./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/list-ext2-properties/list_and_tree_cnstr-1.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version f470102c Calling Ultimate with: /usr/lib/jvm/java-8-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_aaccbcb2-9f26-4163-9ddd-6672402163fc/bin/utaipan/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/run_dir_aaccbcb2-9f26-4163-9ddd-6672402163fc/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_aaccbcb2-9f26-4163-9ddd-6672402163fc/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_aaccbcb2-9f26-4163-9ddd-6672402163fc/bin/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/list-ext2-properties/list_and_tree_cnstr-1.i -s /tmp/vcloud-vcloud-master/worker/run_dir_aaccbcb2-9f26-4163-9ddd-6672402163fc/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_aaccbcb2-9f26-4163-9ddd-6672402163fc/bin/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 eed6d14b3659ee573ecc9a025ea4a6cd48efa35c ...................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... 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 0.1.25-f470102 [2019-12-07 13:14:12,959 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-12-07 13:14:12,960 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-12-07 13:14:12,968 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-12-07 13:14:12,968 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-12-07 13:14:12,969 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-12-07 13:14:12,970 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-12-07 13:14:12,971 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-12-07 13:14:12,972 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-12-07 13:14:12,973 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-12-07 13:14:12,973 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-12-07 13:14:12,974 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-12-07 13:14:12,974 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-12-07 13:14:12,975 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-12-07 13:14:12,976 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-12-07 13:14:12,976 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-12-07 13:14:12,977 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-12-07 13:14:12,978 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-12-07 13:14:12,979 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-12-07 13:14:12,980 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-12-07 13:14:12,982 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-12-07 13:14:12,982 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-12-07 13:14:12,983 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-12-07 13:14:12,983 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-12-07 13:14:12,985 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-12-07 13:14:12,985 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-12-07 13:14:12,985 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-12-07 13:14:12,986 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-12-07 13:14:12,986 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-12-07 13:14:12,987 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-12-07 13:14:12,987 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-12-07 13:14:12,987 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-12-07 13:14:12,988 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-12-07 13:14:12,988 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-12-07 13:14:12,989 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-12-07 13:14:12,989 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-12-07 13:14:12,989 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-12-07 13:14:12,989 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-12-07 13:14:12,989 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-12-07 13:14:12,990 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-12-07 13:14:12,990 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-12-07 13:14:12,991 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_aaccbcb2-9f26-4163-9ddd-6672402163fc/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2019-12-07 13:14:13,001 INFO L113 SettingsManager]: Loading preferences was successful [2019-12-07 13:14:13,001 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-12-07 13:14:13,001 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-12-07 13:14:13,002 INFO L138 SettingsManager]: * User list type=DISABLED [2019-12-07 13:14:13,002 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-12-07 13:14:13,002 INFO L138 SettingsManager]: * Explicit value domain=true [2019-12-07 13:14:13,002 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2019-12-07 13:14:13,002 INFO L138 SettingsManager]: * Octagon Domain=false [2019-12-07 13:14:13,002 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2019-12-07 13:14:13,002 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2019-12-07 13:14:13,003 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2019-12-07 13:14:13,003 INFO L138 SettingsManager]: * Interval Domain=false [2019-12-07 13:14:13,003 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2019-12-07 13:14:13,003 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2019-12-07 13:14:13,003 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2019-12-07 13:14:13,003 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-12-07 13:14:13,004 INFO L138 SettingsManager]: * sizeof long=4 [2019-12-07 13:14:13,004 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-12-07 13:14:13,004 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-12-07 13:14:13,004 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-12-07 13:14:13,004 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-12-07 13:14:13,004 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-12-07 13:14:13,004 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-12-07 13:14:13,004 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2019-12-07 13:14:13,005 INFO L138 SettingsManager]: * sizeof long double=12 [2019-12-07 13:14:13,005 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-12-07 13:14:13,005 INFO L138 SettingsManager]: * Use constant arrays=true [2019-12-07 13:14:13,005 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-12-07 13:14:13,005 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-12-07 13:14:13,005 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-12-07 13:14:13,005 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-12-07 13:14:13,005 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-12-07 13:14:13,006 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-12-07 13:14:13,006 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-12-07 13:14:13,006 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-12-07 13:14:13,006 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2019-12-07 13:14:13,006 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-12-07 13:14:13,006 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-12-07 13:14:13,006 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2019-12-07 13:14:13,007 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-12-07 13:14:13,007 INFO L138 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/run_dir_aaccbcb2-9f26-4163-9ddd-6672402163fc/bin/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 -> eed6d14b3659ee573ecc9a025ea4a6cd48efa35c [2019-12-07 13:14:13,105 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-12-07 13:14:13,115 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-12-07 13:14:13,117 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-12-07 13:14:13,118 INFO L271 PluginConnector]: Initializing CDTParser... [2019-12-07 13:14:13,118 INFO L275 PluginConnector]: CDTParser initialized [2019-12-07 13:14:13,119 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_aaccbcb2-9f26-4163-9ddd-6672402163fc/bin/utaipan/../../sv-benchmarks/c/list-ext2-properties/list_and_tree_cnstr-1.i [2019-12-07 13:14:13,162 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_aaccbcb2-9f26-4163-9ddd-6672402163fc/bin/utaipan/data/bafcbe398/c12b8a591dd340c18c2cc95a5bfcd5b7/FLAG41b44ba4b [2019-12-07 13:14:13,603 INFO L306 CDTParser]: Found 1 translation units. [2019-12-07 13:14:13,604 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_aaccbcb2-9f26-4163-9ddd-6672402163fc/sv-benchmarks/c/list-ext2-properties/list_and_tree_cnstr-1.i [2019-12-07 13:14:13,613 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_aaccbcb2-9f26-4163-9ddd-6672402163fc/bin/utaipan/data/bafcbe398/c12b8a591dd340c18c2cc95a5bfcd5b7/FLAG41b44ba4b [2019-12-07 13:14:13,622 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_aaccbcb2-9f26-4163-9ddd-6672402163fc/bin/utaipan/data/bafcbe398/c12b8a591dd340c18c2cc95a5bfcd5b7 [2019-12-07 13:14:13,624 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-12-07 13:14:13,624 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2019-12-07 13:14:13,625 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-12-07 13:14:13,625 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-12-07 13:14:13,628 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-12-07 13:14:13,628 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.12 01:14:13" (1/1) ... [2019-12-07 13:14:13,630 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@21dd141f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 01:14:13, skipping insertion in model container [2019-12-07 13:14:13,630 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.12 01:14:13" (1/1) ... [2019-12-07 13:14:13,635 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2019-12-07 13:14:13,660 INFO L178 MainTranslator]: Built tables and reachable declarations [2019-12-07 13:14:13,882 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-12-07 13:14:13,888 INFO L203 MainTranslator]: Completed pre-run [2019-12-07 13:14:13,922 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-12-07 13:14:13,957 INFO L208 MainTranslator]: Completed translation [2019-12-07 13:14:13,958 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 01:14:13 WrapperNode [2019-12-07 13:14:13,958 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-12-07 13:14:13,958 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-12-07 13:14:13,959 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-12-07 13:14:13,959 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2019-12-07 13:14:13,965 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 01:14:13" (1/1) ... [2019-12-07 13:14:13,977 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 01:14:13" (1/1) ... [2019-12-07 13:14:13,995 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-12-07 13:14:13,996 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-12-07 13:14:13,996 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-12-07 13:14:13,996 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-12-07 13:14:14,002 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 01:14:13" (1/1) ... [2019-12-07 13:14:14,002 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 01:14:13" (1/1) ... [2019-12-07 13:14:14,005 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 01:14:13" (1/1) ... [2019-12-07 13:14:14,005 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 01:14:13" (1/1) ... [2019-12-07 13:14:14,012 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 01:14:13" (1/1) ... [2019-12-07 13:14:14,017 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 01:14:13" (1/1) ... [2019-12-07 13:14:14,019 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 01:14:13" (1/1) ... [2019-12-07 13:14:14,022 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-12-07 13:14:14,023 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-12-07 13:14:14,023 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-12-07 13:14:14,023 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-12-07 13:14:14,023 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 01:14:13" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_aaccbcb2-9f26-4163-9ddd-6672402163fc/bin/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 [2019-12-07 13:14:14,064 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-12-07 13:14:14,064 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-12-07 13:14:14,064 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2019-12-07 13:14:14,064 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2019-12-07 13:14:14,064 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2019-12-07 13:14:14,064 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-12-07 13:14:14,064 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-12-07 13:14:14,064 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-12-07 13:14:14,717 INFO L282 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-12-07 13:14:14,718 INFO L287 CfgBuilder]: Removed 18 assume(true) statements. [2019-12-07 13:14:14,718 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.12 01:14:14 BoogieIcfgContainer [2019-12-07 13:14:14,719 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-12-07 13:14:14,719 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-12-07 13:14:14,719 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-12-07 13:14:14,721 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-12-07 13:14:14,721 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.12 01:14:13" (1/3) ... [2019-12-07 13:14:14,722 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@d8d5bb6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.12 01:14:14, skipping insertion in model container [2019-12-07 13:14:14,722 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 01:14:13" (2/3) ... [2019-12-07 13:14:14,722 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@d8d5bb6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.12 01:14:14, skipping insertion in model container [2019-12-07 13:14:14,722 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.12 01:14:14" (3/3) ... [2019-12-07 13:14:14,723 INFO L109 eAbstractionObserver]: Analyzing ICFG list_and_tree_cnstr-1.i [2019-12-07 13:14:14,729 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-12-07 13:14:14,733 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-12-07 13:14:14,740 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-12-07 13:14:14,754 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-12-07 13:14:14,754 INFO L374 AbstractCegarLoop]: Hoare is true [2019-12-07 13:14:14,754 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-12-07 13:14:14,755 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-12-07 13:14:14,755 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-12-07 13:14:14,755 INFO L378 AbstractCegarLoop]: Difference is false [2019-12-07 13:14:14,755 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-12-07 13:14:14,755 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-12-07 13:14:14,764 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states. [2019-12-07 13:14:14,768 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-12-07 13:14:14,768 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 13:14:14,768 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-12-07 13:14:14,769 INFO L410 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-07 13:14:14,772 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 13:14:14,772 INFO L82 PathProgramCache]: Analyzing trace with hash 2079557203, now seen corresponding path program 1 times [2019-12-07 13:14:14,778 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-12-07 13:14:14,778 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [977688208] [2019-12-07 13:14:14,779 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 13:14:14,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 13:14:14,866 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 13:14:14,866 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [977688208] [2019-12-07 13:14:14,867 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-12-07 13:14:14,867 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-12-07 13:14:14,867 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1992606334] [2019-12-07 13:14:14,870 INFO L442 AbstractCegarLoop]: Interpolant automaton has 2 states [2019-12-07 13:14:14,870 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-12-07 13:14:14,879 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2019-12-07 13:14:14,879 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-12-07 13:14:14,881 INFO L87 Difference]: Start difference. First operand 32 states. Second operand 2 states. [2019-12-07 13:14:14,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 13:14:14,893 INFO L93 Difference]: Finished difference Result 63 states and 99 transitions. [2019-12-07 13:14:14,893 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2019-12-07 13:14:14,894 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 13 [2019-12-07 13:14:14,894 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 13:14:14,900 INFO L225 Difference]: With dead ends: 63 [2019-12-07 13:14:14,900 INFO L226 Difference]: Without dead ends: 27 [2019-12-07 13:14:14,902 INFO L630 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 [2019-12-07 13:14:14,913 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2019-12-07 13:14:14,922 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2019-12-07 13:14:14,922 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2019-12-07 13:14:14,923 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 34 transitions. [2019-12-07 13:14:14,924 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 34 transitions. Word has length 13 [2019-12-07 13:14:14,924 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 13:14:14,924 INFO L462 AbstractCegarLoop]: Abstraction has 27 states and 34 transitions. [2019-12-07 13:14:14,924 INFO L463 AbstractCegarLoop]: Interpolant automaton has 2 states. [2019-12-07 13:14:14,924 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 34 transitions. [2019-12-07 13:14:14,925 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2019-12-07 13:14:14,925 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 13:14:14,925 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-12-07 13:14:14,925 INFO L410 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-07 13:14:14,925 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 13:14:14,925 INFO L82 PathProgramCache]: Analyzing trace with hash 1860167109, now seen corresponding path program 1 times [2019-12-07 13:14:14,925 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-12-07 13:14:14,926 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1300264025] [2019-12-07 13:14:14,926 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 13:14:14,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 13:14:14,962 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 13:14:14,962 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1300264025] [2019-12-07 13:14:14,962 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-12-07 13:14:14,962 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-12-07 13:14:14,962 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1382661155] [2019-12-07 13:14:14,964 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-12-07 13:14:14,964 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-12-07 13:14:14,964 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-12-07 13:14:14,964 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-12-07 13:14:14,964 INFO L87 Difference]: Start difference. First operand 27 states and 34 transitions. Second operand 3 states. [2019-12-07 13:14:14,983 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 13:14:14,983 INFO L93 Difference]: Finished difference Result 47 states and 59 transitions. [2019-12-07 13:14:14,984 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-12-07 13:14:14,984 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 18 [2019-12-07 13:14:14,984 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 13:14:14,984 INFO L225 Difference]: With dead ends: 47 [2019-12-07 13:14:14,984 INFO L226 Difference]: Without dead ends: 31 [2019-12-07 13:14:14,985 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-12-07 13:14:14,985 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2019-12-07 13:14:14,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2019-12-07 13:14:14,988 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2019-12-07 13:14:14,989 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 35 transitions. [2019-12-07 13:14:14,989 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 35 transitions. Word has length 18 [2019-12-07 13:14:14,989 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 13:14:14,989 INFO L462 AbstractCegarLoop]: Abstraction has 28 states and 35 transitions. [2019-12-07 13:14:14,989 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-12-07 13:14:14,989 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 35 transitions. [2019-12-07 13:14:14,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2019-12-07 13:14:14,990 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 13:14:14,990 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-12-07 13:14:14,990 INFO L410 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-07 13:14:14,990 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 13:14:14,990 INFO L82 PathProgramCache]: Analyzing trace with hash -2056967314, now seen corresponding path program 1 times [2019-12-07 13:14:14,990 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-12-07 13:14:14,990 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2064012396] [2019-12-07 13:14:14,991 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 13:14:15,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 13:14:15,050 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-12-07 13:14:15,050 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2064012396] [2019-12-07 13:14:15,050 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-12-07 13:14:15,050 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-12-07 13:14:15,050 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [251359718] [2019-12-07 13:14:15,051 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-12-07 13:14:15,051 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-12-07 13:14:15,051 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-12-07 13:14:15,051 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-12-07 13:14:15,051 INFO L87 Difference]: Start difference. First operand 28 states and 35 transitions. Second operand 5 states. [2019-12-07 13:14:15,270 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 13:14:15,270 INFO L93 Difference]: Finished difference Result 51 states and 62 transitions. [2019-12-07 13:14:15,270 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-12-07 13:14:15,271 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 22 [2019-12-07 13:14:15,271 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 13:14:15,273 INFO L225 Difference]: With dead ends: 51 [2019-12-07 13:14:15,273 INFO L226 Difference]: Without dead ends: 47 [2019-12-07 13:14:15,274 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-12-07 13:14:15,274 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2019-12-07 13:14:15,278 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 37. [2019-12-07 13:14:15,279 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2019-12-07 13:14:15,279 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 47 transitions. [2019-12-07 13:14:15,280 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 47 transitions. Word has length 22 [2019-12-07 13:14:15,280 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 13:14:15,280 INFO L462 AbstractCegarLoop]: Abstraction has 37 states and 47 transitions. [2019-12-07 13:14:15,280 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-12-07 13:14:15,280 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 47 transitions. [2019-12-07 13:14:15,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2019-12-07 13:14:15,281 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 13:14:15,281 INFO L410 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, 1] [2019-12-07 13:14:15,281 INFO L410 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-07 13:14:15,282 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 13:14:15,282 INFO L82 PathProgramCache]: Analyzing trace with hash -1011952599, now seen corresponding path program 1 times [2019-12-07 13:14:15,282 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-12-07 13:14:15,282 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2023921901] [2019-12-07 13:14:15,282 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 13:14:15,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 13:14:15,335 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-12-07 13:14:15,335 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2023921901] [2019-12-07 13:14:15,335 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-12-07 13:14:15,335 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-12-07 13:14:15,335 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [490916458] [2019-12-07 13:14:15,336 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-12-07 13:14:15,336 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-12-07 13:14:15,336 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-12-07 13:14:15,336 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-12-07 13:14:15,336 INFO L87 Difference]: Start difference. First operand 37 states and 47 transitions. Second operand 5 states. [2019-12-07 13:14:15,489 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 13:14:15,489 INFO L93 Difference]: Finished difference Result 53 states and 64 transitions. [2019-12-07 13:14:15,489 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-12-07 13:14:15,490 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 24 [2019-12-07 13:14:15,490 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 13:14:15,490 INFO L225 Difference]: With dead ends: 53 [2019-12-07 13:14:15,491 INFO L226 Difference]: Without dead ends: 45 [2019-12-07 13:14:15,491 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-12-07 13:14:15,492 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2019-12-07 13:14:15,495 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 35. [2019-12-07 13:14:15,495 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2019-12-07 13:14:15,496 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 44 transitions. [2019-12-07 13:14:15,496 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 44 transitions. Word has length 24 [2019-12-07 13:14:15,496 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 13:14:15,496 INFO L462 AbstractCegarLoop]: Abstraction has 35 states and 44 transitions. [2019-12-07 13:14:15,496 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-12-07 13:14:15,497 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 44 transitions. [2019-12-07 13:14:15,497 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2019-12-07 13:14:15,497 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 13:14:15,498 INFO L410 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, 1] [2019-12-07 13:14:15,498 INFO L410 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-07 13:14:15,498 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 13:14:15,498 INFO L82 PathProgramCache]: Analyzing trace with hash 12750377, now seen corresponding path program 1 times [2019-12-07 13:14:15,499 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-12-07 13:14:15,499 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [239821803] [2019-12-07 13:14:15,499 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 13:14:15,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 13:14:15,544 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-12-07 13:14:15,544 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [239821803] [2019-12-07 13:14:15,544 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-12-07 13:14:15,544 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-12-07 13:14:15,545 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [344308493] [2019-12-07 13:14:15,545 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-12-07 13:14:15,545 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-12-07 13:14:15,545 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-12-07 13:14:15,546 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-12-07 13:14:15,546 INFO L87 Difference]: Start difference. First operand 35 states and 44 transitions. Second operand 5 states. [2019-12-07 13:14:15,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 13:14:15,679 INFO L93 Difference]: Finished difference Result 53 states and 64 transitions. [2019-12-07 13:14:15,679 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-12-07 13:14:15,679 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 24 [2019-12-07 13:14:15,680 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 13:14:15,680 INFO L225 Difference]: With dead ends: 53 [2019-12-07 13:14:15,680 INFO L226 Difference]: Without dead ends: 42 [2019-12-07 13:14:15,680 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-12-07 13:14:15,681 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2019-12-07 13:14:15,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 32. [2019-12-07 13:14:15,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2019-12-07 13:14:15,683 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 40 transitions. [2019-12-07 13:14:15,684 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 40 transitions. Word has length 24 [2019-12-07 13:14:15,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 13:14:15,684 INFO L462 AbstractCegarLoop]: Abstraction has 32 states and 40 transitions. [2019-12-07 13:14:15,684 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-12-07 13:14:15,684 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 40 transitions. [2019-12-07 13:14:15,684 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2019-12-07 13:14:15,684 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 13:14:15,685 INFO L410 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, 1, 1] [2019-12-07 13:14:15,685 INFO L410 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-07 13:14:15,685 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 13:14:15,685 INFO L82 PathProgramCache]: Analyzing trace with hash 2004396535, now seen corresponding path program 1 times [2019-12-07 13:14:15,685 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-12-07 13:14:15,685 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1504460019] [2019-12-07 13:14:15,685 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 13:14:15,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 13:14:15,779 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-12-07 13:14:15,780 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1504460019] [2019-12-07 13:14:15,780 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [620661976] [2019-12-07 13:14:15,780 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_aaccbcb2-9f26-4163-9ddd-6672402163fc/bin/utaipan/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 13:14:15,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 13:14:15,840 INFO L264 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 24 conjunts are in the unsatisfiable core [2019-12-07 13:14:15,844 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 13:14:15,877 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-12-07 13:14:15,877 INFO L534 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-12-07 13:14:15,879 INFO L614 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-12-07 13:14:15,879 INFO L534 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-12-07 13:14:15,880 INFO L239 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:6, output treesize:5 [2019-12-07 13:14:15,898 INFO L343 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2019-12-07 13:14:15,898 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 15 [2019-12-07 13:14:15,899 INFO L534 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-12-07 13:14:15,905 INFO L614 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-12-07 13:14:15,909 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2019-12-07 13:14:15,909 INFO L534 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2019-12-07 13:14:15,915 INFO L614 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-12-07 13:14:15,915 INFO L534 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-12-07 13:14:15,915 INFO L239 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:28, output treesize:18 [2019-12-07 13:14:15,929 INFO L343 Elim1Store]: treesize reduction 27, result has 20.6 percent of original size [2019-12-07 13:14:15,930 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 27 treesize of output 11 [2019-12-07 13:14:15,930 INFO L534 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-12-07 13:14:15,934 INFO L614 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-12-07 13:14:15,935 INFO L534 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-12-07 13:14:15,935 INFO L239 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:31, output treesize:12 [2019-12-07 13:14:15,951 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 18 [2019-12-07 13:14:15,952 INFO L534 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-12-07 13:14:15,957 INFO L614 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-12-07 13:14:15,958 INFO L534 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: 2 dim-0 vars, and 1 xjuncts. [2019-12-07 13:14:15,958 INFO L239 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:23, output treesize:19 [2019-12-07 13:14:15,980 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 10 [2019-12-07 13:14:15,981 INFO L534 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-12-07 13:14:15,985 INFO L614 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-12-07 13:14:15,985 INFO L534 ElimStorePlain]: Start of recursive call 1: 4 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-12-07 13:14:15,986 INFO L239 ElimStorePlain]: Needed 2 recursive calls to eliminate 5 variables, input treesize:26, output treesize:3 [2019-12-07 13:14:15,989 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-12-07 13:14:15,989 INFO L329 TraceCheckSpWp]: Computing backward predicates... [2019-12-07 13:14:16,008 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-12-07 13:14:16,015 INFO L534 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-12-07 13:14:16,017 INFO L534 ElimStorePlain]: Start of recursive call 3: 1 dim-0 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2019-12-07 13:14:16,021 INFO L614 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-12-07 13:14:16,022 INFO L534 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2019-12-07 13:14:16,022 INFO L239 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:54, output treesize:22 [2019-12-07 13:14:16,042 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-12-07 13:14:16,049 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 164 treesize of output 156 [2019-12-07 13:14:16,049 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 3 terms [2019-12-07 13:14:16,050 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-12-07 13:14:16,051 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-12-07 13:14:16,051 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-12-07 13:14:16,053 INFO L534 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-12-07 13:14:16,133 INFO L614 ElimStorePlain]: treesize reduction 171, result has 16.2 percent of original size [2019-12-07 13:14:16,134 INFO L534 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2019-12-07 13:14:16,134 INFO L239 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:34, output treesize:21 [2019-12-07 13:14:16,195 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-12-07 13:14:16,195 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1702391554] [2019-12-07 13:14:16,211 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2019-12-07 13:14:16,211 INFO L166 IcfgInterpreter]: Building call graph [2019-12-07 13:14:16,214 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-12-07 13:14:16,218 INFO L176 IcfgInterpreter]: Starting interpretation [2019-12-07 13:14:16,219 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-12-07 13:14:16,499 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 13:14:16,508 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 13:14:16,516 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 13:14:16,669 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 13:14:16,682 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 13:14:16,695 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 13:14:16,706 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 13:14:17,063 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 13:14:17,189 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 13:14:17,216 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 13:14:17,508 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 13:14:17,638 INFO L180 IcfgInterpreter]: Interpretation finished [2019-12-07 13:14:18,214 WARN L192 SmtUtils]: Spent 378.00 ms on a formula simplification. DAG size of input: 102 DAG size of output: 81 [2019-12-07 13:14:18,553 WARN L192 SmtUtils]: Spent 213.00 ms on a formula simplification. DAG size of input: 88 DAG size of output: 53 [2019-12-07 13:14:18,751 WARN L192 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 121 DAG size of output: 71 [2019-12-07 13:14:18,965 WARN L192 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 97 DAG size of output: 70 [2019-12-07 13:14:19,159 WARN L192 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 106 DAG size of output: 72 [2019-12-07 13:14:19,374 WARN L192 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 112 DAG size of output: 78 [2019-12-07 13:14:20,224 INFO L343 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-12-07 13:14:20,224 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-12-07 13:14:20,225 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 13 [2019-12-07 13:14:20,225 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1363173588] [2019-12-07 13:14:20,225 INFO L442 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-12-07 13:14:20,225 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-12-07 13:14:20,225 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-12-07 13:14:20,226 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=820, Unknown=0, NotChecked=0, Total=930 [2019-12-07 13:14:20,226 INFO L87 Difference]: Start difference. First operand 32 states and 40 transitions. Second operand 13 states. [2019-12-07 13:14:21,121 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 13:14:21,121 INFO L93 Difference]: Finished difference Result 54 states and 65 transitions. [2019-12-07 13:14:21,122 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-12-07 13:14:21,122 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 25 [2019-12-07 13:14:21,122 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 13:14:21,122 INFO L225 Difference]: With dead ends: 54 [2019-12-07 13:14:21,123 INFO L226 Difference]: Without dead ends: 48 [2019-12-07 13:14:21,123 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 46 SyntacticMatches, 6 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 357 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=168, Invalid=1164, Unknown=0, NotChecked=0, Total=1332 [2019-12-07 13:14:21,124 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2019-12-07 13:14:21,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 38. [2019-12-07 13:14:21,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2019-12-07 13:14:21,127 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 47 transitions. [2019-12-07 13:14:21,127 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 47 transitions. Word has length 25 [2019-12-07 13:14:21,127 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 13:14:21,127 INFO L462 AbstractCegarLoop]: Abstraction has 38 states and 47 transitions. [2019-12-07 13:14:21,127 INFO L463 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-12-07 13:14:21,127 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 47 transitions. [2019-12-07 13:14:21,128 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2019-12-07 13:14:21,128 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 13:14:21,128 INFO L410 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, 1, 1] [2019-12-07 13:14:21,329 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 13:14:21,330 INFO L410 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-07 13:14:21,330 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 13:14:21,331 INFO L82 PathProgramCache]: Analyzing trace with hash -1630379559, now seen corresponding path program 1 times [2019-12-07 13:14:21,331 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-12-07 13:14:21,331 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [171832208] [2019-12-07 13:14:21,332 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 13:14:21,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 13:14:21,421 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-12-07 13:14:21,421 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [171832208] [2019-12-07 13:14:21,421 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [904912430] [2019-12-07 13:14:21,422 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_aaccbcb2-9f26-4163-9ddd-6672402163fc/bin/utaipan/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 13:14:21,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 13:14:21,465 INFO L264 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 24 conjunts are in the unsatisfiable core [2019-12-07 13:14:21,466 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 13:14:21,541 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-12-07 13:14:21,541 INFO L329 TraceCheckSpWp]: Computing backward predicates... [2019-12-07 13:14:21,640 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-12-07 13:14:21,640 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [138163763] [2019-12-07 13:14:21,642 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2019-12-07 13:14:21,642 INFO L166 IcfgInterpreter]: Building call graph [2019-12-07 13:14:21,642 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-12-07 13:14:21,642 INFO L176 IcfgInterpreter]: Starting interpretation [2019-12-07 13:14:21,642 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-12-07 13:14:21,768 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 13:14:21,774 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 13:14:21,778 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 13:14:21,836 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 13:14:21,864 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 13:14:21,873 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 13:14:21,913 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 13:14:22,189 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 13:14:22,259 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 13:14:22,267 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 13:14:23,460 WARN L138 XnfTransformerHelper]: expecting exponential blowup for input size 6 [2019-12-07 13:14:23,492 WARN L138 XnfTransformerHelper]: expecting exponential blowup for input size 6 [2019-12-07 13:14:23,518 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 13:14:23,637 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 13:14:23,710 INFO L180 IcfgInterpreter]: Interpretation finished [2019-12-07 13:14:24,117 WARN L192 SmtUtils]: Spent 220.00 ms on a formula simplification. DAG size of input: 101 DAG size of output: 80 [2019-12-07 13:14:24,432 WARN L192 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 121 DAG size of output: 70 [2019-12-07 13:14:24,642 WARN L192 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 97 DAG size of output: 66 [2019-12-07 13:14:24,991 INFO L343 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-12-07 13:14:24,991 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-12-07 13:14:24,991 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 13 [2019-12-07 13:14:24,991 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [209219734] [2019-12-07 13:14:24,992 INFO L442 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-12-07 13:14:24,992 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-12-07 13:14:24,992 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-12-07 13:14:24,993 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=730, Unknown=0, NotChecked=0, Total=812 [2019-12-07 13:14:24,993 INFO L87 Difference]: Start difference. First operand 38 states and 47 transitions. Second operand 13 states. [2019-12-07 13:14:25,526 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 13:14:25,526 INFO L93 Difference]: Finished difference Result 48 states and 58 transitions. [2019-12-07 13:14:25,526 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-12-07 13:14:25,526 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 25 [2019-12-07 13:14:25,527 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 13:14:25,527 INFO L225 Difference]: With dead ends: 48 [2019-12-07 13:14:25,527 INFO L226 Difference]: Without dead ends: 44 [2019-12-07 13:14:25,528 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 50 SyntacticMatches, 4 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 240 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=136, Invalid=986, Unknown=0, NotChecked=0, Total=1122 [2019-12-07 13:14:25,528 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2019-12-07 13:14:25,530 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 42. [2019-12-07 13:14:25,530 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2019-12-07 13:14:25,530 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 52 transitions. [2019-12-07 13:14:25,531 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 52 transitions. Word has length 25 [2019-12-07 13:14:25,531 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 13:14:25,531 INFO L462 AbstractCegarLoop]: Abstraction has 42 states and 52 transitions. [2019-12-07 13:14:25,531 INFO L463 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-12-07 13:14:25,531 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 52 transitions. [2019-12-07 13:14:25,531 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2019-12-07 13:14:25,531 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 13:14:25,531 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-12-07 13:14:25,732 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 13:14:25,733 INFO L410 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-07 13:14:25,733 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 13:14:25,733 INFO L82 PathProgramCache]: Analyzing trace with hash -1141862798, now seen corresponding path program 1 times [2019-12-07 13:14:25,734 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-12-07 13:14:25,734 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [197684252] [2019-12-07 13:14:25,734 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 13:14:25,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 13:14:25,857 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 13:14:25,857 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [197684252] [2019-12-07 13:14:25,857 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [266770004] [2019-12-07 13:14:25,857 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_aaccbcb2-9f26-4163-9ddd-6672402163fc/bin/utaipan/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 13:14:25,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 13:14:25,901 INFO L264 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 31 conjunts are in the unsatisfiable core [2019-12-07 13:14:25,902 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 13:14:26,060 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-12-07 13:14:26,060 INFO L329 TraceCheckSpWp]: Computing backward predicates... [2019-12-07 13:14:26,244 WARN L192 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 34 [2019-12-07 13:14:26,438 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-12-07 13:14:26,438 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [738608562] [2019-12-07 13:14:26,440 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2019-12-07 13:14:26,440 INFO L166 IcfgInterpreter]: Building call graph [2019-12-07 13:14:26,440 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-12-07 13:14:26,440 INFO L176 IcfgInterpreter]: Starting interpretation [2019-12-07 13:14:26,441 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-12-07 13:14:26,511 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 13:14:26,599 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 13:14:26,606 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 13:14:26,613 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 13:14:26,750 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 13:14:26,758 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 13:14:26,765 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 13:14:26,772 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 13:14:27,048 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 13:14:27,201 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 13:14:27,221 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 13:14:27,427 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 13:14:27,602 INFO L180 IcfgInterpreter]: Interpretation finished [2019-12-07 13:14:28,009 WARN L192 SmtUtils]: Spent 195.00 ms on a formula simplification. DAG size of input: 101 DAG size of output: 80 [2019-12-07 13:14:28,341 WARN L192 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 121 DAG size of output: 70 [2019-12-07 13:14:28,581 WARN L192 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 97 DAG size of output: 66 [2019-12-07 13:14:28,783 WARN L192 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 106 DAG size of output: 70 [2019-12-07 13:14:29,019 WARN L192 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 112 DAG size of output: 76 [2019-12-07 13:14:29,502 INFO L343 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-12-07 13:14:29,502 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-12-07 13:14:29,502 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 9] total 19 [2019-12-07 13:14:29,502 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [960790262] [2019-12-07 13:14:29,503 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-12-07 13:14:29,503 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-12-07 13:14:29,503 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-12-07 13:14:29,503 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=1059, Unknown=0, NotChecked=0, Total=1190 [2019-12-07 13:14:29,503 INFO L87 Difference]: Start difference. First operand 42 states and 52 transitions. Second operand 19 states. [2019-12-07 13:14:30,322 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 13:14:30,322 INFO L93 Difference]: Finished difference Result 69 states and 84 transitions. [2019-12-07 13:14:30,322 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-12-07 13:14:30,322 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 27 [2019-12-07 13:14:30,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 13:14:30,323 INFO L225 Difference]: With dead ends: 69 [2019-12-07 13:14:30,323 INFO L226 Difference]: Without dead ends: 65 [2019-12-07 13:14:30,324 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 51 SyntacticMatches, 6 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 404 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=221, Invalid=1501, Unknown=0, NotChecked=0, Total=1722 [2019-12-07 13:14:30,324 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2019-12-07 13:14:30,327 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 58. [2019-12-07 13:14:30,327 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2019-12-07 13:14:30,327 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 72 transitions. [2019-12-07 13:14:30,327 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 72 transitions. Word has length 27 [2019-12-07 13:14:30,327 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 13:14:30,327 INFO L462 AbstractCegarLoop]: Abstraction has 58 states and 72 transitions. [2019-12-07 13:14:30,327 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-12-07 13:14:30,328 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 72 transitions. [2019-12-07 13:14:30,328 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2019-12-07 13:14:30,328 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 13:14:30,328 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-12-07 13:14:30,529 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 13:14:30,529 INFO L410 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-07 13:14:30,530 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 13:14:30,530 INFO L82 PathProgramCache]: Analyzing trace with hash -2064808403, now seen corresponding path program 1 times [2019-12-07 13:14:30,530 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-12-07 13:14:30,531 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1680154811] [2019-12-07 13:14:30,531 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 13:14:30,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 13:14:30,637 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 13:14:30,637 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1680154811] [2019-12-07 13:14:30,637 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2128426958] [2019-12-07 13:14:30,637 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_aaccbcb2-9f26-4163-9ddd-6672402163fc/bin/utaipan/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 13:14:30,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 13:14:30,682 INFO L264 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 32 conjunts are in the unsatisfiable core [2019-12-07 13:14:30,683 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 13:14:30,838 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-12-07 13:14:30,839 INFO L329 TraceCheckSpWp]: Computing backward predicates... [2019-12-07 13:14:31,178 WARN L192 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 49 DAG size of output: 33 [2019-12-07 13:14:31,287 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-12-07 13:14:31,287 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [534971992] [2019-12-07 13:14:31,288 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2019-12-07 13:14:31,289 INFO L166 IcfgInterpreter]: Building call graph [2019-12-07 13:14:31,289 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-12-07 13:14:31,289 INFO L176 IcfgInterpreter]: Starting interpretation [2019-12-07 13:14:31,289 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-12-07 13:14:31,347 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 13:14:31,366 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 13:14:31,429 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 13:14:31,435 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 13:14:31,439 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 13:14:31,498 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 13:14:31,507 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 13:14:31,539 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 13:14:31,546 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 13:14:31,778 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 13:14:31,926 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 13:14:31,933 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 13:14:32,169 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 13:14:32,278 INFO L180 IcfgInterpreter]: Interpretation finished [2019-12-07 13:14:32,676 WARN L192 SmtUtils]: Spent 194.00 ms on a formula simplification. DAG size of input: 92 DAG size of output: 79 [2019-12-07 13:14:33,021 WARN L192 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 121 DAG size of output: 70 [2019-12-07 13:14:33,246 WARN L192 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 88 DAG size of output: 68 [2019-12-07 13:14:33,548 WARN L192 SmtUtils]: Spent 219.00 ms on a formula simplification. DAG size of input: 97 DAG size of output: 72 [2019-12-07 13:14:33,816 WARN L192 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 103 DAG size of output: 76 [2019-12-07 13:14:34,506 WARN L192 SmtUtils]: Spent 309.00 ms on a formula simplification. DAG size of input: 67 DAG size of output: 53 [2019-12-07 13:14:34,758 INFO L343 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-12-07 13:14:34,759 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-12-07 13:14:34,759 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 9] total 21 [2019-12-07 13:14:34,759 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1459237490] [2019-12-07 13:14:34,759 INFO L442 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-12-07 13:14:34,759 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-12-07 13:14:34,759 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-12-07 13:14:34,760 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=1126, Unknown=0, NotChecked=0, Total=1260 [2019-12-07 13:14:34,760 INFO L87 Difference]: Start difference. First operand 58 states and 72 transitions. Second operand 21 states. [2019-12-07 13:14:35,362 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 13:14:35,362 INFO L93 Difference]: Finished difference Result 71 states and 86 transitions. [2019-12-07 13:14:35,362 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2019-12-07 13:14:35,362 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 29 [2019-12-07 13:14:35,362 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 13:14:35,363 INFO L225 Difference]: With dead ends: 71 [2019-12-07 13:14:35,363 INFO L226 Difference]: Without dead ends: 61 [2019-12-07 13:14:35,364 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 56 SyntacticMatches, 6 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 496 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=267, Invalid=1803, Unknown=0, NotChecked=0, Total=2070 [2019-12-07 13:14:35,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2019-12-07 13:14:35,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 53. [2019-12-07 13:14:35,367 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2019-12-07 13:14:35,367 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 66 transitions. [2019-12-07 13:14:35,367 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 66 transitions. Word has length 29 [2019-12-07 13:14:35,367 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 13:14:35,367 INFO L462 AbstractCegarLoop]: Abstraction has 53 states and 66 transitions. [2019-12-07 13:14:35,367 INFO L463 AbstractCegarLoop]: Interpolant automaton has 21 states. [2019-12-07 13:14:35,368 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 66 transitions. [2019-12-07 13:14:35,368 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2019-12-07 13:14:35,368 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 13:14:35,368 INFO L410 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, 1, 1, 1] [2019-12-07 13:14:35,569 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 13:14:35,570 INFO L410 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-07 13:14:35,570 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 13:14:35,570 INFO L82 PathProgramCache]: Analyzing trace with hash -1040105427, now seen corresponding path program 2 times [2019-12-07 13:14:35,571 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-12-07 13:14:35,571 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1825749631] [2019-12-07 13:14:35,571 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 13:14:35,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 13:14:35,677 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 13:14:35,677 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1825749631] [2019-12-07 13:14:35,677 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [577113116] [2019-12-07 13:14:35,677 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_aaccbcb2-9f26-4163-9ddd-6672402163fc/bin/utaipan/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 13:14:35,883 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-12-07 13:14:35,883 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-12-07 13:14:35,884 INFO L264 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 36 conjunts are in the unsatisfiable core [2019-12-07 13:14:35,886 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 13:14:35,995 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-12-07 13:14:35,995 INFO L329 TraceCheckSpWp]: Computing backward predicates... [2019-12-07 13:14:36,287 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-12-07 13:14:36,287 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [864227668] [2019-12-07 13:14:36,288 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2019-12-07 13:14:36,288 INFO L166 IcfgInterpreter]: Building call graph [2019-12-07 13:14:36,289 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-12-07 13:14:36,289 INFO L176 IcfgInterpreter]: Starting interpretation [2019-12-07 13:14:36,289 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-12-07 13:14:36,344 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 13:14:36,412 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 13:14:36,438 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 13:14:36,444 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 13:14:36,492 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 13:14:36,501 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 13:14:36,542 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 13:14:36,564 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 13:14:36,829 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 13:14:36,933 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 13:14:36,968 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 13:14:37,204 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 13:14:37,337 INFO L180 IcfgInterpreter]: Interpretation finished [2019-12-07 13:14:37,753 WARN L192 SmtUtils]: Spent 209.00 ms on a formula simplification. DAG size of input: 101 DAG size of output: 80 [2019-12-07 13:14:37,931 WARN L192 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 88 DAG size of output: 53 [2019-12-07 13:14:38,147 WARN L192 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 121 DAG size of output: 71 [2019-12-07 13:14:38,392 WARN L192 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 97 DAG size of output: 66 [2019-12-07 13:14:38,699 WARN L192 SmtUtils]: Spent 223.00 ms on a formula simplification. DAG size of input: 106 DAG size of output: 70 [2019-12-07 13:14:38,926 WARN L192 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 112 DAG size of output: 76 [2019-12-07 13:14:39,388 INFO L343 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-12-07 13:14:39,388 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-12-07 13:14:39,388 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 9] total 18 [2019-12-07 13:14:39,389 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1087408923] [2019-12-07 13:14:39,389 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-12-07 13:14:39,389 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-12-07 13:14:39,389 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-12-07 13:14:39,389 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=1005, Unknown=0, NotChecked=0, Total=1122 [2019-12-07 13:14:39,389 INFO L87 Difference]: Start difference. First operand 53 states and 66 transitions. Second operand 18 states. [2019-12-07 13:14:40,135 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 13:14:40,135 INFO L93 Difference]: Finished difference Result 66 states and 80 transitions. [2019-12-07 13:14:40,135 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2019-12-07 13:14:40,135 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 29 [2019-12-07 13:14:40,135 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 13:14:40,136 INFO L225 Difference]: With dead ends: 66 [2019-12-07 13:14:40,136 INFO L226 Difference]: Without dead ends: 53 [2019-12-07 13:14:40,136 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 57 SyntacticMatches, 7 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=233, Invalid=1659, Unknown=0, NotChecked=0, Total=1892 [2019-12-07 13:14:40,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2019-12-07 13:14:40,139 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 50. [2019-12-07 13:14:40,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2019-12-07 13:14:40,139 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 61 transitions. [2019-12-07 13:14:40,139 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 61 transitions. Word has length 29 [2019-12-07 13:14:40,139 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 13:14:40,139 INFO L462 AbstractCegarLoop]: Abstraction has 50 states and 61 transitions. [2019-12-07 13:14:40,139 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-12-07 13:14:40,139 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 61 transitions. [2019-12-07 13:14:40,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2019-12-07 13:14:40,140 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 13:14:40,140 INFO L410 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-12-07 13:14:40,340 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 13:14:40,341 INFO L410 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-07 13:14:40,341 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 13:14:40,341 INFO L82 PathProgramCache]: Analyzing trace with hash 170114441, now seen corresponding path program 3 times [2019-12-07 13:14:40,341 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-12-07 13:14:40,341 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1365587877] [2019-12-07 13:14:40,341 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 13:14:40,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 13:14:40,524 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 13:14:40,524 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1365587877] [2019-12-07 13:14:40,524 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1404233320] [2019-12-07 13:14:40,524 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_aaccbcb2-9f26-4163-9ddd-6672402163fc/bin/utaipan/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 13:14:40,574 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-12-07 13:14:40,574 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-12-07 13:14:40,575 INFO L264 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 44 conjunts are in the unsatisfiable core [2019-12-07 13:14:40,577 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 13:14:41,190 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-12-07 13:14:41,190 INFO L329 TraceCheckSpWp]: Computing backward predicates... [2019-12-07 13:14:43,236 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_DerPreprocessor_11 Int) (v_DerPreprocessor_12 Int) (ULTIMATE.start_main_~p~0.offset Int)) (= (let ((.cse0 (+ c_ULTIMATE.start_main_~a~0.offset 4))) (select (select (store |c_#memory_int| c_ULTIMATE.start_main_~p~0.base (store (select |c_#memory_int| c_ULTIMATE.start_main_~p~0.base) ULTIMATE.start_main_~p~0.offset 3)) (select (select (store |c_#memory_$Pointer$.base| c_ULTIMATE.start_main_~p~0.base (store (select |c_#memory_$Pointer$.base| c_ULTIMATE.start_main_~p~0.base) ULTIMATE.start_main_~p~0.offset v_DerPreprocessor_12)) c_ULTIMATE.start_main_~a~0.base) .cse0)) (select (select (store |c_#memory_$Pointer$.offset| c_ULTIMATE.start_main_~p~0.base (store (select |c_#memory_$Pointer$.offset| c_ULTIMATE.start_main_~p~0.base) ULTIMATE.start_main_~p~0.offset v_DerPreprocessor_11)) c_ULTIMATE.start_main_~a~0.base) .cse0))) 2)) is different from false [2019-12-07 13:14:44,941 WARN L192 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 82 DAG size of output: 63 [2019-12-07 13:14:45,944 WARN L192 SmtUtils]: Spent 550.00 ms on a formula simplification. DAG size of input: 113 DAG size of output: 70 [2019-12-07 13:14:50,676 WARN L192 SmtUtils]: Spent 3.52 s on a formula simplification. DAG size of input: 559 DAG size of output: 63 [2019-12-07 13:14:51,359 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 4 not checked. [2019-12-07 13:14:51,359 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1359584006] [2019-12-07 13:14:51,361 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2019-12-07 13:14:51,361 INFO L166 IcfgInterpreter]: Building call graph [2019-12-07 13:14:51,362 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-12-07 13:14:51,362 INFO L176 IcfgInterpreter]: Starting interpretation [2019-12-07 13:14:51,362 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-12-07 13:14:51,542 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 13:14:51,547 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 13:14:51,552 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 13:14:51,631 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 13:14:51,639 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 13:14:51,646 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 13:14:51,653 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 13:14:51,940 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 13:14:52,085 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 13:14:52,118 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 13:14:52,332 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 13:14:52,442 INFO L180 IcfgInterpreter]: Interpretation finished [2019-12-07 13:14:52,929 WARN L192 SmtUtils]: Spent 204.00 ms on a formula simplification. DAG size of input: 102 DAG size of output: 81 [2019-12-07 13:14:53,211 WARN L192 SmtUtils]: Spent 191.00 ms on a formula simplification. DAG size of input: 88 DAG size of output: 53 [2019-12-07 13:14:53,904 WARN L192 SmtUtils]: Spent 466.00 ms on a formula simplification. DAG size of input: 121 DAG size of output: 71 [2019-12-07 13:14:54,629 WARN L192 SmtUtils]: Spent 297.00 ms on a formula simplification. DAG size of input: 97 DAG size of output: 70 [2019-12-07 13:14:55,051 WARN L192 SmtUtils]: Spent 241.00 ms on a formula simplification. DAG size of input: 106 DAG size of output: 72 [2019-12-07 13:14:55,458 WARN L192 SmtUtils]: Spent 272.00 ms on a formula simplification. DAG size of input: 112 DAG size of output: 78 [2019-12-07 13:14:55,896 WARN L192 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 67 DAG size of output: 53 [2019-12-07 13:14:56,276 INFO L343 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-12-07 13:14:56,276 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-12-07 13:14:56,277 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 11, 11] total 28 [2019-12-07 13:14:56,277 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1380711280] [2019-12-07 13:14:56,277 INFO L442 AbstractCegarLoop]: Interpolant automaton has 28 states [2019-12-07 13:14:56,277 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-12-07 13:14:56,278 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2019-12-07 13:14:56,279 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=1635, Unknown=1, NotChecked=82, Total=1892 [2019-12-07 13:14:56,279 INFO L87 Difference]: Start difference. First operand 50 states and 61 transitions. Second operand 28 states. [2019-12-07 13:15:06,550 WARN L192 SmtUtils]: Spent 7.96 s on a formula simplification. DAG size of input: 95 DAG size of output: 67 [2019-12-07 13:15:11,692 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 13:15:11,692 INFO L93 Difference]: Finished difference Result 81 states and 96 transitions. [2019-12-07 13:15:11,692 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-12-07 13:15:11,693 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 30 [2019-12-07 13:15:11,693 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 13:15:11,693 INFO L225 Difference]: With dead ends: 81 [2019-12-07 13:15:11,693 INFO L226 Difference]: Without dead ends: 75 [2019-12-07 13:15:11,694 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 54 SyntacticMatches, 6 SemanticMatches, 54 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 728 ImplicationChecksByTransitivity, 17.6s TimeCoverageRelationStatistics Valid=336, Invalid=2637, Unknown=1, NotChecked=106, Total=3080 [2019-12-07 13:15:11,694 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2019-12-07 13:15:11,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 62. [2019-12-07 13:15:11,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2019-12-07 13:15:11,697 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 76 transitions. [2019-12-07 13:15:11,697 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 76 transitions. Word has length 30 [2019-12-07 13:15:11,698 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 13:15:11,698 INFO L462 AbstractCegarLoop]: Abstraction has 62 states and 76 transitions. [2019-12-07 13:15:11,698 INFO L463 AbstractCegarLoop]: Interpolant automaton has 28 states. [2019-12-07 13:15:11,698 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 76 transitions. [2019-12-07 13:15:11,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2019-12-07 13:15:11,698 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 13:15:11,698 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-12-07 13:15:11,899 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 13:15:11,900 INFO L410 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-07 13:15:11,900 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 13:15:11,901 INFO L82 PathProgramCache]: Analyzing trace with hash 500689127, now seen corresponding path program 1 times [2019-12-07 13:15:11,901 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-12-07 13:15:11,901 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1734180995] [2019-12-07 13:15:11,902 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 13:15:11,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-12-07 13:15:11,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-12-07 13:15:11,953 INFO L174 FreeRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2019-12-07 13:15:11,953 INFO L475 BasicCegarLoop]: Counterexample might be feasible [2019-12-07 13:15:11,985 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 07.12 01:15:11 BoogieIcfgContainer [2019-12-07 13:15:11,985 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2019-12-07 13:15:11,985 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2019-12-07 13:15:11,985 INFO L271 PluginConnector]: Initializing Witness Printer... [2019-12-07 13:15:11,985 INFO L275 PluginConnector]: Witness Printer initialized [2019-12-07 13:15:11,986 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.12 01:14:14" (3/4) ... [2019-12-07 13:15:11,987 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2019-12-07 13:15:12,020 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_aaccbcb2-9f26-4163-9ddd-6672402163fc/bin/utaipan/witness.graphml [2019-12-07 13:15:12,020 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2019-12-07 13:15:12,020 INFO L168 Benchmark]: Toolchain (without parser) took 58396.34 ms. Allocated memory was 1.0 GB in the beginning and 1.5 GB in the end (delta: 448.8 MB). Free memory was 937.1 MB in the beginning and 1.4 GB in the end (delta: -465.5 MB). There was no memory consumed. Max. memory is 11.5 GB. [2019-12-07 13:15:12,020 INFO L168 Benchmark]: CDTParser took 0.17 ms. Allocated memory is still 1.0 GB. Free memory is still 958.6 MB. There was no memory consumed. Max. memory is 11.5 GB. [2019-12-07 13:15:12,021 INFO L168 Benchmark]: CACSL2BoogieTranslator took 332.99 ms. Allocated memory was 1.0 GB in the beginning and 1.1 GB in the end (delta: 95.4 MB). Free memory was 937.1 MB in the beginning and 1.1 GB in the end (delta: -136.9 MB). Peak memory consumption was 18.0 MB. Max. memory is 11.5 GB. [2019-12-07 13:15:12,021 INFO L168 Benchmark]: Boogie Procedure Inliner took 37.11 ms. Allocated memory is still 1.1 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 5.4 MB). Peak memory consumption was 5.4 MB. Max. memory is 11.5 GB. [2019-12-07 13:15:12,021 INFO L168 Benchmark]: Boogie Preprocessor took 26.59 ms. Allocated memory is still 1.1 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB. [2019-12-07 13:15:12,021 INFO L168 Benchmark]: RCFGBuilder took 696.11 ms. Allocated memory is still 1.1 GB. Free memory was 1.1 GB in the beginning and 990.9 MB in the end (delta: 77.8 MB). Peak memory consumption was 77.8 MB. Max. memory is 11.5 GB. [2019-12-07 13:15:12,021 INFO L168 Benchmark]: TraceAbstraction took 57265.74 ms. Allocated memory was 1.1 GB in the beginning and 1.5 GB in the end (delta: 353.4 MB). Free memory was 990.9 MB in the beginning and 1.4 GB in the end (delta: -414.5 MB). There was no memory consumed. Max. memory is 11.5 GB. [2019-12-07 13:15:12,021 INFO L168 Benchmark]: Witness Printer took 34.66 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 2.8 MB). Peak memory consumption was 2.8 MB. Max. memory is 11.5 GB. [2019-12-07 13:15:12,022 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.17 ms. Allocated memory is still 1.0 GB. Free memory is still 958.6 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 332.99 ms. Allocated memory was 1.0 GB in the beginning and 1.1 GB in the end (delta: 95.4 MB). Free memory was 937.1 MB in the beginning and 1.1 GB in the end (delta: -136.9 MB). Peak memory consumption was 18.0 MB. Max. memory is 11.5 GB. * Boogie Procedure Inliner took 37.11 ms. Allocated memory is still 1.1 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 5.4 MB). Peak memory consumption was 5.4 MB. Max. memory is 11.5 GB. * Boogie Preprocessor took 26.59 ms. Allocated memory is still 1.1 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB. * RCFGBuilder took 696.11 ms. Allocated memory is still 1.1 GB. Free memory was 1.1 GB in the beginning and 990.9 MB in the end (delta: 77.8 MB). Peak memory consumption was 77.8 MB. Max. memory is 11.5 GB. * TraceAbstraction took 57265.74 ms. Allocated memory was 1.1 GB in the beginning and 1.5 GB in the end (delta: 353.4 MB). Free memory was 990.9 MB in the beginning and 1.4 GB in the end (delta: -414.5 MB). There was no memory consumed. Max. memory is 11.5 GB. * Witness Printer took 34.66 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 2.8 MB). Peak memory consumption was 2.8 MB. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 609]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L541] struct TreeNode* root = malloc(sizeof(*root)), *n; [L542] root->left = ((void *)0) [L543] root->right = ((void *)0) [L544] COND FALSE !(__VERIFIER_nondet_int()) [L563] n = ((void *)0) [L564] struct TreeNode* pred; [L565] COND TRUE \read(*root) [L566] pred = ((void *)0) [L567] n = root [L568] EXPR n->left [L568] n->left || n->right [L568] EXPR n->right [L568] n->left || n->right [L568] COND FALSE !(n->left || n->right) [L575] COND FALSE !(\read(*pred)) [L581] root = ((void *)0) [L565] COND FALSE !(\read(*root)) [L584] List a = (List) malloc(sizeof(struct node)); [L585] COND FALSE !(a == 0) [L586] List t; [L587] List p = a; [L588] COND TRUE __VERIFIER_nondet_int() [L589] p->h = 1 [L590] t = (List) malloc(sizeof(struct node)) [L591] COND FALSE !(t == 0) [L592] p->n = t [L593] EXPR p->n [L593] p = p->n [L588] COND FALSE !(__VERIFIER_nondet_int()) [L595] COND TRUE __VERIFIER_nondet_int() [L596] p->h = 2 [L597] t = (List) malloc(sizeof(struct node)) [L598] COND FALSE !(t == 0) [L599] p->n = t [L600] EXPR p->n [L600] p = p->n [L595] COND FALSE !(__VERIFIER_nondet_int()) [L602] p->h = 3 [L603] p = a [L604] EXPR p->h [L604] COND FALSE !(p->h == 2) [L606] EXPR p->h [L606] COND TRUE p->h == 1 [L607] EXPR p->n [L607] p = p->n [L606] EXPR p->h [L606] COND FALSE !(p->h == 1) [L608] EXPR p->h [L608] COND TRUE p->h != 3 [L609] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 32 locations, 1 error locations. Result: UNSAFE, OverallTime: 57.2s, OverallIterations: 12, TraceHistogramMax: 3, AutomataDifference: 19.5s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, HoareTripleCheckerStatistics: 297 SDtfs, 553 SDslu, 1466 SDs, 0 SdLazy, 1725 SolverSat, 302 SolverUnsat, 2 SolverUnknown, 0 SolverNotchecked, 9.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 621 GetRequests, 323 SyntacticMatches, 35 SemanticMatches, 263 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 2645 ImplicationChecksByTransitivity, 29.8s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=62occurred in iteration=11, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 11 MinimizatonAttempts, 76 StatesRemovedByMinimization, 10 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.3s SatisfiabilityAnalysisTime, 13.5s InterpolantComputationTime, 461 NumberOfCodeBlocks, 456 NumberOfCodeBlocksAsserted, 20 NumberOfCheckSat, 573 ConstructedInterpolants, 48 QuantifiedInterpolants, 158176 SizeOfPredicates, 101 NumberOfNonLiveVariables, 790 ConjunctsInSsa, 191 ConjunctsInUnsatCore, 23 InterpolantComputations, 5 PerfectInterpolantSequences, 39/118 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...