./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-invgen/half_2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 47ea0209 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-invgen/half_2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8 --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 0b362a98d328467ff4a069dbed2be3429090ca070e60d49c76297e4bb94402b7 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-47ea020 [2021-11-07 01:20:31,161 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-07 01:20:31,163 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-07 01:20:31,216 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-07 01:20:31,217 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-07 01:20:31,218 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-07 01:20:31,223 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-07 01:20:31,228 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-07 01:20:31,230 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-07 01:20:31,239 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-07 01:20:31,240 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-07 01:20:31,242 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-07 01:20:31,243 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-07 01:20:31,248 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-07 01:20:31,252 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-07 01:20:31,256 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-07 01:20:31,257 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-07 01:20:31,258 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-07 01:20:31,264 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-07 01:20:31,269 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-07 01:20:31,276 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-07 01:20:31,280 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-07 01:20:31,282 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-07 01:20:31,285 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-07 01:20:31,290 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-07 01:20:31,297 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-07 01:20:31,298 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-07 01:20:31,299 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-07 01:20:31,301 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-07 01:20:31,302 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-07 01:20:31,304 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-07 01:20:31,305 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-07 01:20:31,306 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-07 01:20:31,308 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-07 01:20:31,310 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-07 01:20:31,311 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-07 01:20:31,312 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-07 01:20:31,312 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-07 01:20:31,313 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-07 01:20:31,314 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-07 01:20:31,315 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-07 01:20:31,316 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-07 01:20:31,368 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-07 01:20:31,368 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-07 01:20:31,370 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-07 01:20:31,370 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-07 01:20:31,371 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-07 01:20:31,371 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-07 01:20:31,371 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-07 01:20:31,371 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-07 01:20:31,376 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-07 01:20:31,376 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-07 01:20:31,377 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-07 01:20:31,378 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-07 01:20:31,378 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-07 01:20:31,378 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-07 01:20:31,379 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-07 01:20:31,380 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-07 01:20:31,380 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-07 01:20:31,380 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-07 01:20:31,380 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-07 01:20:31,381 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-07 01:20:31,381 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-07 01:20:31,381 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-07 01:20:31,382 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-07 01:20:31,382 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-07 01:20:31,382 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-07 01:20:31,382 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-07 01:20:31,383 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-07 01:20:31,383 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-07 01:20:31,383 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-07 01:20:31,386 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-07 01:20:31,386 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 01:20:31,387 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-07 01:20:31,387 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-07 01:20:31,387 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-07 01:20:31,388 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-07 01:20:31,388 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-07 01:20:31,388 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-07 01:20:31,388 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-07 01:20:31,389 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-07 01:20:31,389 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_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 0b362a98d328467ff4a069dbed2be3429090ca070e60d49c76297e4bb94402b7 [2021-11-07 01:20:31,703 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-07 01:20:31,743 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-07 01:20:31,747 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-07 01:20:31,749 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-07 01:20:31,750 INFO L275 PluginConnector]: CDTParser initialized [2021-11-07 01:20:31,751 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/../../sv-benchmarks/c/loop-invgen/half_2.i [2021-11-07 01:20:31,847 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/data/dbd40bcbd/01d156fa59054ed09aa363029b5c4518/FLAGfd40c736b [2021-11-07 01:20:32,373 INFO L306 CDTParser]: Found 1 translation units. [2021-11-07 01:20:32,375 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/sv-benchmarks/c/loop-invgen/half_2.i [2021-11-07 01:20:32,382 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/data/dbd40bcbd/01d156fa59054ed09aa363029b5c4518/FLAGfd40c736b [2021-11-07 01:20:32,719 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/data/dbd40bcbd/01d156fa59054ed09aa363029b5c4518 [2021-11-07 01:20:32,722 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-07 01:20:32,724 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-07 01:20:32,727 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-07 01:20:32,727 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-07 01:20:32,730 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-07 01:20:32,731 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:20:32" (1/1) ... [2021-11-07 01:20:32,733 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@83c28b2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:20:32, skipping insertion in model container [2021-11-07 01:20:32,733 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:20:32" (1/1) ... [2021-11-07 01:20:32,755 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-07 01:20:32,771 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 01:20:33,015 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_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/sv-benchmarks/c/loop-invgen/half_2.i[893,906] [2021-11-07 01:20:33,050 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 01:20:33,061 INFO L203 MainTranslator]: Completed pre-run [2021-11-07 01:20:33,084 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_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/sv-benchmarks/c/loop-invgen/half_2.i[893,906] [2021-11-07 01:20:33,093 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 01:20:33,112 INFO L208 MainTranslator]: Completed translation [2021-11-07 01:20:33,113 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:20:33 WrapperNode [2021-11-07 01:20:33,113 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-07 01:20:33,114 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-07 01:20:33,114 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-07 01:20:33,115 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-07 01:20:33,123 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:20:33" (1/1) ... [2021-11-07 01:20:33,133 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:20:33" (1/1) ... [2021-11-07 01:20:33,158 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-07 01:20:33,160 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-07 01:20:33,160 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-07 01:20:33,160 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-07 01:20:33,170 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:20:33" (1/1) ... [2021-11-07 01:20:33,170 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:20:33" (1/1) ... [2021-11-07 01:20:33,186 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:20:33" (1/1) ... [2021-11-07 01:20:33,186 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:20:33" (1/1) ... [2021-11-07 01:20:33,190 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:20:33" (1/1) ... [2021-11-07 01:20:33,197 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:20:33" (1/1) ... [2021-11-07 01:20:33,204 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:20:33" (1/1) ... [2021-11-07 01:20:33,211 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-07 01:20:33,212 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-07 01:20:33,212 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-07 01:20:33,212 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-07 01:20:33,214 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:20:33" (1/1) ... [2021-11-07 01:20:33,224 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 01:20:33,238 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:20:33,253 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-07 01:20:33,280 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-07 01:20:33,321 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-07 01:20:33,321 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-07 01:20:33,323 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-07 01:20:33,324 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-07 01:20:33,604 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-07 01:20:33,609 INFO L299 CfgBuilder]: Removed 8 assume(true) statements. [2021-11-07 01:20:33,611 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:20:33 BoogieIcfgContainer [2021-11-07 01:20:33,612 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-07 01:20:33,614 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-07 01:20:33,614 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-07 01:20:33,618 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-07 01:20:33,618 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 01:20:32" (1/3) ... [2021-11-07 01:20:33,619 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1a086f42 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:20:33, skipping insertion in model container [2021-11-07 01:20:33,620 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:20:33" (2/3) ... [2021-11-07 01:20:33,620 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1a086f42 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:20:33, skipping insertion in model container [2021-11-07 01:20:33,620 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:20:33" (3/3) ... [2021-11-07 01:20:33,622 INFO L111 eAbstractionObserver]: Analyzing ICFG half_2.i [2021-11-07 01:20:33,628 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-07 01:20:33,628 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-07 01:20:33,699 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-07 01:20:33,707 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 [2021-11-07 01:20:33,723 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-07 01:20:33,740 INFO L276 IsEmpty]: Start isEmpty. Operand has 10 states, 8 states have (on average 1.625) internal successors, (13), 9 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:20:33,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-07 01:20:33,747 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:20:33,747 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-07 01:20:33,748 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:20:33,754 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:20:33,755 INFO L85 PathProgramCache]: Analyzing trace with hash -2025251484, now seen corresponding path program 1 times [2021-11-07 01:20:33,766 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:20:33,767 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [31749657] [2021-11-07 01:20:33,767 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:20:33,769 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:20:33,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:20:34,024 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:20:34,024 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:20:34,032 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [31749657] [2021-11-07 01:20:34,034 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [31749657] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:20:34,035 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:20:34,035 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-07 01:20:34,037 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [102847959] [2021-11-07 01:20:34,044 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-07 01:20:34,046 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:20:34,067 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-07 01:20:34,068 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-07 01:20:34,070 INFO L87 Difference]: Start difference. First operand has 10 states, 8 states have (on average 1.625) internal successors, (13), 9 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 5 states, 5 states have (on average 1.2) internal successors, (6), 5 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:20:34,170 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:20:34,170 INFO L93 Difference]: Finished difference Result 26 states and 32 transitions. [2021-11-07 01:20:34,171 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-07 01:20:34,172 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.2) internal successors, (6), 5 states have internal predecessors, (6), 0 states have call successors, (0), 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 6 [2021-11-07 01:20:34,172 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:20:34,180 INFO L225 Difference]: With dead ends: 26 [2021-11-07 01:20:34,180 INFO L226 Difference]: Without dead ends: 13 [2021-11-07 01:20:34,183 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-07 01:20:34,199 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2021-11-07 01:20:34,211 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 11. [2021-11-07 01:20:34,217 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11 states, 10 states have (on average 1.3) internal successors, (13), 10 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:20:34,219 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 13 transitions. [2021-11-07 01:20:34,220 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 13 transitions. Word has length 6 [2021-11-07 01:20:34,221 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:20:34,221 INFO L470 AbstractCegarLoop]: Abstraction has 11 states and 13 transitions. [2021-11-07 01:20:34,221 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.2) internal successors, (6), 5 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:20:34,221 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 13 transitions. [2021-11-07 01:20:34,222 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-07 01:20:34,222 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:20:34,222 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:20:34,222 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-07 01:20:34,224 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:20:34,230 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:20:34,230 INFO L85 PathProgramCache]: Analyzing trace with hash 1610042692, now seen corresponding path program 1 times [2021-11-07 01:20:34,230 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:20:34,231 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1491929548] [2021-11-07 01:20:34,232 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:20:34,232 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:20:34,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:20:34,382 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:20:34,382 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:20:34,383 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1491929548] [2021-11-07 01:20:34,383 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1491929548] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:20:34,383 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1069445920] [2021-11-07 01:20:34,384 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:20:34,384 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:20:34,384 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:20:34,392 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:20:34,408 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-07 01:20:34,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:20:34,451 INFO L263 TraceCheckSpWp]: Trace formula consists of 48 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-07 01:20:34,456 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:20:34,852 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:20:34,852 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:20:35,143 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:20:35,144 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1069445920] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:20:35,144 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [695323416] [2021-11-07 01:20:35,170 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-07 01:20:35,171 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 01:20:35,176 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-07 01:20:35,183 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-07 01:20:35,184 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-07 01:20:35,235 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:35,238 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:20:35,240 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:35,241 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-07 01:20:35,243 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:20:35,244 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:35,245 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-07 01:20:35,248 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 97 [2021-11-07 01:20:35,284 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_8|], 10=[|v_#valid_9|]} [2021-11-07 01:20:35,297 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:20:35,306 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 [2021-11-07 01:20:35,307 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:35,309 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:20:35,311 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:35,314 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:20:35,315 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-07 01:20:35,317 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:35,371 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:35,376 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:20:35,384 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:20:35,386 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:20:35,392 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:20:35,395 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 [2021-11-07 01:20:35,396 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:35,398 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:20:35,399 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:35,400 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:20:35,401 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-07 01:20:35,401 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:35,415 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:35,417 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:35,419 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 79 [2021-11-07 01:20:35,420 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-07 01:20:35,420 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:94, output treesize:79 [2021-11-07 01:20:35,430 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.1 percent of original size [2021-11-07 01:20:35,435 INFO L185 QuantifierPusher]: treesize reduction 5, result has 94.4 percent of original size 85 [2021-11-07 01:20:35,439 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:35,469 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:35,504 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:35,570 INFO L180 QuantifierPusher]: treesize reduction 3, result has 98.7 percent of original size [2021-11-07 01:20:35,591 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 227 [2021-11-07 01:20:35,602 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:35,682 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:35,684 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:35,685 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:35,687 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:35,688 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:35,698 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:35,705 INFO L180 QuantifierPusher]: treesize reduction 24, result has 69.6 percent of original size [2021-11-07 01:20:35,709 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 46 [2021-11-07 01:20:35,712 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:35,719 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:35,728 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:35,749 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:35,760 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 101 [2021-11-07 01:20:35,764 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:35,784 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:35,785 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:35,787 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:35,788 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:35,802 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:35,814 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-07 01:20:35,820 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-07 01:20:35,833 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-07 01:20:36,381 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-07 01:20:36,381 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-07 01:20:36,381 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2021-11-07 01:20:36,382 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1155396651] [2021-11-07 01:20:36,383 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-07 01:20:36,383 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:20:36,384 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-07 01:20:36,385 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=218, Unknown=0, NotChecked=0, Total=272 [2021-11-07 01:20:36,385 INFO L87 Difference]: Start difference. First operand 11 states and 13 transitions. Second operand has 12 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 12 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:20:36,872 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:20:36,872 INFO L93 Difference]: Finished difference Result 36 states and 42 transitions. [2021-11-07 01:20:36,873 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-07 01:20:36,873 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 12 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2021-11-07 01:20:36,873 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:20:36,874 INFO L225 Difference]: With dead ends: 36 [2021-11-07 01:20:36,874 INFO L226 Difference]: Without dead ends: 34 [2021-11-07 01:20:36,877 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 8 SyntacticMatches, 2 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 181 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=159, Invalid=653, Unknown=0, NotChecked=0, Total=812 [2021-11-07 01:20:36,878 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-11-07 01:20:36,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 16. [2021-11-07 01:20:36,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.3333333333333333) internal successors, (20), 15 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:20:36,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 20 transitions. [2021-11-07 01:20:36,888 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 20 transitions. Word has length 7 [2021-11-07 01:20:36,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:20:36,891 INFO L470 AbstractCegarLoop]: Abstraction has 16 states and 20 transitions. [2021-11-07 01:20:36,905 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 12 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:20:36,905 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 20 transitions. [2021-11-07 01:20:36,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-07 01:20:36,906 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:20:36,907 INFO L513 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1] [2021-11-07 01:20:36,952 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-07 01:20:37,135 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:20:37,136 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:20:37,137 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:20:37,137 INFO L85 PathProgramCache]: Analyzing trace with hash 49336644, now seen corresponding path program 2 times [2021-11-07 01:20:37,137 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:20:37,137 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [852425941] [2021-11-07 01:20:37,137 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:20:37,138 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:20:37,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:20:37,256 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:20:37,257 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:20:37,257 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [852425941] [2021-11-07 01:20:37,258 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [852425941] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:20:37,259 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [749823147] [2021-11-07 01:20:37,259 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-07 01:20:37,259 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:20:37,259 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:20:37,260 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:20:37,283 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-07 01:20:37,326 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-07 01:20:37,326 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:20:37,327 INFO L263 TraceCheckSpWp]: Trace formula consists of 58 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-07 01:20:37,328 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:20:37,433 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:20:37,433 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:20:37,560 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:20:37,560 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [749823147] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:20:37,560 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1399273539] [2021-11-07 01:20:37,563 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-07 01:20:37,564 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 01:20:37,564 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-07 01:20:37,564 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-07 01:20:37,564 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-07 01:20:37,570 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:37,571 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:20:37,576 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:37,576 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-07 01:20:37,577 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:20:37,578 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:37,580 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-07 01:20:37,581 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 97 [2021-11-07 01:20:37,588 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_9|], 10=[|v_#valid_10|]} [2021-11-07 01:20:37,595 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:20:37,598 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 [2021-11-07 01:20:37,599 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:37,599 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:20:37,600 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:37,605 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:20:37,606 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-07 01:20:37,606 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:37,609 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:37,613 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:20:37,614 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:20:37,616 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:20:37,622 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:20:37,625 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 [2021-11-07 01:20:37,626 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:37,635 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:20:37,636 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:37,637 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:20:37,637 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-07 01:20:37,638 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:37,641 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:37,643 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:37,646 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 79 [2021-11-07 01:20:37,651 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-07 01:20:37,651 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:94, output treesize:79 [2021-11-07 01:20:37,660 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.1 percent of original size [2021-11-07 01:20:37,667 INFO L185 QuantifierPusher]: treesize reduction 5, result has 94.4 percent of original size 85 [2021-11-07 01:20:37,670 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:37,682 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:37,693 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:37,721 INFO L180 QuantifierPusher]: treesize reduction 3, result has 98.7 percent of original size [2021-11-07 01:20:37,730 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 227 [2021-11-07 01:20:37,735 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:37,774 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:37,775 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:37,776 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:37,777 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:37,778 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:37,787 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:37,793 INFO L180 QuantifierPusher]: treesize reduction 24, result has 69.6 percent of original size [2021-11-07 01:20:37,798 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 46 [2021-11-07 01:20:37,800 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:37,806 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:37,814 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:37,829 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:37,834 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 101 [2021-11-07 01:20:37,836 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:37,857 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:37,860 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:37,862 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:37,863 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:37,869 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:37,894 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-07 01:20:37,898 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-07 01:20:37,905 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-07 01:20:38,394 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-07 01:20:38,394 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-07 01:20:38,395 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 15 [2021-11-07 01:20:38,395 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1117710648] [2021-11-07 01:20:38,395 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-07 01:20:38,396 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:20:38,396 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-07 01:20:38,397 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=304, Unknown=0, NotChecked=0, Total=380 [2021-11-07 01:20:38,397 INFO L87 Difference]: Start difference. First operand 16 states and 20 transitions. Second operand has 15 states, 15 states have (on average 1.4) internal successors, (21), 15 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) [2021-11-07 01:20:38,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:20:38,812 INFO L93 Difference]: Finished difference Result 46 states and 51 transitions. [2021-11-07 01:20:38,812 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-07 01:20:38,813 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.4) internal successors, (21), 15 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2021-11-07 01:20:38,813 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:20:38,814 INFO L225 Difference]: With dead ends: 46 [2021-11-07 01:20:38,814 INFO L226 Difference]: Without dead ends: 44 [2021-11-07 01:20:38,815 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 242 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=237, Invalid=885, Unknown=0, NotChecked=0, Total=1122 [2021-11-07 01:20:38,815 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-11-07 01:20:38,821 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 16. [2021-11-07 01:20:38,822 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.3333333333333333) internal successors, (20), 15 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:20:38,822 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 20 transitions. [2021-11-07 01:20:38,823 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 20 transitions. Word has length 9 [2021-11-07 01:20:38,823 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:20:38,823 INFO L470 AbstractCegarLoop]: Abstraction has 16 states and 20 transitions. [2021-11-07 01:20:38,823 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.4) internal successors, (21), 15 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) [2021-11-07 01:20:38,824 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 20 transitions. [2021-11-07 01:20:38,824 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-07 01:20:38,824 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:20:38,824 INFO L513 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:20:38,867 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2021-11-07 01:20:39,039 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-11-07 01:20:39,040 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:20:39,040 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:20:39,040 INFO L85 PathProgramCache]: Analyzing trace with hash 1438439610, now seen corresponding path program 1 times [2021-11-07 01:20:39,040 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:20:39,040 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1317130010] [2021-11-07 01:20:39,041 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:20:39,041 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:20:39,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:20:39,137 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:20:39,138 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:20:39,140 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1317130010] [2021-11-07 01:20:39,140 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1317130010] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:20:39,140 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1560370255] [2021-11-07 01:20:39,141 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:20:39,141 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:20:39,141 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:20:39,142 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:20:39,167 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-07 01:20:39,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:20:39,210 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-07 01:20:39,211 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:20:39,262 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:20:39,262 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:20:39,311 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:20:39,311 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1560370255] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:20:39,311 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2021-11-07 01:20:39,311 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [6] total 10 [2021-11-07 01:20:39,312 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [664695386] [2021-11-07 01:20:39,312 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 01:20:39,312 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:20:39,336 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 01:20:39,337 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-11-07 01:20:39,337 INFO L87 Difference]: Start difference. First operand 16 states and 20 transitions. Second operand has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 6 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:20:39,388 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:20:39,388 INFO L93 Difference]: Finished difference Result 23 states and 27 transitions. [2021-11-07 01:20:39,389 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-07 01:20:39,389 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 6 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2021-11-07 01:20:39,390 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:20:39,390 INFO L225 Difference]: With dead ends: 23 [2021-11-07 01:20:39,390 INFO L226 Difference]: Without dead ends: 16 [2021-11-07 01:20:39,391 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2021-11-07 01:20:39,391 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2021-11-07 01:20:39,399 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2021-11-07 01:20:39,400 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 15 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:20:39,400 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 19 transitions. [2021-11-07 01:20:39,401 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 19 transitions. Word has length 9 [2021-11-07 01:20:39,401 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:20:39,401 INFO L470 AbstractCegarLoop]: Abstraction has 16 states and 19 transitions. [2021-11-07 01:20:39,402 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 6 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:20:39,402 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 19 transitions. [2021-11-07 01:20:39,403 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-07 01:20:39,403 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:20:39,403 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:20:39,446 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-07 01:20:39,631 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable45 [2021-11-07 01:20:39,632 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:20:39,632 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:20:39,632 INFO L85 PathProgramCache]: Analyzing trace with hash 543513786, now seen corresponding path program 1 times [2021-11-07 01:20:39,633 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:20:39,633 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [222532372] [2021-11-07 01:20:39,633 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:20:39,633 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:20:39,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:20:39,841 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:20:39,841 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:20:39,841 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [222532372] [2021-11-07 01:20:39,842 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [222532372] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:20:39,842 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [212393896] [2021-11-07 01:20:39,842 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:20:39,842 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:20:39,842 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:20:39,843 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:20:39,867 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-07 01:20:39,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:20:39,932 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-07 01:20:39,934 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:20:40,143 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:20:40,144 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:20:40,481 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:20:40,482 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [212393896] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:20:40,482 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1979326173] [2021-11-07 01:20:40,486 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-07 01:20:40,486 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 01:20:40,486 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-07 01:20:40,486 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-07 01:20:40,487 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-07 01:20:40,499 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:40,500 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:20:40,501 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:40,501 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-07 01:20:40,502 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:20:40,502 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:40,503 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-07 01:20:40,504 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 97 [2021-11-07 01:20:40,510 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_10|], 10=[|v_#valid_11|]} [2021-11-07 01:20:40,526 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:20:40,527 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 [2021-11-07 01:20:40,528 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:40,528 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:20:40,529 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:40,529 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:20:40,529 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-07 01:20:40,530 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:40,533 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:40,536 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:20:40,538 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:20:40,539 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:20:40,544 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:20:40,550 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 [2021-11-07 01:20:40,551 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:40,552 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:20:40,553 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:40,554 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:20:40,554 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-07 01:20:40,554 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:40,571 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:40,572 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:40,573 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 79 [2021-11-07 01:20:40,574 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-07 01:20:40,574 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:94, output treesize:79 [2021-11-07 01:20:40,581 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.1 percent of original size [2021-11-07 01:20:40,584 INFO L185 QuantifierPusher]: treesize reduction 5, result has 94.4 percent of original size 85 [2021-11-07 01:20:40,588 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:40,605 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:40,617 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:40,643 INFO L180 QuantifierPusher]: treesize reduction 3, result has 98.7 percent of original size [2021-11-07 01:20:40,649 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 227 [2021-11-07 01:20:40,655 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:40,695 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:40,696 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:40,697 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:40,698 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:40,699 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:40,704 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:40,710 INFO L180 QuantifierPusher]: treesize reduction 24, result has 69.6 percent of original size [2021-11-07 01:20:40,714 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 46 [2021-11-07 01:20:40,716 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:40,721 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:40,727 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:40,747 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:40,751 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 101 [2021-11-07 01:20:40,753 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:40,764 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:40,765 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:40,766 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:40,767 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:40,772 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:40,777 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-07 01:20:40,779 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-07 01:20:40,787 INFO L180 QuantifierPusher]: treesize reduction 25, result has 81.5 percent of original size [2021-11-07 01:20:40,792 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-07 01:20:40,794 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:40,805 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:40,807 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:40,808 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:40,809 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:40,810 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:40,811 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:40,813 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:40,814 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:40,819 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:40,826 INFO L180 QuantifierPusher]: treesize reduction 24, result has 81.7 percent of original size [2021-11-07 01:20:40,830 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 102 [2021-11-07 01:20:40,837 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-07 01:20:41,475 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-07 01:20:41,475 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-07 01:20:41,475 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 18 [2021-11-07 01:20:41,476 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1381701486] [2021-11-07 01:20:41,476 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-07 01:20:41,476 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:20:41,477 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-07 01:20:41,477 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=465, Unknown=0, NotChecked=0, Total=552 [2021-11-07 01:20:41,477 INFO L87 Difference]: Start difference. First operand 16 states and 19 transitions. Second operand has 18 states, 18 states have (on average 1.5) internal successors, (27), 18 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:20:42,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:20:42,123 INFO L93 Difference]: Finished difference Result 42 states and 48 transitions. [2021-11-07 01:20:42,124 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-07 01:20:42,124 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.5) internal successors, (27), 18 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-11-07 01:20:42,124 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:20:42,125 INFO L225 Difference]: With dead ends: 42 [2021-11-07 01:20:42,125 INFO L226 Difference]: Without dead ends: 25 [2021-11-07 01:20:42,126 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 327 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=249, Invalid=1233, Unknown=0, NotChecked=0, Total=1482 [2021-11-07 01:20:42,126 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-11-07 01:20:42,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 16. [2021-11-07 01:20:42,132 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 15 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) [2021-11-07 01:20:42,132 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2021-11-07 01:20:42,132 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 11 [2021-11-07 01:20:42,133 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:20:42,133 INFO L470 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2021-11-07 01:20:42,133 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 1.5) internal successors, (27), 18 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:20:42,133 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2021-11-07 01:20:42,134 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-07 01:20:42,134 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:20:42,134 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1] [2021-11-07 01:20:42,179 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-07 01:20:42,347 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable46 [2021-11-07 01:20:42,348 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:20:42,348 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:20:42,348 INFO L85 PathProgramCache]: Analyzing trace with hash -1965317756, now seen corresponding path program 2 times [2021-11-07 01:20:42,348 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:20:42,349 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [548583367] [2021-11-07 01:20:42,349 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:20:42,349 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:20:42,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:20:42,636 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 1 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:20:42,636 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:20:42,636 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [548583367] [2021-11-07 01:20:42,636 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [548583367] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:20:42,636 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [625371968] [2021-11-07 01:20:42,636 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-07 01:20:42,637 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:20:42,637 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:20:42,637 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:20:42,638 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-07 01:20:42,741 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-07 01:20:42,741 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:20:42,742 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-07 01:20:42,746 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:20:43,047 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:20:43,047 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:20:43,606 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:20:43,606 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [625371968] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:20:43,606 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1314998917] [2021-11-07 01:20:43,609 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-07 01:20:43,609 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 01:20:43,610 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-07 01:20:43,610 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-07 01:20:43,610 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-07 01:20:43,617 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:43,618 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:20:43,619 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:43,620 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-07 01:20:43,620 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:20:43,621 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:43,621 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-07 01:20:43,625 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 97 [2021-11-07 01:20:43,629 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_11|], 10=[|v_#valid_12|]} [2021-11-07 01:20:43,635 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:20:43,636 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 [2021-11-07 01:20:43,637 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:43,637 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:20:43,638 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:43,638 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:20:43,639 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-07 01:20:43,639 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:43,641 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:43,644 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:20:43,645 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:20:43,647 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:20:43,651 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:20:43,653 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 [2021-11-07 01:20:43,654 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:43,658 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:20:43,658 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:43,659 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:20:43,659 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-07 01:20:43,660 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:43,662 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:43,663 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:43,664 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 79 [2021-11-07 01:20:43,664 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-07 01:20:43,665 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:94, output treesize:79 [2021-11-07 01:20:43,668 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.1 percent of original size [2021-11-07 01:20:43,670 INFO L185 QuantifierPusher]: treesize reduction 5, result has 94.4 percent of original size 85 [2021-11-07 01:20:43,672 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:43,679 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:43,686 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:43,702 INFO L180 QuantifierPusher]: treesize reduction 3, result has 98.7 percent of original size [2021-11-07 01:20:43,707 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 227 [2021-11-07 01:20:43,711 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:43,729 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:43,731 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:43,732 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:43,733 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:43,734 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:43,739 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:43,743 INFO L180 QuantifierPusher]: treesize reduction 24, result has 69.6 percent of original size [2021-11-07 01:20:43,745 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 46 [2021-11-07 01:20:43,747 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:43,752 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:43,757 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:43,767 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:43,770 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 101 [2021-11-07 01:20:43,772 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:43,780 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:43,781 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:43,782 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:43,783 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:43,787 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:43,801 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-07 01:20:43,804 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-07 01:20:43,810 INFO L180 QuantifierPusher]: treesize reduction 25, result has 81.5 percent of original size [2021-11-07 01:20:43,812 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 107 [2021-11-07 01:20:43,815 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:43,824 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:43,825 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:43,826 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:43,827 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:43,828 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:43,829 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:43,829 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:43,830 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:43,833 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:43,839 INFO L180 QuantifierPusher]: treesize reduction 24, result has 81.7 percent of original size [2021-11-07 01:20:43,842 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 102 [2021-11-07 01:20:43,852 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-07 01:20:44,509 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-07 01:20:44,509 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-07 01:20:44,509 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 26 [2021-11-07 01:20:44,509 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [351091344] [2021-11-07 01:20:44,510 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-07 01:20:44,510 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:20:44,510 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-07 01:20:44,511 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=861, Unknown=0, NotChecked=0, Total=992 [2021-11-07 01:20:44,512 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand has 26 states, 26 states have (on average 1.5384615384615385) internal successors, (40), 26 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:20:44,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:20:44,900 INFO L93 Difference]: Finished difference Result 32 states and 36 transitions. [2021-11-07 01:20:44,901 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-07 01:20:44,901 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.5384615384615385) internal successors, (40), 26 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2021-11-07 01:20:44,902 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:20:44,902 INFO L225 Difference]: With dead ends: 32 [2021-11-07 01:20:44,902 INFO L226 Difference]: Without dead ends: 18 [2021-11-07 01:20:44,903 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 368 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=209, Invalid=1351, Unknown=0, NotChecked=0, Total=1560 [2021-11-07 01:20:44,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-11-07 01:20:44,908 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17. [2021-11-07 01:20:44,908 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 16 states have (on average 1.125) internal successors, (18), 16 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:20:44,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2021-11-07 01:20:44,909 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 15 [2021-11-07 01:20:44,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:20:44,910 INFO L470 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2021-11-07 01:20:44,910 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 1.5384615384615385) internal successors, (40), 26 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:20:44,910 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2021-11-07 01:20:44,911 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-07 01:20:44,911 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:20:44,911 INFO L513 BasicCegarLoop]: trace histogram [4, 3, 2, 2, 1, 1, 1, 1, 1] [2021-11-07 01:20:44,955 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-07 01:20:45,123 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable78,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:20:45,124 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:20:45,124 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:20:45,124 INFO L85 PathProgramCache]: Analyzing trace with hash -772452956, now seen corresponding path program 3 times [2021-11-07 01:20:45,124 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:20:45,125 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [493558810] [2021-11-07 01:20:45,125 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:20:45,125 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:20:45,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:20:45,255 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 3 proven. 14 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:20:45,255 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:20:45,255 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [493558810] [2021-11-07 01:20:45,256 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [493558810] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:20:45,256 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1793744946] [2021-11-07 01:20:45,256 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-07 01:20:45,256 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:20:45,256 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:20:45,258 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:20:45,271 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-07 01:20:45,402 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-07 01:20:45,402 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:20:45,403 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-07 01:20:45,417 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:20:45,548 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:20:45,549 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:20:45,691 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:20:45,691 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1793744946] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:20:45,692 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [504162513] [2021-11-07 01:20:45,697 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-07 01:20:45,698 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 01:20:45,698 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-07 01:20:45,698 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-07 01:20:45,698 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-07 01:20:45,707 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:45,708 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:20:45,709 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:45,709 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-07 01:20:45,710 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:20:45,710 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:45,711 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-07 01:20:45,712 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 97 [2021-11-07 01:20:45,716 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_12|], 10=[|v_#valid_13|]} [2021-11-07 01:20:45,722 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:20:45,723 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 [2021-11-07 01:20:45,723 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:45,725 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:20:45,726 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:45,726 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:20:45,727 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-07 01:20:45,727 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:45,730 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:45,733 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:20:45,734 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:20:45,735 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:20:45,739 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:20:45,741 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 [2021-11-07 01:20:45,741 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:45,753 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:20:45,753 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:45,754 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:20:45,754 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-07 01:20:45,755 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:45,764 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:45,765 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:45,766 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 79 [2021-11-07 01:20:45,766 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-07 01:20:45,767 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:94, output treesize:79 [2021-11-07 01:20:45,770 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.1 percent of original size [2021-11-07 01:20:45,773 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-07 01:20:45,776 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:45,784 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:45,792 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:45,811 INFO L180 QuantifierPusher]: treesize reduction 3, result has 98.7 percent of original size [2021-11-07 01:20:45,817 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 229 [2021-11-07 01:20:45,822 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:45,849 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:45,850 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:45,851 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:45,853 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:45,856 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:45,861 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:45,866 INFO L180 QuantifierPusher]: treesize reduction 24, result has 69.6 percent of original size [2021-11-07 01:20:45,868 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 46 [2021-11-07 01:20:45,870 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:45,876 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:45,883 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:45,894 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:45,897 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 101 [2021-11-07 01:20:45,900 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:45,909 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:45,912 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:45,914 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:45,916 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:45,920 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:45,924 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-07 01:20:45,926 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-07 01:20:45,933 INFO L180 QuantifierPusher]: treesize reduction 25, result has 81.5 percent of original size [2021-11-07 01:20:45,936 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-07 01:20:45,939 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:45,950 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:45,952 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:45,953 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:45,954 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:45,955 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:45,956 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:45,957 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:45,958 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:45,964 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:45,971 INFO L180 QuantifierPusher]: treesize reduction 24, result has 81.7 percent of original size [2021-11-07 01:20:45,974 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 102 [2021-11-07 01:20:45,982 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-07 01:20:46,447 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-07 01:20:46,447 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-07 01:20:46,447 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 19 [2021-11-07 01:20:46,447 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [806627282] [2021-11-07 01:20:46,448 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-07 01:20:46,448 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:20:46,448 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-07 01:20:46,449 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=507, Unknown=0, NotChecked=0, Total=600 [2021-11-07 01:20:46,449 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand has 19 states, 19 states have (on average 1.4736842105263157) internal successors, (28), 19 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:20:46,628 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:20:46,628 INFO L93 Difference]: Finished difference Result 28 states and 29 transitions. [2021-11-07 01:20:46,628 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-07 01:20:46,628 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.4736842105263157) internal successors, (28), 19 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2021-11-07 01:20:46,629 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:20:46,629 INFO L225 Difference]: With dead ends: 28 [2021-11-07 01:20:46,629 INFO L226 Difference]: Without dead ends: 26 [2021-11-07 01:20:46,630 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 30 SyntacticMatches, 3 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 252 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=179, Invalid=877, Unknown=0, NotChecked=0, Total=1056 [2021-11-07 01:20:46,630 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-11-07 01:20:46,636 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 20. [2021-11-07 01:20:46,636 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.105263157894737) internal successors, (21), 19 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) [2021-11-07 01:20:46,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2021-11-07 01:20:46,637 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 16 [2021-11-07 01:20:46,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:20:46,637 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2021-11-07 01:20:46,638 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.4736842105263157) internal successors, (28), 19 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:20:46,638 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2021-11-07 01:20:46,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-07 01:20:46,639 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:20:46,639 INFO L513 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 1, 1, 1, 1, 1] [2021-11-07 01:20:46,666 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-07 01:20:46,843 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable110,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:20:46,844 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:20:46,844 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:20:46,844 INFO L85 PathProgramCache]: Analyzing trace with hash 293585018, now seen corresponding path program 4 times [2021-11-07 01:20:46,844 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:20:46,844 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1724305305] [2021-11-07 01:20:46,845 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:20:46,845 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:20:46,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:20:47,188 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 5 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:20:47,188 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:20:47,188 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1724305305] [2021-11-07 01:20:47,188 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1724305305] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:20:47,188 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1599673670] [2021-11-07 01:20:47,189 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-07 01:20:47,189 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:20:47,189 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:20:47,190 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:20:47,209 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-07 01:20:47,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:20:47,357 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-07 01:20:47,359 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:20:47,729 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:20:47,729 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:20:48,448 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:20:48,449 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1599673670] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:20:48,449 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1185579823] [2021-11-07 01:20:48,450 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-07 01:20:48,450 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 01:20:48,451 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-07 01:20:48,451 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-07 01:20:48,451 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-07 01:20:48,461 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:48,461 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:20:48,462 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:48,463 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-07 01:20:48,463 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:20:48,463 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:48,466 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-07 01:20:48,468 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 97 [2021-11-07 01:20:48,471 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_13|], 10=[|v_#valid_14|]} [2021-11-07 01:20:48,476 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:20:48,477 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 [2021-11-07 01:20:48,477 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:48,478 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:20:48,478 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:48,479 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:20:48,479 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-07 01:20:48,479 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:48,482 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:48,484 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:20:48,485 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:20:48,486 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:20:48,490 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:20:48,493 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 [2021-11-07 01:20:48,493 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:48,495 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:20:48,496 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:48,496 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:20:48,496 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-07 01:20:48,497 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:48,499 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:48,500 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:48,501 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 79 [2021-11-07 01:20:48,501 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-07 01:20:48,501 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:94, output treesize:79 [2021-11-07 01:20:48,505 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.1 percent of original size [2021-11-07 01:20:48,507 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-07 01:20:48,509 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:48,515 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:48,522 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:48,538 INFO L180 QuantifierPusher]: treesize reduction 3, result has 98.7 percent of original size [2021-11-07 01:20:48,543 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 229 [2021-11-07 01:20:48,546 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:48,565 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:48,568 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:48,569 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:48,570 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:48,571 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:48,577 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:48,581 INFO L180 QuantifierPusher]: treesize reduction 24, result has 69.6 percent of original size [2021-11-07 01:20:48,583 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 46 [2021-11-07 01:20:48,585 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:48,589 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:48,613 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:48,623 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:48,626 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 101 [2021-11-07 01:20:48,628 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:48,637 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:48,639 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:48,639 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:48,640 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:48,643 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:48,648 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-07 01:20:48,649 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-07 01:20:48,656 INFO L180 QuantifierPusher]: treesize reduction 25, result has 81.5 percent of original size [2021-11-07 01:20:48,659 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-07 01:20:48,661 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:48,673 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:48,674 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:48,675 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:48,676 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:48,677 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:48,678 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:48,679 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:48,680 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:48,684 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:48,690 INFO L180 QuantifierPusher]: treesize reduction 24, result has 81.7 percent of original size [2021-11-07 01:20:48,693 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 102 [2021-11-07 01:20:48,700 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-07 01:20:49,297 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-07 01:20:49,297 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-07 01:20:49,297 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 28 [2021-11-07 01:20:49,298 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [912026138] [2021-11-07 01:20:49,298 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-07 01:20:49,298 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:20:49,298 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-07 01:20:49,299 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=154, Invalid=968, Unknown=0, NotChecked=0, Total=1122 [2021-11-07 01:20:49,300 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand has 28 states, 28 states have (on average 1.75) internal successors, (49), 28 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:20:50,364 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:20:50,365 INFO L93 Difference]: Finished difference Result 55 states and 63 transitions. [2021-11-07 01:20:50,365 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-07 01:20:50,366 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.75) internal successors, (49), 28 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2021-11-07 01:20:50,366 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:20:50,368 INFO L225 Difference]: With dead ends: 55 [2021-11-07 01:20:50,368 INFO L226 Difference]: Without dead ends: 38 [2021-11-07 01:20:50,369 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 34 SyntacticMatches, 2 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 686 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=401, Invalid=2461, Unknown=0, NotChecked=0, Total=2862 [2021-11-07 01:20:50,370 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-11-07 01:20:50,380 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 28. [2021-11-07 01:20:50,380 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 27 states have (on average 1.2222222222222223) internal successors, (33), 27 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:20:50,381 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 33 transitions. [2021-11-07 01:20:50,381 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 33 transitions. Word has length 19 [2021-11-07 01:20:50,381 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:20:50,381 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 33 transitions. [2021-11-07 01:20:50,382 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 1.75) internal successors, (49), 28 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:20:50,382 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 33 transitions. [2021-11-07 01:20:50,383 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-07 01:20:50,383 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:20:50,383 INFO L513 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 1, 1, 1, 1, 1] [2021-11-07 01:20:50,423 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-07 01:20:50,599 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable142,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:20:50,600 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:20:50,600 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:20:50,600 INFO L85 PathProgramCache]: Analyzing trace with hash -486816316, now seen corresponding path program 5 times [2021-11-07 01:20:50,600 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:20:50,601 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [252720409] [2021-11-07 01:20:50,601 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:20:50,601 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:20:50,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:20:50,933 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 12 proven. 29 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:20:50,933 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:20:50,934 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [252720409] [2021-11-07 01:20:50,934 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [252720409] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:20:50,934 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2021338869] [2021-11-07 01:20:50,934 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-07 01:20:50,934 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:20:50,934 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:20:50,938 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:20:50,959 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-07 01:20:51,135 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-07 01:20:51,135 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:20:51,136 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-07 01:20:51,138 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:20:51,673 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 41 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:20:51,674 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:20:52,592 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 41 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:20:52,596 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2021338869] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:20:52,596 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1028717564] [2021-11-07 01:20:52,598 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-07 01:20:52,601 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 01:20:52,601 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-07 01:20:52,602 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-07 01:20:52,602 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-07 01:20:52,605 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:52,606 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:20:52,607 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:52,607 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-07 01:20:52,608 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:20:52,608 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:52,609 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-07 01:20:52,610 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 97 [2021-11-07 01:20:52,613 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_14|], 10=[|v_#valid_15|]} [2021-11-07 01:20:52,617 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:20:52,618 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 [2021-11-07 01:20:52,619 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:52,620 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:20:52,621 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:52,621 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:20:52,621 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-07 01:20:52,622 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:52,636 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:52,639 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:20:52,640 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:20:52,642 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:20:52,645 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:20:52,647 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 [2021-11-07 01:20:52,648 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:52,650 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:20:52,652 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:52,652 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:20:52,653 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-07 01:20:52,653 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:52,659 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:52,660 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:52,661 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 79 [2021-11-07 01:20:52,662 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-07 01:20:52,662 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:94, output treesize:79 [2021-11-07 01:20:52,667 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.1 percent of original size [2021-11-07 01:20:52,671 INFO L185 QuantifierPusher]: treesize reduction 5, result has 94.4 percent of original size 85 [2021-11-07 01:20:52,674 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:52,684 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:52,692 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:52,711 INFO L180 QuantifierPusher]: treesize reduction 3, result has 98.7 percent of original size [2021-11-07 01:20:52,715 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 227 [2021-11-07 01:20:52,720 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:52,742 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:52,743 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:52,744 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:52,745 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:52,746 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:52,749 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:52,754 INFO L180 QuantifierPusher]: treesize reduction 24, result has 69.6 percent of original size [2021-11-07 01:20:52,755 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 46 [2021-11-07 01:20:52,758 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:52,763 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:52,787 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:52,799 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:52,802 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 101 [2021-11-07 01:20:52,804 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:52,815 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:52,816 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:52,817 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:52,818 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:52,821 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:52,825 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-07 01:20:52,827 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-07 01:20:52,833 INFO L180 QuantifierPusher]: treesize reduction 25, result has 81.5 percent of original size [2021-11-07 01:20:52,836 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-07 01:20:52,839 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:52,850 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:52,851 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:52,852 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:52,853 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:52,854 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:52,855 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:52,856 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:52,857 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:52,860 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:52,867 INFO L180 QuantifierPusher]: treesize reduction 24, result has 81.7 percent of original size [2021-11-07 01:20:52,870 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 102 [2021-11-07 01:20:52,877 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-07 01:20:53,520 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-07 01:20:53,520 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-07 01:20:53,520 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 14] total 38 [2021-11-07 01:20:53,520 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1338296981] [2021-11-07 01:20:53,522 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-11-07 01:20:53,522 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:20:53,522 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-11-07 01:20:53,523 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=225, Invalid=1667, Unknown=0, NotChecked=0, Total=1892 [2021-11-07 01:20:53,524 INFO L87 Difference]: Start difference. First operand 28 states and 33 transitions. Second operand has 38 states, 38 states have (on average 1.6842105263157894) internal successors, (64), 38 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:20:54,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:20:54,349 INFO L93 Difference]: Finished difference Result 51 states and 57 transitions. [2021-11-07 01:20:54,349 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-07 01:20:54,349 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.6842105263157894) internal successors, (64), 38 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2021-11-07 01:20:54,350 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:20:54,350 INFO L225 Difference]: With dead ends: 51 [2021-11-07 01:20:54,350 INFO L226 Difference]: Without dead ends: 31 [2021-11-07 01:20:54,352 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 39 SyntacticMatches, 1 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 798 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=388, Invalid=2804, Unknown=0, NotChecked=0, Total=3192 [2021-11-07 01:20:54,353 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-11-07 01:20:54,363 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2021-11-07 01:20:54,363 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 27 states have (on average 1.1851851851851851) internal successors, (32), 27 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:20:54,364 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2021-11-07 01:20:54,364 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 23 [2021-11-07 01:20:54,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:20:54,365 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2021-11-07 01:20:54,365 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 1.6842105263157894) internal successors, (64), 38 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:20:54,365 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2021-11-07 01:20:54,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-07 01:20:54,366 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:20:54,367 INFO L513 BasicCegarLoop]: trace histogram [9, 4, 3, 3, 1, 1, 1, 1, 1] [2021-11-07 01:20:54,407 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-07 01:20:54,591 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable174,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:20:54,592 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:20:54,592 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:20:54,592 INFO L85 PathProgramCache]: Analyzing trace with hash -711895910, now seen corresponding path program 6 times [2021-11-07 01:20:54,592 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:20:54,592 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [352323259] [2021-11-07 01:20:54,593 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:20:54,593 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:20:54,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:20:54,816 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 28 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:20:54,816 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:20:54,816 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [352323259] [2021-11-07 01:20:54,816 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [352323259] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:20:54,816 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1367183606] [2021-11-07 01:20:54,816 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-07 01:20:54,817 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:20:54,817 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:20:54,818 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:20:54,847 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-07 01:20:55,087 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-07 01:20:55,087 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:20:55,089 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-07 01:20:55,091 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:20:55,422 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:20:55,422 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:20:55,765 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:20:55,765 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1367183606] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:20:55,765 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1360746485] [2021-11-07 01:20:55,767 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-07 01:20:55,767 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 01:20:55,768 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-07 01:20:55,768 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-07 01:20:55,768 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-07 01:20:55,776 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:55,777 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:20:55,777 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:55,778 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-07 01:20:55,778 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:20:55,778 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:55,779 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-07 01:20:55,779 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 97 [2021-11-07 01:20:55,781 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_15|], 10=[|v_#valid_16|]} [2021-11-07 01:20:55,787 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:20:55,788 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 [2021-11-07 01:20:55,788 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:55,789 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:20:55,789 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:55,790 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:20:55,790 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-07 01:20:55,790 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:55,793 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:55,796 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:20:55,797 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:20:55,798 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:20:55,802 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:20:55,803 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 [2021-11-07 01:20:55,807 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:55,809 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:20:55,809 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:55,810 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:20:55,810 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-07 01:20:55,811 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:55,813 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:55,814 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:55,815 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 79 [2021-11-07 01:20:55,816 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-07 01:20:55,816 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:94, output treesize:79 [2021-11-07 01:20:55,820 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.1 percent of original size [2021-11-07 01:20:55,822 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-07 01:20:55,824 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:55,838 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:55,847 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:55,866 INFO L180 QuantifierPusher]: treesize reduction 3, result has 98.7 percent of original size [2021-11-07 01:20:55,870 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 229 [2021-11-07 01:20:55,874 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:55,899 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:55,900 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:55,902 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:55,903 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:55,904 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:55,907 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:55,916 INFO L180 QuantifierPusher]: treesize reduction 24, result has 69.6 percent of original size [2021-11-07 01:20:55,918 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 46 [2021-11-07 01:20:55,920 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:55,925 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:55,931 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:55,941 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:20:55,945 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 101 [2021-11-07 01:20:55,947 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:55,971 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:55,972 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:55,974 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:55,975 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:55,982 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:55,986 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-07 01:20:55,988 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-07 01:20:55,997 INFO L180 QuantifierPusher]: treesize reduction 25, result has 81.5 percent of original size [2021-11-07 01:20:56,000 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-07 01:20:56,003 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:56,014 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:56,015 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:56,016 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:56,017 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:56,018 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:56,019 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:56,020 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:56,022 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:56,025 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:20:56,032 INFO L180 QuantifierPusher]: treesize reduction 24, result has 81.7 percent of original size [2021-11-07 01:20:56,035 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 102 [2021-11-07 01:20:56,045 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-07 01:20:56,759 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-07 01:20:56,759 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-07 01:20:56,759 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 39 [2021-11-07 01:20:56,759 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [107152677] [2021-11-07 01:20:56,760 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-07 01:20:56,760 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:20:56,761 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-07 01:20:56,762 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=345, Invalid=1635, Unknown=0, NotChecked=0, Total=1980 [2021-11-07 01:20:56,762 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand has 39 states, 39 states have (on average 1.4615384615384615) internal successors, (57), 39 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) [2021-11-07 01:20:57,647 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:20:57,647 INFO L93 Difference]: Finished difference Result 97 states and 108 transitions. [2021-11-07 01:20:57,647 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-11-07 01:20:57,647 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 1.4615384615384615) internal successors, (57), 39 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 24 [2021-11-07 01:20:57,648 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:20:57,648 INFO L225 Difference]: With dead ends: 97 [2021-11-07 01:20:57,649 INFO L226 Difference]: Without dead ends: 95 [2021-11-07 01:20:57,651 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 41 SyntacticMatches, 2 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1671 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1185, Invalid=4365, Unknown=0, NotChecked=0, Total=5550 [2021-11-07 01:20:57,651 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2021-11-07 01:20:57,663 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 40. [2021-11-07 01:20:57,663 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 39 states have (on average 1.1282051282051282) internal successors, (44), 39 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:20:57,664 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 44 transitions. [2021-11-07 01:20:57,664 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 44 transitions. Word has length 24 [2021-11-07 01:20:57,664 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:20:57,665 INFO L470 AbstractCegarLoop]: Abstraction has 40 states and 44 transitions. [2021-11-07 01:20:57,665 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 1.4615384615384615) internal successors, (57), 39 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) [2021-11-07 01:20:57,665 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 44 transitions. [2021-11-07 01:20:57,666 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-07 01:20:57,666 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:20:57,666 INFO L513 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 1, 1, 1, 1, 1] [2021-11-07 01:20:57,697 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-07 01:20:57,883 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable206 [2021-11-07 01:20:57,884 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:20:57,884 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:20:57,884 INFO L85 PathProgramCache]: Analyzing trace with hash 569136186, now seen corresponding path program 7 times [2021-11-07 01:20:57,884 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:20:57,884 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1529394303] [2021-11-07 01:20:57,885 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:20:57,885 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:20:57,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:20:58,293 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 22 proven. 39 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:20:58,293 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:20:58,293 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1529394303] [2021-11-07 01:20:58,293 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1529394303] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:20:58,293 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [7461183] [2021-11-07 01:20:58,294 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-07 01:20:58,294 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:20:58,294 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:20:58,296 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:20:58,319 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-07 01:20:58,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:20:58,623 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-07 01:20:58,625 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:20:59,125 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 0 proven. 61 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:20:59,125 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:21:00,170 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 0 proven. 61 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:21:00,170 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [7461183] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:21:00,170 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1755095305] [2021-11-07 01:21:00,173 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-07 01:21:00,173 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 01:21:00,173 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-07 01:21:00,173 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-07 01:21:00,174 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-07 01:21:00,177 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:00,178 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:21:00,179 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:00,179 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-07 01:21:00,180 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:21:00,180 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:00,181 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-07 01:21:00,182 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 97 [2021-11-07 01:21:00,184 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_16|], 10=[|v_#valid_17|]} [2021-11-07 01:21:00,190 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:21:00,191 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 [2021-11-07 01:21:00,192 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:00,193 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:21:00,193 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:00,194 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:21:00,194 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-07 01:21:00,194 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:00,197 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:00,200 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:21:00,201 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:21:00,202 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:21:00,206 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:21:00,207 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 [2021-11-07 01:21:00,208 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:00,210 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:21:00,210 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:00,211 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:21:00,211 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-07 01:21:00,212 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:00,214 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:00,215 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:00,216 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 79 [2021-11-07 01:21:00,217 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-07 01:21:00,217 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:94, output treesize:79 [2021-11-07 01:21:00,221 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.1 percent of original size [2021-11-07 01:21:00,223 INFO L185 QuantifierPusher]: treesize reduction 5, result has 94.4 percent of original size 85 [2021-11-07 01:21:00,225 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:00,232 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:00,240 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:00,256 INFO L180 QuantifierPusher]: treesize reduction 3, result has 98.7 percent of original size [2021-11-07 01:21:00,260 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 227 [2021-11-07 01:21:00,264 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:00,280 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:00,281 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:00,282 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:00,283 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:00,284 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:00,286 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:00,290 INFO L180 QuantifierPusher]: treesize reduction 24, result has 69.6 percent of original size [2021-11-07 01:21:00,291 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 46 [2021-11-07 01:21:00,293 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:00,297 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:00,301 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:00,309 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:00,311 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 101 [2021-11-07 01:21:00,313 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:00,320 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:00,321 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:00,322 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:00,323 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:00,325 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:00,328 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-07 01:21:00,329 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-07 01:21:00,334 INFO L180 QuantifierPusher]: treesize reduction 25, result has 81.5 percent of original size [2021-11-07 01:21:00,337 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 107 [2021-11-07 01:21:00,339 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:00,346 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:00,347 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:00,348 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:00,349 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:00,350 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:00,350 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:00,351 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:00,352 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:00,354 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:00,359 INFO L180 QuantifierPusher]: treesize reduction 24, result has 81.7 percent of original size [2021-11-07 01:21:00,361 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 102 [2021-11-07 01:21:00,367 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-07 01:21:01,027 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-07 01:21:01,028 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-07 01:21:01,028 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16, 16] total 38 [2021-11-07 01:21:01,028 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [670216306] [2021-11-07 01:21:01,029 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-11-07 01:21:01,029 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:21:01,030 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-11-07 01:21:01,030 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=249, Invalid=1643, Unknown=0, NotChecked=0, Total=1892 [2021-11-07 01:21:01,031 INFO L87 Difference]: Start difference. First operand 40 states and 44 transitions. Second operand has 38 states, 38 states have (on average 1.868421052631579) internal successors, (71), 38 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) [2021-11-07 01:21:02,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:21:02,874 INFO L93 Difference]: Finished difference Result 124 states and 133 transitions. [2021-11-07 01:21:02,874 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-11-07 01:21:02,874 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.868421052631579) internal successors, (71), 38 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) Word has length 27 [2021-11-07 01:21:02,874 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:21:02,875 INFO L225 Difference]: With dead ends: 124 [2021-11-07 01:21:02,875 INFO L226 Difference]: Without dead ends: 101 [2021-11-07 01:21:02,877 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 52 SyntacticMatches, 2 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1281 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=686, Invalid=4426, Unknown=0, NotChecked=0, Total=5112 [2021-11-07 01:21:02,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2021-11-07 01:21:02,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 40. [2021-11-07 01:21:02,890 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 39 states have (on average 1.1025641025641026) internal successors, (43), 39 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:21:02,890 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 43 transitions. [2021-11-07 01:21:02,890 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 43 transitions. Word has length 27 [2021-11-07 01:21:02,891 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:21:02,891 INFO L470 AbstractCegarLoop]: Abstraction has 40 states and 43 transitions. [2021-11-07 01:21:02,891 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 1.868421052631579) internal successors, (71), 38 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) [2021-11-07 01:21:02,891 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 43 transitions. [2021-11-07 01:21:02,892 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-11-07 01:21:02,892 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:21:02,892 INFO L513 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 1, 1, 1, 1, 1] [2021-11-07 01:21:02,913 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-07 01:21:03,093 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable238 [2021-11-07 01:21:03,094 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:21:03,094 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:21:03,094 INFO L85 PathProgramCache]: Analyzing trace with hash 1681635844, now seen corresponding path program 8 times [2021-11-07 01:21:03,095 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:21:03,095 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1841664777] [2021-11-07 01:21:03,095 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:21:03,095 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:21:03,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:21:03,654 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 35 proven. 50 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:21:03,654 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:21:03,654 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1841664777] [2021-11-07 01:21:03,654 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1841664777] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:21:03,654 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1382598584] [2021-11-07 01:21:03,654 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-07 01:21:03,655 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:21:03,655 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:21:03,656 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:21:03,660 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-07 01:21:04,006 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-11-07 01:21:04,007 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:21:04,008 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-07 01:21:04,011 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:21:04,723 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:21:04,723 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:21:05,999 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:21:06,000 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1382598584] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:21:06,000 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1614154084] [2021-11-07 01:21:06,002 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-07 01:21:06,002 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 01:21:06,003 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-07 01:21:06,003 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-07 01:21:06,003 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-07 01:21:06,008 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:06,009 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:21:06,010 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:06,010 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-07 01:21:06,011 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:21:06,011 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:06,013 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-07 01:21:06,014 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 97 [2021-11-07 01:21:06,016 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_17|], 10=[|v_#valid_18|]} [2021-11-07 01:21:06,021 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:21:06,022 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 [2021-11-07 01:21:06,023 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:06,023 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:21:06,023 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:06,024 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:21:06,024 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-07 01:21:06,024 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:06,026 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:06,029 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:21:06,030 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:21:06,031 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:21:06,035 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:21:06,036 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 [2021-11-07 01:21:06,037 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:06,039 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:21:06,039 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:06,040 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:21:06,040 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-07 01:21:06,041 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:06,043 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:06,044 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:06,045 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 79 [2021-11-07 01:21:06,045 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-07 01:21:06,046 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:94, output treesize:79 [2021-11-07 01:21:06,050 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.1 percent of original size [2021-11-07 01:21:06,052 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-07 01:21:06,055 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:06,064 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:06,072 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:06,089 INFO L180 QuantifierPusher]: treesize reduction 3, result has 98.7 percent of original size [2021-11-07 01:21:06,093 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 229 [2021-11-07 01:21:06,097 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:06,118 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:06,119 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:06,120 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:06,121 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:06,121 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:06,124 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:06,128 INFO L180 QuantifierPusher]: treesize reduction 24, result has 69.6 percent of original size [2021-11-07 01:21:06,130 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 46 [2021-11-07 01:21:06,132 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:06,137 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:06,147 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:06,158 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:06,161 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 101 [2021-11-07 01:21:06,163 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:06,176 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:06,177 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:06,178 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:06,179 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:06,182 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:06,185 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-07 01:21:06,187 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-07 01:21:06,197 INFO L180 QuantifierPusher]: treesize reduction 25, result has 81.5 percent of original size [2021-11-07 01:21:06,200 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 107 [2021-11-07 01:21:06,203 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:06,213 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:06,214 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:06,223 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:06,224 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:06,225 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:06,226 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:06,227 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:06,228 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:06,234 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:06,242 INFO L180 QuantifierPusher]: treesize reduction 24, result has 81.7 percent of original size [2021-11-07 01:21:06,245 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 102 [2021-11-07 01:21:06,252 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-07 01:21:06,979 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-07 01:21:06,979 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-07 01:21:06,979 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 18] total 50 [2021-11-07 01:21:06,979 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1762165603] [2021-11-07 01:21:06,980 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2021-11-07 01:21:06,980 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:21:06,983 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-11-07 01:21:06,985 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=351, Invalid=2729, Unknown=0, NotChecked=0, Total=3080 [2021-11-07 01:21:06,985 INFO L87 Difference]: Start difference. First operand 40 states and 43 transitions. Second operand has 50 states, 50 states have (on average 1.76) internal successors, (88), 50 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:21:08,273 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:21:08,273 INFO L93 Difference]: Finished difference Result 69 states and 73 transitions. [2021-11-07 01:21:08,274 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-07 01:21:08,274 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 1.76) internal successors, (88), 50 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 31 [2021-11-07 01:21:08,274 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:21:08,275 INFO L225 Difference]: With dead ends: 69 [2021-11-07 01:21:08,275 INFO L226 Difference]: Without dead ends: 43 [2021-11-07 01:21:08,277 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 55 SyntacticMatches, 1 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1348 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=610, Invalid=4646, Unknown=0, NotChecked=0, Total=5256 [2021-11-07 01:21:08,278 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-11-07 01:21:08,292 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 40. [2021-11-07 01:21:08,292 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 39 states have (on average 1.0769230769230769) internal successors, (42), 39 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:21:08,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2021-11-07 01:21:08,293 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 31 [2021-11-07 01:21:08,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:21:08,293 INFO L470 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2021-11-07 01:21:08,293 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 1.76) internal successors, (88), 50 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:21:08,293 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2021-11-07 01:21:08,294 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-07 01:21:08,295 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:21:08,295 INFO L513 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 1, 1, 1, 1, 1] [2021-11-07 01:21:08,321 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-07 01:21:08,503 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable270,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:21:08,504 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:21:08,504 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:21:08,504 INFO L85 PathProgramCache]: Analyzing trace with hash 994514938, now seen corresponding path program 9 times [2021-11-07 01:21:08,505 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:21:08,505 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [624255882] [2021-11-07 01:21:08,505 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:21:08,505 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:21:08,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:21:09,128 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 51 proven. 62 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:21:09,129 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:21:09,129 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [624255882] [2021-11-07 01:21:09,129 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [624255882] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:21:09,129 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1949140484] [2021-11-07 01:21:09,129 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-07 01:21:09,129 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:21:09,130 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:21:09,130 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:21:09,131 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-07 01:21:09,532 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-07 01:21:09,532 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:21:09,534 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 37 conjunts are in the unsatisfiable core [2021-11-07 01:21:09,537 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:21:10,124 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 0 proven. 113 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:21:10,124 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:21:11,556 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 0 proven. 113 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:21:11,557 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1949140484] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:21:11,557 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1318350983] [2021-11-07 01:21:11,559 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-07 01:21:11,559 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 01:21:11,560 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-07 01:21:11,560 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-07 01:21:11,560 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-07 01:21:11,564 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:11,564 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:21:11,565 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:11,565 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-07 01:21:11,566 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:21:11,566 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:11,567 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-07 01:21:11,568 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 97 [2021-11-07 01:21:11,570 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_18|], 10=[|v_#valid_19|]} [2021-11-07 01:21:11,576 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:21:11,578 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 [2021-11-07 01:21:11,578 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:11,579 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:21:11,579 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:11,580 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:21:11,580 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-07 01:21:11,581 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:11,583 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:11,586 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:21:11,587 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:21:11,588 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:21:11,592 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:21:11,595 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 [2021-11-07 01:21:11,596 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:11,597 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:21:11,598 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:11,598 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:21:11,598 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-07 01:21:11,599 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:11,601 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:11,602 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:11,603 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 79 [2021-11-07 01:21:11,603 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-07 01:21:11,604 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:94, output treesize:79 [2021-11-07 01:21:11,607 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.1 percent of original size [2021-11-07 01:21:11,610 INFO L185 QuantifierPusher]: treesize reduction 5, result has 94.4 percent of original size 85 [2021-11-07 01:21:11,612 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:11,619 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:11,626 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:11,641 INFO L180 QuantifierPusher]: treesize reduction 3, result has 98.7 percent of original size [2021-11-07 01:21:11,662 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 227 [2021-11-07 01:21:11,666 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:11,700 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:11,701 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:11,702 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:11,703 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:11,704 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:11,708 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:11,712 INFO L180 QuantifierPusher]: treesize reduction 24, result has 69.6 percent of original size [2021-11-07 01:21:11,714 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 46 [2021-11-07 01:21:11,717 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:11,722 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:11,728 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:11,739 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:11,742 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 101 [2021-11-07 01:21:11,745 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:11,755 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:11,756 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:11,757 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:11,758 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:11,760 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:11,765 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-07 01:21:11,767 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-07 01:21:11,773 INFO L180 QuantifierPusher]: treesize reduction 25, result has 81.5 percent of original size [2021-11-07 01:21:11,776 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 107 [2021-11-07 01:21:11,780 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:11,791 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:11,792 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:11,793 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:11,794 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:11,795 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:11,796 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:11,797 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:11,798 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:11,801 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:11,809 INFO L180 QuantifierPusher]: treesize reduction 24, result has 81.7 percent of original size [2021-11-07 01:21:11,812 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 102 [2021-11-07 01:21:11,819 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-07 01:21:12,519 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-07 01:21:12,519 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-07 01:21:12,520 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20, 20] total 48 [2021-11-07 01:21:12,520 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1336977855] [2021-11-07 01:21:12,520 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-07 01:21:12,520 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:21:12,521 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-07 01:21:12,522 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=372, Invalid=2490, Unknown=0, NotChecked=0, Total=2862 [2021-11-07 01:21:12,522 INFO L87 Difference]: Start difference. First operand 40 states and 42 transitions. Second operand has 48 states, 48 states have (on average 1.9375) internal successors, (93), 48 states have internal predecessors, (93), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:21:14,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:21:14,942 INFO L93 Difference]: Finished difference Result 102 states and 113 transitions. [2021-11-07 01:21:14,942 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-11-07 01:21:14,943 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 1.9375) internal successors, (93), 48 states have internal predecessors, (93), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 35 [2021-11-07 01:21:14,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:21:14,943 INFO L225 Difference]: With dead ends: 102 [2021-11-07 01:21:14,944 INFO L226 Difference]: Without dead ends: 73 [2021-11-07 01:21:14,947 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 70 SyntacticMatches, 2 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2053 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=1055, Invalid=6955, Unknown=0, NotChecked=0, Total=8010 [2021-11-07 01:21:14,947 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2021-11-07 01:21:14,964 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 40. [2021-11-07 01:21:14,964 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 39 states have (on average 1.0512820512820513) internal successors, (41), 39 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:21:14,965 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 41 transitions. [2021-11-07 01:21:14,966 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 41 transitions. Word has length 35 [2021-11-07 01:21:14,966 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:21:14,966 INFO L470 AbstractCegarLoop]: Abstraction has 40 states and 41 transitions. [2021-11-07 01:21:14,966 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 1.9375) internal successors, (93), 48 states have internal predecessors, (93), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:21:14,967 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 41 transitions. [2021-11-07 01:21:14,968 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-11-07 01:21:14,968 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:21:14,968 INFO L513 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 1, 1, 1, 1, 1] [2021-11-07 01:21:14,994 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-07 01:21:15,175 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable302,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:21:15,176 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:21:15,176 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:21:15,176 INFO L85 PathProgramCache]: Analyzing trace with hash -1887470012, now seen corresponding path program 10 times [2021-11-07 01:21:15,176 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:21:15,176 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1071166659] [2021-11-07 01:21:15,176 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:21:15,177 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:21:15,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:21:15,806 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 70 proven. 75 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:21:15,806 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:21:15,806 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1071166659] [2021-11-07 01:21:15,806 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1071166659] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:21:15,806 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1567306926] [2021-11-07 01:21:15,807 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-07 01:21:15,807 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:21:15,807 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:21:15,808 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:21:15,809 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-07 01:21:16,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:21:16,285 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 41 conjunts are in the unsatisfiable core [2021-11-07 01:21:16,288 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:21:16,950 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 0 proven. 145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:21:16,950 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:21:18,418 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 0 proven. 145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:21:18,418 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1567306926] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:21:18,418 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [867188168] [2021-11-07 01:21:18,420 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-07 01:21:18,420 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 01:21:18,420 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-07 01:21:18,421 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-07 01:21:18,421 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-07 01:21:18,428 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:18,429 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:21:18,429 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:18,429 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-07 01:21:18,430 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:21:18,430 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:18,430 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-07 01:21:18,431 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 97 [2021-11-07 01:21:18,433 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_19|], 10=[|v_#valid_20|]} [2021-11-07 01:21:18,437 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:21:18,438 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 [2021-11-07 01:21:18,438 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:18,439 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:21:18,439 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:18,439 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:21:18,440 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-07 01:21:18,440 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:18,441 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:18,444 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:21:18,445 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:21:18,445 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:21:18,448 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:21:18,451 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 [2021-11-07 01:21:18,452 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:18,453 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:21:18,453 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:18,454 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:21:18,454 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-07 01:21:18,454 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:18,463 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:18,464 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:18,465 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 79 [2021-11-07 01:21:18,466 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-07 01:21:18,466 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:94, output treesize:79 [2021-11-07 01:21:18,470 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.1 percent of original size [2021-11-07 01:21:18,472 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-07 01:21:18,475 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:18,479 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:18,486 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:18,502 INFO L180 QuantifierPusher]: treesize reduction 3, result has 98.7 percent of original size [2021-11-07 01:21:18,508 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 229 [2021-11-07 01:21:18,512 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:18,528 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:18,529 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:18,530 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:18,531 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:18,532 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:18,536 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:18,540 INFO L180 QuantifierPusher]: treesize reduction 24, result has 69.6 percent of original size [2021-11-07 01:21:18,542 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 46 [2021-11-07 01:21:18,543 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:18,547 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:18,553 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:18,559 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:18,561 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 101 [2021-11-07 01:21:18,563 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:18,593 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:18,594 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:18,595 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:18,596 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:18,598 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:18,602 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-07 01:21:18,604 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-07 01:21:18,610 INFO L180 QuantifierPusher]: treesize reduction 25, result has 81.5 percent of original size [2021-11-07 01:21:18,619 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-07 01:21:18,622 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:18,632 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:18,634 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:18,634 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:18,635 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:18,636 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:18,637 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:18,638 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:18,639 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:18,642 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:18,647 INFO L180 QuantifierPusher]: treesize reduction 24, result has 81.7 percent of original size [2021-11-07 01:21:18,650 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 102 [2021-11-07 01:21:18,656 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-07 01:21:19,357 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-07 01:21:19,357 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-07 01:21:19,357 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22, 22] total 53 [2021-11-07 01:21:19,358 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [718798943] [2021-11-07 01:21:19,358 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2021-11-07 01:21:19,358 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:21:19,358 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-11-07 01:21:19,360 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=444, Invalid=2978, Unknown=0, NotChecked=0, Total=3422 [2021-11-07 01:21:19,360 INFO L87 Difference]: Start difference. First operand 40 states and 41 transitions. Second operand has 53 states, 53 states have (on average 1.9622641509433962) internal successors, (104), 53 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:21:22,180 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:21:22,180 INFO L93 Difference]: Finished difference Result 110 states and 123 transitions. [2021-11-07 01:21:22,181 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-11-07 01:21:22,181 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 1.9622641509433962) internal successors, (104), 53 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 39 [2021-11-07 01:21:22,182 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:21:22,182 INFO L225 Difference]: With dead ends: 110 [2021-11-07 01:21:22,183 INFO L226 Difference]: Without dead ends: 78 [2021-11-07 01:21:22,187 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 79 SyntacticMatches, 2 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2505 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=1271, Invalid=8431, Unknown=0, NotChecked=0, Total=9702 [2021-11-07 01:21:22,187 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2021-11-07 01:21:22,207 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 53. [2021-11-07 01:21:22,207 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 52 states have (on average 1.2115384615384615) internal successors, (63), 52 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) [2021-11-07 01:21:22,208 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 63 transitions. [2021-11-07 01:21:22,208 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 63 transitions. Word has length 39 [2021-11-07 01:21:22,208 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:21:22,208 INFO L470 AbstractCegarLoop]: Abstraction has 53 states and 63 transitions. [2021-11-07 01:21:22,209 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 1.9622641509433962) internal successors, (104), 53 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:21:22,209 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 63 transitions. [2021-11-07 01:21:22,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-07 01:21:22,210 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:21:22,210 INFO L513 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 1, 1, 1, 1, 1] [2021-11-07 01:21:22,235 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-07 01:21:22,412 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable334 [2021-11-07 01:21:22,413 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:21:22,413 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:21:22,413 INFO L85 PathProgramCache]: Analyzing trace with hash -1574171718, now seen corresponding path program 11 times [2021-11-07 01:21:22,413 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:21:22,413 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [922020037] [2021-11-07 01:21:22,413 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:21:22,414 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:21:22,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:21:23,109 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 92 proven. 89 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:21:23,109 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:21:23,109 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [922020037] [2021-11-07 01:21:23,109 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [922020037] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:21:23,109 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [663201974] [2021-11-07 01:21:23,109 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-07 01:21:23,110 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:21:23,110 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:21:23,110 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:21:23,113 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-07 01:21:23,727 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-11-07 01:21:23,727 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:21:23,729 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-07 01:21:23,731 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:21:24,756 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 0 proven. 181 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:21:24,756 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:21:26,541 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 0 proven. 181 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:21:26,541 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [663201974] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:21:26,541 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [132587464] [2021-11-07 01:21:26,543 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-07 01:21:26,543 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 01:21:26,543 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-07 01:21:26,544 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-07 01:21:26,544 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-07 01:21:26,549 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:26,550 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:21:26,550 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:26,551 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-07 01:21:26,551 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:21:26,552 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:26,552 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-07 01:21:26,553 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 97 [2021-11-07 01:21:26,555 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_20|], 10=[|v_#valid_21|]} [2021-11-07 01:21:26,559 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:21:26,560 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 [2021-11-07 01:21:26,561 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:26,561 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:21:26,565 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:26,565 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:21:26,566 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-07 01:21:26,570 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:26,572 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:26,574 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:21:26,575 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:21:26,576 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:21:26,578 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:21:26,579 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 [2021-11-07 01:21:26,580 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:26,581 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:21:26,581 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:26,581 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:21:26,582 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-07 01:21:26,582 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:26,584 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:26,585 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:26,585 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 79 [2021-11-07 01:21:26,586 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-07 01:21:26,586 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:94, output treesize:79 [2021-11-07 01:21:26,589 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.1 percent of original size [2021-11-07 01:21:26,591 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-07 01:21:26,593 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:26,597 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:26,600 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:26,609 INFO L180 QuantifierPusher]: treesize reduction 3, result has 98.7 percent of original size [2021-11-07 01:21:26,611 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 229 [2021-11-07 01:21:26,614 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:26,624 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:26,625 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:26,625 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:26,626 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:26,626 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:26,628 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:26,630 INFO L180 QuantifierPusher]: treesize reduction 24, result has 69.6 percent of original size [2021-11-07 01:21:26,631 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 46 [2021-11-07 01:21:26,632 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:26,636 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:26,640 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:26,644 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:26,646 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 101 [2021-11-07 01:21:26,647 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:26,651 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:26,652 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:26,653 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:26,654 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:26,665 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:26,668 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-07 01:21:26,669 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-07 01:21:26,674 INFO L180 QuantifierPusher]: treesize reduction 25, result has 81.5 percent of original size [2021-11-07 01:21:26,677 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 107 [2021-11-07 01:21:26,679 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:26,686 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:26,687 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:26,688 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:26,689 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:26,689 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:26,690 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:26,691 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:26,692 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:26,699 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:26,703 INFO L180 QuantifierPusher]: treesize reduction 24, result has 81.7 percent of original size [2021-11-07 01:21:26,705 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 102 [2021-11-07 01:21:26,709 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-07 01:21:27,467 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-07 01:21:27,467 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-07 01:21:27,467 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24, 24] total 68 [2021-11-07 01:21:27,468 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1237364544] [2021-11-07 01:21:27,468 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 68 states [2021-11-07 01:21:27,468 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:21:27,469 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2021-11-07 01:21:27,470 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=600, Invalid=4802, Unknown=0, NotChecked=0, Total=5402 [2021-11-07 01:21:27,470 INFO L87 Difference]: Start difference. First operand 53 states and 63 transitions. Second operand has 68 states, 68 states have (on average 1.8235294117647058) internal successors, (124), 68 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:21:29,955 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:21:29,956 INFO L93 Difference]: Finished difference Result 91 states and 102 transitions. [2021-11-07 01:21:29,957 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-07 01:21:29,957 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 68 states have (on average 1.8235294117647058) internal successors, (124), 68 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 43 [2021-11-07 01:21:29,958 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:21:29,958 INFO L225 Difference]: With dead ends: 91 [2021-11-07 01:21:29,958 INFO L226 Difference]: Without dead ends: 56 [2021-11-07 01:21:29,960 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 79 SyntacticMatches, 1 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2428 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=1048, Invalid=8264, Unknown=0, NotChecked=0, Total=9312 [2021-11-07 01:21:29,960 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-11-07 01:21:29,996 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 53. [2021-11-07 01:21:29,996 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 52 states have (on average 1.1923076923076923) internal successors, (62), 52 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:21:29,997 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 62 transitions. [2021-11-07 01:21:29,998 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 62 transitions. Word has length 43 [2021-11-07 01:21:30,006 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:21:30,006 INFO L470 AbstractCegarLoop]: Abstraction has 53 states and 62 transitions. [2021-11-07 01:21:30,007 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 68 states, 68 states have (on average 1.8235294117647058) internal successors, (124), 68 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:21:30,007 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 62 transitions. [2021-11-07 01:21:30,010 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-07 01:21:30,012 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:21:30,012 INFO L513 BasicCegarLoop]: trace histogram [11, 10, 9, 9, 1, 1, 1, 1, 1] [2021-11-07 01:21:30,056 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-07 01:21:30,235 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable366 [2021-11-07 01:21:30,236 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:21:30,236 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:21:30,236 INFO L85 PathProgramCache]: Analyzing trace with hash -1857533990, now seen corresponding path program 12 times [2021-11-07 01:21:30,236 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:21:30,236 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1187388870] [2021-11-07 01:21:30,236 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:21:30,236 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:21:30,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:21:30,526 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 45 proven. 147 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:21:30,526 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:21:30,526 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1187388870] [2021-11-07 01:21:30,526 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1187388870] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:21:30,527 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [296353988] [2021-11-07 01:21:30,527 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-07 01:21:30,527 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:21:30,527 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:21:30,529 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:21:30,530 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-07 01:21:31,155 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-07 01:21:31,155 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:21:31,156 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-07 01:21:31,158 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:21:31,574 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 0 proven. 192 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:21:31,574 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:21:32,010 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 0 proven. 192 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:21:32,011 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [296353988] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:21:32,011 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1357154756] [2021-11-07 01:21:32,012 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-07 01:21:32,013 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 01:21:32,013 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-07 01:21:32,013 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-07 01:21:32,013 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-07 01:21:32,019 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:32,020 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:21:32,020 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:32,020 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-07 01:21:32,020 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:21:32,021 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:32,021 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-07 01:21:32,022 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 97 [2021-11-07 01:21:32,032 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_21|], 10=[|v_#valid_22|]} [2021-11-07 01:21:32,038 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:21:32,039 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 [2021-11-07 01:21:32,040 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:32,040 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:21:32,041 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:32,041 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:21:32,041 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-07 01:21:32,041 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:32,044 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:32,046 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:21:32,047 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:21:32,048 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:21:32,053 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:21:32,054 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 [2021-11-07 01:21:32,055 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:32,057 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:21:32,057 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:32,058 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:21:32,058 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-07 01:21:32,058 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:32,061 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:32,062 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:32,062 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 79 [2021-11-07 01:21:32,063 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-07 01:21:32,063 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:94, output treesize:79 [2021-11-07 01:21:32,067 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.1 percent of original size [2021-11-07 01:21:32,069 INFO L185 QuantifierPusher]: treesize reduction 5, result has 94.4 percent of original size 85 [2021-11-07 01:21:32,072 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:32,077 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:32,085 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:32,099 INFO L180 QuantifierPusher]: treesize reduction 3, result has 98.7 percent of original size [2021-11-07 01:21:32,102 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 227 [2021-11-07 01:21:32,105 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:32,116 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:32,117 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:32,117 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:32,118 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:32,118 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:32,121 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:32,125 INFO L180 QuantifierPusher]: treesize reduction 24, result has 69.6 percent of original size [2021-11-07 01:21:32,127 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 46 [2021-11-07 01:21:32,128 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:32,131 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:32,134 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:32,140 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:32,142 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 101 [2021-11-07 01:21:32,144 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:32,149 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:32,150 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:32,150 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:32,151 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:32,163 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:32,167 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-07 01:21:32,168 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-07 01:21:32,174 INFO L180 QuantifierPusher]: treesize reduction 25, result has 81.5 percent of original size [2021-11-07 01:21:32,177 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 107 [2021-11-07 01:21:32,179 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:32,187 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:32,188 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:32,189 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:32,190 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:32,191 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:32,191 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:32,192 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:32,193 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:32,196 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:32,200 INFO L180 QuantifierPusher]: treesize reduction 24, result has 81.7 percent of original size [2021-11-07 01:21:32,202 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 102 [2021-11-07 01:21:32,207 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-07 01:21:32,822 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-07 01:21:32,822 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-07 01:21:32,822 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 47 [2021-11-07 01:21:32,823 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [279739445] [2021-11-07 01:21:32,823 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2021-11-07 01:21:32,823 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:21:32,824 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-11-07 01:21:32,825 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=394, Invalid=2362, Unknown=0, NotChecked=0, Total=2756 [2021-11-07 01:21:32,825 INFO L87 Difference]: Start difference. First operand 53 states and 62 transitions. Second operand has 47 states, 47 states have (on average 1.4893617021276595) internal successors, (70), 47 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:21:33,492 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:21:33,492 INFO L93 Difference]: Finished difference Result 90 states and 100 transitions. [2021-11-07 01:21:33,494 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-07 01:21:33,494 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 1.4893617021276595) internal successors, (70), 47 states have internal predecessors, (70), 0 states have call successors, (0), 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 [2021-11-07 01:21:33,494 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:21:33,495 INFO L225 Difference]: With dead ends: 90 [2021-11-07 01:21:33,495 INFO L226 Difference]: Without dead ends: 88 [2021-11-07 01:21:33,496 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 100 SyntacticMatches, 3 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1554 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=907, Invalid=4643, Unknown=0, NotChecked=0, Total=5550 [2021-11-07 01:21:33,496 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2021-11-07 01:21:33,514 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 48. [2021-11-07 01:21:33,514 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 47 states have (on average 1.0425531914893618) internal successors, (49), 47 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:21:33,515 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 49 transitions. [2021-11-07 01:21:33,515 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 49 transitions. Word has length 44 [2021-11-07 01:21:33,516 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:21:33,516 INFO L470 AbstractCegarLoop]: Abstraction has 48 states and 49 transitions. [2021-11-07 01:21:33,516 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 1.4893617021276595) internal successors, (70), 47 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:21:33,516 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 49 transitions. [2021-11-07 01:21:33,517 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-07 01:21:33,517 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:21:33,517 INFO L513 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 1, 1, 1, 1, 1] [2021-11-07 01:21:33,550 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-07 01:21:33,723 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable398,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:21:33,724 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:21:33,724 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:21:33,724 INFO L85 PathProgramCache]: Analyzing trace with hash -1431629180, now seen corresponding path program 13 times [2021-11-07 01:21:33,724 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:21:33,724 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [870427198] [2021-11-07 01:21:33,724 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:21:33,725 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:21:33,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:21:34,603 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 117 proven. 104 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:21:34,603 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:21:34,604 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [870427198] [2021-11-07 01:21:34,604 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [870427198] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:21:34,604 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [731705221] [2021-11-07 01:21:34,604 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-07 01:21:34,604 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:21:34,604 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:21:34,605 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:21:34,606 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-07 01:21:35,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:21:35,316 INFO L263 TraceCheckSpWp]: Trace formula consists of 198 conjuncts, 49 conjunts are in the unsatisfiable core [2021-11-07 01:21:35,322 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:21:36,153 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 0 proven. 221 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:21:36,153 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:21:38,042 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 0 proven. 221 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:21:38,042 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [731705221] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:21:38,042 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [763181331] [2021-11-07 01:21:38,044 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-07 01:21:38,044 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 01:21:38,044 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-07 01:21:38,045 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-07 01:21:38,045 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-07 01:21:38,048 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:38,049 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:21:38,049 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:38,050 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-07 01:21:38,050 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:21:38,050 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:38,051 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-07 01:21:38,052 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 97 [2021-11-07 01:21:38,054 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_22|], 10=[|v_#valid_23|]} [2021-11-07 01:21:38,060 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:21:38,061 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 [2021-11-07 01:21:38,062 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:38,062 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:21:38,063 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:38,063 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:21:38,064 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-07 01:21:38,064 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:38,066 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:38,069 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:21:38,070 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:21:38,071 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:21:38,074 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:21:38,075 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 [2021-11-07 01:21:38,076 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:38,077 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:21:38,078 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:38,078 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:21:38,079 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-07 01:21:38,079 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:38,081 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:38,082 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:38,082 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 79 [2021-11-07 01:21:38,083 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-07 01:21:38,083 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:94, output treesize:79 [2021-11-07 01:21:38,086 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.1 percent of original size [2021-11-07 01:21:38,088 INFO L185 QuantifierPusher]: treesize reduction 5, result has 94.4 percent of original size 85 [2021-11-07 01:21:38,090 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:38,094 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:38,098 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:38,106 INFO L180 QuantifierPusher]: treesize reduction 3, result has 98.7 percent of original size [2021-11-07 01:21:38,109 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 227 [2021-11-07 01:21:38,112 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:38,120 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:38,121 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:38,121 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:38,122 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:38,124 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:38,127 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:38,129 INFO L180 QuantifierPusher]: treesize reduction 24, result has 69.6 percent of original size [2021-11-07 01:21:38,130 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 46 [2021-11-07 01:21:38,131 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:38,133 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:38,136 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:38,140 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:38,152 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 101 [2021-11-07 01:21:38,155 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:38,161 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:38,162 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:38,163 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:38,163 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:38,165 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:38,169 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-07 01:21:38,171 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-07 01:21:38,177 INFO L180 QuantifierPusher]: treesize reduction 25, result has 81.5 percent of original size [2021-11-07 01:21:38,180 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-07 01:21:38,184 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:38,191 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:38,192 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:38,193 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:38,195 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:38,196 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:38,197 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:38,197 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:38,198 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:38,201 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:38,205 INFO L180 QuantifierPusher]: treesize reduction 24, result has 81.7 percent of original size [2021-11-07 01:21:38,208 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 102 [2021-11-07 01:21:38,214 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-07 01:21:38,995 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-07 01:21:38,996 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-07 01:21:38,996 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26, 26] total 63 [2021-11-07 01:21:38,996 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2033611249] [2021-11-07 01:21:38,996 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 63 states [2021-11-07 01:21:38,996 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:21:38,997 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2021-11-07 01:21:38,997 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=609, Invalid=4083, Unknown=0, NotChecked=0, Total=4692 [2021-11-07 01:21:38,998 INFO L87 Difference]: Start difference. First operand 48 states and 49 transitions. Second operand has 63 states, 63 states have (on average 2.0) internal successors, (126), 63 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:21:43,136 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:21:43,137 INFO L93 Difference]: Finished difference Result 132 states and 147 transitions. [2021-11-07 01:21:43,137 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2021-11-07 01:21:43,137 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 63 states have (on average 2.0) internal successors, (126), 63 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 47 [2021-11-07 01:21:43,138 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:21:43,138 INFO L225 Difference]: With dead ends: 132 [2021-11-07 01:21:43,139 INFO L226 Difference]: Without dead ends: 94 [2021-11-07 01:21:43,141 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 214 GetRequests, 97 SyntacticMatches, 2 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3541 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=1766, Invalid=11806, Unknown=0, NotChecked=0, Total=13572 [2021-11-07 01:21:43,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2021-11-07 01:21:43,174 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 63. [2021-11-07 01:21:43,175 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 62 states have (on average 1.2096774193548387) internal successors, (75), 62 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:21:43,175 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 75 transitions. [2021-11-07 01:21:43,176 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 75 transitions. Word has length 47 [2021-11-07 01:21:43,176 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:21:43,176 INFO L470 AbstractCegarLoop]: Abstraction has 63 states and 75 transitions. [2021-11-07 01:21:43,176 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 63 states, 63 states have (on average 2.0) internal successors, (126), 63 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:21:43,176 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 75 transitions. [2021-11-07 01:21:43,177 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-07 01:21:43,177 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:21:43,177 INFO L513 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 1, 1, 1, 1, 1] [2021-11-07 01:21:43,203 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-07 01:21:43,377 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable430 [2021-11-07 01:21:43,378 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:21:43,378 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:21:43,378 INFO L85 PathProgramCache]: Analyzing trace with hash -1237897350, now seen corresponding path program 14 times [2021-11-07 01:21:43,378 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:21:43,378 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [981449193] [2021-11-07 01:21:43,378 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:21:43,379 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:21:43,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:21:44,229 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 145 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:21:44,229 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:21:44,229 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [981449193] [2021-11-07 01:21:44,229 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [981449193] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:21:44,230 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1322036266] [2021-11-07 01:21:44,230 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-07 01:21:44,230 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:21:44,230 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:21:44,233 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:21:44,234 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-07 01:21:45,036 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2021-11-07 01:21:45,037 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:21:45,038 INFO L263 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 42 conjunts are in the unsatisfiable core [2021-11-07 01:21:45,040 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:21:46,437 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 0 proven. 265 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:21:46,437 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:21:48,784 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 0 proven. 265 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:21:48,784 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1322036266] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:21:48,784 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2003863908] [2021-11-07 01:21:48,786 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-07 01:21:48,786 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 01:21:48,786 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-07 01:21:48,787 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-07 01:21:48,787 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-07 01:21:48,796 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:48,796 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:21:48,797 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:48,797 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-07 01:21:48,797 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:21:48,798 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:48,798 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-07 01:21:48,799 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 97 [2021-11-07 01:21:48,801 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_23|], 10=[|v_#valid_24|]} [2021-11-07 01:21:48,806 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:21:48,807 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 [2021-11-07 01:21:48,807 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:48,808 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:21:48,808 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:48,808 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:21:48,809 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-07 01:21:48,809 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:48,810 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:48,813 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:21:48,814 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:21:48,815 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:21:48,818 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:21:48,819 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 [2021-11-07 01:21:48,819 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:48,820 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:21:48,821 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:48,821 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:21:48,821 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-07 01:21:48,822 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:48,823 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:48,824 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:48,824 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 79 [2021-11-07 01:21:48,825 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-07 01:21:48,825 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:94, output treesize:79 [2021-11-07 01:21:48,827 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.1 percent of original size [2021-11-07 01:21:48,829 INFO L185 QuantifierPusher]: treesize reduction 5, result has 94.4 percent of original size 85 [2021-11-07 01:21:48,831 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:48,835 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:48,839 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:48,849 INFO L180 QuantifierPusher]: treesize reduction 3, result has 98.7 percent of original size [2021-11-07 01:21:48,852 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 227 [2021-11-07 01:21:48,856 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:48,867 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:48,867 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:48,868 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:48,868 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:48,869 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:48,874 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:48,877 INFO L180 QuantifierPusher]: treesize reduction 24, result has 69.6 percent of original size [2021-11-07 01:21:48,878 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 46 [2021-11-07 01:21:48,879 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:48,882 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:48,885 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:48,891 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:48,892 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 101 [2021-11-07 01:21:48,894 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:48,899 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:48,900 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:48,901 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:48,901 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:48,902 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:48,905 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-07 01:21:48,906 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-07 01:21:48,910 INFO L180 QuantifierPusher]: treesize reduction 25, result has 81.5 percent of original size [2021-11-07 01:21:48,921 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-07 01:21:48,923 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:48,930 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:48,931 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:48,932 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:48,933 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:48,933 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:48,934 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:48,935 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:48,936 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:48,941 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:48,946 INFO L180 QuantifierPusher]: treesize reduction 24, result has 81.7 percent of original size [2021-11-07 01:21:48,949 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 102 [2021-11-07 01:21:48,956 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-07 01:21:49,749 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-07 01:21:49,749 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-07 01:21:49,749 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28, 28] total 80 [2021-11-07 01:21:49,749 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [452346246] [2021-11-07 01:21:49,750 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 80 states [2021-11-07 01:21:49,750 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:21:49,750 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2021-11-07 01:21:49,752 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=806, Invalid=6504, Unknown=0, NotChecked=0, Total=7310 [2021-11-07 01:21:49,752 INFO L87 Difference]: Start difference. First operand 63 states and 75 transitions. Second operand has 80 states, 80 states have (on average 1.85) internal successors, (148), 80 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:21:52,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:21:52,906 INFO L93 Difference]: Finished difference Result 107 states and 120 transitions. [2021-11-07 01:21:52,906 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-11-07 01:21:52,906 INFO L78 Accepts]: Start accepts. Automaton has has 80 states, 80 states have (on average 1.85) internal successors, (148), 80 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 51 [2021-11-07 01:21:52,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:21:52,907 INFO L225 Difference]: With dead ends: 107 [2021-11-07 01:21:52,907 INFO L226 Difference]: Without dead ends: 66 [2021-11-07 01:21:52,908 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 207 GetRequests, 95 SyntacticMatches, 1 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3318 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=1410, Invalid=11246, Unknown=0, NotChecked=0, Total=12656 [2021-11-07 01:21:52,908 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2021-11-07 01:21:52,936 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 63. [2021-11-07 01:21:52,936 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 62 states have (on average 1.1935483870967742) internal successors, (74), 62 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:21:52,937 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 74 transitions. [2021-11-07 01:21:52,937 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 74 transitions. Word has length 51 [2021-11-07 01:21:52,937 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:21:52,937 INFO L470 AbstractCegarLoop]: Abstraction has 63 states and 74 transitions. [2021-11-07 01:21:52,937 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 80 states, 80 states have (on average 1.85) internal successors, (148), 80 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:21:52,937 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 74 transitions. [2021-11-07 01:21:52,938 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-07 01:21:52,938 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:21:52,938 INFO L513 BasicCegarLoop]: trace histogram [13, 12, 11, 11, 1, 1, 1, 1, 1] [2021-11-07 01:21:52,963 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-07 01:21:53,138 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable462,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:21:53,139 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:21:53,139 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:21:53,139 INFO L85 PathProgramCache]: Analyzing trace with hash 1541753754, now seen corresponding path program 15 times [2021-11-07 01:21:53,139 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:21:53,140 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1527676435] [2021-11-07 01:21:53,140 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:21:53,140 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:21:53,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:21:53,534 INFO L134 CoverageAnalysis]: Checked inductivity of 278 backedges. 66 proven. 212 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:21:53,534 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:21:53,534 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1527676435] [2021-11-07 01:21:53,534 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1527676435] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:21:53,534 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [452049492] [2021-11-07 01:21:53,534 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-07 01:21:53,534 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:21:53,535 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:21:53,535 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:21:53,537 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-07 01:21:54,446 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-07 01:21:54,446 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:21:54,448 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 42 conjunts are in the unsatisfiable core [2021-11-07 01:21:54,449 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:21:55,004 INFO L134 CoverageAnalysis]: Checked inductivity of 278 backedges. 0 proven. 278 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:21:55,004 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:21:55,535 INFO L134 CoverageAnalysis]: Checked inductivity of 278 backedges. 0 proven. 278 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:21:55,535 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [452049492] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:21:55,536 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1897038307] [2021-11-07 01:21:55,537 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-07 01:21:55,537 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 01:21:55,537 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-07 01:21:55,538 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-07 01:21:55,538 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-07 01:21:55,548 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:55,549 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:21:55,550 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:55,550 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-07 01:21:55,551 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:21:55,551 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:55,552 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-07 01:21:55,553 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 97 [2021-11-07 01:21:55,554 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_24|], 10=[|v_#valid_25|]} [2021-11-07 01:21:55,560 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:21:55,561 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 [2021-11-07 01:21:55,562 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:55,562 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:21:55,563 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:55,563 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:21:55,563 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-07 01:21:55,564 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:55,566 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:55,568 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:21:55,570 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:21:55,570 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:21:55,574 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:21:55,575 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 [2021-11-07 01:21:55,576 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:55,577 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:21:55,578 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:55,579 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:21:55,579 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-07 01:21:55,579 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:55,581 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:55,582 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:55,583 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 79 [2021-11-07 01:21:55,584 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-07 01:21:55,584 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:94, output treesize:79 [2021-11-07 01:21:55,590 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.1 percent of original size [2021-11-07 01:21:55,592 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-07 01:21:55,594 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:55,600 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:55,604 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:55,614 INFO L180 QuantifierPusher]: treesize reduction 3, result has 98.7 percent of original size [2021-11-07 01:21:55,617 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 229 [2021-11-07 01:21:55,620 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:55,632 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:55,633 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:55,633 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:55,634 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:55,634 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:55,639 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:55,642 INFO L180 QuantifierPusher]: treesize reduction 24, result has 69.6 percent of original size [2021-11-07 01:21:55,643 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 46 [2021-11-07 01:21:55,645 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:55,647 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:55,650 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:55,655 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:21:55,657 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 101 [2021-11-07 01:21:55,659 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:55,664 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:55,669 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:55,671 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:55,672 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:55,673 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:55,675 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-07 01:21:55,676 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-07 01:21:55,680 INFO L180 QuantifierPusher]: treesize reduction 25, result has 81.5 percent of original size [2021-11-07 01:21:55,682 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-07 01:21:55,684 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:55,689 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:55,690 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:55,691 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:55,691 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:55,692 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:55,693 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:55,693 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:55,694 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:55,703 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:21:55,709 INFO L180 QuantifierPusher]: treesize reduction 24, result has 81.7 percent of original size [2021-11-07 01:21:55,711 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 102 [2021-11-07 01:21:55,716 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-07 01:21:56,405 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-07 01:21:56,405 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-07 01:21:56,406 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 55 [2021-11-07 01:21:56,406 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [452597875] [2021-11-07 01:21:56,407 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2021-11-07 01:21:56,407 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:21:56,408 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-11-07 01:21:56,408 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=525, Invalid=3135, Unknown=0, NotChecked=0, Total=3660 [2021-11-07 01:21:56,408 INFO L87 Difference]: Start difference. First operand 63 states and 74 transitions. Second operand has 55 states, 55 states have (on average 1.490909090909091) internal successors, (82), 55 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:21:57,213 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:21:57,213 INFO L93 Difference]: Finished difference Result 106 states and 118 transitions. [2021-11-07 01:21:57,213 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-11-07 01:21:57,214 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 1.490909090909091) internal successors, (82), 55 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 52 [2021-11-07 01:21:57,214 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:21:57,214 INFO L225 Difference]: With dead ends: 106 [2021-11-07 01:21:57,215 INFO L226 Difference]: Without dead ends: 104 [2021-11-07 01:21:57,215 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 208 GetRequests, 120 SyntacticMatches, 3 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2115 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1223, Invalid=6259, Unknown=0, NotChecked=0, Total=7482 [2021-11-07 01:21:57,216 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2021-11-07 01:21:57,240 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 56. [2021-11-07 01:21:57,241 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 55 states have (on average 1.0363636363636364) internal successors, (57), 55 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) [2021-11-07 01:21:57,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 57 transitions. [2021-11-07 01:21:57,241 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 57 transitions. Word has length 52 [2021-11-07 01:21:57,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:21:57,242 INFO L470 AbstractCegarLoop]: Abstraction has 56 states and 57 transitions. [2021-11-07 01:21:57,242 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 55 states have (on average 1.490909090909091) internal successors, (82), 55 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:21:57,242 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 57 transitions. [2021-11-07 01:21:57,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-07 01:21:57,243 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:21:57,243 INFO L513 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 1, 1, 1, 1, 1] [2021-11-07 01:21:57,269 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-07 01:21:57,443 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable494,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:21:57,443 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:21:57,444 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:21:57,444 INFO L85 PathProgramCache]: Analyzing trace with hash 10647236, now seen corresponding path program 16 times [2021-11-07 01:21:57,444 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:21:57,444 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1567385087] [2021-11-07 01:21:57,444 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:21:57,444 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:21:57,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:21:58,445 INFO L134 CoverageAnalysis]: Checked inductivity of 313 backedges. 176 proven. 137 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:21:58,445 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:21:58,446 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1567385087] [2021-11-07 01:21:58,446 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1567385087] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:21:58,446 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1362294962] [2021-11-07 01:21:58,446 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-07 01:21:58,446 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:21:58,446 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:21:58,447 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:21:58,449 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-07 01:21:59,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:21:59,427 INFO L263 TraceCheckSpWp]: Trace formula consists of 228 conjuncts, 57 conjunts are in the unsatisfiable core [2021-11-07 01:21:59,428 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:22:00,465 INFO L134 CoverageAnalysis]: Checked inductivity of 313 backedges. 0 proven. 313 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:22:00,465 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:22:02,822 INFO L134 CoverageAnalysis]: Checked inductivity of 313 backedges. 0 proven. 313 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:22:02,822 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1362294962] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:22:02,822 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2010188154] [2021-11-07 01:22:02,823 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-07 01:22:02,823 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 01:22:02,824 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-07 01:22:02,824 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-07 01:22:02,824 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-07 01:22:02,832 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:22:02,833 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:22:02,834 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:22:02,834 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-07 01:22:02,835 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:22:02,835 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:22:02,836 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-07 01:22:02,837 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 97 [2021-11-07 01:22:02,841 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_25|], 10=[|v_#valid_26|]} [2021-11-07 01:22:02,847 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:22:02,848 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 [2021-11-07 01:22:02,849 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:22:02,850 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:22:02,859 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:22:02,859 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:22:02,859 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-07 01:22:02,860 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:02,861 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:22:02,864 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:22:02,864 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:22:02,865 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:22:02,868 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:22:02,869 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 [2021-11-07 01:22:02,870 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:22:02,872 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:22:02,873 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:22:02,873 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:22:02,874 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-07 01:22:02,874 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:02,876 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:22:02,877 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:22:02,878 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 79 [2021-11-07 01:22:02,879 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-07 01:22:02,879 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:94, output treesize:79 [2021-11-07 01:22:02,891 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.1 percent of original size [2021-11-07 01:22:02,898 INFO L185 QuantifierPusher]: treesize reduction 5, result has 94.4 percent of original size 85 [2021-11-07 01:22:02,901 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:02,907 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:02,913 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:02,929 INFO L180 QuantifierPusher]: treesize reduction 3, result has 98.7 percent of original size [2021-11-07 01:22:02,933 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 227 [2021-11-07 01:22:02,938 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:02,974 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:02,975 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:02,976 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:02,977 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:02,977 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:02,980 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:02,984 INFO L180 QuantifierPusher]: treesize reduction 24, result has 69.6 percent of original size [2021-11-07 01:22:02,985 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 46 [2021-11-07 01:22:02,987 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:02,992 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:02,996 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:03,005 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:22:03,007 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 101 [2021-11-07 01:22:03,010 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:03,016 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:03,017 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:03,017 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:03,018 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:03,020 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:03,023 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-07 01:22:03,025 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-07 01:22:03,030 INFO L180 QuantifierPusher]: treesize reduction 25, result has 81.5 percent of original size [2021-11-07 01:22:03,032 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 107 [2021-11-07 01:22:03,035 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:03,040 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:03,041 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:03,041 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:03,042 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:03,042 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:03,043 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:03,043 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:03,044 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:03,050 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:03,054 INFO L180 QuantifierPusher]: treesize reduction 24, result has 81.7 percent of original size [2021-11-07 01:22:03,056 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 102 [2021-11-07 01:22:03,061 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-07 01:22:03,892 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-07 01:22:03,892 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-07 01:22:03,892 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30, 30] total 73 [2021-11-07 01:22:03,893 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1601168047] [2021-11-07 01:22:03,893 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 73 states [2021-11-07 01:22:03,893 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:22:03,894 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2021-11-07 01:22:03,894 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=802, Invalid=5360, Unknown=0, NotChecked=0, Total=6162 [2021-11-07 01:22:03,895 INFO L87 Difference]: Start difference. First operand 56 states and 57 transitions. Second operand has 73 states, 73 states have (on average 2.0273972602739727) internal successors, (148), 73 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:22:09,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:22:09,619 INFO L93 Difference]: Finished difference Result 154 states and 171 transitions. [2021-11-07 01:22:09,620 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2021-11-07 01:22:09,620 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 73 states have (on average 2.0273972602739727) internal successors, (148), 73 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 55 [2021-11-07 01:22:09,620 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:22:09,621 INFO L225 Difference]: With dead ends: 154 [2021-11-07 01:22:09,621 INFO L226 Difference]: Without dead ends: 110 [2021-11-07 01:22:09,622 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 250 GetRequests, 115 SyntacticMatches, 2 SemanticMatches, 133 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4753 ImplicationChecksByTransitivity, 7.8s TimeCoverageRelationStatistics Valid=2345, Invalid=15745, Unknown=0, NotChecked=0, Total=18090 [2021-11-07 01:22:09,622 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2021-11-07 01:22:09,662 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 73. [2021-11-07 01:22:09,663 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 72 states have (on average 1.2083333333333333) internal successors, (87), 72 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) [2021-11-07 01:22:09,664 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 87 transitions. [2021-11-07 01:22:09,664 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 87 transitions. Word has length 55 [2021-11-07 01:22:09,664 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:22:09,664 INFO L470 AbstractCegarLoop]: Abstraction has 73 states and 87 transitions. [2021-11-07 01:22:09,665 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 73 states, 73 states have (on average 2.0273972602739727) internal successors, (148), 73 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:22:09,665 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 87 transitions. [2021-11-07 01:22:09,666 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-11-07 01:22:09,666 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:22:09,666 INFO L513 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 1, 1, 1, 1, 1] [2021-11-07 01:22:09,694 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-07 01:22:09,875 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable526 [2021-11-07 01:22:09,876 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:22:09,876 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:22:09,876 INFO L85 PathProgramCache]: Analyzing trace with hash -1308327110, now seen corresponding path program 17 times [2021-11-07 01:22:09,876 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:22:09,876 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1266369683] [2021-11-07 01:22:09,876 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:22:09,877 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:22:09,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:22:10,994 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 210 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:22:10,994 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:22:10,994 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1266369683] [2021-11-07 01:22:10,994 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1266369683] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:22:10,994 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [35850023] [2021-11-07 01:22:10,994 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-07 01:22:10,995 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:22:10,995 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:22:10,996 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:22:10,997 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-07 01:22:12,121 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2021-11-07 01:22:12,121 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:22:12,123 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 48 conjunts are in the unsatisfiable core [2021-11-07 01:22:12,125 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:22:13,825 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 0 proven. 365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:22:13,825 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:22:16,613 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 0 proven. 365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:22:16,613 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [35850023] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:22:16,613 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [516828703] [2021-11-07 01:22:16,615 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-07 01:22:16,615 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 01:22:16,615 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-07 01:22:16,616 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-07 01:22:16,616 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-07 01:22:16,620 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:22:16,621 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:22:16,621 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:22:16,622 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-07 01:22:16,622 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:22:16,622 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:22:16,623 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-07 01:22:16,624 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 97 [2021-11-07 01:22:16,628 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_26|], 10=[|v_#valid_27|]} [2021-11-07 01:22:16,636 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:22:16,637 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 [2021-11-07 01:22:16,638 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:22:16,638 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:22:16,639 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:22:16,639 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:22:16,640 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-07 01:22:16,640 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:16,642 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:22:16,645 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:22:16,646 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:22:16,647 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:22:16,650 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:22:16,654 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 [2021-11-07 01:22:16,655 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:22:16,656 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:22:16,657 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:22:16,657 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:22:16,657 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-07 01:22:16,658 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:16,659 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:22:16,660 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:22:16,660 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 79 [2021-11-07 01:22:16,661 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-07 01:22:16,661 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:94, output treesize:79 [2021-11-07 01:22:16,663 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.1 percent of original size [2021-11-07 01:22:16,665 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-07 01:22:16,666 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:16,670 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:16,674 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:16,684 INFO L180 QuantifierPusher]: treesize reduction 3, result has 98.7 percent of original size [2021-11-07 01:22:16,687 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 229 [2021-11-07 01:22:16,690 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:16,701 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:16,702 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:16,703 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:16,703 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:16,704 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:16,710 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:16,712 INFO L180 QuantifierPusher]: treesize reduction 24, result has 69.6 percent of original size [2021-11-07 01:22:16,713 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 46 [2021-11-07 01:22:16,715 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:16,717 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:16,720 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:16,725 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:22:16,727 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 101 [2021-11-07 01:22:16,729 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:16,733 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:16,734 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:16,735 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:16,735 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:16,747 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:16,751 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-07 01:22:16,752 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-07 01:22:16,758 INFO L180 QuantifierPusher]: treesize reduction 25, result has 81.5 percent of original size [2021-11-07 01:22:16,760 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 107 [2021-11-07 01:22:16,763 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:16,771 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:16,772 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:16,773 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:16,773 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:16,774 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:16,775 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:16,775 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:16,776 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:16,777 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:16,781 INFO L180 QuantifierPusher]: treesize reduction 24, result has 81.7 percent of original size [2021-11-07 01:22:16,783 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 102 [2021-11-07 01:22:16,788 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-07 01:22:17,711 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-07 01:22:17,711 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-07 01:22:17,711 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 32, 32] total 92 [2021-11-07 01:22:17,711 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [145601991] [2021-11-07 01:22:17,712 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 92 states [2021-11-07 01:22:17,712 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:22:17,713 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 92 interpolants. [2021-11-07 01:22:17,714 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1044, Invalid=8462, Unknown=0, NotChecked=0, Total=9506 [2021-11-07 01:22:17,715 INFO L87 Difference]: Start difference. First operand 73 states and 87 transitions. Second operand has 92 states, 92 states have (on average 1.8695652173913044) internal successors, (172), 92 states have internal predecessors, (172), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:22:22,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:22:22,143 INFO L93 Difference]: Finished difference Result 123 states and 138 transitions. [2021-11-07 01:22:22,144 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-11-07 01:22:22,144 INFO L78 Accepts]: Start accepts. Automaton has has 92 states, 92 states have (on average 1.8695652173913044) internal successors, (172), 92 states have internal predecessors, (172), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 59 [2021-11-07 01:22:22,144 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:22:22,145 INFO L225 Difference]: With dead ends: 123 [2021-11-07 01:22:22,145 INFO L226 Difference]: Without dead ends: 76 [2021-11-07 01:22:22,147 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 111 SyntacticMatches, 1 SemanticMatches, 127 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4344 ImplicationChecksByTransitivity, 8.0s TimeCoverageRelationStatistics Valid=1828, Invalid=14684, Unknown=0, NotChecked=0, Total=16512 [2021-11-07 01:22:22,147 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2021-11-07 01:22:22,196 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 73. [2021-11-07 01:22:22,196 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 72 states have (on average 1.1944444444444444) internal successors, (86), 72 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:22:22,197 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 86 transitions. [2021-11-07 01:22:22,197 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 86 transitions. Word has length 59 [2021-11-07 01:22:22,197 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:22:22,197 INFO L470 AbstractCegarLoop]: Abstraction has 73 states and 86 transitions. [2021-11-07 01:22:22,197 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 92 states, 92 states have (on average 1.8695652173913044) internal successors, (172), 92 states have internal predecessors, (172), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:22:22,198 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 86 transitions. [2021-11-07 01:22:22,198 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-07 01:22:22,198 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:22:22,198 INFO L513 BasicCegarLoop]: trace histogram [15, 14, 13, 13, 1, 1, 1, 1, 1] [2021-11-07 01:22:22,226 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-07 01:22:22,398 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable558 [2021-11-07 01:22:22,399 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:22:22,399 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:22:22,399 INFO L85 PathProgramCache]: Analyzing trace with hash -832274598, now seen corresponding path program 18 times [2021-11-07 01:22:22,399 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:22:22,399 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1511615124] [2021-11-07 01:22:22,400 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:22:22,400 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:22:22,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:22:22,872 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 91 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:22:22,872 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:22:22,872 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1511615124] [2021-11-07 01:22:22,872 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1511615124] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:22:22,872 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1679075572] [2021-11-07 01:22:22,872 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-07 01:22:22,872 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:22:22,873 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:22:22,873 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:22:22,875 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-07 01:22:24,115 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-07 01:22:24,115 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:22:24,117 INFO L263 TraceCheckSpWp]: Trace formula consists of 248 conjuncts, 48 conjunts are in the unsatisfiable core [2021-11-07 01:22:24,119 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:22:24,807 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:22:24,807 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:22:25,506 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:22:25,507 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1679075572] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:22:25,507 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [398081323] [2021-11-07 01:22:25,508 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-07 01:22:25,508 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 01:22:25,508 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-07 01:22:25,508 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-07 01:22:25,508 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-07 01:22:25,511 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:22:25,512 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:22:25,512 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:22:25,512 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-07 01:22:25,513 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:22:25,513 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:22:25,513 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-07 01:22:25,514 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 97 [2021-11-07 01:22:25,516 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_27|], 10=[|v_#valid_28|]} [2021-11-07 01:22:25,520 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:22:25,521 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 [2021-11-07 01:22:25,521 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:22:25,524 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:22:25,524 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:22:25,524 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:22:25,525 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-07 01:22:25,525 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:25,526 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:22:25,528 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:22:25,529 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:22:25,530 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:22:25,534 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:22:25,535 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 [2021-11-07 01:22:25,536 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:22:25,537 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:22:25,537 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:22:25,538 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:22:25,538 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-07 01:22:25,538 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:25,539 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:22:25,540 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:22:25,540 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 79 [2021-11-07 01:22:25,541 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-07 01:22:25,541 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:94, output treesize:79 [2021-11-07 01:22:25,543 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.1 percent of original size [2021-11-07 01:22:25,545 INFO L185 QuantifierPusher]: treesize reduction 5, result has 94.4 percent of original size 85 [2021-11-07 01:22:25,547 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:25,550 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:25,554 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:25,563 INFO L180 QuantifierPusher]: treesize reduction 3, result has 98.7 percent of original size [2021-11-07 01:22:25,566 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 227 [2021-11-07 01:22:25,569 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:25,580 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:25,580 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:25,581 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:25,582 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:25,583 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:25,589 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:25,593 INFO L180 QuantifierPusher]: treesize reduction 24, result has 69.6 percent of original size [2021-11-07 01:22:25,595 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 46 [2021-11-07 01:22:25,597 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:25,601 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:25,605 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:25,613 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:22:25,616 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 101 [2021-11-07 01:22:25,618 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:25,626 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:25,627 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:25,628 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:25,628 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:25,630 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:25,633 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-07 01:22:25,635 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-07 01:22:25,641 INFO L180 QuantifierPusher]: treesize reduction 25, result has 81.5 percent of original size [2021-11-07 01:22:25,643 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-07 01:22:25,646 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:25,654 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:25,655 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:25,656 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:25,656 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:25,657 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:25,658 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:25,659 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:25,659 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:25,662 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:25,667 INFO L180 QuantifierPusher]: treesize reduction 24, result has 81.7 percent of original size [2021-11-07 01:22:25,670 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 102 [2021-11-07 01:22:25,677 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-07 01:22:26,468 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-07 01:22:26,469 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-07 01:22:26,469 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 63 [2021-11-07 01:22:26,469 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1638172598] [2021-11-07 01:22:26,470 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 63 states [2021-11-07 01:22:26,470 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:22:26,471 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2021-11-07 01:22:26,472 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=676, Invalid=4016, Unknown=0, NotChecked=0, Total=4692 [2021-11-07 01:22:26,472 INFO L87 Difference]: Start difference. First operand 73 states and 86 transitions. Second operand has 63 states, 63 states have (on average 1.492063492063492) internal successors, (94), 63 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:22:27,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:22:27,620 INFO L93 Difference]: Finished difference Result 122 states and 136 transitions. [2021-11-07 01:22:27,620 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-11-07 01:22:27,621 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 63 states have (on average 1.492063492063492) internal successors, (94), 63 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2021-11-07 01:22:27,621 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:22:27,622 INFO L225 Difference]: With dead ends: 122 [2021-11-07 01:22:27,622 INFO L226 Difference]: Without dead ends: 120 [2021-11-07 01:22:27,623 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 140 SyntacticMatches, 3 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2760 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=1587, Invalid=8115, Unknown=0, NotChecked=0, Total=9702 [2021-11-07 01:22:27,624 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2021-11-07 01:22:27,662 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 64. [2021-11-07 01:22:27,663 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 63 states have (on average 1.0317460317460319) internal successors, (65), 63 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:22:27,663 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 65 transitions. [2021-11-07 01:22:27,663 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 65 transitions. Word has length 60 [2021-11-07 01:22:27,663 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:22:27,663 INFO L470 AbstractCegarLoop]: Abstraction has 64 states and 65 transitions. [2021-11-07 01:22:27,664 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 63 states, 63 states have (on average 1.492063492063492) internal successors, (94), 63 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:22:27,664 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 65 transitions. [2021-11-07 01:22:27,664 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-11-07 01:22:27,664 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:22:27,664 INFO L513 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 1, 1, 1, 1, 1] [2021-11-07 01:22:27,696 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-11-07 01:22:27,865 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable590 [2021-11-07 01:22:27,865 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:22:27,865 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:22:27,865 INFO L85 PathProgramCache]: Analyzing trace with hash 558476036, now seen corresponding path program 19 times [2021-11-07 01:22:27,866 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:22:27,866 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [640987875] [2021-11-07 01:22:27,866 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:22:27,866 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:22:27,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:22:29,206 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 247 proven. 174 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:22:29,206 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:22:29,206 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [640987875] [2021-11-07 01:22:29,206 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [640987875] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:22:29,206 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [268232210] [2021-11-07 01:22:29,206 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-07 01:22:29,206 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:22:29,207 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:22:29,207 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:22:29,209 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-07 01:22:30,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:22:30,488 INFO L263 TraceCheckSpWp]: Trace formula consists of 258 conjuncts, 65 conjunts are in the unsatisfiable core [2021-11-07 01:22:30,489 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:22:31,783 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 0 proven. 421 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:22:31,783 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:22:34,984 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 0 proven. 421 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:22:34,984 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [268232210] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:22:34,984 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2079462789] [2021-11-07 01:22:34,985 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-07 01:22:34,985 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 01:22:34,986 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-07 01:22:34,986 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-07 01:22:34,986 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-07 01:22:34,988 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:22:34,989 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:22:34,989 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:22:34,990 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-07 01:22:34,990 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:22:34,990 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:22:34,991 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-07 01:22:34,991 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 97 [2021-11-07 01:22:34,994 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_28|], 10=[|v_#valid_29|]} [2021-11-07 01:22:35,000 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:22:35,002 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 [2021-11-07 01:22:35,002 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:22:35,002 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:22:35,003 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:22:35,003 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:22:35,003 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-07 01:22:35,004 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:35,005 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:22:35,008 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:22:35,008 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:22:35,009 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:22:35,026 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:22:35,028 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 [2021-11-07 01:22:35,029 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:22:35,030 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:22:35,031 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:22:35,031 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:22:35,032 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-07 01:22:35,032 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:35,033 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:22:35,034 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:22:35,034 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 79 [2021-11-07 01:22:35,035 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-07 01:22:35,035 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:94, output treesize:79 [2021-11-07 01:22:35,039 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.1 percent of original size [2021-11-07 01:22:35,058 INFO L185 QuantifierPusher]: treesize reduction 5, result has 94.4 percent of original size 85 [2021-11-07 01:22:35,061 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:35,067 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:35,073 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:35,088 INFO L180 QuantifierPusher]: treesize reduction 3, result has 98.7 percent of original size [2021-11-07 01:22:35,092 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 227 [2021-11-07 01:22:35,097 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:35,114 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:35,115 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:35,116 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:35,117 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:35,118 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:35,121 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:35,124 INFO L180 QuantifierPusher]: treesize reduction 24, result has 69.6 percent of original size [2021-11-07 01:22:35,126 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 46 [2021-11-07 01:22:35,128 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:35,132 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:35,137 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:35,145 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:22:35,148 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 101 [2021-11-07 01:22:35,150 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:35,158 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:35,160 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:35,161 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:35,162 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:35,164 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:35,167 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-07 01:22:35,169 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-07 01:22:35,180 INFO L180 QuantifierPusher]: treesize reduction 25, result has 81.5 percent of original size [2021-11-07 01:22:35,183 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 107 [2021-11-07 01:22:35,185 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:35,193 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:35,194 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:35,195 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:35,196 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:35,196 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:35,197 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:35,198 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:35,199 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:35,204 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:35,210 INFO L180 QuantifierPusher]: treesize reduction 24, result has 81.7 percent of original size [2021-11-07 01:22:35,212 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 102 [2021-11-07 01:22:35,220 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-07 01:22:36,195 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-07 01:22:36,195 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-07 01:22:36,195 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 34, 34] total 83 [2021-11-07 01:22:36,195 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1772159315] [2021-11-07 01:22:36,196 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 83 states [2021-11-07 01:22:36,196 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:22:36,197 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2021-11-07 01:22:36,197 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1023, Invalid=6809, Unknown=0, NotChecked=0, Total=7832 [2021-11-07 01:22:36,197 INFO L87 Difference]: Start difference. First operand 64 states and 65 transitions. Second operand has 83 states, 83 states have (on average 2.0481927710843375) internal successors, (170), 83 states have internal predecessors, (170), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:22:43,473 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:22:43,473 INFO L93 Difference]: Finished difference Result 176 states and 195 transitions. [2021-11-07 01:22:43,473 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2021-11-07 01:22:43,474 INFO L78 Accepts]: Start accepts. Automaton has has 83 states, 83 states have (on average 2.0481927710843375) internal successors, (170), 83 states have internal predecessors, (170), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 63 [2021-11-07 01:22:43,474 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:22:43,475 INFO L225 Difference]: With dead ends: 176 [2021-11-07 01:22:43,475 INFO L226 Difference]: Without dead ends: 126 [2021-11-07 01:22:43,476 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 286 GetRequests, 133 SyntacticMatches, 2 SemanticMatches, 151 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6141 ImplicationChecksByTransitivity, 10.0s TimeCoverageRelationStatistics Valid=3008, Invalid=20248, Unknown=0, NotChecked=0, Total=23256 [2021-11-07 01:22:43,476 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2021-11-07 01:22:43,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 83. [2021-11-07 01:22:43,538 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 82 states have (on average 1.2073170731707317) internal successors, (99), 82 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) [2021-11-07 01:22:43,538 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 99 transitions. [2021-11-07 01:22:43,539 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 99 transitions. Word has length 63 [2021-11-07 01:22:43,539 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:22:43,539 INFO L470 AbstractCegarLoop]: Abstraction has 83 states and 99 transitions. [2021-11-07 01:22:43,539 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 83 states, 83 states have (on average 2.0481927710843375) internal successors, (170), 83 states have internal predecessors, (170), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:22:43,540 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 99 transitions. [2021-11-07 01:22:43,540 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-07 01:22:43,540 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:22:43,540 INFO L513 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 1, 1, 1, 1, 1] [2021-11-07 01:22:43,572 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-07 01:22:43,741 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable622,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:22:43,741 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:22:43,741 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:22:43,742 INFO L85 PathProgramCache]: Analyzing trace with hash 1798309626, now seen corresponding path program 20 times [2021-11-07 01:22:43,742 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:22:43,742 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1924046704] [2021-11-07 01:22:43,742 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:22:43,742 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:22:43,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:22:45,059 INFO L134 CoverageAnalysis]: Checked inductivity of 481 backedges. 287 proven. 194 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:22:45,059 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:22:45,059 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1924046704] [2021-11-07 01:22:45,059 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1924046704] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:22:45,059 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [269763803] [2021-11-07 01:22:45,059 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-07 01:22:45,059 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:22:45,060 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:22:45,060 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:22:45,061 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-07 01:22:46,525 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2021-11-07 01:22:46,525 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:22:46,527 INFO L263 TraceCheckSpWp]: Trace formula consists of 273 conjuncts, 54 conjunts are in the unsatisfiable core [2021-11-07 01:22:46,529 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:22:48,669 INFO L134 CoverageAnalysis]: Checked inductivity of 481 backedges. 0 proven. 481 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:22:48,669 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:22:52,157 INFO L134 CoverageAnalysis]: Checked inductivity of 481 backedges. 0 proven. 481 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:22:52,157 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [269763803] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:22:52,158 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1648779299] [2021-11-07 01:22:52,159 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-07 01:22:52,160 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 01:22:52,160 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-07 01:22:52,160 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-07 01:22:52,160 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-07 01:22:52,163 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:22:52,163 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:22:52,164 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:22:52,164 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-07 01:22:52,164 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:22:52,165 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:22:52,165 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-07 01:22:52,166 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 97 [2021-11-07 01:22:52,169 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_29|], 10=[|v_#valid_30|]} [2021-11-07 01:22:52,174 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:22:52,175 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 [2021-11-07 01:22:52,176 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:22:52,176 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:22:52,176 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:22:52,177 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:22:52,177 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-07 01:22:52,177 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:52,179 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:22:52,181 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:22:52,182 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:22:52,183 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:22:52,198 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:22:52,200 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 [2021-11-07 01:22:52,201 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:22:52,202 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:22:52,203 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:22:52,204 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:22:52,204 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-07 01:22:52,204 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:52,206 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:22:52,207 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:22:52,208 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 79 [2021-11-07 01:22:52,208 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-07 01:22:52,209 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:94, output treesize:79 [2021-11-07 01:22:52,211 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.1 percent of original size [2021-11-07 01:22:52,213 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-07 01:22:52,216 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:52,223 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:52,231 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:52,250 INFO L180 QuantifierPusher]: treesize reduction 3, result has 98.7 percent of original size [2021-11-07 01:22:52,256 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 229 [2021-11-07 01:22:52,260 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:52,283 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:52,284 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:52,285 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:52,286 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:52,286 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:52,289 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:52,294 INFO L180 QuantifierPusher]: treesize reduction 24, result has 69.6 percent of original size [2021-11-07 01:22:52,296 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 46 [2021-11-07 01:22:52,298 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:52,303 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:52,308 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:52,319 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:22:52,322 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 101 [2021-11-07 01:22:52,325 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:52,335 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:52,336 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:52,337 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:52,338 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:52,340 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:52,345 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-07 01:22:52,346 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-07 01:22:52,353 INFO L180 QuantifierPusher]: treesize reduction 25, result has 81.5 percent of original size [2021-11-07 01:22:52,356 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-07 01:22:52,359 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:52,369 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:52,370 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:52,371 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:52,372 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:52,373 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:52,374 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:52,375 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:52,376 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:52,379 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:22:52,386 INFO L180 QuantifierPusher]: treesize reduction 24, result has 81.7 percent of original size [2021-11-07 01:22:52,389 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 102 [2021-11-07 01:22:52,397 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-07 01:22:53,372 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-07 01:22:53,372 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-07 01:22:53,372 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 36, 36] total 104 [2021-11-07 01:22:53,372 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1438837184] [2021-11-07 01:22:53,373 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 104 states [2021-11-07 01:22:53,373 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:22:53,373 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 104 interpolants. [2021-11-07 01:22:53,374 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1314, Invalid=10676, Unknown=0, NotChecked=0, Total=11990 [2021-11-07 01:22:53,374 INFO L87 Difference]: Start difference. First operand 83 states and 99 transitions. Second operand has 104 states, 104 states have (on average 1.8846153846153846) internal successors, (196), 104 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) [2021-11-07 01:22:58,998 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:22:58,998 INFO L93 Difference]: Finished difference Result 139 states and 156 transitions. [2021-11-07 01:22:58,999 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-11-07 01:22:58,999 INFO L78 Accepts]: Start accepts. Automaton has has 104 states, 104 states have (on average 1.8846153846153846) internal successors, (196), 104 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 67 [2021-11-07 01:22:58,999 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:22:59,000 INFO L225 Difference]: With dead ends: 139 [2021-11-07 01:22:59,000 INFO L226 Difference]: Without dead ends: 86 [2021-11-07 01:22:59,001 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 271 GetRequests, 127 SyntacticMatches, 1 SemanticMatches, 143 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5506 ImplicationChecksByTransitivity, 10.3s TimeCoverageRelationStatistics Valid=2302, Invalid=18578, Unknown=0, NotChecked=0, Total=20880 [2021-11-07 01:22:59,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2021-11-07 01:22:59,067 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 83. [2021-11-07 01:22:59,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 82 states have (on average 1.1951219512195121) internal successors, (98), 82 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:22:59,068 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 98 transitions. [2021-11-07 01:22:59,068 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 98 transitions. Word has length 67 [2021-11-07 01:22:59,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:22:59,068 INFO L470 AbstractCegarLoop]: Abstraction has 83 states and 98 transitions. [2021-11-07 01:22:59,068 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 104 states, 104 states have (on average 1.8846153846153846) internal successors, (196), 104 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) [2021-11-07 01:22:59,068 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 98 transitions. [2021-11-07 01:22:59,069 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-07 01:22:59,069 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:22:59,069 INFO L513 BasicCegarLoop]: trace histogram [17, 16, 15, 15, 1, 1, 1, 1, 1] [2021-11-07 01:22:59,129 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2021-11-07 01:22:59,295 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable654,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:22:59,296 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:22:59,296 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:22:59,296 INFO L85 PathProgramCache]: Analyzing trace with hash -1637752038, now seen corresponding path program 21 times [2021-11-07 01:22:59,296 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:22:59,296 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1055163257] [2021-11-07 01:22:59,296 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:22:59,297 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:22:59,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:22:59,918 INFO L134 CoverageAnalysis]: Checked inductivity of 498 backedges. 120 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:22:59,918 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:22:59,919 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1055163257] [2021-11-07 01:22:59,919 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1055163257] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:22:59,919 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1425968304] [2021-11-07 01:22:59,919 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-07 01:22:59,919 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:22:59,919 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:22:59,921 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:22:59,939 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-07 01:23:01,604 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-07 01:23:01,605 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:23:01,607 INFO L263 TraceCheckSpWp]: Trace formula consists of 278 conjuncts, 54 conjunts are in the unsatisfiable core [2021-11-07 01:23:01,608 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:23:02,448 INFO L134 CoverageAnalysis]: Checked inductivity of 498 backedges. 0 proven. 498 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:23:02,448 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:23:03,289 INFO L134 CoverageAnalysis]: Checked inductivity of 498 backedges. 0 proven. 498 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:23:03,289 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1425968304] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:23:03,289 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1570092200] [2021-11-07 01:23:03,291 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-07 01:23:03,291 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 01:23:03,291 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-07 01:23:03,291 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-07 01:23:03,291 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-07 01:23:03,295 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:23:03,295 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:23:03,295 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:23:03,296 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-07 01:23:03,296 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:23:03,297 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:23:03,297 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-07 01:23:03,298 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 97 [2021-11-07 01:23:03,299 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_30|], 10=[|v_#valid_31|]} [2021-11-07 01:23:03,304 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:23:03,304 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 [2021-11-07 01:23:03,305 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:23:03,305 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:23:03,305 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:23:03,306 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:23:03,306 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-07 01:23:03,306 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:03,308 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:23:03,310 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:23:03,311 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:23:03,312 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:23:03,315 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:23:03,316 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 [2021-11-07 01:23:03,316 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:23:03,318 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:23:03,325 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:23:03,326 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:23:03,326 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-07 01:23:03,327 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:03,329 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:23:03,330 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:23:03,331 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 79 [2021-11-07 01:23:03,331 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-07 01:23:03,332 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:94, output treesize:79 [2021-11-07 01:23:03,338 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.1 percent of original size [2021-11-07 01:23:03,341 INFO L185 QuantifierPusher]: treesize reduction 5, result has 94.4 percent of original size 85 [2021-11-07 01:23:03,344 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:03,350 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:03,356 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:03,371 INFO L180 QuantifierPusher]: treesize reduction 3, result has 98.7 percent of original size [2021-11-07 01:23:03,375 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 227 [2021-11-07 01:23:03,379 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:03,396 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:03,397 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:03,398 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:03,398 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:03,399 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:03,401 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:03,405 INFO L180 QuantifierPusher]: treesize reduction 24, result has 69.6 percent of original size [2021-11-07 01:23:03,407 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 46 [2021-11-07 01:23:03,409 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:03,413 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:03,417 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:03,425 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:23:03,428 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 101 [2021-11-07 01:23:03,430 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:03,438 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:03,439 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:03,439 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:03,440 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:03,442 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:03,445 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-07 01:23:03,447 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-07 01:23:03,452 INFO L180 QuantifierPusher]: treesize reduction 25, result has 81.5 percent of original size [2021-11-07 01:23:03,455 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 107 [2021-11-07 01:23:03,458 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:03,465 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:03,466 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:03,467 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:03,468 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:03,469 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:03,469 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:03,470 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:03,471 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:03,474 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:03,479 INFO L180 QuantifierPusher]: treesize reduction 24, result has 81.7 percent of original size [2021-11-07 01:23:03,481 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 102 [2021-11-07 01:23:03,488 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-07 01:23:04,297 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-07 01:23:04,297 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-07 01:23:04,297 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 71 [2021-11-07 01:23:04,298 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1650107308] [2021-11-07 01:23:04,298 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 71 states [2021-11-07 01:23:04,298 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:23:04,299 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2021-11-07 01:23:04,300 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=847, Invalid=5005, Unknown=0, NotChecked=0, Total=5852 [2021-11-07 01:23:04,300 INFO L87 Difference]: Start difference. First operand 83 states and 98 transitions. Second operand has 71 states, 71 states have (on average 1.4929577464788732) internal successors, (106), 71 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:23:05,608 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:23:05,608 INFO L93 Difference]: Finished difference Result 138 states and 154 transitions. [2021-11-07 01:23:05,608 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-11-07 01:23:05,608 INFO L78 Accepts]: Start accepts. Automaton has has 71 states, 71 states have (on average 1.4929577464788732) internal successors, (106), 71 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 68 [2021-11-07 01:23:05,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:23:05,609 INFO L225 Difference]: With dead ends: 138 [2021-11-07 01:23:05,610 INFO L226 Difference]: Without dead ends: 136 [2021-11-07 01:23:05,611 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 272 GetRequests, 160 SyntacticMatches, 3 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3489 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=1999, Invalid=10211, Unknown=0, NotChecked=0, Total=12210 [2021-11-07 01:23:05,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2021-11-07 01:23:05,687 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 72. [2021-11-07 01:23:05,687 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 71 states have (on average 1.028169014084507) internal successors, (73), 71 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) [2021-11-07 01:23:05,688 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 73 transitions. [2021-11-07 01:23:05,688 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 73 transitions. Word has length 68 [2021-11-07 01:23:05,688 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:23:05,688 INFO L470 AbstractCegarLoop]: Abstraction has 72 states and 73 transitions. [2021-11-07 01:23:05,688 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 71 states, 71 states have (on average 1.4929577464788732) internal successors, (106), 71 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:23:05,688 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 73 transitions. [2021-11-07 01:23:05,689 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-11-07 01:23:05,689 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:23:05,689 INFO L513 BasicCegarLoop]: trace histogram [17, 17, 16, 16, 1, 1, 1, 1, 1] [2021-11-07 01:23:05,717 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Ended with exit code 0 [2021-11-07 01:23:05,889 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable686 [2021-11-07 01:23:05,890 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:23:05,890 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:23:05,890 INFO L85 PathProgramCache]: Analyzing trace with hash 562343748, now seen corresponding path program 22 times [2021-11-07 01:23:05,890 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:23:05,890 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1052626219] [2021-11-07 01:23:05,890 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:23:05,890 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:23:05,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:23:07,253 INFO L134 CoverageAnalysis]: Checked inductivity of 545 backedges. 330 proven. 215 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:23:07,254 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:23:07,254 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1052626219] [2021-11-07 01:23:07,254 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1052626219] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:23:07,254 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2093729980] [2021-11-07 01:23:07,254 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-07 01:23:07,254 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:23:07,254 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:23:07,255 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:23:07,256 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-11-07 01:23:08,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:23:08,969 INFO L263 TraceCheckSpWp]: Trace formula consists of 288 conjuncts, 73 conjunts are in the unsatisfiable core [2021-11-07 01:23:08,971 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:23:10,517 INFO L134 CoverageAnalysis]: Checked inductivity of 545 backedges. 0 proven. 545 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:23:10,518 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:23:14,179 INFO L134 CoverageAnalysis]: Checked inductivity of 545 backedges. 0 proven. 545 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:23:14,179 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2093729980] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:23:14,180 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [422029433] [2021-11-07 01:23:14,180 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-07 01:23:14,181 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 01:23:14,181 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-07 01:23:14,181 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-07 01:23:14,181 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-07 01:23:14,183 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:23:14,184 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:23:14,184 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:23:14,184 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-07 01:23:14,185 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:23:14,185 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:23:14,185 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-07 01:23:14,186 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 97 [2021-11-07 01:23:14,187 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_31|], 10=[|v_#valid_32|]} [2021-11-07 01:23:14,191 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:23:14,192 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 [2021-11-07 01:23:14,192 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:23:14,192 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:23:14,192 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:23:14,193 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:23:14,193 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-07 01:23:14,193 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:14,194 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:23:14,196 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:23:14,197 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:23:14,198 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:23:14,200 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:23:14,201 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 [2021-11-07 01:23:14,201 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:23:14,202 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:23:14,203 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:23:14,203 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:23:14,203 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-07 01:23:14,203 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:14,204 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:23:14,205 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:23:14,205 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 79 [2021-11-07 01:23:14,206 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-07 01:23:14,206 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:94, output treesize:79 [2021-11-07 01:23:14,208 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.1 percent of original size [2021-11-07 01:23:14,209 INFO L185 QuantifierPusher]: treesize reduction 5, result has 94.4 percent of original size 85 [2021-11-07 01:23:14,211 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:14,214 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:14,217 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:14,225 INFO L180 QuantifierPusher]: treesize reduction 3, result has 98.7 percent of original size [2021-11-07 01:23:14,227 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 227 [2021-11-07 01:23:14,231 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:14,240 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:14,241 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:14,241 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:14,242 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:14,242 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:14,244 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:14,246 INFO L180 QuantifierPusher]: treesize reduction 24, result has 69.6 percent of original size [2021-11-07 01:23:14,247 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 46 [2021-11-07 01:23:14,248 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:14,251 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:14,253 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:14,258 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:23:14,260 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 101 [2021-11-07 01:23:14,262 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:14,267 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:14,267 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:14,268 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:14,268 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:14,270 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:14,272 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-07 01:23:14,273 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-07 01:23:14,277 INFO L180 QuantifierPusher]: treesize reduction 25, result has 81.5 percent of original size [2021-11-07 01:23:14,279 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 107 [2021-11-07 01:23:14,287 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:14,292 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:14,294 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:14,295 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:14,296 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:14,296 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:14,297 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:14,297 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:14,298 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:14,311 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:14,316 INFO L180 QuantifierPusher]: treesize reduction 24, result has 81.7 percent of original size [2021-11-07 01:23:14,317 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 102 [2021-11-07 01:23:14,323 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-07 01:23:15,338 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-07 01:23:15,338 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-07 01:23:15,338 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 38, 38] total 93 [2021-11-07 01:23:15,339 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1182052140] [2021-11-07 01:23:15,339 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 93 states [2021-11-07 01:23:15,339 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:23:15,340 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 93 interpolants. [2021-11-07 01:23:15,340 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1272, Invalid=8430, Unknown=0, NotChecked=0, Total=9702 [2021-11-07 01:23:15,341 INFO L87 Difference]: Start difference. First operand 72 states and 73 transitions. Second operand has 93 states, 93 states have (on average 2.064516129032258) internal successors, (192), 93 states have internal predecessors, (192), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:23:24,504 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:23:24,505 INFO L93 Difference]: Finished difference Result 198 states and 219 transitions. [2021-11-07 01:23:24,505 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2021-11-07 01:23:24,506 INFO L78 Accepts]: Start accepts. Automaton has has 93 states, 93 states have (on average 2.064516129032258) internal successors, (192), 93 states have internal predecessors, (192), 0 states have call successors, (0), 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 71 [2021-11-07 01:23:24,506 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:23:24,507 INFO L225 Difference]: With dead ends: 198 [2021-11-07 01:23:24,508 INFO L226 Difference]: Without dead ends: 142 [2021-11-07 01:23:24,510 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 322 GetRequests, 151 SyntacticMatches, 2 SemanticMatches, 169 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7705 ImplicationChecksByTransitivity, 12.2s TimeCoverageRelationStatistics Valid=3755, Invalid=25315, Unknown=0, NotChecked=0, Total=29070 [2021-11-07 01:23:24,511 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2021-11-07 01:23:24,587 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 93. [2021-11-07 01:23:24,587 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 92 states have (on average 1.2065217391304348) internal successors, (111), 92 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) [2021-11-07 01:23:24,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 111 transitions. [2021-11-07 01:23:24,588 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 111 transitions. Word has length 71 [2021-11-07 01:23:24,588 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:23:24,588 INFO L470 AbstractCegarLoop]: Abstraction has 93 states and 111 transitions. [2021-11-07 01:23:24,589 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 93 states, 93 states have (on average 2.064516129032258) internal successors, (192), 93 states have internal predecessors, (192), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:23:24,589 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 111 transitions. [2021-11-07 01:23:24,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-11-07 01:23:24,590 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:23:24,590 INFO L513 BasicCegarLoop]: trace histogram [18, 18, 17, 17, 1, 1, 1, 1, 1] [2021-11-07 01:23:24,618 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2021-11-07 01:23:24,790 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable718 [2021-11-07 01:23:24,791 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:23:24,791 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:23:24,791 INFO L85 PathProgramCache]: Analyzing trace with hash 307608250, now seen corresponding path program 23 times [2021-11-07 01:23:24,791 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:23:24,791 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1288826753] [2021-11-07 01:23:24,791 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:23:24,791 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:23:24,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:23:26,498 INFO L134 CoverageAnalysis]: Checked inductivity of 613 backedges. 376 proven. 237 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:23:26,498 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:23:26,499 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1288826753] [2021-11-07 01:23:26,499 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1288826753] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:23:26,499 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [618082311] [2021-11-07 01:23:26,499 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-07 01:23:26,499 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:23:26,499 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:23:26,500 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:23:26,502 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-11-07 01:23:28,426 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2021-11-07 01:23:28,426 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:23:28,428 INFO L263 TraceCheckSpWp]: Trace formula consists of 303 conjuncts, 60 conjunts are in the unsatisfiable core [2021-11-07 01:23:28,431 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:23:30,991 INFO L134 CoverageAnalysis]: Checked inductivity of 613 backedges. 0 proven. 613 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:23:30,992 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:23:35,142 INFO L134 CoverageAnalysis]: Checked inductivity of 613 backedges. 0 proven. 613 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:23:35,143 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [618082311] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:23:35,143 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2034942421] [2021-11-07 01:23:35,144 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-07 01:23:35,144 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 01:23:35,144 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-07 01:23:35,145 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-07 01:23:35,145 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-07 01:23:35,157 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:23:35,158 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:23:35,158 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:23:35,158 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-07 01:23:35,159 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:23:35,159 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:23:35,160 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-07 01:23:35,161 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 97 [2021-11-07 01:23:35,163 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_32|], 10=[|v_#valid_33|]} [2021-11-07 01:23:35,166 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:23:35,167 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 [2021-11-07 01:23:35,167 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:23:35,168 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:23:35,168 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:23:35,168 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:23:35,168 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-07 01:23:35,169 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:35,170 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:23:35,172 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:23:35,172 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:23:35,173 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:23:35,176 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:23:35,176 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 [2021-11-07 01:23:35,177 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:23:35,178 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:23:35,178 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:23:35,178 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:23:35,178 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-07 01:23:35,179 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:35,180 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:23:35,181 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:23:35,182 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 79 [2021-11-07 01:23:35,182 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-07 01:23:35,183 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:94, output treesize:79 [2021-11-07 01:23:35,186 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.1 percent of original size [2021-11-07 01:23:35,187 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-07 01:23:35,189 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:35,193 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:35,199 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:35,208 INFO L180 QuantifierPusher]: treesize reduction 3, result has 98.7 percent of original size [2021-11-07 01:23:35,210 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 229 [2021-11-07 01:23:35,213 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:35,229 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:35,230 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:35,230 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:35,231 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:35,231 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:35,233 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:35,235 INFO L180 QuantifierPusher]: treesize reduction 24, result has 69.6 percent of original size [2021-11-07 01:23:35,240 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 46 [2021-11-07 01:23:35,242 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:35,246 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:35,250 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:35,259 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:23:35,261 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 101 [2021-11-07 01:23:35,264 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:35,272 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:35,273 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:35,273 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:35,274 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:35,276 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:35,279 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-07 01:23:35,281 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-07 01:23:35,287 INFO L180 QuantifierPusher]: treesize reduction 25, result has 81.5 percent of original size [2021-11-07 01:23:35,290 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 107 [2021-11-07 01:23:35,292 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:35,298 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:35,299 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:35,299 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:35,300 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:35,300 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:35,301 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:35,301 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:35,302 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:35,304 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:35,307 INFO L180 QuantifierPusher]: treesize reduction 24, result has 81.7 percent of original size [2021-11-07 01:23:35,309 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 102 [2021-11-07 01:23:35,314 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-07 01:23:36,353 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-07 01:23:36,354 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-07 01:23:36,354 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 40, 40] total 116 [2021-11-07 01:23:36,354 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1463368334] [2021-11-07 01:23:36,354 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 116 states [2021-11-07 01:23:36,354 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:23:36,355 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 116 interpolants. [2021-11-07 01:23:36,356 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1616, Invalid=13146, Unknown=0, NotChecked=0, Total=14762 [2021-11-07 01:23:36,356 INFO L87 Difference]: Start difference. First operand 93 states and 111 transitions. Second operand has 116 states, 116 states have (on average 1.896551724137931) internal successors, (220), 116 states have internal predecessors, (220), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:23:43,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:23:43,516 INFO L93 Difference]: Finished difference Result 155 states and 174 transitions. [2021-11-07 01:23:43,516 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-11-07 01:23:43,517 INFO L78 Accepts]: Start accepts. Automaton has has 116 states, 116 states have (on average 1.896551724137931) internal successors, (220), 116 states have internal predecessors, (220), 0 states have call successors, (0), 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 75 [2021-11-07 01:23:43,517 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:23:43,517 INFO L225 Difference]: With dead ends: 155 [2021-11-07 01:23:43,517 INFO L226 Difference]: Without dead ends: 96 [2021-11-07 01:23:43,519 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 303 GetRequests, 143 SyntacticMatches, 1 SemanticMatches, 159 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6804 ImplicationChecksByTransitivity, 12.7s TimeCoverageRelationStatistics Valid=2832, Invalid=22928, Unknown=0, NotChecked=0, Total=25760 [2021-11-07 01:23:43,519 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2021-11-07 01:23:43,590 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 93. [2021-11-07 01:23:43,590 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 92 states have (on average 1.1956521739130435) internal successors, (110), 92 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:23:43,591 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 110 transitions. [2021-11-07 01:23:43,591 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 110 transitions. Word has length 75 [2021-11-07 01:23:43,591 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:23:43,591 INFO L470 AbstractCegarLoop]: Abstraction has 93 states and 110 transitions. [2021-11-07 01:23:43,592 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 116 states, 116 states have (on average 1.896551724137931) internal successors, (220), 116 states have internal predecessors, (220), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:23:43,592 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 110 transitions. [2021-11-07 01:23:43,592 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-11-07 01:23:43,593 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:23:43,593 INFO L513 BasicCegarLoop]: trace histogram [19, 18, 17, 17, 1, 1, 1, 1, 1] [2021-11-07 01:23:43,640 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2021-11-07 01:23:43,811 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable750,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:23:43,812 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:23:43,812 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:23:43,812 INFO L85 PathProgramCache]: Analyzing trace with hash -596019494, now seen corresponding path program 24 times [2021-11-07 01:23:43,812 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:23:43,812 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1981461506] [2021-11-07 01:23:43,812 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:23:43,812 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:23:43,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:23:44,597 INFO L134 CoverageAnalysis]: Checked inductivity of 632 backedges. 153 proven. 479 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:23:44,597 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:23:44,597 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1981461506] [2021-11-07 01:23:44,597 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1981461506] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:23:44,597 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [311631686] [2021-11-07 01:23:44,598 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-07 01:23:44,598 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:23:44,598 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:23:44,599 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:23:44,615 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2021-11-07 01:23:46,872 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-07 01:23:46,872 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:23:46,874 INFO L263 TraceCheckSpWp]: Trace formula consists of 308 conjuncts, 60 conjunts are in the unsatisfiable core [2021-11-07 01:23:46,876 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:23:47,858 INFO L134 CoverageAnalysis]: Checked inductivity of 632 backedges. 0 proven. 632 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:23:47,858 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:23:48,996 INFO L134 CoverageAnalysis]: Checked inductivity of 632 backedges. 0 proven. 632 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:23:48,997 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [311631686] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:23:48,997 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [539137285] [2021-11-07 01:23:48,998 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-07 01:23:48,998 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 01:23:48,998 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-07 01:23:48,998 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-07 01:23:48,999 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-07 01:23:49,003 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:23:49,004 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:23:49,004 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:23:49,005 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-07 01:23:49,005 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:23:49,005 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:23:49,006 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-07 01:23:49,006 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 97 [2021-11-07 01:23:49,010 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_33|], 10=[|v_#valid_34|]} [2021-11-07 01:23:49,014 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:23:49,015 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 [2021-11-07 01:23:49,016 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:23:49,016 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:23:49,016 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:23:49,017 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:23:49,017 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-07 01:23:49,017 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:49,018 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:23:49,022 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:23:49,031 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:23:49,032 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:23:49,035 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:23:49,036 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 [2021-11-07 01:23:49,036 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:23:49,037 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:23:49,038 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:23:49,038 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:23:49,038 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-07 01:23:49,039 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:49,040 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:23:49,041 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:23:49,041 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 79 [2021-11-07 01:23:49,042 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-07 01:23:49,042 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:94, output treesize:79 [2021-11-07 01:23:49,044 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.1 percent of original size [2021-11-07 01:23:49,046 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-07 01:23:49,048 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:49,051 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:49,056 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:49,066 INFO L180 QuantifierPusher]: treesize reduction 3, result has 98.7 percent of original size [2021-11-07 01:23:49,069 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 229 [2021-11-07 01:23:49,072 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:49,084 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:49,085 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:49,085 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:49,086 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:49,086 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:49,088 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:49,090 INFO L180 QuantifierPusher]: treesize reduction 24, result has 69.6 percent of original size [2021-11-07 01:23:49,092 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 46 [2021-11-07 01:23:49,093 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:49,096 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:49,100 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:49,105 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:23:49,111 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 101 [2021-11-07 01:23:49,114 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:49,120 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:49,120 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:49,121 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:49,122 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:49,123 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:49,125 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-07 01:23:49,126 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-07 01:23:49,129 INFO L180 QuantifierPusher]: treesize reduction 25, result has 81.5 percent of original size [2021-11-07 01:23:49,131 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 107 [2021-11-07 01:23:49,133 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:49,137 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:49,137 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:49,138 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:49,138 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:49,138 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:49,139 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:49,139 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:49,140 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:49,142 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:23:49,145 INFO L180 QuantifierPusher]: treesize reduction 24, result has 81.7 percent of original size [2021-11-07 01:23:49,146 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 102 [2021-11-07 01:23:49,150 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-07 01:23:49,929 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-07 01:23:49,929 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-07 01:23:49,929 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 79 [2021-11-07 01:23:49,930 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1024866141] [2021-11-07 01:23:49,930 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 79 states [2021-11-07 01:23:49,930 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:23:49,931 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2021-11-07 01:23:49,931 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1038, Invalid=6102, Unknown=0, NotChecked=0, Total=7140 [2021-11-07 01:23:49,931 INFO L87 Difference]: Start difference. First operand 93 states and 110 transitions. Second operand has 79 states, 79 states have (on average 1.4936708860759493) internal successors, (118), 79 states have internal predecessors, (118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:23:51,624 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:23:51,624 INFO L93 Difference]: Finished difference Result 154 states and 172 transitions. [2021-11-07 01:23:51,625 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-11-07 01:23:51,625 INFO L78 Accepts]: Start accepts. Automaton has has 79 states, 79 states have (on average 1.4936708860759493) internal successors, (118), 79 states have internal predecessors, (118), 0 states have call successors, (0), 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 [2021-11-07 01:23:51,625 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:23:51,626 INFO L225 Difference]: With dead ends: 154 [2021-11-07 01:23:51,626 INFO L226 Difference]: Without dead ends: 152 [2021-11-07 01:23:51,628 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 304 GetRequests, 180 SyntacticMatches, 3 SemanticMatches, 121 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4302 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=2459, Invalid=12547, Unknown=0, NotChecked=0, Total=15006 [2021-11-07 01:23:51,628 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2021-11-07 01:23:51,693 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 80. [2021-11-07 01:23:51,693 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 79 states have (on average 1.0253164556962024) internal successors, (81), 79 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) [2021-11-07 01:23:51,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 81 transitions. [2021-11-07 01:23:51,694 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 81 transitions. Word has length 76 [2021-11-07 01:23:51,694 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:23:51,694 INFO L470 AbstractCegarLoop]: Abstraction has 80 states and 81 transitions. [2021-11-07 01:23:51,694 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 79 states, 79 states have (on average 1.4936708860759493) internal successors, (118), 79 states have internal predecessors, (118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:23:51,694 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 81 transitions. [2021-11-07 01:23:51,695 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-07 01:23:51,695 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:23:51,695 INFO L513 BasicCegarLoop]: trace histogram [19, 19, 18, 18, 1, 1, 1, 1, 1] [2021-11-07 01:23:51,728 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2021-11-07 01:23:51,907 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable782 [2021-11-07 01:23:51,908 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:23:51,908 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:23:51,908 INFO L85 PathProgramCache]: Analyzing trace with hash -617118844, now seen corresponding path program 25 times [2021-11-07 01:23:51,908 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:23:51,908 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2053282628] [2021-11-07 01:23:51,908 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:23:51,908 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:23:51,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:23:53,569 INFO L134 CoverageAnalysis]: Checked inductivity of 685 backedges. 425 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:23:53,570 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:23:53,570 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2053282628] [2021-11-07 01:23:53,570 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2053282628] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:23:53,570 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [385665874] [2021-11-07 01:23:53,570 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-07 01:23:53,570 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:23:53,570 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:23:53,571 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:23:53,573 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2021-11-07 01:23:55,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:23:55,641 INFO L263 TraceCheckSpWp]: Trace formula consists of 318 conjuncts, 81 conjunts are in the unsatisfiable core [2021-11-07 01:23:55,643 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:23:57,417 INFO L134 CoverageAnalysis]: Checked inductivity of 685 backedges. 0 proven. 685 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:23:57,417 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:24:01,842 INFO L134 CoverageAnalysis]: Checked inductivity of 685 backedges. 0 proven. 685 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:24:01,843 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [385665874] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:24:01,843 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [674211737] [2021-11-07 01:24:01,844 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-07 01:24:01,844 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 01:24:01,845 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-07 01:24:01,845 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-07 01:24:01,845 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-07 01:24:01,850 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:24:01,850 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:24:01,851 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:24:01,851 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-07 01:24:01,851 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:24:01,852 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:24:01,852 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-07 01:24:01,853 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 97 [2021-11-07 01:24:01,854 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_34|], 10=[|v_#valid_35|]} [2021-11-07 01:24:01,859 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:24:01,859 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 [2021-11-07 01:24:01,860 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:24:01,860 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:24:01,860 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:24:01,861 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:24:01,861 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-07 01:24:01,861 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:01,862 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:24:01,870 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:24:01,871 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:24:01,872 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:24:01,875 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:24:01,875 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 [2021-11-07 01:24:01,876 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:24:01,881 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:24:01,881 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:24:01,882 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:24:01,882 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-07 01:24:01,882 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:01,884 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:24:01,884 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:24:01,885 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 79 [2021-11-07 01:24:01,885 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-07 01:24:01,885 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:94, output treesize:79 [2021-11-07 01:24:01,888 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.1 percent of original size [2021-11-07 01:24:01,889 INFO L185 QuantifierPusher]: treesize reduction 5, result has 94.4 percent of original size 85 [2021-11-07 01:24:01,891 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:01,894 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:01,899 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:01,911 INFO L180 QuantifierPusher]: treesize reduction 3, result has 98.7 percent of original size [2021-11-07 01:24:01,914 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 227 [2021-11-07 01:24:01,917 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:01,927 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:01,928 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:01,928 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:01,929 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:01,929 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:01,931 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:01,949 INFO L180 QuantifierPusher]: treesize reduction 24, result has 69.6 percent of original size [2021-11-07 01:24:01,950 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 46 [2021-11-07 01:24:01,952 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:01,956 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:01,960 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:01,967 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:24:01,969 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 101 [2021-11-07 01:24:01,971 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:01,978 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:01,979 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:01,979 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:01,980 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:01,982 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:01,986 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-07 01:24:01,987 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-07 01:24:01,993 INFO L180 QuantifierPusher]: treesize reduction 25, result has 81.5 percent of original size [2021-11-07 01:24:01,995 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-07 01:24:01,998 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:02,005 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:02,006 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:02,007 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:02,008 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:02,009 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:02,010 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:02,010 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:02,011 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:02,014 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:02,017 INFO L180 QuantifierPusher]: treesize reduction 24, result has 81.7 percent of original size [2021-11-07 01:24:02,019 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 102 [2021-11-07 01:24:02,023 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-07 01:24:03,078 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-07 01:24:03,079 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-07 01:24:03,079 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 42, 42] total 103 [2021-11-07 01:24:03,079 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1055547011] [2021-11-07 01:24:03,080 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 103 states [2021-11-07 01:24:03,080 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:24:03,081 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 103 interpolants. [2021-11-07 01:24:03,082 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1549, Invalid=10223, Unknown=0, NotChecked=0, Total=11772 [2021-11-07 01:24:03,082 INFO L87 Difference]: Start difference. First operand 80 states and 81 transitions. Second operand has 103 states, 103 states have (on average 2.0776699029126213) internal successors, (214), 103 states have internal predecessors, (214), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:24:14,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:24:14,106 INFO L93 Difference]: Finished difference Result 220 states and 243 transitions. [2021-11-07 01:24:14,106 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 104 states. [2021-11-07 01:24:14,106 INFO L78 Accepts]: Start accepts. Automaton has has 103 states, 103 states have (on average 2.0776699029126213) internal successors, (214), 103 states have internal predecessors, (214), 0 states have call successors, (0), 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 79 [2021-11-07 01:24:14,106 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:24:14,107 INFO L225 Difference]: With dead ends: 220 [2021-11-07 01:24:14,108 INFO L226 Difference]: Without dead ends: 158 [2021-11-07 01:24:14,111 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 358 GetRequests, 169 SyntacticMatches, 2 SemanticMatches, 187 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9445 ImplicationChecksByTransitivity, 14.7s TimeCoverageRelationStatistics Valid=4586, Invalid=30946, Unknown=0, NotChecked=0, Total=35532 [2021-11-07 01:24:14,111 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 158 states. [2021-11-07 01:24:14,201 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 158 to 103. [2021-11-07 01:24:14,201 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 102 states have (on average 1.2058823529411764) internal successors, (123), 102 states have internal predecessors, (123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:24:14,202 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 123 transitions. [2021-11-07 01:24:14,202 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 123 transitions. Word has length 79 [2021-11-07 01:24:14,202 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:24:14,202 INFO L470 AbstractCegarLoop]: Abstraction has 103 states and 123 transitions. [2021-11-07 01:24:14,202 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 103 states, 103 states have (on average 2.0776699029126213) internal successors, (214), 103 states have internal predecessors, (214), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:24:14,202 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 123 transitions. [2021-11-07 01:24:14,203 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-11-07 01:24:14,203 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:24:14,203 INFO L513 BasicCegarLoop]: trace histogram [20, 20, 19, 19, 1, 1, 1, 1, 1] [2021-11-07 01:24:14,232 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2021-11-07 01:24:14,403 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable814,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:24:14,403 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:24:14,404 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:24:14,404 INFO L85 PathProgramCache]: Analyzing trace with hash -216949126, now seen corresponding path program 26 times [2021-11-07 01:24:14,404 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:24:14,404 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [117071298] [2021-11-07 01:24:14,404 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:24:14,404 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:24:14,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:24:16,225 INFO L134 CoverageAnalysis]: Checked inductivity of 761 backedges. 477 proven. 284 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:24:16,225 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:24:16,226 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [117071298] [2021-11-07 01:24:16,226 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [117071298] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:24:16,226 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1855387297] [2021-11-07 01:24:16,226 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-07 01:24:16,226 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:24:16,227 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:24:16,232 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:24:16,238 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2021-11-07 01:24:18,546 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 20 check-sat command(s) [2021-11-07 01:24:18,546 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:24:18,549 INFO L263 TraceCheckSpWp]: Trace formula consists of 333 conjuncts, 66 conjunts are in the unsatisfiable core [2021-11-07 01:24:18,551 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:24:21,515 INFO L134 CoverageAnalysis]: Checked inductivity of 761 backedges. 0 proven. 761 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:24:21,516 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:24:26,235 INFO L134 CoverageAnalysis]: Checked inductivity of 761 backedges. 0 proven. 761 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:24:26,235 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1855387297] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:24:26,235 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1882717405] [2021-11-07 01:24:26,236 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-07 01:24:26,236 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 01:24:26,236 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-07 01:24:26,237 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-07 01:24:26,237 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-07 01:24:26,239 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:24:26,239 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:24:26,239 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:24:26,240 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-07 01:24:26,240 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:24:26,251 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:24:26,252 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-07 01:24:26,253 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 97 [2021-11-07 01:24:26,255 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_35|], 10=[|v_#valid_36|]} [2021-11-07 01:24:26,261 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:24:26,261 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 [2021-11-07 01:24:26,262 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:24:26,262 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:24:26,263 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:24:26,263 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:24:26,264 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-07 01:24:26,264 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:26,266 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:24:26,269 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:24:26,270 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:24:26,272 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:24:26,275 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:24:26,277 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 [2021-11-07 01:24:26,277 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:24:26,279 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:24:26,279 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:24:26,280 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:24:26,280 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-07 01:24:26,280 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:26,282 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:24:26,283 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:24:26,284 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 79 [2021-11-07 01:24:26,285 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-07 01:24:26,285 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:94, output treesize:79 [2021-11-07 01:24:26,288 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.1 percent of original size [2021-11-07 01:24:26,290 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-07 01:24:26,293 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:26,298 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:26,304 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:26,320 INFO L180 QuantifierPusher]: treesize reduction 3, result has 98.7 percent of original size [2021-11-07 01:24:26,324 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 229 [2021-11-07 01:24:26,328 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:26,341 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:26,341 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:26,342 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:26,342 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:26,343 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:26,347 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:26,350 INFO L180 QuantifierPusher]: treesize reduction 24, result has 69.6 percent of original size [2021-11-07 01:24:26,352 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 46 [2021-11-07 01:24:26,353 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:26,356 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:26,358 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:26,363 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:24:26,365 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 101 [2021-11-07 01:24:26,369 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:26,374 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:26,374 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:26,375 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:26,375 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:26,376 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:26,379 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-07 01:24:26,380 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-07 01:24:26,387 INFO L180 QuantifierPusher]: treesize reduction 25, result has 81.5 percent of original size [2021-11-07 01:24:26,391 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-07 01:24:26,393 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:26,398 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:26,398 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:26,399 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:26,399 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:26,400 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:26,400 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:26,401 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:26,401 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:26,403 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:26,406 INFO L180 QuantifierPusher]: treesize reduction 24, result has 81.7 percent of original size [2021-11-07 01:24:26,408 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 102 [2021-11-07 01:24:26,413 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-07 01:24:27,478 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-07 01:24:27,478 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-07 01:24:27,479 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 44, 44] total 128 [2021-11-07 01:24:27,479 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1153128659] [2021-11-07 01:24:27,480 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 128 states [2021-11-07 01:24:27,480 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:24:27,481 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 128 interpolants. [2021-11-07 01:24:27,482 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1950, Invalid=15872, Unknown=0, NotChecked=0, Total=17822 [2021-11-07 01:24:27,483 INFO L87 Difference]: Start difference. First operand 103 states and 123 transitions. Second operand has 128 states, 128 states have (on average 1.90625) internal successors, (244), 128 states have internal predecessors, (244), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:24:36,381 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:24:36,381 INFO L93 Difference]: Finished difference Result 171 states and 192 transitions. [2021-11-07 01:24:36,381 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-11-07 01:24:36,381 INFO L78 Accepts]: Start accepts. Automaton has has 128 states, 128 states have (on average 1.90625) internal successors, (244), 128 states have internal predecessors, (244), 0 states have call successors, (0), 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 83 [2021-11-07 01:24:36,382 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:24:36,382 INFO L225 Difference]: With dead ends: 171 [2021-11-07 01:24:36,382 INFO L226 Difference]: Without dead ends: 106 [2021-11-07 01:24:36,384 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 335 GetRequests, 159 SyntacticMatches, 1 SemanticMatches, 175 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8238 ImplicationChecksByTransitivity, 15.1s TimeCoverageRelationStatistics Valid=3418, Invalid=27734, Unknown=0, NotChecked=0, Total=31152 [2021-11-07 01:24:36,384 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2021-11-07 01:24:36,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 103. [2021-11-07 01:24:36,475 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 102 states have (on average 1.196078431372549) internal successors, (122), 102 states have internal predecessors, (122), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:24:36,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 122 transitions. [2021-11-07 01:24:36,476 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 122 transitions. Word has length 83 [2021-11-07 01:24:36,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:24:36,476 INFO L470 AbstractCegarLoop]: Abstraction has 103 states and 122 transitions. [2021-11-07 01:24:36,476 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 128 states, 128 states have (on average 1.90625) internal successors, (244), 128 states have internal predecessors, (244), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:24:36,476 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 122 transitions. [2021-11-07 01:24:36,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-11-07 01:24:36,476 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:24:36,477 INFO L513 BasicCegarLoop]: trace histogram [21, 20, 19, 19, 1, 1, 1, 1, 1] [2021-11-07 01:24:36,507 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2021-11-07 01:24:36,677 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable846,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:24:36,677 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:24:36,677 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:24:36,678 INFO L85 PathProgramCache]: Analyzing trace with hash -1270400358, now seen corresponding path program 27 times [2021-11-07 01:24:36,678 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:24:36,678 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1835837633] [2021-11-07 01:24:36,678 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:24:36,678 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:24:36,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:24:37,608 INFO L134 CoverageAnalysis]: Checked inductivity of 782 backedges. 190 proven. 592 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:24:37,608 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:24:37,608 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1835837633] [2021-11-07 01:24:37,609 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1835837633] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:24:37,609 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [317005386] [2021-11-07 01:24:37,609 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-07 01:24:37,609 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:24:37,609 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:24:37,610 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:24:37,631 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2021-11-07 01:24:40,143 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-07 01:24:40,143 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:24:40,146 INFO L263 TraceCheckSpWp]: Trace formula consists of 338 conjuncts, 66 conjunts are in the unsatisfiable core [2021-11-07 01:24:40,148 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:24:41,267 INFO L134 CoverageAnalysis]: Checked inductivity of 782 backedges. 0 proven. 782 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:24:41,267 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:24:42,324 INFO L134 CoverageAnalysis]: Checked inductivity of 782 backedges. 0 proven. 782 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:24:42,325 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [317005386] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:24:42,325 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1761116993] [2021-11-07 01:24:42,326 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-07 01:24:42,326 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 01:24:42,326 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-07 01:24:42,327 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-07 01:24:42,327 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-07 01:24:42,333 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:24:42,333 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:24:42,334 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:24:42,334 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-07 01:24:42,334 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:24:42,335 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:24:42,335 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-07 01:24:42,336 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 97 [2021-11-07 01:24:42,337 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_36|], 10=[|v_#valid_37|]} [2021-11-07 01:24:42,341 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:24:42,342 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 [2021-11-07 01:24:42,342 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:24:42,342 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:24:42,343 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:24:42,343 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:24:42,343 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-07 01:24:42,344 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:42,345 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:24:42,347 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:24:42,348 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:24:42,349 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:24:42,351 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:24:42,352 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 [2021-11-07 01:24:42,353 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:24:42,354 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:24:42,354 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:24:42,354 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:24:42,355 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-07 01:24:42,355 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:42,356 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:24:42,357 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:24:42,357 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 79 [2021-11-07 01:24:42,357 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-07 01:24:42,358 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:94, output treesize:79 [2021-11-07 01:24:42,360 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.1 percent of original size [2021-11-07 01:24:42,361 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-07 01:24:42,363 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:42,367 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:42,371 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:42,380 INFO L180 QuantifierPusher]: treesize reduction 3, result has 98.7 percent of original size [2021-11-07 01:24:42,383 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 229 [2021-11-07 01:24:42,386 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:42,397 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:42,398 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:42,398 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:42,399 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:42,399 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:42,401 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:42,403 INFO L180 QuantifierPusher]: treesize reduction 24, result has 69.6 percent of original size [2021-11-07 01:24:42,404 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 46 [2021-11-07 01:24:42,406 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:42,408 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:42,411 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:42,416 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:24:42,418 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 101 [2021-11-07 01:24:42,419 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:42,424 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:42,427 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:42,428 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:42,428 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:42,430 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:42,432 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-07 01:24:42,433 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-07 01:24:42,438 INFO L180 QuantifierPusher]: treesize reduction 25, result has 81.5 percent of original size [2021-11-07 01:24:42,439 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 107 [2021-11-07 01:24:42,442 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:42,448 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:42,448 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:42,449 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:42,449 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:42,450 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:42,450 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:42,451 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:42,451 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:42,453 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:42,456 INFO L180 QuantifierPusher]: treesize reduction 24, result has 81.7 percent of original size [2021-11-07 01:24:42,458 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 102 [2021-11-07 01:24:42,462 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-07 01:24:43,244 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-07 01:24:43,244 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-07 01:24:43,244 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 87 [2021-11-07 01:24:43,244 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1671559256] [2021-11-07 01:24:43,245 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 87 states [2021-11-07 01:24:43,245 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:24:43,245 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2021-11-07 01:24:43,246 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1249, Invalid=7307, Unknown=0, NotChecked=0, Total=8556 [2021-11-07 01:24:43,246 INFO L87 Difference]: Start difference. First operand 103 states and 122 transitions. Second operand has 87 states, 87 states have (on average 1.4942528735632183) internal successors, (130), 87 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:24:45,147 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:24:45,147 INFO L93 Difference]: Finished difference Result 170 states and 190 transitions. [2021-11-07 01:24:45,147 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-11-07 01:24:45,147 INFO L78 Accepts]: Start accepts. Automaton has has 87 states, 87 states have (on average 1.4942528735632183) internal successors, (130), 87 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 84 [2021-11-07 01:24:45,148 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:24:45,148 INFO L225 Difference]: With dead ends: 170 [2021-11-07 01:24:45,148 INFO L226 Difference]: Without dead ends: 168 [2021-11-07 01:24:45,149 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 336 GetRequests, 200 SyntacticMatches, 3 SemanticMatches, 133 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5199 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=2967, Invalid=15123, Unknown=0, NotChecked=0, Total=18090 [2021-11-07 01:24:45,149 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2021-11-07 01:24:45,209 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 88. [2021-11-07 01:24:45,209 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 87 states have (on average 1.0229885057471264) internal successors, (89), 87 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:24:45,210 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 89 transitions. [2021-11-07 01:24:45,210 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 89 transitions. Word has length 84 [2021-11-07 01:24:45,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:24:45,210 INFO L470 AbstractCegarLoop]: Abstraction has 88 states and 89 transitions. [2021-11-07 01:24:45,211 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 87 states, 87 states have (on average 1.4942528735632183) internal successors, (130), 87 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:24:45,211 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 89 transitions. [2021-11-07 01:24:45,211 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-11-07 01:24:45,211 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:24:45,212 INFO L513 BasicCegarLoop]: trace histogram [21, 21, 20, 20, 1, 1, 1, 1, 1] [2021-11-07 01:24:45,240 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2021-11-07 01:24:45,419 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable878 [2021-11-07 01:24:45,420 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:24:45,420 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:24:45,420 INFO L85 PathProgramCache]: Analyzing trace with hash 759572420, now seen corresponding path program 28 times [2021-11-07 01:24:45,420 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:24:45,420 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [410559912] [2021-11-07 01:24:45,420 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:24:45,420 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:24:45,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:24:47,459 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 532 proven. 309 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:24:47,460 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:24:47,460 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [410559912] [2021-11-07 01:24:47,460 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [410559912] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:24:47,460 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1178146384] [2021-11-07 01:24:47,460 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-07 01:24:47,460 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:24:47,460 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:24:47,461 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:24:47,462 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2021-11-07 01:24:49,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:24:49,935 INFO L263 TraceCheckSpWp]: Trace formula consists of 348 conjuncts, 89 conjunts are in the unsatisfiable core [2021-11-07 01:24:49,937 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:24:52,048 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:24:52,048 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:24:56,944 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:24:56,944 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1178146384] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:24:56,944 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [204431092] [2021-11-07 01:24:56,945 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-07 01:24:56,945 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 01:24:56,945 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-07 01:24:56,946 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-07 01:24:56,946 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-07 01:24:56,950 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:24:56,950 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:24:56,950 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:24:56,951 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-07 01:24:56,951 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:24:56,951 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:24:56,951 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-07 01:24:56,952 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 97 [2021-11-07 01:24:56,953 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_37|], 10=[|v_#valid_38|]} [2021-11-07 01:24:56,957 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:24:56,957 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 [2021-11-07 01:24:56,958 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:24:56,958 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:24:56,958 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:24:56,958 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:24:56,959 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-07 01:24:56,959 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:56,960 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:24:56,962 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:24:56,963 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:24:56,963 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:24:56,966 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:24:56,966 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 [2021-11-07 01:24:56,967 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:24:56,968 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:24:56,968 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:24:56,968 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:24:56,969 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-07 01:24:56,969 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:56,970 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:24:56,970 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:24:56,971 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 79 [2021-11-07 01:24:56,971 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-07 01:24:56,971 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:94, output treesize:79 [2021-11-07 01:24:56,973 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.1 percent of original size [2021-11-07 01:24:56,974 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-07 01:24:56,976 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:56,979 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:56,983 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:56,993 INFO L180 QuantifierPusher]: treesize reduction 3, result has 98.7 percent of original size [2021-11-07 01:24:56,996 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 229 [2021-11-07 01:24:56,999 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:57,009 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:57,010 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:57,010 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:57,010 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:57,011 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:57,012 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:57,015 INFO L180 QuantifierPusher]: treesize reduction 24, result has 69.6 percent of original size [2021-11-07 01:24:57,017 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 46 [2021-11-07 01:24:57,018 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:57,021 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:57,023 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:57,028 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:24:57,029 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 101 [2021-11-07 01:24:57,031 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:57,035 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:57,035 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:57,036 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:57,037 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:57,038 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:57,040 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-07 01:24:57,041 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-07 01:24:57,044 INFO L180 QuantifierPusher]: treesize reduction 25, result has 81.5 percent of original size [2021-11-07 01:24:57,045 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 107 [2021-11-07 01:24:57,047 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:57,052 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:57,053 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:57,054 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:57,054 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:57,054 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:57,055 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:57,055 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:57,056 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:57,057 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:24:57,060 INFO L180 QuantifierPusher]: treesize reduction 24, result has 81.7 percent of original size [2021-11-07 01:24:57,061 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 102 [2021-11-07 01:24:57,066 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-07 01:24:58,167 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-07 01:24:58,167 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-07 01:24:58,167 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 46, 46] total 113 [2021-11-07 01:24:58,167 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1621340635] [2021-11-07 01:24:58,168 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 113 states [2021-11-07 01:24:58,168 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:24:58,168 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 113 interpolants. [2021-11-07 01:24:58,169 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1854, Invalid=12188, Unknown=0, NotChecked=0, Total=14042 [2021-11-07 01:24:58,169 INFO L87 Difference]: Start difference. First operand 88 states and 89 transitions. Second operand has 113 states, 113 states have (on average 2.088495575221239) internal successors, (236), 113 states have internal predecessors, (236), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:25:11,602 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:25:11,602 INFO L93 Difference]: Finished difference Result 242 states and 267 transitions. [2021-11-07 01:25:11,603 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 114 states. [2021-11-07 01:25:11,603 INFO L78 Accepts]: Start accepts. Automaton has has 113 states, 113 states have (on average 2.088495575221239) internal successors, (236), 113 states have internal predecessors, (236), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 87 [2021-11-07 01:25:11,603 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:25:11,604 INFO L225 Difference]: With dead ends: 242 [2021-11-07 01:25:11,604 INFO L226 Difference]: Without dead ends: 174 [2021-11-07 01:25:11,607 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 394 GetRequests, 187 SyntacticMatches, 2 SemanticMatches, 205 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11361 ImplicationChecksByTransitivity, 17.7s TimeCoverageRelationStatistics Valid=5501, Invalid=37141, Unknown=0, NotChecked=0, Total=42642 [2021-11-07 01:25:11,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 174 states. [2021-11-07 01:25:11,734 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 174 to 113. [2021-11-07 01:25:11,734 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 113 states, 112 states have (on average 1.2053571428571428) internal successors, (135), 112 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) [2021-11-07 01:25:11,735 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 135 transitions. [2021-11-07 01:25:11,735 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 135 transitions. Word has length 87 [2021-11-07 01:25:11,736 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:25:11,736 INFO L470 AbstractCegarLoop]: Abstraction has 113 states and 135 transitions. [2021-11-07 01:25:11,736 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 113 states, 113 states have (on average 2.088495575221239) internal successors, (236), 113 states have internal predecessors, (236), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:25:11,736 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 135 transitions. [2021-11-07 01:25:11,737 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2021-11-07 01:25:11,737 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:25:11,737 INFO L513 BasicCegarLoop]: trace histogram [22, 22, 21, 21, 1, 1, 1, 1, 1] [2021-11-07 01:25:11,774 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2021-11-07 01:25:11,951 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable910 [2021-11-07 01:25:11,952 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:25:11,952 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:25:11,952 INFO L85 PathProgramCache]: Analyzing trace with hash 872395322, now seen corresponding path program 29 times [2021-11-07 01:25:11,952 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:25:11,952 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [915540637] [2021-11-07 01:25:11,952 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:25:11,953 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:25:12,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:25:14,021 INFO L134 CoverageAnalysis]: Checked inductivity of 925 backedges. 590 proven. 335 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:25:14,022 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:25:14,022 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [915540637] [2021-11-07 01:25:14,022 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [915540637] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:25:14,022 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [774523310] [2021-11-07 01:25:14,022 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-07 01:25:14,022 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:25:14,022 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:25:14,023 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:25:14,024 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2021-11-07 01:25:16,813 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2021-11-07 01:25:16,813 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:25:16,816 INFO L263 TraceCheckSpWp]: Trace formula consists of 363 conjuncts, 72 conjunts are in the unsatisfiable core [2021-11-07 01:25:16,818 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:25:20,249 INFO L134 CoverageAnalysis]: Checked inductivity of 925 backedges. 0 proven. 925 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:25:20,249 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:25:25,740 INFO L134 CoverageAnalysis]: Checked inductivity of 925 backedges. 0 proven. 925 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:25:25,741 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [774523310] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:25:25,741 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [353304259] [2021-11-07 01:25:25,742 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-07 01:25:25,742 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 01:25:25,742 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-07 01:25:25,742 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-07 01:25:25,743 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-07 01:25:25,745 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:25:25,745 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:25:25,745 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:25:25,746 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-07 01:25:25,746 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:25:25,746 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:25:25,746 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-07 01:25:25,747 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 97 [2021-11-07 01:25:25,748 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_38|], 10=[|v_#valid_39|]} [2021-11-07 01:25:25,753 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:25:25,754 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 [2021-11-07 01:25:25,754 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:25:25,754 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:25:25,755 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:25:25,755 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:25:25,755 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-07 01:25:25,755 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:25:25,757 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:25:25,759 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:25:25,760 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:25:25,761 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:25:25,764 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:25:25,769 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 [2021-11-07 01:25:25,770 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:25:25,771 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:25:25,772 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:25:25,772 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:25:25,772 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-07 01:25:25,773 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:25:25,776 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:25:25,777 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:25:25,777 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 79 [2021-11-07 01:25:25,778 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-07 01:25:25,778 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:94, output treesize:79 [2021-11-07 01:25:25,780 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.1 percent of original size [2021-11-07 01:25:25,782 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-07 01:25:25,783 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:25:25,787 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:25:25,799 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:25:25,810 INFO L180 QuantifierPusher]: treesize reduction 3, result has 98.7 percent of original size [2021-11-07 01:25:25,812 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 229 [2021-11-07 01:25:25,815 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:25:25,827 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:25:25,827 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:25:25,828 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:25:25,828 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:25:25,829 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:25:25,830 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:25:25,833 INFO L180 QuantifierPusher]: treesize reduction 24, result has 69.6 percent of original size [2021-11-07 01:25:25,837 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 46 [2021-11-07 01:25:25,838 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:25:25,841 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:25:25,844 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:25:25,848 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:25:25,850 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 101 [2021-11-07 01:25:25,852 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:25:25,857 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:25:25,857 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:25:25,858 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:25:25,858 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:25:25,859 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:25:25,861 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-07 01:25:25,862 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-07 01:25:25,866 INFO L180 QuantifierPusher]: treesize reduction 25, result has 81.5 percent of original size [2021-11-07 01:25:25,868 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 107 [2021-11-07 01:25:25,870 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:25:25,875 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:25:25,875 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:25:25,876 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:25:25,876 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:25:25,877 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:25:25,877 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:25:25,878 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:25:25,878 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:25:25,880 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:25:25,884 INFO L180 QuantifierPusher]: treesize reduction 24, result has 81.7 percent of original size [2021-11-07 01:25:25,886 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 102 [2021-11-07 01:25:25,891 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-07 01:25:27,066 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-07 01:25:27,066 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-07 01:25:27,066 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 48, 48] total 140 [2021-11-07 01:25:27,067 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [456828908] [2021-11-07 01:25:27,067 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 140 states [2021-11-07 01:25:27,067 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:25:27,068 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 140 interpolants. [2021-11-07 01:25:27,069 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2316, Invalid=18854, Unknown=0, NotChecked=0, Total=21170 [2021-11-07 01:25:27,069 INFO L87 Difference]: Start difference. First operand 113 states and 135 transitions. Second operand has 140 states, 140 states have (on average 1.9142857142857144) internal successors, (268), 140 states have internal predecessors, (268), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:25:38,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:25:38,303 INFO L93 Difference]: Finished difference Result 187 states and 210 transitions. [2021-11-07 01:25:38,303 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-11-07 01:25:38,303 INFO L78 Accepts]: Start accepts. Automaton has has 140 states, 140 states have (on average 1.9142857142857144) internal successors, (268), 140 states have internal predecessors, (268), 0 states have call successors, (0), 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 91 [2021-11-07 01:25:38,303 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:25:38,304 INFO L225 Difference]: With dead ends: 187 [2021-11-07 01:25:38,304 INFO L226 Difference]: Without dead ends: 116 [2021-11-07 01:25:38,307 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 367 GetRequests, 175 SyntacticMatches, 1 SemanticMatches, 191 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9808 ImplicationChecksByTransitivity, 18.5s TimeCoverageRelationStatistics Valid=4060, Invalid=32996, Unknown=0, NotChecked=0, Total=37056 [2021-11-07 01:25:38,308 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2021-11-07 01:25:38,425 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 113. [2021-11-07 01:25:38,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 113 states, 112 states have (on average 1.1964285714285714) internal successors, (134), 112 states have internal predecessors, (134), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:25:38,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 134 transitions. [2021-11-07 01:25:38,426 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 134 transitions. Word has length 91 [2021-11-07 01:25:38,426 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:25:38,426 INFO L470 AbstractCegarLoop]: Abstraction has 113 states and 134 transitions. [2021-11-07 01:25:38,427 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 140 states, 140 states have (on average 1.9142857142857144) internal successors, (268), 140 states have internal predecessors, (268), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:25:38,427 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 134 transitions. [2021-11-07 01:25:38,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2021-11-07 01:25:38,428 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:25:38,428 INFO L513 BasicCegarLoop]: trace histogram [23, 22, 21, 21, 1, 1, 1, 1, 1] [2021-11-07 01:25:38,459 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2021-11-07 01:25:38,628 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable942 [2021-11-07 01:25:38,629 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:25:38,629 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:25:38,629 INFO L85 PathProgramCache]: Analyzing trace with hash 744959578, now seen corresponding path program 30 times [2021-11-07 01:25:38,629 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:25:38,629 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [250785333] [2021-11-07 01:25:38,629 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:25:38,629 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:25:38,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:25:39,674 INFO L134 CoverageAnalysis]: Checked inductivity of 948 backedges. 231 proven. 717 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:25:39,674 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:25:39,675 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [250785333] [2021-11-07 01:25:39,675 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [250785333] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:25:39,675 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1380304092] [2021-11-07 01:25:39,675 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-07 01:25:39,675 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:25:39,675 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:25:39,676 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:25:39,693 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2021-11-07 01:25:42,709 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-07 01:25:42,709 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:25:42,712 INFO L263 TraceCheckSpWp]: Trace formula consists of 368 conjuncts, 72 conjunts are in the unsatisfiable core [2021-11-07 01:25:42,714 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:25:44,010 INFO L134 CoverageAnalysis]: Checked inductivity of 948 backedges. 0 proven. 948 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:25:44,010 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:25:45,315 INFO L134 CoverageAnalysis]: Checked inductivity of 948 backedges. 0 proven. 948 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:25:45,315 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1380304092] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:25:45,316 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1569784387] [2021-11-07 01:25:45,317 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-07 01:25:45,317 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 01:25:45,317 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-07 01:25:45,318 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-07 01:25:45,318 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-07 01:25:45,320 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:25:45,320 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:25:45,320 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:25:45,321 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-07 01:25:45,321 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:25:45,321 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:25:45,322 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-07 01:25:45,322 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 97 [2021-11-07 01:25:45,324 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_39|], 10=[|v_#valid_40|]} [2021-11-07 01:25:45,328 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:25:45,328 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 [2021-11-07 01:25:45,329 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:25:45,329 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:25:45,329 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:25:45,330 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:25:45,330 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-07 01:25:45,330 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:25:45,332 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:25:45,334 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:25:45,335 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:25:45,336 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:25:45,340 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:25:45,341 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 [2021-11-07 01:25:45,341 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:25:45,342 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:25:45,343 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:25:45,343 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:25:45,343 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-07 01:25:45,343 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:25:45,345 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:25:45,345 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:25:45,346 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 79 [2021-11-07 01:25:45,346 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-07 01:25:45,346 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:94, output treesize:79 [2021-11-07 01:25:45,348 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.1 percent of original size [2021-11-07 01:25:45,350 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-07 01:25:45,355 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:25:45,359 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:25:45,363 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:25:45,372 INFO L180 QuantifierPusher]: treesize reduction 3, result has 98.7 percent of original size [2021-11-07 01:25:45,375 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 229 [2021-11-07 01:25:45,378 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:25:45,389 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:25:45,389 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:25:45,390 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:25:45,391 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:25:45,392 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:25:45,394 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:25:45,396 INFO L180 QuantifierPusher]: treesize reduction 24, result has 69.6 percent of original size [2021-11-07 01:25:45,397 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 46 [2021-11-07 01:25:45,399 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:25:45,401 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:25:45,404 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:25:45,409 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:25:45,410 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 101 [2021-11-07 01:25:45,412 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:25:45,417 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:25:45,417 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:25:45,418 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:25:45,418 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:25:45,420 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:25:45,422 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-07 01:25:45,423 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-07 01:25:45,427 INFO L180 QuantifierPusher]: treesize reduction 25, result has 81.5 percent of original size [2021-11-07 01:25:45,428 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 107 [2021-11-07 01:25:45,430 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:25:45,435 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:25:45,437 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:25:45,440 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:25:45,441 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:25:45,442 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:25:45,442 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:25:45,443 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:25:45,443 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:25:45,445 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:25:45,448 INFO L180 QuantifierPusher]: treesize reduction 24, result has 81.7 percent of original size [2021-11-07 01:25:45,450 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 102 [2021-11-07 01:25:45,454 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-07 01:25:46,324 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-07 01:25:46,325 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-07 01:25:46,325 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 95 [2021-11-07 01:25:46,325 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2112836100] [2021-11-07 01:25:46,325 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 95 states [2021-11-07 01:25:46,325 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:25:46,326 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 95 interpolants. [2021-11-07 01:25:46,327 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1480, Invalid=8620, Unknown=0, NotChecked=0, Total=10100 [2021-11-07 01:25:46,327 INFO L87 Difference]: Start difference. First operand 113 states and 134 transitions. Second operand has 95 states, 95 states have (on average 1.4947368421052631) internal successors, (142), 95 states have internal predecessors, (142), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:25:48,478 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:25:48,478 INFO L93 Difference]: Finished difference Result 186 states and 208 transitions. [2021-11-07 01:25:48,478 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-11-07 01:25:48,478 INFO L78 Accepts]: Start accepts. Automaton has has 95 states, 95 states have (on average 1.4947368421052631) internal successors, (142), 95 states have internal predecessors, (142), 0 states have call successors, (0), 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 [2021-11-07 01:25:48,479 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:25:48,479 INFO L225 Difference]: With dead ends: 186 [2021-11-07 01:25:48,480 INFO L226 Difference]: Without dead ends: 184 [2021-11-07 01:25:48,481 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 368 GetRequests, 220 SyntacticMatches, 3 SemanticMatches, 145 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6180 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=3523, Invalid=17939, Unknown=0, NotChecked=0, Total=21462 [2021-11-07 01:25:48,481 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2021-11-07 01:25:48,575 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 96. [2021-11-07 01:25:48,575 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 95 states have (on average 1.0210526315789474) internal successors, (97), 95 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:25:48,576 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 97 transitions. [2021-11-07 01:25:48,576 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 97 transitions. Word has length 92 [2021-11-07 01:25:48,576 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:25:48,576 INFO L470 AbstractCegarLoop]: Abstraction has 96 states and 97 transitions. [2021-11-07 01:25:48,577 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 95 states, 95 states have (on average 1.4947368421052631) internal successors, (142), 95 states have internal predecessors, (142), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:25:48,577 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 97 transitions. [2021-11-07 01:25:48,577 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-11-07 01:25:48,578 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:25:48,578 INFO L513 BasicCegarLoop]: trace histogram [23, 23, 22, 22, 1, 1, 1, 1, 1] [2021-11-07 01:25:48,625 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2021-11-07 01:25:48,791 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable974,34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:25:48,792 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:25:48,792 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:25:48,792 INFO L85 PathProgramCache]: Analyzing trace with hash 999595012, now seen corresponding path program 31 times [2021-11-07 01:25:48,792 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:25:48,792 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [822995974] [2021-11-07 01:25:48,792 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:25:48,792 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:25:48,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:25:50,970 INFO L134 CoverageAnalysis]: Checked inductivity of 1013 backedges. 651 proven. 362 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:25:50,970 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:25:50,970 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [822995974] [2021-11-07 01:25:50,970 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [822995974] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:25:50,970 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1638257348] [2021-11-07 01:25:50,970 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-07 01:25:50,971 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:25:50,971 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:25:50,971 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:25:50,976 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2021-11-07 01:25:54,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:25:54,029 INFO L263 TraceCheckSpWp]: Trace formula consists of 378 conjuncts, 97 conjunts are in the unsatisfiable core [2021-11-07 01:25:54,031 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:25:56,397 INFO L134 CoverageAnalysis]: Checked inductivity of 1013 backedges. 0 proven. 1013 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:25:56,397 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:26:02,017 INFO L134 CoverageAnalysis]: Checked inductivity of 1013 backedges. 0 proven. 1013 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:26:02,017 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1638257348] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:26:02,018 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2114271341] [2021-11-07 01:26:02,019 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-07 01:26:02,019 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 01:26:02,019 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-07 01:26:02,019 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-07 01:26:02,019 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-07 01:26:02,032 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:26:02,033 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:26:02,033 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:26:02,034 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-07 01:26:02,034 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:26:02,035 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:26:02,035 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-07 01:26:02,037 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 97 [2021-11-07 01:26:02,038 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_40|], 10=[|v_#valid_41|]} [2021-11-07 01:26:02,044 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:26:02,045 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 [2021-11-07 01:26:02,046 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:26:02,046 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:26:02,047 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:26:02,047 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:26:02,048 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-07 01:26:02,048 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:02,050 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:26:02,053 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:26:02,054 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:26:02,055 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:26:02,059 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:26:02,061 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 [2021-11-07 01:26:02,061 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:26:02,063 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:26:02,063 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:26:02,064 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:26:02,064 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-07 01:26:02,064 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:02,066 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:26:02,067 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:26:02,068 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 79 [2021-11-07 01:26:02,068 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-07 01:26:02,069 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:94, output treesize:79 [2021-11-07 01:26:02,074 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.1 percent of original size [2021-11-07 01:26:02,076 INFO L185 QuantifierPusher]: treesize reduction 5, result has 94.4 percent of original size 85 [2021-11-07 01:26:02,079 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:02,083 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:02,087 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:02,096 INFO L180 QuantifierPusher]: treesize reduction 3, result has 98.7 percent of original size [2021-11-07 01:26:02,099 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 227 [2021-11-07 01:26:02,102 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:02,112 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:02,131 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:02,132 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:02,133 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:02,133 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:02,135 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:02,138 INFO L180 QuantifierPusher]: treesize reduction 24, result has 69.6 percent of original size [2021-11-07 01:26:02,139 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 46 [2021-11-07 01:26:02,140 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:02,143 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:02,145 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:02,150 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:26:02,152 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 101 [2021-11-07 01:26:02,154 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:02,158 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:02,159 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:02,160 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:02,161 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:02,162 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:02,164 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-07 01:26:02,165 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-07 01:26:02,169 INFO L180 QuantifierPusher]: treesize reduction 25, result has 81.5 percent of original size [2021-11-07 01:26:02,170 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 107 [2021-11-07 01:26:02,172 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:02,177 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:02,178 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:02,178 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:02,179 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:02,179 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:02,180 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:02,181 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:02,181 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:02,183 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:02,186 INFO L180 QuantifierPusher]: treesize reduction 24, result has 81.7 percent of original size [2021-11-07 01:26:02,188 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 102 [2021-11-07 01:26:02,193 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-07 01:26:03,348 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-07 01:26:03,348 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-07 01:26:03,348 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 50, 50] total 123 [2021-11-07 01:26:03,348 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1481716609] [2021-11-07 01:26:03,349 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 123 states [2021-11-07 01:26:03,349 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:26:03,350 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 123 interpolants. [2021-11-07 01:26:03,352 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2187, Invalid=14325, Unknown=0, NotChecked=0, Total=16512 [2021-11-07 01:26:03,352 INFO L87 Difference]: Start difference. First operand 96 states and 97 transitions. Second operand has 123 states, 123 states have (on average 2.097560975609756) internal successors, (258), 123 states have internal predecessors, (258), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:26:19,461 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:26:19,461 INFO L93 Difference]: Finished difference Result 264 states and 291 transitions. [2021-11-07 01:26:19,461 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 124 states. [2021-11-07 01:26:19,461 INFO L78 Accepts]: Start accepts. Automaton has has 123 states, 123 states have (on average 2.097560975609756) internal successors, (258), 123 states have internal predecessors, (258), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 95 [2021-11-07 01:26:19,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:26:19,463 INFO L225 Difference]: With dead ends: 264 [2021-11-07 01:26:19,463 INFO L226 Difference]: Without dead ends: 190 [2021-11-07 01:26:19,465 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 430 GetRequests, 205 SyntacticMatches, 2 SemanticMatches, 223 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13453 ImplicationChecksByTransitivity, 20.7s TimeCoverageRelationStatistics Valid=6500, Invalid=43900, Unknown=0, NotChecked=0, Total=50400 [2021-11-07 01:26:19,465 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2021-11-07 01:26:19,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 123. [2021-11-07 01:26:19,637 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 123 states, 122 states have (on average 1.2049180327868851) internal successors, (147), 122 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) [2021-11-07 01:26:19,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 147 transitions. [2021-11-07 01:26:19,638 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 147 transitions. Word has length 95 [2021-11-07 01:26:19,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:26:19,638 INFO L470 AbstractCegarLoop]: Abstraction has 123 states and 147 transitions. [2021-11-07 01:26:19,639 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 123 states, 123 states have (on average 2.097560975609756) internal successors, (258), 123 states have internal predecessors, (258), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:26:19,639 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 147 transitions. [2021-11-07 01:26:19,640 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-11-07 01:26:19,640 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:26:19,640 INFO L513 BasicCegarLoop]: trace histogram [24, 24, 23, 23, 1, 1, 1, 1, 1] [2021-11-07 01:26:19,672 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2021-11-07 01:26:19,843 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1006,35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:26:19,844 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:26:19,844 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:26:19,844 INFO L85 PathProgramCache]: Analyzing trace with hash -1766066694, now seen corresponding path program 32 times [2021-11-07 01:26:19,844 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:26:19,844 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1272458222] [2021-11-07 01:26:19,844 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:26:19,844 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:26:19,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:26:22,273 INFO L134 CoverageAnalysis]: Checked inductivity of 1105 backedges. 715 proven. 390 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:26:22,274 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:26:22,274 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1272458222] [2021-11-07 01:26:22,274 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1272458222] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:26:22,274 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1202435321] [2021-11-07 01:26:22,274 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-07 01:26:22,274 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:26:22,274 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:26:22,275 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:26:22,276 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2021-11-07 01:26:25,559 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2021-11-07 01:26:25,559 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:26:25,562 INFO L263 TraceCheckSpWp]: Trace formula consists of 393 conjuncts, 78 conjunts are in the unsatisfiable core [2021-11-07 01:26:25,565 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:26:29,651 INFO L134 CoverageAnalysis]: Checked inductivity of 1105 backedges. 0 proven. 1105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:26:29,651 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:26:35,922 INFO L134 CoverageAnalysis]: Checked inductivity of 1105 backedges. 0 proven. 1105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:26:35,922 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1202435321] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:26:35,923 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1218666147] [2021-11-07 01:26:35,924 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-07 01:26:35,924 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 01:26:35,924 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-07 01:26:35,924 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-07 01:26:35,924 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-07 01:26:35,926 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:26:35,926 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:26:35,927 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:26:35,927 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-07 01:26:35,927 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:26:35,928 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:26:35,928 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-07 01:26:35,929 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 97 [2021-11-07 01:26:35,930 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_41|], 10=[|v_#valid_42|]} [2021-11-07 01:26:35,934 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:26:35,935 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 [2021-11-07 01:26:35,935 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:26:35,935 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:26:35,936 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:26:35,936 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:26:35,936 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-07 01:26:35,936 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:35,938 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:26:35,940 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:26:35,941 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:26:35,942 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:26:35,944 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:26:35,945 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 [2021-11-07 01:26:35,946 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:26:35,947 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:26:35,947 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:26:35,948 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:26:35,948 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-07 01:26:35,948 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:35,949 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:26:35,950 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:26:35,950 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 79 [2021-11-07 01:26:35,951 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-07 01:26:35,951 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:94, output treesize:79 [2021-11-07 01:26:35,953 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.1 percent of original size [2021-11-07 01:26:35,955 INFO L185 QuantifierPusher]: treesize reduction 5, result has 94.4 percent of original size 85 [2021-11-07 01:26:35,956 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:35,960 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:35,964 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:35,973 INFO L180 QuantifierPusher]: treesize reduction 3, result has 98.7 percent of original size [2021-11-07 01:26:35,976 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 227 [2021-11-07 01:26:35,979 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:35,989 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:35,990 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:35,990 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:35,991 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:35,991 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:35,994 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:35,996 INFO L180 QuantifierPusher]: treesize reduction 24, result has 69.6 percent of original size [2021-11-07 01:26:35,998 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 46 [2021-11-07 01:26:35,999 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:36,002 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:36,004 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:36,009 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:26:36,011 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 101 [2021-11-07 01:26:36,013 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:36,018 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:36,018 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:36,019 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:36,019 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:36,022 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:36,024 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-07 01:26:36,025 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-07 01:26:36,029 INFO L180 QuantifierPusher]: treesize reduction 25, result has 81.5 percent of original size [2021-11-07 01:26:36,031 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 107 [2021-11-07 01:26:36,032 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:36,037 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:36,038 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:36,038 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:36,039 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:36,039 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:36,040 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:36,040 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:36,041 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:36,042 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:36,047 INFO L180 QuantifierPusher]: treesize reduction 24, result has 81.7 percent of original size [2021-11-07 01:26:36,048 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 102 [2021-11-07 01:26:36,053 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-07 01:26:37,298 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-07 01:26:37,298 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-07 01:26:37,298 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 52, 52] total 152 [2021-11-07 01:26:37,298 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1523812132] [2021-11-07 01:26:37,299 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 152 states [2021-11-07 01:26:37,299 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:26:37,300 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 152 interpolants. [2021-11-07 01:26:37,301 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2714, Invalid=22092, Unknown=0, NotChecked=0, Total=24806 [2021-11-07 01:26:37,302 INFO L87 Difference]: Start difference. First operand 123 states and 147 transitions. Second operand has 152 states, 152 states have (on average 1.9210526315789473) internal successors, (292), 152 states have internal predecessors, (292), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:26:50,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:26:50,128 INFO L93 Difference]: Finished difference Result 203 states and 228 transitions. [2021-11-07 01:26:50,129 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2021-11-07 01:26:50,129 INFO L78 Accepts]: Start accepts. Automaton has has 152 states, 152 states have (on average 1.9210526315789473) internal successors, (292), 152 states have internal predecessors, (292), 0 states have call successors, (0), 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 99 [2021-11-07 01:26:50,129 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:26:50,130 INFO L225 Difference]: With dead ends: 203 [2021-11-07 01:26:50,130 INFO L226 Difference]: Without dead ends: 126 [2021-11-07 01:26:50,133 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 399 GetRequests, 191 SyntacticMatches, 1 SemanticMatches, 207 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11514 ImplicationChecksByTransitivity, 21.8s TimeCoverageRelationStatistics Valid=4758, Invalid=38714, Unknown=0, NotChecked=0, Total=43472 [2021-11-07 01:26:50,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2021-11-07 01:26:50,286 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 123. [2021-11-07 01:26:50,287 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 123 states, 122 states have (on average 1.1967213114754098) internal successors, (146), 122 states have internal predecessors, (146), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:26:50,287 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 146 transitions. [2021-11-07 01:26:50,287 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 146 transitions. Word has length 99 [2021-11-07 01:26:50,288 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:26:50,288 INFO L470 AbstractCegarLoop]: Abstraction has 123 states and 146 transitions. [2021-11-07 01:26:50,288 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 152 states, 152 states have (on average 1.9210526315789473) internal successors, (292), 152 states have internal predecessors, (292), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:26:50,288 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 146 transitions. [2021-11-07 01:26:50,288 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2021-11-07 01:26:50,288 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:26:50,289 INFO L513 BasicCegarLoop]: trace histogram [25, 24, 23, 23, 1, 1, 1, 1, 1] [2021-11-07 01:26:50,324 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2021-11-07 01:26:50,489 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1038 [2021-11-07 01:26:50,489 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:26:50,489 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:26:50,490 INFO L85 PathProgramCache]: Analyzing trace with hash -428518886, now seen corresponding path program 33 times [2021-11-07 01:26:50,490 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:26:50,490 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [828888180] [2021-11-07 01:26:50,490 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:26:50,490 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:26:50,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:26:51,611 INFO L134 CoverageAnalysis]: Checked inductivity of 1130 backedges. 276 proven. 854 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:26:51,612 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:26:51,612 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [828888180] [2021-11-07 01:26:51,612 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [828888180] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:26:51,612 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1101245184] [2021-11-07 01:26:51,612 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-07 01:26:51,613 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:26:51,613 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:26:51,614 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:26:51,622 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2021-11-07 01:26:55,163 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-07 01:26:55,164 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:26:55,167 INFO L263 TraceCheckSpWp]: Trace formula consists of 398 conjuncts, 78 conjunts are in the unsatisfiable core [2021-11-07 01:26:55,169 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:26:56,726 INFO L134 CoverageAnalysis]: Checked inductivity of 1130 backedges. 0 proven. 1130 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:26:56,726 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:26:58,114 INFO L134 CoverageAnalysis]: Checked inductivity of 1130 backedges. 0 proven. 1130 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:26:58,115 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1101245184] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:26:58,115 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1980714724] [2021-11-07 01:26:58,115 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-07 01:26:58,116 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 01:26:58,116 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-07 01:26:58,116 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-07 01:26:58,116 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-07 01:26:58,117 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:26:58,118 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:26:58,118 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:26:58,118 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-07 01:26:58,119 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:26:58,119 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:26:58,119 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-07 01:26:58,120 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 97 [2021-11-07 01:26:58,121 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_42|], 10=[|v_#valid_43|]} [2021-11-07 01:26:58,130 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:26:58,131 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 [2021-11-07 01:26:58,131 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:26:58,132 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:26:58,132 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:26:58,132 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:26:58,132 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-07 01:26:58,133 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:58,134 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:26:58,136 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:26:58,137 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:26:58,137 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:26:58,140 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:26:58,140 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 [2021-11-07 01:26:58,141 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:26:58,142 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:26:58,142 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:26:58,142 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:26:58,143 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-07 01:26:58,143 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:58,144 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:26:58,144 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:26:58,145 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 79 [2021-11-07 01:26:58,145 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-07 01:26:58,145 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:94, output treesize:79 [2021-11-07 01:26:58,147 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.1 percent of original size [2021-11-07 01:26:58,148 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-07 01:26:58,150 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:58,153 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:58,156 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:58,165 INFO L180 QuantifierPusher]: treesize reduction 3, result has 98.7 percent of original size [2021-11-07 01:26:58,167 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 229 [2021-11-07 01:26:58,170 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:58,180 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:58,181 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:58,181 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:58,182 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:58,182 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:58,184 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:58,186 INFO L180 QuantifierPusher]: treesize reduction 24, result has 69.6 percent of original size [2021-11-07 01:26:58,187 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 46 [2021-11-07 01:26:58,189 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:58,191 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:58,194 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:58,199 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:26:58,200 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 101 [2021-11-07 01:26:58,202 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:58,207 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:58,210 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:58,210 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:58,211 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:58,212 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:58,214 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-07 01:26:58,215 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-07 01:26:58,219 INFO L180 QuantifierPusher]: treesize reduction 25, result has 81.5 percent of original size [2021-11-07 01:26:58,221 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 107 [2021-11-07 01:26:58,223 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:58,228 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:58,229 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:58,230 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:58,230 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:58,243 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:58,244 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:58,245 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:58,246 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:58,249 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:26:58,254 INFO L180 QuantifierPusher]: treesize reduction 24, result has 81.7 percent of original size [2021-11-07 01:26:58,256 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 102 [2021-11-07 01:26:58,261 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-07 01:26:59,139 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-07 01:26:59,139 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-07 01:26:59,139 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52, 52] total 103 [2021-11-07 01:26:59,139 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [114826243] [2021-11-07 01:26:59,140 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 103 states [2021-11-07 01:26:59,140 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:26:59,140 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 103 interpolants. [2021-11-07 01:26:59,142 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1731, Invalid=10041, Unknown=0, NotChecked=0, Total=11772 [2021-11-07 01:26:59,142 INFO L87 Difference]: Start difference. First operand 123 states and 146 transitions. Second operand has 103 states, 103 states have (on average 1.4951456310679612) internal successors, (154), 103 states have internal predecessors, (154), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:27:01,672 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:27:01,672 INFO L93 Difference]: Finished difference Result 202 states and 226 transitions. [2021-11-07 01:27:01,672 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2021-11-07 01:27:01,673 INFO L78 Accepts]: Start accepts. Automaton has has 103 states, 103 states have (on average 1.4951456310679612) internal successors, (154), 103 states have internal predecessors, (154), 0 states have call successors, (0), 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 100 [2021-11-07 01:27:01,673 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:27:01,674 INFO L225 Difference]: With dead ends: 202 [2021-11-07 01:27:01,674 INFO L226 Difference]: Without dead ends: 200 [2021-11-07 01:27:01,677 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 400 GetRequests, 240 SyntacticMatches, 3 SemanticMatches, 157 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7245 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=4127, Invalid=20995, Unknown=0, NotChecked=0, Total=25122 [2021-11-07 01:27:01,677 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 200 states. [2021-11-07 01:27:01,771 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 200 to 104. [2021-11-07 01:27:01,772 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 103 states have (on average 1.0194174757281553) internal successors, (105), 103 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) [2021-11-07 01:27:01,772 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 105 transitions. [2021-11-07 01:27:01,772 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 105 transitions. Word has length 100 [2021-11-07 01:27:01,772 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:27:01,772 INFO L470 AbstractCegarLoop]: Abstraction has 104 states and 105 transitions. [2021-11-07 01:27:01,773 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 103 states, 103 states have (on average 1.4951456310679612) internal successors, (154), 103 states have internal predecessors, (154), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:27:01,773 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 105 transitions. [2021-11-07 01:27:01,773 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2021-11-07 01:27:01,773 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:27:01,773 INFO L513 BasicCegarLoop]: trace histogram [25, 25, 24, 24, 1, 1, 1, 1, 1] [2021-11-07 01:27:01,808 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Forceful destruction successful, exit code 0 [2021-11-07 01:27:01,974 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1070 [2021-11-07 01:27:01,974 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:27:01,974 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:27:01,974 INFO L85 PathProgramCache]: Analyzing trace with hash -1358503868, now seen corresponding path program 34 times [2021-11-07 01:27:01,974 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:27:01,975 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1123106216] [2021-11-07 01:27:01,975 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:27:01,975 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:27:02,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:27:04,673 INFO L134 CoverageAnalysis]: Checked inductivity of 1201 backedges. 782 proven. 419 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:27:04,674 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:27:04,674 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1123106216] [2021-11-07 01:27:04,674 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1123106216] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:27:04,674 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1818413804] [2021-11-07 01:27:04,674 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-07 01:27:04,674 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:27:04,674 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:27:04,675 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:27:04,676 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2021-11-07 01:27:08,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:27:08,220 INFO L263 TraceCheckSpWp]: Trace formula consists of 408 conjuncts, 105 conjunts are in the unsatisfiable core [2021-11-07 01:27:08,222 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:27:10,877 INFO L134 CoverageAnalysis]: Checked inductivity of 1201 backedges. 0 proven. 1201 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:27:10,878 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:27:17,282 INFO L134 CoverageAnalysis]: Checked inductivity of 1201 backedges. 0 proven. 1201 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:27:17,283 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1818413804] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:27:17,283 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1063728429] [2021-11-07 01:27:17,284 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-07 01:27:17,285 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 01:27:17,285 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-07 01:27:17,285 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-07 01:27:17,285 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-07 01:27:17,288 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:27:17,289 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:27:17,289 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:27:17,290 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-07 01:27:17,290 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:27:17,290 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:27:17,291 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-07 01:27:17,291 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 97 [2021-11-07 01:27:17,293 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_43|], 10=[|v_#valid_44|]} [2021-11-07 01:27:17,297 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:27:17,298 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 [2021-11-07 01:27:17,298 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:27:17,298 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:27:17,299 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:27:17,299 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:27:17,299 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-07 01:27:17,300 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:27:17,301 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:27:17,303 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:27:17,304 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:27:17,305 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:27:17,308 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:27:17,308 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 [2021-11-07 01:27:17,309 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:27:17,310 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:27:17,310 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:27:17,311 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:27:17,311 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-07 01:27:17,311 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:27:17,312 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:27:17,313 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:27:17,314 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 79 [2021-11-07 01:27:17,314 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-07 01:27:17,314 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:94, output treesize:79 [2021-11-07 01:27:17,316 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.1 percent of original size [2021-11-07 01:27:17,318 INFO L185 QuantifierPusher]: treesize reduction 5, result has 94.4 percent of original size 85 [2021-11-07 01:27:17,319 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:27:17,323 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:27:17,327 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:27:17,336 INFO L180 QuantifierPusher]: treesize reduction 3, result has 98.7 percent of original size [2021-11-07 01:27:17,339 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 227 [2021-11-07 01:27:17,342 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:27:17,352 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:27:17,353 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:27:17,353 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:27:17,354 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:27:17,354 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:27:17,356 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:27:17,358 INFO L180 QuantifierPusher]: treesize reduction 24, result has 69.6 percent of original size [2021-11-07 01:27:17,360 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 46 [2021-11-07 01:27:17,372 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:27:17,376 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:27:17,381 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:27:17,389 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:27:17,391 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 101 [2021-11-07 01:27:17,394 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:27:17,401 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:27:17,402 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:27:17,403 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:27:17,404 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:27:17,405 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:27:17,409 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-07 01:27:17,410 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-07 01:27:17,416 INFO L180 QuantifierPusher]: treesize reduction 25, result has 81.5 percent of original size [2021-11-07 01:27:17,419 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-07 01:27:17,421 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:27:17,429 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:27:17,430 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:27:17,431 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:27:17,432 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:27:17,432 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:27:17,433 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:27:17,434 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:27:17,435 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:27:17,437 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:27:17,442 INFO L180 QuantifierPusher]: treesize reduction 24, result has 81.7 percent of original size [2021-11-07 01:27:17,445 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 102 [2021-11-07 01:27:17,452 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-07 01:27:18,802 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-07 01:27:18,802 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-07 01:27:18,803 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 54, 54] total 133 [2021-11-07 01:27:18,803 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [8656831] [2021-11-07 01:27:18,803 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 133 states [2021-11-07 01:27:18,803 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:27:18,804 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 133 interpolants. [2021-11-07 01:27:18,805 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2548, Invalid=16634, Unknown=0, NotChecked=0, Total=19182 [2021-11-07 01:27:18,805 INFO L87 Difference]: Start difference. First operand 104 states and 105 transitions. Second operand has 133 states, 133 states have (on average 2.1052631578947367) internal successors, (280), 133 states have internal predecessors, (280), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:27:38,432 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:27:38,432 INFO L93 Difference]: Finished difference Result 286 states and 315 transitions. [2021-11-07 01:27:38,433 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 134 states. [2021-11-07 01:27:38,433 INFO L78 Accepts]: Start accepts. Automaton has has 133 states, 133 states have (on average 2.1052631578947367) internal successors, (280), 133 states have internal predecessors, (280), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 103 [2021-11-07 01:27:38,433 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:27:38,435 INFO L225 Difference]: With dead ends: 286 [2021-11-07 01:27:38,435 INFO L226 Difference]: Without dead ends: 206 [2021-11-07 01:27:38,440 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 466 GetRequests, 223 SyntacticMatches, 2 SemanticMatches, 241 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15721 ImplicationChecksByTransitivity, 25.1s TimeCoverageRelationStatistics Valid=7583, Invalid=51223, Unknown=0, NotChecked=0, Total=58806 [2021-11-07 01:27:38,440 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 206 states. [2021-11-07 01:27:38,623 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 206 to 133. [2021-11-07 01:27:38,623 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 132 states have (on average 1.2045454545454546) internal successors, (159), 132 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) [2021-11-07 01:27:38,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 159 transitions. [2021-11-07 01:27:38,624 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 159 transitions. Word has length 103 [2021-11-07 01:27:38,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:27:38,624 INFO L470 AbstractCegarLoop]: Abstraction has 133 states and 159 transitions. [2021-11-07 01:27:38,624 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 133 states, 133 states have (on average 2.1052631578947367) internal successors, (280), 133 states have internal predecessors, (280), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:27:38,624 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 159 transitions. [2021-11-07 01:27:38,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-11-07 01:27:38,625 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:27:38,625 INFO L513 BasicCegarLoop]: trace histogram [26, 26, 25, 25, 1, 1, 1, 1, 1] [2021-11-07 01:27:38,663 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Forceful destruction successful, exit code 0 [2021-11-07 01:27:38,835 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1102,38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:27:38,836 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:27:38,836 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:27:38,836 INFO L85 PathProgramCache]: Analyzing trace with hash 937585082, now seen corresponding path program 35 times [2021-11-07 01:27:38,837 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:27:38,837 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2055980754] [2021-11-07 01:27:38,837 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:27:38,837 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:27:38,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:27:41,856 INFO L134 CoverageAnalysis]: Checked inductivity of 1301 backedges. 852 proven. 449 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:27:41,856 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:27:41,857 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2055980754] [2021-11-07 01:27:41,857 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2055980754] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:27:41,857 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [107926220] [2021-11-07 01:27:41,857 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-07 01:27:41,857 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:27:41,857 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:27:41,858 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:27:41,859 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2021-11-07 01:27:45,913 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 26 check-sat command(s) [2021-11-07 01:27:45,913 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:27:45,916 INFO L263 TraceCheckSpWp]: Trace formula consists of 423 conjuncts, 84 conjunts are in the unsatisfiable core [2021-11-07 01:27:45,918 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:27:50,900 INFO L134 CoverageAnalysis]: Checked inductivity of 1301 backedges. 0 proven. 1301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:27:50,901 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:27:58,410 INFO L134 CoverageAnalysis]: Checked inductivity of 1301 backedges. 0 proven. 1301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:27:58,410 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [107926220] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:27:58,410 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2032267651] [2021-11-07 01:27:58,411 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-07 01:27:58,411 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 01:27:58,412 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-07 01:27:58,412 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-07 01:27:58,412 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-07 01:27:58,428 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:27:58,429 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:27:58,429 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:27:58,430 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-07 01:27:58,430 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:27:58,431 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:27:58,431 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-07 01:27:58,432 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 97 [2021-11-07 01:27:58,434 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_44|], 10=[|v_#valid_45|]} [2021-11-07 01:27:58,442 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:27:58,443 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 [2021-11-07 01:27:58,443 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:27:58,444 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:27:58,444 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:27:58,445 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:27:58,445 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-07 01:27:58,447 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:27:58,449 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:27:58,452 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:27:58,453 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:27:58,454 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:27:58,458 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:27:58,459 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 [2021-11-07 01:27:58,460 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:27:58,462 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:27:58,463 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:27:58,463 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:27:58,464 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-07 01:27:58,464 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:27:58,466 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:27:58,467 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:27:58,468 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 79 [2021-11-07 01:27:58,468 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-07 01:27:58,468 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:94, output treesize:79 [2021-11-07 01:27:58,472 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.1 percent of original size [2021-11-07 01:27:58,474 INFO L185 QuantifierPusher]: treesize reduction 5, result has 94.4 percent of original size 85 [2021-11-07 01:27:58,476 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:27:58,482 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:27:58,488 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:27:58,503 INFO L180 QuantifierPusher]: treesize reduction 3, result has 98.7 percent of original size [2021-11-07 01:27:58,507 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 227 [2021-11-07 01:27:58,512 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:27:58,528 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:27:58,529 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:27:58,530 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:27:58,531 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:27:58,531 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:27:58,534 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:27:58,537 INFO L180 QuantifierPusher]: treesize reduction 24, result has 69.6 percent of original size [2021-11-07 01:27:58,539 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 46 [2021-11-07 01:27:58,541 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:27:58,544 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:27:58,549 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:27:58,557 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:27:58,560 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 101 [2021-11-07 01:27:58,562 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:27:58,570 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:27:58,571 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:27:58,571 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:27:58,572 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:27:58,574 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:27:58,577 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-07 01:27:58,579 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-07 01:27:58,584 INFO L180 QuantifierPusher]: treesize reduction 25, result has 81.5 percent of original size [2021-11-07 01:27:58,587 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 107 [2021-11-07 01:27:58,589 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:27:58,597 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:27:58,598 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:27:58,599 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:27:58,600 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:27:58,601 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:27:58,601 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:27:58,602 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:27:58,603 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:27:58,605 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:27:58,610 INFO L180 QuantifierPusher]: treesize reduction 24, result has 81.7 percent of original size [2021-11-07 01:27:58,612 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 102 [2021-11-07 01:27:58,619 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-07 01:28:00,092 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-07 01:28:00,093 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-07 01:28:00,093 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 56, 56] total 164 [2021-11-07 01:28:00,093 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [173731411] [2021-11-07 01:28:00,094 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 164 states [2021-11-07 01:28:00,094 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:28:00,095 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 164 interpolants. [2021-11-07 01:28:00,097 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3144, Invalid=25586, Unknown=0, NotChecked=0, Total=28730 [2021-11-07 01:28:00,097 INFO L87 Difference]: Start difference. First operand 133 states and 159 transitions. Second operand has 164 states, 164 states have (on average 1.9268292682926829) internal successors, (316), 164 states have internal predecessors, (316), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:28:16,858 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:28:16,858 INFO L93 Difference]: Finished difference Result 219 states and 246 transitions. [2021-11-07 01:28:16,859 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2021-11-07 01:28:16,859 INFO L78 Accepts]: Start accepts. Automaton has has 164 states, 164 states have (on average 1.9268292682926829) internal successors, (316), 164 states have internal predecessors, (316), 0 states have call successors, (0), 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 107 [2021-11-07 01:28:16,859 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:28:16,860 INFO L225 Difference]: With dead ends: 219 [2021-11-07 01:28:16,860 INFO L226 Difference]: Without dead ends: 136 [2021-11-07 01:28:16,863 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 431 GetRequests, 207 SyntacticMatches, 1 SemanticMatches, 223 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13356 ImplicationChecksByTransitivity, 27.3s TimeCoverageRelationStatistics Valid=5512, Invalid=44888, Unknown=0, NotChecked=0, Total=50400 [2021-11-07 01:28:16,863 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2021-11-07 01:28:17,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 133. [2021-11-07 01:28:17,070 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 132 states have (on average 1.196969696969697) internal successors, (158), 132 states have internal predecessors, (158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:28:17,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 158 transitions. [2021-11-07 01:28:17,070 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 158 transitions. Word has length 107 [2021-11-07 01:28:17,070 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:28:17,070 INFO L470 AbstractCegarLoop]: Abstraction has 133 states and 158 transitions. [2021-11-07 01:28:17,071 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 164 states, 164 states have (on average 1.9268292682926829) internal successors, (316), 164 states have internal predecessors, (316), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:28:17,071 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 158 transitions. [2021-11-07 01:28:17,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2021-11-07 01:28:17,071 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:28:17,072 INFO L513 BasicCegarLoop]: trace histogram [27, 26, 25, 25, 1, 1, 1, 1, 1] [2021-11-07 01:28:17,111 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Ended with exit code 0 [2021-11-07 01:28:17,272 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1134 [2021-11-07 01:28:17,272 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:28:17,273 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:28:17,273 INFO L85 PathProgramCache]: Analyzing trace with hash -552753702, now seen corresponding path program 36 times [2021-11-07 01:28:17,273 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:28:17,273 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [666531192] [2021-11-07 01:28:17,273 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:28:17,273 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:28:17,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:28:18,465 INFO L134 CoverageAnalysis]: Checked inductivity of 1328 backedges. 325 proven. 1003 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:28:18,465 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:28:18,465 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [666531192] [2021-11-07 01:28:18,465 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [666531192] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:28:18,466 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [775178806] [2021-11-07 01:28:18,466 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-07 01:28:18,466 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:28:18,466 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:28:18,467 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:28:18,468 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2021-11-07 01:28:22,608 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-07 01:28:22,608 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:28:22,612 INFO L263 TraceCheckSpWp]: Trace formula consists of 428 conjuncts, 84 conjunts are in the unsatisfiable core [2021-11-07 01:28:22,615 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:28:24,396 INFO L134 CoverageAnalysis]: Checked inductivity of 1328 backedges. 0 proven. 1328 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:28:24,397 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:28:25,992 INFO L134 CoverageAnalysis]: Checked inductivity of 1328 backedges. 0 proven. 1328 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:28:25,993 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [775178806] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:28:25,993 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [685678592] [2021-11-07 01:28:25,994 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-07 01:28:25,994 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 01:28:25,994 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-07 01:28:25,994 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-07 01:28:25,994 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-07 01:28:25,996 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:28:25,996 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:28:25,997 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:28:25,997 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-07 01:28:25,997 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:28:25,998 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:28:25,998 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-07 01:28:25,999 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 97 [2021-11-07 01:28:26,000 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_45|], 10=[|v_#valid_46|]} [2021-11-07 01:28:26,005 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:28:26,006 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 [2021-11-07 01:28:26,006 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:28:26,006 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:28:26,007 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:28:26,007 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:28:26,007 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-07 01:28:26,007 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:28:26,009 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:28:26,011 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:28:26,012 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:28:26,013 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:28:26,016 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:28:26,017 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 [2021-11-07 01:28:26,017 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:28:26,019 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:28:26,019 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:28:26,019 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:28:26,020 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-07 01:28:26,020 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:28:26,021 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:28:26,022 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:28:26,022 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 79 [2021-11-07 01:28:26,023 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-07 01:28:26,023 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:94, output treesize:79 [2021-11-07 01:28:26,026 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.1 percent of original size [2021-11-07 01:28:26,028 INFO L185 QuantifierPusher]: treesize reduction 5, result has 94.4 percent of original size 85 [2021-11-07 01:28:26,033 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:28:26,037 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:28:26,050 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:28:26,065 INFO L180 QuantifierPusher]: treesize reduction 3, result has 98.7 percent of original size [2021-11-07 01:28:26,068 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 227 [2021-11-07 01:28:26,071 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:28:26,081 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:28:26,082 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:28:26,082 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:28:26,083 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:28:26,083 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:28:26,085 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:28:26,088 INFO L180 QuantifierPusher]: treesize reduction 24, result has 69.6 percent of original size [2021-11-07 01:28:26,089 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 46 [2021-11-07 01:28:26,090 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:28:26,093 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:28:26,096 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:28:26,101 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:28:26,103 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 101 [2021-11-07 01:28:26,104 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:28:26,109 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:28:26,110 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:28:26,110 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:28:26,111 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:28:26,112 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:28:26,114 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-07 01:28:26,116 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-07 01:28:26,120 INFO L180 QuantifierPusher]: treesize reduction 25, result has 81.5 percent of original size [2021-11-07 01:28:26,121 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-07 01:28:26,123 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:28:26,128 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:28:26,129 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:28:26,130 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:28:26,130 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:28:26,131 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:28:26,131 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:28:26,132 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:28:26,132 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:28:26,134 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:28:26,137 INFO L180 QuantifierPusher]: treesize reduction 24, result has 81.7 percent of original size [2021-11-07 01:28:26,139 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 102 [2021-11-07 01:28:26,144 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-07 01:28:27,157 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-07 01:28:27,157 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-07 01:28:27,157 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 56, 56] total 111 [2021-11-07 01:28:27,158 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1085992125] [2021-11-07 01:28:27,158 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 111 states [2021-11-07 01:28:27,158 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:28:27,159 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 111 interpolants. [2021-11-07 01:28:27,160 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2002, Invalid=11570, Unknown=0, NotChecked=0, Total=13572 [2021-11-07 01:28:27,160 INFO L87 Difference]: Start difference. First operand 133 states and 158 transitions. Second operand has 111 states, 111 states have (on average 1.4954954954954955) internal successors, (166), 111 states have internal predecessors, (166), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:28:30,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:28:30,137 INFO L93 Difference]: Finished difference Result 218 states and 244 transitions. [2021-11-07 01:28:30,138 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2021-11-07 01:28:30,138 INFO L78 Accepts]: Start accepts. Automaton has has 111 states, 111 states have (on average 1.4954954954954955) internal successors, (166), 111 states have internal predecessors, (166), 0 states have call successors, (0), 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 [2021-11-07 01:28:30,138 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:28:30,139 INFO L225 Difference]: With dead ends: 218 [2021-11-07 01:28:30,139 INFO L226 Difference]: Without dead ends: 216 [2021-11-07 01:28:30,141 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 432 GetRequests, 260 SyntacticMatches, 3 SemanticMatches, 169 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8394 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=4779, Invalid=24291, Unknown=0, NotChecked=0, Total=29070 [2021-11-07 01:28:30,142 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 216 states. [2021-11-07 01:28:30,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 216 to 112. [2021-11-07 01:28:30,314 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 111 states have (on average 1.018018018018018) internal successors, (113), 111 states have internal predecessors, (113), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:28:30,314 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 113 transitions. [2021-11-07 01:28:30,314 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 113 transitions. Word has length 108 [2021-11-07 01:28:30,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:28:30,315 INFO L470 AbstractCegarLoop]: Abstraction has 112 states and 113 transitions. [2021-11-07 01:28:30,315 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 111 states, 111 states have (on average 1.4954954954954955) internal successors, (166), 111 states have internal predecessors, (166), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:28:30,315 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 113 transitions. [2021-11-07 01:28:30,315 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2021-11-07 01:28:30,316 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:28:30,316 INFO L513 BasicCegarLoop]: trace histogram [27, 27, 26, 26, 1, 1, 1, 1, 1] [2021-11-07 01:28:30,355 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Forceful destruction successful, exit code 0 [2021-11-07 01:28:30,516 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1166 [2021-11-07 01:28:30,517 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:28:30,517 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:28:30,517 INFO L85 PathProgramCache]: Analyzing trace with hash -176098172, now seen corresponding path program 37 times [2021-11-07 01:28:30,517 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:28:30,518 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [787854079] [2021-11-07 01:28:30,518 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:28:30,518 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:28:30,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:28:33,450 INFO L134 CoverageAnalysis]: Checked inductivity of 1405 backedges. 925 proven. 480 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:28:33,450 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:28:33,450 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [787854079] [2021-11-07 01:28:33,450 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [787854079] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:28:33,450 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [777649813] [2021-11-07 01:28:33,450 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-07 01:28:33,450 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:28:33,450 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:28:33,451 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:28:33,456 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2021-11-07 01:28:37,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:28:37,865 INFO L263 TraceCheckSpWp]: Trace formula consists of 438 conjuncts, 113 conjunts are in the unsatisfiable core [2021-11-07 01:28:37,867 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:28:41,001 INFO L134 CoverageAnalysis]: Checked inductivity of 1405 backedges. 0 proven. 1405 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:28:41,001 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:28:48,555 INFO L134 CoverageAnalysis]: Checked inductivity of 1405 backedges. 0 proven. 1405 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:28:48,556 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [777649813] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:28:48,556 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1598644553] [2021-11-07 01:28:48,557 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-07 01:28:48,557 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 01:28:48,557 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-07 01:28:48,557 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-07 01:28:48,557 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-07 01:28:48,559 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:28:48,559 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:28:48,560 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:28:48,560 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-07 01:28:48,560 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:28:48,561 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:28:48,561 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-07 01:28:48,562 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 97 [2021-11-07 01:28:48,576 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_46|], 10=[|v_#valid_47|]} [2021-11-07 01:28:48,582 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:28:48,583 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 [2021-11-07 01:28:48,584 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:28:48,584 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:28:48,585 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:28:48,586 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:28:48,586 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-07 01:28:48,586 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:28:48,588 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:28:48,592 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:28:48,593 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:28:48,594 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:28:48,598 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:28:48,599 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 [2021-11-07 01:28:48,600 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:28:48,601 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:28:48,602 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:28:48,602 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:28:48,603 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-07 01:28:48,603 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:28:48,605 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:28:48,606 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:28:48,607 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 79 [2021-11-07 01:28:48,608 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-07 01:28:48,608 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:94, output treesize:79 [2021-11-07 01:28:48,612 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.1 percent of original size [2021-11-07 01:28:48,614 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-07 01:28:48,616 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:28:48,622 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:28:48,628 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:28:48,644 INFO L180 QuantifierPusher]: treesize reduction 3, result has 98.7 percent of original size [2021-11-07 01:28:48,649 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 229 [2021-11-07 01:28:48,653 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:28:48,665 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:28:48,666 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:28:48,667 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:28:48,667 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:28:48,668 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:28:48,671 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:28:48,673 INFO L180 QuantifierPusher]: treesize reduction 24, result has 69.6 percent of original size [2021-11-07 01:28:48,674 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 46 [2021-11-07 01:28:48,676 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:28:48,678 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:28:48,681 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:28:48,687 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:28:48,688 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 101 [2021-11-07 01:28:48,690 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:28:48,695 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:28:48,696 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:28:48,697 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:28:48,697 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:28:48,700 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:28:48,703 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-07 01:28:48,704 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-07 01:28:48,708 INFO L180 QuantifierPusher]: treesize reduction 25, result has 81.5 percent of original size [2021-11-07 01:28:48,710 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 107 [2021-11-07 01:28:48,712 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:28:48,717 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:28:48,717 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:28:48,718 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:28:48,718 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:28:48,719 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:28:48,719 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:28:48,720 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:28:48,720 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:28:48,722 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:28:48,725 INFO L180 QuantifierPusher]: treesize reduction 24, result has 81.7 percent of original size [2021-11-07 01:28:48,727 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 102 [2021-11-07 01:28:48,732 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-07 01:28:50,142 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-07 01:28:50,142 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-07 01:28:50,142 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 58, 58] total 143 [2021-11-07 01:28:50,142 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [7425678] [2021-11-07 01:28:50,143 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 143 states [2021-11-07 01:28:50,143 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:28:50,144 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 143 interpolants. [2021-11-07 01:28:50,145 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2937, Invalid=19115, Unknown=0, NotChecked=0, Total=22052 [2021-11-07 01:28:50,145 INFO L87 Difference]: Start difference. First operand 112 states and 113 transitions. Second operand has 143 states, 143 states have (on average 2.111888111888112) internal successors, (302), 143 states have internal predecessors, (302), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:29:14,027 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:29:14,027 INFO L93 Difference]: Finished difference Result 308 states and 339 transitions. [2021-11-07 01:29:14,028 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 144 states. [2021-11-07 01:29:14,028 INFO L78 Accepts]: Start accepts. Automaton has has 143 states, 143 states have (on average 2.111888111888112) internal successors, (302), 143 states have internal predecessors, (302), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 111 [2021-11-07 01:29:14,029 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:29:14,030 INFO L225 Difference]: With dead ends: 308 [2021-11-07 01:29:14,030 INFO L226 Difference]: Without dead ends: 222 [2021-11-07 01:29:14,034 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 502 GetRequests, 241 SyntacticMatches, 2 SemanticMatches, 259 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18165 ImplicationChecksByTransitivity, 30.0s TimeCoverageRelationStatistics Valid=8750, Invalid=59110, Unknown=0, NotChecked=0, Total=67860 [2021-11-07 01:29:14,034 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 222 states. [2021-11-07 01:29:14,408 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 222 to 143. [2021-11-07 01:29:14,408 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 142 states have (on average 1.204225352112676) internal successors, (171), 142 states have internal predecessors, (171), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:29:14,409 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 171 transitions. [2021-11-07 01:29:14,409 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 171 transitions. Word has length 111 [2021-11-07 01:29:14,409 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:29:14,410 INFO L470 AbstractCegarLoop]: Abstraction has 143 states and 171 transitions. [2021-11-07 01:29:14,410 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 143 states, 143 states have (on average 2.111888111888112) internal successors, (302), 143 states have internal predecessors, (302), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:29:14,410 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 171 transitions. [2021-11-07 01:29:14,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2021-11-07 01:29:14,411 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:29:14,411 INFO L513 BasicCegarLoop]: trace histogram [28, 28, 27, 27, 1, 1, 1, 1, 1] [2021-11-07 01:29:14,475 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Forceful destruction successful, exit code 0 [2021-11-07 01:29:14,627 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1198 [2021-11-07 01:29:14,628 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:29:14,628 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:29:14,628 INFO L85 PathProgramCache]: Analyzing trace with hash 1326386554, now seen corresponding path program 38 times [2021-11-07 01:29:14,628 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:29:14,628 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [882149899] [2021-11-07 01:29:14,628 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:29:14,628 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:29:14,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:29:17,918 INFO L134 CoverageAnalysis]: Checked inductivity of 1513 backedges. 1001 proven. 512 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:29:17,918 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:29:17,918 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [882149899] [2021-11-07 01:29:17,918 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [882149899] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:29:17,918 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1539925602] [2021-11-07 01:29:17,918 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-07 01:29:17,919 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:29:17,919 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:29:17,920 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:29:17,921 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2021-11-07 01:29:22,580 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 28 check-sat command(s) [2021-11-07 01:29:22,580 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:29:22,585 INFO L263 TraceCheckSpWp]: Trace formula consists of 453 conjuncts, 90 conjunts are in the unsatisfiable core [2021-11-07 01:29:22,587 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:29:28,117 INFO L134 CoverageAnalysis]: Checked inductivity of 1513 backedges. 0 proven. 1513 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:29:28,117 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:29:36,750 INFO L134 CoverageAnalysis]: Checked inductivity of 1513 backedges. 0 proven. 1513 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:29:36,750 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1539925602] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:29:36,750 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [321763823] [2021-11-07 01:29:36,751 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-07 01:29:36,751 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 01:29:36,752 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-07 01:29:36,752 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-07 01:29:36,752 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-07 01:29:36,754 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:29:36,754 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:29:36,755 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:29:36,755 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-07 01:29:36,755 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:29:36,755 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:29:36,756 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-07 01:29:36,756 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 97 [2021-11-07 01:29:36,758 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_47|], 10=[|v_#valid_48|]} [2021-11-07 01:29:36,762 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:29:36,762 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 [2021-11-07 01:29:36,763 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:29:36,763 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:29:36,763 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:29:36,764 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:29:36,764 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-07 01:29:36,764 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:29:36,765 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:29:36,768 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:29:36,771 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:29:36,772 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:29:36,774 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:29:36,775 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 [2021-11-07 01:29:36,776 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:29:36,777 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:29:36,777 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:29:36,778 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:29:36,778 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-07 01:29:36,779 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:29:36,780 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:29:36,780 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:29:36,781 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 79 [2021-11-07 01:29:36,781 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-07 01:29:36,781 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:94, output treesize:79 [2021-11-07 01:29:36,784 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.1 percent of original size [2021-11-07 01:29:36,785 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-07 01:29:36,786 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:29:36,790 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:29:36,794 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:29:36,803 INFO L180 QuantifierPusher]: treesize reduction 3, result has 98.7 percent of original size [2021-11-07 01:29:36,805 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 229 [2021-11-07 01:29:36,808 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:29:36,819 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:29:36,820 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:29:36,820 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:29:36,821 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:29:36,821 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:29:36,823 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:29:36,825 INFO L180 QuantifierPusher]: treesize reduction 24, result has 69.6 percent of original size [2021-11-07 01:29:36,826 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 46 [2021-11-07 01:29:36,828 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:29:36,830 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:29:36,833 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:29:36,838 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:29:36,840 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 101 [2021-11-07 01:29:36,842 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:29:36,847 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:29:36,847 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:29:36,848 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:29:36,848 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:29:36,849 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:29:36,851 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-07 01:29:36,853 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-07 01:29:36,856 INFO L180 QuantifierPusher]: treesize reduction 25, result has 81.5 percent of original size [2021-11-07 01:29:36,858 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-07 01:29:36,860 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:29:36,865 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:29:36,866 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:29:36,866 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:29:36,867 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:29:36,867 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:29:36,868 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:29:36,868 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:29:36,869 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:29:36,871 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:29:36,874 INFO L180 QuantifierPusher]: treesize reduction 24, result has 81.7 percent of original size [2021-11-07 01:29:36,876 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 102 [2021-11-07 01:29:36,881 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-07 01:29:38,404 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-07 01:29:38,404 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-07 01:29:38,404 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 60, 60] total 176 [2021-11-07 01:29:38,404 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1442971032] [2021-11-07 01:29:38,405 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 176 states [2021-11-07 01:29:38,406 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:29:38,407 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 176 interpolants. [2021-11-07 01:29:38,409 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3606, Invalid=29336, Unknown=0, NotChecked=0, Total=32942 [2021-11-07 01:29:38,410 INFO L87 Difference]: Start difference. First operand 143 states and 171 transitions. Second operand has 176 states, 176 states have (on average 1.9318181818181819) internal successors, (340), 176 states have internal predecessors, (340), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:29:58,293 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:29:58,293 INFO L93 Difference]: Finished difference Result 235 states and 264 transitions. [2021-11-07 01:29:58,294 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2021-11-07 01:29:58,294 INFO L78 Accepts]: Start accepts. Automaton has has 176 states, 176 states have (on average 1.9318181818181819) internal successors, (340), 176 states have internal predecessors, (340), 0 states have call successors, (0), 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 115 [2021-11-07 01:29:58,294 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:29:58,295 INFO L225 Difference]: With dead ends: 235 [2021-11-07 01:29:58,296 INFO L226 Difference]: Without dead ends: 146 [2021-11-07 01:29:58,300 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 463 GetRequests, 223 SyntacticMatches, 1 SemanticMatches, 239 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15334 ImplicationChecksByTransitivity, 32.4s TimeCoverageRelationStatistics Valid=6322, Invalid=51518, Unknown=0, NotChecked=0, Total=57840 [2021-11-07 01:29:58,301 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2021-11-07 01:29:58,566 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 143. [2021-11-07 01:29:58,567 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 142 states have (on average 1.1971830985915493) internal successors, (170), 142 states have internal predecessors, (170), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:29:58,567 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 170 transitions. [2021-11-07 01:29:58,567 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 170 transitions. Word has length 115 [2021-11-07 01:29:58,567 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:29:58,568 INFO L470 AbstractCegarLoop]: Abstraction has 143 states and 170 transitions. [2021-11-07 01:29:58,568 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 176 states, 176 states have (on average 1.9318181818181819) internal successors, (340), 176 states have internal predecessors, (340), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:29:58,568 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 170 transitions. [2021-11-07 01:29:58,568 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2021-11-07 01:29:58,568 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:29:58,569 INFO L513 BasicCegarLoop]: trace histogram [29, 28, 27, 27, 1, 1, 1, 1, 1] [2021-11-07 01:29:58,606 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Forceful destruction successful, exit code 0 [2021-11-07 01:29:58,769 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1230,42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:29:58,769 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:29:58,770 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:29:58,770 INFO L85 PathProgramCache]: Analyzing trace with hash 768354714, now seen corresponding path program 39 times [2021-11-07 01:29:58,770 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:29:58,770 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2027274119] [2021-11-07 01:29:58,770 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:29:58,770 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:29:58,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:30:00,228 INFO L134 CoverageAnalysis]: Checked inductivity of 1542 backedges. 378 proven. 1164 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:30:00,228 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:30:00,228 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2027274119] [2021-11-07 01:30:00,229 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2027274119] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:30:00,229 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [381762788] [2021-11-07 01:30:00,229 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-07 01:30:00,229 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:30:00,229 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:30:00,230 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:30:00,231 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2021-11-07 01:30:05,436 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-07 01:30:05,436 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:30:05,440 INFO L263 TraceCheckSpWp]: Trace formula consists of 458 conjuncts, 90 conjunts are in the unsatisfiable core [2021-11-07 01:30:05,442 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:30:07,523 INFO L134 CoverageAnalysis]: Checked inductivity of 1542 backedges. 0 proven. 1542 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:30:07,523 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:30:09,449 INFO L134 CoverageAnalysis]: Checked inductivity of 1542 backedges. 0 proven. 1542 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:30:09,449 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [381762788] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:30:09,449 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1216153323] [2021-11-07 01:30:09,450 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-07 01:30:09,450 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 01:30:09,450 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-07 01:30:09,451 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-07 01:30:09,451 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-07 01:30:09,453 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:30:09,453 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:30:09,454 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:30:09,454 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-07 01:30:09,454 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:30:09,455 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:30:09,455 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-07 01:30:09,456 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 97 [2021-11-07 01:30:09,457 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_48|], 10=[|v_#valid_49|]} [2021-11-07 01:30:09,462 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:30:09,463 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 [2021-11-07 01:30:09,463 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:30:09,463 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:30:09,464 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:30:09,464 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:30:09,464 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-07 01:30:09,464 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:30:09,466 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:30:09,468 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:30:09,469 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:30:09,470 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:30:09,473 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:30:09,477 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 [2021-11-07 01:30:09,478 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:30:09,479 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:30:09,479 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:30:09,480 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:30:09,480 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-07 01:30:09,480 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:30:09,482 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:30:09,482 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:30:09,483 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 79 [2021-11-07 01:30:09,483 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-07 01:30:09,483 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:94, output treesize:79 [2021-11-07 01:30:09,486 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.1 percent of original size [2021-11-07 01:30:09,487 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-07 01:30:09,489 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:30:09,493 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:30:09,497 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:30:09,507 INFO L180 QuantifierPusher]: treesize reduction 3, result has 98.7 percent of original size [2021-11-07 01:30:09,510 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 229 [2021-11-07 01:30:09,513 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:30:09,554 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:30:09,555 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:30:09,555 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:30:09,556 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:30:09,556 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:30:09,560 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:30:09,562 INFO L180 QuantifierPusher]: treesize reduction 24, result has 69.6 percent of original size [2021-11-07 01:30:09,563 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 46 [2021-11-07 01:30:09,565 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:30:09,568 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:30:09,573 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:30:09,578 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:30:09,580 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 101 [2021-11-07 01:30:09,582 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:30:09,587 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:30:09,594 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:30:09,595 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:30:09,596 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:30:09,597 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:30:09,599 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-07 01:30:09,600 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-07 01:30:09,604 INFO L180 QuantifierPusher]: treesize reduction 25, result has 81.5 percent of original size [2021-11-07 01:30:09,606 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 107 [2021-11-07 01:30:09,608 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:30:09,613 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:30:09,614 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:30:09,614 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:30:09,615 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:30:09,615 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:30:09,616 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:30:09,617 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:30:09,617 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:30:09,619 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:30:09,622 INFO L180 QuantifierPusher]: treesize reduction 24, result has 81.7 percent of original size [2021-11-07 01:30:09,624 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 102 [2021-11-07 01:30:09,629 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-07 01:30:10,714 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-07 01:30:10,714 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-07 01:30:10,715 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 60, 60] total 119 [2021-11-07 01:30:10,715 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [949775477] [2021-11-07 01:30:10,715 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 119 states [2021-11-07 01:30:10,716 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:30:10,716 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 119 interpolants. [2021-11-07 01:30:10,717 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2293, Invalid=13207, Unknown=0, NotChecked=0, Total=15500 [2021-11-07 01:30:10,717 INFO L87 Difference]: Start difference. First operand 143 states and 170 transitions. Second operand has 119 states, 119 states have (on average 1.495798319327731) internal successors, (178), 119 states have internal predecessors, (178), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:30:14,149 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:30:14,150 INFO L93 Difference]: Finished difference Result 234 states and 262 transitions. [2021-11-07 01:30:14,150 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2021-11-07 01:30:14,150 INFO L78 Accepts]: Start accepts. Automaton has has 119 states, 119 states have (on average 1.495798319327731) internal successors, (178), 119 states have internal predecessors, (178), 0 states have call successors, (0), 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 [2021-11-07 01:30:14,150 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:30:14,152 INFO L225 Difference]: With dead ends: 234 [2021-11-07 01:30:14,152 INFO L226 Difference]: Without dead ends: 232 [2021-11-07 01:30:14,153 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 464 GetRequests, 280 SyntacticMatches, 3 SemanticMatches, 181 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9627 ImplicationChecksByTransitivity, 7.4s TimeCoverageRelationStatistics Valid=5479, Invalid=27827, Unknown=0, NotChecked=0, Total=33306 [2021-11-07 01:30:14,154 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 232 states. [2021-11-07 01:30:14,337 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 232 to 120. [2021-11-07 01:30:14,338 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 120 states, 119 states have (on average 1.0168067226890756) internal successors, (121), 119 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) [2021-11-07 01:30:14,338 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 121 transitions. [2021-11-07 01:30:14,338 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 121 transitions. Word has length 116 [2021-11-07 01:30:14,339 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:30:14,339 INFO L470 AbstractCegarLoop]: Abstraction has 120 states and 121 transitions. [2021-11-07 01:30:14,339 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 119 states, 119 states have (on average 1.495798319327731) internal successors, (178), 119 states have internal predecessors, (178), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:30:14,339 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 121 transitions. [2021-11-07 01:30:14,340 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2021-11-07 01:30:14,340 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:30:14,340 INFO L513 BasicCegarLoop]: trace histogram [29, 29, 28, 28, 1, 1, 1, 1, 1] [2021-11-07 01:30:14,384 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Forceful destruction successful, exit code 0 [2021-11-07 01:30:14,542 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1262,43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:30:14,542 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:30:14,542 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:30:14,542 INFO L85 PathProgramCache]: Analyzing trace with hash -2115577660, now seen corresponding path program 40 times [2021-11-07 01:30:14,542 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:30:14,542 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [787940245] [2021-11-07 01:30:14,543 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:30:14,543 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:30:14,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:30:18,086 INFO L134 CoverageAnalysis]: Checked inductivity of 1625 backedges. 1080 proven. 545 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:30:18,086 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:30:18,086 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [787940245] [2021-11-07 01:30:18,086 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [787940245] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:30:18,086 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1763973759] [2021-11-07 01:30:18,086 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-07 01:30:18,086 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:30:18,087 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:30:18,087 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:30:18,088 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2021-11-07 01:30:23,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:30:23,459 INFO L263 TraceCheckSpWp]: Trace formula consists of 468 conjuncts, 121 conjunts are in the unsatisfiable core [2021-11-07 01:30:23,463 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:30:27,216 INFO L134 CoverageAnalysis]: Checked inductivity of 1625 backedges. 0 proven. 1625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:30:27,216 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:30:36,041 INFO L134 CoverageAnalysis]: Checked inductivity of 1625 backedges. 0 proven. 1625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:30:36,041 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1763973759] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:30:36,041 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1691749936] [2021-11-07 01:30:36,042 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-07 01:30:36,042 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 01:30:36,043 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-07 01:30:36,043 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-07 01:30:36,043 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-07 01:30:36,045 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:30:36,045 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:30:36,046 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:30:36,046 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-07 01:30:36,046 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:30:36,046 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:30:36,047 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-07 01:30:36,048 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 97 [2021-11-07 01:30:36,049 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_49|], 10=[|v_#valid_50|]} [2021-11-07 01:30:36,054 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:30:36,054 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 [2021-11-07 01:30:36,055 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:30:36,055 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:30:36,056 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:30:36,056 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:30:36,056 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-07 01:30:36,056 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:30:36,058 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:30:36,060 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:30:36,061 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:30:36,062 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:30:36,065 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:30:36,066 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 [2021-11-07 01:30:36,066 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:30:36,068 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:30:36,068 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:30:36,069 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:30:36,069 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-07 01:30:36,069 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:30:36,070 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:30:36,071 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:30:36,072 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 79 [2021-11-07 01:30:36,072 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-07 01:30:36,072 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:94, output treesize:79 [2021-11-07 01:30:36,075 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.1 percent of original size [2021-11-07 01:30:36,076 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-07 01:30:36,078 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:30:36,082 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:30:36,086 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:30:36,096 INFO L180 QuantifierPusher]: treesize reduction 3, result has 98.7 percent of original size [2021-11-07 01:30:36,099 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 229 [2021-11-07 01:30:36,102 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:30:36,114 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:30:36,115 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:30:36,115 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:30:36,116 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:30:36,116 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:30:36,118 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:30:36,120 INFO L180 QuantifierPusher]: treesize reduction 24, result has 69.6 percent of original size [2021-11-07 01:30:36,121 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 46 [2021-11-07 01:30:36,123 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:30:36,126 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:30:36,129 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:30:36,134 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:30:36,136 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 101 [2021-11-07 01:30:36,138 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:30:36,143 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:30:36,143 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:30:36,144 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:30:36,145 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:30:36,146 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:30:36,148 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-07 01:30:36,149 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-07 01:30:36,153 INFO L180 QuantifierPusher]: treesize reduction 25, result has 81.5 percent of original size [2021-11-07 01:30:36,155 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 107 [2021-11-07 01:30:36,157 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:30:36,162 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:30:36,163 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:30:36,163 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:30:36,164 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:30:36,164 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:30:36,165 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:30:36,165 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:30:36,166 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:30:36,167 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:30:36,171 INFO L180 QuantifierPusher]: treesize reduction 24, result has 81.7 percent of original size [2021-11-07 01:30:36,173 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 102 [2021-11-07 01:30:36,178 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-07 01:30:37,714 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-07 01:30:37,714 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-07 01:30:37,714 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 62, 62] total 153 [2021-11-07 01:30:37,714 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1377591063] [2021-11-07 01:30:37,715 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 153 states [2021-11-07 01:30:37,715 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:30:37,716 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 153 interpolants. [2021-11-07 01:30:37,717 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3354, Invalid=21768, Unknown=0, NotChecked=0, Total=25122 [2021-11-07 01:30:37,718 INFO L87 Difference]: Start difference. First operand 120 states and 121 transitions. Second operand has 153 states, 153 states have (on average 2.1176470588235294) internal successors, (324), 153 states have internal predecessors, (324), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:31:06,190 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:31:06,191 INFO L93 Difference]: Finished difference Result 330 states and 363 transitions. [2021-11-07 01:31:06,191 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 154 states. [2021-11-07 01:31:06,191 INFO L78 Accepts]: Start accepts. Automaton has has 153 states, 153 states have (on average 2.1176470588235294) internal successors, (324), 153 states have internal predecessors, (324), 0 states have call successors, (0), 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 119 [2021-11-07 01:31:06,192 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:31:06,193 INFO L225 Difference]: With dead ends: 330 [2021-11-07 01:31:06,193 INFO L226 Difference]: Without dead ends: 238 [2021-11-07 01:31:06,197 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 538 GetRequests, 259 SyntacticMatches, 2 SemanticMatches, 277 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20785 ImplicationChecksByTransitivity, 35.8s TimeCoverageRelationStatistics Valid=10001, Invalid=67561, Unknown=0, NotChecked=0, Total=77562 [2021-11-07 01:31:06,197 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 238 states. [2021-11-07 01:31:06,439 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 238 to 153. [2021-11-07 01:31:06,439 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 153 states, 152 states have (on average 1.2039473684210527) internal successors, (183), 152 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) [2021-11-07 01:31:06,440 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 183 transitions. [2021-11-07 01:31:06,440 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 183 transitions. Word has length 119 [2021-11-07 01:31:06,440 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:31:06,440 INFO L470 AbstractCegarLoop]: Abstraction has 153 states and 183 transitions. [2021-11-07 01:31:06,440 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 153 states, 153 states have (on average 2.1176470588235294) internal successors, (324), 153 states have internal predecessors, (324), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:31:06,440 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 183 transitions. [2021-11-07 01:31:06,441 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2021-11-07 01:31:06,441 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:31:06,441 INFO L513 BasicCegarLoop]: trace histogram [30, 30, 29, 29, 1, 1, 1, 1, 1] [2021-11-07 01:31:06,480 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Forceful destruction successful, exit code 0 [2021-11-07 01:31:06,641 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1294,44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:31:06,642 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:31:06,642 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:31:06,642 INFO L85 PathProgramCache]: Analyzing trace with hash -287448774, now seen corresponding path program 41 times [2021-11-07 01:31:06,643 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:31:06,643 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1398449621] [2021-11-07 01:31:06,643 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:31:06,643 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:31:06,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:31:10,429 INFO L134 CoverageAnalysis]: Checked inductivity of 1741 backedges. 1162 proven. 579 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:31:10,429 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:31:10,429 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1398449621] [2021-11-07 01:31:10,429 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1398449621] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:31:10,429 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1536883173] [2021-11-07 01:31:10,429 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-07 01:31:10,429 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:31:10,430 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:31:10,430 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:31:10,431 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_761bf1e9-3556-4a4e-804c-fc7d9e4e36f1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2021-11-07 01:31:16,109 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2021-11-07 01:31:16,109 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:31:16,113 INFO L263 TraceCheckSpWp]: Trace formula consists of 483 conjuncts, 96 conjunts are in the unsatisfiable core [2021-11-07 01:31:16,116 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:31:22,522 INFO L134 CoverageAnalysis]: Checked inductivity of 1741 backedges. 0 proven. 1741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:31:22,522 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:31:31,060 INFO L134 CoverageAnalysis]: Checked inductivity of 1741 backedges. 0 proven. 1741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:31:31,060 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1536883173] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:31:31,060 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1446332202] [2021-11-07 01:31:31,061 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-07 01:31:31,061 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 01:31:31,061 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-07 01:31:31,062 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-07 01:31:31,062 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-07 01:31:31,063 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:31:31,064 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:31:31,064 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:31:31,064 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-07 01:31:31,065 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:31:31,065 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:31:31,065 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-07 01:31:31,066 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 97 [2021-11-07 01:31:31,067 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_50|], 10=[|v_#valid_51|]} [2021-11-07 01:31:31,074 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:31:31,074 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 [2021-11-07 01:31:31,075 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:31:31,075 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:31:31,075 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:31:31,075 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-07 01:31:31,076 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-07 01:31:31,076 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:31:31,077 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:31:31,080 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:31:31,081 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:31:31,082 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:31:31,085 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:31:31,091 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 [2021-11-07 01:31:31,092 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:31:31,093 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:31:31,093 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:31:31,094 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:31:31,094 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-07 01:31:31,095 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:31:31,097 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:31:31,097 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:31:31,098 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 79 [2021-11-07 01:31:31,098 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-07 01:31:31,098 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:94, output treesize:79 [2021-11-07 01:31:31,101 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.1 percent of original size [2021-11-07 01:31:31,102 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-07 01:31:31,104 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:31:31,108 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:31:31,112 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:31:31,121 INFO L180 QuantifierPusher]: treesize reduction 3, result has 98.7 percent of original size [2021-11-07 01:31:31,124 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 229 [2021-11-07 01:31:31,127 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:31:31,138 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:31:31,138 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:31:31,139 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:31:31,139 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:31:31,140 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:31:31,141 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:31:31,143 INFO L180 QuantifierPusher]: treesize reduction 24, result has 69.6 percent of original size [2021-11-07 01:31:31,144 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 46 [2021-11-07 01:31:31,146 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:31:31,148 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:31:31,151 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:31:31,155 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:31:31,157 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 101 [2021-11-07 01:31:31,159 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:31:31,163 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:31:31,164 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:31:31,164 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:31:31,165 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:31:31,166 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:31:31,168 INFO L180 QuantifierPusher]: treesize reduction 24, result has 67.6 percent of original size [2021-11-07 01:31:31,169 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 41 [2021-11-07 01:31:31,172 INFO L180 QuantifierPusher]: treesize reduction 25, result has 81.5 percent of original size [2021-11-07 01:31:31,174 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-07 01:31:31,176 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:31:31,180 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:31:31,181 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:31:31,182 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:31:31,182 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:31:31,183 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:31:31,183 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:31:31,184 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:31:31,184 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:31:31,186 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:31:31,188 INFO L180 QuantifierPusher]: treesize reduction 24, result has 81.7 percent of original size [2021-11-07 01:31:31,190 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 102 [2021-11-07 01:31:31,197 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-07 01:31:32,551 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-07 01:31:32,551 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-07 01:31:32,551 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 64, 64] total 188 [2021-11-07 01:31:32,551 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [285182377] [2021-11-07 01:31:32,551 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 188 states [2021-11-07 01:31:32,552 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:31:32,552 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 188 interpolants. [2021-11-07 01:31:32,554 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4100, Invalid=33342, Unknown=0, NotChecked=0, Total=37442 [2021-11-07 01:31:32,554 INFO L87 Difference]: Start difference. First operand 153 states and 183 transitions. Second operand has 188 states, 188 states have (on average 1.9361702127659575) internal successors, (364), 188 states have internal predecessors, (364), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)