./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/array-memsafety/openbsd_cstrnlen-alloca-1.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) 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_8aabcfa5-fb25-40a6-9510-9d72b4068ea0/bin/utaipan/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/run_dir_8aabcfa5-fb25-40a6-9510-9d72b4068ea0/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_8aabcfa5-fb25-40a6-9510-9d72b4068ea0/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_8aabcfa5-fb25-40a6-9510-9d72b4068ea0/bin/utaipan/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/openbsd_cstrnlen-alloca-1.i -s /tmp/vcloud-vcloud-master/worker/run_dir_8aabcfa5-fb25-40a6-9510-9d72b4068ea0/bin/utaipan/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_8aabcfa5-fb25-40a6-9510-9d72b4068ea0/bin/utaipan --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 7ac509d7b3f1ef173e01ced3ce9249a58ee1c04d .................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................. Execution finished normally Writing output log to file Ultimate.log Result: TRUE --- Real Ultimate output --- This is Ultimate 0.1.25-f470102 [2019-12-07 12:29:54,101 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-12-07 12:29:54,102 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-12-07 12:29:54,111 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-12-07 12:29:54,111 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-12-07 12:29:54,112 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-12-07 12:29:54,113 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-12-07 12:29:54,115 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-12-07 12:29:54,116 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-12-07 12:29:54,117 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-12-07 12:29:54,118 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-12-07 12:29:54,119 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-12-07 12:29:54,119 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-12-07 12:29:54,120 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-12-07 12:29:54,121 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-12-07 12:29:54,122 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-12-07 12:29:54,123 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-12-07 12:29:54,124 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-12-07 12:29:54,125 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-12-07 12:29:54,127 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-12-07 12:29:54,129 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-12-07 12:29:54,129 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-12-07 12:29:54,130 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-12-07 12:29:54,131 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-12-07 12:29:54,133 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-12-07 12:29:54,133 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-12-07 12:29:54,133 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-12-07 12:29:54,134 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-12-07 12:29:54,134 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-12-07 12:29:54,135 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-12-07 12:29:54,135 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-12-07 12:29:54,136 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-12-07 12:29:54,136 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-12-07 12:29:54,136 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-12-07 12:29:54,137 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-12-07 12:29:54,137 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-12-07 12:29:54,138 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-12-07 12:29:54,138 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-12-07 12:29:54,138 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-12-07 12:29:54,139 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-12-07 12:29:54,140 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-12-07 12:29:54,141 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_8aabcfa5-fb25-40a6-9510-9d72b4068ea0/bin/utaipan/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2019-12-07 12:29:54,154 INFO L113 SettingsManager]: Loading preferences was successful [2019-12-07 12:29:54,154 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-12-07 12:29:54,154 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-12-07 12:29:54,155 INFO L138 SettingsManager]: * User list type=DISABLED [2019-12-07 12:29:54,155 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-12-07 12:29:54,155 INFO L138 SettingsManager]: * Explicit value domain=true [2019-12-07 12:29:54,155 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2019-12-07 12:29:54,155 INFO L138 SettingsManager]: * Octagon Domain=false [2019-12-07 12:29:54,155 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2019-12-07 12:29:54,155 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2019-12-07 12:29:54,155 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2019-12-07 12:29:54,156 INFO L138 SettingsManager]: * Interval Domain=false [2019-12-07 12:29:54,156 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2019-12-07 12:29:54,156 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2019-12-07 12:29:54,156 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2019-12-07 12:29:54,157 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-12-07 12:29:54,157 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-12-07 12:29:54,157 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-12-07 12:29:54,157 INFO L138 SettingsManager]: * sizeof long=4 [2019-12-07 12:29:54,157 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2019-12-07 12:29:54,157 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-12-07 12:29:54,157 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-12-07 12:29:54,157 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-12-07 12:29:54,157 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2019-12-07 12:29:54,158 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2019-12-07 12:29:54,158 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2019-12-07 12:29:54,158 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-12-07 12:29:54,158 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2019-12-07 12:29:54,158 INFO L138 SettingsManager]: * sizeof long double=12 [2019-12-07 12:29:54,158 INFO L138 SettingsManager]: * Use constant arrays=true [2019-12-07 12:29:54,158 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-12-07 12:29:54,158 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-12-07 12:29:54,158 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-12-07 12:29:54,159 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-12-07 12:29:54,159 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-12-07 12:29:54,159 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-12-07 12:29:54,159 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2019-12-07 12:29:54,159 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-12-07 12:29:54,159 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2019-12-07 12:29:54,159 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-12-07 12:29:54,159 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_8aabcfa5-fb25-40a6-9510-9d72b4068ea0/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 valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) 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 -> 7ac509d7b3f1ef173e01ced3ce9249a58ee1c04d [2019-12-07 12:29:54,265 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-12-07 12:29:54,276 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-12-07 12:29:54,279 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-12-07 12:29:54,280 INFO L271 PluginConnector]: Initializing CDTParser... [2019-12-07 12:29:54,280 INFO L275 PluginConnector]: CDTParser initialized [2019-12-07 12:29:54,281 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_8aabcfa5-fb25-40a6-9510-9d72b4068ea0/bin/utaipan/../../sv-benchmarks/c/array-memsafety/openbsd_cstrnlen-alloca-1.i [2019-12-07 12:29:54,320 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_8aabcfa5-fb25-40a6-9510-9d72b4068ea0/bin/utaipan/data/c6173e8a9/ada8a11bb82c4096aa274fde15829cb5/FLAG0dc9162e0 [2019-12-07 12:29:54,736 INFO L306 CDTParser]: Found 1 translation units. [2019-12-07 12:29:54,737 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_8aabcfa5-fb25-40a6-9510-9d72b4068ea0/sv-benchmarks/c/array-memsafety/openbsd_cstrnlen-alloca-1.i [2019-12-07 12:29:54,746 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_8aabcfa5-fb25-40a6-9510-9d72b4068ea0/bin/utaipan/data/c6173e8a9/ada8a11bb82c4096aa274fde15829cb5/FLAG0dc9162e0 [2019-12-07 12:29:55,102 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_8aabcfa5-fb25-40a6-9510-9d72b4068ea0/bin/utaipan/data/c6173e8a9/ada8a11bb82c4096aa274fde15829cb5 [2019-12-07 12:29:55,105 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-12-07 12:29:55,106 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2019-12-07 12:29:55,107 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-12-07 12:29:55,107 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-12-07 12:29:55,110 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-12-07 12:29:55,110 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.12 12:29:55" (1/1) ... [2019-12-07 12:29:55,113 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3f83379f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 12:29:55, skipping insertion in model container [2019-12-07 12:29:55,113 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.12 12:29:55" (1/1) ... [2019-12-07 12:29:55,118 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2019-12-07 12:29:55,142 INFO L178 MainTranslator]: Built tables and reachable declarations [2019-12-07 12:29:55,339 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-12-07 12:29:55,345 INFO L203 MainTranslator]: Completed pre-run [2019-12-07 12:29:55,371 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-12-07 12:29:55,401 INFO L208 MainTranslator]: Completed translation [2019-12-07 12:29:55,402 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 12:29:55 WrapperNode [2019-12-07 12:29:55,402 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-12-07 12:29:55,402 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-12-07 12:29:55,402 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-12-07 12:29:55,402 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2019-12-07 12:29:55,408 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 12:29:55" (1/1) ... [2019-12-07 12:29:55,418 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 12:29:55" (1/1) ... [2019-12-07 12:29:55,432 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-12-07 12:29:55,432 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-12-07 12:29:55,432 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-12-07 12:29:55,432 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-12-07 12:29:55,438 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 12:29:55" (1/1) ... [2019-12-07 12:29:55,438 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 12:29:55" (1/1) ... [2019-12-07 12:29:55,440 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 12:29:55" (1/1) ... [2019-12-07 12:29:55,441 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 12:29:55" (1/1) ... [2019-12-07 12:29:55,445 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 12:29:55" (1/1) ... [2019-12-07 12:29:55,447 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 12:29:55" (1/1) ... [2019-12-07 12:29:55,448 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 12:29:55" (1/1) ... [2019-12-07 12:29:55,450 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-12-07 12:29:55,451 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-12-07 12:29:55,451 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-12-07 12:29:55,451 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-12-07 12:29:55,451 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 12:29:55" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_8aabcfa5-fb25-40a6-9510-9d72b4068ea0/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 12:29:55,490 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-12-07 12:29:55,491 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-12-07 12:29:55,491 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-12-07 12:29:55,491 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-12-07 12:29:55,491 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-12-07 12:29:55,491 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-12-07 12:29:55,729 INFO L282 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-12-07 12:29:55,729 INFO L287 CfgBuilder]: Removed 8 assume(true) statements. [2019-12-07 12:29:55,730 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.12 12:29:55 BoogieIcfgContainer [2019-12-07 12:29:55,730 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-12-07 12:29:55,730 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-12-07 12:29:55,731 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-12-07 12:29:55,732 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-12-07 12:29:55,733 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.12 12:29:55" (1/3) ... [2019-12-07 12:29:55,733 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@233fd331 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.12 12:29:55, skipping insertion in model container [2019-12-07 12:29:55,733 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 12:29:55" (2/3) ... [2019-12-07 12:29:55,733 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@233fd331 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.12 12:29:55, skipping insertion in model container [2019-12-07 12:29:55,733 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.12 12:29:55" (3/3) ... [2019-12-07 12:29:55,734 INFO L109 eAbstractionObserver]: Analyzing ICFG openbsd_cstrnlen-alloca-1.i [2019-12-07 12:29:55,741 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-12-07 12:29:55,745 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 7 error locations. [2019-12-07 12:29:55,752 INFO L249 AbstractCegarLoop]: Starting to check reachability of 7 error locations. [2019-12-07 12:29:55,765 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-12-07 12:29:55,765 INFO L374 AbstractCegarLoop]: Hoare is false [2019-12-07 12:29:55,765 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-12-07 12:29:55,765 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-12-07 12:29:55,765 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-12-07 12:29:55,766 INFO L378 AbstractCegarLoop]: Difference is false [2019-12-07 12:29:55,766 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-12-07 12:29:55,766 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-12-07 12:29:55,775 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states. [2019-12-07 12:29:55,779 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2019-12-07 12:29:55,779 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 12:29:55,780 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1] [2019-12-07 12:29:55,780 INFO L410 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2019-12-07 12:29:55,783 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 12:29:55,784 INFO L82 PathProgramCache]: Analyzing trace with hash 108370, now seen corresponding path program 1 times [2019-12-07 12:29:55,789 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-12-07 12:29:55,790 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [404625631] [2019-12-07 12:29:55,790 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 12:29:55,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 12:29:55,892 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 12:29:55,893 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [404625631] [2019-12-07 12:29:55,893 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-12-07 12:29:55,893 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2019-12-07 12:29:55,894 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [145577587] [2019-12-07 12:29:55,897 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-12-07 12:29:55,897 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-12-07 12:29:55,906 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-12-07 12:29:55,906 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-12-07 12:29:55,907 INFO L87 Difference]: Start difference. First operand 18 states. Second operand 3 states. [2019-12-07 12:29:55,931 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 12:29:55,932 INFO L93 Difference]: Finished difference Result 16 states and 18 transitions. [2019-12-07 12:29:55,932 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-12-07 12:29:55,933 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 3 [2019-12-07 12:29:55,933 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 12:29:55,939 INFO L225 Difference]: With dead ends: 16 [2019-12-07 12:29:55,939 INFO L226 Difference]: Without dead ends: 15 [2019-12-07 12:29:55,940 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 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 12:29:55,956 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2019-12-07 12:29:55,965 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2019-12-07 12:29:55,966 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2019-12-07 12:29:55,966 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2019-12-07 12:29:55,967 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 3 [2019-12-07 12:29:55,967 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 12:29:55,967 INFO L462 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2019-12-07 12:29:55,967 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-12-07 12:29:55,967 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2019-12-07 12:29:55,967 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2019-12-07 12:29:55,967 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 12:29:55,968 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1] [2019-12-07 12:29:55,968 INFO L410 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2019-12-07 12:29:55,968 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 12:29:55,968 INFO L82 PathProgramCache]: Analyzing trace with hash 108371, now seen corresponding path program 1 times [2019-12-07 12:29:55,968 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-12-07 12:29:55,968 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2077087391] [2019-12-07 12:29:55,968 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 12:29:55,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 12:29:56,014 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 12:29:56,014 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2077087391] [2019-12-07 12:29:56,015 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-12-07 12:29:56,015 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-12-07 12:29:56,015 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [610784265] [2019-12-07 12:29:56,016 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-12-07 12:29:56,016 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-12-07 12:29:56,017 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-12-07 12:29:56,017 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-12-07 12:29:56,017 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 4 states. [2019-12-07 12:29:56,063 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 12:29:56,063 INFO L93 Difference]: Finished difference Result 28 states and 32 transitions. [2019-12-07 12:29:56,063 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-12-07 12:29:56,063 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 3 [2019-12-07 12:29:56,063 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 12:29:56,064 INFO L225 Difference]: With dead ends: 28 [2019-12-07 12:29:56,064 INFO L226 Difference]: Without dead ends: 28 [2019-12-07 12:29:56,065 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2019-12-07 12:29:56,065 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2019-12-07 12:29:56,067 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 17. [2019-12-07 12:29:56,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2019-12-07 12:29:56,068 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 20 transitions. [2019-12-07 12:29:56,068 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 20 transitions. Word has length 3 [2019-12-07 12:29:56,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 12:29:56,068 INFO L462 AbstractCegarLoop]: Abstraction has 17 states and 20 transitions. [2019-12-07 12:29:56,068 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-12-07 12:29:56,069 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 20 transitions. [2019-12-07 12:29:56,069 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2019-12-07 12:29:56,069 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 12:29:56,069 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1] [2019-12-07 12:29:56,069 INFO L410 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2019-12-07 12:29:56,069 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 12:29:56,069 INFO L82 PathProgramCache]: Analyzing trace with hash 110085, now seen corresponding path program 1 times [2019-12-07 12:29:56,070 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-12-07 12:29:56,070 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1711206055] [2019-12-07 12:29:56,070 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 12:29:56,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 12:29:56,119 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 12:29:56,119 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1711206055] [2019-12-07 12:29:56,120 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-12-07 12:29:56,120 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2019-12-07 12:29:56,120 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1538453440] [2019-12-07 12:29:56,120 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-12-07 12:29:56,120 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-12-07 12:29:56,120 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-12-07 12:29:56,120 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-12-07 12:29:56,120 INFO L87 Difference]: Start difference. First operand 17 states and 20 transitions. Second operand 3 states. [2019-12-07 12:29:56,129 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 12:29:56,129 INFO L93 Difference]: Finished difference Result 16 states and 19 transitions. [2019-12-07 12:29:56,129 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-12-07 12:29:56,129 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 3 [2019-12-07 12:29:56,130 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 12:29:56,130 INFO L225 Difference]: With dead ends: 16 [2019-12-07 12:29:56,130 INFO L226 Difference]: Without dead ends: 16 [2019-12-07 12:29:56,130 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 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 12:29:56,130 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2019-12-07 12:29:56,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2019-12-07 12:29:56,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2019-12-07 12:29:56,132 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 19 transitions. [2019-12-07 12:29:56,132 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 19 transitions. Word has length 3 [2019-12-07 12:29:56,132 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 12:29:56,132 INFO L462 AbstractCegarLoop]: Abstraction has 16 states and 19 transitions. [2019-12-07 12:29:56,132 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-12-07 12:29:56,132 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 19 transitions. [2019-12-07 12:29:56,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2019-12-07 12:29:56,132 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 12:29:56,133 INFO L410 BasicCegarLoop]: trace histogram [2, 1, 1, 1] [2019-12-07 12:29:56,133 INFO L410 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2019-12-07 12:29:56,133 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 12:29:56,133 INFO L82 PathProgramCache]: Analyzing trace with hash 104192359, now seen corresponding path program 1 times [2019-12-07 12:29:56,133 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-12-07 12:29:56,133 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1286947882] [2019-12-07 12:29:56,133 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 12:29:56,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 12:29:56,176 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 12:29:56,176 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1286947882] [2019-12-07 12:29:56,176 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1711628245] [2019-12-07 12:29:56,176 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_8aabcfa5-fb25-40a6-9510-9d72b4068ea0/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 12:29:56,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 12:29:56,210 INFO L264 TraceCheckSpWp]: Trace formula consists of 42 conjuncts, 11 conjunts are in the unsatisfiable core [2019-12-07 12:29:56,213 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 12:29:56,249 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 12:29:56,249 INFO L534 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-12-07 12:29:56,255 INFO L614 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-12-07 12:29:56,255 INFO L534 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-12-07 12:29:56,255 INFO L239 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:13, output treesize:12 [2019-12-07 12:29:56,290 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 12:29:56,290 INFO L329 TraceCheckSpWp]: Computing backward predicates... [2019-12-07 12:29:56,314 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-12-07 12:29:56,335 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 12:29:56,336 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1621239588] [2019-12-07 12:29:56,351 INFO L159 IcfgInterpreter]: Started Sifa with 4 locations of interest [2019-12-07 12:29:56,351 INFO L166 IcfgInterpreter]: Building call graph [2019-12-07 12:29:56,355 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-12-07 12:29:56,359 INFO L176 IcfgInterpreter]: Starting interpretation [2019-12-07 12:29:56,359 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-12-07 12:29:56,559 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 12:29:56,565 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 12:29:56,675 INFO L180 IcfgInterpreter]: Interpretation finished [2019-12-07 12:29:56,882 INFO L343 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-12-07 12:29:56,882 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-12-07 12:29:56,882 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 9 [2019-12-07 12:29:56,882 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1799970859] [2019-12-07 12:29:56,883 INFO L442 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-12-07 12:29:56,883 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-12-07 12:29:56,883 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-12-07 12:29:56,884 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2019-12-07 12:29:56,884 INFO L87 Difference]: Start difference. First operand 16 states and 19 transitions. Second operand 11 states. [2019-12-07 12:29:56,995 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 12:29:56,995 INFO L93 Difference]: Finished difference Result 36 states and 42 transitions. [2019-12-07 12:29:56,996 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-12-07 12:29:56,996 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 5 [2019-12-07 12:29:56,996 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 12:29:56,996 INFO L225 Difference]: With dead ends: 36 [2019-12-07 12:29:56,997 INFO L226 Difference]: Without dead ends: 36 [2019-12-07 12:29:56,997 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=75, Invalid=197, Unknown=0, NotChecked=0, Total=272 [2019-12-07 12:29:56,998 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2019-12-07 12:29:56,999 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 13. [2019-12-07 12:29:57,000 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2019-12-07 12:29:57,000 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 15 transitions. [2019-12-07 12:29:57,000 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 15 transitions. Word has length 5 [2019-12-07 12:29:57,000 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 12:29:57,000 INFO L462 AbstractCegarLoop]: Abstraction has 13 states and 15 transitions. [2019-12-07 12:29:57,001 INFO L463 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-12-07 12:29:57,001 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 15 transitions. [2019-12-07 12:29:57,001 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2019-12-07 12:29:57,001 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 12:29:57,001 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2019-12-07 12:29:57,202 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 12:29:57,202 INFO L410 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2019-12-07 12:29:57,203 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 12:29:57,203 INFO L82 PathProgramCache]: Analyzing trace with hash -1014372349, now seen corresponding path program 1 times [2019-12-07 12:29:57,204 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-12-07 12:29:57,204 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1058776855] [2019-12-07 12:29:57,205 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 12:29:57,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 12:29:57,256 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 12:29:57,256 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1058776855] [2019-12-07 12:29:57,256 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-12-07 12:29:57,256 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-12-07 12:29:57,257 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [145381832] [2019-12-07 12:29:57,257 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-12-07 12:29:57,257 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-12-07 12:29:57,257 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-12-07 12:29:57,258 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-12-07 12:29:57,258 INFO L87 Difference]: Start difference. First operand 13 states and 15 transitions. Second operand 3 states. [2019-12-07 12:29:57,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 12:29:57,269 INFO L93 Difference]: Finished difference Result 12 states and 14 transitions. [2019-12-07 12:29:57,269 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-12-07 12:29:57,269 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 6 [2019-12-07 12:29:57,269 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 12:29:57,269 INFO L225 Difference]: With dead ends: 12 [2019-12-07 12:29:57,269 INFO L226 Difference]: Without dead ends: 12 [2019-12-07 12:29:57,269 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 12:29:57,270 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2019-12-07 12:29:57,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2019-12-07 12:29:57,270 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2019-12-07 12:29:57,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 14 transitions. [2019-12-07 12:29:57,271 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 14 transitions. Word has length 6 [2019-12-07 12:29:57,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 12:29:57,271 INFO L462 AbstractCegarLoop]: Abstraction has 12 states and 14 transitions. [2019-12-07 12:29:57,271 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-12-07 12:29:57,271 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 14 transitions. [2019-12-07 12:29:57,271 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2019-12-07 12:29:57,271 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 12:29:57,271 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2019-12-07 12:29:57,271 INFO L410 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2019-12-07 12:29:57,272 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 12:29:57,272 INFO L82 PathProgramCache]: Analyzing trace with hash -1014372348, now seen corresponding path program 1 times [2019-12-07 12:29:57,272 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-12-07 12:29:57,272 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [425090196] [2019-12-07 12:29:57,272 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 12:29:57,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 12:29:57,300 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 12:29:57,300 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [425090196] [2019-12-07 12:29:57,301 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-12-07 12:29:57,301 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-12-07 12:29:57,301 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [472393110] [2019-12-07 12:29:57,301 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-12-07 12:29:57,301 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-12-07 12:29:57,301 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-12-07 12:29:57,301 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-12-07 12:29:57,301 INFO L87 Difference]: Start difference. First operand 12 states and 14 transitions. Second operand 4 states. [2019-12-07 12:29:57,322 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 12:29:57,322 INFO L93 Difference]: Finished difference Result 19 states and 22 transitions. [2019-12-07 12:29:57,323 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-12-07 12:29:57,323 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 6 [2019-12-07 12:29:57,323 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 12:29:57,323 INFO L225 Difference]: With dead ends: 19 [2019-12-07 12:29:57,323 INFO L226 Difference]: Without dead ends: 19 [2019-12-07 12:29:57,324 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2019-12-07 12:29:57,324 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2019-12-07 12:29:57,325 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 15. [2019-12-07 12:29:57,325 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2019-12-07 12:29:57,326 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 18 transitions. [2019-12-07 12:29:57,326 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 18 transitions. Word has length 6 [2019-12-07 12:29:57,326 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 12:29:57,326 INFO L462 AbstractCegarLoop]: Abstraction has 15 states and 18 transitions. [2019-12-07 12:29:57,326 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-12-07 12:29:57,326 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 18 transitions. [2019-12-07 12:29:57,327 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2019-12-07 12:29:57,327 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 12:29:57,327 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2019-12-07 12:29:57,327 INFO L410 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2019-12-07 12:29:57,327 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 12:29:57,327 INFO L82 PathProgramCache]: Analyzing trace with hash 145937565, now seen corresponding path program 1 times [2019-12-07 12:29:57,327 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-12-07 12:29:57,328 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [522375690] [2019-12-07 12:29:57,328 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 12:29:57,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 12:29:57,388 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 12:29:57,388 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [522375690] [2019-12-07 12:29:57,388 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-12-07 12:29:57,388 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-12-07 12:29:57,388 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1139566380] [2019-12-07 12:29:57,388 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-12-07 12:29:57,388 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-12-07 12:29:57,389 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-12-07 12:29:57,389 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-12-07 12:29:57,389 INFO L87 Difference]: Start difference. First operand 15 states and 18 transitions. Second operand 5 states. [2019-12-07 12:29:57,423 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 12:29:57,423 INFO L93 Difference]: Finished difference Result 19 states and 21 transitions. [2019-12-07 12:29:57,423 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-12-07 12:29:57,423 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 8 [2019-12-07 12:29:57,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 12:29:57,424 INFO L225 Difference]: With dead ends: 19 [2019-12-07 12:29:57,424 INFO L226 Difference]: Without dead ends: 19 [2019-12-07 12:29:57,424 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2019-12-07 12:29:57,424 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2019-12-07 12:29:57,425 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 15. [2019-12-07 12:29:57,426 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2019-12-07 12:29:57,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2019-12-07 12:29:57,426 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 8 [2019-12-07 12:29:57,426 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 12:29:57,426 INFO L462 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2019-12-07 12:29:57,427 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-12-07 12:29:57,427 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2019-12-07 12:29:57,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2019-12-07 12:29:57,427 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 12:29:57,427 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-12-07 12:29:57,427 INFO L410 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2019-12-07 12:29:57,427 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 12:29:57,427 INFO L82 PathProgramCache]: Analyzing trace with hash 224103215, now seen corresponding path program 1 times [2019-12-07 12:29:57,428 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-12-07 12:29:57,428 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [261203743] [2019-12-07 12:29:57,428 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 12:29:57,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 12:29:57,469 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 12:29:57,470 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [261203743] [2019-12-07 12:29:57,470 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-12-07 12:29:57,470 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-12-07 12:29:57,470 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [448062494] [2019-12-07 12:29:57,471 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-12-07 12:29:57,471 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-12-07 12:29:57,471 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-12-07 12:29:57,471 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-12-07 12:29:57,471 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 4 states. [2019-12-07 12:29:57,480 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 12:29:57,480 INFO L93 Difference]: Finished difference Result 14 states and 16 transitions. [2019-12-07 12:29:57,481 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-12-07 12:29:57,481 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 9 [2019-12-07 12:29:57,481 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 12:29:57,481 INFO L225 Difference]: With dead ends: 14 [2019-12-07 12:29:57,481 INFO L226 Difference]: Without dead ends: 12 [2019-12-07 12:29:57,481 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-12-07 12:29:57,482 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2019-12-07 12:29:57,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2019-12-07 12:29:57,482 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2019-12-07 12:29:57,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 14 transitions. [2019-12-07 12:29:57,483 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 14 transitions. Word has length 9 [2019-12-07 12:29:57,483 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 12:29:57,483 INFO L462 AbstractCegarLoop]: Abstraction has 12 states and 14 transitions. [2019-12-07 12:29:57,483 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-12-07 12:29:57,483 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 14 transitions. [2019-12-07 12:29:57,483 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-12-07 12:29:57,483 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 12:29:57,483 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1] [2019-12-07 12:29:57,484 INFO L410 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2019-12-07 12:29:57,484 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 12:29:57,484 INFO L82 PathProgramCache]: Analyzing trace with hash -1642260829, now seen corresponding path program 1 times [2019-12-07 12:29:57,484 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-12-07 12:29:57,484 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [451241322] [2019-12-07 12:29:57,484 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 12:29:57,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 12:29:57,569 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 12:29:57,569 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [451241322] [2019-12-07 12:29:57,569 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-12-07 12:29:57,569 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-12-07 12:29:57,569 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1867429247] [2019-12-07 12:29:57,570 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-12-07 12:29:57,570 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-12-07 12:29:57,570 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-12-07 12:29:57,570 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2019-12-07 12:29:57,570 INFO L87 Difference]: Start difference. First operand 12 states and 14 transitions. Second operand 6 states. [2019-12-07 12:29:57,656 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 12:29:57,656 INFO L93 Difference]: Finished difference Result 20 states and 21 transitions. [2019-12-07 12:29:57,656 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-12-07 12:29:57,656 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 10 [2019-12-07 12:29:57,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 12:29:57,657 INFO L225 Difference]: With dead ends: 20 [2019-12-07 12:29:57,657 INFO L226 Difference]: Without dead ends: 14 [2019-12-07 12:29:57,657 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2019-12-07 12:29:57,657 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2019-12-07 12:29:57,658 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 13. [2019-12-07 12:29:57,658 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2019-12-07 12:29:57,658 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2019-12-07 12:29:57,658 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 10 [2019-12-07 12:29:57,658 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 12:29:57,658 INFO L462 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2019-12-07 12:29:57,659 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-12-07 12:29:57,659 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2019-12-07 12:29:57,659 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2019-12-07 12:29:57,659 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 12:29:57,659 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2019-12-07 12:29:57,659 INFO L410 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2019-12-07 12:29:57,659 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 12:29:57,659 INFO L82 PathProgramCache]: Analyzing trace with hash 230958607, now seen corresponding path program 1 times [2019-12-07 12:29:57,659 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-12-07 12:29:57,660 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1616591736] [2019-12-07 12:29:57,660 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 12:29:57,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 12:29:57,726 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 12:29:57,726 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1616591736] [2019-12-07 12:29:57,726 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [358100147] [2019-12-07 12:29:57,726 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_8aabcfa5-fb25-40a6-9510-9d72b4068ea0/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 12:29:57,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 12:29:57,760 INFO L264 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 20 conjunts are in the unsatisfiable core [2019-12-07 12:29:57,761 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 12:29:57,781 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 12:29:57,781 INFO L329 TraceCheckSpWp]: Computing backward predicates... [2019-12-07 12:29:57,849 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 12:29:57,849 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2027696424] [2019-12-07 12:29:57,850 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2019-12-07 12:29:57,850 INFO L166 IcfgInterpreter]: Building call graph [2019-12-07 12:29:57,850 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-12-07 12:29:57,850 INFO L176 IcfgInterpreter]: Starting interpretation [2019-12-07 12:29:57,850 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-12-07 12:29:58,149 INFO L180 IcfgInterpreter]: Interpretation finished [2019-12-07 12:29:58,767 WARN L192 SmtUtils]: Spent 268.00 ms on a formula simplification. DAG size of input: 87 DAG size of output: 72 [2019-12-07 12:29:59,160 WARN L192 SmtUtils]: Spent 338.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 81 [2019-12-07 12:29:59,557 WARN L192 SmtUtils]: Spent 333.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 77 [2019-12-07 12:29:59,669 INFO L343 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-12-07 12:29:59,670 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-12-07 12:29:59,670 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 5] total 11 [2019-12-07 12:29:59,670 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1020290337] [2019-12-07 12:29:59,670 INFO L442 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-12-07 12:29:59,670 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-12-07 12:29:59,671 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-12-07 12:29:59,671 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=351, Unknown=0, NotChecked=0, Total=420 [2019-12-07 12:29:59,671 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 13 states. [2019-12-07 12:29:59,832 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 12:29:59,832 INFO L93 Difference]: Finished difference Result 18 states and 19 transitions. [2019-12-07 12:29:59,832 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-12-07 12:29:59,832 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 12 [2019-12-07 12:29:59,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 12:29:59,832 INFO L225 Difference]: With dead ends: 18 [2019-12-07 12:29:59,832 INFO L226 Difference]: Without dead ends: 18 [2019-12-07 12:29:59,833 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 19 SyntacticMatches, 2 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 131 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=134, Invalid=622, Unknown=0, NotChecked=0, Total=756 [2019-12-07 12:29:59,833 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2019-12-07 12:29:59,834 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17. [2019-12-07 12:29:59,834 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2019-12-07 12:29:59,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2019-12-07 12:29:59,834 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 12 [2019-12-07 12:29:59,834 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 12:29:59,834 INFO L462 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2019-12-07 12:29:59,834 INFO L463 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-12-07 12:29:59,835 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2019-12-07 12:29:59,835 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-12-07 12:29:59,835 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 12:29:59,835 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1] [2019-12-07 12:30:00,035 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 12:30:00,036 INFO L410 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2019-12-07 12:30:00,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 12:30:00,037 INFO L82 PathProgramCache]: Analyzing trace with hash -1516021970, now seen corresponding path program 2 times [2019-12-07 12:30:00,037 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-12-07 12:30:00,038 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [991031724] [2019-12-07 12:30:00,038 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 12:30:00,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 12:30:00,255 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 6 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 12:30:00,256 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [991031724] [2019-12-07 12:30:00,256 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [43314167] [2019-12-07 12:30:00,256 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_8aabcfa5-fb25-40a6-9510-9d72b4068ea0/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 12:30:00,290 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-12-07 12:30:00,290 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-12-07 12:30:00,291 INFO L264 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 28 conjunts are in the unsatisfiable core [2019-12-07 12:30:00,292 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 12:30:00,394 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 6 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 12:30:00,394 INFO L329 TraceCheckSpWp]: Computing backward predicates... [2019-12-07 12:30:00,484 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 6 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 12:30:00,484 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [954114442] [2019-12-07 12:30:00,485 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2019-12-07 12:30:00,485 INFO L166 IcfgInterpreter]: Building call graph [2019-12-07 12:30:00,485 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-12-07 12:30:00,485 INFO L176 IcfgInterpreter]: Starting interpretation [2019-12-07 12:30:00,486 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-12-07 12:30:00,595 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 12:30:00,608 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 12:30:00,788 INFO L180 IcfgInterpreter]: Interpretation finished [2019-12-07 12:30:01,417 WARN L192 SmtUtils]: Spent 276.00 ms on a formula simplification. DAG size of input: 87 DAG size of output: 72 [2019-12-07 12:30:01,826 WARN L192 SmtUtils]: Spent 340.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 81 [2019-12-07 12:30:02,241 WARN L192 SmtUtils]: Spent 325.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 77 [2019-12-07 12:30:02,350 INFO L343 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-12-07 12:30:02,351 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-12-07 12:30:02,351 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 20 [2019-12-07 12:30:02,351 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2143891187] [2019-12-07 12:30:02,351 INFO L442 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-12-07 12:30:02,351 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-12-07 12:30:02,352 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-12-07 12:30:02,352 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=721, Unknown=0, NotChecked=0, Total=812 [2019-12-07 12:30:02,352 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand 21 states. [2019-12-07 12:30:02,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 12:30:02,577 INFO L93 Difference]: Finished difference Result 29 states and 30 transitions. [2019-12-07 12:30:02,577 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-12-07 12:30:02,577 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 16 [2019-12-07 12:30:02,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 12:30:02,577 INFO L225 Difference]: With dead ends: 29 [2019-12-07 12:30:02,577 INFO L226 Difference]: Without dead ends: 20 [2019-12-07 12:30:02,578 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 26 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 2 DeprecatedPredicates, 312 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=170, Invalid=1090, Unknown=0, NotChecked=0, Total=1260 [2019-12-07 12:30:02,578 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2019-12-07 12:30:02,579 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 19. [2019-12-07 12:30:02,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2019-12-07 12:30:02,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2019-12-07 12:30:02,579 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 16 [2019-12-07 12:30:02,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 12:30:02,580 INFO L462 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2019-12-07 12:30:02,580 INFO L463 AbstractCegarLoop]: Interpolant automaton has 21 states. [2019-12-07 12:30:02,580 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2019-12-07 12:30:02,580 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2019-12-07 12:30:02,580 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 12:30:02,580 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1] [2019-12-07 12:30:02,781 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 12:30:02,782 INFO L410 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2019-12-07 12:30:02,782 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 12:30:02,782 INFO L82 PathProgramCache]: Analyzing trace with hash 1252271514, now seen corresponding path program 3 times [2019-12-07 12:30:02,783 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-12-07 12:30:02,783 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [493569445] [2019-12-07 12:30:02,783 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 12:30:02,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 12:30:02,876 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 12:30:02,876 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [493569445] [2019-12-07 12:30:02,876 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [277978683] [2019-12-07 12:30:02,876 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_8aabcfa5-fb25-40a6-9510-9d72b4068ea0/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 12:30:02,907 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-12-07 12:30:02,907 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-12-07 12:30:02,908 INFO L264 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 27 conjunts are in the unsatisfiable core [2019-12-07 12:30:02,909 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 12:30:02,998 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 1 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 12:30:02,998 INFO L329 TraceCheckSpWp]: Computing backward predicates... [2019-12-07 12:30:03,100 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 4 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 12:30:03,100 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [944630260] [2019-12-07 12:30:03,101 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2019-12-07 12:30:03,101 INFO L166 IcfgInterpreter]: Building call graph [2019-12-07 12:30:03,101 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-12-07 12:30:03,101 INFO L176 IcfgInterpreter]: Starting interpretation [2019-12-07 12:30:03,101 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-12-07 12:30:03,167 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 12:30:03,315 INFO L180 IcfgInterpreter]: Interpretation finished [2019-12-07 12:30:03,960 WARN L192 SmtUtils]: Spent 273.00 ms on a formula simplification. DAG size of input: 87 DAG size of output: 72 [2019-12-07 12:30:04,381 WARN L192 SmtUtils]: Spent 342.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 81 [2019-12-07 12:30:04,769 WARN L192 SmtUtils]: Spent 307.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 77 [2019-12-07 12:30:04,877 INFO L343 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-12-07 12:30:04,877 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-12-07 12:30:04,877 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 21 [2019-12-07 12:30:04,877 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1938913387] [2019-12-07 12:30:04,877 INFO L442 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-12-07 12:30:04,878 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-12-07 12:30:04,878 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-12-07 12:30:04,878 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=812, Unknown=0, NotChecked=0, Total=930 [2019-12-07 12:30:04,878 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand 23 states. [2019-12-07 12:30:05,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 12:30:05,050 INFO L93 Difference]: Finished difference Result 24 states and 25 transitions. [2019-12-07 12:30:05,050 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-12-07 12:30:05,050 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 18 [2019-12-07 12:30:05,050 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 12:30:05,050 INFO L225 Difference]: With dead ends: 24 [2019-12-07 12:30:05,050 INFO L226 Difference]: Without dead ends: 24 [2019-12-07 12:30:05,051 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 308 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=212, Invalid=1120, Unknown=0, NotChecked=0, Total=1332 [2019-12-07 12:30:05,051 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2019-12-07 12:30:05,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2019-12-07 12:30:05,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2019-12-07 12:30:05,053 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2019-12-07 12:30:05,053 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 18 [2019-12-07 12:30:05,053 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 12:30:05,053 INFO L462 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2019-12-07 12:30:05,053 INFO L463 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-12-07 12:30:05,053 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2019-12-07 12:30:05,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2019-12-07 12:30:05,054 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 12:30:05,054 INFO L410 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 2, 2, 1, 1, 1, 1] [2019-12-07 12:30:05,254 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 12:30:05,255 INFO L410 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2019-12-07 12:30:05,256 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 12:30:05,256 INFO L82 PathProgramCache]: Analyzing trace with hash 1813158201, now seen corresponding path program 4 times [2019-12-07 12:30:05,256 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-12-07 12:30:05,257 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [552664182] [2019-12-07 12:30:05,257 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 12:30:05,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 12:30:05,363 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 9 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 12:30:05,364 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [552664182] [2019-12-07 12:30:05,364 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1733811447] [2019-12-07 12:30:05,364 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_8aabcfa5-fb25-40a6-9510-9d72b4068ea0/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 12:30:05,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 12:30:05,396 INFO L264 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 34 conjunts are in the unsatisfiable core [2019-12-07 12:30:05,397 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 12:30:05,455 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 9 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 12:30:05,456 INFO L329 TraceCheckSpWp]: Computing backward predicates... [2019-12-07 12:30:05,509 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 9 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 12:30:05,510 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [21465027] [2019-12-07 12:30:05,510 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2019-12-07 12:30:05,510 INFO L166 IcfgInterpreter]: Building call graph [2019-12-07 12:30:05,511 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-12-07 12:30:05,511 INFO L176 IcfgInterpreter]: Starting interpretation [2019-12-07 12:30:05,511 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-12-07 12:30:05,577 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 12:30:05,765 INFO L180 IcfgInterpreter]: Interpretation finished [2019-12-07 12:30:06,768 WARN L192 SmtUtils]: Spent 670.00 ms on a formula simplification. DAG size of input: 87 DAG size of output: 72 [2019-12-07 12:30:07,215 WARN L192 SmtUtils]: Spent 342.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 81 [2019-12-07 12:30:07,628 WARN L192 SmtUtils]: Spent 333.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 77 [2019-12-07 12:30:07,732 INFO L343 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-12-07 12:30:07,732 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-12-07 12:30:07,732 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 14 [2019-12-07 12:30:07,733 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [715009610] [2019-12-07 12:30:07,733 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-12-07 12:30:07,733 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-12-07 12:30:07,733 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-12-07 12:30:07,733 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=436, Unknown=0, NotChecked=0, Total=506 [2019-12-07 12:30:07,733 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand 15 states. [2019-12-07 12:30:07,874 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 12:30:07,874 INFO L93 Difference]: Finished difference Result 39 states and 40 transitions. [2019-12-07 12:30:07,874 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2019-12-07 12:30:07,874 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 22 [2019-12-07 12:30:07,875 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 12:30:07,875 INFO L225 Difference]: With dead ends: 39 [2019-12-07 12:30:07,875 INFO L226 Difference]: Without dead ends: 26 [2019-12-07 12:30:07,875 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 47 SyntacticMatches, 6 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 141 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=115, Invalid=697, Unknown=0, NotChecked=0, Total=812 [2019-12-07 12:30:07,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2019-12-07 12:30:07,877 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2019-12-07 12:30:07,877 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2019-12-07 12:30:07,877 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2019-12-07 12:30:07,877 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 22 [2019-12-07 12:30:07,877 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 12:30:07,877 INFO L462 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2019-12-07 12:30:07,877 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-12-07 12:30:07,877 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2019-12-07 12:30:07,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2019-12-07 12:30:07,878 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 12:30:07,878 INFO L410 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1] [2019-12-07 12:30:08,078 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 12:30:08,079 INFO L410 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2019-12-07 12:30:08,080 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 12:30:08,080 INFO L82 PathProgramCache]: Analyzing trace with hash -438180187, now seen corresponding path program 5 times [2019-12-07 12:30:08,080 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-12-07 12:30:08,081 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [595808119] [2019-12-07 12:30:08,081 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 12:30:08,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 12:30:08,172 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 1 proven. 29 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 12:30:08,173 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [595808119] [2019-12-07 12:30:08,173 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [209008896] [2019-12-07 12:30:08,173 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_8aabcfa5-fb25-40a6-9510-9d72b4068ea0/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 12:30:08,210 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2019-12-07 12:30:08,210 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-12-07 12:30:08,211 INFO L264 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 28 conjunts are in the unsatisfiable core [2019-12-07 12:30:08,212 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 12:30:08,300 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 4 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 12:30:08,300 INFO L329 TraceCheckSpWp]: Computing backward predicates... [2019-12-07 12:30:08,415 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 4 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 12:30:08,415 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [4028209] [2019-12-07 12:30:08,416 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2019-12-07 12:30:08,416 INFO L166 IcfgInterpreter]: Building call graph [2019-12-07 12:30:08,416 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-12-07 12:30:08,416 INFO L176 IcfgInterpreter]: Starting interpretation [2019-12-07 12:30:08,416 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-12-07 12:30:08,636 INFO L180 IcfgInterpreter]: Interpretation finished [2019-12-07 12:30:09,251 WARN L192 SmtUtils]: Spent 267.00 ms on a formula simplification. DAG size of input: 87 DAG size of output: 72 [2019-12-07 12:30:09,654 WARN L192 SmtUtils]: Spent 333.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 81 [2019-12-07 12:30:10,040 WARN L192 SmtUtils]: Spent 313.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 77 [2019-12-07 12:30:10,317 WARN L192 SmtUtils]: Spent 199.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 46 [2019-12-07 12:30:10,319 INFO L343 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-12-07 12:30:10,319 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-12-07 12:30:10,319 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 22 [2019-12-07 12:30:10,319 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [475399126] [2019-12-07 12:30:10,320 INFO L442 AbstractCegarLoop]: Interpolant automaton has 24 states [2019-12-07 12:30:10,320 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-12-07 12:30:10,321 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2019-12-07 12:30:10,322 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=861, Unknown=0, NotChecked=0, Total=992 [2019-12-07 12:30:10,322 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand 24 states. [2019-12-07 12:30:11,702 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 12:30:11,703 INFO L93 Difference]: Finished difference Result 30 states and 31 transitions. [2019-12-07 12:30:11,704 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-12-07 12:30:11,704 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 24 [2019-12-07 12:30:11,705 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 12:30:11,705 INFO L225 Difference]: With dead ends: 30 [2019-12-07 12:30:11,706 INFO L226 Difference]: Without dead ends: 30 [2019-12-07 12:30:11,708 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 45 SyntacticMatches, 4 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 392 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=290, Invalid=1432, Unknown=0, NotChecked=0, Total=1722 [2019-12-07 12:30:11,708 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2019-12-07 12:30:11,712 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2019-12-07 12:30:11,713 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2019-12-07 12:30:11,713 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2019-12-07 12:30:11,714 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 24 [2019-12-07 12:30:11,714 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 12:30:11,715 INFO L462 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2019-12-07 12:30:11,715 INFO L463 AbstractCegarLoop]: Interpolant automaton has 24 states. [2019-12-07 12:30:11,715 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2019-12-07 12:30:11,717 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2019-12-07 12:30:11,717 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 12:30:11,717 INFO L410 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 3, 3, 1, 1, 1, 1] [2019-12-07 12:30:11,918 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 12:30:11,919 INFO L410 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2019-12-07 12:30:11,919 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 12:30:11,920 INFO L82 PathProgramCache]: Analyzing trace with hash -1054679868, now seen corresponding path program 6 times [2019-12-07 12:30:11,920 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-12-07 12:30:11,920 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [575242327] [2019-12-07 12:30:11,921 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 12:30:11,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 12:30:12,054 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 12 proven. 33 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 12:30:12,054 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [575242327] [2019-12-07 12:30:12,054 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1640779766] [2019-12-07 12:30:12,055 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_8aabcfa5-fb25-40a6-9510-9d72b4068ea0/bin/utaipan/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 12:30:12,089 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-12-07 12:30:12,089 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-12-07 12:30:12,090 INFO L264 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 41 conjunts are in the unsatisfiable core [2019-12-07 12:30:12,092 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 12:30:12,356 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 15 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 12:30:12,356 INFO L329 TraceCheckSpWp]: Computing backward predicates... [2019-12-07 12:30:12,563 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 16 proven. 29 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 12:30:12,563 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1389488550] [2019-12-07 12:30:12,564 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2019-12-07 12:30:12,564 INFO L166 IcfgInterpreter]: Building call graph [2019-12-07 12:30:12,564 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-12-07 12:30:12,564 INFO L176 IcfgInterpreter]: Starting interpretation [2019-12-07 12:30:12,564 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-12-07 12:30:12,652 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 12:30:12,664 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 12:30:12,828 INFO L180 IcfgInterpreter]: Interpretation finished [2019-12-07 12:30:13,495 WARN L192 SmtUtils]: Spent 267.00 ms on a formula simplification. DAG size of input: 87 DAG size of output: 72 [2019-12-07 12:30:13,911 WARN L192 SmtUtils]: Spent 327.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 81 [2019-12-07 12:30:14,299 WARN L192 SmtUtils]: Spent 293.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 77 [2019-12-07 12:30:14,420 INFO L343 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-12-07 12:30:14,420 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-12-07 12:30:14,420 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 31 [2019-12-07 12:30:14,420 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1877073447] [2019-12-07 12:30:14,421 INFO L442 AbstractCegarLoop]: Interpolant automaton has 32 states [2019-12-07 12:30:14,421 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-12-07 12:30:14,421 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2019-12-07 12:30:14,421 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=1425, Unknown=0, NotChecked=0, Total=1560 [2019-12-07 12:30:14,421 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand 32 states. [2019-12-07 12:30:14,903 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 12:30:14,903 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2019-12-07 12:30:14,903 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-12-07 12:30:14,903 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 28 [2019-12-07 12:30:14,904 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 12:30:14,904 INFO L225 Difference]: With dead ends: 49 [2019-12-07 12:30:14,904 INFO L226 Difference]: Without dead ends: 32 [2019-12-07 12:30:14,905 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 54 SyntacticMatches, 3 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 3 DeprecatedPredicates, 576 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=289, Invalid=2467, Unknown=0, NotChecked=0, Total=2756 [2019-12-07 12:30:14,905 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2019-12-07 12:30:14,907 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2019-12-07 12:30:14,907 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2019-12-07 12:30:14,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2019-12-07 12:30:14,908 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 28 [2019-12-07 12:30:14,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 12:30:14,908 INFO L462 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2019-12-07 12:30:14,908 INFO L463 AbstractCegarLoop]: Interpolant automaton has 32 states. [2019-12-07 12:30:14,908 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2019-12-07 12:30:14,909 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2019-12-07 12:30:14,909 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 12:30:14,909 INFO L410 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1] [2019-12-07 12:30:15,109 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 12:30:15,110 INFO L410 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2019-12-07 12:30:15,111 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 12:30:15,111 INFO L82 PathProgramCache]: Analyzing trace with hash -190486224, now seen corresponding path program 7 times [2019-12-07 12:30:15,111 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-12-07 12:30:15,112 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [882168666] [2019-12-07 12:30:15,112 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 12:30:15,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 12:30:15,223 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 4 proven. 48 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 12:30:15,223 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [882168666] [2019-12-07 12:30:15,224 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1331154979] [2019-12-07 12:30:15,224 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_8aabcfa5-fb25-40a6-9510-9d72b4068ea0/bin/utaipan/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 12:30:15,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 12:30:15,259 INFO L264 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 35 conjunts are in the unsatisfiable core [2019-12-07 12:30:15,261 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 12:30:15,318 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 9 proven. 43 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 12:30:15,318 INFO L329 TraceCheckSpWp]: Computing backward predicates... [2019-12-07 12:30:15,480 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 9 proven. 43 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 12:30:15,480 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [205208350] [2019-12-07 12:30:15,481 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2019-12-07 12:30:15,481 INFO L166 IcfgInterpreter]: Building call graph [2019-12-07 12:30:15,481 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-12-07 12:30:15,481 INFO L176 IcfgInterpreter]: Starting interpretation [2019-12-07 12:30:15,481 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-12-07 12:30:15,685 INFO L180 IcfgInterpreter]: Interpretation finished [2019-12-07 12:30:16,500 WARN L192 SmtUtils]: Spent 434.00 ms on a formula simplification. DAG size of input: 87 DAG size of output: 72 [2019-12-07 12:30:17,387 WARN L192 SmtUtils]: Spent 713.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 81 [2019-12-07 12:30:18,005 WARN L192 SmtUtils]: Spent 449.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 77 [2019-12-07 12:30:18,125 INFO L343 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-12-07 12:30:18,125 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-12-07 12:30:18,125 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 22 [2019-12-07 12:30:18,125 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1198613016] [2019-12-07 12:30:18,126 INFO L442 AbstractCegarLoop]: Interpolant automaton has 24 states [2019-12-07 12:30:18,126 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-12-07 12:30:18,126 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2019-12-07 12:30:18,126 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=880, Unknown=0, NotChecked=0, Total=992 [2019-12-07 12:30:18,126 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand 24 states. [2019-12-07 12:30:18,486 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 12:30:18,486 INFO L93 Difference]: Finished difference Result 36 states and 37 transitions. [2019-12-07 12:30:18,486 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-12-07 12:30:18,487 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 30 [2019-12-07 12:30:18,487 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 12:30:18,487 INFO L225 Difference]: With dead ends: 36 [2019-12-07 12:30:18,487 INFO L226 Difference]: Without dead ends: 36 [2019-12-07 12:30:18,488 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 64 SyntacticMatches, 5 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 370 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=312, Invalid=1580, Unknown=0, NotChecked=0, Total=1892 [2019-12-07 12:30:18,488 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2019-12-07 12:30:18,489 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2019-12-07 12:30:18,489 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2019-12-07 12:30:18,489 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2019-12-07 12:30:18,489 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 30 [2019-12-07 12:30:18,490 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 12:30:18,490 INFO L462 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2019-12-07 12:30:18,490 INFO L463 AbstractCegarLoop]: Interpolant automaton has 24 states. [2019-12-07 12:30:18,490 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2019-12-07 12:30:18,490 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2019-12-07 12:30:18,490 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 12:30:18,490 INFO L410 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 4, 4, 1, 1, 1, 1] [2019-12-07 12:30:18,691 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 12:30:18,692 INFO L410 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2019-12-07 12:30:18,692 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 12:30:18,692 INFO L82 PathProgramCache]: Analyzing trace with hash -436461105, now seen corresponding path program 8 times [2019-12-07 12:30:18,693 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-12-07 12:30:18,693 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [76103949] [2019-12-07 12:30:18,693 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 12:30:18,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 12:30:18,842 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 15 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 12:30:18,842 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [76103949] [2019-12-07 12:30:18,842 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1522263705] [2019-12-07 12:30:18,842 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_8aabcfa5-fb25-40a6-9510-9d72b4068ea0/bin/utaipan/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 12:30:18,888 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2019-12-07 12:30:18,888 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-12-07 12:30:18,889 INFO L264 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 46 conjunts are in the unsatisfiable core [2019-12-07 12:30:18,891 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 12:30:18,941 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 15 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 12:30:18,941 INFO L329 TraceCheckSpWp]: Computing backward predicates... [2019-12-07 12:30:19,001 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 15 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 12:30:19,001 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2063959314] [2019-12-07 12:30:19,002 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2019-12-07 12:30:19,002 INFO L166 IcfgInterpreter]: Building call graph [2019-12-07 12:30:19,002 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-12-07 12:30:19,003 INFO L176 IcfgInterpreter]: Starting interpretation [2019-12-07 12:30:19,003 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-12-07 12:30:19,078 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 12:30:19,228 INFO L180 IcfgInterpreter]: Interpretation finished [2019-12-07 12:30:19,850 WARN L192 SmtUtils]: Spent 272.00 ms on a formula simplification. DAG size of input: 87 DAG size of output: 72 [2019-12-07 12:30:20,289 WARN L192 SmtUtils]: Spent 367.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 81 [2019-12-07 12:30:20,698 WARN L192 SmtUtils]: Spent 330.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 77 [2019-12-07 12:30:20,800 INFO L343 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-12-07 12:30:20,800 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-12-07 12:30:20,800 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 18 [2019-12-07 12:30:20,801 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [862760078] [2019-12-07 12:30:20,801 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-12-07 12:30:20,801 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-12-07 12:30:20,801 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-12-07 12:30:20,802 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=624, Unknown=0, NotChecked=0, Total=702 [2019-12-07 12:30:20,802 INFO L87 Difference]: Start difference. First operand 35 states and 36 transitions. Second operand 19 states. [2019-12-07 12:30:21,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 12:30:21,058 INFO L93 Difference]: Finished difference Result 59 states and 60 transitions. [2019-12-07 12:30:21,058 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-12-07 12:30:21,058 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 34 [2019-12-07 12:30:21,059 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 12:30:21,059 INFO L225 Difference]: With dead ends: 59 [2019-12-07 12:30:21,059 INFO L226 Difference]: Without dead ends: 38 [2019-12-07 12:30:21,059 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 83 SyntacticMatches, 6 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 199 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=147, Invalid=1185, Unknown=0, NotChecked=0, Total=1332 [2019-12-07 12:30:21,059 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2019-12-07 12:30:21,061 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2019-12-07 12:30:21,061 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2019-12-07 12:30:21,061 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 38 transitions. [2019-12-07 12:30:21,061 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 38 transitions. Word has length 34 [2019-12-07 12:30:21,061 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 12:30:21,061 INFO L462 AbstractCegarLoop]: Abstraction has 37 states and 38 transitions. [2019-12-07 12:30:21,061 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-12-07 12:30:21,061 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 38 transitions. [2019-12-07 12:30:21,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2019-12-07 12:30:21,062 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 12:30:21,062 INFO L410 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1] [2019-12-07 12:30:21,262 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 12:30:21,263 INFO L410 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2019-12-07 12:30:21,264 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 12:30:21,264 INFO L82 PathProgramCache]: Analyzing trace with hash 696692027, now seen corresponding path program 9 times [2019-12-07 12:30:21,264 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-12-07 12:30:21,265 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2109647595] [2019-12-07 12:30:21,265 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 12:30:21,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 12:30:21,396 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 9 proven. 71 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 12:30:21,396 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2109647595] [2019-12-07 12:30:21,396 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [368499224] [2019-12-07 12:30:21,396 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_8aabcfa5-fb25-40a6-9510-9d72b4068ea0/bin/utaipan/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 12:30:21,448 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-12-07 12:30:21,448 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-12-07 12:30:21,450 INFO L264 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 42 conjunts are in the unsatisfiable core [2019-12-07 12:30:21,451 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 12:30:21,702 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 16 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 12:30:21,702 INFO L329 TraceCheckSpWp]: Computing backward predicates... [2019-12-07 12:30:21,985 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 25 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 12:30:21,985 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [406365409] [2019-12-07 12:30:21,985 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2019-12-07 12:30:21,986 INFO L166 IcfgInterpreter]: Building call graph [2019-12-07 12:30:21,986 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-12-07 12:30:21,986 INFO L176 IcfgInterpreter]: Starting interpretation [2019-12-07 12:30:21,986 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-12-07 12:30:22,064 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 12:30:22,219 INFO L180 IcfgInterpreter]: Interpretation finished [2019-12-07 12:30:22,998 WARN L192 SmtUtils]: Spent 302.00 ms on a formula simplification. DAG size of input: 87 DAG size of output: 72 [2019-12-07 12:30:24,496 WARN L192 SmtUtils]: Spent 1.30 s on a formula simplification. DAG size of input: 96 DAG size of output: 81 [2019-12-07 12:30:25,654 WARN L192 SmtUtils]: Spent 922.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 77 [2019-12-07 12:30:25,834 INFO L343 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-12-07 12:30:25,834 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-12-07 12:30:25,834 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 39 [2019-12-07 12:30:25,835 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1186137015] [2019-12-07 12:30:25,835 INFO L442 AbstractCegarLoop]: Interpolant automaton has 41 states [2019-12-07 12:30:25,835 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-12-07 12:30:25,835 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2019-12-07 12:30:25,836 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=259, Invalid=2093, Unknown=0, NotChecked=0, Total=2352 [2019-12-07 12:30:25,836 INFO L87 Difference]: Start difference. First operand 37 states and 38 transitions. Second operand 41 states. [2019-12-07 12:30:26,206 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 12:30:26,206 INFO L93 Difference]: Finished difference Result 42 states and 43 transitions. [2019-12-07 12:30:26,207 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2019-12-07 12:30:26,207 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 36 [2019-12-07 12:30:26,207 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 12:30:26,207 INFO L225 Difference]: With dead ends: 42 [2019-12-07 12:30:26,207 INFO L226 Difference]: Without dead ends: 42 [2019-12-07 12:30:26,208 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 72 SyntacticMatches, 0 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 860 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=494, Invalid=2812, Unknown=0, NotChecked=0, Total=3306 [2019-12-07 12:30:26,208 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2019-12-07 12:30:26,209 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2019-12-07 12:30:26,209 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2019-12-07 12:30:26,210 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 42 transitions. [2019-12-07 12:30:26,210 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 42 transitions. Word has length 36 [2019-12-07 12:30:26,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 12:30:26,210 INFO L462 AbstractCegarLoop]: Abstraction has 41 states and 42 transitions. [2019-12-07 12:30:26,210 INFO L463 AbstractCegarLoop]: Interpolant automaton has 41 states. [2019-12-07 12:30:26,210 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 42 transitions. [2019-12-07 12:30:26,211 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2019-12-07 12:30:26,211 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 12:30:26,211 INFO L410 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 5, 5, 1, 1, 1, 1] [2019-12-07 12:30:26,411 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 12:30:26,412 INFO L410 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2019-12-07 12:30:26,412 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 12:30:26,412 INFO L82 PathProgramCache]: Analyzing trace with hash -2127140774, now seen corresponding path program 10 times [2019-12-07 12:30:26,412 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-12-07 12:30:26,412 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [668230583] [2019-12-07 12:30:26,412 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 12:30:26,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 12:30:26,603 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 18 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 12:30:26,603 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [668230583] [2019-12-07 12:30:26,604 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1477433180] [2019-12-07 12:30:26,604 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_8aabcfa5-fb25-40a6-9510-9d72b4068ea0/bin/utaipan/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 12:30:26,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 12:30:26,663 INFO L264 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 52 conjunts are in the unsatisfiable core [2019-12-07 12:30:26,664 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 12:30:26,994 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 18 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 12:30:26,994 INFO L329 TraceCheckSpWp]: Computing backward predicates... [2019-12-07 12:30:27,289 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 18 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 12:30:27,290 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1229242783] [2019-12-07 12:30:27,291 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2019-12-07 12:30:27,291 INFO L166 IcfgInterpreter]: Building call graph [2019-12-07 12:30:27,291 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-12-07 12:30:27,291 INFO L176 IcfgInterpreter]: Starting interpretation [2019-12-07 12:30:27,291 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-12-07 12:30:27,381 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 12:30:27,394 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 12:30:27,539 INFO L180 IcfgInterpreter]: Interpretation finished [2019-12-07 12:30:28,535 WARN L192 SmtUtils]: Spent 555.00 ms on a formula simplification. DAG size of input: 87 DAG size of output: 72 [2019-12-07 12:30:29,261 WARN L192 SmtUtils]: Spent 495.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 81 [2019-12-07 12:30:30,793 WARN L192 SmtUtils]: Spent 1.26 s on a formula simplification. DAG size of input: 96 DAG size of output: 77 [2019-12-07 12:30:30,946 INFO L343 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-12-07 12:30:30,946 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-12-07 12:30:30,946 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 17, 17] total 39 [2019-12-07 12:30:30,946 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [692958872] [2019-12-07 12:30:30,947 INFO L442 AbstractCegarLoop]: Interpolant automaton has 40 states [2019-12-07 12:30:30,947 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-12-07 12:30:30,947 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2019-12-07 12:30:30,948 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=145, Invalid=2111, Unknown=0, NotChecked=0, Total=2256 [2019-12-07 12:30:30,948 INFO L87 Difference]: Start difference. First operand 41 states and 42 transitions. Second operand 40 states. [2019-12-07 12:30:32,349 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 12:30:32,349 INFO L93 Difference]: Finished difference Result 69 states and 70 transitions. [2019-12-07 12:30:32,349 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2019-12-07 12:30:32,350 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 40 [2019-12-07 12:30:32,350 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 12:30:32,350 INFO L225 Difference]: With dead ends: 69 [2019-12-07 12:30:32,350 INFO L226 Difference]: Without dead ends: 44 [2019-12-07 12:30:32,351 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 783 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=279, Invalid=3381, Unknown=0, NotChecked=0, Total=3660 [2019-12-07 12:30:32,351 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2019-12-07 12:30:32,352 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2019-12-07 12:30:32,352 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2019-12-07 12:30:32,353 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2019-12-07 12:30:32,353 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 40 [2019-12-07 12:30:32,353 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 12:30:32,353 INFO L462 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2019-12-07 12:30:32,353 INFO L463 AbstractCegarLoop]: Interpolant automaton has 40 states. [2019-12-07 12:30:32,353 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2019-12-07 12:30:32,353 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2019-12-07 12:30:32,354 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 12:30:32,354 INFO L410 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 1, 1, 1, 1] [2019-12-07 12:30:32,554 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 12:30:32,555 INFO L410 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2019-12-07 12:30:32,555 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 12:30:32,555 INFO L82 PathProgramCache]: Analyzing trace with hash -930237754, now seen corresponding path program 11 times [2019-12-07 12:30:32,555 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-12-07 12:30:32,555 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1561797583] [2019-12-07 12:30:32,556 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 12:30:32,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 12:30:32,727 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 16 proven. 98 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 12:30:32,727 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1561797583] [2019-12-07 12:30:32,727 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [359709424] [2019-12-07 12:30:32,727 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_8aabcfa5-fb25-40a6-9510-9d72b4068ea0/bin/utaipan/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 12:30:32,789 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2019-12-07 12:30:32,789 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-12-07 12:30:32,791 INFO L264 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 42 conjunts are in the unsatisfiable core [2019-12-07 12:30:32,792 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 12:30:33,066 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 25 proven. 89 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 12:30:33,066 INFO L329 TraceCheckSpWp]: Computing backward predicates... [2019-12-07 12:30:33,440 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 36 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 12:30:33,440 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2045556627] [2019-12-07 12:30:33,441 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2019-12-07 12:30:33,441 INFO L166 IcfgInterpreter]: Building call graph [2019-12-07 12:30:33,441 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-12-07 12:30:33,441 INFO L176 IcfgInterpreter]: Starting interpretation [2019-12-07 12:30:33,442 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-12-07 12:30:33,586 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 12:30:33,621 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 12:30:33,727 INFO L180 IcfgInterpreter]: Interpretation finished [2019-12-07 12:30:34,141 WARN L192 SmtUtils]: Spent 192.00 ms on a formula simplification. DAG size of input: 82 DAG size of output: 66 [2019-12-07 12:30:34,521 WARN L192 SmtUtils]: Spent 196.00 ms on a formula simplification. DAG size of input: 84 DAG size of output: 68 [2019-12-07 12:30:34,982 INFO L343 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-12-07 12:30:34,982 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-12-07 12:30:34,982 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 45 [2019-12-07 12:30:34,982 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2097003988] [2019-12-07 12:30:34,982 INFO L442 AbstractCegarLoop]: Interpolant automaton has 47 states [2019-12-07 12:30:34,983 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-12-07 12:30:34,983 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2019-12-07 12:30:34,983 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=337, Invalid=2525, Unknown=0, NotChecked=0, Total=2862 [2019-12-07 12:30:34,983 INFO L87 Difference]: Start difference. First operand 43 states and 44 transitions. Second operand 47 states. [2019-12-07 12:30:35,457 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 12:30:35,457 INFO L93 Difference]: Finished difference Result 48 states and 49 transitions. [2019-12-07 12:30:35,458 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-12-07 12:30:35,458 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 42 [2019-12-07 12:30:35,458 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 12:30:35,458 INFO L225 Difference]: With dead ends: 48 [2019-12-07 12:30:35,458 INFO L226 Difference]: Without dead ends: 48 [2019-12-07 12:30:35,459 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 87 SyntacticMatches, 0 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 974 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=673, Invalid=3359, Unknown=0, NotChecked=0, Total=4032 [2019-12-07 12:30:35,459 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2019-12-07 12:30:35,461 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 47. [2019-12-07 12:30:35,461 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2019-12-07 12:30:35,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 48 transitions. [2019-12-07 12:30:35,461 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 48 transitions. Word has length 42 [2019-12-07 12:30:35,461 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 12:30:35,461 INFO L462 AbstractCegarLoop]: Abstraction has 47 states and 48 transitions. [2019-12-07 12:30:35,461 INFO L463 AbstractCegarLoop]: Interpolant automaton has 47 states. [2019-12-07 12:30:35,462 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 48 transitions. [2019-12-07 12:30:35,462 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2019-12-07 12:30:35,462 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 12:30:35,462 INFO L410 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 6, 6, 1, 1, 1, 1] [2019-12-07 12:30:35,662 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 12:30:35,663 INFO L410 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2019-12-07 12:30:35,663 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 12:30:35,664 INFO L82 PathProgramCache]: Analyzing trace with hash -1831227291, now seen corresponding path program 12 times [2019-12-07 12:30:35,664 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-12-07 12:30:35,664 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [669190994] [2019-12-07 12:30:35,664 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 12:30:35,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 12:30:35,900 INFO L134 CoverageAnalysis]: Checked inductivity of 141 backedges. 21 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 12:30:35,900 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [669190994] [2019-12-07 12:30:35,900 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [659424209] [2019-12-07 12:30:35,900 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_8aabcfa5-fb25-40a6-9510-9d72b4068ea0/bin/utaipan/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 12:30:35,947 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-12-07 12:30:35,947 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-12-07 12:30:35,949 INFO L264 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 56 conjunts are in the unsatisfiable core [2019-12-07 12:30:35,950 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 12:30:36,120 INFO L134 CoverageAnalysis]: Checked inductivity of 141 backedges. 21 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 12:30:36,120 INFO L329 TraceCheckSpWp]: Computing backward predicates... [2019-12-07 12:30:36,288 INFO L134 CoverageAnalysis]: Checked inductivity of 141 backedges. 21 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 12:30:36,288 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [281774058] [2019-12-07 12:30:36,289 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2019-12-07 12:30:36,289 INFO L166 IcfgInterpreter]: Building call graph [2019-12-07 12:30:36,289 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-12-07 12:30:36,289 INFO L176 IcfgInterpreter]: Starting interpretation [2019-12-07 12:30:36,289 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-12-07 12:30:36,442 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 12:30:36,465 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 12:30:36,571 INFO L180 IcfgInterpreter]: Interpretation finished [2019-12-07 12:30:36,979 WARN L192 SmtUtils]: Spent 190.00 ms on a formula simplification. DAG size of input: 82 DAG size of output: 66 [2019-12-07 12:30:37,428 WARN L192 SmtUtils]: Spent 264.00 ms on a formula simplification. DAG size of input: 84 DAG size of output: 68 [2019-12-07 12:30:37,968 WARN L192 SmtUtils]: Spent 302.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 46 [2019-12-07 12:30:38,481 WARN L192 SmtUtils]: Spent 286.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 55 [2019-12-07 12:30:38,954 WARN L192 SmtUtils]: Spent 251.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 51 [2019-12-07 12:30:38,956 INFO L343 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-12-07 12:30:38,957 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-12-07 12:30:38,957 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 18] total 30 [2019-12-07 12:30:38,957 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [791630982] [2019-12-07 12:30:38,958 INFO L442 AbstractCegarLoop]: Interpolant automaton has 31 states [2019-12-07 12:30:38,958 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-12-07 12:30:38,958 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2019-12-07 12:30:38,959 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=1318, Unknown=0, NotChecked=0, Total=1406 [2019-12-07 12:30:38,959 INFO L87 Difference]: Start difference. First operand 47 states and 48 transitions. Second operand 31 states. [2019-12-07 12:30:42,629 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 12:30:42,630 INFO L93 Difference]: Finished difference Result 79 states and 80 transitions. [2019-12-07 12:30:42,631 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2019-12-07 12:30:42,631 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 46 [2019-12-07 12:30:42,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 12:30:42,632 INFO L225 Difference]: With dead ends: 79 [2019-12-07 12:30:42,632 INFO L226 Difference]: Without dead ends: 50 [2019-12-07 12:30:42,635 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 111 SyntacticMatches, 8 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 383 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=254, Invalid=3168, Unknown=0, NotChecked=0, Total=3422 [2019-12-07 12:30:42,636 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2019-12-07 12:30:42,640 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 49. [2019-12-07 12:30:42,640 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2019-12-07 12:30:42,641 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 50 transitions. [2019-12-07 12:30:42,642 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 50 transitions. Word has length 46 [2019-12-07 12:30:42,642 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 12:30:42,642 INFO L462 AbstractCegarLoop]: Abstraction has 49 states and 50 transitions. [2019-12-07 12:30:42,642 INFO L463 AbstractCegarLoop]: Interpolant automaton has 31 states. [2019-12-07 12:30:42,642 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 50 transitions. [2019-12-07 12:30:42,643 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2019-12-07 12:30:42,643 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 12:30:42,643 INFO L410 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1] [2019-12-07 12:30:42,844 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 12:30:42,844 INFO L410 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2019-12-07 12:30:42,844 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 12:30:42,844 INFO L82 PathProgramCache]: Analyzing trace with hash -1691190831, now seen corresponding path program 13 times [2019-12-07 12:30:42,844 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-12-07 12:30:42,844 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1366129387] [2019-12-07 12:30:42,844 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 12:30:42,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 12:30:43,072 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 25 proven. 129 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 12:30:43,072 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1366129387] [2019-12-07 12:30:43,073 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [696685767] [2019-12-07 12:30:43,073 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_8aabcfa5-fb25-40a6-9510-9d72b4068ea0/bin/utaipan/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 12:30:43,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 12:30:43,114 INFO L264 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 50 conjunts are in the unsatisfiable core [2019-12-07 12:30:43,115 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 12:30:43,232 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 36 proven. 118 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 12:30:43,232 INFO L329 TraceCheckSpWp]: Computing backward predicates... [2019-12-07 12:30:43,529 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 36 proven. 118 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 12:30:43,530 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1064549954] [2019-12-07 12:30:43,530 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2019-12-07 12:30:43,530 INFO L166 IcfgInterpreter]: Building call graph [2019-12-07 12:30:43,531 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-12-07 12:30:43,531 INFO L176 IcfgInterpreter]: Starting interpretation [2019-12-07 12:30:43,531 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-12-07 12:30:43,720 INFO L180 IcfgInterpreter]: Interpretation finished [2019-12-07 12:30:44,433 WARN L192 SmtUtils]: Spent 275.00 ms on a formula simplification. DAG size of input: 87 DAG size of output: 72 [2019-12-07 12:30:45,196 WARN L192 SmtUtils]: Spent 575.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 81 [2019-12-07 12:30:45,607 WARN L192 SmtUtils]: Spent 301.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 77 [2019-12-07 12:30:45,727 INFO L343 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-12-07 12:30:45,727 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-12-07 12:30:45,727 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 34 [2019-12-07 12:30:45,728 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1931708995] [2019-12-07 12:30:45,728 INFO L442 AbstractCegarLoop]: Interpolant automaton has 36 states [2019-12-07 12:30:45,728 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-12-07 12:30:45,728 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2019-12-07 12:30:45,729 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=1708, Unknown=0, NotChecked=0, Total=1892 [2019-12-07 12:30:45,729 INFO L87 Difference]: Start difference. First operand 49 states and 50 transitions. Second operand 36 states. [2019-12-07 12:30:46,432 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 12:30:46,432 INFO L93 Difference]: Finished difference Result 54 states and 55 transitions. [2019-12-07 12:30:46,432 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-12-07 12:30:46,432 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 48 [2019-12-07 12:30:46,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 12:30:46,433 INFO L225 Difference]: With dead ends: 54 [2019-12-07 12:30:46,433 INFO L226 Difference]: Without dead ends: 54 [2019-12-07 12:30:46,434 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 109 SyntacticMatches, 8 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 802 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=618, Invalid=3164, Unknown=0, NotChecked=0, Total=3782 [2019-12-07 12:30:46,434 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2019-12-07 12:30:46,435 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2019-12-07 12:30:46,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2019-12-07 12:30:46,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 54 transitions. [2019-12-07 12:30:46,435 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 54 transitions. Word has length 48 [2019-12-07 12:30:46,436 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 12:30:46,436 INFO L462 AbstractCegarLoop]: Abstraction has 53 states and 54 transitions. [2019-12-07 12:30:46,436 INFO L463 AbstractCegarLoop]: Interpolant automaton has 36 states. [2019-12-07 12:30:46,436 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 54 transitions. [2019-12-07 12:30:46,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2019-12-07 12:30:46,436 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 12:30:46,436 INFO L410 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 7, 7, 1, 1, 1, 1] [2019-12-07 12:30:46,637 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 12:30:46,637 INFO L410 AbstractCegarLoop]: === Iteration 23 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2019-12-07 12:30:46,637 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 12:30:46,638 INFO L82 PathProgramCache]: Analyzing trace with hash 1750989296, now seen corresponding path program 14 times [2019-12-07 12:30:46,638 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-12-07 12:30:46,638 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [764262262] [2019-12-07 12:30:46,639 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 12:30:46,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 12:30:46,901 INFO L134 CoverageAnalysis]: Checked inductivity of 185 backedges. 24 proven. 161 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 12:30:46,901 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [764262262] [2019-12-07 12:30:46,901 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1045257949] [2019-12-07 12:30:46,901 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_8aabcfa5-fb25-40a6-9510-9d72b4068ea0/bin/utaipan/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 12:30:49,123 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2019-12-07 12:30:49,123 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-12-07 12:30:49,128 INFO L264 TraceCheckSpWp]: Trace formula consists of 251 conjuncts, 66 conjunts are in the unsatisfiable core [2019-12-07 12:30:49,129 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 12:30:49,336 INFO L134 CoverageAnalysis]: Checked inductivity of 185 backedges. 24 proven. 161 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 12:30:49,337 INFO L329 TraceCheckSpWp]: Computing backward predicates... [2019-12-07 12:30:49,538 INFO L134 CoverageAnalysis]: Checked inductivity of 185 backedges. 24 proven. 161 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 12:30:49,538 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [627616034] [2019-12-07 12:30:49,538 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2019-12-07 12:30:49,538 INFO L166 IcfgInterpreter]: Building call graph [2019-12-07 12:30:49,539 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-12-07 12:30:49,539 INFO L176 IcfgInterpreter]: Starting interpretation [2019-12-07 12:30:49,539 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-12-07 12:30:49,734 INFO L180 IcfgInterpreter]: Interpretation finished [2019-12-07 12:30:50,183 WARN L192 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 35 DAG size of output: 29 [2019-12-07 12:30:50,999 WARN L192 SmtUtils]: Spent 533.00 ms on a formula simplification. DAG size of input: 87 DAG size of output: 72 [2019-12-07 12:30:51,656 WARN L192 SmtUtils]: Spent 367.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 81 [2019-12-07 12:30:52,816 WARN L192 SmtUtils]: Spent 945.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 77 [2019-12-07 12:30:53,154 INFO L343 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-12-07 12:30:53,154 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-12-07 12:30:53,154 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20, 20] total 33 [2019-12-07 12:30:53,154 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [557641025] [2019-12-07 12:30:53,155 INFO L442 AbstractCegarLoop]: Interpolant automaton has 34 states [2019-12-07 12:30:53,155 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-12-07 12:30:53,155 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2019-12-07 12:30:53,155 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=1617, Unknown=0, NotChecked=0, Total=1722 [2019-12-07 12:30:53,155 INFO L87 Difference]: Start difference. First operand 53 states and 54 transitions. Second operand 34 states. [2019-12-07 12:30:55,866 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 12:30:55,866 INFO L93 Difference]: Finished difference Result 89 states and 90 transitions. [2019-12-07 12:30:55,866 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2019-12-07 12:30:55,866 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 52 [2019-12-07 12:30:55,866 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 12:30:55,866 INFO L225 Difference]: With dead ends: 89 [2019-12-07 12:30:55,867 INFO L226 Difference]: Without dead ends: 56 [2019-12-07 12:30:55,868 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 199 GetRequests, 126 SyntacticMatches, 9 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 547 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=292, Invalid=3998, Unknown=0, NotChecked=0, Total=4290 [2019-12-07 12:30:55,868 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2019-12-07 12:30:55,869 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2019-12-07 12:30:55,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2019-12-07 12:30:55,870 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 56 transitions. [2019-12-07 12:30:55,870 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 56 transitions. Word has length 52 [2019-12-07 12:30:55,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 12:30:55,870 INFO L462 AbstractCegarLoop]: Abstraction has 55 states and 56 transitions. [2019-12-07 12:30:55,870 INFO L463 AbstractCegarLoop]: Interpolant automaton has 34 states. [2019-12-07 12:30:55,870 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 56 transitions. [2019-12-07 12:30:55,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2019-12-07 12:30:55,871 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 12:30:55,871 INFO L410 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 1, 1, 1, 1] [2019-12-07 12:30:56,072 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 12:30:56,072 INFO L410 AbstractCegarLoop]: === Iteration 24 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2019-12-07 12:30:56,073 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 12:30:56,073 INFO L82 PathProgramCache]: Analyzing trace with hash -463666596, now seen corresponding path program 15 times [2019-12-07 12:30:56,073 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-12-07 12:30:56,073 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [376138575] [2019-12-07 12:30:56,074 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 12:30:56,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 12:30:56,314 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 36 proven. 164 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 12:30:56,314 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [376138575] [2019-12-07 12:30:56,314 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1142230664] [2019-12-07 12:30:56,314 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_8aabcfa5-fb25-40a6-9510-9d72b4068ea0/bin/utaipan/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 12:30:56,379 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-12-07 12:30:56,379 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-12-07 12:30:56,381 INFO L264 TraceCheckSpWp]: Trace formula consists of 261 conjuncts, 57 conjunts are in the unsatisfiable core [2019-12-07 12:30:56,382 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 12:30:56,855 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 49 proven. 151 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 12:30:56,855 INFO L329 TraceCheckSpWp]: Computing backward predicates... [2019-12-07 12:30:57,781 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 64 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 12:30:57,781 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2042757376] [2019-12-07 12:30:57,782 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2019-12-07 12:30:57,782 INFO L166 IcfgInterpreter]: Building call graph [2019-12-07 12:30:57,782 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-12-07 12:30:57,782 INFO L176 IcfgInterpreter]: Starting interpretation [2019-12-07 12:30:57,782 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-12-07 12:30:57,863 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 12:30:57,867 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 12:30:58,002 INFO L180 IcfgInterpreter]: Interpretation finished [2019-12-07 12:30:58,600 WARN L192 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 35 DAG size of output: 29 [2019-12-07 12:30:59,517 WARN L192 SmtUtils]: Spent 617.00 ms on a formula simplification. DAG size of input: 87 DAG size of output: 72 [2019-12-07 12:31:00,388 WARN L192 SmtUtils]: Spent 586.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 81 [2019-12-07 12:31:01,095 WARN L192 SmtUtils]: Spent 519.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 77 [2019-12-07 12:31:01,247 INFO L343 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-12-07 12:31:01,247 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-12-07 12:31:01,247 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 57 [2019-12-07 12:31:01,247 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1126041200] [2019-12-07 12:31:01,247 INFO L442 AbstractCegarLoop]: Interpolant automaton has 59 states [2019-12-07 12:31:01,248 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-12-07 12:31:01,248 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2019-12-07 12:31:01,249 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=472, Invalid=3950, Unknown=0, NotChecked=0, Total=4422 [2019-12-07 12:31:01,249 INFO L87 Difference]: Start difference. First operand 55 states and 56 transitions. Second operand 59 states. [2019-12-07 12:31:01,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 12:31:01,868 INFO L93 Difference]: Finished difference Result 60 states and 61 transitions. [2019-12-07 12:31:01,868 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2019-12-07 12:31:01,868 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 54 [2019-12-07 12:31:01,868 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 12:31:01,869 INFO L225 Difference]: With dead ends: 60 [2019-12-07 12:31:01,869 INFO L226 Difference]: Without dead ends: 60 [2019-12-07 12:31:01,870 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 191 GetRequests, 114 SyntacticMatches, 0 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1673 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=911, Invalid=5251, Unknown=0, NotChecked=0, Total=6162 [2019-12-07 12:31:01,870 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2019-12-07 12:31:01,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2019-12-07 12:31:01,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2019-12-07 12:31:01,872 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 60 transitions. [2019-12-07 12:31:01,872 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 60 transitions. Word has length 54 [2019-12-07 12:31:01,872 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 12:31:01,872 INFO L462 AbstractCegarLoop]: Abstraction has 59 states and 60 transitions. [2019-12-07 12:31:01,872 INFO L463 AbstractCegarLoop]: Interpolant automaton has 59 states. [2019-12-07 12:31:01,872 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 60 transitions. [2019-12-07 12:31:01,873 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2019-12-07 12:31:01,873 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 12:31:01,873 INFO L410 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 8, 8, 1, 1, 1, 1] [2019-12-07 12:31:02,073 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 12:31:02,074 INFO L410 AbstractCegarLoop]: === Iteration 25 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2019-12-07 12:31:02,074 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 12:31:02,074 INFO L82 PathProgramCache]: Analyzing trace with hash -1867823877, now seen corresponding path program 16 times [2019-12-07 12:31:02,075 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-12-07 12:31:02,075 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [661386522] [2019-12-07 12:31:02,075 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 12:31:02,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 12:31:02,372 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 27 proven. 208 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 12:31:02,372 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [661386522] [2019-12-07 12:31:02,372 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1435901248] [2019-12-07 12:31:02,372 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_8aabcfa5-fb25-40a6-9510-9d72b4068ea0/bin/utaipan/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 12:31:02,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 12:31:02,419 INFO L264 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 70 conjunts are in the unsatisfiable core [2019-12-07 12:31:02,420 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 12:31:02,665 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 27 proven. 208 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 12:31:02,665 INFO L329 TraceCheckSpWp]: Computing backward predicates... [2019-12-07 12:31:02,929 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 27 proven. 208 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 12:31:02,929 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [415265802] [2019-12-07 12:31:02,930 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2019-12-07 12:31:02,930 INFO L166 IcfgInterpreter]: Building call graph [2019-12-07 12:31:02,930 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-12-07 12:31:02,930 INFO L176 IcfgInterpreter]: Starting interpretation [2019-12-07 12:31:02,930 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-12-07 12:31:03,075 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 12:31:03,098 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 12:31:03,211 INFO L180 IcfgInterpreter]: Interpretation finished [2019-12-07 12:31:03,646 WARN L192 SmtUtils]: Spent 192.00 ms on a formula simplification. DAG size of input: 82 DAG size of output: 66 [2019-12-07 12:31:04,665 WARN L192 SmtUtils]: Spent 751.00 ms on a formula simplification. DAG size of input: 84 DAG size of output: 68 [2019-12-07 12:31:05,041 WARN L192 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 46 [2019-12-07 12:31:05,598 WARN L192 SmtUtils]: Spent 331.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 55 [2019-12-07 12:31:05,907 INFO L343 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-12-07 12:31:05,907 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-12-07 12:31:05,907 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22, 22] total 36 [2019-12-07 12:31:05,907 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [787073561] [2019-12-07 12:31:05,908 INFO L442 AbstractCegarLoop]: Interpolant automaton has 37 states [2019-12-07 12:31:05,908 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-12-07 12:31:05,908 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2019-12-07 12:31:05,908 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=1792, Unknown=0, NotChecked=0, Total=1892 [2019-12-07 12:31:05,908 INFO L87 Difference]: Start difference. First operand 59 states and 60 transitions. Second operand 37 states. [2019-12-07 12:31:08,657 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 12:31:08,657 INFO L93 Difference]: Finished difference Result 99 states and 100 transitions. [2019-12-07 12:31:08,658 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2019-12-07 12:31:08,658 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 58 [2019-12-07 12:31:08,658 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 12:31:08,658 INFO L225 Difference]: With dead ends: 99 [2019-12-07 12:31:08,658 INFO L226 Difference]: Without dead ends: 62 [2019-12-07 12:31:08,659 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 222 GetRequests, 143 SyntacticMatches, 10 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 554 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=308, Invalid=4662, Unknown=0, NotChecked=0, Total=4970 [2019-12-07 12:31:08,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2019-12-07 12:31:08,659 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2019-12-07 12:31:08,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2019-12-07 12:31:08,660 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 62 transitions. [2019-12-07 12:31:08,660 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 62 transitions. Word has length 58 [2019-12-07 12:31:08,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 12:31:08,660 INFO L462 AbstractCegarLoop]: Abstraction has 61 states and 62 transitions. [2019-12-07 12:31:08,660 INFO L463 AbstractCegarLoop]: Interpolant automaton has 37 states. [2019-12-07 12:31:08,660 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 62 transitions. [2019-12-07 12:31:08,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2019-12-07 12:31:08,661 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 12:31:08,661 INFO L410 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 1, 1, 1, 1] [2019-12-07 12:31:08,861 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 12:31:08,862 INFO L410 AbstractCegarLoop]: === Iteration 26 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2019-12-07 12:31:08,862 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 12:31:08,862 INFO L82 PathProgramCache]: Analyzing trace with hash 1415924839, now seen corresponding path program 17 times [2019-12-07 12:31:08,863 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-12-07 12:31:08,863 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1283715355] [2019-12-07 12:31:08,863 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 12:31:08,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 12:31:09,148 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 49 proven. 203 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 12:31:09,148 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1283715355] [2019-12-07 12:31:09,149 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1946560988] [2019-12-07 12:31:09,149 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_8aabcfa5-fb25-40a6-9510-9d72b4068ea0/bin/utaipan/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 12:31:09,254 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2019-12-07 12:31:09,254 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-12-07 12:31:09,255 INFO L264 TraceCheckSpWp]: Trace formula consists of 287 conjuncts, 42 conjunts are in the unsatisfiable core [2019-12-07 12:31:09,257 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 12:31:09,429 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 35 refuted. 0 times theorem prover too weak. 217 trivial. 0 not checked. [2019-12-07 12:31:09,429 INFO L329 TraceCheckSpWp]: Computing backward predicates... [2019-12-07 12:31:09,621 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 59 refuted. 0 times theorem prover too weak. 193 trivial. 0 not checked. [2019-12-07 12:31:09,621 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [583780744] [2019-12-07 12:31:09,621 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2019-12-07 12:31:09,621 INFO L166 IcfgInterpreter]: Building call graph [2019-12-07 12:31:09,622 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-12-07 12:31:09,622 INFO L176 IcfgInterpreter]: Starting interpretation [2019-12-07 12:31:09,622 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-12-07 12:31:09,809 INFO L180 IcfgInterpreter]: Interpretation finished [2019-12-07 12:31:09,990 WARN L192 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 50 [2019-12-07 12:31:10,174 WARN L192 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 28 [2019-12-07 12:31:11,447 WARN L192 SmtUtils]: Spent 916.00 ms on a formula simplification. DAG size of input: 87 DAG size of output: 72 [2019-12-07 12:31:12,391 WARN L192 SmtUtils]: Spent 689.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 81 [2019-12-07 12:31:12,884 WARN L192 SmtUtils]: Spent 345.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 77 [2019-12-07 12:31:13,316 WARN L192 SmtUtils]: Spent 314.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 46 [2019-12-07 12:31:13,322 INFO L343 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-12-07 12:31:13,322 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-12-07 12:31:13,322 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 4, 5] total 30 [2019-12-07 12:31:13,323 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [108331732] [2019-12-07 12:31:13,324 INFO L442 AbstractCegarLoop]: Interpolant automaton has 32 states [2019-12-07 12:31:13,324 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-12-07 12:31:13,324 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2019-12-07 12:31:13,325 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=1385, Unknown=0, NotChecked=0, Total=1560 [2019-12-07 12:31:13,326 INFO L87 Difference]: Start difference. First operand 61 states and 62 transitions. Second operand 32 states. [2019-12-07 12:31:14,114 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 12:31:14,114 INFO L93 Difference]: Finished difference Result 61 states and 62 transitions. [2019-12-07 12:31:14,114 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2019-12-07 12:31:14,114 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 60 [2019-12-07 12:31:14,114 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 12:31:14,114 INFO L225 Difference]: With dead ends: 61 [2019-12-07 12:31:14,114 INFO L226 Difference]: Without dead ends: 0 [2019-12-07 12:31:14,115 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 220 GetRequests, 161 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 575 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=666, Invalid=2994, Unknown=0, NotChecked=0, Total=3660 [2019-12-07 12:31:14,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2019-12-07 12:31:14,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2019-12-07 12:31:14,115 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2019-12-07 12:31:14,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2019-12-07 12:31:14,115 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 60 [2019-12-07 12:31:14,115 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 12:31:14,115 INFO L462 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2019-12-07 12:31:14,115 INFO L463 AbstractCegarLoop]: Interpolant automaton has 32 states. [2019-12-07 12:31:14,116 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2019-12-07 12:31:14,116 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2019-12-07 12:31:14,316 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 12:31:14,326 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 07.12 12:31:14 BoogieIcfgContainer [2019-12-07 12:31:14,327 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2019-12-07 12:31:14,328 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2019-12-07 12:31:14,328 INFO L271 PluginConnector]: Initializing Witness Printer... [2019-12-07 12:31:14,328 INFO L275 PluginConnector]: Witness Printer initialized [2019-12-07 12:31:14,329 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.12 12:29:55" (3/4) ... [2019-12-07 12:31:14,336 INFO L137 WitnessPrinter]: Generating witness for correct program [2019-12-07 12:31:14,356 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 14 nodes and edges [2019-12-07 12:31:14,357 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 7 nodes and edges [2019-12-07 12:31:14,357 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 2 nodes and edges [2019-12-07 12:31:14,391 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_8aabcfa5-fb25-40a6-9510-9d72b4068ea0/bin/utaipan/witness.graphml [2019-12-07 12:31:14,391 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2019-12-07 12:31:14,392 INFO L168 Benchmark]: Toolchain (without parser) took 79286.46 ms. Allocated memory was 1.0 GB in the beginning and 1.3 GB in the end (delta: 270.5 MB). Free memory was 934.0 MB in the beginning and 892.9 MB in the end (delta: 41.1 MB). Peak memory consumption was 311.7 MB. Max. memory is 11.5 GB. [2019-12-07 12:31:14,392 INFO L168 Benchmark]: CDTParser took 0.17 ms. Allocated memory is still 1.0 GB. Free memory is still 955.5 MB. There was no memory consumed. Max. memory is 11.5 GB. [2019-12-07 12:31:14,392 INFO L168 Benchmark]: CACSL2BoogieTranslator took 295.32 ms. Allocated memory was 1.0 GB in the beginning and 1.1 GB in the end (delta: 97.0 MB). Free memory was 934.0 MB in the beginning and 1.1 GB in the end (delta: -145.6 MB). Peak memory consumption was 18.1 MB. Max. memory is 11.5 GB. [2019-12-07 12:31:14,393 INFO L168 Benchmark]: Boogie Procedure Inliner took 29.90 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 12:31:14,393 INFO L168 Benchmark]: Boogie Preprocessor took 18.02 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 12:31:14,393 INFO L168 Benchmark]: RCFGBuilder took 279.37 ms. Allocated memory is still 1.1 GB. Free memory was 1.1 GB in the beginning and 1.0 GB in the end (delta: 27.2 MB). Peak memory consumption was 27.2 MB. Max. memory is 11.5 GB. [2019-12-07 12:31:14,393 INFO L168 Benchmark]: TraceAbstraction took 78596.38 ms. Allocated memory was 1.1 GB in the beginning and 1.3 GB in the end (delta: 173.5 MB). Free memory was 1.0 GB in the beginning and 905.4 MB in the end (delta: 136.2 MB). Peak memory consumption was 309.8 MB. Max. memory is 11.5 GB. [2019-12-07 12:31:14,393 INFO L168 Benchmark]: Witness Printer took 63.52 ms. Allocated memory is still 1.3 GB. Free memory was 905.4 MB in the beginning and 892.9 MB in the end (delta: 12.5 MB). Peak memory consumption was 12.5 MB. Max. memory is 11.5 GB. [2019-12-07 12:31:14,394 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 955.5 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 295.32 ms. Allocated memory was 1.0 GB in the beginning and 1.1 GB in the end (delta: 97.0 MB). Free memory was 934.0 MB in the beginning and 1.1 GB in the end (delta: -145.6 MB). Peak memory consumption was 18.1 MB. Max. memory is 11.5 GB. * Boogie Procedure Inliner took 29.90 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. * Boogie Preprocessor took 18.02 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. * RCFGBuilder took 279.37 ms. Allocated memory is still 1.1 GB. Free memory was 1.1 GB in the beginning and 1.0 GB in the end (delta: 27.2 MB). Peak memory consumption was 27.2 MB. Max. memory is 11.5 GB. * TraceAbstraction took 78596.38 ms. Allocated memory was 1.1 GB in the beginning and 1.3 GB in the end (delta: 173.5 MB). Free memory was 1.0 GB in the beginning and 905.4 MB in the end (delta: 136.2 MB). Peak memory consumption was 309.8 MB. Max. memory is 11.5 GB. * Witness Printer took 63.52 ms. Allocated memory is still 1.3 GB. Free memory was 905.4 MB in the beginning and 892.9 MB in the end (delta: 12.5 MB). Peak memory consumption was 12.5 MB. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 534]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 534]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 521]: all allocated memory was freed For all program executions holds that all allocated memory was freed at this location - PositiveResult [Line: 517]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 517]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 537]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 537]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - AllSpecificationsHoldResult: All specifications hold 7 specifications checked. All of them hold - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 18 locations, 7 error locations. Result: SAFE, OverallTime: 78.5s, OverallIterations: 26, TraceHistogramMax: 10, AutomataDifference: 17.0s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, HoareTripleCheckerStatistics: 320 SDtfs, 3477 SDslu, 2898 SDs, 0 SdLazy, 6873 SolverSat, 1057 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 5.4s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 2341 GetRequests, 1386 SyntacticMatches, 63 SemanticMatches, 892 ConstructedPredicates, 0 IntricatePredicates, 5 DeprecatedPredicates, 9632 ImplicationChecksByTransitivity, 58.6s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=61occurred in iteration=25, 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, 26 MinimizatonAttempts, 59 StatesRemovedByMinimization, 21 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 3.1s SatisfiabilityAnalysisTime, 9.7s InterpolantComputationTime, 1298 NumberOfCodeBlocks, 1298 NumberOfCodeBlocksAsserted, 82 NumberOfCheckSat, 1861 ConstructedInterpolants, 112 QuantifiedInterpolants, 777553 SizeOfPredicates, 230 NumberOfNonLiveVariables, 3177 ConjunctsInSsa, 747 ConjunctsInUnsatCore, 62 InterpolantComputations, 8 PerfectInterpolantSequences, 1276/5157 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 correct! Received shutdown request...