./Ultimate.py --spec ../../sv-benchmarks/c/ReachSafety.prp --file ../../sv-benchmarks/c/ldv-regression/test24_false-unreach-call.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 5842f4b8 Calling Ultimate with: java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/working_dir_188a43f3-60dd-457b-9453-be20e5fa91ce/bin-2019/utaipan/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/working_dir_188a43f3-60dd-457b-9453-be20e5fa91ce/bin-2019/utaipan/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/working_dir_188a43f3-60dd-457b-9453-be20e5fa91ce/bin-2019/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/working_dir_188a43f3-60dd-457b-9453-be20e5fa91ce/bin-2019/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/ldv-regression/test24_false-unreach-call.c -s /tmp/vcloud-vcloud-master/worker/working_dir_188a43f3-60dd-457b-9453-be20e5fa91ce/bin-2019/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/working_dir_188a43f3-60dd-457b-9453-be20e5fa91ce/bin-2019/utaipan --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(__VERIFIER_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 45294379b83c6b60e0b0199955cdf7244f057430 ................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE --- Real Ultimate output --- This is Ultimate 0.1.23-5842f4b [2018-11-18 13:42:23,627 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-11-18 13:42:23,628 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-11-18 13:42:23,637 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-11-18 13:42:23,637 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-11-18 13:42:23,638 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-11-18 13:42:23,638 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-11-18 13:42:23,639 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-11-18 13:42:23,640 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-11-18 13:42:23,640 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-11-18 13:42:23,641 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-11-18 13:42:23,641 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-11-18 13:42:23,641 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-11-18 13:42:23,642 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-11-18 13:42:23,642 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-11-18 13:42:23,643 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-11-18 13:42:23,643 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-11-18 13:42:23,645 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-11-18 13:42:23,646 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-11-18 13:42:23,647 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-11-18 13:42:23,648 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-11-18 13:42:23,648 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-11-18 13:42:23,649 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-11-18 13:42:23,649 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-11-18 13:42:23,650 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-11-18 13:42:23,650 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-11-18 13:42:23,651 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-11-18 13:42:23,651 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-11-18 13:42:23,652 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-11-18 13:42:23,653 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-11-18 13:42:23,653 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-11-18 13:42:23,653 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-11-18 13:42:23,653 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-11-18 13:42:23,653 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-11-18 13:42:23,654 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-11-18 13:42:23,654 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-11-18 13:42:23,654 INFO L98 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/working_dir_188a43f3-60dd-457b-9453-be20e5fa91ce/bin-2019/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2018-11-18 13:42:23,664 INFO L110 SettingsManager]: Loading preferences was successful [2018-11-18 13:42:23,664 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-11-18 13:42:23,665 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-11-18 13:42:23,665 INFO L133 SettingsManager]: * User list type=DISABLED [2018-11-18 13:42:23,665 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-11-18 13:42:23,665 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-11-18 13:42:23,665 INFO L133 SettingsManager]: * Explicit value domain=true [2018-11-18 13:42:23,665 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-11-18 13:42:23,666 INFO L133 SettingsManager]: * Octagon Domain=false [2018-11-18 13:42:23,666 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-11-18 13:42:23,666 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-11-18 13:42:23,666 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-11-18 13:42:23,666 INFO L133 SettingsManager]: * Interval Domain=false [2018-11-18 13:42:23,667 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-11-18 13:42:23,667 INFO L133 SettingsManager]: * sizeof long=4 [2018-11-18 13:42:23,667 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-11-18 13:42:23,667 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-11-18 13:42:23,667 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-11-18 13:42:23,667 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-11-18 13:42:23,667 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-11-18 13:42:23,668 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-11-18 13:42:23,668 INFO L133 SettingsManager]: * sizeof long double=12 [2018-11-18 13:42:23,668 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-11-18 13:42:23,668 INFO L133 SettingsManager]: * Use constant arrays=true [2018-11-18 13:42:23,668 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-11-18 13:42:23,668 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-11-18 13:42:23,668 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-11-18 13:42:23,668 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-11-18 13:42:23,669 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-11-18 13:42:23,669 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-11-18 13:42:23,669 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-11-18 13:42:23,669 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-11-18 13:42:23,669 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-11-18 13:42:23,669 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-11-18 13:42:23,669 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-11-18 13:42:23,669 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-11-18 13:42:23,670 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-11-18 13:42:23,670 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES 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-vcloud-master/worker/working_dir_188a43f3-60dd-457b-9453-be20e5fa91ce/bin-2019/utaipan 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(__VERIFIER_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 -> 45294379b83c6b60e0b0199955cdf7244f057430 [2018-11-18 13:42:23,695 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-11-18 13:42:23,704 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-11-18 13:42:23,707 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-11-18 13:42:23,708 INFO L271 PluginConnector]: Initializing CDTParser... [2018-11-18 13:42:23,709 INFO L276 PluginConnector]: CDTParser initialized [2018-11-18 13:42:23,709 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/working_dir_188a43f3-60dd-457b-9453-be20e5fa91ce/bin-2019/utaipan/../../sv-benchmarks/c/ldv-regression/test24_false-unreach-call.c [2018-11-18 13:42:23,754 INFO L221 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_188a43f3-60dd-457b-9453-be20e5fa91ce/bin-2019/utaipan/data/001d61307/5b7640586b0147cd81b8844b2c820659/FLAGbdd45e48b [2018-11-18 13:42:24,064 INFO L307 CDTParser]: Found 1 translation units. [2018-11-18 13:42:24,064 INFO L161 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/working_dir_188a43f3-60dd-457b-9453-be20e5fa91ce/sv-benchmarks/c/ldv-regression/test24_false-unreach-call.c [2018-11-18 13:42:24,069 INFO L355 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_188a43f3-60dd-457b-9453-be20e5fa91ce/bin-2019/utaipan/data/001d61307/5b7640586b0147cd81b8844b2c820659/FLAGbdd45e48b [2018-11-18 13:42:24,079 INFO L363 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/working_dir_188a43f3-60dd-457b-9453-be20e5fa91ce/bin-2019/utaipan/data/001d61307/5b7640586b0147cd81b8844b2c820659 [2018-11-18 13:42:24,082 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-11-18 13:42:24,083 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2018-11-18 13:42:24,084 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-11-18 13:42:24,084 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-11-18 13:42:24,086 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-11-18 13:42:24,087 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.11 01:42:24" (1/1) ... [2018-11-18 13:42:24,089 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6e791d46 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 01:42:24, skipping insertion in model container [2018-11-18 13:42:24,089 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.11 01:42:24" (1/1) ... [2018-11-18 13:42:24,096 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-11-18 13:42:24,111 INFO L176 MainTranslator]: Built tables and reachable declarations [2018-11-18 13:42:24,231 INFO L201 PostProcessor]: Analyzing one entry point: main [2018-11-18 13:42:24,236 INFO L191 MainTranslator]: Completed pre-run [2018-11-18 13:42:24,247 INFO L201 PostProcessor]: Analyzing one entry point: main [2018-11-18 13:42:24,256 INFO L195 MainTranslator]: Completed translation [2018-11-18 13:42:24,256 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 01:42:24 WrapperNode [2018-11-18 13:42:24,256 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-11-18 13:42:24,257 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-11-18 13:42:24,257 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-11-18 13:42:24,257 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-11-18 13:42:24,262 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 01:42:24" (1/1) ... [2018-11-18 13:42:24,267 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 01:42:24" (1/1) ... [2018-11-18 13:42:24,271 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-11-18 13:42:24,272 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-11-18 13:42:24,272 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-11-18 13:42:24,272 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-11-18 13:42:24,278 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 01:42:24" (1/1) ... [2018-11-18 13:42:24,278 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 01:42:24" (1/1) ... [2018-11-18 13:42:24,279 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 01:42:24" (1/1) ... [2018-11-18 13:42:24,279 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 01:42:24" (1/1) ... [2018-11-18 13:42:24,285 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 01:42:24" (1/1) ... [2018-11-18 13:42:24,324 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 01:42:24" (1/1) ... [2018-11-18 13:42:24,325 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 01:42:24" (1/1) ... [2018-11-18 13:42:24,326 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-11-18 13:42:24,327 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-11-18 13:42:24,327 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-11-18 13:42:24,327 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-11-18 13:42:24,327 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 01:42:24" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_188a43f3-60dd-457b-9453-be20e5fa91ce/bin-2019/utaipan/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-11-18 13:42:24,361 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2018-11-18 13:42:24,361 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-11-18 13:42:24,361 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-11-18 13:42:24,362 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-11-18 13:42:24,362 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-11-18 13:42:24,362 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-11-18 13:42:24,362 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2018-11-18 13:42:24,362 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-11-18 13:42:24,362 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-11-18 13:42:24,362 INFO L130 BoogieDeclarations]: Found specification of procedure check [2018-11-18 13:42:24,362 INFO L138 BoogieDeclarations]: Found implementation of procedure check [2018-11-18 13:42:24,362 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-11-18 13:42:24,499 INFO L278 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-11-18 13:42:24,500 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.11 01:42:24 BoogieIcfgContainer [2018-11-18 13:42:24,500 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-11-18 13:42:24,500 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-11-18 13:42:24,500 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-11-18 13:42:24,502 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-11-18 13:42:24,502 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.11 01:42:24" (1/3) ... [2018-11-18 13:42:24,503 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@62050953 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.11 01:42:24, skipping insertion in model container [2018-11-18 13:42:24,503 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 01:42:24" (2/3) ... [2018-11-18 13:42:24,503 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@62050953 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.11 01:42:24, skipping insertion in model container [2018-11-18 13:42:24,503 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.11 01:42:24" (3/3) ... [2018-11-18 13:42:24,504 INFO L112 eAbstractionObserver]: Analyzing ICFG test24_false-unreach-call.c [2018-11-18 13:42:24,511 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-11-18 13:42:24,517 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-11-18 13:42:24,531 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-11-18 13:42:24,556 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-11-18 13:42:24,556 INFO L383 AbstractCegarLoop]: Hoare is true [2018-11-18 13:42:24,556 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-11-18 13:42:24,556 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-11-18 13:42:24,556 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-11-18 13:42:24,556 INFO L387 AbstractCegarLoop]: Difference is false [2018-11-18 13:42:24,557 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-11-18 13:42:24,557 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-11-18 13:42:24,569 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states. [2018-11-18 13:42:24,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-11-18 13:42:24,573 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 13:42:24,574 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 13:42:24,576 INFO L423 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 13:42:24,580 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 13:42:24,581 INFO L82 PathProgramCache]: Analyzing trace with hash -812155503, now seen corresponding path program 1 times [2018-11-18 13:42:24,582 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 13:42:24,619 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:42:24,619 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 13:42:24,619 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:42:24,619 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 13:42:24,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 13:42:24,666 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 13:42:24,667 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-18 13:42:24,667 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-11-18 13:42:24,668 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-18 13:42:24,670 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-11-18 13:42:24,678 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-11-18 13:42:24,678 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-11-18 13:42:24,680 INFO L87 Difference]: Start difference. First operand 27 states. Second operand 2 states. [2018-11-18 13:42:24,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 13:42:24,693 INFO L93 Difference]: Finished difference Result 45 states and 53 transitions. [2018-11-18 13:42:24,693 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-11-18 13:42:24,694 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 17 [2018-11-18 13:42:24,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 13:42:24,700 INFO L225 Difference]: With dead ends: 45 [2018-11-18 13:42:24,700 INFO L226 Difference]: Without dead ends: 22 [2018-11-18 13:42:24,703 INFO L604 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 [2018-11-18 13:42:24,714 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-11-18 13:42:24,725 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2018-11-18 13:42:24,726 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2018-11-18 13:42:24,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 23 transitions. [2018-11-18 13:42:24,727 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 23 transitions. Word has length 17 [2018-11-18 13:42:24,727 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 13:42:24,728 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 23 transitions. [2018-11-18 13:42:24,728 INFO L481 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-11-18 13:42:24,728 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 23 transitions. [2018-11-18 13:42:24,728 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-11-18 13:42:24,728 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 13:42:24,729 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 13:42:24,729 INFO L423 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 13:42:24,729 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 13:42:24,729 INFO L82 PathProgramCache]: Analyzing trace with hash 401379044, now seen corresponding path program 1 times [2018-11-18 13:42:24,729 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 13:42:24,730 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:42:24,730 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 13:42:24,731 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:42:24,731 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 13:42:24,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 13:42:24,787 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 13:42:24,787 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-18 13:42:24,787 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-11-18 13:42:24,787 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-18 13:42:24,788 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-11-18 13:42:24,789 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-11-18 13:42:24,789 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-11-18 13:42:24,789 INFO L87 Difference]: Start difference. First operand 22 states and 23 transitions. Second operand 3 states. [2018-11-18 13:42:24,810 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 13:42:24,810 INFO L93 Difference]: Finished difference Result 38 states and 40 transitions. [2018-11-18 13:42:24,811 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-11-18 13:42:24,811 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2018-11-18 13:42:24,811 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 13:42:24,812 INFO L225 Difference]: With dead ends: 38 [2018-11-18 13:42:24,812 INFO L226 Difference]: Without dead ends: 25 [2018-11-18 13:42:24,812 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-11-18 13:42:24,813 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-11-18 13:42:24,816 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 24. [2018-11-18 13:42:24,816 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-11-18 13:42:24,817 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2018-11-18 13:42:24,817 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 20 [2018-11-18 13:42:24,817 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 13:42:24,817 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2018-11-18 13:42:24,817 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-11-18 13:42:24,817 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2018-11-18 13:42:24,818 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-11-18 13:42:24,818 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 13:42:24,818 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 13:42:24,818 INFO L423 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 13:42:24,818 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 13:42:24,819 INFO L82 PathProgramCache]: Analyzing trace with hash 227309715, now seen corresponding path program 1 times [2018-11-18 13:42:24,819 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 13:42:24,820 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:42:24,820 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 13:42:24,820 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:42:24,820 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 13:42:24,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 13:42:24,867 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 13:42:24,868 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:42:24,868 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 13:42:24,868 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 24 with the following transitions: [2018-11-18 13:42:24,870 INFO L202 CegarAbsIntRunner]: [0], [1], [5], [9], [12], [14], [16], [20], [23], [27], [29], [32], [39], [42], [49], [52], [53], [54], [55], [56], [58], [59] [2018-11-18 13:42:24,893 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-11-18 13:42:24,893 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-11-18 13:42:25,044 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-11-18 13:42:25,045 INFO L272 AbstractInterpreter]: Visited 22 different actions 34 times. Merged at 3 different actions 9 times. Never widened. Performed 188 root evaluator evaluations with a maximum evaluation depth of 5. Performed 188 inverse root evaluator evaluations with a maximum inverse evaluation depth of 5. Found 2 fixpoints after 2 different actions. Largest state had 25 variables. [2018-11-18 13:42:25,053 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 13:42:25,054 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-11-18 13:42:25,054 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:42:25,054 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_188a43f3-60dd-457b-9453-be20e5fa91ce/bin-2019/utaipan/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 13:42:25,061 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 13:42:25,061 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-18 13:42:25,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 13:42:25,098 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 13:42:25,125 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 13:42:25,125 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 13:42:25,162 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 13:42:25,179 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 13:42:25,179 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2018-11-18 13:42:25,179 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 13:42:25,179 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-11-18 13:42:25,179 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-11-18 13:42:25,179 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-11-18 13:42:25,180 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 5 states. [2018-11-18 13:42:25,196 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 13:42:25,196 INFO L93 Difference]: Finished difference Result 41 states and 43 transitions. [2018-11-18 13:42:25,197 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-11-18 13:42:25,197 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 23 [2018-11-18 13:42:25,197 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 13:42:25,197 INFO L225 Difference]: With dead ends: 41 [2018-11-18 13:42:25,198 INFO L226 Difference]: Without dead ends: 28 [2018-11-18 13:42:25,199 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-11-18 13:42:25,199 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-11-18 13:42:25,202 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2018-11-18 13:42:25,202 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-11-18 13:42:25,202 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2018-11-18 13:42:25,203 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 23 [2018-11-18 13:42:25,203 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 13:42:25,203 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2018-11-18 13:42:25,203 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-11-18 13:42:25,203 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2018-11-18 13:42:25,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-11-18 13:42:25,204 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 13:42:25,204 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 13:42:25,204 INFO L423 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 13:42:25,204 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 13:42:25,204 INFO L82 PathProgramCache]: Analyzing trace with hash -1446544252, now seen corresponding path program 2 times [2018-11-18 13:42:25,204 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 13:42:25,205 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:42:25,205 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 13:42:25,205 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:42:25,206 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 13:42:25,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 13:42:25,266 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 13:42:25,266 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:42:25,266 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 13:42:25,266 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 13:42:25,266 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 13:42:25,266 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:42:25,266 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_188a43f3-60dd-457b-9453-be20e5fa91ce/bin-2019/utaipan/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 13:42:25,284 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-18 13:42:25,284 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-18 13:42:25,307 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-11-18 13:42:25,307 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 13:42:25,309 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 13:42:25,320 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 13:42:25,321 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 13:42:25,377 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 13:42:25,394 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 13:42:25,394 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2018-11-18 13:42:25,394 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 13:42:25,394 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-11-18 13:42:25,394 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-11-18 13:42:25,395 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-11-18 13:42:25,395 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 6 states. [2018-11-18 13:42:25,414 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 13:42:25,414 INFO L93 Difference]: Finished difference Result 44 states and 46 transitions. [2018-11-18 13:42:25,414 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-11-18 13:42:25,414 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 26 [2018-11-18 13:42:25,415 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 13:42:25,415 INFO L225 Difference]: With dead ends: 44 [2018-11-18 13:42:25,415 INFO L226 Difference]: Without dead ends: 31 [2018-11-18 13:42:25,415 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-11-18 13:42:25,416 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2018-11-18 13:42:25,417 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 30. [2018-11-18 13:42:25,417 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-11-18 13:42:25,418 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2018-11-18 13:42:25,418 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 26 [2018-11-18 13:42:25,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 13:42:25,418 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2018-11-18 13:42:25,418 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-11-18 13:42:25,419 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2018-11-18 13:42:25,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-11-18 13:42:25,419 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 13:42:25,419 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 13:42:25,419 INFO L423 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 13:42:25,419 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 13:42:25,419 INFO L82 PathProgramCache]: Analyzing trace with hash 1635198707, now seen corresponding path program 3 times [2018-11-18 13:42:25,419 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 13:42:25,420 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:42:25,420 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 13:42:25,420 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:42:25,420 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 13:42:25,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 13:42:25,460 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 13:42:25,460 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:42:25,460 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 13:42:25,460 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 13:42:25,461 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 13:42:25,461 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:42:25,461 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_188a43f3-60dd-457b-9453-be20e5fa91ce/bin-2019/utaipan/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 13:42:25,471 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-18 13:42:25,471 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-18 13:42:25,491 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-18 13:42:25,492 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 13:42:25,493 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 13:42:25,523 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 13:42:25,523 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 13:42:25,579 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 13:42:25,597 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 13:42:25,597 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 11 [2018-11-18 13:42:25,597 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 13:42:25,597 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-11-18 13:42:25,597 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-11-18 13:42:25,598 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2018-11-18 13:42:25,598 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand 7 states. [2018-11-18 13:42:25,616 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 13:42:25,617 INFO L93 Difference]: Finished difference Result 47 states and 49 transitions. [2018-11-18 13:42:25,617 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-11-18 13:42:25,617 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 29 [2018-11-18 13:42:25,617 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 13:42:25,618 INFO L225 Difference]: With dead ends: 47 [2018-11-18 13:42:25,618 INFO L226 Difference]: Without dead ends: 34 [2018-11-18 13:42:25,618 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2018-11-18 13:42:25,618 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-11-18 13:42:25,621 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2018-11-18 13:42:25,621 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-11-18 13:42:25,622 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2018-11-18 13:42:25,622 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 29 [2018-11-18 13:42:25,622 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 13:42:25,622 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2018-11-18 13:42:25,622 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-11-18 13:42:25,622 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2018-11-18 13:42:25,623 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-11-18 13:42:25,623 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 13:42:25,623 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 13:42:25,623 INFO L423 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 13:42:25,624 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 13:42:25,624 INFO L82 PathProgramCache]: Analyzing trace with hash 618770980, now seen corresponding path program 4 times [2018-11-18 13:42:25,624 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 13:42:25,624 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:42:25,625 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 13:42:25,625 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:42:25,625 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 13:42:25,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 13:42:25,711 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 13:42:25,711 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:42:25,711 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 13:42:25,712 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 13:42:25,712 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 13:42:25,712 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:42:25,712 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_188a43f3-60dd-457b-9453-be20e5fa91ce/bin-2019/utaipan/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 13:42:25,723 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 13:42:25,723 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-18 13:42:25,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 13:42:25,741 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 13:42:25,775 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 13:42:25,775 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 13:42:25,817 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 13:42:25,833 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 13:42:25,833 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 13 [2018-11-18 13:42:25,833 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 13:42:25,834 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-11-18 13:42:25,834 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-11-18 13:42:25,834 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2018-11-18 13:42:25,834 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 8 states. [2018-11-18 13:42:25,864 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 13:42:25,864 INFO L93 Difference]: Finished difference Result 50 states and 52 transitions. [2018-11-18 13:42:25,864 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-11-18 13:42:25,865 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 32 [2018-11-18 13:42:25,865 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 13:42:25,865 INFO L225 Difference]: With dead ends: 50 [2018-11-18 13:42:25,865 INFO L226 Difference]: Without dead ends: 37 [2018-11-18 13:42:25,866 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2018-11-18 13:42:25,866 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-11-18 13:42:25,869 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 36. [2018-11-18 13:42:25,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-11-18 13:42:25,870 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2018-11-18 13:42:25,870 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 32 [2018-11-18 13:42:25,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 13:42:25,871 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2018-11-18 13:42:25,871 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-11-18 13:42:25,871 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2018-11-18 13:42:25,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-11-18 13:42:25,871 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 13:42:25,872 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 13:42:25,872 INFO L423 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 13:42:25,872 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 13:42:25,872 INFO L82 PathProgramCache]: Analyzing trace with hash -260207277, now seen corresponding path program 5 times [2018-11-18 13:42:25,872 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 13:42:25,873 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:42:25,873 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 13:42:25,873 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:42:25,873 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 13:42:25,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 13:42:25,947 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 13:42:25,947 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:42:25,947 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 13:42:25,947 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 13:42:25,947 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 13:42:25,948 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:42:25,948 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_188a43f3-60dd-457b-9453-be20e5fa91ce/bin-2019/utaipan/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 13:42:25,957 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-18 13:42:25,958 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-18 13:42:25,997 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-11-18 13:42:25,997 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 13:42:26,000 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 13:42:26,012 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 13:42:26,012 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 13:42:26,090 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 13:42:26,106 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 13:42:26,106 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 15 [2018-11-18 13:42:26,107 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 13:42:26,107 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-11-18 13:42:26,107 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-11-18 13:42:26,107 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2018-11-18 13:42:26,108 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand 9 states. [2018-11-18 13:42:26,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 13:42:26,128 INFO L93 Difference]: Finished difference Result 53 states and 55 transitions. [2018-11-18 13:42:26,129 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-11-18 13:42:26,129 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 35 [2018-11-18 13:42:26,129 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 13:42:26,129 INFO L225 Difference]: With dead ends: 53 [2018-11-18 13:42:26,130 INFO L226 Difference]: Without dead ends: 40 [2018-11-18 13:42:26,130 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2018-11-18 13:42:26,130 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-11-18 13:42:26,133 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2018-11-18 13:42:26,133 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-11-18 13:42:26,135 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2018-11-18 13:42:26,135 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 35 [2018-11-18 13:42:26,136 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 13:42:26,136 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2018-11-18 13:42:26,136 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-11-18 13:42:26,136 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2018-11-18 13:42:26,138 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-11-18 13:42:26,138 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 13:42:26,138 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 13:42:26,138 INFO L423 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 13:42:26,139 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 13:42:26,139 INFO L82 PathProgramCache]: Analyzing trace with hash 514142148, now seen corresponding path program 6 times [2018-11-18 13:42:26,139 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 13:42:26,139 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:42:26,140 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 13:42:26,140 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:42:26,140 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 13:42:26,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 13:42:26,232 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 13:42:26,233 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:42:26,233 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 13:42:26,233 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 13:42:26,233 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 13:42:26,233 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:42:26,233 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_188a43f3-60dd-457b-9453-be20e5fa91ce/bin-2019/utaipan/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 13:42:26,240 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-18 13:42:26,240 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-18 13:42:26,262 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-18 13:42:26,262 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 13:42:26,265 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 13:42:26,278 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 13:42:26,278 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 13:42:26,365 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 13:42:26,381 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 13:42:26,381 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 17 [2018-11-18 13:42:26,381 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 13:42:26,381 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-11-18 13:42:26,382 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-11-18 13:42:26,382 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2018-11-18 13:42:26,382 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 10 states. [2018-11-18 13:42:26,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 13:42:26,410 INFO L93 Difference]: Finished difference Result 56 states and 58 transitions. [2018-11-18 13:42:26,411 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-11-18 13:42:26,411 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 38 [2018-11-18 13:42:26,411 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 13:42:26,412 INFO L225 Difference]: With dead ends: 56 [2018-11-18 13:42:26,412 INFO L226 Difference]: Without dead ends: 43 [2018-11-18 13:42:26,412 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 69 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2018-11-18 13:42:26,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-11-18 13:42:26,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 42. [2018-11-18 13:42:26,415 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-11-18 13:42:26,416 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2018-11-18 13:42:26,416 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 38 [2018-11-18 13:42:26,416 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 13:42:26,416 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2018-11-18 13:42:26,416 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-11-18 13:42:26,418 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2018-11-18 13:42:26,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-11-18 13:42:26,419 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 13:42:26,419 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 13:42:26,419 INFO L423 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 13:42:26,419 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 13:42:26,419 INFO L82 PathProgramCache]: Analyzing trace with hash 888515507, now seen corresponding path program 7 times [2018-11-18 13:42:26,419 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 13:42:26,420 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:42:26,420 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 13:42:26,420 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:42:26,420 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 13:42:26,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 13:42:26,487 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 13:42:26,487 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:42:26,487 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 13:42:26,487 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 13:42:26,487 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 13:42:26,487 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:42:26,488 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_188a43f3-60dd-457b-9453-be20e5fa91ce/bin-2019/utaipan/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 13:42:26,494 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 13:42:26,494 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-18 13:42:26,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 13:42:26,510 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 13:42:26,527 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 13:42:26,527 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 13:42:26,616 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 13:42:26,632 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 13:42:26,632 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 19 [2018-11-18 13:42:26,632 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 13:42:26,633 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-11-18 13:42:26,633 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-11-18 13:42:26,633 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-11-18 13:42:26,633 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand 11 states. [2018-11-18 13:42:26,657 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 13:42:26,657 INFO L93 Difference]: Finished difference Result 59 states and 61 transitions. [2018-11-18 13:42:26,657 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-11-18 13:42:26,657 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 41 [2018-11-18 13:42:26,658 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 13:42:26,659 INFO L225 Difference]: With dead ends: 59 [2018-11-18 13:42:26,659 INFO L226 Difference]: Without dead ends: 46 [2018-11-18 13:42:26,659 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 74 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-11-18 13:42:26,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-11-18 13:42:26,662 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2018-11-18 13:42:26,662 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-11-18 13:42:26,663 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2018-11-18 13:42:26,663 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 41 [2018-11-18 13:42:26,663 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 13:42:26,663 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2018-11-18 13:42:26,663 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-11-18 13:42:26,663 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2018-11-18 13:42:26,664 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-11-18 13:42:26,664 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 13:42:26,664 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 13:42:26,664 INFO L423 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 13:42:26,664 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 13:42:26,665 INFO L82 PathProgramCache]: Analyzing trace with hash -184814236, now seen corresponding path program 8 times [2018-11-18 13:42:26,665 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 13:42:26,665 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:42:26,665 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 13:42:26,666 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:42:26,666 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 13:42:26,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 13:42:26,748 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 13:42:26,748 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:42:26,748 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 13:42:26,748 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 13:42:26,748 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 13:42:26,748 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:42:26,748 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_188a43f3-60dd-457b-9453-be20e5fa91ce/bin-2019/utaipan/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 13:42:26,757 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-18 13:42:26,757 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-18 13:42:26,846 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-11-18 13:42:26,846 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 13:42:26,848 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 13:42:26,862 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 13:42:26,862 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 13:42:26,948 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 13:42:26,964 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 13:42:26,964 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 21 [2018-11-18 13:42:26,964 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 13:42:26,965 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-11-18 13:42:26,965 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-11-18 13:42:26,965 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2018-11-18 13:42:26,965 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand 12 states. [2018-11-18 13:42:26,986 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 13:42:26,986 INFO L93 Difference]: Finished difference Result 62 states and 64 transitions. [2018-11-18 13:42:26,986 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-11-18 13:42:26,987 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 44 [2018-11-18 13:42:26,987 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 13:42:26,987 INFO L225 Difference]: With dead ends: 62 [2018-11-18 13:42:26,987 INFO L226 Difference]: Without dead ends: 49 [2018-11-18 13:42:26,988 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 79 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2018-11-18 13:42:26,988 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-11-18 13:42:26,990 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 48. [2018-11-18 13:42:26,990 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-11-18 13:42:26,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 49 transitions. [2018-11-18 13:42:26,991 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 49 transitions. Word has length 44 [2018-11-18 13:42:26,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 13:42:26,991 INFO L480 AbstractCegarLoop]: Abstraction has 48 states and 49 transitions. [2018-11-18 13:42:26,991 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-11-18 13:42:26,991 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 49 transitions. [2018-11-18 13:42:26,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-11-18 13:42:26,992 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 13:42:26,992 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 13:42:26,992 INFO L423 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 13:42:26,992 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 13:42:26,992 INFO L82 PathProgramCache]: Analyzing trace with hash 280330771, now seen corresponding path program 9 times [2018-11-18 13:42:26,992 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 13:42:26,993 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:42:26,993 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 13:42:26,993 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:42:26,993 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 13:42:27,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 13:42:27,098 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 13:42:27,098 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:42:27,099 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 13:42:27,099 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 13:42:27,099 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 13:42:27,099 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:42:27,099 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_188a43f3-60dd-457b-9453-be20e5fa91ce/bin-2019/utaipan/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 13:42:27,109 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-18 13:42:27,109 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-18 13:42:27,125 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-18 13:42:27,125 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 13:42:27,127 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 13:42:27,141 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 13:42:27,141 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 13:42:27,250 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 13:42:27,266 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 13:42:27,266 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 23 [2018-11-18 13:42:27,266 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 13:42:27,266 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-11-18 13:42:27,267 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-11-18 13:42:27,267 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2018-11-18 13:42:27,267 INFO L87 Difference]: Start difference. First operand 48 states and 49 transitions. Second operand 13 states. [2018-11-18 13:42:27,305 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 13:42:27,305 INFO L93 Difference]: Finished difference Result 65 states and 67 transitions. [2018-11-18 13:42:27,305 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-11-18 13:42:27,305 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 47 [2018-11-18 13:42:27,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 13:42:27,306 INFO L225 Difference]: With dead ends: 65 [2018-11-18 13:42:27,306 INFO L226 Difference]: Without dead ends: 52 [2018-11-18 13:42:27,306 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 84 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2018-11-18 13:42:27,306 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2018-11-18 13:42:27,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2018-11-18 13:42:27,308 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-11-18 13:42:27,309 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2018-11-18 13:42:27,309 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 47 [2018-11-18 13:42:27,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 13:42:27,309 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2018-11-18 13:42:27,309 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-11-18 13:42:27,309 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2018-11-18 13:42:27,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2018-11-18 13:42:27,310 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 13:42:27,310 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 13:42:27,310 INFO L423 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 13:42:27,310 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 13:42:27,311 INFO L82 PathProgramCache]: Analyzing trace with hash 1850737412, now seen corresponding path program 10 times [2018-11-18 13:42:27,311 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 13:42:27,311 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:42:27,311 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 13:42:27,311 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:42:27,312 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 13:42:27,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 13:42:27,425 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 13:42:27,425 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:42:27,426 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 13:42:27,426 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 13:42:27,426 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 13:42:27,426 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:42:27,426 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_188a43f3-60dd-457b-9453-be20e5fa91ce/bin-2019/utaipan/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 13:42:27,434 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 13:42:27,434 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-18 13:42:27,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 13:42:27,453 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 13:42:27,467 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 13:42:27,467 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 13:42:27,596 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 13:42:27,620 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 13:42:27,620 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 23 [2018-11-18 13:42:27,621 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 13:42:27,621 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-11-18 13:42:27,621 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-11-18 13:42:27,621 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2018-11-18 13:42:27,622 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand 14 states. [2018-11-18 13:42:27,671 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 13:42:27,671 INFO L93 Difference]: Finished difference Result 68 states and 70 transitions. [2018-11-18 13:42:27,671 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-11-18 13:42:27,672 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 50 [2018-11-18 13:42:27,672 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 13:42:27,672 INFO L225 Difference]: With dead ends: 68 [2018-11-18 13:42:27,672 INFO L226 Difference]: Without dead ends: 55 [2018-11-18 13:42:27,673 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 89 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 59 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2018-11-18 13:42:27,673 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2018-11-18 13:42:27,676 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 54. [2018-11-18 13:42:27,676 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2018-11-18 13:42:27,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 55 transitions. [2018-11-18 13:42:27,676 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 55 transitions. Word has length 50 [2018-11-18 13:42:27,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 13:42:27,677 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 55 transitions. [2018-11-18 13:42:27,677 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-11-18 13:42:27,677 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 55 transitions. [2018-11-18 13:42:27,678 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-11-18 13:42:27,679 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 13:42:27,679 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 13:42:27,679 INFO L423 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 13:42:27,679 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 13:42:27,679 INFO L82 PathProgramCache]: Analyzing trace with hash 756224115, now seen corresponding path program 11 times [2018-11-18 13:42:27,679 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 13:42:27,682 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:42:27,682 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 13:42:27,682 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:42:27,682 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 13:42:27,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 13:42:27,769 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 13:42:27,769 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:42:27,770 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 13:42:27,770 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 13:42:27,770 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 13:42:27,770 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:42:27,770 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_188a43f3-60dd-457b-9453-be20e5fa91ce/bin-2019/utaipan/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 13:42:27,787 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-18 13:42:27,787 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-18 13:42:28,151 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-11-18 13:42:28,151 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 13:42:28,154 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 13:42:28,169 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 13:42:28,169 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 13:42:28,274 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 13:42:28,290 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 13:42:28,290 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 23 [2018-11-18 13:42:28,290 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 13:42:28,291 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-11-18 13:42:28,291 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-11-18 13:42:28,291 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2018-11-18 13:42:28,291 INFO L87 Difference]: Start difference. First operand 54 states and 55 transitions. Second operand 15 states. [2018-11-18 13:42:28,316 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 13:42:28,316 INFO L93 Difference]: Finished difference Result 71 states and 73 transitions. [2018-11-18 13:42:28,317 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-11-18 13:42:28,317 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 53 [2018-11-18 13:42:28,317 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 13:42:28,317 INFO L225 Difference]: With dead ends: 71 [2018-11-18 13:42:28,317 INFO L226 Difference]: Without dead ends: 58 [2018-11-18 13:42:28,318 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 94 SyntacticMatches, 4 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 82 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2018-11-18 13:42:28,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2018-11-18 13:42:28,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2018-11-18 13:42:28,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-11-18 13:42:28,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 58 transitions. [2018-11-18 13:42:28,322 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 58 transitions. Word has length 53 [2018-11-18 13:42:28,323 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 13:42:28,323 INFO L480 AbstractCegarLoop]: Abstraction has 57 states and 58 transitions. [2018-11-18 13:42:28,323 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-11-18 13:42:28,323 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 58 transitions. [2018-11-18 13:42:28,324 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2018-11-18 13:42:28,324 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 13:42:28,324 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 13:42:28,324 INFO L423 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 13:42:28,324 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 13:42:28,324 INFO L82 PathProgramCache]: Analyzing trace with hash 1502304420, now seen corresponding path program 12 times [2018-11-18 13:42:28,325 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 13:42:28,327 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:42:28,327 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 13:42:28,327 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:42:28,327 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 13:42:28,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 13:42:28,427 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 13:42:28,428 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:42:28,428 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 13:42:28,428 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 13:42:28,428 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 13:42:28,428 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:42:28,428 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_188a43f3-60dd-457b-9453-be20e5fa91ce/bin-2019/utaipan/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 13:42:28,435 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-18 13:42:28,435 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-18 13:42:28,454 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-18 13:42:28,454 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 13:42:28,457 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 13:42:28,469 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 13:42:28,469 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 13:42:28,578 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 13:42:28,594 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 13:42:28,594 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 23 [2018-11-18 13:42:28,595 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 13:42:28,595 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-11-18 13:42:28,595 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-11-18 13:42:28,595 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2018-11-18 13:42:28,595 INFO L87 Difference]: Start difference. First operand 57 states and 58 transitions. Second operand 16 states. [2018-11-18 13:42:28,624 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 13:42:28,624 INFO L93 Difference]: Finished difference Result 74 states and 76 transitions. [2018-11-18 13:42:28,624 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-11-18 13:42:28,624 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 56 [2018-11-18 13:42:28,624 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 13:42:28,624 INFO L225 Difference]: With dead ends: 74 [2018-11-18 13:42:28,624 INFO L226 Difference]: Without dead ends: 61 [2018-11-18 13:42:28,625 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 99 SyntacticMatches, 6 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 105 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2018-11-18 13:42:28,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-11-18 13:42:28,627 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 60. [2018-11-18 13:42:28,627 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2018-11-18 13:42:28,627 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2018-11-18 13:42:28,627 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 56 [2018-11-18 13:42:28,627 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 13:42:28,628 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2018-11-18 13:42:28,628 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-11-18 13:42:28,628 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2018-11-18 13:42:28,628 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2018-11-18 13:42:28,628 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 13:42:28,628 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 13:42:28,628 INFO L423 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 13:42:28,628 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 13:42:28,628 INFO L82 PathProgramCache]: Analyzing trace with hash 1524913875, now seen corresponding path program 13 times [2018-11-18 13:42:28,629 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 13:42:28,629 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:42:28,629 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 13:42:28,629 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:42:28,629 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 13:42:28,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 13:42:28,741 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 13:42:28,741 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:42:28,742 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 13:42:28,742 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 13:42:28,742 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 13:42:28,742 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:42:28,742 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_188a43f3-60dd-457b-9453-be20e5fa91ce/bin-2019/utaipan/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 13:42:28,749 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 13:42:28,750 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-18 13:42:28,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 13:42:28,773 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 13:42:28,789 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 13:42:28,789 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 13:42:28,917 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 13:42:28,933 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 13:42:28,934 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 23 [2018-11-18 13:42:28,934 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 13:42:28,934 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-11-18 13:42:28,934 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-11-18 13:42:28,934 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2018-11-18 13:42:28,935 INFO L87 Difference]: Start difference. First operand 60 states and 61 transitions. Second operand 17 states. [2018-11-18 13:42:28,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 13:42:28,969 INFO L93 Difference]: Finished difference Result 77 states and 79 transitions. [2018-11-18 13:42:28,969 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-11-18 13:42:28,969 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 59 [2018-11-18 13:42:28,970 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 13:42:28,970 INFO L225 Difference]: With dead ends: 77 [2018-11-18 13:42:28,970 INFO L226 Difference]: Without dead ends: 64 [2018-11-18 13:42:28,971 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 104 SyntacticMatches, 8 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 128 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2018-11-18 13:42:28,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2018-11-18 13:42:28,973 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2018-11-18 13:42:28,973 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-11-18 13:42:28,973 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 64 transitions. [2018-11-18 13:42:28,974 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 64 transitions. Word has length 59 [2018-11-18 13:42:28,974 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 13:42:28,974 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 64 transitions. [2018-11-18 13:42:28,974 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-11-18 13:42:28,974 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 64 transitions. [2018-11-18 13:42:28,975 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2018-11-18 13:42:28,975 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 13:42:28,975 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 13:42:28,975 INFO L423 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 13:42:28,975 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 13:42:28,975 INFO L82 PathProgramCache]: Analyzing trace with hash 773322308, now seen corresponding path program 14 times [2018-11-18 13:42:28,975 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 13:42:28,976 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:42:28,976 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 13:42:28,976 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:42:28,976 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 13:42:28,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 13:42:29,085 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 13:42:29,085 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:42:29,085 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 13:42:29,086 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 13:42:29,086 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 13:42:29,086 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:42:29,086 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_188a43f3-60dd-457b-9453-be20e5fa91ce/bin-2019/utaipan/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 13:42:29,093 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-18 13:42:29,093 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-18 13:42:30,202 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-11-18 13:42:30,202 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 13:42:30,206 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 13:42:30,224 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 13:42:30,224 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 13:42:30,354 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 13:42:30,371 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 13:42:30,371 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 23 [2018-11-18 13:42:30,371 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 13:42:30,371 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-11-18 13:42:30,372 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-11-18 13:42:30,372 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2018-11-18 13:42:30,372 INFO L87 Difference]: Start difference. First operand 63 states and 64 transitions. Second operand 18 states. [2018-11-18 13:42:30,407 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 13:42:30,407 INFO L93 Difference]: Finished difference Result 80 states and 82 transitions. [2018-11-18 13:42:30,408 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-11-18 13:42:30,408 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 62 [2018-11-18 13:42:30,408 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 13:42:30,409 INFO L225 Difference]: With dead ends: 80 [2018-11-18 13:42:30,409 INFO L226 Difference]: Without dead ends: 67 [2018-11-18 13:42:30,409 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 109 SyntacticMatches, 10 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 151 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2018-11-18 13:42:30,409 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2018-11-18 13:42:30,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 66. [2018-11-18 13:42:30,415 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2018-11-18 13:42:30,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 67 transitions. [2018-11-18 13:42:30,415 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 67 transitions. Word has length 62 [2018-11-18 13:42:30,416 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 13:42:30,416 INFO L480 AbstractCegarLoop]: Abstraction has 66 states and 67 transitions. [2018-11-18 13:42:30,416 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-11-18 13:42:30,416 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 67 transitions. [2018-11-18 13:42:30,416 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2018-11-18 13:42:30,416 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 13:42:30,417 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 13:42:30,417 INFO L423 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 13:42:30,417 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 13:42:30,417 INFO L82 PathProgramCache]: Analyzing trace with hash -226536141, now seen corresponding path program 15 times [2018-11-18 13:42:30,417 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 13:42:30,418 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:42:30,418 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 13:42:30,418 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:42:30,418 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 13:42:30,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 13:42:30,526 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 13:42:30,526 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:42:30,526 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 13:42:30,526 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 13:42:30,527 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 13:42:30,527 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:42:30,527 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_188a43f3-60dd-457b-9453-be20e5fa91ce/bin-2019/utaipan/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 13:42:30,533 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-18 13:42:30,534 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-18 13:42:30,552 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-18 13:42:30,552 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 13:42:30,553 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 13:42:30,563 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 13:42:30,564 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 13:42:30,731 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 13:42:30,747 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 13:42:30,747 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 23 [2018-11-18 13:42:30,747 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 13:42:30,747 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-11-18 13:42:30,747 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-11-18 13:42:30,747 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2018-11-18 13:42:30,748 INFO L87 Difference]: Start difference. First operand 66 states and 67 transitions. Second operand 19 states. [2018-11-18 13:42:30,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 13:42:30,783 INFO L93 Difference]: Finished difference Result 83 states and 85 transitions. [2018-11-18 13:42:30,783 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-11-18 13:42:30,783 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 65 [2018-11-18 13:42:30,783 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 13:42:30,783 INFO L225 Difference]: With dead ends: 83 [2018-11-18 13:42:30,783 INFO L226 Difference]: Without dead ends: 70 [2018-11-18 13:42:30,784 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 114 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 174 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2018-11-18 13:42:30,784 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2018-11-18 13:42:30,786 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2018-11-18 13:42:30,786 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2018-11-18 13:42:30,786 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 70 transitions. [2018-11-18 13:42:30,787 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 70 transitions. Word has length 65 [2018-11-18 13:42:30,787 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 13:42:30,787 INFO L480 AbstractCegarLoop]: Abstraction has 69 states and 70 transitions. [2018-11-18 13:42:30,787 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-11-18 13:42:30,787 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 70 transitions. [2018-11-18 13:42:30,788 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2018-11-18 13:42:30,788 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 13:42:30,788 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 13:42:30,788 INFO L423 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 13:42:30,788 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 13:42:30,788 INFO L82 PathProgramCache]: Analyzing trace with hash -1411392540, now seen corresponding path program 16 times [2018-11-18 13:42:30,788 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 13:42:30,789 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:42:30,789 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 13:42:30,789 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:42:30,789 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 13:42:30,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 13:42:30,905 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 13:42:30,905 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:42:30,905 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 13:42:30,906 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 13:42:30,906 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 13:42:30,906 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:42:30,906 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_188a43f3-60dd-457b-9453-be20e5fa91ce/bin-2019/utaipan/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 13:42:30,921 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 13:42:30,922 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-18 13:42:30,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 13:42:30,941 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 13:42:30,953 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 13:42:30,954 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 13:42:31,080 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 13:42:31,095 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 13:42:31,095 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 23 [2018-11-18 13:42:31,095 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 13:42:31,096 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-11-18 13:42:31,096 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-11-18 13:42:31,096 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2018-11-18 13:42:31,096 INFO L87 Difference]: Start difference. First operand 69 states and 70 transitions. Second operand 20 states. [2018-11-18 13:42:31,126 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 13:42:31,127 INFO L93 Difference]: Finished difference Result 86 states and 88 transitions. [2018-11-18 13:42:31,127 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-11-18 13:42:31,127 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 68 [2018-11-18 13:42:31,127 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 13:42:31,127 INFO L225 Difference]: With dead ends: 86 [2018-11-18 13:42:31,128 INFO L226 Difference]: Without dead ends: 73 [2018-11-18 13:42:31,128 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 119 SyntacticMatches, 14 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 197 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2018-11-18 13:42:31,128 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2018-11-18 13:42:31,129 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 72. [2018-11-18 13:42:31,129 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2018-11-18 13:42:31,130 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 73 transitions. [2018-11-18 13:42:31,130 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 73 transitions. Word has length 68 [2018-11-18 13:42:31,130 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 13:42:31,130 INFO L480 AbstractCegarLoop]: Abstraction has 72 states and 73 transitions. [2018-11-18 13:42:31,130 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-11-18 13:42:31,130 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 73 transitions. [2018-11-18 13:42:31,131 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2018-11-18 13:42:31,131 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 13:42:31,131 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 13:42:31,131 INFO L423 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 13:42:31,132 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 13:42:31,132 INFO L82 PathProgramCache]: Analyzing trace with hash 867830675, now seen corresponding path program 17 times [2018-11-18 13:42:31,132 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 13:42:31,132 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:42:31,132 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 13:42:31,132 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:42:31,133 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 13:42:31,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 13:42:31,266 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 13:42:31,266 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:42:31,266 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 13:42:31,266 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 13:42:31,266 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 13:42:31,266 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:42:31,266 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_188a43f3-60dd-457b-9453-be20e5fa91ce/bin-2019/utaipan/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 13:42:31,284 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-18 13:42:31,284 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-18 13:42:34,760 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2018-11-18 13:42:34,760 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 13:42:34,767 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 13:42:34,776 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 13:42:34,776 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 13:42:34,886 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 13:42:34,903 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 13:42:34,904 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 23 [2018-11-18 13:42:34,904 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 13:42:34,904 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-11-18 13:42:34,904 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-11-18 13:42:34,904 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2018-11-18 13:42:34,905 INFO L87 Difference]: Start difference. First operand 72 states and 73 transitions. Second operand 21 states. [2018-11-18 13:42:34,938 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 13:42:34,938 INFO L93 Difference]: Finished difference Result 89 states and 91 transitions. [2018-11-18 13:42:34,938 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-11-18 13:42:34,938 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 71 [2018-11-18 13:42:34,939 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 13:42:34,939 INFO L225 Difference]: With dead ends: 89 [2018-11-18 13:42:34,939 INFO L226 Difference]: Without dead ends: 76 [2018-11-18 13:42:34,939 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 124 SyntacticMatches, 16 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2018-11-18 13:42:34,939 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2018-11-18 13:42:34,940 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2018-11-18 13:42:34,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2018-11-18 13:42:34,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 76 transitions. [2018-11-18 13:42:34,941 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 76 transitions. Word has length 71 [2018-11-18 13:42:34,941 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 13:42:34,941 INFO L480 AbstractCegarLoop]: Abstraction has 75 states and 76 transitions. [2018-11-18 13:42:34,941 INFO L481 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-11-18 13:42:34,941 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 76 transitions. [2018-11-18 13:42:34,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2018-11-18 13:42:34,942 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 13:42:34,942 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 13:42:34,942 INFO L423 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 13:42:34,942 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 13:42:34,942 INFO L82 PathProgramCache]: Analyzing trace with hash 2068646276, now seen corresponding path program 18 times [2018-11-18 13:42:34,942 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 13:42:34,943 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:42:34,943 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 13:42:34,943 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:42:34,943 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 13:42:34,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 13:42:35,082 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 13:42:35,082 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:42:35,082 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 13:42:35,083 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 13:42:35,083 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 13:42:35,083 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:42:35,083 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_188a43f3-60dd-457b-9453-be20e5fa91ce/bin-2019/utaipan/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 13:42:35,095 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-18 13:42:35,095 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-18 13:42:35,124 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-18 13:42:35,125 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 13:42:35,126 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 13:42:35,135 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 13:42:35,135 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 13:42:35,279 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 13:42:35,295 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 13:42:35,295 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 23 [2018-11-18 13:42:35,295 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 13:42:35,295 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-11-18 13:42:35,296 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-11-18 13:42:35,296 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2018-11-18 13:42:35,296 INFO L87 Difference]: Start difference. First operand 75 states and 76 transitions. Second operand 22 states. [2018-11-18 13:42:35,333 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 13:42:35,333 INFO L93 Difference]: Finished difference Result 92 states and 94 transitions. [2018-11-18 13:42:35,334 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-11-18 13:42:35,334 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 74 [2018-11-18 13:42:35,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 13:42:35,335 INFO L225 Difference]: With dead ends: 92 [2018-11-18 13:42:35,335 INFO L226 Difference]: Without dead ends: 79 [2018-11-18 13:42:35,335 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 129 SyntacticMatches, 18 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 242 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2018-11-18 13:42:35,335 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2018-11-18 13:42:35,336 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 78. [2018-11-18 13:42:35,336 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2018-11-18 13:42:35,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 79 transitions. [2018-11-18 13:42:35,337 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 79 transitions. Word has length 74 [2018-11-18 13:42:35,337 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 13:42:35,337 INFO L480 AbstractCegarLoop]: Abstraction has 78 states and 79 transitions. [2018-11-18 13:42:35,337 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-11-18 13:42:35,337 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 79 transitions. [2018-11-18 13:42:35,338 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2018-11-18 13:42:35,338 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 13:42:35,338 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 13:42:35,338 INFO L423 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 13:42:35,338 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 13:42:35,338 INFO L82 PathProgramCache]: Analyzing trace with hash -1511360013, now seen corresponding path program 19 times [2018-11-18 13:42:35,339 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 13:42:35,339 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:42:35,339 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 13:42:35,339 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:42:35,339 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 13:42:35,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 13:42:35,488 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 13:42:35,488 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:42:35,488 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 13:42:35,488 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 13:42:35,488 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 13:42:35,489 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:42:35,489 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_188a43f3-60dd-457b-9453-be20e5fa91ce/bin-2019/utaipan/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 13:42:35,497 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 13:42:35,497 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-18 13:42:35,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 13:42:35,522 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 13:42:35,547 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 13:42:35,547 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 13:42:35,673 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 13:42:35,688 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 13:42:35,688 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 23 [2018-11-18 13:42:35,688 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 13:42:35,689 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-11-18 13:42:35,689 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-11-18 13:42:35,689 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2018-11-18 13:42:35,689 INFO L87 Difference]: Start difference. First operand 78 states and 79 transitions. Second operand 23 states. [2018-11-18 13:42:35,727 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 13:42:35,727 INFO L93 Difference]: Finished difference Result 94 states and 96 transitions. [2018-11-18 13:42:35,727 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-11-18 13:42:35,727 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 77 [2018-11-18 13:42:35,728 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 13:42:35,728 INFO L225 Difference]: With dead ends: 94 [2018-11-18 13:42:35,728 INFO L226 Difference]: Without dead ends: 81 [2018-11-18 13:42:35,728 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 134 SyntacticMatches, 20 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 280 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2018-11-18 13:42:35,729 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2018-11-18 13:42:35,730 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 81. [2018-11-18 13:42:35,730 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2018-11-18 13:42:35,730 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 82 transitions. [2018-11-18 13:42:35,730 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 82 transitions. Word has length 77 [2018-11-18 13:42:35,730 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 13:42:35,730 INFO L480 AbstractCegarLoop]: Abstraction has 81 states and 82 transitions. [2018-11-18 13:42:35,730 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-11-18 13:42:35,730 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 82 transitions. [2018-11-18 13:42:35,731 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2018-11-18 13:42:35,731 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 13:42:35,731 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 13:42:35,731 INFO L423 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 13:42:35,731 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 13:42:35,731 INFO L82 PathProgramCache]: Analyzing trace with hash -850821340, now seen corresponding path program 20 times [2018-11-18 13:42:35,731 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 13:42:35,732 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:42:35,732 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 13:42:35,732 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:42:35,732 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 13:42:35,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-11-18 13:42:35,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-11-18 13:42:35,806 INFO L442 BasicCegarLoop]: Counterexample might be feasible [2018-11-18 13:42:35,838 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 18.11 01:42:35 BoogieIcfgContainer [2018-11-18 13:42:35,839 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-11-18 13:42:35,839 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2018-11-18 13:42:35,839 INFO L271 PluginConnector]: Initializing Witness Printer... [2018-11-18 13:42:35,839 INFO L276 PluginConnector]: Witness Printer initialized [2018-11-18 13:42:35,840 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.11 01:42:24" (3/4) ... [2018-11-18 13:42:35,844 INFO L138 WitnessPrinter]: Generating witness for reachability counterexample [2018-11-18 13:42:35,910 INFO L145 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/working_dir_188a43f3-60dd-457b-9453-be20e5fa91ce/bin-2019/utaipan/witness.graphml [2018-11-18 13:42:35,910 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2018-11-18 13:42:35,911 INFO L168 Benchmark]: Toolchain (without parser) took 11828.33 ms. Allocated memory was 1.0 GB in the beginning and 1.4 GB in the end (delta: 364.9 MB). Free memory was 959.1 MB in the beginning and 1.4 GB in the end (delta: -400.6 MB). Peak memory consumption was 433.2 MB. Max. memory is 11.5 GB. [2018-11-18 13:42:35,913 INFO L168 Benchmark]: CDTParser took 0.18 ms. Allocated memory is still 1.0 GB. Free memory is still 985.4 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-11-18 13:42:35,913 INFO L168 Benchmark]: CACSL2BoogieTranslator took 172.81 ms. Allocated memory is still 1.0 GB. Free memory was 959.1 MB in the beginning and 948.4 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. [2018-11-18 13:42:35,913 INFO L168 Benchmark]: Boogie Procedure Inliner took 14.91 ms. Allocated memory is still 1.0 GB. Free memory was 948.4 MB in the beginning and 945.7 MB in the end (delta: 2.7 MB). Peak memory consumption was 2.7 MB. Max. memory is 11.5 GB. [2018-11-18 13:42:35,913 INFO L168 Benchmark]: Boogie Preprocessor took 54.61 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 162.5 MB). Free memory was 945.7 MB in the beginning and 1.2 GB in the end (delta: -214.8 MB). Peak memory consumption was 14.6 MB. Max. memory is 11.5 GB. [2018-11-18 13:42:35,914 INFO L168 Benchmark]: RCFGBuilder took 173.38 ms. Allocated memory is still 1.2 GB. Free memory was 1.2 GB in the beginning and 1.1 GB in the end (delta: 18.0 MB). Peak memory consumption was 18.0 MB. Max. memory is 11.5 GB. [2018-11-18 13:42:35,914 INFO L168 Benchmark]: TraceAbstraction took 11338.39 ms. Allocated memory was 1.2 GB in the beginning and 1.4 GB in the end (delta: 172.5 MB). Free memory was 1.1 GB in the beginning and 861.0 MB in the end (delta: 281.5 MB). Peak memory consumption was 454.0 MB. Max. memory is 11.5 GB. [2018-11-18 13:42:35,914 INFO L168 Benchmark]: Witness Printer took 71.09 ms. Allocated memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 29.9 MB). Free memory was 861.0 MB in the beginning and 1.4 GB in the end (delta: -498.7 MB). Peak memory consumption was 8.2 kB. Max. memory is 11.5 GB. [2018-11-18 13:42:35,916 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.18 ms. Allocated memory is still 1.0 GB. Free memory is still 985.4 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 172.81 ms. Allocated memory is still 1.0 GB. Free memory was 959.1 MB in the beginning and 948.4 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. * Boogie Procedure Inliner took 14.91 ms. Allocated memory is still 1.0 GB. Free memory was 948.4 MB in the beginning and 945.7 MB in the end (delta: 2.7 MB). Peak memory consumption was 2.7 MB. Max. memory is 11.5 GB. * Boogie Preprocessor took 54.61 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 162.5 MB). Free memory was 945.7 MB in the beginning and 1.2 GB in the end (delta: -214.8 MB). Peak memory consumption was 14.6 MB. Max. memory is 11.5 GB. * RCFGBuilder took 173.38 ms. Allocated memory is still 1.2 GB. Free memory was 1.2 GB in the beginning and 1.1 GB in the end (delta: 18.0 MB). Peak memory consumption was 18.0 MB. Max. memory is 11.5 GB. * TraceAbstraction took 11338.39 ms. Allocated memory was 1.2 GB in the beginning and 1.4 GB in the end (delta: 172.5 MB). Free memory was 1.1 GB in the beginning and 861.0 MB in the end (delta: 281.5 MB). Peak memory consumption was 454.0 MB. Max. memory is 11.5 GB. * Witness Printer took 71.09 ms. Allocated memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 29.9 MB). Free memory was 861.0 MB in the beginning and 1.4 GB in the end (delta: -498.7 MB). Peak memory consumption was 8.2 kB. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 37]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L15] FCALL struct dummy ad1[20], *ad2; [L16] int i, j, *pa; [L17] j=0 VAL [ad1={161:0}, j=0] [L17] COND TRUE j<20 [L18] FCALL ad1[j].a = __VERIFIER_nondet_int() [L19] FCALL ad1[j].b = __VERIFIER_nondet_int() [L17] j++ VAL [ad1={161:0}, j=1] [L17] COND TRUE j<20 [L18] FCALL ad1[j].a = __VERIFIER_nondet_int() [L19] FCALL ad1[j].b = __VERIFIER_nondet_int() [L17] j++ VAL [ad1={161:0}, j=2] [L17] COND TRUE j<20 [L18] FCALL ad1[j].a = __VERIFIER_nondet_int() [L19] FCALL ad1[j].b = __VERIFIER_nondet_int() [L17] j++ VAL [ad1={161:0}, j=3] [L17] COND TRUE j<20 [L18] FCALL ad1[j].a = __VERIFIER_nondet_int() [L19] FCALL ad1[j].b = __VERIFIER_nondet_int() [L17] j++ VAL [ad1={161:0}, j=4] [L17] COND TRUE j<20 [L18] FCALL ad1[j].a = __VERIFIER_nondet_int() [L19] FCALL ad1[j].b = __VERIFIER_nondet_int() [L17] j++ VAL [ad1={161:0}, j=5] [L17] COND TRUE j<20 [L18] FCALL ad1[j].a = __VERIFIER_nondet_int() [L19] FCALL ad1[j].b = __VERIFIER_nondet_int() [L17] j++ VAL [ad1={161:0}, j=6] [L17] COND TRUE j<20 [L18] FCALL ad1[j].a = __VERIFIER_nondet_int() [L19] FCALL ad1[j].b = __VERIFIER_nondet_int() [L17] j++ VAL [ad1={161:0}, j=7] [L17] COND TRUE j<20 [L18] FCALL ad1[j].a = __VERIFIER_nondet_int() [L19] FCALL ad1[j].b = __VERIFIER_nondet_int() [L17] j++ VAL [ad1={161:0}, j=8] [L17] COND TRUE j<20 [L18] FCALL ad1[j].a = __VERIFIER_nondet_int() [L19] FCALL ad1[j].b = __VERIFIER_nondet_int() [L17] j++ VAL [ad1={161:0}, j=9] [L17] COND TRUE j<20 [L18] FCALL ad1[j].a = __VERIFIER_nondet_int() [L19] FCALL ad1[j].b = __VERIFIER_nondet_int() [L17] j++ VAL [ad1={161:0}, j=10] [L17] COND TRUE j<20 [L18] FCALL ad1[j].a = __VERIFIER_nondet_int() [L19] FCALL ad1[j].b = __VERIFIER_nondet_int() [L17] j++ VAL [ad1={161:0}, j=11] [L17] COND TRUE j<20 [L18] FCALL ad1[j].a = __VERIFIER_nondet_int() [L19] FCALL ad1[j].b = __VERIFIER_nondet_int() [L17] j++ VAL [ad1={161:0}, j=12] [L17] COND TRUE j<20 [L18] FCALL ad1[j].a = __VERIFIER_nondet_int() [L19] FCALL ad1[j].b = __VERIFIER_nondet_int() [L17] j++ VAL [ad1={161:0}, j=13] [L17] COND TRUE j<20 [L18] FCALL ad1[j].a = __VERIFIER_nondet_int() [L19] FCALL ad1[j].b = __VERIFIER_nondet_int() [L17] j++ VAL [ad1={161:0}, j=14] [L17] COND TRUE j<20 [L18] FCALL ad1[j].a = __VERIFIER_nondet_int() [L19] FCALL ad1[j].b = __VERIFIER_nondet_int() [L17] j++ VAL [ad1={161:0}, j=15] [L17] COND TRUE j<20 [L18] FCALL ad1[j].a = __VERIFIER_nondet_int() [L19] FCALL ad1[j].b = __VERIFIER_nondet_int() [L17] j++ VAL [ad1={161:0}, j=16] [L17] COND TRUE j<20 [L18] FCALL ad1[j].a = __VERIFIER_nondet_int() [L19] FCALL ad1[j].b = __VERIFIER_nondet_int() [L17] j++ VAL [ad1={161:0}, j=17] [L17] COND TRUE j<20 [L18] FCALL ad1[j].a = __VERIFIER_nondet_int() [L19] FCALL ad1[j].b = __VERIFIER_nondet_int() [L17] j++ VAL [ad1={161:0}, j=18] [L17] COND TRUE j<20 [L18] FCALL ad1[j].a = __VERIFIER_nondet_int() [L19] FCALL ad1[j].b = __VERIFIER_nondet_int() [L17] j++ VAL [ad1={161:0}, j=19] [L17] COND TRUE j<20 [L18] FCALL ad1[j].a = __VERIFIER_nondet_int() [L19] FCALL ad1[j].b = __VERIFIER_nondet_int() [L17] j++ VAL [ad1={161:0}, j=20] [L17] COND FALSE !(j<20) VAL [ad1={161:0}, j=20] [L21] i = __VERIFIER_nondet_int() [L22] COND TRUE i >= 0 && i < 10 [L23] ad2 = ad1 [L24] FCALL ad1[i].a = i [L25] pa = &ad1[i].a [L26] EXPR, FCALL ad2[i].a [L26] i = ad2[i].a + 10 [L27] EXPR, FCALL \read(*pa) VAL [\read(*pa)=0, ad1={161:0}, ad2={161:0}, i=10, j=20, pa={161:0}] [L27] COND FALSE !(i < *pa) [L30] CALL, EXPR check(ad1, i) VAL [\old(b)=10, ad1={161:0}] [L10] EXPR, FCALL ad1[b].a [L10] RET return ad1[b].a == b; [L30] EXPR check(ad1, i) VAL [ad1={161:0}, ad2={161:0}, check(ad1, i)=0, i=10, j=20, pa={161:0}] [L30] COND TRUE !check(ad1, i) [L37] __VERIFIER_error() VAL [ad1={161:0}, ad2={161:0}, i=10, j=20, pa={161:0}] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 27 locations, 1 error locations. UNSAFE Result, 11.2s OverallTime, 22 OverallIterations, 21 TraceHistogramMax, 0.6s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 449 SDtfs, 210 SDslu, 2616 SDs, 0 SdLazy, 616 SolverSat, 29 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.4s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 2133 GetRequests, 1695 SyntacticMatches, 110 SemanticMatches, 328 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1818 ImplicationChecksByTransitivity, 3.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=81occurred in iteration=21, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.1s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 21 MinimizatonAttempts, 19 StatesRemovedByMinimization, 19 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.1s SsaConstructionTime, 5.4s SatisfiabilityAnalysisTime, 3.9s InterpolantComputationTime, 2017 NumberOfCodeBlocks, 2017 NumberOfCodeBlocksAsserted, 104 NumberOfCheckSat, 2828 ConstructedInterpolants, 0 QuantifiedInterpolants, 362472 SizeOfPredicates, 19 NumberOfNonLiveVariables, 3287 ConjunctsInSsa, 228 ConjunctsInUnsatCore, 59 InterpolantComputations, 2 PerfectInterpolantSequences, 0/11400 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...