 38, 38, 37, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:24:10,820 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Forceful destruction successful, exit code 0 [2021-11-03 04:24:10,999 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1195,42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:24:11,000 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:24:11,000 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:24:11,000 INFO L85 PathProgramCache]: Analyzing trace with hash 1724878043, now seen corresponding path program 42 times [2021-11-03 04:24:11,000 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:24:11,000 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1465777201] [2021-11-03 04:24:11,000 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:24:11,000 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:24:11,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:24:12,991 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 2777 proven. 1517 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:24:12,992 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:24:12,992 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1465777201] [2021-11-03 04:24:12,992 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1465777201] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:24:12,992 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1175808480] [2021-11-03 04:24:12,992 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-03 04:24:12,992 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:24:12,992 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:24:12,993 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:24:12,994 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2021-11-03 04:24:16,479 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-03 04:24:16,479 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 04:24:16,484 INFO L263 TraceCheckSpWp]: Trace formula consists of 877 conjuncts, 79 conjunts are in the unsatisfiable core [2021-11-03 04:24:16,487 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:24:19,459 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 2888 proven. 1406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:24:19,459 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:24:20,122 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 2888 proven. 1406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:24:20,122 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1175808480] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:24:20,122 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1302476914] [2021-11-03 04:24:20,123 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-03 04:24:20,123 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:24:20,123 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:24:20,124 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:24:20,124 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:24:20,133 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:20,133 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:24:20,133 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:20,134 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 04:24:20,134 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:24:20,134 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:20,134 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 04:24:20,135 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-03 04:24:20,136 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_49|], 10=[|v_#valid_50|]} [2021-11-03 04:24:20,140 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:24:20,141 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-03 04:24:20,141 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:20,142 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:24:20,142 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:20,142 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:24:20,142 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 04:24:20,142 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:20,144 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:20,146 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:24:20,147 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:24:20,147 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:24:20,150 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:24:20,151 INFO L388 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 23 treesize of output 22 [2021-11-03 04:24:20,151 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:20,152 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:24:20,152 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:20,153 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:24:20,153 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 04:24:20,153 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:20,154 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:20,155 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:20,155 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:24:20,156 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 04:24:20,156 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-03 04:24:20,159 INFO L180 QuantifierPusher]: treesize reduction 13, result has 87.3 percent of original size [2021-11-03 04:24:20,160 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:24:20,162 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:20,163 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:24:20,164 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:20,165 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:24:20,165 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 88 [2021-11-03 04:24:20,167 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.4 percent of original size [2021-11-03 04:24:20,169 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 04:24:20,171 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:20,174 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:20,175 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:20,175 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:20,176 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:20,177 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:20,178 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:20,181 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:20,184 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-03 04:24:20,185 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:20,189 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:20,190 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:20,190 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:20,191 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:20,191 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:20,192 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:20,194 INFO L180 QuantifierPusher]: treesize reduction 24, result has 72.4 percent of original size [2021-11-03 04:24:20,196 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 42 [2021-11-03 04:24:20,199 INFO L180 QuantifierPusher]: treesize reduction 24, result has 68.0 percent of original size [2021-11-03 04:24:20,200 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:24:20,200 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:20,201 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 04:24:20,202 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 34 [2021-11-03 04:24:20,203 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:20,205 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 75 [2021-11-03 04:24:20,206 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:20,208 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:20,211 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:20,215 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:20,217 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 132 [2021-11-03 04:24:20,218 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:20,220 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 152 [2021-11-03 04:24:20,222 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:20,228 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:20,229 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:20,229 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:20,230 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:20,230 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:20,231 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:20,233 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:20,236 INFO L180 QuantifierPusher]: treesize reduction 24, result has 77.1 percent of original size [2021-11-03 04:24:20,238 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-03 04:24:20,239 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:20,250 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:20,251 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:20,252 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:20,252 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:20,254 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:20,257 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:24:20,259 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:24:20,263 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:24:20,265 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:24:20,266 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 04:24:21,395 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 04:24:21,395 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:24:21,396 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [79, 79, 79] total 122 [2021-11-03 04:24:21,396 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1107963941] [2021-11-03 04:24:21,397 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 122 states [2021-11-03 04:24:21,397 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:24:21,398 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 122 interpolants. [2021-11-03 04:24:21,399 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3470, Invalid=13560, Unknown=0, NotChecked=0, Total=17030 [2021-11-03 04:24:21,400 INFO L87 Difference]: Start difference. First operand 237 states and 239 transitions. Second operand has 122 states, 122 states have (on average 3.319672131147541) internal successors, (405), 122 states have internal predecessors, (405), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:24:24,073 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:24:24,073 INFO L93 Difference]: Finished difference Result 668 states and 711 transitions. [2021-11-03 04:24:24,073 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 118 states. [2021-11-03 04:24:24,073 INFO L78 Accepts]: Start accepts. Automaton has has 122 states, 122 states have (on average 3.319672131147541) internal successors, (405), 122 states have internal predecessors, (405), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 236 [2021-11-03 04:24:24,074 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:24:24,075 INFO L225 Difference]: With dead ends: 668 [2021-11-03 04:24:24,075 INFO L226 Difference]: Without dead ends: 358 [2021-11-03 04:24:24,077 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 862 GetRequests, 656 SyntacticMatches, 0 SemanticMatches, 206 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11150 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=9670, Invalid=33386, Unknown=0, NotChecked=0, Total=43056 [2021-11-03 04:24:24,078 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 358 states. [2021-11-03 04:24:24,104 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 358 to 241. [2021-11-03 04:24:24,105 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 241 states, 240 states have (on average 1.0125) internal successors, (243), 240 states have internal predecessors, (243), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:24:24,106 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 241 states to 241 states and 243 transitions. [2021-11-03 04:24:24,106 INFO L78 Accepts]: Start accepts. Automaton has 241 states and 243 transitions. Word has length 236 [2021-11-03 04:24:24,106 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:24:24,106 INFO L470 AbstractCegarLoop]: Abstraction has 241 states and 243 transitions. [2021-11-03 04:24:24,107 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 122 states, 122 states have (on average 3.319672131147541) internal successors, (405), 122 states have internal predecessors, (405), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:24:24,107 INFO L276 IsEmpty]: Start isEmpty. Operand 241 states and 243 transitions. [2021-11-03 04:24:24,108 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 241 [2021-11-03 04:24:24,108 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:24:24,108 INFO L513 BasicCegarLoop]: trace histogram [40, 39, 39, 38, 38, 38, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:24:24,161 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Forceful destruction successful, exit code 0 [2021-11-03 04:24:24,331 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1229,43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:24:24,332 INFO L402 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:24:24,332 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:24:24,332 INFO L85 PathProgramCache]: Analyzing trace with hash 336534373, now seen corresponding path program 43 times [2021-11-03 04:24:24,332 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:24:24,332 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [127170553] [2021-11-03 04:24:24,332 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:24:24,332 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:24:24,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:24:25,114 INFO L134 CoverageAnalysis]: Checked inductivity of 4448 backedges. 1482 proven. 2966 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:24:25,114 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:24:25,114 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [127170553] [2021-11-03 04:24:25,115 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [127170553] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:24:25,115 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [497071019] [2021-11-03 04:24:25,115 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-03 04:24:25,115 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:24:25,115 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:24:25,116 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:24:25,117 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2021-11-03 04:24:28,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:24:28,766 INFO L263 TraceCheckSpWp]: Trace formula consists of 897 conjuncts, 81 conjunts are in the unsatisfiable core [2021-11-03 04:24:28,770 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:24:29,422 INFO L134 CoverageAnalysis]: Checked inductivity of 4448 backedges. 1560 proven. 2888 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:24:29,422 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:24:30,084 INFO L134 CoverageAnalysis]: Checked inductivity of 4448 backedges. 1560 proven. 2888 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:24:30,084 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [497071019] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:24:30,084 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [406764945] [2021-11-03 04:24:30,086 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-03 04:24:30,086 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:24:30,087 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:24:30,087 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:24:30,087 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:24:30,089 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:30,089 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:24:30,089 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:30,090 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 04:24:30,090 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:24:30,090 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:30,090 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 04:24:30,091 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-03 04:24:30,092 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_50|], 10=[|v_#valid_51|]} [2021-11-03 04:24:30,098 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:24:30,099 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-03 04:24:30,099 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:30,100 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:24:30,100 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:30,100 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:24:30,100 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 04:24:30,101 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:30,102 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:30,105 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:24:30,106 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:24:30,107 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:24:30,109 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:24:30,115 INFO L388 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 23 treesize of output 22 [2021-11-03 04:24:30,115 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:30,116 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:24:30,117 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:30,117 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:24:30,117 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 04:24:30,119 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:30,120 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:30,120 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:30,121 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:24:30,121 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 04:24:30,121 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-03 04:24:30,125 INFO L180 QuantifierPusher]: treesize reduction 13, result has 87.3 percent of original size [2021-11-03 04:24:30,126 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:24:30,128 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:30,131 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:24:30,131 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:30,133 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:24:30,135 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 88 [2021-11-03 04:24:30,137 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.4 percent of original size [2021-11-03 04:24:30,139 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 97 [2021-11-03 04:24:30,141 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:30,144 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:30,145 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:30,146 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:30,146 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:30,146 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:30,148 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:30,150 INFO L180 QuantifierPusher]: treesize reduction 24, result has 72.4 percent of original size [2021-11-03 04:24:30,152 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 42 [2021-11-03 04:24:30,155 INFO L180 QuantifierPusher]: treesize reduction 24, result has 68.0 percent of original size [2021-11-03 04:24:30,156 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:24:30,156 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:30,157 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 04:24:30,158 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 34 [2021-11-03 04:24:30,159 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:30,161 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 75 [2021-11-03 04:24:30,162 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:30,165 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:30,169 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:30,173 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:30,175 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 132 [2021-11-03 04:24:30,177 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:30,178 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 152 [2021-11-03 04:24:30,181 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:30,187 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:30,188 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:30,188 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:30,189 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:30,189 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:30,189 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:30,191 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:30,194 INFO L180 QuantifierPusher]: treesize reduction 24, result has 77.1 percent of original size [2021-11-03 04:24:30,195 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-03 04:24:30,196 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:30,199 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:30,200 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:30,200 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:30,201 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:30,202 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:30,204 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:24:30,206 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:24:30,210 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:24:30,212 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:24:30,213 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 04:24:30,921 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 04:24:30,921 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:24:30,921 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42, 42] total 45 [2021-11-03 04:24:30,922 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1705046797] [2021-11-03 04:24:30,922 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2021-11-03 04:24:30,922 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:24:30,922 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-11-03 04:24:30,923 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=958, Invalid=2012, Unknown=0, NotChecked=0, Total=2970 [2021-11-03 04:24:30,923 INFO L87 Difference]: Start difference. First operand 241 states and 243 transitions. Second operand has 46 states, 46 states have (on average 5.673913043478261) internal successors, (261), 45 states have internal predecessors, (261), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:24:31,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:24:31,755 INFO L93 Difference]: Finished difference Result 258 states and 261 transitions. [2021-11-03 04:24:31,755 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2021-11-03 04:24:31,755 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 5.673913043478261) internal successors, (261), 45 states have internal predecessors, (261), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 240 [2021-11-03 04:24:31,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:24:31,757 INFO L225 Difference]: With dead ends: 258 [2021-11-03 04:24:31,757 INFO L226 Difference]: Without dead ends: 256 [2021-11-03 04:24:31,758 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 840 GetRequests, 744 SyntacticMatches, 1 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2599 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=2853, Invalid=6459, Unknown=0, NotChecked=0, Total=9312 [2021-11-03 04:24:31,759 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 256 states. [2021-11-03 04:24:31,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 256 to 249. [2021-11-03 04:24:31,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 249 states, 248 states have (on average 1.0120967741935485) internal successors, (251), 248 states have internal predecessors, (251), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:24:31,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 249 states to 249 states and 251 transitions. [2021-11-03 04:24:31,781 INFO L78 Accepts]: Start accepts. Automaton has 249 states and 251 transitions. Word has length 240 [2021-11-03 04:24:31,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:24:31,782 INFO L470 AbstractCegarLoop]: Abstraction has 249 states and 251 transitions. [2021-11-03 04:24:31,782 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 5.673913043478261) internal successors, (261), 45 states have internal predecessors, (261), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:24:31,782 INFO L276 IsEmpty]: Start isEmpty. Operand 249 states and 251 transitions. [2021-11-03 04:24:31,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 249 [2021-11-03 04:24:31,784 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:24:31,784 INFO L513 BasicCegarLoop]: trace histogram [41, 40, 40, 40, 40, 39, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:24:31,832 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Forceful destruction successful, exit code 0 [2021-11-03 04:24:32,007 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1263,44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:24:32,008 INFO L402 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:24:32,008 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:24:32,008 INFO L85 PathProgramCache]: Analyzing trace with hash -175097781, now seen corresponding path program 44 times [2021-11-03 04:24:32,008 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:24:32,008 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1029983345] [2021-11-03 04:24:32,008 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:24:32,008 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:24:32,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:24:34,005 INFO L134 CoverageAnalysis]: Checked inductivity of 4760 backedges. 3083 proven. 1677 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:24:34,005 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:24:34,006 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1029983345] [2021-11-03 04:24:34,006 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1029983345] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:24:34,006 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1667643313] [2021-11-03 04:24:34,006 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-03 04:24:34,006 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:24:34,006 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:24:34,007 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:24:34,008 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2021-11-03 04:24:37,960 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 41 check-sat command(s) [2021-11-03 04:24:37,960 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 04:24:37,965 INFO L263 TraceCheckSpWp]: Trace formula consists of 921 conjuncts, 83 conjunts are in the unsatisfiable core [2021-11-03 04:24:37,969 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:24:41,139 INFO L134 CoverageAnalysis]: Checked inductivity of 4760 backedges. 3200 proven. 1560 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:24:41,139 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:24:41,861 INFO L134 CoverageAnalysis]: Checked inductivity of 4760 backedges. 3200 proven. 1560 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:24:41,861 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1667643313] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:24:41,861 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1113158863] [2021-11-03 04:24:41,862 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-03 04:24:41,862 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:24:41,862 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:24:41,863 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:24:41,863 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:24:41,866 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:41,866 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:24:41,866 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:41,867 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 04:24:41,867 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:24:41,867 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:41,867 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 04:24:41,868 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-03 04:24:41,876 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_51|], 10=[|v_#valid_52|]} [2021-11-03 04:24:41,880 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:24:41,881 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-03 04:24:41,881 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:41,881 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:24:41,882 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:41,882 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:24:41,882 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 04:24:41,882 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:41,883 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:41,886 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:24:41,886 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:24:41,887 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:24:41,890 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:24:41,890 INFO L388 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 23 treesize of output 22 [2021-11-03 04:24:41,891 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:41,892 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:24:41,892 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:41,893 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:24:41,893 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 04:24:41,893 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:41,894 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:41,895 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:41,895 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:24:41,896 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 04:24:41,896 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-03 04:24:41,899 INFO L180 QuantifierPusher]: treesize reduction 13, result has 87.3 percent of original size [2021-11-03 04:24:41,900 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:24:41,902 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:41,903 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:24:41,904 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:41,905 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:24:41,905 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 88 [2021-11-03 04:24:41,907 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.4 percent of original size [2021-11-03 04:24:41,909 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 95 [2021-11-03 04:24:41,911 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:41,914 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:41,915 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:41,915 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:41,916 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:41,916 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:41,917 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:41,919 INFO L180 QuantifierPusher]: treesize reduction 24, result has 72.4 percent of original size [2021-11-03 04:24:41,921 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 42 [2021-11-03 04:24:41,924 INFO L180 QuantifierPusher]: treesize reduction 24, result has 68.0 percent of original size [2021-11-03 04:24:41,925 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:24:41,925 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:41,926 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 04:24:41,927 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 34 [2021-11-03 04:24:41,928 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:41,930 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 75 [2021-11-03 04:24:41,931 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:41,934 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:41,937 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:41,942 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:41,943 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 132 [2021-11-03 04:24:41,945 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:41,947 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 152 [2021-11-03 04:24:41,949 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:41,955 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:41,956 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:41,956 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:41,957 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:41,957 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:41,958 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:41,959 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:41,962 INFO L180 QuantifierPusher]: treesize reduction 24, result has 77.1 percent of original size [2021-11-03 04:24:41,963 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-03 04:24:41,964 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:41,968 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:41,968 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:41,969 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:41,969 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:41,970 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:41,972 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:24:41,974 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:24:41,978 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:24:41,980 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:24:41,981 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 04:24:43,109 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 04:24:43,109 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:24:43,110 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [83, 83, 83] total 128 [2021-11-03 04:24:43,110 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [549782004] [2021-11-03 04:24:43,110 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 128 states [2021-11-03 04:24:43,110 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:24:43,111 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 128 interpolants. [2021-11-03 04:24:43,112 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3810, Invalid=14822, Unknown=0, NotChecked=0, Total=18632 [2021-11-03 04:24:43,112 INFO L87 Difference]: Start difference. First operand 249 states and 251 transitions. Second operand has 128 states, 128 states have (on average 3.3203125) internal successors, (425), 128 states have internal predecessors, (425), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:24:46,108 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:24:46,108 INFO L93 Difference]: Finished difference Result 702 states and 747 transitions. [2021-11-03 04:24:46,109 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 124 states. [2021-11-03 04:24:46,109 INFO L78 Accepts]: Start accepts. Automaton has has 128 states, 128 states have (on average 3.3203125) internal successors, (425), 128 states have internal predecessors, (425), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 248 [2021-11-03 04:24:46,109 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:24:46,111 INFO L225 Difference]: With dead ends: 702 [2021-11-03 04:24:46,111 INFO L226 Difference]: Without dead ends: 376 [2021-11-03 04:24:46,115 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 906 GetRequests, 690 SyntacticMatches, 0 SemanticMatches, 216 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12214 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=10656, Invalid=36650, Unknown=0, NotChecked=0, Total=47306 [2021-11-03 04:24:46,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 376 states. [2021-11-03 04:24:46,144 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 376 to 253. [2021-11-03 04:24:46,145 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 253 states, 252 states have (on average 1.0119047619047619) internal successors, (255), 252 states have internal predecessors, (255), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:24:46,146 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 253 states to 253 states and 255 transitions. [2021-11-03 04:24:46,146 INFO L78 Accepts]: Start accepts. Automaton has 253 states and 255 transitions. Word has length 248 [2021-11-03 04:24:46,146 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:24:46,146 INFO L470 AbstractCegarLoop]: Abstraction has 253 states and 255 transitions. [2021-11-03 04:24:46,147 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 128 states, 128 states have (on average 3.3203125) internal successors, (425), 128 states have internal predecessors, (425), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:24:46,147 INFO L276 IsEmpty]: Start isEmpty. Operand 253 states and 255 transitions. [2021-11-03 04:24:46,148 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 253 [2021-11-03 04:24:46,148 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:24:46,148 INFO L513 BasicCegarLoop]: trace histogram [42, 41, 41, 40, 40, 40, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:24:46,202 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Forceful destruction successful, exit code 0 [2021-11-03 04:24:46,363 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1290,45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:24:46,364 INFO L402 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:24:46,364 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:24:46,364 INFO L85 PathProgramCache]: Analyzing trace with hash -57915435, now seen corresponding path program 45 times [2021-11-03 04:24:46,364 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:24:46,364 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2078682382] [2021-11-03 04:24:46,364 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:24:46,364 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:24:46,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:24:47,203 INFO L134 CoverageAnalysis]: Checked inductivity of 4922 backedges. 1640 proven. 3282 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:24:47,203 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:24:47,203 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2078682382] [2021-11-03 04:24:47,203 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2078682382] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:24:47,203 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1597220314] [2021-11-03 04:24:47,203 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-03 04:24:47,203 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:24:47,203 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:24:47,206 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:24:47,207 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2021-11-03 04:24:51,262 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-03 04:24:51,262 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 04:24:51,267 INFO L263 TraceCheckSpWp]: Trace formula consists of 941 conjuncts, 85 conjunts are in the unsatisfiable core [2021-11-03 04:24:51,269 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:24:51,872 INFO L134 CoverageAnalysis]: Checked inductivity of 4922 backedges. 1722 proven. 3200 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:24:51,872 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:24:52,542 INFO L134 CoverageAnalysis]: Checked inductivity of 4922 backedges. 1722 proven. 3200 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:24:52,542 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1597220314] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:24:52,542 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [610571968] [2021-11-03 04:24:52,543 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-03 04:24:52,543 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:24:52,543 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:24:52,544 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:24:52,544 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:24:52,546 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:52,547 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:24:52,547 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:52,548 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 04:24:52,548 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:24:52,548 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:52,549 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 04:24:52,550 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-03 04:24:52,551 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_52|], 10=[|v_#valid_53|]} [2021-11-03 04:24:52,557 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:24:52,558 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-03 04:24:52,558 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:52,559 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:24:52,559 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:52,560 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:24:52,560 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 04:24:52,560 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:52,562 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:52,565 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:24:52,566 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:24:52,567 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:24:52,571 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:24:52,572 INFO L388 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 23 treesize of output 22 [2021-11-03 04:24:52,572 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:52,574 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:24:52,574 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:52,574 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:24:52,575 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 04:24:52,575 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:52,577 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:52,578 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:52,579 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:24:52,579 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 04:24:52,579 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-03 04:24:52,584 INFO L180 QuantifierPusher]: treesize reduction 13, result has 87.3 percent of original size [2021-11-03 04:24:52,585 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:24:52,588 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:52,590 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:24:52,590 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:52,592 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:24:52,593 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 88 [2021-11-03 04:24:52,595 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.4 percent of original size [2021-11-03 04:24:52,663 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 95 [2021-11-03 04:24:52,666 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:52,671 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:52,672 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:52,673 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:52,673 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:52,674 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:52,676 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:52,678 INFO L180 QuantifierPusher]: treesize reduction 24, result has 72.4 percent of original size [2021-11-03 04:24:52,680 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 42 [2021-11-03 04:24:52,683 INFO L180 QuantifierPusher]: treesize reduction 24, result has 68.0 percent of original size [2021-11-03 04:24:52,683 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:24:52,684 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:52,685 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 04:24:52,685 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 34 [2021-11-03 04:24:52,687 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:52,688 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 75 [2021-11-03 04:24:52,690 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:52,692 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:52,694 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:52,699 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:52,700 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 132 [2021-11-03 04:24:52,702 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:24:52,704 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 152 [2021-11-03 04:24:52,706 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:52,712 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:52,713 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:52,713 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:52,714 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:52,714 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:52,715 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:52,716 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:52,718 INFO L180 QuantifierPusher]: treesize reduction 24, result has 77.1 percent of original size [2021-11-03 04:24:52,720 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-03 04:24:52,721 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:52,724 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:52,725 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:52,725 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:52,726 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:52,727 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:24:52,729 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:24:52,731 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:24:52,735 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:24:52,736 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:24:52,737 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 04:24:53,502 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 04:24:53,502 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:24:53,502 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 47 [2021-11-03 04:24:53,502 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [516052704] [2021-11-03 04:24:53,503 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-03 04:24:53,503 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:24:53,503 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-03 04:24:53,503 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1045, Invalid=2147, Unknown=0, NotChecked=0, Total=3192 [2021-11-03 04:24:53,504 INFO L87 Difference]: Start difference. First operand 253 states and 255 transitions. Second operand has 48 states, 48 states have (on average 5.6875) internal successors, (273), 47 states have internal predecessors, (273), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:24:54,389 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:24:54,389 INFO L93 Difference]: Finished difference Result 270 states and 273 transitions. [2021-11-03 04:24:54,389 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 90 states. [2021-11-03 04:24:54,390 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 5.6875) internal successors, (273), 47 states have internal predecessors, (273), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 252 [2021-11-03 04:24:54,390 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:24:54,391 INFO L225 Difference]: With dead ends: 270 [2021-11-03 04:24:54,391 INFO L226 Difference]: Without dead ends: 268 [2021-11-03 04:24:54,392 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 882 GetRequests, 782 SyntacticMatches, 1 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2811 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=3118, Invalid=6982, Unknown=0, NotChecked=0, Total=10100 [2021-11-03 04:24:54,393 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 268 states. [2021-11-03 04:24:54,417 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 268 to 261. [2021-11-03 04:24:54,417 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 261 states, 260 states have (on average 1.0115384615384615) internal successors, (263), 260 states have internal predecessors, (263), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:24:54,418 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 261 states to 261 states and 263 transitions. [2021-11-03 04:24:54,418 INFO L78 Accepts]: Start accepts. Automaton has 261 states and 263 transitions. Word has length 252 [2021-11-03 04:24:54,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:24:54,419 INFO L470 AbstractCegarLoop]: Abstraction has 261 states and 263 transitions. [2021-11-03 04:24:54,419 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 5.6875) internal successors, (273), 47 states have internal predecessors, (273), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:24:54,419 INFO L276 IsEmpty]: Start isEmpty. Operand 261 states and 263 transitions. [2021-11-03 04:24:54,420 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 261 [2021-11-03 04:24:54,421 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:24:54,421 INFO L513 BasicCegarLoop]: trace histogram [43, 42, 42, 42, 42, 41, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:24:54,455 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Ended with exit code 0 [2021-11-03 04:24:54,623 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1317,46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:24:54,624 INFO L402 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:24:54,624 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:24:54,624 INFO L85 PathProgramCache]: Analyzing trace with hash -1307446085, now seen corresponding path program 46 times [2021-11-03 04:24:54,624 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:24:54,624 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1996384730] [2021-11-03 04:24:54,624 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:24:54,624 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:24:54,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:24:56,832 INFO L134 CoverageAnalysis]: Checked inductivity of 5250 backedges. 3405 proven. 1845 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:24:56,832 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:24:56,833 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1996384730] [2021-11-03 04:24:56,833 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1996384730] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:24:56,833 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1510162903] [2021-11-03 04:24:56,833 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-03 04:24:56,833 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:24:56,833 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:24:56,834 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:24:56,835 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2021-11-03 04:25:01,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:25:01,009 INFO L263 TraceCheckSpWp]: Trace formula consists of 965 conjuncts, 86 conjunts are in the unsatisfiable core [2021-11-03 04:25:01,012 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:25:04,495 INFO L134 CoverageAnalysis]: Checked inductivity of 5250 backedges. 3526 proven. 1722 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-03 04:25:04,496 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:25:05,126 INFO L134 CoverageAnalysis]: Checked inductivity of 5250 backedges. 3526 proven. 1722 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-03 04:25:05,126 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1510162903] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:25:05,126 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1513097316] [2021-11-03 04:25:05,127 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-03 04:25:05,127 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:25:05,128 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:25:05,128 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:25:05,128 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:25:05,130 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:25:05,130 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:25:05,130 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:25:05,131 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 04:25:05,131 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:25:05,131 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:25:05,131 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 04:25:05,132 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-03 04:25:05,133 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_53|], 10=[|v_#valid_54|]} [2021-11-03 04:25:05,137 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:25:05,138 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-03 04:25:05,138 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:25:05,139 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:25:05,139 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:25:05,139 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:25:05,139 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 04:25:05,140 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:05,141 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:25:05,143 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:25:05,144 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:25:05,144 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:25:05,147 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:25:05,148 INFO L388 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 23 treesize of output 22 [2021-11-03 04:25:05,148 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:25:05,149 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:25:05,149 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:25:05,150 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:25:05,150 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 04:25:05,150 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:05,151 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:25:05,152 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:25:05,152 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:25:05,153 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 04:25:05,153 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-03 04:25:05,156 INFO L180 QuantifierPusher]: treesize reduction 13, result has 87.3 percent of original size [2021-11-03 04:25:05,157 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:25:05,159 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:25:05,160 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:25:05,161 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:25:05,162 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:25:05,162 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 88 [2021-11-03 04:25:05,164 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.4 percent of original size [2021-11-03 04:25:05,166 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 95 [2021-11-03 04:25:05,168 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:05,171 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:05,172 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:05,172 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:05,172 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:05,173 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:05,174 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:05,176 INFO L180 QuantifierPusher]: treesize reduction 24, result has 72.4 percent of original size [2021-11-03 04:25:05,178 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 42 [2021-11-03 04:25:05,181 INFO L180 QuantifierPusher]: treesize reduction 24, result has 68.0 percent of original size [2021-11-03 04:25:05,182 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:25:05,182 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:25:05,183 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 04:25:05,184 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 34 [2021-11-03 04:25:05,186 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:25:05,187 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 73 [2021-11-03 04:25:05,188 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:05,191 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:05,193 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:05,197 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:25:05,199 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 121 [2021-11-03 04:25:05,201 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:25:05,203 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 141 [2021-11-03 04:25:05,205 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:05,212 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:05,212 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:05,213 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:05,213 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:05,213 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:05,214 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:05,215 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:05,218 INFO L180 QuantifierPusher]: treesize reduction 24, result has 77.1 percent of original size [2021-11-03 04:25:05,219 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-03 04:25:05,221 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:05,224 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:05,224 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:05,225 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:05,225 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:05,226 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:05,228 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:25:05,230 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:25:05,247 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:25:05,250 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:25:05,251 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 04:25:06,398 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 04:25:06,398 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:25:06,398 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [87, 86, 86] total 131 [2021-11-03 04:25:06,398 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1838401066] [2021-11-03 04:25:06,399 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 131 states [2021-11-03 04:25:06,399 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:25:06,400 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 131 interpolants. [2021-11-03 04:25:06,401 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3943, Invalid=15517, Unknown=0, NotChecked=0, Total=19460 [2021-11-03 04:25:06,401 INFO L87 Difference]: Start difference. First operand 261 states and 263 transitions. Second operand has 131 states, 131 states have (on average 3.3282442748091605) internal successors, (436), 131 states have internal predecessors, (436), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:25:08,305 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:25:08,306 INFO L93 Difference]: Finished difference Result 562 states and 607 transitions. [2021-11-03 04:25:08,306 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2021-11-03 04:25:08,306 INFO L78 Accepts]: Start accepts. Automaton has has 131 states, 131 states have (on average 3.3282442748091605) internal successors, (436), 131 states have internal predecessors, (436), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 260 [2021-11-03 04:25:08,306 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:25:08,308 INFO L225 Difference]: With dead ends: 562 [2021-11-03 04:25:08,308 INFO L226 Difference]: Without dead ends: 389 [2021-11-03 04:25:08,310 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 907 GetRequests, 727 SyntacticMatches, 0 SemanticMatches, 180 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8100 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=7557, Invalid=25385, Unknown=0, NotChecked=0, Total=32942 [2021-11-03 04:25:08,311 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 389 states. [2021-11-03 04:25:08,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 389 to 263. [2021-11-03 04:25:08,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 263 states, 262 states have (on average 1.0114503816793894) internal successors, (265), 262 states have internal predecessors, (265), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:25:08,362 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 263 states to 263 states and 265 transitions. [2021-11-03 04:25:08,362 INFO L78 Accepts]: Start accepts. Automaton has 263 states and 265 transitions. Word has length 260 [2021-11-03 04:25:08,362 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:25:08,362 INFO L470 AbstractCegarLoop]: Abstraction has 263 states and 265 transitions. [2021-11-03 04:25:08,363 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 131 states, 131 states have (on average 3.3282442748091605) internal successors, (436), 131 states have internal predecessors, (436), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:25:08,363 INFO L276 IsEmpty]: Start isEmpty. Operand 263 states and 265 transitions. [2021-11-03 04:25:08,364 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 263 [2021-11-03 04:25:08,364 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:25:08,365 INFO L513 BasicCegarLoop]: trace histogram [43, 43, 42, 42, 42, 42, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:25:08,411 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Forceful destruction successful, exit code 0 [2021-11-03 04:25:08,587 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1344 [2021-11-03 04:25:08,588 INFO L402 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:25:08,588 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:25:08,588 INFO L85 PathProgramCache]: Analyzing trace with hash 1811877792, now seen corresponding path program 47 times [2021-11-03 04:25:08,588 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:25:08,588 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [876025237] [2021-11-03 04:25:08,588 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:25:08,588 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:25:08,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:25:10,761 INFO L134 CoverageAnalysis]: Checked inductivity of 5334 backedges. 3405 proven. 1929 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:25:10,761 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:25:10,762 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [876025237] [2021-11-03 04:25:10,762 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [876025237] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:25:10,762 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [473304341] [2021-11-03 04:25:10,762 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-03 04:25:10,762 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:25:10,762 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:25:10,763 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:25:10,764 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Waiting until timeout for monitored process [2021-11-03 04:25:15,272 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 43 check-sat command(s) [2021-11-03 04:25:15,272 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 04:25:15,277 INFO L263 TraceCheckSpWp]: Trace formula consists of 975 conjuncts, 88 conjunts are in the unsatisfiable core [2021-11-03 04:25:15,280 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:25:17,905 INFO L134 CoverageAnalysis]: Checked inductivity of 5334 backedges. 1806 proven. 3528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:25:17,905 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:25:18,567 INFO L134 CoverageAnalysis]: Checked inductivity of 5334 backedges. 1806 proven. 3528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:25:18,567 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [473304341] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:25:18,567 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1085064563] [2021-11-03 04:25:18,568 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-03 04:25:18,568 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:25:18,568 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:25:18,568 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:25:18,568 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:25:18,580 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:25:18,581 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:25:18,582 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:25:18,582 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 04:25:18,582 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:25:18,583 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:25:18,583 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 04:25:18,584 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-03 04:25:18,586 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_54|], 10=[|v_#valid_55|]} [2021-11-03 04:25:18,591 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:25:18,592 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-03 04:25:18,592 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:25:18,593 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:25:18,593 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:25:18,594 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:25:18,594 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 04:25:18,594 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:18,596 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:25:18,599 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:25:18,599 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:25:18,600 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:25:18,603 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:25:18,603 INFO L388 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 23 treesize of output 22 [2021-11-03 04:25:18,604 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:25:18,605 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:25:18,605 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:25:18,606 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:25:18,606 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 04:25:18,606 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:18,607 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:25:18,608 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:25:18,608 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:25:18,609 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 04:25:18,609 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-03 04:25:18,612 INFO L180 QuantifierPusher]: treesize reduction 13, result has 87.3 percent of original size [2021-11-03 04:25:18,613 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:25:18,615 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:25:18,616 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:25:18,616 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:25:18,617 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:25:18,618 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 88 [2021-11-03 04:25:18,620 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.4 percent of original size [2021-11-03 04:25:18,622 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 91 [2021-11-03 04:25:18,623 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:18,626 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:18,627 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:18,628 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:18,628 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:18,629 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:18,630 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:18,633 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:25:18,636 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 97 [2021-11-03 04:25:18,637 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:18,642 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:18,642 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:18,643 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:18,643 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:18,643 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:18,644 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:18,646 INFO L180 QuantifierPusher]: treesize reduction 24, result has 72.4 percent of original size [2021-11-03 04:25:18,648 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 42 [2021-11-03 04:25:18,651 INFO L180 QuantifierPusher]: treesize reduction 24, result has 68.0 percent of original size [2021-11-03 04:25:18,652 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:25:18,652 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:25:18,654 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 04:25:18,654 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 34 [2021-11-03 04:25:18,656 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:25:18,657 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 75 [2021-11-03 04:25:18,658 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:18,661 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:18,663 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:18,667 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:25:18,669 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 132 [2021-11-03 04:25:18,670 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:25:18,672 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 152 [2021-11-03 04:25:18,674 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:18,681 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:18,681 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:18,682 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:18,682 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:18,683 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:18,683 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:18,687 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:18,690 INFO L180 QuantifierPusher]: treesize reduction 24, result has 77.1 percent of original size [2021-11-03 04:25:18,691 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-03 04:25:18,693 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:18,696 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:18,696 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:18,697 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:18,697 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:18,698 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:18,701 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:25:18,702 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:25:18,706 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:25:18,708 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:25:18,709 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 04:25:19,883 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 04:25:19,883 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:25:19,883 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [88, 45, 45] total 132 [2021-11-03 04:25:19,884 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1596730745] [2021-11-03 04:25:19,884 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 132 states [2021-11-03 04:25:19,884 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:25:19,885 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 132 interpolants. [2021-11-03 04:25:19,886 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3047, Invalid=16693, Unknown=0, NotChecked=0, Total=19740 [2021-11-03 04:25:19,886 INFO L87 Difference]: Start difference. First operand 263 states and 265 transitions. Second operand has 132 states, 132 states have (on average 3.962121212121212) internal successors, (523), 132 states have internal predecessors, (523), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:25:25,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:25:25,509 INFO L93 Difference]: Finished difference Result 576 states and 623 transitions. [2021-11-03 04:25:25,509 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 177 states. [2021-11-03 04:25:25,509 INFO L78 Accepts]: Start accepts. Automaton has has 132 states, 132 states have (on average 3.962121212121212) internal successors, (523), 132 states have internal predecessors, (523), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 262 [2021-11-03 04:25:25,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:25:25,511 INFO L225 Difference]: With dead ends: 576 [2021-11-03 04:25:25,511 INFO L226 Difference]: Without dead ends: 401 [2021-11-03 04:25:25,515 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 1087 GetRequests, 775 SyntacticMatches, 1 SemanticMatches, 311 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33778 ImplicationChecksByTransitivity, 8.9s TimeCoverageRelationStatistics Valid=14832, Invalid=82824, Unknown=0, NotChecked=0, Total=97656 [2021-11-03 04:25:25,517 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 401 states. [2021-11-03 04:25:25,548 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 401 to 269. [2021-11-03 04:25:25,549 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 269 states, 268 states have (on average 1.0111940298507462) internal successors, (271), 268 states have internal predecessors, (271), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:25:25,549 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 269 states to 269 states and 271 transitions. [2021-11-03 04:25:25,549 INFO L78 Accepts]: Start accepts. Automaton has 269 states and 271 transitions. Word has length 262 [2021-11-03 04:25:25,549 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:25:25,550 INFO L470 AbstractCegarLoop]: Abstraction has 269 states and 271 transitions. [2021-11-03 04:25:25,550 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 132 states, 132 states have (on average 3.962121212121212) internal successors, (523), 132 states have internal predecessors, (523), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:25:25,550 INFO L276 IsEmpty]: Start isEmpty. Operand 269 states and 271 transitions. [2021-11-03 04:25:25,551 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 269 [2021-11-03 04:25:25,551 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:25:25,551 INFO L513 BasicCegarLoop]: trace histogram [44, 44, 43, 43, 43, 43, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:25:25,586 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Forceful destruction successful, exit code 0 [2021-11-03 04:25:25,751 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1371,48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:25:25,752 INFO L402 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:25:25,752 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:25:25,752 INFO L85 PathProgramCache]: Analyzing trace with hash -1043592072, now seen corresponding path program 48 times [2021-11-03 04:25:25,752 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:25:25,752 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [846161694] [2021-11-03 04:25:25,752 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:25:25,752 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:25:25,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:25:28,095 INFO L134 CoverageAnalysis]: Checked inductivity of 5590 backedges. 3572 proven. 2018 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:25:28,095 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:25:28,095 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [846161694] [2021-11-03 04:25:28,095 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [846161694] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:25:28,095 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [473088006] [2021-11-03 04:25:28,095 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-03 04:25:28,095 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:25:28,096 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:25:28,096 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:25:28,097 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Waiting until timeout for monitored process [2021-11-03 04:25:32,616 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-03 04:25:32,616 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 04:25:32,622 INFO L263 TraceCheckSpWp]: Trace formula consists of 997 conjuncts, 90 conjunts are in the unsatisfiable core [2021-11-03 04:25:32,625 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:25:36,262 INFO L134 CoverageAnalysis]: Checked inductivity of 5590 backedges. 3698 proven. 1892 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:25:36,262 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:25:36,916 INFO L134 CoverageAnalysis]: Checked inductivity of 5590 backedges. 3698 proven. 1892 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:25:36,917 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [473088006] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:25:36,917 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1322437674] [2021-11-03 04:25:36,918 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-03 04:25:36,918 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:25:36,918 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:25:36,918 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:25:36,918 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:25:36,920 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:25:36,920 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:25:36,920 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:25:36,921 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 04:25:36,921 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:25:36,921 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:25:36,922 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 04:25:36,922 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-03 04:25:36,923 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_55|], 10=[|v_#valid_56|]} [2021-11-03 04:25:36,927 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:25:36,928 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-03 04:25:36,928 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:25:36,929 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:25:36,929 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:25:36,929 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:25:36,929 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 04:25:36,929 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:36,931 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:25:36,935 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:25:36,935 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:25:36,936 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:25:36,939 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:25:36,939 INFO L388 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 23 treesize of output 22 [2021-11-03 04:25:36,940 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:25:36,941 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:25:36,941 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:25:36,941 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:25:36,941 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 04:25:36,942 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:36,943 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:25:36,943 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:25:36,944 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:25:36,944 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 04:25:36,944 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-03 04:25:36,947 INFO L180 QuantifierPusher]: treesize reduction 13, result has 87.3 percent of original size [2021-11-03 04:25:36,948 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:25:36,963 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:25:36,965 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:25:36,965 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:25:36,967 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:25:36,968 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 88 [2021-11-03 04:25:36,970 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.4 percent of original size [2021-11-03 04:25:36,973 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 04:25:36,975 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:36,980 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:36,985 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:36,986 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:36,986 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:36,987 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:36,988 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:36,991 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:25:36,994 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 96 [2021-11-03 04:25:36,995 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:36,999 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:37,000 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:37,000 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:37,001 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:37,001 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:37,002 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:37,005 INFO L180 QuantifierPusher]: treesize reduction 24, result has 72.4 percent of original size [2021-11-03 04:25:37,008 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 42 [2021-11-03 04:25:37,011 INFO L180 QuantifierPusher]: treesize reduction 24, result has 68.0 percent of original size [2021-11-03 04:25:37,012 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:25:37,012 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:25:37,013 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 04:25:37,013 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 34 [2021-11-03 04:25:37,015 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:25:37,016 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 73 [2021-11-03 04:25:37,018 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:37,020 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:37,022 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:37,026 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:25:37,028 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 121 [2021-11-03 04:25:37,029 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:25:37,035 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 141 [2021-11-03 04:25:37,038 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:37,046 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:37,047 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:37,047 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:37,047 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:37,048 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:37,048 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:37,050 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:37,052 INFO L180 QuantifierPusher]: treesize reduction 24, result has 77.1 percent of original size [2021-11-03 04:25:37,053 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-03 04:25:37,055 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:37,058 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:37,058 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:37,059 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:37,059 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:37,060 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:37,062 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:25:37,064 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:25:37,068 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:25:37,070 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:25:37,071 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 04:25:38,234 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 04:25:38,234 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:25:38,234 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [90, 90, 90] total 136 [2021-11-03 04:25:38,234 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [575610931] [2021-11-03 04:25:38,235 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 136 states [2021-11-03 04:25:38,235 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:25:38,236 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 136 interpolants. [2021-11-03 04:25:38,237 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4259, Invalid=16621, Unknown=0, NotChecked=0, Total=20880 [2021-11-03 04:25:38,237 INFO L87 Difference]: Start difference. First operand 269 states and 271 transitions. Second operand has 136 states, 136 states have (on average 3.2941176470588234) internal successors, (448), 136 states have internal predecessors, (448), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:25:40,227 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:25:40,227 INFO L93 Difference]: Finished difference Result 582 states and 629 transitions. [2021-11-03 04:25:40,228 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 90 states. [2021-11-03 04:25:40,228 INFO L78 Accepts]: Start accepts. Automaton has has 136 states, 136 states have (on average 3.2941176470588234) internal successors, (448), 136 states have internal predecessors, (448), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 268 [2021-11-03 04:25:40,228 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:25:40,230 INFO L225 Difference]: With dead ends: 582 [2021-11-03 04:25:40,230 INFO L226 Difference]: Without dead ends: 403 [2021-11-03 04:25:40,232 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 936 GetRequests, 749 SyntacticMatches, 0 SemanticMatches, 187 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8652 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=8221, Invalid=27311, Unknown=0, NotChecked=0, Total=35532 [2021-11-03 04:25:40,232 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 403 states. [2021-11-03 04:25:40,264 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 403 to 271. [2021-11-03 04:25:40,265 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 271 states, 270 states have (on average 1.011111111111111) internal successors, (273), 270 states have internal predecessors, (273), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:25:40,265 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 271 states to 271 states and 273 transitions. [2021-11-03 04:25:40,265 INFO L78 Accepts]: Start accepts. Automaton has 271 states and 273 transitions. Word has length 268 [2021-11-03 04:25:40,266 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:25:40,266 INFO L470 AbstractCegarLoop]: Abstraction has 271 states and 273 transitions. [2021-11-03 04:25:40,266 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 136 states, 136 states have (on average 3.2941176470588234) internal successors, (448), 136 states have internal predecessors, (448), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:25:40,266 INFO L276 IsEmpty]: Start isEmpty. Operand 271 states and 273 transitions. [2021-11-03 04:25:40,268 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 271 [2021-11-03 04:25:40,268 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:25:40,268 INFO L513 BasicCegarLoop]: trace histogram [45, 44, 44, 43, 43, 43, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:25:40,321 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Ended with exit code 0 [2021-11-03 04:25:40,483 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1405,49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:25:40,484 INFO L402 AbstractCegarLoop]: === Iteration 52 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:25:40,484 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:25:40,484 INFO L85 PathProgramCache]: Analyzing trace with hash -751406499, now seen corresponding path program 49 times [2021-11-03 04:25:40,484 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:25:40,484 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1800377307] [2021-11-03 04:25:40,484 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:25:40,484 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:25:40,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:25:41,789 INFO L134 CoverageAnalysis]: Checked inductivity of 5678 backedges. 1892 proven. 3786 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:25:41,789 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:25:41,789 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1800377307] [2021-11-03 04:25:41,790 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1800377307] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:25:41,790 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [767438597] [2021-11-03 04:25:41,790 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-03 04:25:41,790 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:25:41,790 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:25:41,791 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:25:41,792 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Waiting until timeout for monitored process [2021-11-03 04:25:46,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:25:46,506 INFO L263 TraceCheckSpWp]: Trace formula consists of 1007 conjuncts, 91 conjunts are in the unsatisfiable core [2021-11-03 04:25:46,508 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:25:47,169 INFO L134 CoverageAnalysis]: Checked inductivity of 5678 backedges. 1980 proven. 3698 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:25:47,169 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:25:47,856 INFO L134 CoverageAnalysis]: Checked inductivity of 5678 backedges. 1980 proven. 3698 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:25:47,856 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [767438597] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:25:47,856 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1037383282] [2021-11-03 04:25:47,857 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-03 04:25:47,857 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:25:47,857 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:25:47,857 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:25:47,857 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:25:47,859 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:25:47,860 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:25:47,860 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:25:47,860 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 04:25:47,860 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:25:47,861 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:25:47,861 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 04:25:47,862 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-03 04:25:47,864 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_56|], 10=[|v_#valid_57|]} [2021-11-03 04:25:47,869 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:25:47,869 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-03 04:25:47,869 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:25:47,870 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:25:47,870 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:25:47,870 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:25:47,870 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 04:25:47,883 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:47,885 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:25:47,888 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:25:47,889 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:25:47,890 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:25:47,895 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:25:47,896 INFO L388 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 23 treesize of output 22 [2021-11-03 04:25:47,896 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:25:47,898 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:25:47,898 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:25:47,899 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:25:47,899 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 04:25:47,899 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:47,901 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:25:47,902 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:25:47,903 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:25:47,903 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 04:25:47,904 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-03 04:25:47,908 INFO L180 QuantifierPusher]: treesize reduction 13, result has 87.3 percent of original size [2021-11-03 04:25:47,910 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:25:47,912 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:25:47,914 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:25:47,915 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:25:47,916 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:25:47,917 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 88 [2021-11-03 04:25:47,920 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.4 percent of original size [2021-11-03 04:25:47,922 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 95 [2021-11-03 04:25:47,925 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:47,930 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:47,931 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:47,931 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:47,932 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:47,933 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:47,934 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:47,937 INFO L180 QuantifierPusher]: treesize reduction 24, result has 72.4 percent of original size [2021-11-03 04:25:47,940 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 42 [2021-11-03 04:25:47,944 INFO L180 QuantifierPusher]: treesize reduction 24, result has 68.0 percent of original size [2021-11-03 04:25:47,945 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:25:47,945 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:25:47,947 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 04:25:47,947 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 34 [2021-11-03 04:25:47,950 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:25:47,951 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 73 [2021-11-03 04:25:47,953 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:47,957 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:47,960 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:47,967 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:25:47,969 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 121 [2021-11-03 04:25:47,971 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:25:47,974 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 141 [2021-11-03 04:25:47,976 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:47,986 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:47,987 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:47,987 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:47,988 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:47,988 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:47,989 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:47,991 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:47,995 INFO L180 QuantifierPusher]: treesize reduction 24, result has 77.1 percent of original size [2021-11-03 04:25:47,997 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-03 04:25:47,999 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:48,003 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:48,003 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:48,004 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:48,004 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:48,005 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:25:48,007 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:25:48,009 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:25:48,013 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:25:48,015 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:25:48,016 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 04:25:48,752 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 04:25:48,752 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:25:48,753 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 50 [2021-11-03 04:25:48,753 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1346296290] [2021-11-03 04:25:48,753 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2021-11-03 04:25:48,754 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:25:48,754 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-11-03 04:25:48,754 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1183, Invalid=2357, Unknown=0, NotChecked=0, Total=3540 [2021-11-03 04:25:48,755 INFO L87 Difference]: Start difference. First operand 271 states and 273 transitions. Second operand has 51 states, 51 states have (on average 5.705882352941177) internal successors, (291), 50 states have internal predecessors, (291), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:25:49,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:25:49,735 INFO L93 Difference]: Finished difference Result 288 states and 291 transitions. [2021-11-03 04:25:49,736 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2021-11-03 04:25:49,736 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 5.705882352941177) internal successors, (291), 50 states have internal predecessors, (291), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 270 [2021-11-03 04:25:49,736 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:25:49,737 INFO L225 Difference]: With dead ends: 288 [2021-11-03 04:25:49,737 INFO L226 Difference]: Without dead ends: 286 [2021-11-03 04:25:49,738 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 945 GetRequests, 839 SyntacticMatches, 1 SemanticMatches, 105 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3144 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=3538, Invalid=7804, Unknown=0, NotChecked=0, Total=11342 [2021-11-03 04:25:49,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 286 states. [2021-11-03 04:25:49,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 286 to 279. [2021-11-03 04:25:49,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 279 states, 278 states have (on average 1.0107913669064748) internal successors, (281), 278 states have internal predecessors, (281), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:25:49,760 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 279 states to 279 states and 281 transitions. [2021-11-03 04:25:49,760 INFO L78 Accepts]: Start accepts. Automaton has 279 states and 281 transitions. Word has length 270 [2021-11-03 04:25:49,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:25:49,760 INFO L470 AbstractCegarLoop]: Abstraction has 279 states and 281 transitions. [2021-11-03 04:25:49,760 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 5.705882352941177) internal successors, (291), 50 states have internal predecessors, (291), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:25:49,760 INFO L276 IsEmpty]: Start isEmpty. Operand 279 states and 281 transitions. [2021-11-03 04:25:49,762 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 279 [2021-11-03 04:25:49,762 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:25:49,762 INFO L513 BasicCegarLoop]: trace histogram [46, 45, 45, 45, 45, 44, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:25:49,800 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Forceful destruction successful, exit code 0 [2021-11-03 04:25:49,962 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1439,50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:25:49,962 INFO L402 AbstractCegarLoop]: === Iteration 53 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:25:49,963 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:25:49,963 INFO L85 PathProgramCache]: Analyzing trace with hash 1028462403, now seen corresponding path program 50 times [2021-11-03 04:25:49,963 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:25:49,963 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1330738181] [2021-11-03 04:25:49,963 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:25:49,963 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:25:50,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:25:52,568 INFO L134 CoverageAnalysis]: Checked inductivity of 6030 backedges. 3918 proven. 2112 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:25:52,568 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:25:52,569 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1330738181] [2021-11-03 04:25:52,569 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1330738181] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:25:52,569 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [543178940] [2021-11-03 04:25:52,569 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-03 04:25:52,569 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:25:52,569 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:25:52,571 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:25:52,572 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Waiting until timeout for monitored process [2021-11-03 04:25:57,592 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 46 check-sat command(s) [2021-11-03 04:25:57,592 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 04:25:57,598 INFO L263 TraceCheckSpWp]: Trace formula consists of 1031 conjuncts, 93 conjunts are in the unsatisfiable core [2021-11-03 04:25:57,600 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:26:01,430 INFO L134 CoverageAnalysis]: Checked inductivity of 6030 backedges. 4050 proven. 1980 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:26:01,431 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:26:02,222 INFO L134 CoverageAnalysis]: Checked inductivity of 6030 backedges. 4050 proven. 1980 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:26:02,223 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [543178940] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:26:02,223 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1569179377] [2021-11-03 04:26:02,223 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-03 04:26:02,224 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:26:02,224 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:26:02,224 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:26:02,224 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:26:02,226 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:26:02,227 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:26:02,227 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:26:02,228 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 04:26:02,228 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:26:02,228 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:26:02,228 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 04:26:02,229 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-03 04:26:02,230 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_57|], 10=[|v_#valid_58|]} [2021-11-03 04:26:02,234 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:26:02,235 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-03 04:26:02,235 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:26:02,235 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:26:02,236 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:26:02,236 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:26:02,236 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 04:26:02,236 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:02,238 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:26:02,240 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:26:02,240 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:26:02,241 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:26:02,244 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:26:02,244 INFO L388 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 23 treesize of output 22 [2021-11-03 04:26:02,245 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:26:02,246 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:26:02,246 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:26:02,246 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:26:02,246 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 04:26:02,247 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:02,248 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:26:02,248 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:26:02,256 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:26:02,256 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 04:26:02,257 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-03 04:26:02,261 INFO L180 QuantifierPusher]: treesize reduction 13, result has 87.3 percent of original size [2021-11-03 04:26:02,263 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:26:02,266 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:26:02,268 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:26:02,269 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:26:02,270 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:26:02,271 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 88 [2021-11-03 04:26:02,273 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.4 percent of original size [2021-11-03 04:26:02,276 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 04:26:02,278 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:02,283 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:02,284 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:02,285 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:02,286 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:02,286 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:02,288 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:02,291 INFO L180 QuantifierPusher]: treesize reduction 24, result has 72.4 percent of original size [2021-11-03 04:26:02,293 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 42 [2021-11-03 04:26:02,297 INFO L180 QuantifierPusher]: treesize reduction 24, result has 68.0 percent of original size [2021-11-03 04:26:02,298 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:26:02,299 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:26:02,300 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 04:26:02,301 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 34 [2021-11-03 04:26:02,303 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:26:02,305 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-03 04:26:02,306 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:02,309 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:02,311 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:02,316 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:26:02,317 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 121 [2021-11-03 04:26:02,319 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:26:02,321 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 141 [2021-11-03 04:26:02,323 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:02,329 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:02,329 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:02,330 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:02,330 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:02,331 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:02,331 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:02,332 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:02,335 INFO L180 QuantifierPusher]: treesize reduction 24, result has 77.1 percent of original size [2021-11-03 04:26:02,336 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-03 04:26:02,338 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:02,340 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:02,341 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:02,341 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:02,342 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:02,343 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:02,345 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:26:02,347 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:26:02,351 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:26:02,352 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:26:02,353 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 04:26:03,568 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 04:26:03,568 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:26:03,569 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [93, 93, 93] total 143 [2021-11-03 04:26:03,569 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1905466631] [2021-11-03 04:26:03,570 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 143 states [2021-11-03 04:26:03,570 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:26:03,571 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 143 interpolants. [2021-11-03 04:26:03,572 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4730, Invalid=18222, Unknown=0, NotChecked=0, Total=22952 [2021-11-03 04:26:03,572 INFO L87 Difference]: Start difference. First operand 279 states and 281 transitions. Second operand has 143 states, 143 states have (on average 3.3216783216783217) internal successors, (475), 143 states have internal predecessors, (475), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:26:07,183 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:26:07,183 INFO L93 Difference]: Finished difference Result 787 states and 837 transitions. [2021-11-03 04:26:07,183 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 139 states. [2021-11-03 04:26:07,183 INFO L78 Accepts]: Start accepts. Automaton has has 143 states, 143 states have (on average 3.3216783216783217) internal successors, (475), 143 states have internal predecessors, (475), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 278 [2021-11-03 04:26:07,184 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:26:07,185 INFO L225 Difference]: With dead ends: 787 [2021-11-03 04:26:07,185 INFO L226 Difference]: Without dead ends: 421 [2021-11-03 04:26:07,188 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 1016 GetRequests, 775 SyntacticMatches, 0 SemanticMatches, 241 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15084 ImplicationChecksByTransitivity, 8.3s TimeCoverageRelationStatistics Valid=13331, Invalid=45475, Unknown=0, NotChecked=0, Total=58806 [2021-11-03 04:26:07,189 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 421 states. [2021-11-03 04:26:07,224 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 421 to 283. [2021-11-03 04:26:07,225 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 283 states, 282 states have (on average 1.0106382978723405) internal successors, (285), 282 states have internal predecessors, (285), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:26:07,225 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 283 states to 283 states and 285 transitions. [2021-11-03 04:26:07,225 INFO L78 Accepts]: Start accepts. Automaton has 283 states and 285 transitions. Word has length 278 [2021-11-03 04:26:07,226 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:26:07,226 INFO L470 AbstractCegarLoop]: Abstraction has 283 states and 285 transitions. [2021-11-03 04:26:07,226 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 143 states, 143 states have (on average 3.3216783216783217) internal successors, (475), 143 states have internal predecessors, (475), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:26:07,226 INFO L276 IsEmpty]: Start isEmpty. Operand 283 states and 285 transitions. [2021-11-03 04:26:07,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 283 [2021-11-03 04:26:07,228 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:26:07,228 INFO L513 BasicCegarLoop]: trace histogram [47, 46, 46, 45, 45, 45, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:26:07,281 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Forceful destruction successful, exit code 0 [2021-11-03 04:26:07,455 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1466,51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:26:07,456 INFO L402 AbstractCegarLoop]: === Iteration 54 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:26:07,456 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:26:07,456 INFO L85 PathProgramCache]: Analyzing trace with hash -863970995, now seen corresponding path program 51 times [2021-11-03 04:26:07,456 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:26:07,456 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [226110108] [2021-11-03 04:26:07,456 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:26:07,456 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:26:07,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:26:08,479 INFO L134 CoverageAnalysis]: Checked inductivity of 6212 backedges. 2070 proven. 4142 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:26:08,480 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:26:08,480 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [226110108] [2021-11-03 04:26:08,480 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [226110108] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:26:08,480 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1806469418] [2021-11-03 04:26:08,480 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-03 04:26:08,481 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:26:08,481 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:26:08,481 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:26:08,482 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Waiting until timeout for monitored process [2021-11-03 04:26:13,624 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-03 04:26:13,624 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 04:26:13,630 INFO L263 TraceCheckSpWp]: Trace formula consists of 1051 conjuncts, 95 conjunts are in the unsatisfiable core [2021-11-03 04:26:13,632 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:26:14,304 INFO L134 CoverageAnalysis]: Checked inductivity of 6212 backedges. 2162 proven. 4050 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:26:14,304 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:26:14,994 INFO L134 CoverageAnalysis]: Checked inductivity of 6212 backedges. 2162 proven. 4050 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:26:14,994 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1806469418] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:26:14,994 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [797491796] [2021-11-03 04:26:14,995 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-03 04:26:14,995 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:26:14,996 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:26:14,996 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:26:14,996 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:26:15,015 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:26:15,015 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:26:15,016 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:26:15,016 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 04:26:15,017 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:26:15,017 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:26:15,018 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 04:26:15,019 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-03 04:26:15,020 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_58|], 10=[|v_#valid_59|]} [2021-11-03 04:26:15,026 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:26:15,027 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-03 04:26:15,027 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:26:15,028 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:26:15,028 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:26:15,029 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:26:15,029 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 04:26:15,029 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:15,031 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:26:15,034 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:26:15,035 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:26:15,036 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:26:15,039 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:26:15,040 INFO L388 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 23 treesize of output 22 [2021-11-03 04:26:15,041 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:26:15,042 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:26:15,042 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:26:15,043 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:26:15,043 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 04:26:15,043 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:15,044 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:26:15,045 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:26:15,045 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:26:15,045 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 04:26:15,046 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-03 04:26:15,049 INFO L180 QuantifierPusher]: treesize reduction 13, result has 87.3 percent of original size [2021-11-03 04:26:15,050 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:26:15,052 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:26:15,053 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:26:15,053 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:26:15,054 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:26:15,055 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 88 [2021-11-03 04:26:15,056 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.4 percent of original size [2021-11-03 04:26:15,058 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 95 [2021-11-03 04:26:15,060 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:15,063 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:15,064 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:15,064 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:15,065 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:15,065 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:15,066 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:15,068 INFO L180 QuantifierPusher]: treesize reduction 24, result has 72.4 percent of original size [2021-11-03 04:26:15,070 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 42 [2021-11-03 04:26:15,073 INFO L180 QuantifierPusher]: treesize reduction 24, result has 68.0 percent of original size [2021-11-03 04:26:15,074 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:26:15,074 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:26:15,075 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 04:26:15,076 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 34 [2021-11-03 04:26:15,077 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:26:15,079 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 75 [2021-11-03 04:26:15,080 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:15,082 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:15,085 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:15,089 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:26:15,090 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 132 [2021-11-03 04:26:15,092 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:26:15,094 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 152 [2021-11-03 04:26:15,096 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:15,102 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:15,103 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:15,103 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:15,103 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:15,104 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:15,104 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:15,106 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:15,110 INFO L180 QuantifierPusher]: treesize reduction 24, result has 77.1 percent of original size [2021-11-03 04:26:15,112 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-03 04:26:15,113 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:15,116 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:15,117 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:15,117 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:15,117 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:15,118 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:15,121 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:26:15,122 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:26:15,126 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:26:15,128 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:26:15,129 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 04:26:15,876 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 04:26:15,876 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:26:15,876 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 52 [2021-11-03 04:26:15,876 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [233252872] [2021-11-03 04:26:15,877 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2021-11-03 04:26:15,877 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:26:15,877 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-11-03 04:26:15,878 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1280, Invalid=2502, Unknown=0, NotChecked=0, Total=3782 [2021-11-03 04:26:15,878 INFO L87 Difference]: Start difference. First operand 283 states and 285 transitions. Second operand has 53 states, 53 states have (on average 5.716981132075472) internal successors, (303), 52 states have internal predecessors, (303), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:26:16,902 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:26:16,903 INFO L93 Difference]: Finished difference Result 300 states and 303 transitions. [2021-11-03 04:26:16,903 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2021-11-03 04:26:16,903 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 5.716981132075472) internal successors, (303), 52 states have internal predecessors, (303), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 282 [2021-11-03 04:26:16,903 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:26:16,904 INFO L225 Difference]: With dead ends: 300 [2021-11-03 04:26:16,904 INFO L226 Difference]: Without dead ends: 298 [2021-11-03 04:26:16,905 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 987 GetRequests, 877 SyntacticMatches, 1 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3376 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=3833, Invalid=8377, Unknown=0, NotChecked=0, Total=12210 [2021-11-03 04:26:16,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 298 states. [2021-11-03 04:26:16,928 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 298 to 291. [2021-11-03 04:26:16,928 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 291 states, 290 states have (on average 1.0103448275862068) internal successors, (293), 290 states have internal predecessors, (293), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:26:16,929 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 291 states to 291 states and 293 transitions. [2021-11-03 04:26:16,929 INFO L78 Accepts]: Start accepts. Automaton has 291 states and 293 transitions. Word has length 282 [2021-11-03 04:26:16,929 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:26:16,929 INFO L470 AbstractCegarLoop]: Abstraction has 291 states and 293 transitions. [2021-11-03 04:26:16,929 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 5.716981132075472) internal successors, (303), 52 states have internal predecessors, (303), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:26:16,929 INFO L276 IsEmpty]: Start isEmpty. Operand 291 states and 293 transitions. [2021-11-03 04:26:16,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 291 [2021-11-03 04:26:16,931 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:26:16,931 INFO L513 BasicCegarLoop]: trace histogram [48, 47, 47, 47, 47, 46, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:26:16,968 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Forceful destruction successful, exit code 0 [2021-11-03 04:26:17,131 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1493,52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:26:17,131 INFO L402 AbstractCegarLoop]: === Iteration 55 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:26:17,132 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:26:17,132 INFO L85 PathProgramCache]: Analyzing trace with hash -1862693325, now seen corresponding path program 52 times [2021-11-03 04:26:17,132 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:26:17,132 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [538934620] [2021-11-03 04:26:17,132 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:26:17,133 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:26:17,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:26:19,856 INFO L134 CoverageAnalysis]: Checked inductivity of 6580 backedges. 4280 proven. 2300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:26:19,856 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:26:19,856 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [538934620] [2021-11-03 04:26:19,856 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [538934620] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:26:19,857 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1731476140] [2021-11-03 04:26:19,857 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-03 04:26:19,857 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:26:19,857 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:26:19,857 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:26:19,858 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Waiting until timeout for monitored process [2021-11-03 04:26:25,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:26:25,071 INFO L263 TraceCheckSpWp]: Trace formula consists of 1075 conjuncts, 96 conjunts are in the unsatisfiable core [2021-11-03 04:26:25,073 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:26:29,213 INFO L134 CoverageAnalysis]: Checked inductivity of 6580 backedges. 4416 proven. 2162 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-03 04:26:29,213 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:26:29,961 INFO L134 CoverageAnalysis]: Checked inductivity of 6580 backedges. 4416 proven. 2162 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-03 04:26:29,961 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1731476140] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:26:29,961 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [980585139] [2021-11-03 04:26:29,962 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-03 04:26:29,962 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:26:29,962 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:26:29,963 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:26:29,963 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:26:29,965 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:26:29,965 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:26:29,966 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:26:29,967 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 04:26:29,967 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:26:29,967 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:26:29,967 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 04:26:29,968 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-03 04:26:29,972 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_59|], 10=[|v_#valid_60|]} [2021-11-03 04:26:29,976 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:26:29,979 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-03 04:26:29,982 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:26:29,982 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:26:29,982 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:26:29,983 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:26:29,983 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 04:26:29,983 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:29,985 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:26:29,987 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:26:29,988 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:26:29,989 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:26:29,991 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:26:29,992 INFO L388 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 23 treesize of output 22 [2021-11-03 04:26:29,993 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:26:29,994 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:26:29,994 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:26:29,994 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:26:29,995 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 04:26:29,995 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:29,996 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:26:29,997 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:26:29,998 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:26:29,998 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 04:26:29,998 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-03 04:26:30,002 INFO L180 QuantifierPusher]: treesize reduction 13, result has 87.3 percent of original size [2021-11-03 04:26:30,003 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:26:30,005 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:26:30,007 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:26:30,007 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:26:30,008 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:26:30,009 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 88 [2021-11-03 04:26:30,011 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.4 percent of original size [2021-11-03 04:26:30,013 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 97 [2021-11-03 04:26:30,015 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:30,019 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:30,020 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:30,021 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:30,021 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:30,022 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:30,023 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:30,026 INFO L180 QuantifierPusher]: treesize reduction 24, result has 72.4 percent of original size [2021-11-03 04:26:30,028 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 42 [2021-11-03 04:26:30,031 INFO L180 QuantifierPusher]: treesize reduction 24, result has 68.0 percent of original size [2021-11-03 04:26:30,032 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:26:30,032 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:26:30,034 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 04:26:30,034 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 34 [2021-11-03 04:26:30,036 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:26:30,038 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 75 [2021-11-03 04:26:30,039 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:30,042 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:30,045 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:30,050 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:26:30,052 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 132 [2021-11-03 04:26:30,065 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:26:30,068 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 152 [2021-11-03 04:26:30,071 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:30,083 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:30,084 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:30,085 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:30,086 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:30,087 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:30,088 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:30,090 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:30,095 INFO L180 QuantifierPusher]: treesize reduction 24, result has 77.1 percent of original size [2021-11-03 04:26:30,097 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-03 04:26:30,099 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:30,105 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:30,106 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:30,106 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:30,107 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:30,109 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:30,113 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:26:30,116 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:26:30,122 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:26:30,124 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:26:30,126 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 04:26:31,433 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 04:26:31,433 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:26:31,434 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [97, 96, 96] total 146 [2021-11-03 04:26:31,434 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1514083694] [2021-11-03 04:26:31,437 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 146 states [2021-11-03 04:26:31,437 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:26:31,439 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 146 interpolants. [2021-11-03 04:26:31,440 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4878, Invalid=18992, Unknown=0, NotChecked=0, Total=23870 [2021-11-03 04:26:31,440 INFO L87 Difference]: Start difference. First operand 291 states and 293 transitions. Second operand has 146 states, 146 states have (on average 3.328767123287671) internal successors, (486), 146 states have internal predecessors, (486), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:26:33,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:26:33,908 INFO L93 Difference]: Finished difference Result 627 states and 677 transitions. [2021-11-03 04:26:33,908 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2021-11-03 04:26:33,908 INFO L78 Accepts]: Start accepts. Automaton has has 146 states, 146 states have (on average 3.328767123287671) internal successors, (486), 146 states have internal predecessors, (486), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 290 [2021-11-03 04:26:33,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:26:33,910 INFO L225 Difference]: With dead ends: 627 [2021-11-03 04:26:33,910 INFO L226 Difference]: Without dead ends: 434 [2021-11-03 04:26:33,912 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 1012 GetRequests, 812 SyntacticMatches, 0 SemanticMatches, 200 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9885 ImplicationChecksByTransitivity, 7.6s TimeCoverageRelationStatistics Valid=9392, Invalid=31210, Unknown=0, NotChecked=0, Total=40602 [2021-11-03 04:26:33,914 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 434 states. [2021-11-03 04:26:33,937 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 434 to 293. [2021-11-03 04:26:33,937 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 293 states, 292 states have (on average 1.0102739726027397) internal successors, (295), 292 states have internal predecessors, (295), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:26:33,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 293 states to 293 states and 295 transitions. [2021-11-03 04:26:33,938 INFO L78 Accepts]: Start accepts. Automaton has 293 states and 295 transitions. Word has length 290 [2021-11-03 04:26:33,938 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:26:33,939 INFO L470 AbstractCegarLoop]: Abstraction has 293 states and 295 transitions. [2021-11-03 04:26:33,939 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 146 states, 146 states have (on average 3.328767123287671) internal successors, (486), 146 states have internal predecessors, (486), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:26:33,939 INFO L276 IsEmpty]: Start isEmpty. Operand 293 states and 295 transitions. [2021-11-03 04:26:33,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 293 [2021-11-03 04:26:33,941 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:26:33,941 INFO L513 BasicCegarLoop]: trace histogram [48, 48, 47, 47, 47, 47, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:26:33,997 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Forceful destruction successful, exit code 0 [2021-11-03 04:26:34,167 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1520 [2021-11-03 04:26:34,167 INFO L402 AbstractCegarLoop]: === Iteration 56 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:26:34,168 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:26:34,168 INFO L85 PathProgramCache]: Analyzing trace with hash 1186482776, now seen corresponding path program 53 times [2021-11-03 04:26:34,168 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:26:34,168 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1767744046] [2021-11-03 04:26:34,168 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:26:34,168 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:26:34,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:26:37,291 INFO L134 CoverageAnalysis]: Checked inductivity of 6674 backedges. 4280 proven. 2394 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:26:37,292 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:26:37,292 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1767744046] [2021-11-03 04:26:37,292 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1767744046] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:26:37,292 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1738275079] [2021-11-03 04:26:37,292 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-03 04:26:37,292 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:26:37,292 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:26:37,293 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:26:37,294 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Waiting until timeout for monitored process [2021-11-03 04:26:43,168 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 48 check-sat command(s) [2021-11-03 04:26:43,168 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 04:26:43,174 INFO L263 TraceCheckSpWp]: Trace formula consists of 1085 conjuncts, 98 conjunts are in the unsatisfiable core [2021-11-03 04:26:43,177 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:26:46,294 INFO L134 CoverageAnalysis]: Checked inductivity of 6674 backedges. 2256 proven. 4418 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:26:46,294 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:26:47,175 INFO L134 CoverageAnalysis]: Checked inductivity of 6674 backedges. 2256 proven. 4418 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:26:47,175 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1738275079] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:26:47,175 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1620621710] [2021-11-03 04:26:47,176 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-03 04:26:47,176 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:26:47,176 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:26:47,176 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:26:47,176 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:26:47,187 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:26:47,188 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:26:47,188 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:26:47,188 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 04:26:47,189 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:26:47,189 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:26:47,189 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 04:26:47,190 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-03 04:26:47,194 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_60|], 10=[|v_#valid_61|]} [2021-11-03 04:26:47,198 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:26:47,199 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-03 04:26:47,199 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:26:47,200 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:26:47,200 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:26:47,200 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:26:47,200 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 04:26:47,201 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:47,202 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:26:47,204 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:26:47,205 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:26:47,206 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:26:47,208 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:26:47,209 INFO L388 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 23 treesize of output 22 [2021-11-03 04:26:47,210 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:26:47,211 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:26:47,211 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:26:47,211 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:26:47,212 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 04:26:47,212 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:47,213 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:26:47,214 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:26:47,214 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:26:47,215 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 04:26:47,215 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-03 04:26:47,218 INFO L180 QuantifierPusher]: treesize reduction 13, result has 87.3 percent of original size [2021-11-03 04:26:47,219 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:26:47,221 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:26:47,223 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:26:47,223 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:26:47,224 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:26:47,225 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 88 [2021-11-03 04:26:47,227 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.4 percent of original size [2021-11-03 04:26:47,229 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 95 [2021-11-03 04:26:47,231 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:47,234 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:47,235 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:47,235 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:47,236 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:47,236 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:47,237 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:47,240 INFO L180 QuantifierPusher]: treesize reduction 24, result has 72.4 percent of original size [2021-11-03 04:26:47,242 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 42 [2021-11-03 04:26:47,246 INFO L180 QuantifierPusher]: treesize reduction 24, result has 68.0 percent of original size [2021-11-03 04:26:47,246 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:26:47,247 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:26:47,248 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 04:26:47,249 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 34 [2021-11-03 04:26:47,250 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:26:47,252 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 73 [2021-11-03 04:26:47,253 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:47,256 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:47,258 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:47,263 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:26:47,265 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 121 [2021-11-03 04:26:47,267 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:26:47,268 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 141 [2021-11-03 04:26:47,271 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:47,277 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:47,278 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:47,278 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:47,279 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:47,279 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:47,280 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:47,281 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:47,284 INFO L180 QuantifierPusher]: treesize reduction 24, result has 77.1 percent of original size [2021-11-03 04:26:47,286 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-03 04:26:47,288 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:47,291 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:47,292 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:47,292 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:47,293 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:47,294 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:26:47,296 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:26:47,306 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:26:47,311 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:26:47,312 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:26:47,314 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 04:26:48,551 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 04:26:48,551 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:26:48,551 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [98, 50, 50] total 147 [2021-11-03 04:26:48,551 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1170066353] [2021-11-03 04:26:48,552 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 147 states [2021-11-03 04:26:48,552 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:26:48,553 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 147 interpolants. [2021-11-03 04:26:48,554 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3757, Invalid=20423, Unknown=0, NotChecked=0, Total=24180 [2021-11-03 04:26:48,554 INFO L87 Difference]: Start difference. First operand 293 states and 295 transitions. Second operand has 147 states, 147 states have (on average 3.9659863945578233) internal successors, (583), 147 states have internal predecessors, (583), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:26:56,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:26:56,439 INFO L93 Difference]: Finished difference Result 641 states and 693 transitions. [2021-11-03 04:26:56,439 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 197 states. [2021-11-03 04:26:56,439 INFO L78 Accepts]: Start accepts. Automaton has has 147 states, 147 states have (on average 3.9659863945578233) internal successors, (583), 147 states have internal predecessors, (583), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 292 [2021-11-03 04:26:56,439 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:26:56,441 INFO L225 Difference]: With dead ends: 641 [2021-11-03 04:26:56,441 INFO L226 Difference]: Without dead ends: 446 [2021-11-03 04:26:56,447 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 1212 GetRequests, 865 SyntacticMatches, 1 SemanticMatches, 346 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41908 ImplicationChecksByTransitivity, 11.6s TimeCoverageRelationStatistics Valid=18352, Invalid=102404, Unknown=0, NotChecked=0, Total=120756 [2021-11-03 04:26:56,448 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 446 states. [2021-11-03 04:26:56,488 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 446 to 299. [2021-11-03 04:26:56,488 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 299 states, 298 states have (on average 1.0100671140939597) internal successors, (301), 298 states have internal predecessors, (301), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:26:56,489 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 299 states to 299 states and 301 transitions. [2021-11-03 04:26:56,489 INFO L78 Accepts]: Start accepts. Automaton has 299 states and 301 transitions. Word has length 292 [2021-11-03 04:26:56,490 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:26:56,490 INFO L470 AbstractCegarLoop]: Abstraction has 299 states and 301 transitions. [2021-11-03 04:26:56,490 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 147 states, 147 states have (on average 3.9659863945578233) internal successors, (583), 147 states have internal predecessors, (583), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:26:56,490 INFO L276 IsEmpty]: Start isEmpty. Operand 299 states and 301 transitions. [2021-11-03 04:26:56,492 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 299 [2021-11-03 04:26:56,492 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:26:56,492 INFO L513 BasicCegarLoop]: trace histogram [49, 49, 48, 48, 48, 48, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:26:56,553 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Forceful destruction successful, exit code 0 [2021-11-03 04:26:56,715 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1547,54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:26:56,716 INFO L402 AbstractCegarLoop]: === Iteration 57 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:26:56,716 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:26:56,716 INFO L85 PathProgramCache]: Analyzing trace with hash -212018064, now seen corresponding path program 54 times [2021-11-03 04:26:56,716 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:26:56,716 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1053557057] [2021-11-03 04:26:56,716 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:26:56,716 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:26:56,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:26:59,598 INFO L134 CoverageAnalysis]: Checked inductivity of 6960 backedges. 4467 proven. 2493 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:26:59,598 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:26:59,599 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1053557057] [2021-11-03 04:26:59,599 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1053557057] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:26:59,599 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1070247183] [2021-11-03 04:26:59,599 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-03 04:26:59,599 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:26:59,599 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:26:59,600 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:26:59,601 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Waiting until timeout for monitored process [2021-11-03 04:27:05,436 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-03 04:27:05,436 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 04:27:05,442 INFO L263 TraceCheckSpWp]: Trace formula consists of 1107 conjuncts, 100 conjunts are in the unsatisfiable core [2021-11-03 04:27:05,445 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:27:08,755 INFO L134 CoverageAnalysis]: Checked inductivity of 6960 backedges. 2352 proven. 4608 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:27:08,755 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:27:09,521 INFO L134 CoverageAnalysis]: Checked inductivity of 6960 backedges. 2352 proven. 4608 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:27:09,521 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1070247183] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:27:09,521 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1193668666] [2021-11-03 04:27:09,522 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-03 04:27:09,522 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:27:09,522 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:27:09,522 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:27:09,522 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:27:09,529 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:27:09,529 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:27:09,529 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:27:09,530 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 04:27:09,530 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:27:09,530 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:27:09,530 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 04:27:09,531 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-03 04:27:09,532 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_61|], 10=[|v_#valid_62|]} [2021-11-03 04:27:09,553 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:27:09,554 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-03 04:27:09,555 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:27:09,555 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:27:09,555 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:27:09,556 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:27:09,556 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 04:27:09,556 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:27:09,558 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:27:09,561 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:27:09,561 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:27:09,562 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:27:09,565 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:27:09,567 INFO L388 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 23 treesize of output 22 [2021-11-03 04:27:09,567 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:27:09,568 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:27:09,569 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:27:09,569 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:27:09,569 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 04:27:09,569 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:27:09,571 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:27:09,571 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:27:09,572 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:27:09,572 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 04:27:09,573 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-03 04:27:09,577 INFO L180 QuantifierPusher]: treesize reduction 13, result has 87.3 percent of original size [2021-11-03 04:27:09,579 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:27:09,582 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:27:09,584 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:27:09,585 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:27:09,586 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:27:09,587 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 88 [2021-11-03 04:27:09,589 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.4 percent of original size [2021-11-03 04:27:09,592 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 95 [2021-11-03 04:27:09,594 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:27:09,598 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:27:09,598 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:27:09,599 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:27:09,599 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:27:09,600 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:27:09,601 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:27:09,603 INFO L180 QuantifierPusher]: treesize reduction 24, result has 72.4 percent of original size [2021-11-03 04:27:09,606 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 42 [2021-11-03 04:27:09,609 INFO L180 QuantifierPusher]: treesize reduction 24, result has 68.0 percent of original size [2021-11-03 04:27:09,609 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:27:09,610 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:27:09,611 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 04:27:09,611 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 34 [2021-11-03 04:27:09,613 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:27:09,614 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-03 04:27:09,616 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:27:09,618 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:27:09,620 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:27:09,625 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:27:09,626 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 121 [2021-11-03 04:27:09,628 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:27:09,630 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 141 [2021-11-03 04:27:09,632 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:27:09,638 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:27:09,639 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:27:09,639 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:27:09,639 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:27:09,640 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:27:09,640 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:27:09,652 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:27:09,656 INFO L180 QuantifierPusher]: treesize reduction 24, result has 77.1 percent of original size [2021-11-03 04:27:09,658 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-03 04:27:09,660 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:27:09,664 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:27:09,665 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:27:09,666 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:27:09,667 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:27:09,668 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:27:09,672 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:27:09,674 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:27:09,679 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:27:09,681 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:27:09,683 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 04:27:10,938 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 04:27:10,939 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:27:10,939 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [100, 51, 51] total 150 [2021-11-03 04:27:10,939 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1773014842] [2021-11-03 04:27:10,940 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 150 states [2021-11-03 04:27:10,940 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:27:10,940 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 150 interpolants. [2021-11-03 04:27:10,942 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3908, Invalid=21214, Unknown=0, NotChecked=0, Total=25122 [2021-11-03 04:27:10,942 INFO L87 Difference]: Start difference. First operand 299 states and 301 transitions. Second operand has 150 states, 150 states have (on average 3.966666666666667) internal successors, (595), 150 states have internal predecessors, (595), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:27:18,060 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:27:18,060 INFO L93 Difference]: Finished difference Result 654 states and 707 transitions. [2021-11-03 04:27:18,061 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 201 states. [2021-11-03 04:27:18,061 INFO L78 Accepts]: Start accepts. Automaton has has 150 states, 150 states have (on average 3.966666666666667) internal successors, (595), 150 states have internal predecessors, (595), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 298 [2021-11-03 04:27:18,061 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:27:18,063 INFO L225 Difference]: With dead ends: 654 [2021-11-03 04:27:18,063 INFO L226 Difference]: Without dead ends: 455 [2021-11-03 04:27:18,071 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 1237 GetRequests, 883 SyntacticMatches, 1 SemanticMatches, 353 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43639 ImplicationChecksByTransitivity, 11.2s TimeCoverageRelationStatistics Valid=19101, Invalid=106569, Unknown=0, NotChecked=0, Total=125670 [2021-11-03 04:27:18,072 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 455 states. [2021-11-03 04:27:18,108 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 455 to 305. [2021-11-03 04:27:18,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 305 states, 304 states have (on average 1.0098684210526316) internal successors, (307), 304 states have internal predecessors, (307), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:27:18,109 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 305 states to 305 states and 307 transitions. [2021-11-03 04:27:18,109 INFO L78 Accepts]: Start accepts. Automaton has 305 states and 307 transitions. Word has length 298 [2021-11-03 04:27:18,109 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:27:18,109 INFO L470 AbstractCegarLoop]: Abstraction has 305 states and 307 transitions. [2021-11-03 04:27:18,109 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 150 states, 150 states have (on average 3.966666666666667) internal successors, (595), 150 states have internal predecessors, (595), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:27:18,110 INFO L276 IsEmpty]: Start isEmpty. Operand 305 states and 307 transitions. [2021-11-03 04:27:18,111 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 305 [2021-11-03 04:27:18,111 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:27:18,112 INFO L513 BasicCegarLoop]: trace histogram [50, 50, 49, 49, 49, 49, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:27:18,164 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Ended with exit code 0 [2021-11-03 04:27:18,335 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1574 [2021-11-03 04:27:18,335 INFO L402 AbstractCegarLoop]: === Iteration 58 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:27:18,336 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:27:18,336 INFO L85 PathProgramCache]: Analyzing trace with hash -886635832, now seen corresponding path program 55 times [2021-11-03 04:27:18,336 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:27:18,336 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2126827044] [2021-11-03 04:27:18,336 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:27:18,336 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:27:18,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:27:21,261 INFO L134 CoverageAnalysis]: Checked inductivity of 7252 backedges. 4658 proven. 2594 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:27:21,261 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:27:21,262 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2126827044] [2021-11-03 04:27:21,262 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2126827044] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:27:21,262 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1157025654] [2021-11-03 04:27:21,262 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-03 04:27:21,262 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:27:21,262 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:27:21,263 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:27:21,264 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Waiting until timeout for monitored process [2021-11-03 04:27:27,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:27:27,304 INFO L263 TraceCheckSpWp]: Trace formula consists of 1129 conjuncts, 102 conjunts are in the unsatisfiable core [2021-11-03 04:27:27,306 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:27:31,880 INFO L134 CoverageAnalysis]: Checked inductivity of 7252 backedges. 4802 proven. 2450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:27:31,880 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:27:32,668 INFO L134 CoverageAnalysis]: Checked inductivity of 7252 backedges. 4802 proven. 2450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:27:32,668 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1157025654] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:27:32,668 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [308410709] [2021-11-03 04:27:32,669 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-03 04:27:32,669 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:27:32,669 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:27:32,669 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:27:32,669 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:27:32,678 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:27:32,679 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:27:32,679 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:27:32,679 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 04:27:32,680 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:27:32,680 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:27:32,680 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 04:27:32,681 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-03 04:27:32,682 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_62|], 10=[|v_#valid_63|]} [2021-11-03 04:27:32,687 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:27:32,687 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-03 04:27:32,687 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:27:32,688 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:27:32,688 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:27:32,688 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:27:32,688 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 04:27:32,689 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:27:32,690 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:27:32,692 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:27:32,693 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:27:32,694 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:27:32,696 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:27:32,697 INFO L388 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 23 treesize of output 22 [2021-11-03 04:27:32,697 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:27:32,698 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:27:32,698 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:27:32,699 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:27:32,699 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 04:27:32,699 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:27:32,700 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:27:32,701 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:27:32,701 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:27:32,702 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 04:27:32,702 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-03 04:27:32,705 INFO L180 QuantifierPusher]: treesize reduction 13, result has 87.3 percent of original size [2021-11-03 04:27:32,706 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:27:32,708 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:27:32,709 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:27:32,710 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:27:32,711 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:27:32,711 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 88 [2021-11-03 04:27:32,713 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.4 percent of original size [2021-11-03 04:27:32,715 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 95 [2021-11-03 04:27:32,717 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:27:32,720 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:27:32,721 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:27:32,721 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:27:32,722 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:27:32,722 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:27:32,723 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:27:32,725 INFO L180 QuantifierPusher]: treesize reduction 24, result has 72.4 percent of original size [2021-11-03 04:27:32,727 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 42 [2021-11-03 04:27:32,730 INFO L180 QuantifierPusher]: treesize reduction 24, result has 68.0 percent of original size [2021-11-03 04:27:32,731 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:27:32,731 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:27:32,732 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 04:27:32,733 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 34 [2021-11-03 04:27:32,735 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:27:32,736 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 73 [2021-11-03 04:27:32,737 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:27:32,740 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:27:32,742 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:27:32,746 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:27:32,748 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 121 [2021-11-03 04:27:32,749 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:27:32,751 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 141 [2021-11-03 04:27:32,753 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:27:32,760 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:27:32,760 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:27:32,761 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:27:32,761 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:27:32,761 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:27:32,762 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:27:32,763 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:27:32,766 INFO L180 QuantifierPusher]: treesize reduction 24, result has 77.1 percent of original size [2021-11-03 04:27:32,767 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-03 04:27:32,769 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:27:32,772 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:27:32,772 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:27:32,773 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:27:32,773 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:27:32,774 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:27:32,776 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:27:32,778 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:27:32,782 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:27:32,784 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:27:32,785 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 04:27:34,208 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 04:27:34,209 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:27:34,209 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [102, 102, 102] total 154 [2021-11-03 04:27:34,209 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [835995048] [2021-11-03 04:27:34,210 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 154 states [2021-11-03 04:27:34,210 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:27:34,211 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 154 interpolants. [2021-11-03 04:27:34,212 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5435, Invalid=20971, Unknown=0, NotChecked=0, Total=26406 [2021-11-03 04:27:34,212 INFO L87 Difference]: Start difference. First operand 305 states and 307 transitions. Second operand has 154 states, 154 states have (on average 3.2987012987012987) internal successors, (508), 154 states have internal predecessors, (508), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:27:36,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:27:36,875 INFO L93 Difference]: Finished difference Result 660 states and 713 transitions. [2021-11-03 04:27:36,875 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 102 states. [2021-11-03 04:27:36,875 INFO L78 Accepts]: Start accepts. Automaton has has 154 states, 154 states have (on average 3.2987012987012987) internal successors, (508), 154 states have internal predecessors, (508), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 304 [2021-11-03 04:27:36,875 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:27:36,877 INFO L225 Difference]: With dead ends: 660 [2021-11-03 04:27:36,877 INFO L226 Difference]: Without dead ends: 457 [2021-11-03 04:27:36,880 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 1062 GetRequests, 851 SyntacticMatches, 0 SemanticMatches, 211 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10881 ImplicationChecksByTransitivity, 8.5s TimeCoverageRelationStatistics Valid=10537, Invalid=34619, Unknown=0, NotChecked=0, Total=45156 [2021-11-03 04:27:36,881 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 457 states. [2021-11-03 04:27:36,910 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 457 to 307. [2021-11-03 04:27:36,910 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 307 states, 306 states have (on average 1.0098039215686274) internal successors, (309), 306 states have internal predecessors, (309), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:27:36,911 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 307 states to 307 states and 309 transitions. [2021-11-03 04:27:36,911 INFO L78 Accepts]: Start accepts. Automaton has 307 states and 309 transitions. Word has length 304 [2021-11-03 04:27:36,912 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:27:36,912 INFO L470 AbstractCegarLoop]: Abstraction has 307 states and 309 transitions. [2021-11-03 04:27:36,912 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 154 states, 154 states have (on average 3.2987012987012987) internal successors, (508), 154 states have internal predecessors, (508), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:27:36,912 INFO L276 IsEmpty]: Start isEmpty. Operand 307 states and 309 transitions. [2021-11-03 04:27:36,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 307 [2021-11-03 04:27:36,914 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:27:36,915 INFO L513 BasicCegarLoop]: trace histogram [51, 50, 50, 49, 49, 49, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:27:36,981 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Forceful destruction successful, exit code 0 [2021-11-03 04:27:37,139 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1601,56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:27:37,140 INFO L402 AbstractCegarLoop]: === Iteration 59 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:27:37,140 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:27:37,140 INFO L85 PathProgramCache]: Analyzing trace with hash -1155327443, now seen corresponding path program 56 times [2021-11-03 04:27:37,140 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:27:37,140 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1474872151] [2021-11-03 04:27:37,140 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:27:37,140 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:27:37,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:27:38,503 INFO L134 CoverageAnalysis]: Checked inductivity of 7352 backedges. 2450 proven. 4902 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:27:38,503 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:27:38,503 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1474872151] [2021-11-03 04:27:38,503 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1474872151] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:27:38,503 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [347125079] [2021-11-03 04:27:38,503 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-03 04:27:38,504 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:27:38,504 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:27:38,504 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:27:38,505 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Waiting until timeout for monitored process [2021-11-03 04:27:45,016 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 51 check-sat command(s) [2021-11-03 04:27:45,016 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 04:27:45,024 INFO L263 TraceCheckSpWp]: Trace formula consists of 1139 conjuncts, 103 conjunts are in the unsatisfiable core [2021-11-03 04:27:45,027 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:27:45,804 INFO L134 CoverageAnalysis]: Checked inductivity of 7352 backedges. 2550 proven. 4802 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:27:45,804 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:27:46,631 INFO L134 CoverageAnalysis]: Checked inductivity of 7352 backedges. 2550 proven. 4802 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:27:46,631 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [347125079] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:27:46,632 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1619863182] [2021-11-03 04:27:46,632 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-03 04:27:46,632 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:27:46,633 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:27:46,633 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:27:46,633 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:27:46,638 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:27:46,638 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:27:46,638 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:27:46,639 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 04:27:46,639 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:27:46,639 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:27:46,640 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 04:27:46,640 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-03 04:27:46,660 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_63|], 10=[|v_#valid_64|]} [2021-11-03 04:27:46,666 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:27:46,667 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-03 04:27:46,667 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:27:46,668 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:27:46,668 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:27:46,668 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:27:46,669 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 04:27:46,669 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:27:46,671 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:27:46,674 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:27:46,675 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:27:46,676 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:27:46,680 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:27:46,681 INFO L388 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 23 treesize of output 22 [2021-11-03 04:27:46,682 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:27:46,683 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:27:46,684 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:27:46,684 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:27:46,685 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 04:27:46,685 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:27:46,687 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:27:46,688 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:27:46,689 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:27:46,690 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 04:27:46,690 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-03 04:27:46,695 INFO L180 QuantifierPusher]: treesize reduction 13, result has 87.3 percent of original size [2021-11-03 04:27:46,696 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:27:46,699 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:27:46,700 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:27:46,701 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:27:46,702 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:27:46,703 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 88 [2021-11-03 04:27:46,704 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.4 percent of original size [2021-11-03 04:27:46,707 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 04:27:46,709 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:27:46,713 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:27:46,713 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:27:46,714 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:27:46,715 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:27:46,715 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:27:46,716 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:27:46,719 INFO L180 QuantifierPusher]: treesize reduction 24, result has 72.4 percent of original size [2021-11-03 04:27:46,721 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 42 [2021-11-03 04:27:46,724 INFO L180 QuantifierPusher]: treesize reduction 24, result has 68.0 percent of original size [2021-11-03 04:27:46,725 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:27:46,726 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:27:46,727 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 04:27:46,728 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 34 [2021-11-03 04:27:46,730 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:27:46,731 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-03 04:27:46,733 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:27:46,736 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:27:46,738 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:27:46,744 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:27:46,746 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 121 [2021-11-03 04:27:46,747 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:27:46,749 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 141 [2021-11-03 04:27:46,752 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:27:46,764 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:27:46,765 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:27:46,765 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:27:46,766 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:27:46,767 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:27:46,768 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:27:46,770 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:27:46,775 INFO L180 QuantifierPusher]: treesize reduction 24, result has 77.1 percent of original size [2021-11-03 04:27:46,777 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-03 04:27:46,780 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:27:46,785 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:27:46,786 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:27:46,787 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:27:46,787 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:27:46,789 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:27:46,794 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:27:46,796 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:27:46,803 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:27:46,805 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:27:46,807 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 04:27:47,643 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 04:27:47,643 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:27:47,643 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 56 [2021-11-03 04:27:47,643 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [30061501] [2021-11-03 04:27:47,644 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 57 states [2021-11-03 04:27:47,644 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:27:47,644 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2021-11-03 04:27:47,645 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1486, Invalid=2804, Unknown=0, NotChecked=0, Total=4290 [2021-11-03 04:27:47,645 INFO L87 Difference]: Start difference. First operand 307 states and 309 transitions. Second operand has 57 states, 57 states have (on average 5.7368421052631575) internal successors, (327), 56 states have internal predecessors, (327), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:27:48,919 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:27:48,919 INFO L93 Difference]: Finished difference Result 324 states and 327 transitions. [2021-11-03 04:27:48,919 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 108 states. [2021-11-03 04:27:48,919 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 57 states have (on average 5.7368421052631575) internal successors, (327), 56 states have internal predecessors, (327), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 306 [2021-11-03 04:27:48,920 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:27:48,921 INFO L225 Difference]: With dead ends: 324 [2021-11-03 04:27:48,921 INFO L226 Difference]: Without dead ends: 322 [2021-11-03 04:27:48,922 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 1071 GetRequests, 953 SyntacticMatches, 1 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3864 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=4459, Invalid=9583, Unknown=0, NotChecked=0, Total=14042 [2021-11-03 04:27:48,923 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 322 states. [2021-11-03 04:27:48,951 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 322 to 315. [2021-11-03 04:27:48,951 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 315 states, 314 states have (on average 1.0095541401273886) internal successors, (317), 314 states have internal predecessors, (317), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:27:48,951 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 315 states to 315 states and 317 transitions. [2021-11-03 04:27:48,951 INFO L78 Accepts]: Start accepts. Automaton has 315 states and 317 transitions. Word has length 306 [2021-11-03 04:27:48,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:27:48,952 INFO L470 AbstractCegarLoop]: Abstraction has 315 states and 317 transitions. [2021-11-03 04:27:48,952 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 57 states, 57 states have (on average 5.7368421052631575) internal successors, (327), 56 states have internal predecessors, (327), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:27:48,952 INFO L276 IsEmpty]: Start isEmpty. Operand 315 states and 317 transitions. [2021-11-03 04:27:48,953 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 315 [2021-11-03 04:27:48,953 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:27:48,953 INFO L513 BasicCegarLoop]: trace histogram [52, 51, 51, 51, 51, 50, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:27:48,993 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Forceful destruction successful, exit code 0 [2021-11-03 04:27:49,154 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1628,57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:27:49,154 INFO L402 AbstractCegarLoop]: === Iteration 60 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:27:49,154 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:27:49,154 INFO L85 PathProgramCache]: Analyzing trace with hash -1791168749, now seen corresponding path program 57 times [2021-11-03 04:27:49,154 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:27:49,154 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1071770301] [2021-11-03 04:27:49,154 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:27:49,155 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:27:49,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:27:52,348 INFO L134 CoverageAnalysis]: Checked inductivity of 7752 backedges. 5052 proven. 2700 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:27:52,348 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:27:52,348 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1071770301] [2021-11-03 04:27:52,348 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1071770301] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:27:52,348 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [718723720] [2021-11-03 04:27:52,348 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-03 04:27:52,348 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:27:52,349 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:27:52,349 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:27:52,350 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Waiting until timeout for monitored process [2021-11-03 04:27:58,546 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-03 04:27:58,546 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 04:27:58,553 INFO L263 TraceCheckSpWp]: Trace formula consists of 1163 conjuncts, 105 conjunts are in the unsatisfiable core [2021-11-03 04:27:58,555 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:28:03,578 INFO L134 CoverageAnalysis]: Checked inductivity of 7752 backedges. 5202 proven. 2550 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:28:03,578 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:28:04,490 INFO L134 CoverageAnalysis]: Checked inductivity of 7752 backedges. 5202 proven. 2550 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:28:04,490 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [718723720] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:28:04,490 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2074451586] [2021-11-03 04:28:04,491 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-03 04:28:04,491 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:28:04,491 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:28:04,491 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:28:04,492 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:28:04,493 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:28:04,494 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:28:04,494 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:28:04,495 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 04:28:04,495 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:28:04,495 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:28:04,495 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 04:28:04,496 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-03 04:28:04,497 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_64|], 10=[|v_#valid_65|]} [2021-11-03 04:28:04,501 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:28:04,502 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-03 04:28:04,502 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:28:04,502 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:28:04,503 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:28:04,503 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:28:04,503 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 04:28:04,503 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:04,504 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:28:04,507 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:28:04,508 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:28:04,508 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:28:04,511 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:28:04,512 INFO L388 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 23 treesize of output 22 [2021-11-03 04:28:04,512 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:28:04,513 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:28:04,514 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:28:04,514 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:28:04,514 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 04:28:04,515 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:04,516 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:28:04,516 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:28:04,517 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:28:04,517 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 04:28:04,517 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-03 04:28:04,521 INFO L180 QuantifierPusher]: treesize reduction 13, result has 87.3 percent of original size [2021-11-03 04:28:04,522 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:28:04,524 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:28:04,526 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:28:04,526 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:28:04,527 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:28:04,528 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 88 [2021-11-03 04:28:04,530 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.4 percent of original size [2021-11-03 04:28:04,532 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 04:28:04,534 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:04,537 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:04,538 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:04,539 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:04,539 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:04,539 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:04,540 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:04,543 INFO L180 QuantifierPusher]: treesize reduction 24, result has 72.4 percent of original size [2021-11-03 04:28:04,545 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 42 [2021-11-03 04:28:04,548 INFO L180 QuantifierPusher]: treesize reduction 24, result has 68.0 percent of original size [2021-11-03 04:28:04,548 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:28:04,549 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:28:04,550 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 04:28:04,550 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 34 [2021-11-03 04:28:04,552 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:28:04,554 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 75 [2021-11-03 04:28:04,555 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:04,557 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:04,560 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:04,564 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:28:04,566 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 132 [2021-11-03 04:28:04,568 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:28:04,570 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 152 [2021-11-03 04:28:04,572 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:04,578 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:04,579 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:04,579 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:04,580 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:04,580 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:04,581 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:04,582 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:04,585 INFO L180 QuantifierPusher]: treesize reduction 24, result has 77.1 percent of original size [2021-11-03 04:28:04,586 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-03 04:28:04,587 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:04,590 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:04,591 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:04,591 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:04,592 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:04,593 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:04,595 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:28:04,597 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:28:04,601 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:28:04,602 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:28:04,604 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 04:28:05,902 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 04:28:05,902 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:28:05,902 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [105, 105, 105] total 161 [2021-11-03 04:28:05,902 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1006617742] [2021-11-03 04:28:05,903 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 161 states [2021-11-03 04:28:05,903 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:28:05,904 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 161 interpolants. [2021-11-03 04:28:05,906 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5966, Invalid=22764, Unknown=0, NotChecked=0, Total=28730 [2021-11-03 04:28:05,906 INFO L87 Difference]: Start difference. First operand 315 states and 317 transitions. Second operand has 161 states, 161 states have (on average 3.3229813664596275) internal successors, (535), 161 states have internal predecessors, (535), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:28:11,087 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:28:11,087 INFO L93 Difference]: Finished difference Result 889 states and 945 transitions. [2021-11-03 04:28:11,087 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 157 states. [2021-11-03 04:28:11,087 INFO L78 Accepts]: Start accepts. Automaton has has 161 states, 161 states have (on average 3.3229813664596275) internal successors, (535), 161 states have internal predecessors, (535), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 314 [2021-11-03 04:28:11,087 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:28:11,089 INFO L225 Difference]: With dead ends: 889 [2021-11-03 04:28:11,089 INFO L226 Difference]: Without dead ends: 475 [2021-11-03 04:28:11,097 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 1148 GetRequests, 877 SyntacticMatches, 0 SemanticMatches, 271 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18924 ImplicationChecksByTransitivity, 10.4s TimeCoverageRelationStatistics Valid=16937, Invalid=57319, Unknown=0, NotChecked=0, Total=74256 [2021-11-03 04:28:11,098 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 475 states. [2021-11-03 04:28:11,128 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 475 to 319. [2021-11-03 04:28:11,129 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 319 states, 318 states have (on average 1.009433962264151) internal successors, (321), 318 states have internal predecessors, (321), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:28:11,129 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 319 states to 319 states and 321 transitions. [2021-11-03 04:28:11,129 INFO L78 Accepts]: Start accepts. Automaton has 319 states and 321 transitions. Word has length 314 [2021-11-03 04:28:11,129 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:28:11,129 INFO L470 AbstractCegarLoop]: Abstraction has 319 states and 321 transitions. [2021-11-03 04:28:11,129 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 161 states, 161 states have (on average 3.3229813664596275) internal successors, (535), 161 states have internal predecessors, (535), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:28:11,129 INFO L276 IsEmpty]: Start isEmpty. Operand 319 states and 321 transitions. [2021-11-03 04:28:11,131 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 319 [2021-11-03 04:28:11,131 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:28:11,131 INFO L513 BasicCegarLoop]: trace histogram [53, 52, 52, 51, 51, 51, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:28:11,174 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Forceful destruction successful, exit code 0 [2021-11-03 04:28:11,339 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1655 [2021-11-03 04:28:11,340 INFO L402 AbstractCegarLoop]: === Iteration 61 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:28:11,340 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:28:11,340 INFO L85 PathProgramCache]: Analyzing trace with hash -1178209251, now seen corresponding path program 58 times [2021-11-03 04:28:11,340 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:28:11,340 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [678101968] [2021-11-03 04:28:11,340 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:28:11,340 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:28:11,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:28:12,768 INFO L134 CoverageAnalysis]: Checked inductivity of 7958 backedges. 2652 proven. 5306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:28:12,768 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:28:12,768 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [678101968] [2021-11-03 04:28:12,768 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [678101968] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:28:12,768 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1101487375] [2021-11-03 04:28:12,768 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-03 04:28:12,769 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:28:12,769 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:28:12,769 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:28:12,770 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Waiting until timeout for monitored process [2021-11-03 04:28:19,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:28:19,623 INFO L263 TraceCheckSpWp]: Trace formula consists of 1183 conjuncts, 107 conjunts are in the unsatisfiable core [2021-11-03 04:28:19,626 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:28:20,412 INFO L134 CoverageAnalysis]: Checked inductivity of 7958 backedges. 2756 proven. 5202 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:28:20,413 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:28:21,284 INFO L134 CoverageAnalysis]: Checked inductivity of 7958 backedges. 2756 proven. 5202 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:28:21,284 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1101487375] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:28:21,284 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1240256840] [2021-11-03 04:28:21,286 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-03 04:28:21,286 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:28:21,286 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:28:21,287 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:28:21,287 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:28:21,301 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:28:21,301 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:28:21,302 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:28:21,302 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 04:28:21,303 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:28:21,303 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:28:21,304 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 04:28:21,305 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-03 04:28:21,307 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_65|], 10=[|v_#valid_66|]} [2021-11-03 04:28:21,314 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:28:21,315 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-03 04:28:21,315 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:28:21,316 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:28:21,316 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:28:21,317 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:28:21,317 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 04:28:21,317 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:21,320 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:28:21,323 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:28:21,324 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:28:21,325 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:28:21,329 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:28:21,330 INFO L388 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 23 treesize of output 22 [2021-11-03 04:28:21,331 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:28:21,333 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:28:21,333 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:28:21,334 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:28:21,334 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 04:28:21,334 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:21,337 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:28:21,338 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:28:21,339 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:28:21,339 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 04:28:21,339 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-03 04:28:21,344 INFO L180 QuantifierPusher]: treesize reduction 13, result has 87.3 percent of original size [2021-11-03 04:28:21,346 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:28:21,349 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:28:21,351 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:28:21,351 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:28:21,353 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:28:21,354 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 88 [2021-11-03 04:28:21,356 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.4 percent of original size [2021-11-03 04:28:21,358 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 95 [2021-11-03 04:28:21,360 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:21,363 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:21,364 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:21,366 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:21,366 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:21,367 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:21,368 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:21,370 INFO L180 QuantifierPusher]: treesize reduction 24, result has 72.4 percent of original size [2021-11-03 04:28:21,372 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 42 [2021-11-03 04:28:21,375 INFO L180 QuantifierPusher]: treesize reduction 24, result has 68.0 percent of original size [2021-11-03 04:28:21,375 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:28:21,376 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:28:21,377 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 04:28:21,377 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 34 [2021-11-03 04:28:21,379 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:28:21,380 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 73 [2021-11-03 04:28:21,382 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:21,384 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:21,386 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:21,390 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:28:21,392 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 121 [2021-11-03 04:28:21,393 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:28:21,395 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 141 [2021-11-03 04:28:21,397 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:21,403 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:21,404 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:21,404 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:21,404 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:21,405 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:21,406 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:21,408 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:21,410 INFO L180 QuantifierPusher]: treesize reduction 24, result has 77.1 percent of original size [2021-11-03 04:28:21,412 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-03 04:28:21,413 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:21,416 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:21,417 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:21,417 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:21,418 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:21,423 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:21,425 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:28:21,427 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:28:21,431 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:28:21,432 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:28:21,433 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 04:28:22,327 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 04:28:22,327 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:28:22,327 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 55, 55] total 58 [2021-11-03 04:28:22,327 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [843846893] [2021-11-03 04:28:22,328 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2021-11-03 04:28:22,328 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:28:22,328 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2021-11-03 04:28:22,329 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1595, Invalid=2961, Unknown=0, NotChecked=0, Total=4556 [2021-11-03 04:28:22,329 INFO L87 Difference]: Start difference. First operand 319 states and 321 transitions. Second operand has 59 states, 59 states have (on average 5.745762711864407) internal successors, (339), 58 states have internal predecessors, (339), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:28:23,685 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:28:23,686 INFO L93 Difference]: Finished difference Result 336 states and 339 transitions. [2021-11-03 04:28:23,686 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 112 states. [2021-11-03 04:28:23,686 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 5.745762711864407) internal successors, (339), 58 states have internal predecessors, (339), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 318 [2021-11-03 04:28:23,686 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:28:23,688 INFO L225 Difference]: With dead ends: 336 [2021-11-03 04:28:23,688 INFO L226 Difference]: Without dead ends: 334 [2021-11-03 04:28:23,689 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 1113 GetRequests, 991 SyntacticMatches, 1 SemanticMatches, 121 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4120 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=4790, Invalid=10216, Unknown=0, NotChecked=0, Total=15006 [2021-11-03 04:28:23,689 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 334 states. [2021-11-03 04:28:23,717 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 334 to 327. [2021-11-03 04:28:23,718 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 327 states, 326 states have (on average 1.00920245398773) internal successors, (329), 326 states have internal predecessors, (329), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:28:23,718 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 327 states to 327 states and 329 transitions. [2021-11-03 04:28:23,718 INFO L78 Accepts]: Start accepts. Automaton has 327 states and 329 transitions. Word has length 318 [2021-11-03 04:28:23,719 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:28:23,719 INFO L470 AbstractCegarLoop]: Abstraction has 327 states and 329 transitions. [2021-11-03 04:28:23,719 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 59 states, 59 states have (on average 5.745762711864407) internal successors, (339), 58 states have internal predecessors, (339), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:28:23,719 INFO L276 IsEmpty]: Start isEmpty. Operand 327 states and 329 transitions. [2021-11-03 04:28:23,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 327 [2021-11-03 04:28:23,720 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:28:23,720 INFO L513 BasicCegarLoop]: trace histogram [54, 53, 53, 53, 53, 52, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:28:23,761 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Forceful destruction successful, exit code 0 [2021-11-03 04:28:23,920 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 59 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1682 [2021-11-03 04:28:23,921 INFO L402 AbstractCegarLoop]: === Iteration 62 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:28:23,921 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:28:23,921 INFO L85 PathProgramCache]: Analyzing trace with hash -736175869, now seen corresponding path program 59 times [2021-11-03 04:28:23,921 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:28:23,922 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [733494105] [2021-11-03 04:28:23,922 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:28:23,922 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:28:24,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:28:27,508 INFO L134 CoverageAnalysis]: Checked inductivity of 8374 backedges. 5462 proven. 2912 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:28:27,508 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:28:27,508 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [733494105] [2021-11-03 04:28:27,508 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [733494105] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:28:27,509 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [172334740] [2021-11-03 04:28:27,509 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-03 04:28:27,509 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:28:27,509 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:28:27,510 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:28:27,510 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Waiting until timeout for monitored process [2021-11-03 04:28:34,711 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 54 check-sat command(s) [2021-11-03 04:28:34,711 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 04:28:34,720 INFO L263 TraceCheckSpWp]: Trace formula consists of 1207 conjuncts, 109 conjunts are in the unsatisfiable core [2021-11-03 04:28:34,723 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:28:39,987 INFO L134 CoverageAnalysis]: Checked inductivity of 8374 backedges. 5618 proven. 2756 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:28:39,987 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:28:40,947 INFO L134 CoverageAnalysis]: Checked inductivity of 8374 backedges. 5618 proven. 2756 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:28:40,947 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [172334740] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:28:40,947 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [470793655] [2021-11-03 04:28:40,948 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-03 04:28:40,948 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:28:40,948 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:28:40,948 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:28:40,949 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:28:40,960 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:28:40,960 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:28:40,961 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:28:40,961 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 04:28:40,961 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:28:40,962 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:28:40,962 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 04:28:40,963 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-03 04:28:40,965 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_66|], 10=[|v_#valid_67|]} [2021-11-03 04:28:40,969 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:28:40,969 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-03 04:28:40,970 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:28:40,970 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:28:40,970 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:28:40,970 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:28:40,971 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 04:28:40,971 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:40,972 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:28:40,974 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:28:40,975 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:28:40,976 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:28:40,978 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:28:40,979 INFO L388 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 23 treesize of output 22 [2021-11-03 04:28:40,979 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:28:40,980 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:28:40,981 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:28:40,981 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:28:40,981 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 04:28:40,982 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:40,983 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:28:40,983 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:28:40,984 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:28:40,984 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 04:28:40,984 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-03 04:28:40,988 INFO L180 QuantifierPusher]: treesize reduction 13, result has 87.3 percent of original size [2021-11-03 04:28:40,989 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:28:40,991 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:28:40,992 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:28:40,992 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:28:40,993 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:28:41,004 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 88 [2021-11-03 04:28:41,007 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.4 percent of original size [2021-11-03 04:28:41,010 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 04:28:41,012 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:41,018 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:41,019 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:41,019 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:41,020 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:41,021 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:41,022 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:41,025 INFO L180 QuantifierPusher]: treesize reduction 24, result has 72.4 percent of original size [2021-11-03 04:28:41,028 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 42 [2021-11-03 04:28:41,032 INFO L180 QuantifierPusher]: treesize reduction 24, result has 68.0 percent of original size [2021-11-03 04:28:41,033 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:28:41,034 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:28:41,035 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 04:28:41,036 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 34 [2021-11-03 04:28:41,039 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:28:41,041 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 75 [2021-11-03 04:28:41,043 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:41,046 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:41,050 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:41,057 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:28:41,060 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 132 [2021-11-03 04:28:41,062 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:28:41,065 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 152 [2021-11-03 04:28:41,068 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:41,079 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:41,080 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:41,080 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:41,081 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:41,082 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:41,082 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:41,084 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:41,086 INFO L180 QuantifierPusher]: treesize reduction 24, result has 77.1 percent of original size [2021-11-03 04:28:41,088 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-03 04:28:41,092 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:41,095 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:41,096 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:41,096 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:41,097 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:41,099 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:41,102 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:28:41,104 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:28:41,108 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:28:41,110 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:28:41,111 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 04:28:42,541 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 04:28:42,541 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:28:42,542 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [109, 109, 109] total 167 [2021-11-03 04:28:42,542 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1881728489] [2021-11-03 04:28:42,543 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 167 states [2021-11-03 04:28:42,543 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:28:42,544 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 167 interpolants. [2021-11-03 04:28:42,545 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6410, Invalid=24390, Unknown=0, NotChecked=0, Total=30800 [2021-11-03 04:28:42,545 INFO L87 Difference]: Start difference. First operand 327 states and 329 transitions. Second operand has 167 states, 167 states have (on average 3.3233532934131738) internal successors, (555), 167 states have internal predecessors, (555), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:28:48,082 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:28:48,082 INFO L93 Difference]: Finished difference Result 923 states and 981 transitions. [2021-11-03 04:28:48,082 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 163 states. [2021-11-03 04:28:48,082 INFO L78 Accepts]: Start accepts. Automaton has has 167 states, 167 states have (on average 3.3233532934131738) internal successors, (555), 167 states have internal predecessors, (555), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 326 [2021-11-03 04:28:48,083 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:28:48,084 INFO L225 Difference]: With dead ends: 923 [2021-11-03 04:28:48,084 INFO L226 Difference]: Without dead ends: 493 [2021-11-03 04:28:48,088 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 1192 GetRequests, 911 SyntacticMatches, 0 SemanticMatches, 281 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20300 ImplicationChecksByTransitivity, 11.6s TimeCoverageRelationStatistics Valid=18235, Invalid=61571, Unknown=0, NotChecked=0, Total=79806 [2021-11-03 04:28:48,088 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 493 states. [2021-11-03 04:28:48,117 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 493 to 331. [2021-11-03 04:28:48,117 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 331 states, 330 states have (on average 1.009090909090909) internal successors, (333), 330 states have internal predecessors, (333), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:28:48,118 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 331 states to 331 states and 333 transitions. [2021-11-03 04:28:48,118 INFO L78 Accepts]: Start accepts. Automaton has 331 states and 333 transitions. Word has length 326 [2021-11-03 04:28:48,118 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:28:48,118 INFO L470 AbstractCegarLoop]: Abstraction has 331 states and 333 transitions. [2021-11-03 04:28:48,118 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 167 states, 167 states have (on average 3.3233532934131738) internal successors, (555), 167 states have internal predecessors, (555), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:28:48,118 INFO L276 IsEmpty]: Start isEmpty. Operand 331 states and 333 transitions. [2021-11-03 04:28:48,120 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 331 [2021-11-03 04:28:48,120 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:28:48,120 INFO L513 BasicCegarLoop]: trace histogram [55, 54, 54, 53, 53, 53, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:28:48,166 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Forceful destruction successful, exit code 0 [2021-11-03 04:28:48,320 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 60 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1709 [2021-11-03 04:28:48,321 INFO L402 AbstractCegarLoop]: === Iteration 63 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:28:48,321 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:28:48,321 INFO L85 PathProgramCache]: Analyzing trace with hash 1399234317, now seen corresponding path program 60 times [2021-11-03 04:28:48,321 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:28:48,321 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1650893678] [2021-11-03 04:28:48,321 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:28:48,321 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:28:48,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:28:49,761 INFO L134 CoverageAnalysis]: Checked inductivity of 8588 backedges. 2862 proven. 5726 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:28:49,762 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:28:49,762 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1650893678] [2021-11-03 04:28:49,762 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1650893678] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:28:49,762 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1327598683] [2021-11-03 04:28:49,762 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-03 04:28:49,762 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:28:49,762 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:28:49,763 INFO L229 MonitoredProcess]: Starting monitored process 61 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:28:49,765 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Waiting until timeout for monitored process [2021-11-03 04:28:57,056 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-03 04:28:57,056 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 04:28:57,063 INFO L263 TraceCheckSpWp]: Trace formula consists of 1227 conjuncts, 111 conjunts are in the unsatisfiable core [2021-11-03 04:28:57,066 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:28:57,968 INFO L134 CoverageAnalysis]: Checked inductivity of 8588 backedges. 2970 proven. 5618 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:28:57,968 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:28:58,898 INFO L134 CoverageAnalysis]: Checked inductivity of 8588 backedges. 2970 proven. 5618 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:28:58,898 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1327598683] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:28:58,898 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [606291058] [2021-11-03 04:28:58,899 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-03 04:28:58,900 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:28:58,900 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:28:58,900 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:28:58,900 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:28:58,903 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:28:58,903 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:28:58,903 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:28:58,904 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 04:28:58,904 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:28:58,904 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:28:58,905 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 04:28:58,905 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-03 04:28:58,907 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_67|], 10=[|v_#valid_68|]} [2021-11-03 04:28:58,911 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:28:58,912 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-03 04:28:58,912 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:28:58,913 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:28:58,913 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:28:58,913 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:28:58,913 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 04:28:58,914 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:58,915 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:28:58,918 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:28:58,919 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:28:58,919 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:28:58,922 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:28:58,923 INFO L388 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 23 treesize of output 22 [2021-11-03 04:28:58,924 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:28:58,925 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:28:58,925 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:28:58,926 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:28:58,926 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 04:28:58,926 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:58,927 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:28:58,928 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:28:58,929 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:28:58,929 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 04:28:58,929 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-03 04:28:58,933 INFO L180 QuantifierPusher]: treesize reduction 13, result has 87.3 percent of original size [2021-11-03 04:28:58,934 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:28:58,936 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:28:58,938 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:28:58,938 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:28:58,939 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:28:58,940 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 88 [2021-11-03 04:28:58,942 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.4 percent of original size [2021-11-03 04:28:58,944 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 97 [2021-11-03 04:28:58,946 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:58,950 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:58,951 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:58,951 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:58,952 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:58,952 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:58,953 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:58,956 INFO L180 QuantifierPusher]: treesize reduction 24, result has 72.4 percent of original size [2021-11-03 04:28:58,958 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 42 [2021-11-03 04:28:58,961 INFO L180 QuantifierPusher]: treesize reduction 24, result has 68.0 percent of original size [2021-11-03 04:28:58,962 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:28:58,963 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:28:58,964 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 04:28:58,964 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 34 [2021-11-03 04:28:58,966 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:28:58,968 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 73 [2021-11-03 04:28:58,969 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:58,972 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:58,974 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:58,986 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:28:58,989 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 132 [2021-11-03 04:28:58,992 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:28:58,995 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 152 [2021-11-03 04:28:58,998 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:59,008 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:59,009 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:59,010 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:59,010 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:59,011 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:59,011 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:59,014 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:59,017 INFO L180 QuantifierPusher]: treesize reduction 24, result has 77.1 percent of original size [2021-11-03 04:28:59,019 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-03 04:28:59,020 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:59,024 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:59,024 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:59,025 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:59,025 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:59,026 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:28:59,029 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:28:59,031 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:28:59,036 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:28:59,038 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:28:59,039 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 04:28:59,949 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 04:28:59,949 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:28:59,950 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 57, 57] total 60 [2021-11-03 04:28:59,950 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2081506535] [2021-11-03 04:28:59,950 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 61 states [2021-11-03 04:28:59,951 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:28:59,951 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2021-11-03 04:28:59,951 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1708, Invalid=3122, Unknown=0, NotChecked=0, Total=4830 [2021-11-03 04:28:59,951 INFO L87 Difference]: Start difference. First operand 331 states and 333 transitions. Second operand has 61 states, 61 states have (on average 5.754098360655738) internal successors, (351), 60 states have internal predecessors, (351), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:29:01,354 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:29:01,354 INFO L93 Difference]: Finished difference Result 348 states and 351 transitions. [2021-11-03 04:29:01,355 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 116 states. [2021-11-03 04:29:01,355 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 61 states have (on average 5.754098360655738) internal successors, (351), 60 states have internal predecessors, (351), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 330 [2021-11-03 04:29:01,355 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:29:01,357 INFO L225 Difference]: With dead ends: 348 [2021-11-03 04:29:01,357 INFO L226 Difference]: Without dead ends: 346 [2021-11-03 04:29:01,358 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 1155 GetRequests, 1029 SyntacticMatches, 1 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4384 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=5133, Invalid=10869, Unknown=0, NotChecked=0, Total=16002 [2021-11-03 04:29:01,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 346 states. [2021-11-03 04:29:01,409 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 346 to 339. [2021-11-03 04:29:01,409 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 339 states, 338 states have (on average 1.0088757396449703) internal successors, (341), 338 states have internal predecessors, (341), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:29:01,410 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 339 states to 339 states and 341 transitions. [2021-11-03 04:29:01,410 INFO L78 Accepts]: Start accepts. Automaton has 339 states and 341 transitions. Word has length 330 [2021-11-03 04:29:01,410 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:29:01,410 INFO L470 AbstractCegarLoop]: Abstraction has 339 states and 341 transitions. [2021-11-03 04:29:01,410 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 61 states, 61 states have (on average 5.754098360655738) internal successors, (351), 60 states have internal predecessors, (351), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:29:01,410 INFO L276 IsEmpty]: Start isEmpty. Operand 339 states and 341 transitions. [2021-11-03 04:29:01,412 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 339 [2021-11-03 04:29:01,412 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:29:01,412 INFO L513 BasicCegarLoop]: trace histogram [56, 55, 55, 55, 55, 54, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:29:01,461 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Ended with exit code 0 [2021-11-03 04:29:01,615 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1736,61 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:29:01,616 INFO L402 AbstractCegarLoop]: === Iteration 64 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:29:01,616 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:29:01,616 INFO L85 PathProgramCache]: Analyzing trace with hash 1067291635, now seen corresponding path program 61 times [2021-11-03 04:29:01,616 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:29:01,616 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1481588962] [2021-11-03 04:29:01,616 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:29:01,616 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:29:01,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:29:05,575 INFO L134 CoverageAnalysis]: Checked inductivity of 9020 backedges. 5888 proven. 3132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:29:05,575 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:29:05,575 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1481588962] [2021-11-03 04:29:05,575 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1481588962] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:29:05,575 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [255991948] [2021-11-03 04:29:05,575 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-03 04:29:05,575 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:29:05,576 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:29:05,576 INFO L229 MonitoredProcess]: Starting monitored process 62 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:29:05,577 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Waiting until timeout for monitored process [2021-11-03 04:29:12,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:29:12,777 INFO L263 TraceCheckSpWp]: Trace formula consists of 1251 conjuncts, 112 conjunts are in the unsatisfiable core [2021-11-03 04:29:12,779 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:29:18,206 INFO L134 CoverageAnalysis]: Checked inductivity of 9020 backedges. 6048 proven. 2970 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-03 04:29:18,206 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:29:19,087 INFO L134 CoverageAnalysis]: Checked inductivity of 9020 backedges. 6048 proven. 2970 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-03 04:29:19,087 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [255991948] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:29:19,087 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1908140673] [2021-11-03 04:29:19,088 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-03 04:29:19,088 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:29:19,088 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:29:19,088 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:29:19,088 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:29:19,090 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:29:19,091 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:29:19,091 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:29:19,091 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 04:29:19,092 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:29:19,092 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:29:19,092 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 04:29:19,093 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-03 04:29:19,094 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_68|], 10=[|v_#valid_69|]} [2021-11-03 04:29:19,099 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:29:19,100 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-03 04:29:19,100 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:29:19,100 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:29:19,101 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:29:19,101 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:29:19,101 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 04:29:19,101 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:29:19,103 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:29:19,105 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:29:19,106 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:29:19,107 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:29:19,110 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:29:19,110 INFO L388 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 23 treesize of output 22 [2021-11-03 04:29:19,111 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:29:19,112 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:29:19,112 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:29:19,113 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:29:19,113 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 04:29:19,113 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:29:19,115 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:29:19,115 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:29:19,116 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:29:19,116 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 04:29:19,116 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-03 04:29:19,120 INFO L180 QuantifierPusher]: treesize reduction 13, result has 87.3 percent of original size [2021-11-03 04:29:19,121 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:29:19,123 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:29:19,125 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:29:19,125 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:29:19,126 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:29:19,127 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 88 [2021-11-03 04:29:19,129 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.4 percent of original size [2021-11-03 04:29:19,131 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 97 [2021-11-03 04:29:19,133 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:29:19,137 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:29:19,138 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:29:19,138 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:29:19,139 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:29:19,139 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:29:19,141 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:29:19,143 INFO L180 QuantifierPusher]: treesize reduction 24, result has 72.4 percent of original size [2021-11-03 04:29:19,145 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 42 [2021-11-03 04:29:19,149 INFO L180 QuantifierPusher]: treesize reduction 24, result has 68.0 percent of original size [2021-11-03 04:29:19,149 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:29:19,150 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:29:19,151 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 04:29:19,152 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 34 [2021-11-03 04:29:19,154 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:29:19,155 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 75 [2021-11-03 04:29:19,158 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:29:19,161 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:29:19,163 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:29:19,168 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:29:19,170 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 132 [2021-11-03 04:29:19,172 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:29:19,185 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 152 [2021-11-03 04:29:19,188 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:29:19,196 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:29:19,196 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:29:19,197 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:29:19,197 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:29:19,198 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:29:19,198 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:29:19,200 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:29:19,203 INFO L180 QuantifierPusher]: treesize reduction 24, result has 77.1 percent of original size [2021-11-03 04:29:19,204 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-03 04:29:19,206 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:29:19,209 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:29:19,212 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:29:19,212 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:29:19,213 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:29:19,214 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:29:19,216 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:29:19,218 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:29:19,223 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:29:19,225 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:29:19,226 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 04:29:20,603 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 04:29:20,603 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:29:20,603 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [113, 112, 112] total 170 [2021-11-03 04:29:20,603 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [522965321] [2021-11-03 04:29:20,604 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 170 states [2021-11-03 04:29:20,604 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:29:20,605 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 170 interpolants. [2021-11-03 04:29:20,606 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6582, Invalid=25280, Unknown=0, NotChecked=0, Total=31862 [2021-11-03 04:29:20,607 INFO L87 Difference]: Start difference. First operand 339 states and 341 transitions. Second operand has 170 states, 170 states have (on average 3.3294117647058825) internal successors, (566), 170 states have internal predecessors, (566), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:29:23,879 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:29:23,879 INFO L93 Difference]: Finished difference Result 731 states and 789 transitions. [2021-11-03 04:29:23,879 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 112 states. [2021-11-03 04:29:23,880 INFO L78 Accepts]: Start accepts. Automaton has has 170 states, 170 states have (on average 3.3294117647058825) internal successors, (566), 170 states have internal predecessors, (566), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 338 [2021-11-03 04:29:23,880 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:29:23,882 INFO L225 Difference]: With dead ends: 731 [2021-11-03 04:29:23,882 INFO L226 Difference]: Without dead ends: 506 [2021-11-03 04:29:23,885 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 1180 GetRequests, 948 SyntacticMatches, 0 SemanticMatches, 232 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13105 ImplicationChecksByTransitivity, 10.3s TimeCoverageRelationStatistics Valid=12744, Invalid=41778, Unknown=0, NotChecked=0, Total=54522 [2021-11-03 04:29:23,885 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 506 states. [2021-11-03 04:29:23,919 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 506 to 341. [2021-11-03 04:29:23,919 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 341 states, 340 states have (on average 1.0088235294117647) internal successors, (343), 340 states have internal predecessors, (343), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:29:23,920 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 341 states to 341 states and 343 transitions. [2021-11-03 04:29:23,920 INFO L78 Accepts]: Start accepts. Automaton has 341 states and 343 transitions. Word has length 338 [2021-11-03 04:29:23,920 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:29:23,920 INFO L470 AbstractCegarLoop]: Abstraction has 341 states and 343 transitions. [2021-11-03 04:29:23,921 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 170 states, 170 states have (on average 3.3294117647058825) internal successors, (566), 170 states have internal predecessors, (566), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:29:23,921 INFO L276 IsEmpty]: Start isEmpty. Operand 341 states and 343 transitions. [2021-11-03 04:29:23,922 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 341 [2021-11-03 04:29:23,923 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:29:23,923 INFO L513 BasicCegarLoop]: trace histogram [56, 56, 55, 55, 55, 55, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:29:23,968 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Forceful destruction successful, exit code 0 [2021-11-03 04:29:24,127 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1763,62 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:29:24,128 INFO L402 AbstractCegarLoop]: === Iteration 65 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:29:24,128 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:29:24,128 INFO L85 PathProgramCache]: Analyzing trace with hash 1029149208, now seen corresponding path program 62 times [2021-11-03 04:29:24,128 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:29:24,128 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [751091493] [2021-11-03 04:29:24,128 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:29:24,129 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:29:24,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:29:28,091 INFO L134 CoverageAnalysis]: Checked inductivity of 9130 backedges. 5888 proven. 3242 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:29:28,091 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:29:28,091 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [751091493] [2021-11-03 04:29:28,091 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [751091493] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:29:28,091 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [883964991] [2021-11-03 04:29:28,091 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-03 04:29:28,091 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:29:28,092 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:29:28,093 INFO L229 MonitoredProcess]: Starting monitored process 63 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:29:28,098 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Waiting until timeout for monitored process [2021-11-03 04:29:35,749 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 56 check-sat command(s) [2021-11-03 04:29:35,749 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 04:29:35,757 INFO L263 TraceCheckSpWp]: Trace formula consists of 1261 conjuncts, 114 conjunts are in the unsatisfiable core [2021-11-03 04:29:35,760 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:29:39,871 INFO L134 CoverageAnalysis]: Checked inductivity of 9130 backedges. 3080 proven. 6050 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:29:39,871 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:29:40,792 INFO L134 CoverageAnalysis]: Checked inductivity of 9130 backedges. 3080 proven. 6050 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:29:40,792 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [883964991] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:29:40,792 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1513577320] [2021-11-03 04:29:40,793 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-03 04:29:40,793 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:29:40,793 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:29:40,793 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:29:40,793 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:29:40,795 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:29:40,796 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:29:40,796 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:29:40,796 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 04:29:40,796 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:29:40,797 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:29:40,797 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 04:29:40,798 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-03 04:29:40,799 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_69|], 10=[|v_#valid_70|]} [2021-11-03 04:29:40,804 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:29:40,804 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-03 04:29:40,805 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:29:40,805 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:29:40,805 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:29:40,806 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:29:40,806 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 04:29:40,806 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:29:40,813 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:29:40,815 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:29:40,816 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:29:40,817 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:29:40,820 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:29:40,820 INFO L388 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 23 treesize of output 22 [2021-11-03 04:29:40,821 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:29:40,822 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:29:40,822 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:29:40,822 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:29:40,823 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 04:29:40,823 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:29:40,825 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:29:40,825 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:29:40,826 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:29:40,826 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 04:29:40,826 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-03 04:29:40,830 INFO L180 QuantifierPusher]: treesize reduction 13, result has 87.3 percent of original size [2021-11-03 04:29:40,831 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:29:40,833 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:29:40,834 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:29:40,835 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:29:40,836 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:29:40,837 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 88 [2021-11-03 04:29:40,838 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.4 percent of original size [2021-11-03 04:29:40,841 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 97 [2021-11-03 04:29:40,842 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:29:40,846 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:29:40,847 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:29:40,847 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:29:40,848 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:29:40,848 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:29:40,850 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:29:40,852 INFO L180 QuantifierPusher]: treesize reduction 24, result has 72.4 percent of original size [2021-11-03 04:29:40,854 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 42 [2021-11-03 04:29:40,857 INFO L180 QuantifierPusher]: treesize reduction 24, result has 68.0 percent of original size [2021-11-03 04:29:40,858 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:29:40,859 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:29:40,860 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 04:29:40,860 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 34 [2021-11-03 04:29:40,862 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:29:40,863 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 73 [2021-11-03 04:29:40,865 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:29:40,867 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:29:40,870 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:29:40,875 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:29:40,877 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 121 [2021-11-03 04:29:40,878 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:29:40,880 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 141 [2021-11-03 04:29:40,882 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:29:40,889 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:29:40,890 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:29:40,890 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:29:40,891 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:29:40,891 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:29:40,892 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:29:40,893 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:29:40,896 INFO L180 QuantifierPusher]: treesize reduction 24, result has 77.1 percent of original size [2021-11-03 04:29:40,898 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-03 04:29:40,899 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:29:40,903 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:29:40,903 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:29:40,904 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:29:40,904 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:29:40,905 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:29:40,908 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:29:40,910 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:29:40,914 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:29:40,916 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:29:40,917 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 04:29:42,321 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 04:29:42,321 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:29:42,321 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [114, 58, 58] total 171 [2021-11-03 04:29:42,322 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1459370761] [2021-11-03 04:29:42,322 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 171 states [2021-11-03 04:29:42,322 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:29:42,323 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 171 interpolants. [2021-11-03 04:29:42,325 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5049, Invalid=27171, Unknown=0, NotChecked=0, Total=32220 [2021-11-03 04:29:42,325 INFO L87 Difference]: Start difference. First operand 341 states and 343 transitions. Second operand has 171 states, 171 states have (on average 3.9707602339181287) internal successors, (679), 171 states have internal predecessors, (679), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:29:51,775 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:29:51,775 INFO L93 Difference]: Finished difference Result 745 states and 805 transitions. [2021-11-03 04:29:51,776 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 229 states. [2021-11-03 04:29:51,776 INFO L78 Accepts]: Start accepts. Automaton has has 171 states, 171 states have (on average 3.9707602339181287) internal successors, (679), 171 states have internal predecessors, (679), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 340 [2021-11-03 04:29:51,776 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:29:51,778 INFO L225 Difference]: With dead ends: 745 [2021-11-03 04:29:51,778 INFO L226 Difference]: Without dead ends: 518 [2021-11-03 04:29:51,788 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 1412 GetRequests, 1009 SyntacticMatches, 1 SemanticMatches, 402 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56736 ImplicationChecksByTransitivity, 14.5s TimeCoverageRelationStatistics Valid=24764, Invalid=138048, Unknown=0, NotChecked=0, Total=162812 [2021-11-03 04:29:51,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 518 states. [2021-11-03 04:29:51,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 518 to 347. [2021-11-03 04:29:51,825 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 347 states, 346 states have (on average 1.0086705202312138) internal successors, (349), 346 states have internal predecessors, (349), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:29:51,825 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 347 states to 347 states and 349 transitions. [2021-11-03 04:29:51,825 INFO L78 Accepts]: Start accepts. Automaton has 347 states and 349 transitions. Word has length 340 [2021-11-03 04:29:51,826 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:29:51,826 INFO L470 AbstractCegarLoop]: Abstraction has 347 states and 349 transitions. [2021-11-03 04:29:51,826 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 171 states, 171 states have (on average 3.9707602339181287) internal successors, (679), 171 states have internal predecessors, (679), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:29:51,826 INFO L276 IsEmpty]: Start isEmpty. Operand 347 states and 349 transitions. [2021-11-03 04:29:51,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 347 [2021-11-03 04:29:51,828 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:29:51,828 INFO L513 BasicCegarLoop]: trace histogram [57, 57, 56, 56, 56, 56, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:29:51,877 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Forceful destruction successful, exit code 0 [2021-11-03 04:29:52,028 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1790,63 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:29:52,028 INFO L402 AbstractCegarLoop]: === Iteration 66 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:29:52,029 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:29:52,029 INFO L85 PathProgramCache]: Analyzing trace with hash -258734544, now seen corresponding path program 63 times [2021-11-03 04:29:52,029 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:29:52,029 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [342255617] [2021-11-03 04:29:52,029 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:29:52,029 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:29:52,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:29:56,080 INFO L134 CoverageAnalysis]: Checked inductivity of 9464 backedges. 6107 proven. 3357 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:29:56,080 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:29:56,081 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [342255617] [2021-11-03 04:29:56,081 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [342255617] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:29:56,081 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [642615762] [2021-11-03 04:29:56,082 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-03 04:29:56,082 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:29:56,082 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:29:56,083 INFO L229 MonitoredProcess]: Starting monitored process 64 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:29:56,084 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Waiting until timeout for monitored process [2021-11-03 04:30:03,847 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-03 04:30:03,847 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 04:30:03,855 INFO L263 TraceCheckSpWp]: Trace formula consists of 1283 conjuncts, 116 conjunts are in the unsatisfiable core [2021-11-03 04:30:03,858 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:30:08,128 INFO L134 CoverageAnalysis]: Checked inductivity of 9464 backedges. 3192 proven. 6272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:30:08,128 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:30:09,075 INFO L134 CoverageAnalysis]: Checked inductivity of 9464 backedges. 3192 proven. 6272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:30:09,075 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [642615762] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:30:09,076 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1196403817] [2021-11-03 04:30:09,076 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-03 04:30:09,076 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:30:09,077 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:30:09,077 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:30:09,077 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:30:09,079 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:30:09,079 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:30:09,080 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:30:09,080 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 04:30:09,080 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:30:09,080 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:30:09,081 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 04:30:09,081 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-03 04:30:09,083 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_70|], 10=[|v_#valid_71|]} [2021-11-03 04:30:09,087 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:30:09,088 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-03 04:30:09,088 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:30:09,088 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:30:09,089 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:30:09,089 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:30:09,089 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 04:30:09,089 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:09,091 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:30:09,094 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:30:09,095 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:30:09,096 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:30:09,099 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:30:09,104 INFO L388 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 23 treesize of output 22 [2021-11-03 04:30:09,104 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:30:09,105 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:30:09,106 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:30:09,106 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:30:09,106 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 04:30:09,106 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:09,108 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:30:09,108 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:30:09,109 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:30:09,109 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 04:30:09,109 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-03 04:30:09,113 INFO L180 QuantifierPusher]: treesize reduction 13, result has 87.3 percent of original size [2021-11-03 04:30:09,114 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:30:09,116 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:30:09,117 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:30:09,118 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:30:09,119 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:30:09,119 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 88 [2021-11-03 04:30:09,126 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.4 percent of original size [2021-11-03 04:30:09,129 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 04:30:09,130 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:09,134 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:09,135 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:09,135 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:09,136 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:09,136 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:09,138 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:09,141 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:30:09,144 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 96 [2021-11-03 04:30:09,145 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:09,160 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:09,161 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:09,161 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:09,162 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:09,163 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:09,164 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:09,168 INFO L180 QuantifierPusher]: treesize reduction 24, result has 72.4 percent of original size [2021-11-03 04:30:09,171 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 42 [2021-11-03 04:30:09,176 INFO L180 QuantifierPusher]: treesize reduction 24, result has 68.0 percent of original size [2021-11-03 04:30:09,178 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:30:09,178 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:30:09,180 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 04:30:09,181 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 34 [2021-11-03 04:30:09,184 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:30:09,186 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 73 [2021-11-03 04:30:09,188 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:09,192 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:09,196 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:09,204 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:30:09,207 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 132 [2021-11-03 04:30:09,209 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:30:09,212 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 152 [2021-11-03 04:30:09,215 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:09,225 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:09,225 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:09,226 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:09,226 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:09,227 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:09,227 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:09,229 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:09,233 INFO L180 QuantifierPusher]: treesize reduction 24, result has 77.1 percent of original size [2021-11-03 04:30:09,235 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-03 04:30:09,237 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:09,240 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:09,240 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:09,241 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:09,241 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:09,242 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:09,244 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:30:09,246 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:30:09,250 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:30:09,251 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:30:09,252 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 04:30:10,680 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 04:30:10,680 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:30:10,680 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [116, 59, 59] total 174 [2021-11-03 04:30:10,680 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1498081808] [2021-11-03 04:30:10,681 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 174 states [2021-11-03 04:30:10,681 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:30:10,682 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 174 interpolants. [2021-11-03 04:30:10,684 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5224, Invalid=28082, Unknown=0, NotChecked=0, Total=33306 [2021-11-03 04:30:10,684 INFO L87 Difference]: Start difference. First operand 347 states and 349 transitions. Second operand has 174 states, 174 states have (on average 3.971264367816092) internal successors, (691), 174 states have internal predecessors, (691), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:30:20,392 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:30:20,392 INFO L93 Difference]: Finished difference Result 758 states and 819 transitions. [2021-11-03 04:30:20,392 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 233 states. [2021-11-03 04:30:20,392 INFO L78 Accepts]: Start accepts. Automaton has has 174 states, 174 states have (on average 3.971264367816092) internal successors, (691), 174 states have internal predecessors, (691), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 346 [2021-11-03 04:30:20,393 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:30:20,394 INFO L225 Difference]: With dead ends: 758 [2021-11-03 04:30:20,395 INFO L226 Difference]: Without dead ends: 527 [2021-11-03 04:30:20,403 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 1437 GetRequests, 1027 SyntacticMatches, 1 SemanticMatches, 409 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58747 ImplicationChecksByTransitivity, 15.0s TimeCoverageRelationStatistics Valid=25633, Invalid=142877, Unknown=0, NotChecked=0, Total=168510 [2021-11-03 04:30:20,404 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 527 states. [2021-11-03 04:30:20,437 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 527 to 353. [2021-11-03 04:30:20,437 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 353 states, 352 states have (on average 1.0085227272727273) internal successors, (355), 352 states have internal predecessors, (355), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:30:20,437 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 353 states to 353 states and 355 transitions. [2021-11-03 04:30:20,438 INFO L78 Accepts]: Start accepts. Automaton has 353 states and 355 transitions. Word has length 346 [2021-11-03 04:30:20,438 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:30:20,438 INFO L470 AbstractCegarLoop]: Abstraction has 353 states and 355 transitions. [2021-11-03 04:30:20,438 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 174 states, 174 states have (on average 3.971264367816092) internal successors, (691), 174 states have internal predecessors, (691), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:30:20,438 INFO L276 IsEmpty]: Start isEmpty. Operand 353 states and 355 transitions. [2021-11-03 04:30:20,439 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 353 [2021-11-03 04:30:20,439 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:30:20,439 INFO L513 BasicCegarLoop]: trace histogram [58, 58, 57, 57, 57, 57, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:30:20,484 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Forceful destruction successful, exit code 0 [2021-11-03 04:30:20,643 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1817,64 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:30:20,644 INFO L402 AbstractCegarLoop]: === Iteration 67 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:30:20,644 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:30:20,644 INFO L85 PathProgramCache]: Analyzing trace with hash -1873047928, now seen corresponding path program 64 times [2021-11-03 04:30:20,644 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:30:20,645 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1253727542] [2021-11-03 04:30:20,645 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:30:20,645 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:30:20,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:30:24,884 INFO L134 CoverageAnalysis]: Checked inductivity of 9804 backedges. 6330 proven. 3474 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:30:24,884 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:30:24,884 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1253727542] [2021-11-03 04:30:24,884 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1253727542] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:30:24,884 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1505678548] [2021-11-03 04:30:24,884 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-03 04:30:24,884 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:30:24,884 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:30:24,885 INFO L229 MonitoredProcess]: Starting monitored process 65 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:30:24,889 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Waiting until timeout for monitored process [2021-11-03 04:30:32,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:30:32,951 INFO L263 TraceCheckSpWp]: Trace formula consists of 1305 conjuncts, 118 conjunts are in the unsatisfiable core [2021-11-03 04:30:32,954 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:30:39,226 INFO L134 CoverageAnalysis]: Checked inductivity of 9804 backedges. 6498 proven. 3306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:30:39,226 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:30:40,182 INFO L134 CoverageAnalysis]: Checked inductivity of 9804 backedges. 6498 proven. 3306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:30:40,183 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1505678548] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:30:40,183 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2053077952] [2021-11-03 04:30:40,184 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-03 04:30:40,184 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:30:40,184 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:30:40,184 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:30:40,184 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:30:40,197 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:30:40,197 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:30:40,198 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:30:40,198 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 04:30:40,199 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:30:40,199 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:30:40,200 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 04:30:40,201 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-03 04:30:40,204 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_71|], 10=[|v_#valid_72|]} [2021-11-03 04:30:40,210 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:30:40,211 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-03 04:30:40,212 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:30:40,212 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:30:40,213 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:30:40,213 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:30:40,214 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 04:30:40,214 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:40,216 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:30:40,220 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:30:40,222 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:30:40,223 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:30:40,227 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:30:40,230 INFO L388 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 23 treesize of output 22 [2021-11-03 04:30:40,231 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:30:40,233 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:30:40,234 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:30:40,234 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:30:40,234 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 04:30:40,235 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:40,237 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:30:40,238 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:30:40,239 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:30:40,240 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 04:30:40,240 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-03 04:30:40,245 INFO L180 QuantifierPusher]: treesize reduction 13, result has 87.3 percent of original size [2021-11-03 04:30:40,247 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:30:40,251 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:30:40,253 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:30:40,253 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:30:40,255 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:30:40,256 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 88 [2021-11-03 04:30:40,259 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.4 percent of original size [2021-11-03 04:30:40,262 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 91 [2021-11-03 04:30:40,265 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:40,271 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:40,272 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:40,273 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:40,274 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:40,275 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:40,277 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:40,283 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:30:40,288 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 97 [2021-11-03 04:30:40,291 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:40,298 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:40,299 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:40,300 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:40,300 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:40,301 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:40,303 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:40,306 INFO L180 QuantifierPusher]: treesize reduction 24, result has 72.4 percent of original size [2021-11-03 04:30:40,309 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 42 [2021-11-03 04:30:40,314 INFO L180 QuantifierPusher]: treesize reduction 24, result has 68.0 percent of original size [2021-11-03 04:30:40,319 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:30:40,320 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:30:40,322 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 04:30:40,322 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 34 [2021-11-03 04:30:40,327 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:30:40,329 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 73 [2021-11-03 04:30:40,331 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:40,335 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:40,339 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:40,347 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:30:40,349 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 132 [2021-11-03 04:30:40,352 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:30:40,355 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 152 [2021-11-03 04:30:40,359 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:40,371 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:40,372 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:40,372 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:40,373 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:40,374 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:40,375 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:40,377 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:40,381 INFO L180 QuantifierPusher]: treesize reduction 24, result has 77.1 percent of original size [2021-11-03 04:30:40,383 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-03 04:30:40,384 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:40,388 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:40,388 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:40,389 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:40,389 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:40,390 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:40,393 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:30:40,395 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:30:40,400 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:30:40,401 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:30:40,403 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 04:30:41,858 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 04:30:41,858 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:30:41,859 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [118, 118, 118] total 178 [2021-11-03 04:30:41,859 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [807112790] [2021-11-03 04:30:41,859 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 178 states [2021-11-03 04:30:41,860 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:30:41,861 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 178 interpolants. [2021-11-03 04:30:41,863 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7227, Invalid=27555, Unknown=0, NotChecked=0, Total=34782 [2021-11-03 04:30:41,863 INFO L87 Difference]: Start difference. First operand 353 states and 355 transitions. Second operand has 178 states, 178 states have (on average 3.303370786516854) internal successors, (588), 178 states have internal predecessors, (588), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:30:45,719 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:30:45,720 INFO L93 Difference]: Finished difference Result 764 states and 825 transitions. [2021-11-03 04:30:45,720 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 118 states. [2021-11-03 04:30:45,720 INFO L78 Accepts]: Start accepts. Automaton has has 178 states, 178 states have (on average 3.303370786516854) internal successors, (588), 178 states have internal predecessors, (588), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 352 [2021-11-03 04:30:45,720 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:30:45,722 INFO L225 Difference]: With dead ends: 764 [2021-11-03 04:30:45,722 INFO L226 Difference]: Without dead ends: 529 [2021-11-03 04:30:45,726 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 1230 GetRequests, 987 SyntacticMatches, 0 SemanticMatches, 243 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14245 ImplicationChecksByTransitivity, 11.7s TimeCoverageRelationStatistics Valid=14073, Invalid=45707, Unknown=0, NotChecked=0, Total=59780 [2021-11-03 04:30:45,727 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 529 states. [2021-11-03 04:30:45,765 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 529 to 355. [2021-11-03 04:30:45,765 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 355 states, 354 states have (on average 1.0084745762711864) internal successors, (357), 354 states have internal predecessors, (357), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:30:45,766 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 355 states to 355 states and 357 transitions. [2021-11-03 04:30:45,766 INFO L78 Accepts]: Start accepts. Automaton has 355 states and 357 transitions. Word has length 352 [2021-11-03 04:30:45,766 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:30:45,766 INFO L470 AbstractCegarLoop]: Abstraction has 355 states and 357 transitions. [2021-11-03 04:30:45,766 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 178 states, 178 states have (on average 3.303370786516854) internal successors, (588), 178 states have internal predecessors, (588), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:30:45,766 INFO L276 IsEmpty]: Start isEmpty. Operand 355 states and 357 transitions. [2021-11-03 04:30:45,768 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 355 [2021-11-03 04:30:45,768 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:30:45,768 INFO L513 BasicCegarLoop]: trace histogram [59, 58, 58, 57, 57, 57, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:30:45,816 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Forceful destruction successful, exit code 0 [2021-11-03 04:30:45,968 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1851,65 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:30:45,969 INFO L402 AbstractCegarLoop]: === Iteration 68 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:30:45,969 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:30:45,969 INFO L85 PathProgramCache]: Analyzing trace with hash 1182230509, now seen corresponding path program 65 times [2021-11-03 04:30:45,969 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:30:45,969 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [444897889] [2021-11-03 04:30:45,969 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:30:45,969 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:30:46,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:30:47,907 INFO L134 CoverageAnalysis]: Checked inductivity of 9920 backedges. 3306 proven. 6614 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:30:47,908 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:30:47,908 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [444897889] [2021-11-03 04:30:47,908 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [444897889] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:30:47,908 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [716603142] [2021-11-03 04:30:47,908 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-03 04:30:47,908 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:30:47,908 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:30:47,909 INFO L229 MonitoredProcess]: Starting monitored process 66 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:30:47,910 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Waiting until timeout for monitored process [2021-11-03 04:30:56,492 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 59 check-sat command(s) [2021-11-03 04:30:56,493 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 04:30:56,502 INFO L263 TraceCheckSpWp]: Trace formula consists of 1315 conjuncts, 119 conjunts are in the unsatisfiable core [2021-11-03 04:30:56,505 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:30:57,503 INFO L134 CoverageAnalysis]: Checked inductivity of 9920 backedges. 3422 proven. 6498 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:30:57,504 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:30:58,529 INFO L134 CoverageAnalysis]: Checked inductivity of 9920 backedges. 3422 proven. 6498 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:30:58,529 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [716603142] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:30:58,530 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [773689580] [2021-11-03 04:30:58,530 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-03 04:30:58,530 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:30:58,531 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:30:58,531 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:30:58,531 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:30:58,533 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:30:58,533 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:30:58,533 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:30:58,533 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-03 04:30:58,534 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:30:58,534 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:30:58,534 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-03 04:30:58,535 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-03 04:30:58,538 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_72|], 10=[|v_#valid_73|]} [2021-11-03 04:30:58,542 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:30:58,543 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-03 04:30:58,543 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:30:58,543 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:30:58,544 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:30:58,544 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:30:58,544 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-03 04:30:58,544 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:58,545 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:30:58,548 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:30:58,548 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:30:58,549 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:30:58,552 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-03 04:30:58,552 INFO L388 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 23 treesize of output 22 [2021-11-03 04:30:58,553 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:30:58,554 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:30:58,554 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:30:58,554 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-03 04:30:58,555 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-03 04:30:58,555 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:58,556 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:30:58,557 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:30:58,557 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:30:58,557 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-03 04:30:58,558 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:100, output treesize:85 [2021-11-03 04:30:58,561 INFO L180 QuantifierPusher]: treesize reduction 13, result has 87.3 percent of original size [2021-11-03 04:30:58,562 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 85 [2021-11-03 04:30:58,564 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:30:58,565 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:30:58,565 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:30:58,566 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-03 04:30:58,567 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 88 [2021-11-03 04:30:58,568 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.4 percent of original size [2021-11-03 04:30:58,570 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 93 [2021-11-03 04:30:58,572 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:58,575 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:58,718 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:58,719 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:58,719 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:58,720 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:58,721 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:58,724 INFO L180 QuantifierPusher]: treesize reduction 24, result has 72.4 percent of original size [2021-11-03 04:30:58,727 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 42 [2021-11-03 04:30:58,736 INFO L180 QuantifierPusher]: treesize reduction 24, result has 68.0 percent of original size [2021-11-03 04:30:58,737 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:30:58,737 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:30:58,739 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-03 04:30:58,739 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 34 [2021-11-03 04:30:58,741 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:30:58,743 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 73 [2021-11-03 04:30:58,745 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:58,750 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:58,753 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:58,760 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:30:58,762 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 121 [2021-11-03 04:30:58,764 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:30:58,767 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 141 [2021-11-03 04:30:58,769 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:58,778 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:58,778 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:58,779 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:58,779 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:58,780 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:58,781 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:58,795 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:58,800 INFO L180 QuantifierPusher]: treesize reduction 24, result has 77.1 percent of original size [2021-11-03 04:30:58,802 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-03 04:30:58,805 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:58,811 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:58,812 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:58,812 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:58,813 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:58,815 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-03 04:30:58,820 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:30:58,825 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:30:58,832 INFO L180 QuantifierPusher]: treesize reduction 24, result has 76.5 percent of original size [2021-11-03 04:30:58,834 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-03 04:30:58,836 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-03 04:30:59,725 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-03 04:30:59,725 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:30:59,725 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 61, 61] total 64 [2021-11-03 04:30:59,725 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1778159525] [2021-11-03 04:30:59,726 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 65 states [2021-11-03 04:30:59,726 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:30:59,727 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2021-11-03 04:30:59,727 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1946, Invalid=3456, Unknown=0, NotChecked=0, Total=5402 [2021-11-03 04:30:59,727 INFO L87 Difference]: Start difference. First operand 355 states and 357 transitions. Second operand has 65 states, 65 states have (on average 5.769230769230769) internal successors, (375), 64 states have internal predecessors, (375), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:31:01,357 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:31:01,357 INFO L93 Difference]: Finished difference Result 372 states and 375 transitions. [2021-11-03 04:31:01,357 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 124 states. [2021-11-03 04:31:01,358 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 65 states have (on average 5.769230769230769) internal successors, (375), 64 states have internal predecessors, (375), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 354 [2021-11-03 04:31:01,358 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:31:01,359 INFO L225 Difference]: With dead ends: 372 [2021-11-03 04:31:01,360 INFO L226 Difference]: Without dead ends: 370 [2021-11-03 04:31:01,361 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 1239 GetRequests, 1105 SyntacticMatches, 1 SemanticMatches, 133 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4936 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=5855, Invalid=12235, Unknown=0, NotChecked=0, Total=18090 [2021-11-03 04:31:01,362 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 370 states. [2021-11-03 04:31:01,411 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 370 to 363. [2021-11-03 04:31:01,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 363 states, 362 states have (on average 1.0082872928176796) internal successors, (365), 362 states have internal predecessors, (365), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:31:01,413 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 363 states to 363 states and 365 transitions. [2021-11-03 04:31:01,413 INFO L78 Accepts]: Start accepts. Automaton has 363 states and 365 transitions. Word has length 354 [2021-11-03 04:31:01,413 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:31:01,413 INFO L470 AbstractCegarLoop]: Abstraction has 363 states and 365 transitions. [2021-11-03 04:31:01,413 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 65 states, 65 states have (on average 5.769230769230769) internal successors, (375), 64 states have internal predecessors, (375), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:31:01,413 INFO L276 IsEmpty]: Start isEmpty. Operand 363 states and 365 transitions. [2021-11-03 04:31:01,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 363 [2021-11-03 04:31:01,416 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:31:01,416 INFO L513 BasicCegarLoop]: trace histogram [60, 59, 59, 59, 59, 58, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:31:01,470 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Ended with exit code 0 [2021-11-03 04:31:01,619 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 66 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24e3d08c-5efc-4339-b877-78abe3592f66/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1885 [2021-11-03 04:31:01,620 INFO L402 AbstractCegarLoop]: === Iteration 69 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:31:01,620 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:31:01,620 INFO L85 PathProgramCache]: Analyzing trace with hash 1430748371, now seen corresponding path program 66 times [2021-11-03 04:31:01,620 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:31:01,621 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1150817491] [2021-11-03 04:31:01,621 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:31:01,621 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:31:01,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat