./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/hard2_unwindbound20.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version aef121e0 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ca5037d-439c-4945-80c6-92b5fb929c8f/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ca5037d-439c-4945-80c6-92b5fb929c8f/bin/utaipan-EQgc7hIp5V/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ca5037d-439c-4945-80c6-92b5fb929c8f/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ca5037d-439c-4945-80c6-92b5fb929c8f/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/hard2_unwindbound20.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ca5037d-439c-4945-80c6-92b5fb929c8f/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ca5037d-439c-4945-80c6-92b5fb929c8f/bin/utaipan-EQgc7hIp5V --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 b0dc7e6cdf006545b97e616af165994b39a2e54c024b52d6607380c5e84ee914 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 02:16:31,175 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 02:16:31,177 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 02:16:31,223 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 02:16:31,224 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 02:16:31,226 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 02:16:31,228 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 02:16:31,230 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 02:16:31,232 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 02:16:31,233 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 02:16:31,235 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 02:16:31,237 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 02:16:31,237 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 02:16:31,239 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 02:16:31,240 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 02:16:31,242 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 02:16:31,244 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 02:16:31,245 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 02:16:31,247 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 02:16:31,250 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 02:16:31,253 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 02:16:31,254 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 02:16:31,256 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 02:16:31,257 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 02:16:31,261 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 02:16:31,262 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 02:16:31,262 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 02:16:31,263 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 02:16:31,264 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 02:16:31,265 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 02:16:31,266 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 02:16:31,267 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 02:16:31,268 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 02:16:31,269 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 02:16:31,271 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 02:16:31,271 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 02:16:31,272 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 02:16:31,273 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 02:16:31,273 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 02:16:31,275 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 02:16:31,276 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 02:16:31,277 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ca5037d-439c-4945-80c6-92b5fb929c8f/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 02:16:31,302 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 02:16:31,303 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 02:16:31,303 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 02:16:31,304 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 02:16:31,305 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 02:16:31,305 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 02:16:31,305 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 02:16:31,306 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 02:16:31,306 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 02:16:31,306 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 02:16:31,307 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 02:16:31,307 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 02:16:31,307 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 02:16:31,308 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 02:16:31,308 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 02:16:31,309 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 02:16:31,309 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 02:16:31,309 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 02:16:31,310 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 02:16:31,310 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 02:16:31,311 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 02:16:31,311 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 02:16:31,311 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 02:16:31,312 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 02:16:31,312 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 02:16:31,312 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 02:16:31,313 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 02:16:31,313 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 02:16:31,313 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 02:16:31,314 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 02:16:31,314 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 02:16:31,314 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 02:16:31,315 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:16:31,315 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 02:16:31,315 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 02:16:31,316 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 02:16:31,316 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 02:16:31,316 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 02:16:31,317 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 02:16:31,317 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 02:16:31,317 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 02:16:31,317 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_5ca5037d-439c-4945-80c6-92b5fb929c8f/bin/utaipan-EQgc7hIp5V/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ca5037d-439c-4945-80c6-92b5fb929c8f/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> b0dc7e6cdf006545b97e616af165994b39a2e54c024b52d6607380c5e84ee914 [2021-11-23 02:16:31,586 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 02:16:31,613 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 02:16:31,616 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 02:16:31,617 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 02:16:31,618 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 02:16:31,619 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ca5037d-439c-4945-80c6-92b5fb929c8f/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/nla-digbench-scaling/hard2_unwindbound20.c [2021-11-23 02:16:31,711 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ca5037d-439c-4945-80c6-92b5fb929c8f/bin/utaipan-EQgc7hIp5V/data/7e3996508/2f118d1f9e2b44ee8cd0af815c07be14/FLAG11e815196 [2021-11-23 02:16:32,219 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 02:16:32,221 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ca5037d-439c-4945-80c6-92b5fb929c8f/sv-benchmarks/c/nla-digbench-scaling/hard2_unwindbound20.c [2021-11-23 02:16:32,233 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ca5037d-439c-4945-80c6-92b5fb929c8f/bin/utaipan-EQgc7hIp5V/data/7e3996508/2f118d1f9e2b44ee8cd0af815c07be14/FLAG11e815196 [2021-11-23 02:16:32,580 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ca5037d-439c-4945-80c6-92b5fb929c8f/bin/utaipan-EQgc7hIp5V/data/7e3996508/2f118d1f9e2b44ee8cd0af815c07be14 [2021-11-23 02:16:32,587 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 02:16:32,588 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 02:16:32,590 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 02:16:32,590 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 02:16:32,594 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 02:16:32,595 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:16:32" (1/1) ... [2021-11-23 02:16:32,596 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@62510a4f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:16:32, skipping insertion in model container [2021-11-23 02:16:32,596 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:16:32" (1/1) ... [2021-11-23 02:16:32,604 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 02:16:32,619 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 02:16:32,805 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ca5037d-439c-4945-80c6-92b5fb929c8f/sv-benchmarks/c/nla-digbench-scaling/hard2_unwindbound20.c[526,539] [2021-11-23 02:16:32,830 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:16:32,843 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 02:16:32,853 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ca5037d-439c-4945-80c6-92b5fb929c8f/sv-benchmarks/c/nla-digbench-scaling/hard2_unwindbound20.c[526,539] [2021-11-23 02:16:32,860 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:16:32,873 INFO L208 MainTranslator]: Completed translation [2021-11-23 02:16:32,873 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:16:32 WrapperNode [2021-11-23 02:16:32,874 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 02:16:32,875 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 02:16:32,875 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 02:16:32,875 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 02:16:32,885 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:16:32" (1/1) ... [2021-11-23 02:16:32,893 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:16:32" (1/1) ... [2021-11-23 02:16:32,913 INFO L137 Inliner]: procedures = 14, calls = 14, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 61 [2021-11-23 02:16:32,914 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 02:16:32,915 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 02:16:32,915 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 02:16:32,915 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 02:16:32,922 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:16:32" (1/1) ... [2021-11-23 02:16:32,922 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:16:32" (1/1) ... [2021-11-23 02:16:32,924 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:16:32" (1/1) ... [2021-11-23 02:16:32,924 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:16:32" (1/1) ... [2021-11-23 02:16:32,928 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:16:32" (1/1) ... [2021-11-23 02:16:32,932 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:16:32" (1/1) ... [2021-11-23 02:16:32,933 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:16:32" (1/1) ... [2021-11-23 02:16:32,935 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 02:16:32,936 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 02:16:32,936 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 02:16:32,936 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 02:16:32,937 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:16:32" (1/1) ... [2021-11-23 02:16:32,945 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:16:32,959 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ca5037d-439c-4945-80c6-92b5fb929c8f/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:16:32,969 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ca5037d-439c-4945-80c6-92b5fb929c8f/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 02:16:32,993 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ca5037d-439c-4945-80c6-92b5fb929c8f/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 02:16:33,012 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 02:16:33,012 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 02:16:33,013 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 02:16:33,013 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 02:16:33,013 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-11-23 02:16:33,013 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-11-23 02:16:33,074 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 02:16:33,075 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 02:16:33,227 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 02:16:33,256 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 02:16:33,256 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-23 02:16:33,258 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:16:33 BoogieIcfgContainer [2021-11-23 02:16:33,259 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 02:16:33,276 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 02:16:33,277 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 02:16:33,283 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 02:16:33,284 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 02:16:32" (1/3) ... [2021-11-23 02:16:33,284 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@30a6d360 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:16:33, skipping insertion in model container [2021-11-23 02:16:33,285 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:16:32" (2/3) ... [2021-11-23 02:16:33,285 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@30a6d360 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:16:33, skipping insertion in model container [2021-11-23 02:16:33,285 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:16:33" (3/3) ... [2021-11-23 02:16:33,286 INFO L111 eAbstractionObserver]: Analyzing ICFG hard2_unwindbound20.c [2021-11-23 02:16:33,292 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 02:16:33,292 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 02:16:33,357 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 02:16:33,364 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 [2021-11-23 02:16:33,365 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 02:16:33,386 INFO L276 IsEmpty]: Start isEmpty. Operand has 22 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 13 states have internal predecessors, (20), 7 states have call successors, (7), 1 states have call predecessors, (7), 1 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-23 02:16:33,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-23 02:16:33,391 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:16:33,391 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:16:33,392 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:16:33,396 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:16:33,397 INFO L85 PathProgramCache]: Analyzing trace with hash 1291730102, now seen corresponding path program 1 times [2021-11-23 02:16:33,406 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:16:33,407 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [275283870] [2021-11-23 02:16:33,407 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:16:33,408 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:16:33,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:16:33,521 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:16:33,522 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:16:33,523 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [275283870] [2021-11-23 02:16:33,523 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [275283870] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:16:33,524 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:16:33,524 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 02:16:33,526 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1724575886] [2021-11-23 02:16:33,527 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:16:33,531 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-23 02:16:33,531 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:16:33,559 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-23 02:16:33,559 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-23 02:16:33,562 INFO L87 Difference]: Start difference. First operand has 22 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 13 states have internal predecessors, (20), 7 states have call successors, (7), 1 states have call predecessors, (7), 1 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) Second operand has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:16:33,596 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:16:33,596 INFO L93 Difference]: Finished difference Result 43 states and 74 transitions. [2021-11-23 02:16:33,598 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-23 02:16:33,599 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2021-11-23 02:16:33,599 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:16:33,607 INFO L225 Difference]: With dead ends: 43 [2021-11-23 02:16:33,607 INFO L226 Difference]: Without dead ends: 20 [2021-11-23 02:16:33,611 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-23 02:16:33,615 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 3 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:16:33,617 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 28 Invalid, 3 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:16:33,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-11-23 02:16:33,653 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2021-11-23 02:16:33,654 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 7 states have call successors, (7), 1 states have call predecessors, (7), 1 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-23 02:16:33,656 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 29 transitions. [2021-11-23 02:16:33,657 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 29 transitions. Word has length 7 [2021-11-23 02:16:33,658 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:16:33,658 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 29 transitions. [2021-11-23 02:16:33,658 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:16:33,658 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 29 transitions. [2021-11-23 02:16:33,659 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-23 02:16:33,659 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:16:33,659 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:16:33,660 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-23 02:16:33,660 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:16:33,661 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:16:33,661 INFO L85 PathProgramCache]: Analyzing trace with hash 829671692, now seen corresponding path program 1 times [2021-11-23 02:16:33,662 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:16:33,662 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1127417806] [2021-11-23 02:16:33,662 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:16:33,662 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:16:33,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:16:33,760 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:16:33,761 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:16:33,764 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1127417806] [2021-11-23 02:16:33,765 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1127417806] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:16:33,765 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:16:33,765 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:16:33,765 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1006481260] [2021-11-23 02:16:33,766 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:16:33,767 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:16:33,767 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:16:33,769 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:16:33,770 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:16:33,770 INFO L87 Difference]: Start difference. First operand 20 states and 29 transitions. Second operand has 5 states, 5 states have (on average 1.2) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:16:33,856 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:16:33,856 INFO L93 Difference]: Finished difference Result 33 states and 46 transitions. [2021-11-23 02:16:33,856 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:16:33,857 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.2) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2021-11-23 02:16:33,857 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:16:33,858 INFO L225 Difference]: With dead ends: 33 [2021-11-23 02:16:33,858 INFO L226 Difference]: Without dead ends: 31 [2021-11-23 02:16:33,859 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:16:33,861 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 13 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 90 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:16:33,861 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 90 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:16:33,863 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-11-23 02:16:33,870 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 24. [2021-11-23 02:16:33,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 15 states have internal predecessors, (19), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-23 02:16:33,872 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 32 transitions. [2021-11-23 02:16:33,872 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 32 transitions. Word has length 7 [2021-11-23 02:16:33,872 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:16:33,873 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 32 transitions. [2021-11-23 02:16:33,873 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.2) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:16:33,873 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 32 transitions. [2021-11-23 02:16:33,874 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-23 02:16:33,874 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:16:33,874 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:16:33,874 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-23 02:16:33,874 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:16:33,875 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:16:33,875 INFO L85 PathProgramCache]: Analyzing trace with hash -166824855, now seen corresponding path program 1 times [2021-11-23 02:16:33,876 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:16:33,876 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [370732539] [2021-11-23 02:16:33,876 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:16:33,876 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:16:33,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:16:33,926 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:16:33,927 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:16:33,927 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [370732539] [2021-11-23 02:16:33,927 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [370732539] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:16:33,928 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:16:33,928 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:16:33,928 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1677983461] [2021-11-23 02:16:33,928 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:16:33,929 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:16:33,929 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:16:33,929 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:16:33,930 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:16:33,930 INFO L87 Difference]: Start difference. First operand 24 states and 32 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:16:33,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:16:33,967 INFO L93 Difference]: Finished difference Result 39 states and 52 transitions. [2021-11-23 02:16:33,967 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:16:33,967 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2021-11-23 02:16:33,968 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:16:33,969 INFO L225 Difference]: With dead ends: 39 [2021-11-23 02:16:33,969 INFO L226 Difference]: Without dead ends: 26 [2021-11-23 02:16:33,969 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:16:33,971 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 0 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:16:33,972 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 73 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:16:33,973 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-11-23 02:16:33,979 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2021-11-23 02:16:33,979 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 16 states have (on average 1.3125) internal successors, (21), 17 states have internal predecessors, (21), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-23 02:16:33,981 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2021-11-23 02:16:33,981 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 9 [2021-11-23 02:16:33,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:16:33,982 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2021-11-23 02:16:33,982 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:16:33,982 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2021-11-23 02:16:33,983 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-23 02:16:33,983 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:16:33,983 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:16:33,984 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-23 02:16:33,984 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:16:33,985 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:16:33,985 INFO L85 PathProgramCache]: Analyzing trace with hash -439138420, now seen corresponding path program 1 times [2021-11-23 02:16:33,985 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:16:33,985 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [200807801] [2021-11-23 02:16:33,986 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:16:33,986 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:16:34,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:16:34,059 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:16:34,059 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:16:34,059 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [200807801] [2021-11-23 02:16:34,060 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [200807801] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:16:34,060 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:16:34,060 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:16:34,060 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1314134938] [2021-11-23 02:16:34,061 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:16:34,061 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:16:34,061 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:16:34,062 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:16:34,062 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:16:34,062 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-23 02:16:34,111 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:16:34,112 INFO L93 Difference]: Finished difference Result 39 states and 51 transitions. [2021-11-23 02:16:34,112 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:16:34,113 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2021-11-23 02:16:34,113 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:16:34,114 INFO L225 Difference]: With dead ends: 39 [2021-11-23 02:16:34,114 INFO L226 Difference]: Without dead ends: 37 [2021-11-23 02:16:34,115 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:16:34,116 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 11 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 90 SdHoareTripleChecker+Invalid, 30 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:16:34,117 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 90 Invalid, 30 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:16:34,118 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-11-23 02:16:34,125 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 30. [2021-11-23 02:16:34,125 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 19 states have (on average 1.263157894736842) internal successors, (24), 20 states have internal predecessors, (24), 7 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-23 02:16:34,126 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2021-11-23 02:16:34,126 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 12 [2021-11-23 02:16:34,127 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:16:34,127 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2021-11-23 02:16:34,127 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-23 02:16:34,127 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2021-11-23 02:16:34,128 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-23 02:16:34,128 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:16:34,128 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:16:34,129 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-23 02:16:34,129 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:16:34,130 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:16:34,130 INFO L85 PathProgramCache]: Analyzing trace with hash -235147060, now seen corresponding path program 1 times [2021-11-23 02:16:34,130 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:16:34,130 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1264587343] [2021-11-23 02:16:34,130 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:16:34,131 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:16:34,144 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 02:16:34,144 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1731765548] [2021-11-23 02:16:34,144 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:16:34,144 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:16:34,145 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ca5037d-439c-4945-80c6-92b5fb929c8f/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:16:34,160 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ca5037d-439c-4945-80c6-92b5fb929c8f/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:16:34,191 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ca5037d-439c-4945-80c6-92b5fb929c8f/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 02:16:34,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:16:34,245 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 02:16:34,249 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:16:34,473 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 02:16:34,474 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:16:34,474 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:16:34,474 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1264587343] [2021-11-23 02:16:34,475 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 02:16:34,475 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1731765548] [2021-11-23 02:16:34,475 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1731765548] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:16:34,475 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:16:34,476 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:16:34,476 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [522626248] [2021-11-23 02:16:34,476 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:16:34,477 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:16:34,477 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:16:34,477 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:16:34,478 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:16:34,478 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-23 02:16:34,546 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:16:34,546 INFO L93 Difference]: Finished difference Result 58 states and 78 transitions. [2021-11-23 02:16:34,548 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:16:34,548 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 17 [2021-11-23 02:16:34,549 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:16:34,552 INFO L225 Difference]: With dead ends: 58 [2021-11-23 02:16:34,557 INFO L226 Difference]: Without dead ends: 44 [2021-11-23 02:16:34,558 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:16:34,560 INFO L933 BasicCegarLoop]: 29 mSDtfsCounter, 10 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 99 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:16:34,563 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 99 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:16:34,564 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-11-23 02:16:34,573 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2021-11-23 02:16:34,577 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 26 states have (on average 1.2692307692307692) internal successors, (33), 28 states have internal predecessors, (33), 13 states have call successors, (13), 4 states have call predecessors, (13), 4 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-11-23 02:16:34,582 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 57 transitions. [2021-11-23 02:16:34,583 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 57 transitions. Word has length 17 [2021-11-23 02:16:34,584 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:16:34,584 INFO L470 AbstractCegarLoop]: Abstraction has 44 states and 57 transitions. [2021-11-23 02:16:34,584 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-23 02:16:34,585 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 57 transitions. [2021-11-23 02:16:34,586 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-23 02:16:34,587 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:16:34,587 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:16:34,625 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ca5037d-439c-4945-80c6-92b5fb929c8f/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-23 02:16:34,808 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ca5037d-439c-4945-80c6-92b5fb929c8f/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:16:34,808 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:16:34,809 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:16:34,809 INFO L85 PathProgramCache]: Analyzing trace with hash 2012527405, now seen corresponding path program 1 times [2021-11-23 02:16:34,809 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:16:34,809 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [875834733] [2021-11-23 02:16:34,809 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:16:34,810 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:16:34,827 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 02:16:34,827 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1671737842] [2021-11-23 02:16:34,827 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:16:34,827 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:16:34,828 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ca5037d-439c-4945-80c6-92b5fb929c8f/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:16:34,837 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ca5037d-439c-4945-80c6-92b5fb929c8f/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:16:34,865 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ca5037d-439c-4945-80c6-92b5fb929c8f/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 02:16:34,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:16:34,892 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 02:16:34,894 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:16:35,044 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 02:16:35,045 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:16:35,045 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:16:35,045 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [875834733] [2021-11-23 02:16:35,046 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 02:16:35,050 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1671737842] [2021-11-23 02:16:35,050 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1671737842] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:16:35,051 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:16:35,051 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:16:35,051 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1255800995] [2021-11-23 02:16:35,051 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:16:35,052 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:16:35,052 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:16:35,052 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:16:35,053 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:16:35,053 INFO L87 Difference]: Start difference. First operand 44 states and 57 transitions. Second operand has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-23 02:16:35,126 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:16:35,126 INFO L93 Difference]: Finished difference Result 57 states and 74 transitions. [2021-11-23 02:16:35,126 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:16:35,127 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 25 [2021-11-23 02:16:35,129 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:16:35,131 INFO L225 Difference]: With dead ends: 57 [2021-11-23 02:16:35,131 INFO L226 Difference]: Without dead ends: 49 [2021-11-23 02:16:35,132 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:16:35,140 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 9 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 76 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:16:35,140 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 76 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:16:35,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-11-23 02:16:35,156 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 48. [2021-11-23 02:16:35,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 29 states have (on average 1.2413793103448276) internal successors, (36), 31 states have internal predecessors, (36), 13 states have call successors, (13), 5 states have call predecessors, (13), 5 states have return successors, (12), 11 states have call predecessors, (12), 12 states have call successors, (12) [2021-11-23 02:16:35,163 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 61 transitions. [2021-11-23 02:16:35,164 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 61 transitions. Word has length 25 [2021-11-23 02:16:35,164 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:16:35,164 INFO L470 AbstractCegarLoop]: Abstraction has 48 states and 61 transitions. [2021-11-23 02:16:35,164 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-23 02:16:35,164 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 61 transitions. [2021-11-23 02:16:35,165 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-23 02:16:35,167 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:16:35,167 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:16:35,205 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ca5037d-439c-4945-80c6-92b5fb929c8f/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-23 02:16:35,367 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ca5037d-439c-4945-80c6-92b5fb929c8f/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-23 02:16:35,368 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:16:35,368 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:16:35,368 INFO L85 PathProgramCache]: Analyzing trace with hash 292094342, now seen corresponding path program 1 times [2021-11-23 02:16:35,368 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:16:35,368 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [77355803] [2021-11-23 02:16:35,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:16:35,369 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:16:35,376 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 02:16:35,376 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [918293130] [2021-11-23 02:16:35,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:16:35,377 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:16:35,377 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ca5037d-439c-4945-80c6-92b5fb929c8f/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:16:35,380 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ca5037d-439c-4945-80c6-92b5fb929c8f/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:16:35,382 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ca5037d-439c-4945-80c6-92b5fb929c8f/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-23 02:16:35,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:16:35,429 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 02:16:35,432 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:16:35,551 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 18 proven. 2 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-23 02:16:35,551 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:16:35,654 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-23 02:16:35,655 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:16:35,655 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [77355803] [2021-11-23 02:16:35,655 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 02:16:35,655 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [918293130] [2021-11-23 02:16:35,655 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [918293130] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:16:35,655 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1718995999] [2021-11-23 02:16:35,676 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-23 02:16:35,676 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:16:35,681 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:16:35,686 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:16:35,687 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:16:38,352 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 20 for LOIs [2021-11-23 02:16:38,372 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:16:39,491 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1030#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:16:39,491 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:16:39,492 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 02:16:39,492 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5] total 8 [2021-11-23 02:16:39,492 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [813121505] [2021-11-23 02:16:39,492 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 02:16:39,493 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 02:16:39,493 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:16:39,493 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 02:16:39,493 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=313, Unknown=0, NotChecked=0, Total=380 [2021-11-23 02:16:39,494 INFO L87 Difference]: Start difference. First operand 48 states and 61 transitions. Second operand has 8 states, 8 states have (on average 3.125) internal successors, (25), 8 states have internal predecessors, (25), 3 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) [2021-11-23 02:16:39,636 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:16:39,636 INFO L93 Difference]: Finished difference Result 134 states and 162 transitions. [2021-11-23 02:16:39,636 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-23 02:16:39,636 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.125) internal successors, (25), 8 states have internal predecessors, (25), 3 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) Word has length 32 [2021-11-23 02:16:39,637 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:16:39,639 INFO L225 Difference]: With dead ends: 134 [2021-11-23 02:16:39,639 INFO L226 Difference]: Without dead ends: 111 [2021-11-23 02:16:39,640 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 74 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=87, Invalid=419, Unknown=0, NotChecked=0, Total=506 [2021-11-23 02:16:39,641 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 37 mSDsluCounter, 93 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 126 SdHoareTripleChecker+Invalid, 65 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:16:39,641 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 126 Invalid, 65 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 52 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:16:39,642 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2021-11-23 02:16:39,654 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 105. [2021-11-23 02:16:39,654 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 105 states, 67 states have (on average 1.1940298507462686) internal successors, (80), 70 states have internal predecessors, (80), 23 states have call successors, (23), 14 states have call predecessors, (23), 14 states have return successors, (21), 20 states have call predecessors, (21), 21 states have call successors, (21) [2021-11-23 02:16:39,656 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 124 transitions. [2021-11-23 02:16:39,656 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 124 transitions. Word has length 32 [2021-11-23 02:16:39,656 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:16:39,656 INFO L470 AbstractCegarLoop]: Abstraction has 105 states and 124 transitions. [2021-11-23 02:16:39,657 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 3.125) internal successors, (25), 8 states have internal predecessors, (25), 3 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) [2021-11-23 02:16:39,657 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 124 transitions. [2021-11-23 02:16:39,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-23 02:16:39,658 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:16:39,658 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1] [2021-11-23 02:16:39,695 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ca5037d-439c-4945-80c6-92b5fb929c8f/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2021-11-23 02:16:39,876 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ca5037d-439c-4945-80c6-92b5fb929c8f/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:16:39,876 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:16:39,876 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:16:39,877 INFO L85 PathProgramCache]: Analyzing trace with hash 747162997, now seen corresponding path program 1 times [2021-11-23 02:16:39,877 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:16:39,877 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [971911229] [2021-11-23 02:16:39,877 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:16:39,877 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:16:39,886 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 02:16:39,886 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [789047971] [2021-11-23 02:16:39,887 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:16:39,887 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:16:39,887 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ca5037d-439c-4945-80c6-92b5fb929c8f/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:16:39,888 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ca5037d-439c-4945-80c6-92b5fb929c8f/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:16:39,914 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ca5037d-439c-4945-80c6-92b5fb929c8f/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-23 02:16:39,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:16:39,938 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 02:16:39,940 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:16:40,079 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 02:16:40,079 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:16:40,174 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-23 02:16:40,174 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:16:40,174 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [971911229] [2021-11-23 02:16:40,174 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 02:16:40,175 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [789047971] [2021-11-23 02:16:40,175 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [789047971] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-23 02:16:40,175 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:16:40,175 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 7 [2021-11-23 02:16:40,175 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2013159937] [2021-11-23 02:16:40,176 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:16:40,176 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:16:40,176 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:16:40,177 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:16:40,177 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:16:40,177 INFO L87 Difference]: Start difference. First operand 105 states and 124 transitions. Second operand has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-23 02:16:40,386 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:16:40,387 INFO L93 Difference]: Finished difference Result 116 states and 134 transitions. [2021-11-23 02:16:40,387 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:16:40,387 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 35 [2021-11-23 02:16:40,387 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:16:40,388 INFO L225 Difference]: With dead ends: 116 [2021-11-23 02:16:40,388 INFO L226 Difference]: Without dead ends: 112 [2021-11-23 02:16:40,389 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 61 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:16:40,390 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 11 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:16:40,390 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 84 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:16:40,391 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2021-11-23 02:16:40,410 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 111. [2021-11-23 02:16:40,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 72 states have (on average 1.1527777777777777) internal successors, (83), 74 states have internal predecessors, (83), 23 states have call successors, (23), 16 states have call predecessors, (23), 15 states have return successors, (21), 20 states have call predecessors, (21), 21 states have call successors, (21) [2021-11-23 02:16:40,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 127 transitions. [2021-11-23 02:16:40,418 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 127 transitions. Word has length 35 [2021-11-23 02:16:40,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:16:40,418 INFO L470 AbstractCegarLoop]: Abstraction has 111 states and 127 transitions. [2021-11-23 02:16:40,418 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-23 02:16:40,419 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 127 transitions. [2021-11-23 02:16:40,420 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-23 02:16:40,422 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:16:40,422 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:16:40,454 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ca5037d-439c-4945-80c6-92b5fb929c8f/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-23 02:16:40,648 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ca5037d-439c-4945-80c6-92b5fb929c8f/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:16:40,648 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:16:40,648 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:16:40,648 INFO L85 PathProgramCache]: Analyzing trace with hash 1125945480, now seen corresponding path program 1 times [2021-11-23 02:16:40,649 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:16:40,649 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [975853441] [2021-11-23 02:16:40,649 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:16:40,649 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:16:40,660 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 02:16:40,675 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1104517296] [2021-11-23 02:16:40,676 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:16:40,676 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:16:40,676 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ca5037d-439c-4945-80c6-92b5fb929c8f/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:16:40,677 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ca5037d-439c-4945-80c6-92b5fb929c8f/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:16:40,692 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ca5037d-439c-4945-80c6-92b5fb929c8f/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-23 02:16:40,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:16:40,735 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 02:16:40,738 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:16:40,862 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 36 proven. 42 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-23 02:16:40,862 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:16:41,003 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 14 proven. 6 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2021-11-23 02:16:41,003 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:16:41,003 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [975853441] [2021-11-23 02:16:41,004 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 02:16:41,004 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1104517296] [2021-11-23 02:16:41,004 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1104517296] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:16:41,004 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [701931471] [2021-11-23 02:16:41,009 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-23 02:16:41,009 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:16:41,009 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:16:41,010 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:16:41,010 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:16:42,824 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 20 for LOIs [2021-11-23 02:16:42,842 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:16:43,995 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2201#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:16:43,996 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:16:43,996 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 02:16:43,996 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6] total 10 [2021-11-23 02:16:43,996 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [345748449] [2021-11-23 02:16:43,997 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 02:16:44,000 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-23 02:16:44,000 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:16:44,001 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-23 02:16:44,001 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=376, Unknown=0, NotChecked=0, Total=462 [2021-11-23 02:16:44,002 INFO L87 Difference]: Start difference. First operand 111 states and 127 transitions. Second operand has 10 states, 10 states have (on average 3.2) internal successors, (32), 10 states have internal predecessors, (32), 5 states have call successors, (15), 4 states have call predecessors, (15), 4 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) [2021-11-23 02:16:44,229 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:16:44,229 INFO L93 Difference]: Finished difference Result 219 states and 255 transitions. [2021-11-23 02:16:44,230 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 02:16:44,231 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.2) internal successors, (32), 10 states have internal predecessors, (32), 5 states have call successors, (15), 4 states have call predecessors, (15), 4 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) Word has length 48 [2021-11-23 02:16:44,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:16:44,237 INFO L225 Difference]: With dead ends: 219 [2021-11-23 02:16:44,237 INFO L226 Difference]: Without dead ends: 198 [2021-11-23 02:16:44,238 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 119 SyntacticMatches, 3 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 201 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=105, Invalid=495, Unknown=0, NotChecked=0, Total=600 [2021-11-23 02:16:44,241 INFO L933 BasicCegarLoop]: 50 mSDtfsCounter, 85 mSDsluCounter, 135 mSDsCounter, 0 mSdLazyCounter, 96 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 85 SdHoareTripleChecker+Valid, 180 SdHoareTripleChecker+Invalid, 137 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 96 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:16:44,241 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [85 Valid, 180 Invalid, 137 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 96 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:16:44,242 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 198 states. [2021-11-23 02:16:44,267 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 198 to 191. [2021-11-23 02:16:44,268 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 191 states, 122 states have (on average 1.1557377049180328) internal successors, (141), 128 states have internal predecessors, (141), 43 states have call successors, (43), 26 states have call predecessors, (43), 25 states have return successors, (39), 36 states have call predecessors, (39), 39 states have call successors, (39) [2021-11-23 02:16:44,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 191 states to 191 states and 223 transitions. [2021-11-23 02:16:44,271 INFO L78 Accepts]: Start accepts. Automaton has 191 states and 223 transitions. Word has length 48 [2021-11-23 02:16:44,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:16:44,271 INFO L470 AbstractCegarLoop]: Abstraction has 191 states and 223 transitions. [2021-11-23 02:16:44,271 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 3.2) internal successors, (32), 10 states have internal predecessors, (32), 5 states have call successors, (15), 4 states have call predecessors, (15), 4 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) [2021-11-23 02:16:44,272 INFO L276 IsEmpty]: Start isEmpty. Operand 191 states and 223 transitions. [2021-11-23 02:16:44,273 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-23 02:16:44,274 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:16:44,274 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:16:44,307 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ca5037d-439c-4945-80c6-92b5fb929c8f/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2021-11-23 02:16:44,500 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ca5037d-439c-4945-80c6-92b5fb929c8f/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:16:44,500 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:16:44,500 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:16:44,500 INFO L85 PathProgramCache]: Analyzing trace with hash -1127123487, now seen corresponding path program 1 times [2021-11-23 02:16:44,501 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:16:44,501 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [59427561] [2021-11-23 02:16:44,501 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:16:44,501 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:16:44,509 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 02:16:44,509 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1772778138] [2021-11-23 02:16:44,509 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:16:44,510 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:16:44,510 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ca5037d-439c-4945-80c6-92b5fb929c8f/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:16:44,511 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ca5037d-439c-4945-80c6-92b5fb929c8f/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:16:44,534 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ca5037d-439c-4945-80c6-92b5fb929c8f/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-23 02:16:44,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:16:44,574 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-23 02:16:44,577 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:16:45,055 INFO L134 CoverageAnalysis]: Checked inductivity of 137 backedges. 16 proven. 9 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2021-11-23 02:16:45,055 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:16:47,577 INFO L134 CoverageAnalysis]: Checked inductivity of 137 backedges. 16 proven. 9 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2021-11-23 02:16:47,578 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:16:47,578 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [59427561] [2021-11-23 02:16:47,578 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 02:16:47,578 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1772778138] [2021-11-23 02:16:47,578 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1772778138] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:16:47,578 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1480158047] [2021-11-23 02:16:47,582 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-23 02:16:47,582 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:16:47,582 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:16:47,583 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:16:47,583 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:17:18,907 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2021-11-23 02:17:18,918 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:17:20,186 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3129#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-23 02:17:20,186 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:17:20,186 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 02:17:20,186 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2021-11-23 02:17:20,186 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [689627377] [2021-11-23 02:17:20,187 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 02:17:20,187 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-23 02:17:20,187 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:17:20,188 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-23 02:17:20,188 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=419, Unknown=0, NotChecked=0, Total=506 [2021-11-23 02:17:20,189 INFO L87 Difference]: Start difference. First operand 191 states and 223 transitions. Second operand has 10 states, 10 states have (on average 3.0) internal successors, (30), 9 states have internal predecessors, (30), 6 states have call successors, (18), 2 states have call predecessors, (18), 1 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) [2021-11-23 02:17:23,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:17:23,942 INFO L93 Difference]: Finished difference Result 237 states and 268 transitions. [2021-11-23 02:17:23,942 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-23 02:17:23,943 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.0) internal successors, (30), 9 states have internal predecessors, (30), 6 states have call successors, (18), 2 states have call predecessors, (18), 1 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) Word has length 56 [2021-11-23 02:17:23,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:17:23,945 INFO L225 Difference]: With dead ends: 237 [2021-11-23 02:17:23,945 INFO L226 Difference]: Without dead ends: 227 [2021-11-23 02:17:23,946 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 142 SyntacticMatches, 3 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=119, Invalid=583, Unknown=0, NotChecked=0, Total=702 [2021-11-23 02:17:23,947 INFO L933 BasicCegarLoop]: 39 mSDtfsCounter, 38 mSDsluCounter, 177 mSDsCounter, 0 mSdLazyCounter, 147 mSolverCounterSat, 56 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 214 SdHoareTripleChecker+Invalid, 203 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 56 IncrementalHoareTripleChecker+Valid, 147 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 02:17:23,947 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 214 Invalid, 203 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [56 Valid, 147 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-23 02:17:23,948 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 227 states. [2021-11-23 02:17:23,976 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 227 to 220. [2021-11-23 02:17:23,977 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 220 states, 145 states have (on average 1.1310344827586207) internal successors, (164), 152 states have internal predecessors, (164), 42 states have call successors, (42), 32 states have call predecessors, (42), 32 states have return successors, (39), 35 states have call predecessors, (39), 39 states have call successors, (39) [2021-11-23 02:17:23,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 220 states to 220 states and 245 transitions. [2021-11-23 02:17:23,979 INFO L78 Accepts]: Start accepts. Automaton has 220 states and 245 transitions. Word has length 56 [2021-11-23 02:17:23,980 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:17:23,980 INFO L470 AbstractCegarLoop]: Abstraction has 220 states and 245 transitions. [2021-11-23 02:17:23,980 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 3.0) internal successors, (30), 9 states have internal predecessors, (30), 6 states have call successors, (18), 2 states have call predecessors, (18), 1 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) [2021-11-23 02:17:23,980 INFO L276 IsEmpty]: Start isEmpty. Operand 220 states and 245 transitions. [2021-11-23 02:17:23,982 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-23 02:17:23,983 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:17:23,983 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:17:24,013 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ca5037d-439c-4945-80c6-92b5fb929c8f/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-23 02:17:24,200 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ca5037d-439c-4945-80c6-92b5fb929c8f/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-23 02:17:24,200 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:17:24,201 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:17:24,201 INFO L85 PathProgramCache]: Analyzing trace with hash -638542057, now seen corresponding path program 2 times [2021-11-23 02:17:24,201 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:17:24,201 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1879020617] [2021-11-23 02:17:24,201 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:17:24,202 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:17:24,231 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 02:17:24,232 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1260348415] [2021-11-23 02:17:24,233 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:17:24,233 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:17:24,233 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ca5037d-439c-4945-80c6-92b5fb929c8f/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:17:24,234 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ca5037d-439c-4945-80c6-92b5fb929c8f/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:17:24,237 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ca5037d-439c-4945-80c6-92b5fb929c8f/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-23 02:17:24,280 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-23 02:17:24,280 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:17:24,281 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 02:17:24,285 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:17:24,602 INFO L134 CoverageAnalysis]: Checked inductivity of 172 backedges. 18 proven. 10 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2021-11-23 02:17:24,602 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:17:26,884 INFO L134 CoverageAnalysis]: Checked inductivity of 172 backedges. 18 proven. 10 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2021-11-23 02:17:26,885 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:17:26,885 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1879020617] [2021-11-23 02:17:26,885 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 02:17:26,885 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1260348415] [2021-11-23 02:17:26,885 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1260348415] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:17:26,885 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [715511632] [2021-11-23 02:17:26,888 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-23 02:17:26,888 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:17:26,889 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:17:26,889 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:17:26,889 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:17:56,166 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2021-11-23 02:17:56,177 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:17:57,227 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4145#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-23 02:17:57,228 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:17:57,228 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 02:17:57,228 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 8 [2021-11-23 02:17:57,228 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1997828554] [2021-11-23 02:17:57,228 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 02:17:57,229 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 02:17:57,229 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:17:57,229 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 02:17:57,230 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=342, Unknown=0, NotChecked=0, Total=420 [2021-11-23 02:17:57,230 INFO L87 Difference]: Start difference. First operand 220 states and 245 transitions. Second operand has 8 states, 8 states have (on average 3.75) internal successors, (30), 7 states have internal predecessors, (30), 4 states have call successors, (20), 2 states have call predecessors, (20), 1 states have return successors, (18), 4 states have call predecessors, (18), 4 states have call successors, (18) [2021-11-23 02:18:02,388 WARN L227 SmtUtils]: Spent 5.04s on a formula simplification. DAG size of input: 38 DAG size of output: 38 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 02:18:02,940 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:18:02,941 INFO L93 Difference]: Finished difference Result 269 states and 304 transitions. [2021-11-23 02:18:02,943 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-23 02:18:02,944 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.75) internal successors, (30), 7 states have internal predecessors, (30), 4 states have call successors, (20), 2 states have call predecessors, (20), 1 states have return successors, (18), 4 states have call predecessors, (18), 4 states have call successors, (18) Word has length 61 [2021-11-23 02:18:02,944 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:18:02,947 INFO L225 Difference]: With dead ends: 269 [2021-11-23 02:18:02,947 INFO L226 Difference]: Without dead ends: 236 [2021-11-23 02:18:02,948 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 159 SyntacticMatches, 3 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=92, Invalid=414, Unknown=0, NotChecked=0, Total=506 [2021-11-23 02:18:02,949 INFO L933 BasicCegarLoop]: 45 mSDtfsCounter, 15 mSDsluCounter, 178 mSDsCounter, 0 mSdLazyCounter, 108 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 221 SdHoareTripleChecker+Invalid, 122 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 108 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 02:18:02,950 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 221 Invalid, 122 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 108 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-23 02:18:02,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 236 states. [2021-11-23 02:18:02,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 236 to 231. [2021-11-23 02:18:02,985 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 231 states, 153 states have (on average 1.1111111111111112) internal successors, (170), 159 states have internal predecessors, (170), 43 states have call successors, (43), 35 states have call predecessors, (43), 34 states have return successors, (39), 36 states have call predecessors, (39), 39 states have call successors, (39) [2021-11-23 02:18:02,987 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 231 states to 231 states and 252 transitions. [2021-11-23 02:18:02,988 INFO L78 Accepts]: Start accepts. Automaton has 231 states and 252 transitions. Word has length 61 [2021-11-23 02:18:02,988 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:18:02,988 INFO L470 AbstractCegarLoop]: Abstraction has 231 states and 252 transitions. [2021-11-23 02:18:02,989 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 3.75) internal successors, (30), 7 states have internal predecessors, (30), 4 states have call successors, (20), 2 states have call predecessors, (20), 1 states have return successors, (18), 4 states have call predecessors, (18), 4 states have call successors, (18) [2021-11-23 02:18:02,989 INFO L276 IsEmpty]: Start isEmpty. Operand 231 states and 252 transitions. [2021-11-23 02:18:02,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-23 02:18:02,991 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:18:02,991 INFO L514 BasicCegarLoop]: trace histogram [11, 10, 10, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:18:03,021 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ca5037d-439c-4945-80c6-92b5fb929c8f/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-23 02:18:03,200 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ca5037d-439c-4945-80c6-92b5fb929c8f/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-23 02:18:03,200 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:18:03,200 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:18:03,200 INFO L85 PathProgramCache]: Analyzing trace with hash -143001442, now seen corresponding path program 1 times [2021-11-23 02:18:03,200 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:18:03,201 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [799432194] [2021-11-23 02:18:03,201 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:18:03,201 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:18:03,206 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 02:18:03,206 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [518920486] [2021-11-23 02:18:03,210 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:18:03,210 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:18:03,210 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ca5037d-439c-4945-80c6-92b5fb929c8f/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:18:03,211 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ca5037d-439c-4945-80c6-92b5fb929c8f/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:18:03,211 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ca5037d-439c-4945-80c6-92b5fb929c8f/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-23 02:18:03,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:18:03,273 INFO L263 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-23 02:18:03,277 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:18:04,056 INFO L134 CoverageAnalysis]: Checked inductivity of 211 backedges. 66 proven. 13 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2021-11-23 02:18:04,056 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:18:04,377 INFO L134 CoverageAnalysis]: Checked inductivity of 211 backedges. 68 proven. 2 refuted. 0 times theorem prover too weak. 141 trivial. 0 not checked. [2021-11-23 02:18:04,378 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:18:04,378 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [799432194] [2021-11-23 02:18:04,378 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 02:18:04,378 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [518920486] [2021-11-23 02:18:04,378 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [518920486] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:18:04,378 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [541118633] [2021-11-23 02:18:04,383 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-23 02:18:04,383 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:18:04,383 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:18:04,383 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:18:04,384 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:18:31,769 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2021-11-23 02:18:31,794 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:18:33,088 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5258#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-23 02:18:33,088 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:18:33,088 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 02:18:33,089 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 9] total 16 [2021-11-23 02:18:33,089 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1793247984] [2021-11-23 02:18:33,089 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 02:18:33,089 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 02:18:33,090 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:18:33,090 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 02:18:33,091 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=734, Unknown=0, NotChecked=0, Total=870 [2021-11-23 02:18:33,091 INFO L87 Difference]: Start difference. First operand 231 states and 252 transitions. Second operand has 16 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 12 states have internal predecessors, (33), 8 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 8 states have call predecessors, (17), 6 states have call successors, (17) [2021-11-23 02:18:33,506 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:18:33,506 INFO L93 Difference]: Finished difference Result 249 states and 270 transitions. [2021-11-23 02:18:33,507 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-23 02:18:33,507 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 12 states have internal predecessors, (33), 8 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 8 states have call predecessors, (17), 6 states have call successors, (17) Word has length 67 [2021-11-23 02:18:33,509 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:18:33,510 INFO L225 Difference]: With dead ends: 249 [2021-11-23 02:18:33,511 INFO L226 Difference]: Without dead ends: 216 [2021-11-23 02:18:33,511 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 167 SyntacticMatches, 4 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 309 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=150, Invalid=842, Unknown=0, NotChecked=0, Total=992 [2021-11-23 02:18:33,512 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 60 mSDsluCounter, 128 mSDsCounter, 0 mSdLazyCounter, 250 mSolverCounterSat, 61 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 150 SdHoareTripleChecker+Invalid, 311 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 61 IncrementalHoareTripleChecker+Valid, 250 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:18:33,513 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [73 Valid, 150 Invalid, 311 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [61 Valid, 250 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 02:18:33,513 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 216 states. [2021-11-23 02:18:33,539 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 216 to 193. [2021-11-23 02:18:33,540 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 193 states, 129 states have (on average 1.1162790697674418) internal successors, (144), 132 states have internal predecessors, (144), 35 states have call successors, (35), 29 states have call predecessors, (35), 28 states have return successors, (33), 31 states have call predecessors, (33), 33 states have call successors, (33) [2021-11-23 02:18:33,542 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 193 states and 212 transitions. [2021-11-23 02:18:33,542 INFO L78 Accepts]: Start accepts. Automaton has 193 states and 212 transitions. Word has length 67 [2021-11-23 02:18:33,542 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:18:33,542 INFO L470 AbstractCegarLoop]: Abstraction has 193 states and 212 transitions. [2021-11-23 02:18:33,543 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 12 states have internal predecessors, (33), 8 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 8 states have call predecessors, (17), 6 states have call successors, (17) [2021-11-23 02:18:33,543 INFO L276 IsEmpty]: Start isEmpty. Operand 193 states and 212 transitions. [2021-11-23 02:18:33,544 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-11-23 02:18:33,544 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:18:33,545 INFO L514 BasicCegarLoop]: trace histogram [13, 12, 12, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:18:33,571 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ca5037d-439c-4945-80c6-92b5fb929c8f/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-23 02:18:33,760 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ca5037d-439c-4945-80c6-92b5fb929c8f/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:18:33,760 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:18:33,760 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:18:33,760 INFO L85 PathProgramCache]: Analyzing trace with hash -319401384, now seen corresponding path program 1 times [2021-11-23 02:18:33,760 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:18:33,760 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1192980626] [2021-11-23 02:18:33,761 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:18:33,761 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:18:33,768 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 02:18:33,768 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1713810315] [2021-11-23 02:18:33,768 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:18:33,768 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:18:33,769 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ca5037d-439c-4945-80c6-92b5fb929c8f/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:18:33,790 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ca5037d-439c-4945-80c6-92b5fb929c8f/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:18:33,819 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ca5037d-439c-4945-80c6-92b5fb929c8f/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-23 02:18:33,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:18:33,850 INFO L263 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 02:18:33,852 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:18:34,043 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 84 proven. 0 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2021-11-23 02:18:34,043 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:18:34,043 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:18:34,043 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1192980626] [2021-11-23 02:18:34,043 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 02:18:34,044 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1713810315] [2021-11-23 02:18:34,044 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1713810315] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:18:34,044 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:18:34,044 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:18:34,044 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [446996449] [2021-11-23 02:18:34,044 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:18:34,045 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:18:34,045 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:18:34,045 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:18:34,045 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:18:34,046 INFO L87 Difference]: Start difference. First operand 193 states and 212 transitions. Second operand has 5 states, 5 states have (on average 4.2) internal successors, (21), 5 states have internal predecessors, (21), 4 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2021-11-23 02:18:34,116 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:18:34,116 INFO L93 Difference]: Finished difference Result 210 states and 231 transitions. [2021-11-23 02:18:34,117 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:18:34,117 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.2) internal successors, (21), 5 states have internal predecessors, (21), 4 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) Word has length 77 [2021-11-23 02:18:34,120 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:18:34,122 INFO L225 Difference]: With dead ends: 210 [2021-11-23 02:18:34,122 INFO L226 Difference]: Without dead ends: 190 [2021-11-23 02:18:34,123 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:18:34,124 INFO L933 BasicCegarLoop]: 51 mSDtfsCounter, 18 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 105 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:18:34,125 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 105 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:18:34,126 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2021-11-23 02:18:34,154 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 186. [2021-11-23 02:18:34,154 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 186 states, 125 states have (on average 1.088) internal successors, (136), 127 states have internal predecessors, (136), 33 states have call successors, (33), 27 states have call predecessors, (33), 27 states have return successors, (32), 31 states have call predecessors, (32), 32 states have call successors, (32) [2021-11-23 02:18:34,156 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 186 states to 186 states and 201 transitions. [2021-11-23 02:18:34,156 INFO L78 Accepts]: Start accepts. Automaton has 186 states and 201 transitions. Word has length 77 [2021-11-23 02:18:34,157 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:18:34,157 INFO L470 AbstractCegarLoop]: Abstraction has 186 states and 201 transitions. [2021-11-23 02:18:34,158 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.2) internal successors, (21), 5 states have internal predecessors, (21), 4 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2021-11-23 02:18:34,158 INFO L276 IsEmpty]: Start isEmpty. Operand 186 states and 201 transitions. [2021-11-23 02:18:34,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-11-23 02:18:34,159 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:18:34,160 INFO L514 BasicCegarLoop]: trace histogram [14, 13, 13, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1] [2021-11-23 02:18:34,195 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ca5037d-439c-4945-80c6-92b5fb929c8f/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-23 02:18:34,384 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ca5037d-439c-4945-80c6-92b5fb929c8f/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:18:34,384 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:18:34,384 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:18:34,384 INFO L85 PathProgramCache]: Analyzing trace with hash 1528689375, now seen corresponding path program 3 times [2021-11-23 02:18:34,384 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:18:34,384 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [454015137] [2021-11-23 02:18:34,385 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:18:34,385 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:18:34,392 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 02:18:34,392 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1297919783] [2021-11-23 02:18:34,392 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:18:34,392 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:18:34,392 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ca5037d-439c-4945-80c6-92b5fb929c8f/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:18:34,393 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ca5037d-439c-4945-80c6-92b5fb929c8f/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:18:34,396 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ca5037d-439c-4945-80c6-92b5fb929c8f/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-23 02:18:34,445 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:18:34,446 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:18:34,447 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 48 conjunts are in the unsatisfiable core [2021-11-23 02:18:34,450 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:21:21,836 WARN L227 SmtUtils]: Spent 5.67s on a formula simplification. DAG size of input: 3 DAG size of output: 1 (called from [L1066] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2021-11-23 02:21:38,501 INFO L134 CoverageAnalysis]: Checked inductivity of 367 backedges. 86 proven. 82 refuted. 7 times theorem prover too weak. 192 trivial. 0 not checked. [2021-11-23 02:21:38,501 INFO L328 TraceCheckSpWp]: Computing backward predicates...