./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 7b2dab56 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_30a406d9-f441-4710-a5e5-186db8501b7e/bin/utaipan/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_30a406d9-f441-4710-a5e5-186db8501b7e/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_30a406d9-f441-4710-a5e5-186db8501b7e/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_30a406d9-f441-4710-a5e5-186db8501b7e/bin/utaipan/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/openbsd_cstrnlen-alloca-1.i -s /tmp/vcloud-vcloud-master/worker/run_dir_30a406d9-f441-4710-a5e5-186db8501b7e/bin/utaipan/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_30a406d9-f441-4710-a5e5-186db8501b7e/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 0.2.0-7b2dab5 [2020-12-09 07:12:21,999 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-09 07:12:22,001 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-09 07:12:22,025 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-12-09 07:12:22,025 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-12-09 07:12:22,026 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-12-09 07:12:22,028 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-12-09 07:12:22,030 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-12-09 07:12:22,031 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-12-09 07:12:22,032 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-12-09 07:12:22,033 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-12-09 07:12:22,034 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-12-09 07:12:22,035 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-12-09 07:12:22,036 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-12-09 07:12:22,037 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-12-09 07:12:22,038 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-12-09 07:12:22,038 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-12-09 07:12:22,039 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-12-09 07:12:22,041 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-12-09 07:12:22,043 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-12-09 07:12:22,044 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-12-09 07:12:22,046 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-12-09 07:12:22,051 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-12-09 07:12:22,052 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-12-09 07:12:22,054 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-12-09 07:12:22,054 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-12-09 07:12:22,054 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-12-09 07:12:22,055 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-12-09 07:12:22,056 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-12-09 07:12:22,056 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-12-09 07:12:22,057 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-12-09 07:12:22,057 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-12-09 07:12:22,058 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-12-09 07:12:22,058 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-12-09 07:12:22,059 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-12-09 07:12:22,059 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-12-09 07:12:22,060 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-12-09 07:12:22,060 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-12-09 07:12:22,060 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-09 07:12:22,061 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-09 07:12:22,061 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-09 07:12:22,062 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_30a406d9-f441-4710-a5e5-186db8501b7e/bin/utaipan/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2020-12-09 07:12:22,084 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-09 07:12:22,084 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-09 07:12:22,084 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2020-12-09 07:12:22,084 INFO L138 SettingsManager]: * User list type=DISABLED [2020-12-09 07:12:22,085 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2020-12-09 07:12:22,085 INFO L138 SettingsManager]: * Explicit value domain=true [2020-12-09 07:12:22,085 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2020-12-09 07:12:22,085 INFO L138 SettingsManager]: * Octagon Domain=false [2020-12-09 07:12:22,085 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2020-12-09 07:12:22,085 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2020-12-09 07:12:22,085 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2020-12-09 07:12:22,085 INFO L138 SettingsManager]: * Interval Domain=false [2020-12-09 07:12:22,086 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2020-12-09 07:12:22,086 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2020-12-09 07:12:22,086 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2020-12-09 07:12:22,086 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-12-09 07:12:22,086 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-12-09 07:12:22,087 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-09 07:12:22,087 INFO L138 SettingsManager]: * sizeof long=4 [2020-12-09 07:12:22,087 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2020-12-09 07:12:22,087 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-09 07:12:22,087 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-12-09 07:12:22,087 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-09 07:12:22,087 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2020-12-09 07:12:22,087 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2020-12-09 07:12:22,087 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2020-12-09 07:12:22,088 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-09 07:12:22,088 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2020-12-09 07:12:22,088 INFO L138 SettingsManager]: * sizeof long double=12 [2020-12-09 07:12:22,088 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-09 07:12:22,088 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-09 07:12:22,088 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-09 07:12:22,088 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-09 07:12:22,088 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-09 07:12:22,088 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-09 07:12:22,089 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2020-12-09 07:12:22,089 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-09 07:12:22,089 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-09 07:12:22,089 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-12-09 07:12:22,089 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud-vcloud-master/worker/run_dir_30a406d9-f441-4710-a5e5-186db8501b7e/bin/utaipan/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_30a406d9-f441-4710-a5e5-186db8501b7e/bin/utaipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 7ac509d7b3f1ef173e01ced3ce9249a58ee1c04d [2020-12-09 07:12:22,280 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-09 07:12:22,301 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-09 07:12:22,303 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-09 07:12:22,304 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-09 07:12:22,304 INFO L275 PluginConnector]: CDTParser initialized [2020-12-09 07:12:22,305 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_30a406d9-f441-4710-a5e5-186db8501b7e/bin/utaipan/../../sv-benchmarks/c/array-memsafety/openbsd_cstrnlen-alloca-1.i [2020-12-09 07:12:22,346 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_30a406d9-f441-4710-a5e5-186db8501b7e/bin/utaipan/data/15cd8729c/82a01d96ccef44ea9cd6f5d92bd172e0/FLAGedf8a731a [2020-12-09 07:12:22,744 INFO L306 CDTParser]: Found 1 translation units. [2020-12-09 07:12:22,745 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_30a406d9-f441-4710-a5e5-186db8501b7e/sv-benchmarks/c/array-memsafety/openbsd_cstrnlen-alloca-1.i [2020-12-09 07:12:22,755 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_30a406d9-f441-4710-a5e5-186db8501b7e/bin/utaipan/data/15cd8729c/82a01d96ccef44ea9cd6f5d92bd172e0/FLAGedf8a731a [2020-12-09 07:12:22,764 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_30a406d9-f441-4710-a5e5-186db8501b7e/bin/utaipan/data/15cd8729c/82a01d96ccef44ea9cd6f5d92bd172e0 [2020-12-09 07:12:22,766 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-09 07:12:22,767 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-09 07:12:22,768 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-09 07:12:22,768 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-09 07:12:22,770 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-09 07:12:22,771 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.12 07:12:22" (1/1) ... [2020-12-09 07:12:22,772 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3fe1b45d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 07:12:22, skipping insertion in model container [2020-12-09 07:12:22,773 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.12 07:12:22" (1/1) ... [2020-12-09 07:12:22,778 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-09 07:12:22,803 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-09 07:12:22,968 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-09 07:12:22,974 INFO L203 MainTranslator]: Completed pre-run [2020-12-09 07:12:22,999 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-09 07:12:23,035 INFO L208 MainTranslator]: Completed translation [2020-12-09 07:12:23,035 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 07:12:23 WrapperNode [2020-12-09 07:12:23,035 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-09 07:12:23,036 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-09 07:12:23,036 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-09 07:12:23,036 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-09 07:12:23,042 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 07:12:23" (1/1) ... [2020-12-09 07:12:23,051 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 07:12:23" (1/1) ... [2020-12-09 07:12:23,066 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-09 07:12:23,066 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-09 07:12:23,067 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-09 07:12:23,067 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-09 07:12:23,072 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 07:12:23" (1/1) ... [2020-12-09 07:12:23,073 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 07:12:23" (1/1) ... [2020-12-09 07:12:23,075 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 07:12:23" (1/1) ... [2020-12-09 07:12:23,075 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 07:12:23" (1/1) ... [2020-12-09 07:12:23,079 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 07:12:23" (1/1) ... [2020-12-09 07:12:23,082 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 07:12:23" (1/1) ... [2020-12-09 07:12:23,083 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 07:12:23" (1/1) ... [2020-12-09 07:12:23,085 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-09 07:12:23,086 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-09 07:12:23,086 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-09 07:12:23,086 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-09 07:12:23,087 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 07:12:23" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_30a406d9-f441-4710-a5e5-186db8501b7e/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 [2020-12-09 07:12:23,147 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-12-09 07:12:23,147 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-12-09 07:12:23,147 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-09 07:12:23,147 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-12-09 07:12:23,147 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-09 07:12:23,147 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-09 07:12:23,438 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-09 07:12:23,438 INFO L299 CfgBuilder]: Removed 8 assume(true) statements. [2020-12-09 07:12:23,440 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 07:12:23 BoogieIcfgContainer [2020-12-09 07:12:23,440 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-09 07:12:23,441 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-09 07:12:23,441 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-09 07:12:23,444 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-09 07:12:23,444 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 09.12 07:12:22" (1/3) ... [2020-12-09 07:12:23,444 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6854492c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.12 07:12:23, skipping insertion in model container [2020-12-09 07:12:23,444 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 07:12:23" (2/3) ... [2020-12-09 07:12:23,445 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6854492c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.12 07:12:23, skipping insertion in model container [2020-12-09 07:12:23,445 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 07:12:23" (3/3) ... [2020-12-09 07:12:23,446 INFO L111 eAbstractionObserver]: Analyzing ICFG openbsd_cstrnlen-alloca-1.i [2020-12-09 07:12:23,455 INFO L180 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-09 07:12:23,457 INFO L192 ceAbstractionStarter]: Appying trace abstraction to program that has 7 error locations. [2020-12-09 07:12:23,464 INFO L253 AbstractCegarLoop]: Starting to check reachability of 7 error locations. [2020-12-09 07:12:23,477 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-09 07:12:23,478 INFO L378 AbstractCegarLoop]: Hoare is false [2020-12-09 07:12:23,478 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-09 07:12:23,478 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-09 07:12:23,478 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-09 07:12:23,478 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-09 07:12:23,478 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-09 07:12:23,478 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-09 07:12:23,486 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states. [2020-12-09 07:12:23,490 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2020-12-09 07:12:23,490 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 07:12:23,491 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1] [2020-12-09 07:12:23,491 INFO L429 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]=== [2020-12-09 07:12:23,495 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 07:12:23,495 INFO L82 PathProgramCache]: Analyzing trace with hash 108370, now seen corresponding path program 1 times [2020-12-09 07:12:23,501 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 07:12:23,501 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [213522537] [2020-12-09 07:12:23,501 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 07:12:23,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 07:12:23,618 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:12:23,619 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [213522537] [2020-12-09 07:12:23,619 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-09 07:12:23,619 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2020-12-09 07:12:23,620 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1260354053] [2020-12-09 07:12:23,623 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-09 07:12:23,623 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 07:12:23,633 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-09 07:12:23,633 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-09 07:12:23,635 INFO L87 Difference]: Start difference. First operand 18 states. Second operand 3 states. [2020-12-09 07:12:23,661 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 07:12:23,661 INFO L93 Difference]: Finished difference Result 16 states and 18 transitions. [2020-12-09 07:12:23,661 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-09 07:12:23,662 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 3 [2020-12-09 07:12:23,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 07:12:23,668 INFO L225 Difference]: With dead ends: 16 [2020-12-09 07:12:23,668 INFO L226 Difference]: Without dead ends: 15 [2020-12-09 07:12:23,669 INFO L677 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 [2020-12-09 07:12:23,681 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-12-09 07:12:23,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-12-09 07:12:23,690 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-12-09 07:12:23,690 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-12-09 07:12:23,691 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 3 [2020-12-09 07:12:23,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 07:12:23,691 INFO L481 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-12-09 07:12:23,691 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-09 07:12:23,692 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-12-09 07:12:23,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2020-12-09 07:12:23,692 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 07:12:23,692 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1] [2020-12-09 07:12:23,692 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-09 07:12:23,692 INFO L429 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]=== [2020-12-09 07:12:23,693 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 07:12:23,693 INFO L82 PathProgramCache]: Analyzing trace with hash 108371, now seen corresponding path program 1 times [2020-12-09 07:12:23,693 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 07:12:23,693 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1004487275] [2020-12-09 07:12:23,693 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 07:12:23,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 07:12:23,745 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:12:23,746 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1004487275] [2020-12-09 07:12:23,746 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-09 07:12:23,746 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-12-09 07:12:23,746 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2090942721] [2020-12-09 07:12:23,747 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-12-09 07:12:23,748 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 07:12:23,748 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-12-09 07:12:23,749 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-12-09 07:12:23,749 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 4 states. [2020-12-09 07:12:23,792 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 07:12:23,792 INFO L93 Difference]: Finished difference Result 28 states and 32 transitions. [2020-12-09 07:12:23,793 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-12-09 07:12:23,793 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 3 [2020-12-09 07:12:23,793 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 07:12:23,794 INFO L225 Difference]: With dead ends: 28 [2020-12-09 07:12:23,794 INFO L226 Difference]: Without dead ends: 28 [2020-12-09 07:12:23,795 INFO L677 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 [2020-12-09 07:12:23,795 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-12-09 07:12:23,797 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 17. [2020-12-09 07:12:23,798 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-12-09 07:12:23,798 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 20 transitions. [2020-12-09 07:12:23,798 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 20 transitions. Word has length 3 [2020-12-09 07:12:23,798 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 07:12:23,798 INFO L481 AbstractCegarLoop]: Abstraction has 17 states and 20 transitions. [2020-12-09 07:12:23,799 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-12-09 07:12:23,799 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 20 transitions. [2020-12-09 07:12:23,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2020-12-09 07:12:23,799 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 07:12:23,799 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1] [2020-12-09 07:12:23,799 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-12-09 07:12:23,799 INFO L429 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]=== [2020-12-09 07:12:23,800 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 07:12:23,800 INFO L82 PathProgramCache]: Analyzing trace with hash 110085, now seen corresponding path program 1 times [2020-12-09 07:12:23,800 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 07:12:23,801 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1623188670] [2020-12-09 07:12:23,801 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 07:12:23,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 07:12:23,833 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:12:23,834 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1623188670] [2020-12-09 07:12:23,834 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-09 07:12:23,834 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2020-12-09 07:12:23,838 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1318215681] [2020-12-09 07:12:23,838 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-09 07:12:23,838 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 07:12:23,839 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-09 07:12:23,839 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-09 07:12:23,839 INFO L87 Difference]: Start difference. First operand 17 states and 20 transitions. Second operand 3 states. [2020-12-09 07:12:23,850 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 07:12:23,850 INFO L93 Difference]: Finished difference Result 16 states and 19 transitions. [2020-12-09 07:12:23,851 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-09 07:12:23,851 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 3 [2020-12-09 07:12:23,851 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 07:12:23,852 INFO L225 Difference]: With dead ends: 16 [2020-12-09 07:12:23,852 INFO L226 Difference]: Without dead ends: 16 [2020-12-09 07:12:23,852 INFO L677 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 [2020-12-09 07:12:23,852 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-12-09 07:12:23,854 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-12-09 07:12:23,854 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-12-09 07:12:23,854 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 19 transitions. [2020-12-09 07:12:23,855 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 19 transitions. Word has length 3 [2020-12-09 07:12:23,855 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 07:12:23,855 INFO L481 AbstractCegarLoop]: Abstraction has 16 states and 19 transitions. [2020-12-09 07:12:23,855 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-09 07:12:23,855 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 19 transitions. [2020-12-09 07:12:23,855 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2020-12-09 07:12:23,855 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 07:12:23,856 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1] [2020-12-09 07:12:23,856 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-12-09 07:12:23,856 INFO L429 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]=== [2020-12-09 07:12:23,856 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 07:12:23,856 INFO L82 PathProgramCache]: Analyzing trace with hash 104192359, now seen corresponding path program 1 times [2020-12-09 07:12:23,857 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 07:12:23,857 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [986322690] [2020-12-09 07:12:23,857 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 07:12:23,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 07:12:23,911 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:12:23,911 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [986322690] [2020-12-09 07:12:23,911 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [37760290] [2020-12-09 07:12:23,912 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_30a406d9-f441-4710-a5e5-186db8501b7e/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 [2020-12-09 07:12:23,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 07:12:23,945 INFO L263 TraceCheckSpWp]: Trace formula consists of 42 conjuncts, 11 conjunts are in the unsatisfiable core [2020-12-09 07:12:23,948 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 07:12:23,997 INFO L382 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 [2020-12-09 07:12:23,998 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-09 07:12:24,003 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-09 07:12:24,004 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2020-12-09 07:12:24,004 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:13, output treesize:12 [2020-12-09 07:12:24,037 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:12:24,037 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 07:12:24,075 INFO L639 QuantifierPusher]: Distributing 2 disjuncts over 3 conjuncts [2020-12-09 07:12:24,098 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:12:24,098 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1219968598] [2020-12-09 07:12:24,117 INFO L159 IcfgInterpreter]: Started Sifa with 4 locations of interest [2020-12-09 07:12:24,117 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 07:12:24,121 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 07:12:24,126 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 07:12:24,127 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 07:12:24,555 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 07:12:24,828 WARN L197 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 62 [2020-12-09 07:12:24,897 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 07:12:24,897 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 07:12:24,897 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 7 [2020-12-09 07:12:24,897 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1060551065] [2020-12-09 07:12:24,898 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-12-09 07:12:24,898 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 07:12:24,898 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-12-09 07:12:24,898 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2020-12-09 07:12:24,899 INFO L87 Difference]: Start difference. First operand 16 states and 19 transitions. Second operand 9 states. [2020-12-09 07:12:24,993 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 07:12:24,993 INFO L93 Difference]: Finished difference Result 36 states and 42 transitions. [2020-12-09 07:12:24,994 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-12-09 07:12:24,994 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 5 [2020-12-09 07:12:24,994 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 07:12:24,995 INFO L225 Difference]: With dead ends: 36 [2020-12-09 07:12:24,995 INFO L226 Difference]: Without dead ends: 36 [2020-12-09 07:12:24,996 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=56, Invalid=154, Unknown=0, NotChecked=0, Total=210 [2020-12-09 07:12:24,996 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-12-09 07:12:24,998 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 13. [2020-12-09 07:12:24,998 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-12-09 07:12:24,998 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 15 transitions. [2020-12-09 07:12:24,998 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 15 transitions. Word has length 5 [2020-12-09 07:12:24,999 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 07:12:24,999 INFO L481 AbstractCegarLoop]: Abstraction has 13 states and 15 transitions. [2020-12-09 07:12:24,999 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-12-09 07:12:24,999 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 15 transitions. [2020-12-09 07:12:24,999 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2020-12-09 07:12:24,999 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 07:12:24,999 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2020-12-09 07:12:25,200 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3 [2020-12-09 07:12:25,201 INFO L429 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]=== [2020-12-09 07:12:25,201 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 07:12:25,202 INFO L82 PathProgramCache]: Analyzing trace with hash -1014372349, now seen corresponding path program 1 times [2020-12-09 07:12:25,202 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 07:12:25,202 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1917986933] [2020-12-09 07:12:25,202 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 07:12:25,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 07:12:25,292 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:12:25,292 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1917986933] [2020-12-09 07:12:25,293 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-09 07:12:25,293 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-12-09 07:12:25,294 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1125111028] [2020-12-09 07:12:25,294 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-09 07:12:25,295 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 07:12:25,296 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-09 07:12:25,296 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-09 07:12:25,297 INFO L87 Difference]: Start difference. First operand 13 states and 15 transitions. Second operand 3 states. [2020-12-09 07:12:25,339 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 07:12:25,339 INFO L93 Difference]: Finished difference Result 12 states and 14 transitions. [2020-12-09 07:12:25,340 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-09 07:12:25,341 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 6 [2020-12-09 07:12:25,341 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 07:12:25,341 INFO L225 Difference]: With dead ends: 12 [2020-12-09 07:12:25,341 INFO L226 Difference]: Without dead ends: 12 [2020-12-09 07:12:25,342 INFO L677 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 [2020-12-09 07:12:25,342 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-12-09 07:12:25,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-12-09 07:12:25,345 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-12-09 07:12:25,345 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 14 transitions. [2020-12-09 07:12:25,346 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 14 transitions. Word has length 6 [2020-12-09 07:12:25,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 07:12:25,346 INFO L481 AbstractCegarLoop]: Abstraction has 12 states and 14 transitions. [2020-12-09 07:12:25,346 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-09 07:12:25,346 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 14 transitions. [2020-12-09 07:12:25,347 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2020-12-09 07:12:25,347 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 07:12:25,347 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2020-12-09 07:12:25,347 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-12-09 07:12:25,347 INFO L429 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]=== [2020-12-09 07:12:25,348 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 07:12:25,348 INFO L82 PathProgramCache]: Analyzing trace with hash -1014372348, now seen corresponding path program 1 times [2020-12-09 07:12:25,348 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 07:12:25,348 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2116501416] [2020-12-09 07:12:25,349 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 07:12:25,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 07:12:25,392 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:12:25,393 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2116501416] [2020-12-09 07:12:25,393 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-09 07:12:25,393 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-12-09 07:12:25,393 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1755982207] [2020-12-09 07:12:25,394 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-12-09 07:12:25,394 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 07:12:25,394 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-12-09 07:12:25,395 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-12-09 07:12:25,395 INFO L87 Difference]: Start difference. First operand 12 states and 14 transitions. Second operand 4 states. [2020-12-09 07:12:25,421 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 07:12:25,421 INFO L93 Difference]: Finished difference Result 19 states and 22 transitions. [2020-12-09 07:12:25,422 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-12-09 07:12:25,422 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 6 [2020-12-09 07:12:25,422 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 07:12:25,422 INFO L225 Difference]: With dead ends: 19 [2020-12-09 07:12:25,422 INFO L226 Difference]: Without dead ends: 19 [2020-12-09 07:12:25,423 INFO L677 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 [2020-12-09 07:12:25,423 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-12-09 07:12:25,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 15. [2020-12-09 07:12:25,424 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-12-09 07:12:25,424 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 18 transitions. [2020-12-09 07:12:25,424 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 18 transitions. Word has length 6 [2020-12-09 07:12:25,424 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 07:12:25,424 INFO L481 AbstractCegarLoop]: Abstraction has 15 states and 18 transitions. [2020-12-09 07:12:25,425 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-12-09 07:12:25,425 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 18 transitions. [2020-12-09 07:12:25,425 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2020-12-09 07:12:25,425 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 07:12:25,425 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 07:12:25,425 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-12-09 07:12:25,425 INFO L429 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]=== [2020-12-09 07:12:25,425 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 07:12:25,426 INFO L82 PathProgramCache]: Analyzing trace with hash 145937565, now seen corresponding path program 1 times [2020-12-09 07:12:25,426 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 07:12:25,426 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [854407664] [2020-12-09 07:12:25,426 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 07:12:25,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 07:12:25,484 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:12:25,484 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [854407664] [2020-12-09 07:12:25,484 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-09 07:12:25,485 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-12-09 07:12:25,485 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [172256361] [2020-12-09 07:12:25,485 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-12-09 07:12:25,485 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 07:12:25,485 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-12-09 07:12:25,485 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-12-09 07:12:25,485 INFO L87 Difference]: Start difference. First operand 15 states and 18 transitions. Second operand 5 states. [2020-12-09 07:12:25,528 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 07:12:25,529 INFO L93 Difference]: Finished difference Result 19 states and 21 transitions. [2020-12-09 07:12:25,529 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-12-09 07:12:25,529 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 8 [2020-12-09 07:12:25,529 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 07:12:25,529 INFO L225 Difference]: With dead ends: 19 [2020-12-09 07:12:25,529 INFO L226 Difference]: Without dead ends: 19 [2020-12-09 07:12:25,530 INFO L677 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 [2020-12-09 07:12:25,530 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-12-09 07:12:25,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 15. [2020-12-09 07:12:25,531 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-12-09 07:12:25,532 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-12-09 07:12:25,532 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 8 [2020-12-09 07:12:25,532 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 07:12:25,532 INFO L481 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-12-09 07:12:25,532 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-12-09 07:12:25,532 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-12-09 07:12:25,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-12-09 07:12:25,533 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 07:12:25,533 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 07:12:25,533 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-12-09 07:12:25,533 INFO L429 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]=== [2020-12-09 07:12:25,533 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 07:12:25,533 INFO L82 PathProgramCache]: Analyzing trace with hash 224103215, now seen corresponding path program 1 times [2020-12-09 07:12:25,534 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 07:12:25,534 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2048973330] [2020-12-09 07:12:25,534 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 07:12:25,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 07:12:25,587 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:12:25,587 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2048973330] [2020-12-09 07:12:25,587 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-09 07:12:25,587 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-12-09 07:12:25,587 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [835110713] [2020-12-09 07:12:25,588 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-12-09 07:12:25,588 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 07:12:25,588 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-12-09 07:12:25,588 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-12-09 07:12:25,589 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 4 states. [2020-12-09 07:12:25,599 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 07:12:25,599 INFO L93 Difference]: Finished difference Result 14 states and 16 transitions. [2020-12-09 07:12:25,599 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-12-09 07:12:25,600 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 9 [2020-12-09 07:12:25,600 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 07:12:25,600 INFO L225 Difference]: With dead ends: 14 [2020-12-09 07:12:25,600 INFO L226 Difference]: Without dead ends: 12 [2020-12-09 07:12:25,600 INFO L677 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 [2020-12-09 07:12:25,600 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-12-09 07:12:25,601 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-12-09 07:12:25,601 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-12-09 07:12:25,601 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 14 transitions. [2020-12-09 07:12:25,601 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 14 transitions. Word has length 9 [2020-12-09 07:12:25,602 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 07:12:25,602 INFO L481 AbstractCegarLoop]: Abstraction has 12 states and 14 transitions. [2020-12-09 07:12:25,602 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-12-09 07:12:25,602 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 14 transitions. [2020-12-09 07:12:25,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-12-09 07:12:25,602 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 07:12:25,602 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1] [2020-12-09 07:12:25,602 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-12-09 07:12:25,602 INFO L429 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]=== [2020-12-09 07:12:25,603 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 07:12:25,603 INFO L82 PathProgramCache]: Analyzing trace with hash -1642260829, now seen corresponding path program 1 times [2020-12-09 07:12:25,603 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 07:12:25,603 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [476811313] [2020-12-09 07:12:25,603 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 07:12:25,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 07:12:25,666 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:12:25,667 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [476811313] [2020-12-09 07:12:25,667 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-09 07:12:25,667 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-12-09 07:12:25,667 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1571828401] [2020-12-09 07:12:25,667 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-12-09 07:12:25,667 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 07:12:25,668 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-12-09 07:12:25,668 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-12-09 07:12:25,668 INFO L87 Difference]: Start difference. First operand 12 states and 14 transitions. Second operand 6 states. [2020-12-09 07:12:25,750 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 07:12:25,751 INFO L93 Difference]: Finished difference Result 20 states and 21 transitions. [2020-12-09 07:12:25,751 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-12-09 07:12:25,751 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 10 [2020-12-09 07:12:25,751 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 07:12:25,751 INFO L225 Difference]: With dead ends: 20 [2020-12-09 07:12:25,751 INFO L226 Difference]: Without dead ends: 14 [2020-12-09 07:12:25,752 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2020-12-09 07:12:25,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-12-09 07:12:25,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 13. [2020-12-09 07:12:25,753 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-12-09 07:12:25,753 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2020-12-09 07:12:25,753 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 10 [2020-12-09 07:12:25,753 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 07:12:25,753 INFO L481 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2020-12-09 07:12:25,753 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-12-09 07:12:25,753 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2020-12-09 07:12:25,753 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-12-09 07:12:25,753 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 07:12:25,753 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 07:12:25,753 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-12-09 07:12:25,754 INFO L429 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]=== [2020-12-09 07:12:25,754 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 07:12:25,754 INFO L82 PathProgramCache]: Analyzing trace with hash 230958607, now seen corresponding path program 1 times [2020-12-09 07:12:25,754 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 07:12:25,754 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [936246387] [2020-12-09 07:12:25,754 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 07:12:25,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 07:12:25,812 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:12:25,812 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [936246387] [2020-12-09 07:12:25,812 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [593061888] [2020-12-09 07:12:25,812 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_30a406d9-f441-4710-a5e5-186db8501b7e/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 [2020-12-09 07:12:25,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 07:12:25,850 INFO L263 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 20 conjunts are in the unsatisfiable core [2020-12-09 07:12:25,851 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 07:12:25,913 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:12:25,914 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 07:12:25,979 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:12:25,979 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [451084911] [2020-12-09 07:12:25,981 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2020-12-09 07:12:25,981 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 07:12:25,982 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 07:12:25,982 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 07:12:25,982 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 07:12:26,088 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 07:12:26,103 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 07:12:26,465 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 07:12:26,632 WARN L197 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 92 DAG size of output: 57 [2020-12-09 07:12:27,257 WARN L197 SmtUtils]: Spent 374.00 ms on a formula simplification. DAG size of input: 87 DAG size of output: 72 [2020-12-09 07:12:27,711 WARN L197 SmtUtils]: Spent 395.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 81 [2020-12-09 07:12:28,090 WARN L197 SmtUtils]: Spent 321.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 77 [2020-12-09 07:12:28,188 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 07:12:28,189 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 07:12:28,189 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 12 [2020-12-09 07:12:28,189 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [931281974] [2020-12-09 07:12:28,189 INFO L461 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-12-09 07:12:28,189 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 07:12:28,190 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-12-09 07:12:28,190 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=377, Unknown=0, NotChecked=0, Total=462 [2020-12-09 07:12:28,190 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 14 states. [2020-12-09 07:12:28,265 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 07:12:28,265 INFO L93 Difference]: Finished difference Result 19 states and 20 transitions. [2020-12-09 07:12:28,265 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-12-09 07:12:28,265 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 12 [2020-12-09 07:12:28,265 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 07:12:28,265 INFO L225 Difference]: With dead ends: 19 [2020-12-09 07:12:28,265 INFO L226 Difference]: Without dead ends: 19 [2020-12-09 07:12:28,266 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 17 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 180 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=120, Invalid=530, Unknown=0, NotChecked=0, Total=650 [2020-12-09 07:12:28,266 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-12-09 07:12:28,267 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 17. [2020-12-09 07:12:28,267 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-12-09 07:12:28,267 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2020-12-09 07:12:28,267 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 12 [2020-12-09 07:12:28,267 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 07:12:28,267 INFO L481 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2020-12-09 07:12:28,268 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-12-09 07:12:28,268 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2020-12-09 07:12:28,268 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-12-09 07:12:28,268 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 07:12:28,268 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1] [2020-12-09 07:12:28,468 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 07:12:28,469 INFO L429 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]=== [2020-12-09 07:12:28,470 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 07:12:28,470 INFO L82 PathProgramCache]: Analyzing trace with hash -1516021970, now seen corresponding path program 2 times [2020-12-09 07:12:28,471 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 07:12:28,471 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1983043990] [2020-12-09 07:12:28,471 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 07:12:28,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 07:12:28,635 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 6 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:12:28,635 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1983043990] [2020-12-09 07:12:28,635 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [953574655] [2020-12-09 07:12:28,635 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_30a406d9-f441-4710-a5e5-186db8501b7e/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 [2020-12-09 07:12:28,677 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2020-12-09 07:12:28,677 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-09 07:12:28,678 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 28 conjunts are in the unsatisfiable core [2020-12-09 07:12:28,679 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 07:12:28,824 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 6 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:12:28,824 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 07:12:28,915 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 6 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:12:28,915 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1488213006] [2020-12-09 07:12:28,916 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2020-12-09 07:12:28,916 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 07:12:28,917 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 07:12:28,917 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 07:12:28,917 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 07:12:29,161 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 07:12:29,172 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 07:12:29,351 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 07:12:29,486 WARN L197 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 50 [2020-12-09 07:12:29,650 WARN L197 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 62 [2020-12-09 07:12:29,900 WARN L197 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 77 DAG size of output: 64 [2020-12-09 07:12:30,146 WARN L197 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 55 [2020-12-09 07:12:30,290 WARN L197 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 51 [2020-12-09 07:12:30,291 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 07:12:30,291 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 07:12:30,291 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 19 [2020-12-09 07:12:30,291 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1693238656] [2020-12-09 07:12:30,292 INFO L461 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-12-09 07:12:30,292 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 07:12:30,292 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-12-09 07:12:30,292 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=616, Unknown=0, NotChecked=0, Total=702 [2020-12-09 07:12:30,292 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand 20 states. [2020-12-09 07:12:30,462 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 07:12:30,462 INFO L93 Difference]: Finished difference Result 29 states and 30 transitions. [2020-12-09 07:12:30,462 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-12-09 07:12:30,462 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 16 [2020-12-09 07:12:30,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 07:12:30,462 INFO L225 Difference]: With dead ends: 29 [2020-12-09 07:12:30,462 INFO L226 Difference]: Without dead ends: 20 [2020-12-09 07:12:30,463 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 27 SyntacticMatches, 2 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 2 DeprecatedPredicates, 291 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=143, Invalid=849, Unknown=0, NotChecked=0, Total=992 [2020-12-09 07:12:30,463 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-12-09 07:12:30,465 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 19. [2020-12-09 07:12:30,465 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-12-09 07:12:30,465 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2020-12-09 07:12:30,465 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 16 [2020-12-09 07:12:30,465 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 07:12:30,466 INFO L481 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2020-12-09 07:12:30,466 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-12-09 07:12:30,466 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2020-12-09 07:12:30,466 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-12-09 07:12:30,466 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 07:12:30,466 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1] [2020-12-09 07:12:30,667 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable82,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 07:12:30,668 INFO L429 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]=== [2020-12-09 07:12:30,669 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 07:12:30,669 INFO L82 PathProgramCache]: Analyzing trace with hash 1252271514, now seen corresponding path program 3 times [2020-12-09 07:12:30,670 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 07:12:30,670 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1698163074] [2020-12-09 07:12:30,670 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 07:12:30,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 07:12:30,774 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:12:30,775 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1698163074] [2020-12-09 07:12:30,775 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1208251975] [2020-12-09 07:12:30,775 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_30a406d9-f441-4710-a5e5-186db8501b7e/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 [2020-12-09 07:12:30,810 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-09 07:12:30,810 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-09 07:12:30,811 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 27 conjunts are in the unsatisfiable core [2020-12-09 07:12:30,812 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 07:12:30,917 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 1 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:12:30,917 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 07:12:31,054 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 4 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:12:31,054 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [638753357] [2020-12-09 07:12:31,056 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2020-12-09 07:12:31,056 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 07:12:31,056 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 07:12:31,056 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 07:12:31,056 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 07:12:31,336 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 07:12:31,521 WARN L197 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 92 DAG size of output: 57 [2020-12-09 07:12:32,066 WARN L197 SmtUtils]: Spent 304.00 ms on a formula simplification. DAG size of input: 87 DAG size of output: 72 [2020-12-09 07:12:32,510 WARN L197 SmtUtils]: Spent 362.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 81 [2020-12-09 07:12:32,943 WARN L197 SmtUtils]: Spent 339.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 77 [2020-12-09 07:12:33,060 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 07:12:33,060 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 07:12:33,060 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7, 7] total 19 [2020-12-09 07:12:33,060 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1546569125] [2020-12-09 07:12:33,060 INFO L461 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-12-09 07:12:33,061 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 07:12:33,061 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-12-09 07:12:33,061 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=703, Unknown=0, NotChecked=0, Total=812 [2020-12-09 07:12:33,062 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand 21 states. [2020-12-09 07:12:33,202 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 07:12:33,202 INFO L93 Difference]: Finished difference Result 24 states and 25 transitions. [2020-12-09 07:12:33,202 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-12-09 07:12:33,202 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 18 [2020-12-09 07:12:33,203 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 07:12:33,203 INFO L225 Difference]: With dead ends: 24 [2020-12-09 07:12:33,203 INFO L226 Difference]: Without dead ends: 24 [2020-12-09 07:12:33,203 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 30 SyntacticMatches, 1 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 250 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=180, Invalid=942, Unknown=0, NotChecked=0, Total=1122 [2020-12-09 07:12:33,204 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-12-09 07:12:33,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2020-12-09 07:12:33,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-12-09 07:12:33,205 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2020-12-09 07:12:33,205 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 18 [2020-12-09 07:12:33,205 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 07:12:33,205 INFO L481 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2020-12-09 07:12:33,205 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-12-09 07:12:33,205 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2020-12-09 07:12:33,206 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-12-09 07:12:33,206 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 07:12:33,206 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 2, 2, 1, 1, 1, 1] [2020-12-09 07:12:33,407 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable153,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 07:12:33,407 INFO L429 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]=== [2020-12-09 07:12:33,408 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 07:12:33,408 INFO L82 PathProgramCache]: Analyzing trace with hash 1813158201, now seen corresponding path program 4 times [2020-12-09 07:12:33,408 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 07:12:33,409 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1555048651] [2020-12-09 07:12:33,409 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 07:12:33,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 07:12:33,508 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 9 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:12:33,508 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1555048651] [2020-12-09 07:12:33,508 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1298238683] [2020-12-09 07:12:33,508 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_30a406d9-f441-4710-a5e5-186db8501b7e/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 [2020-12-09 07:12:33,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 07:12:33,546 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 34 conjunts are in the unsatisfiable core [2020-12-09 07:12:33,547 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 07:12:33,715 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 9 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:12:33,715 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 07:12:33,901 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 9 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:12:33,902 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [530917363] [2020-12-09 07:12:33,903 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2020-12-09 07:12:33,903 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 07:12:33,904 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 07:12:33,904 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 07:12:33,904 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 07:12:33,982 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 07:12:33,987 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 07:12:34,175 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 07:12:34,350 WARN L197 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 92 DAG size of output: 58 [2020-12-09 07:12:34,942 WARN L197 SmtUtils]: Spent 320.00 ms on a formula simplification. DAG size of input: 87 DAG size of output: 73 [2020-12-09 07:12:35,422 WARN L197 SmtUtils]: Spent 392.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 82 [2020-12-09 07:12:35,871 WARN L197 SmtUtils]: Spent 347.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 78 [2020-12-09 07:12:35,991 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 07:12:35,991 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 07:12:35,991 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11, 11] total 25 [2020-12-09 07:12:35,991 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2009179167] [2020-12-09 07:12:35,992 INFO L461 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-12-09 07:12:35,992 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 07:12:35,992 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-12-09 07:12:35,992 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=1005, Unknown=0, NotChecked=0, Total=1122 [2020-12-09 07:12:35,992 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand 26 states. [2020-12-09 07:12:36,196 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 07:12:36,196 INFO L93 Difference]: Finished difference Result 39 states and 40 transitions. [2020-12-09 07:12:36,196 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-12-09 07:12:36,197 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 22 [2020-12-09 07:12:36,197 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 07:12:36,197 INFO L225 Difference]: With dead ends: 39 [2020-12-09 07:12:36,197 INFO L226 Difference]: Without dead ends: 26 [2020-12-09 07:12:36,198 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 41 SyntacticMatches, 1 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 337 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=195, Invalid=1445, Unknown=0, NotChecked=0, Total=1640 [2020-12-09 07:12:36,198 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-12-09 07:12:36,200 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2020-12-09 07:12:36,200 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-12-09 07:12:36,200 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2020-12-09 07:12:36,200 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 22 [2020-12-09 07:12:36,200 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 07:12:36,200 INFO L481 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2020-12-09 07:12:36,200 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-12-09 07:12:36,201 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2020-12-09 07:12:36,201 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-12-09 07:12:36,201 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 07:12:36,201 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1] [2020-12-09 07:12:36,402 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable199 [2020-12-09 07:12:36,403 INFO L429 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]=== [2020-12-09 07:12:36,403 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 07:12:36,404 INFO L82 PathProgramCache]: Analyzing trace with hash -438180187, now seen corresponding path program 5 times [2020-12-09 07:12:36,404 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 07:12:36,404 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1349400620] [2020-12-09 07:12:36,405 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 07:12:36,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 07:12:36,520 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 1 proven. 29 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:12:36,520 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1349400620] [2020-12-09 07:12:36,520 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [22311707] [2020-12-09 07:12:36,520 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_30a406d9-f441-4710-a5e5-186db8501b7e/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 [2020-12-09 07:12:36,589 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2020-12-09 07:12:36,589 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-09 07:12:36,590 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 28 conjunts are in the unsatisfiable core [2020-12-09 07:12:36,591 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 07:12:36,693 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 4 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:12:36,693 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 07:12:36,796 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 4 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:12:36,797 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [190048879] [2020-12-09 07:12:36,798 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2020-12-09 07:12:36,798 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 07:12:36,799 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 07:12:36,799 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 07:12:36,799 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 07:12:37,048 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 07:12:37,220 WARN L197 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 92 DAG size of output: 58 [2020-12-09 07:12:37,804 WARN L197 SmtUtils]: Spent 326.00 ms on a formula simplification. DAG size of input: 87 DAG size of output: 73 [2020-12-09 07:12:38,332 WARN L197 SmtUtils]: Spent 448.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 82 [2020-12-09 07:12:38,767 WARN L197 SmtUtils]: Spent 346.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 78 [2020-12-09 07:12:38,881 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 07:12:38,881 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 07:12:38,881 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 9] total 22 [2020-12-09 07:12:38,881 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [221465446] [2020-12-09 07:12:38,882 INFO L461 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-12-09 07:12:38,882 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 07:12:38,882 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-12-09 07:12:38,882 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=851, Unknown=0, NotChecked=0, Total=992 [2020-12-09 07:12:38,883 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand 24 states. [2020-12-09 07:12:39,043 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 07:12:39,043 INFO L93 Difference]: Finished difference Result 30 states and 31 transitions. [2020-12-09 07:12:39,043 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-12-09 07:12:39,043 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 24 [2020-12-09 07:12:39,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 07:12:39,044 INFO L225 Difference]: With dead ends: 30 [2020-12-09 07:12:39,044 INFO L226 Difference]: Without dead ends: 30 [2020-12-09 07:12:39,044 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 47 SyntacticMatches, 1 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 368 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=234, Invalid=1172, Unknown=0, NotChecked=0, Total=1406 [2020-12-09 07:12:39,044 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-12-09 07:12:39,046 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-12-09 07:12:39,046 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-12-09 07:12:39,046 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2020-12-09 07:12:39,046 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 24 [2020-12-09 07:12:39,046 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 07:12:39,046 INFO L481 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2020-12-09 07:12:39,046 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-12-09 07:12:39,046 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2020-12-09 07:12:39,047 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-12-09 07:12:39,047 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 07:12:39,047 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 3, 3, 1, 1, 1, 1] [2020-12-09 07:12:39,247 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable248,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 07:12:39,248 INFO L429 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]=== [2020-12-09 07:12:39,249 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 07:12:39,249 INFO L82 PathProgramCache]: Analyzing trace with hash -1054679868, now seen corresponding path program 6 times [2020-12-09 07:12:39,249 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 07:12:39,250 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1698148375] [2020-12-09 07:12:39,250 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 07:12:39,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 07:12:39,404 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 12 proven. 33 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:12:39,404 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1698148375] [2020-12-09 07:12:39,404 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [911198619] [2020-12-09 07:12:39,405 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_30a406d9-f441-4710-a5e5-186db8501b7e/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 [2020-12-09 07:12:39,446 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-09 07:12:39,446 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-09 07:12:39,447 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 38 conjunts are in the unsatisfiable core [2020-12-09 07:12:39,448 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 07:12:39,593 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 12 proven. 33 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:12:39,593 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 07:12:39,712 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 12 proven. 33 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:12:39,712 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1923771815] [2020-12-09 07:12:39,713 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2020-12-09 07:12:39,713 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 07:12:39,714 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 07:12:39,714 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 07:12:39,714 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 07:12:39,952 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 07:12:40,124 WARN L197 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 92 DAG size of output: 57 [2020-12-09 07:12:40,689 WARN L197 SmtUtils]: Spent 293.00 ms on a formula simplification. DAG size of input: 87 DAG size of output: 72 [2020-12-09 07:12:41,125 WARN L197 SmtUtils]: Spent 355.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 81 [2020-12-09 07:12:41,544 WARN L197 SmtUtils]: Spent 333.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 77 [2020-12-09 07:12:41,660 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 07:12:41,660 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 07:12:41,660 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 22 [2020-12-09 07:12:41,660 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1432897387] [2020-12-09 07:12:41,661 INFO L461 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-12-09 07:12:41,661 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 07:12:41,661 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-12-09 07:12:41,661 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=830, Unknown=0, NotChecked=0, Total=930 [2020-12-09 07:12:41,661 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand 23 states. [2020-12-09 07:12:41,885 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 07:12:41,885 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2020-12-09 07:12:41,885 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-12-09 07:12:41,885 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 28 [2020-12-09 07:12:41,885 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 07:12:41,886 INFO L225 Difference]: With dead ends: 49 [2020-12-09 07:12:41,886 INFO L226 Difference]: Without dead ends: 32 [2020-12-09 07:12:41,886 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 61 SyntacticMatches, 4 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 300 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=182, Invalid=1378, Unknown=0, NotChecked=0, Total=1560 [2020-12-09 07:12:41,887 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-12-09 07:12:41,888 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-12-09 07:12:41,888 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-12-09 07:12:41,889 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2020-12-09 07:12:41,889 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 28 [2020-12-09 07:12:41,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 07:12:41,889 INFO L481 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2020-12-09 07:12:41,889 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-12-09 07:12:41,889 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2020-12-09 07:12:41,890 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-12-09 07:12:41,890 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 07:12:41,890 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1] [2020-12-09 07:12:42,091 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable295,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 07:12:42,091 INFO L429 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]=== [2020-12-09 07:12:42,092 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 07:12:42,092 INFO L82 PathProgramCache]: Analyzing trace with hash -190486224, now seen corresponding path program 7 times [2020-12-09 07:12:42,093 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 07:12:42,093 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2117268312] [2020-12-09 07:12:42,093 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 07:12:42,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 07:12:42,231 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 4 proven. 48 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:12:42,231 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2117268312] [2020-12-09 07:12:42,231 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2054447617] [2020-12-09 07:12:42,231 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_30a406d9-f441-4710-a5e5-186db8501b7e/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 [2020-12-09 07:12:42,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 07:12:42,272 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 35 conjunts are in the unsatisfiable core [2020-12-09 07:12:42,273 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 07:12:42,370 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 9 proven. 43 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:12:42,371 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 07:12:42,497 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 9 proven. 43 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:12:42,497 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [140906652] [2020-12-09 07:12:42,498 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2020-12-09 07:12:42,498 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 07:12:42,499 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 07:12:42,499 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 07:12:42,499 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 07:12:42,570 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 07:12:42,750 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 07:12:42,925 WARN L197 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 92 DAG size of output: 58 [2020-12-09 07:12:43,518 WARN L197 SmtUtils]: Spent 335.00 ms on a formula simplification. DAG size of input: 87 DAG size of output: 73 [2020-12-09 07:12:44,021 WARN L197 SmtUtils]: Spent 412.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 82 [2020-12-09 07:12:44,470 WARN L197 SmtUtils]: Spent 353.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 78 [2020-12-09 07:12:44,586 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 07:12:44,586 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 07:12:44,586 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11, 11] total 23 [2020-12-09 07:12:44,587 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1789581644] [2020-12-09 07:12:44,587 INFO L461 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-12-09 07:12:44,587 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 07:12:44,587 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-12-09 07:12:44,587 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=920, Unknown=0, NotChecked=0, Total=1056 [2020-12-09 07:12:44,588 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand 25 states. [2020-12-09 07:12:44,806 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 07:12:44,807 INFO L93 Difference]: Finished difference Result 36 states and 37 transitions. [2020-12-09 07:12:44,807 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-12-09 07:12:44,807 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 30 [2020-12-09 07:12:44,807 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 07:12:44,807 INFO L225 Difference]: With dead ends: 36 [2020-12-09 07:12:44,807 INFO L226 Difference]: Without dead ends: 36 [2020-12-09 07:12:44,808 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 65 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 395 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=248, Invalid=1312, Unknown=0, NotChecked=0, Total=1560 [2020-12-09 07:12:44,808 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-12-09 07:12:44,809 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-12-09 07:12:44,809 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-12-09 07:12:44,810 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2020-12-09 07:12:44,810 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 30 [2020-12-09 07:12:44,810 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 07:12:44,810 INFO L481 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2020-12-09 07:12:44,810 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-12-09 07:12:44,810 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2020-12-09 07:12:44,810 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-12-09 07:12:44,811 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 07:12:44,811 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 4, 4, 1, 1, 1, 1] [2020-12-09 07:12:45,011 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable341,9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 07:12:45,012 INFO L429 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]=== [2020-12-09 07:12:45,013 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 07:12:45,013 INFO L82 PathProgramCache]: Analyzing trace with hash -436461105, now seen corresponding path program 8 times [2020-12-09 07:12:45,014 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 07:12:45,014 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1909924539] [2020-12-09 07:12:45,014 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 07:12:45,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 07:12:45,183 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 15 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:12:45,184 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1909924539] [2020-12-09 07:12:45,184 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1115381886] [2020-12-09 07:12:45,184 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_30a406d9-f441-4710-a5e5-186db8501b7e/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 [2020-12-09 07:12:45,251 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2020-12-09 07:12:45,251 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-09 07:12:45,252 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 46 conjunts are in the unsatisfiable core [2020-12-09 07:12:45,254 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 07:12:45,471 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 15 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:12:45,471 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 07:12:45,613 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 15 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:12:45,613 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [410405423] [2020-12-09 07:12:45,614 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2020-12-09 07:12:45,614 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 07:12:45,614 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 07:12:45,614 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 07:12:45,614 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 07:12:45,789 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 07:12:45,829 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 07:12:45,954 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 07:12:46,261 WARN L197 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 62 [2020-12-09 07:12:46,534 WARN L197 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 77 DAG size of output: 64 [2020-12-09 07:12:46,820 WARN L197 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 55 [2020-12-09 07:12:46,975 WARN L197 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 51 [2020-12-09 07:12:46,975 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 07:12:46,976 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 07:12:46,976 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 25 [2020-12-09 07:12:46,976 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1192348951] [2020-12-09 07:12:46,976 INFO L461 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-12-09 07:12:46,976 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 07:12:46,976 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-12-09 07:12:46,977 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2020-12-09 07:12:46,977 INFO L87 Difference]: Start difference. First operand 35 states and 36 transitions. Second operand 26 states. [2020-12-09 07:12:47,367 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 07:12:47,367 INFO L93 Difference]: Finished difference Result 59 states and 60 transitions. [2020-12-09 07:12:47,367 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-12-09 07:12:47,367 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 34 [2020-12-09 07:12:47,368 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 07:12:47,368 INFO L225 Difference]: With dead ends: 59 [2020-12-09 07:12:47,368 INFO L226 Difference]: Without dead ends: 38 [2020-12-09 07:12:47,369 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 78 SyntacticMatches, 5 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 320 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=190, Invalid=1702, Unknown=0, NotChecked=0, Total=1892 [2020-12-09 07:12:47,369 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-12-09 07:12:47,370 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-12-09 07:12:47,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-12-09 07:12:47,370 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 38 transitions. [2020-12-09 07:12:47,370 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 38 transitions. Word has length 34 [2020-12-09 07:12:47,370 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 07:12:47,371 INFO L481 AbstractCegarLoop]: Abstraction has 37 states and 38 transitions. [2020-12-09 07:12:47,371 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-12-09 07:12:47,371 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 38 transitions. [2020-12-09 07:12:47,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-12-09 07:12:47,371 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 07:12:47,371 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1] [2020-12-09 07:12:47,572 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable391,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 07:12:47,572 INFO L429 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]=== [2020-12-09 07:12:47,572 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 07:12:47,572 INFO L82 PathProgramCache]: Analyzing trace with hash 696692027, now seen corresponding path program 9 times [2020-12-09 07:12:47,572 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 07:12:47,572 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [758471823] [2020-12-09 07:12:47,572 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 07:12:47,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 07:12:47,723 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 9 proven. 71 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:12:47,724 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [758471823] [2020-12-09 07:12:47,724 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1500296291] [2020-12-09 07:12:47,724 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_30a406d9-f441-4710-a5e5-186db8501b7e/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 [2020-12-09 07:12:47,777 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-09 07:12:47,777 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-09 07:12:47,778 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 42 conjunts are in the unsatisfiable core [2020-12-09 07:12:47,781 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 07:12:48,026 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 16 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:12:48,026 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 07:12:48,347 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 25 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:12:48,347 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [653866294] [2020-12-09 07:12:48,348 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2020-12-09 07:12:48,348 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 07:12:48,348 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 07:12:48,349 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 07:12:48,349 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 07:12:48,519 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 07:12:48,534 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 07:12:48,683 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 07:12:49,064 WARN L197 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 62 [2020-12-09 07:12:49,395 WARN L197 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 77 DAG size of output: 64 [2020-12-09 07:12:49,696 WARN L197 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 55 [2020-12-09 07:12:49,855 WARN L197 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 51 [2020-12-09 07:12:49,856 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 07:12:49,856 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 07:12:49,856 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13, 13] total 37 [2020-12-09 07:12:49,857 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1711823168] [2020-12-09 07:12:49,857 INFO L461 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-12-09 07:12:49,857 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 07:12:49,857 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-12-09 07:12:49,858 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=1837, Unknown=0, NotChecked=0, Total=2070 [2020-12-09 07:12:49,858 INFO L87 Difference]: Start difference. First operand 37 states and 38 transitions. Second operand 39 states. [2020-12-09 07:12:50,241 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 07:12:50,241 INFO L93 Difference]: Finished difference Result 42 states and 43 transitions. [2020-12-09 07:12:50,241 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-12-09 07:12:50,241 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 36 [2020-12-09 07:12:50,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 07:12:50,242 INFO L225 Difference]: With dead ends: 42 [2020-12-09 07:12:50,242 INFO L226 Difference]: Without dead ends: 42 [2020-12-09 07:12:50,243 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 73 SyntacticMatches, 1 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 798 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=433, Invalid=2429, Unknown=0, NotChecked=0, Total=2862 [2020-12-09 07:12:50,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-12-09 07:12:50,244 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2020-12-09 07:12:50,244 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-12-09 07:12:50,244 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 42 transitions. [2020-12-09 07:12:50,245 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 42 transitions. Word has length 36 [2020-12-09 07:12:50,245 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 07:12:50,245 INFO L481 AbstractCegarLoop]: Abstraction has 41 states and 42 transitions. [2020-12-09 07:12:50,245 INFO L482 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-12-09 07:12:50,245 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 42 transitions. [2020-12-09 07:12:50,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-12-09 07:12:50,245 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 07:12:50,245 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 5, 5, 1, 1, 1, 1] [2020-12-09 07:12:50,446 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable463 [2020-12-09 07:12:50,447 INFO L429 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]=== [2020-12-09 07:12:50,447 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 07:12:50,448 INFO L82 PathProgramCache]: Analyzing trace with hash -2127140774, now seen corresponding path program 10 times [2020-12-09 07:12:50,448 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 07:12:50,448 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1710448780] [2020-12-09 07:12:50,449 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 07:12:50,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 07:12:50,648 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 18 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:12:50,648 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1710448780] [2020-12-09 07:12:50,648 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1391220042] [2020-12-09 07:12:50,648 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_30a406d9-f441-4710-a5e5-186db8501b7e/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 [2020-12-09 07:12:50,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 07:12:50,697 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 52 conjunts are in the unsatisfiable core [2020-12-09 07:12:50,699 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 07:12:50,926 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 18 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:12:50,926 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 07:12:51,099 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 18 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:12:51,099 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [728086571] [2020-12-09 07:12:51,100 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2020-12-09 07:12:51,100 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 07:12:51,100 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 07:12:51,100 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 07:12:51,101 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 07:12:51,200 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 07:12:51,380 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 07:12:51,602 WARN L197 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 92 DAG size of output: 57 [2020-12-09 07:12:52,237 WARN L197 SmtUtils]: Spent 326.00 ms on a formula simplification. DAG size of input: 87 DAG size of output: 72 [2020-12-09 07:12:52,774 WARN L197 SmtUtils]: Spent 434.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 81 [2020-12-09 07:12:53,253 WARN L197 SmtUtils]: Spent 368.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 77 [2020-12-09 07:12:53,391 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 07:12:53,391 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 07:12:53,391 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 28 [2020-12-09 07:12:53,391 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1472203233] [2020-12-09 07:12:53,392 INFO L461 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-12-09 07:12:53,392 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 07:12:53,392 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-12-09 07:12:53,392 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=1218, Unknown=0, NotChecked=0, Total=1332 [2020-12-09 07:12:53,393 INFO L87 Difference]: Start difference. First operand 41 states and 42 transitions. Second operand 29 states. [2020-12-09 07:12:53,896 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 07:12:53,897 INFO L93 Difference]: Finished difference Result 69 states and 70 transitions. [2020-12-09 07:12:53,897 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-12-09 07:12:53,897 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 40 [2020-12-09 07:12:53,897 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 07:12:53,898 INFO L225 Difference]: With dead ends: 69 [2020-12-09 07:12:53,898 INFO L226 Difference]: Without dead ends: 44 [2020-12-09 07:12:53,898 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 94 SyntacticMatches, 5 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 432 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=226, Invalid=2224, Unknown=0, NotChecked=0, Total=2450 [2020-12-09 07:12:53,898 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-12-09 07:12:53,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2020-12-09 07:12:53,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-12-09 07:12:53,900 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2020-12-09 07:12:53,900 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 40 [2020-12-09 07:12:53,900 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 07:12:53,900 INFO L481 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2020-12-09 07:12:53,900 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-12-09 07:12:53,901 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2020-12-09 07:12:53,901 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-12-09 07:12:53,901 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 07:12:53,901 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 1, 1, 1, 1] [2020-12-09 07:12:54,101 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable535 [2020-12-09 07:12:54,102 INFO L429 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]=== [2020-12-09 07:12:54,102 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 07:12:54,103 INFO L82 PathProgramCache]: Analyzing trace with hash -930237754, now seen corresponding path program 11 times [2020-12-09 07:12:54,103 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 07:12:54,103 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1556021228] [2020-12-09 07:12:54,104 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 07:12:54,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 07:12:54,336 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 16 proven. 98 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:12:54,337 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1556021228] [2020-12-09 07:12:54,337 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1381679150] [2020-12-09 07:12:54,337 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_30a406d9-f441-4710-a5e5-186db8501b7e/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 [2020-12-09 07:12:54,481 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2020-12-09 07:12:54,481 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-09 07:12:54,482 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 42 conjunts are in the unsatisfiable core [2020-12-09 07:12:54,484 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 07:12:54,798 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 25 proven. 89 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:12:54,798 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 07:12:55,259 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 36 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:12:55,259 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [846909659] [2020-12-09 07:12:55,260 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2020-12-09 07:12:55,260 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 07:12:55,260 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 07:12:55,260 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 07:12:55,260 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 07:12:55,511 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 07:12:55,724 WARN L197 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 92 DAG size of output: 58 [2020-12-09 07:12:56,446 WARN L197 SmtUtils]: Spent 368.00 ms on a formula simplification. DAG size of input: 87 DAG size of output: 73 [2020-12-09 07:12:57,014 WARN L197 SmtUtils]: Spent 446.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 82 [2020-12-09 07:12:57,553 WARN L197 SmtUtils]: Spent 418.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 78 [2020-12-09 07:12:57,689 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 07:12:57,689 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 07:12:57,689 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 15, 15] total 44 [2020-12-09 07:12:57,689 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [18962537] [2020-12-09 07:12:57,690 INFO L461 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-12-09 07:12:57,690 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 07:12:57,690 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-12-09 07:12:57,691 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=350, Invalid=2512, Unknown=0, NotChecked=0, Total=2862 [2020-12-09 07:12:57,691 INFO L87 Difference]: Start difference. First operand 43 states and 44 transitions. Second operand 46 states. [2020-12-09 07:12:58,158 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 07:12:58,158 INFO L93 Difference]: Finished difference Result 48 states and 49 transitions. [2020-12-09 07:12:58,158 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-12-09 07:12:58,158 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 42 [2020-12-09 07:12:58,158 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 07:12:58,159 INFO L225 Difference]: With dead ends: 48 [2020-12-09 07:12:58,159 INFO L226 Difference]: Without dead ends: 48 [2020-12-09 07:12:58,160 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 86 SyntacticMatches, 0 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1162 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=638, Invalid=3268, Unknown=0, NotChecked=0, Total=3906 [2020-12-09 07:12:58,160 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-12-09 07:12:58,161 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 47. [2020-12-09 07:12:58,161 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-12-09 07:12:58,162 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 48 transitions. [2020-12-09 07:12:58,162 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 48 transitions. Word has length 42 [2020-12-09 07:12:58,162 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 07:12:58,162 INFO L481 AbstractCegarLoop]: Abstraction has 47 states and 48 transitions. [2020-12-09 07:12:58,162 INFO L482 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-12-09 07:12:58,162 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 48 transitions. [2020-12-09 07:12:58,163 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-12-09 07:12:58,163 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 07:12:58,163 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 6, 6, 1, 1, 1, 1] [2020-12-09 07:12:58,363 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable585 [2020-12-09 07:12:58,364 INFO L429 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]=== [2020-12-09 07:12:58,364 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 07:12:58,365 INFO L82 PathProgramCache]: Analyzing trace with hash -1831227291, now seen corresponding path program 12 times [2020-12-09 07:12:58,365 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 07:12:58,365 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [289308792] [2020-12-09 07:12:58,365 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 07:12:58,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 07:12:58,611 INFO L134 CoverageAnalysis]: Checked inductivity of 141 backedges. 21 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:12:58,611 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [289308792] [2020-12-09 07:12:58,611 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1001454020] [2020-12-09 07:12:58,611 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_30a406d9-f441-4710-a5e5-186db8501b7e/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 [2020-12-09 07:12:58,667 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-09 07:12:58,667 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-09 07:12:58,668 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 56 conjunts are in the unsatisfiable core [2020-12-09 07:12:58,670 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 07:12:58,921 INFO L134 CoverageAnalysis]: Checked inductivity of 141 backedges. 21 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:12:58,921 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 07:12:59,128 INFO L134 CoverageAnalysis]: Checked inductivity of 141 backedges. 21 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:12:59,128 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [936054676] [2020-12-09 07:12:59,129 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2020-12-09 07:12:59,129 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 07:12:59,129 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 07:12:59,129 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 07:12:59,129 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 07:12:59,204 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 07:12:59,396 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 07:12:59,620 WARN L197 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 92 DAG size of output: 57 [2020-12-09 07:13:00,331 WARN L197 SmtUtils]: Spent 364.00 ms on a formula simplification. DAG size of input: 87 DAG size of output: 72 [2020-12-09 07:13:00,896 WARN L197 SmtUtils]: Spent 445.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 81 [2020-12-09 07:13:01,399 WARN L197 SmtUtils]: Spent 376.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 77 [2020-12-09 07:13:01,537 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 07:13:01,537 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 07:13:01,538 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 31 [2020-12-09 07:13:01,538 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [258158842] [2020-12-09 07:13:01,538 INFO L461 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-12-09 07:13:01,538 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 07:13:01,538 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-12-09 07:13:01,539 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=121, Invalid=1439, Unknown=0, NotChecked=0, Total=1560 [2020-12-09 07:13:01,539 INFO L87 Difference]: Start difference. First operand 47 states and 48 transitions. Second operand 32 states. [2020-12-09 07:13:02,159 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 07:13:02,160 INFO L93 Difference]: Finished difference Result 79 states and 80 transitions. [2020-12-09 07:13:02,160 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-12-09 07:13:02,160 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 46 [2020-12-09 07:13:02,160 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 07:13:02,161 INFO L225 Difference]: With dead ends: 79 [2020-12-09 07:13:02,161 INFO L226 Difference]: Without dead ends: 50 [2020-12-09 07:13:02,162 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 110 SyntacticMatches, 6 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 513 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=248, Invalid=2722, Unknown=0, NotChecked=0, Total=2970 [2020-12-09 07:13:02,162 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-12-09 07:13:02,163 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 49. [2020-12-09 07:13:02,163 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-12-09 07:13:02,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 50 transitions. [2020-12-09 07:13:02,164 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 50 transitions. Word has length 46 [2020-12-09 07:13:02,164 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 07:13:02,164 INFO L481 AbstractCegarLoop]: Abstraction has 49 states and 50 transitions. [2020-12-09 07:13:02,164 INFO L482 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-12-09 07:13:02,164 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 50 transitions. [2020-12-09 07:13:02,164 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-12-09 07:13:02,164 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 07:13:02,165 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1] [2020-12-09 07:13:02,365 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable631 [2020-12-09 07:13:02,365 INFO L429 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]=== [2020-12-09 07:13:02,366 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 07:13:02,366 INFO L82 PathProgramCache]: Analyzing trace with hash -1691190831, now seen corresponding path program 13 times [2020-12-09 07:13:02,366 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 07:13:02,366 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [981170458] [2020-12-09 07:13:02,366 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 07:13:02,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 07:13:02,593 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 25 proven. 129 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:13:02,593 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [981170458] [2020-12-09 07:13:02,594 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1718932506] [2020-12-09 07:13:02,594 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_30a406d9-f441-4710-a5e5-186db8501b7e/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 [2020-12-09 07:13:02,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 07:13:02,645 INFO L263 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 50 conjunts are in the unsatisfiable core [2020-12-09 07:13:02,646 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 07:13:02,846 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 36 proven. 118 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:13:02,846 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 07:13:03,112 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 36 proven. 118 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:13:03,112 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1817235244] [2020-12-09 07:13:03,113 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2020-12-09 07:13:03,113 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 07:13:03,113 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 07:13:03,113 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 07:13:03,113 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 07:13:03,303 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 07:13:03,313 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 07:13:03,467 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 07:13:03,611 WARN L197 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 50 [2020-12-09 07:13:03,844 WARN L197 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 62 [2020-12-09 07:13:04,175 WARN L197 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 77 DAG size of output: 64 [2020-12-09 07:13:04,514 WARN L197 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 55 [2020-12-09 07:13:04,693 WARN L197 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 51 [2020-12-09 07:13:04,694 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 07:13:04,694 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 07:13:04,694 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 17, 17] total 35 [2020-12-09 07:13:04,694 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [805745738] [2020-12-09 07:13:04,694 INFO L461 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-12-09 07:13:04,695 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 07:13:04,695 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-12-09 07:13:04,695 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=214, Invalid=1678, Unknown=0, NotChecked=0, Total=1892 [2020-12-09 07:13:04,695 INFO L87 Difference]: Start difference. First operand 49 states and 50 transitions. Second operand 37 states. [2020-12-09 07:13:05,158 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 07:13:05,158 INFO L93 Difference]: Finished difference Result 54 states and 55 transitions. [2020-12-09 07:13:05,159 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-12-09 07:13:05,159 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 48 [2020-12-09 07:13:05,159 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 07:13:05,159 INFO L225 Difference]: With dead ends: 54 [2020-12-09 07:13:05,159 INFO L226 Difference]: Without dead ends: 54 [2020-12-09 07:13:05,160 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 114 SyntacticMatches, 2 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 744 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=449, Invalid=2413, Unknown=0, NotChecked=0, Total=2862 [2020-12-09 07:13:05,160 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-12-09 07:13:05,162 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2020-12-09 07:13:05,162 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-12-09 07:13:05,162 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 54 transitions. [2020-12-09 07:13:05,162 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 54 transitions. Word has length 48 [2020-12-09 07:13:05,162 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 07:13:05,162 INFO L481 AbstractCegarLoop]: Abstraction has 53 states and 54 transitions. [2020-12-09 07:13:05,162 INFO L482 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-12-09 07:13:05,162 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 54 transitions. [2020-12-09 07:13:05,163 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-12-09 07:13:05,163 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 07:13:05,163 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 7, 7, 1, 1, 1, 1] [2020-12-09 07:13:05,363 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable680,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 07:13:05,364 INFO L429 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]=== [2020-12-09 07:13:05,364 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 07:13:05,365 INFO L82 PathProgramCache]: Analyzing trace with hash 1750989296, now seen corresponding path program 14 times [2020-12-09 07:13:05,365 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 07:13:05,365 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1906592968] [2020-12-09 07:13:05,365 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 07:13:05,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 07:13:05,699 INFO L134 CoverageAnalysis]: Checked inductivity of 185 backedges. 24 proven. 161 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:13:05,699 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1906592968] [2020-12-09 07:13:05,700 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [639710691] [2020-12-09 07:13:05,700 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_30a406d9-f441-4710-a5e5-186db8501b7e/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 [2020-12-09 07:13:05,884 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2020-12-09 07:13:05,884 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-09 07:13:05,886 INFO L263 TraceCheckSpWp]: Trace formula consists of 251 conjuncts, 64 conjunts are in the unsatisfiable core [2020-12-09 07:13:05,887 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 07:13:06,237 INFO L134 CoverageAnalysis]: Checked inductivity of 185 backedges. 24 proven. 161 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:13:06,237 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 07:13:06,504 INFO L134 CoverageAnalysis]: Checked inductivity of 185 backedges. 24 proven. 161 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:13:06,504 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [98291977] [2020-12-09 07:13:06,505 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2020-12-09 07:13:06,505 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 07:13:06,506 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 07:13:06,506 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 07:13:06,506 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 07:13:06,582 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 07:13:06,755 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 07:13:06,975 WARN L197 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 92 DAG size of output: 58 [2020-12-09 07:13:07,757 WARN L197 SmtUtils]: Spent 378.00 ms on a formula simplification. DAG size of input: 87 DAG size of output: 73 [2020-12-09 07:13:08,376 WARN L197 SmtUtils]: Spent 479.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 82 [2020-12-09 07:13:08,931 WARN L197 SmtUtils]: Spent 416.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 78 [2020-12-09 07:13:09,082 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 07:13:09,082 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 07:13:09,082 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 34 [2020-12-09 07:13:09,082 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1638468587] [2020-12-09 07:13:09,082 INFO L461 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-12-09 07:13:09,082 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 07:13:09,083 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-12-09 07:13:09,083 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=1678, Unknown=0, NotChecked=0, Total=1806 [2020-12-09 07:13:09,083 INFO L87 Difference]: Start difference. First operand 53 states and 54 transitions. Second operand 35 states. [2020-12-09 07:13:09,938 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 07:13:09,938 INFO L93 Difference]: Finished difference Result 89 states and 90 transitions. [2020-12-09 07:13:09,939 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-12-09 07:13:09,939 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 52 [2020-12-09 07:13:09,939 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 07:13:09,939 INFO L225 Difference]: With dead ends: 89 [2020-12-09 07:13:09,939 INFO L226 Difference]: Without dead ends: 56 [2020-12-09 07:13:09,940 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 191 GetRequests, 126 SyntacticMatches, 7 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 601 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=270, Invalid=3270, Unknown=0, NotChecked=0, Total=3540 [2020-12-09 07:13:09,940 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-12-09 07:13:09,941 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2020-12-09 07:13:09,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-12-09 07:13:09,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 56 transitions. [2020-12-09 07:13:09,942 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 56 transitions. Word has length 52 [2020-12-09 07:13:09,942 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 07:13:09,942 INFO L481 AbstractCegarLoop]: Abstraction has 55 states and 56 transitions. [2020-12-09 07:13:09,942 INFO L482 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-12-09 07:13:09,942 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 56 transitions. [2020-12-09 07:13:09,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-12-09 07:13:09,942 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 07:13:09,943 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 1, 1, 1, 1] [2020-12-09 07:13:10,143 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable751 [2020-12-09 07:13:10,144 INFO L429 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]=== [2020-12-09 07:13:10,144 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 07:13:10,145 INFO L82 PathProgramCache]: Analyzing trace with hash -463666596, now seen corresponding path program 15 times [2020-12-09 07:13:10,145 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 07:13:10,145 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1109940317] [2020-12-09 07:13:10,145 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 07:13:10,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 07:13:10,444 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 36 proven. 164 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:13:10,444 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1109940317] [2020-12-09 07:13:10,444 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1165131314] [2020-12-09 07:13:10,444 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_30a406d9-f441-4710-a5e5-186db8501b7e/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 [2020-12-09 07:13:10,507 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-09 07:13:10,507 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-09 07:13:10,508 INFO L263 TraceCheckSpWp]: Trace formula consists of 261 conjuncts, 57 conjunts are in the unsatisfiable core [2020-12-09 07:13:10,509 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 07:13:10,945 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 49 proven. 151 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:13:10,945 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 07:13:11,641 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 64 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:13:11,641 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [140938053] [2020-12-09 07:13:11,642 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2020-12-09 07:13:11,642 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 07:13:11,642 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 07:13:11,642 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 07:13:11,642 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 07:13:11,731 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 07:13:11,738 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 07:13:11,931 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 07:13:12,169 WARN L197 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 92 DAG size of output: 58 [2020-12-09 07:13:12,939 WARN L197 SmtUtils]: Spent 365.00 ms on a formula simplification. DAG size of input: 87 DAG size of output: 73 [2020-12-09 07:13:13,559 WARN L197 SmtUtils]: Spent 466.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 82 [2020-12-09 07:13:14,188 WARN L197 SmtUtils]: Spent 450.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 78 [2020-12-09 07:13:14,352 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 07:13:14,352 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 07:13:14,352 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 19, 19] total 55 [2020-12-09 07:13:14,352 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1033354490] [2020-12-09 07:13:14,352 INFO L461 AbstractCegarLoop]: Interpolant automaton has 57 states [2020-12-09 07:13:14,352 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 07:13:14,353 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2020-12-09 07:13:14,354 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=457, Invalid=3703, Unknown=0, NotChecked=0, Total=4160 [2020-12-09 07:13:14,354 INFO L87 Difference]: Start difference. First operand 55 states and 56 transitions. Second operand 57 states. [2020-12-09 07:13:15,001 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 07:13:15,001 INFO L93 Difference]: Finished difference Result 60 states and 61 transitions. [2020-12-09 07:13:15,002 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-12-09 07:13:15,002 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 54 [2020-12-09 07:13:15,002 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 07:13:15,002 INFO L225 Difference]: With dead ends: 60 [2020-12-09 07:13:15,002 INFO L226 Difference]: Without dead ends: 60 [2020-12-09 07:13:15,004 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 189 GetRequests, 114 SyntacticMatches, 1 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1801 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=849, Invalid=4851, Unknown=0, NotChecked=0, Total=5700 [2020-12-09 07:13:15,004 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-12-09 07:13:15,005 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2020-12-09 07:13:15,005 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-12-09 07:13:15,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 60 transitions. [2020-12-09 07:13:15,005 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 60 transitions. Word has length 54 [2020-12-09 07:13:15,005 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 07:13:15,005 INFO L481 AbstractCegarLoop]: Abstraction has 59 states and 60 transitions. [2020-12-09 07:13:15,006 INFO L482 AbstractCegarLoop]: Interpolant automaton has 57 states. [2020-12-09 07:13:15,006 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 60 transitions. [2020-12-09 07:13:15,006 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-12-09 07:13:15,006 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 07:13:15,006 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 8, 8, 1, 1, 1, 1] [2020-12-09 07:13:15,207 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable797,17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 07:13:15,207 INFO L429 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]=== [2020-12-09 07:13:15,208 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 07:13:15,208 INFO L82 PathProgramCache]: Analyzing trace with hash -1867823877, now seen corresponding path program 16 times [2020-12-09 07:13:15,208 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 07:13:15,209 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2111967133] [2020-12-09 07:13:15,209 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 07:13:15,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 07:13:15,611 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 27 proven. 208 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:13:15,612 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2111967133] [2020-12-09 07:13:15,612 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [425856710] [2020-12-09 07:13:15,612 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_30a406d9-f441-4710-a5e5-186db8501b7e/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 [2020-12-09 07:13:15,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 07:13:15,682 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 70 conjunts are in the unsatisfiable core [2020-12-09 07:13:15,684 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 07:13:16,055 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 27 proven. 208 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:13:16,055 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 07:13:16,362 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 27 proven. 208 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:13:16,362 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [243789730] [2020-12-09 07:13:16,363 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2020-12-09 07:13:16,363 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 07:13:16,363 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 07:13:16,363 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 07:13:16,363 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 07:13:16,550 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 07:13:16,589 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 07:13:16,727 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 07:13:16,901 WARN L197 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 50 [2020-12-09 07:13:17,161 WARN L197 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 62 [2020-12-09 07:13:17,536 WARN L197 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 77 DAG size of output: 64 [2020-12-09 07:13:17,908 WARN L197 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 55 [2020-12-09 07:13:18,108 WARN L197 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 51 [2020-12-09 07:13:18,110 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 07:13:18,110 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 07:13:18,110 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 37 [2020-12-09 07:13:18,110 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1224691144] [2020-12-09 07:13:18,110 INFO L461 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-12-09 07:13:18,110 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 07:13:18,111 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-12-09 07:13:18,111 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=121, Invalid=1859, Unknown=0, NotChecked=0, Total=1980 [2020-12-09 07:13:18,111 INFO L87 Difference]: Start difference. First operand 59 states and 60 transitions. Second operand 38 states. [2020-12-09 07:13:19,045 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 07:13:19,045 INFO L93 Difference]: Finished difference Result 99 states and 100 transitions. [2020-12-09 07:13:19,045 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-12-09 07:13:19,045 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 58 [2020-12-09 07:13:19,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 07:13:19,046 INFO L225 Difference]: With dead ends: 99 [2020-12-09 07:13:19,046 INFO L226 Difference]: Without dead ends: 62 [2020-12-09 07:13:19,047 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 213 GetRequests, 143 SyntacticMatches, 8 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 620 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=278, Invalid=3754, Unknown=0, NotChecked=0, Total=4032 [2020-12-09 07:13:19,047 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-12-09 07:13:19,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2020-12-09 07:13:19,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-12-09 07:13:19,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 62 transitions. [2020-12-09 07:13:19,048 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 62 transitions. Word has length 58 [2020-12-09 07:13:19,048 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 07:13:19,048 INFO L481 AbstractCegarLoop]: Abstraction has 61 states and 62 transitions. [2020-12-09 07:13:19,048 INFO L482 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-12-09 07:13:19,048 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 62 transitions. [2020-12-09 07:13:19,049 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-12-09 07:13:19,049 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 07:13:19,049 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 1, 1, 1, 1] [2020-12-09 07:13:19,249 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable846,18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 07:13:19,250 INFO L429 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]=== [2020-12-09 07:13:19,250 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 07:13:19,251 INFO L82 PathProgramCache]: Analyzing trace with hash 1415924839, now seen corresponding path program 17 times [2020-12-09 07:13:19,251 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 07:13:19,251 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [691841895] [2020-12-09 07:13:19,252 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 07:13:19,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 07:13:19,541 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 49 proven. 203 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:13:19,541 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [691841895] [2020-12-09 07:13:19,541 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [478415397] [2020-12-09 07:13:19,541 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_30a406d9-f441-4710-a5e5-186db8501b7e/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 [2020-12-09 07:13:19,835 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2020-12-09 07:13:19,835 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-09 07:13:19,837 INFO L263 TraceCheckSpWp]: Trace formula consists of 287 conjuncts, 54 conjunts are in the unsatisfiable core [2020-12-09 07:13:19,838 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 07:13:20,398 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 64 proven. 188 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:13:20,398 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 07:13:21,259 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 81 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:13:21,259 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [13214775] [2020-12-09 07:13:21,260 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2020-12-09 07:13:21,260 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 07:13:21,260 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 07:13:21,260 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 07:13:21,260 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 07:13:21,506 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 07:13:21,760 WARN L197 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 92 DAG size of output: 57 [2020-12-09 07:13:22,495 WARN L197 SmtUtils]: Spent 345.00 ms on a formula simplification. DAG size of input: 87 DAG size of output: 72 [2020-12-09 07:13:23,071 WARN L197 SmtUtils]: Spent 431.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 81 [2020-12-09 07:13:23,617 WARN L197 SmtUtils]: Spent 388.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 77 [2020-12-09 07:13:23,763 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 07:13:23,763 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 07:13:23,763 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 21, 21] total 62 [2020-12-09 07:13:23,763 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1585559187] [2020-12-09 07:13:23,764 INFO L461 AbstractCegarLoop]: Interpolant automaton has 64 states [2020-12-09 07:13:23,764 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 07:13:23,764 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2020-12-09 07:13:23,764 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=629, Invalid=4483, Unknown=0, NotChecked=0, Total=5112 [2020-12-09 07:13:23,764 INFO L87 Difference]: Start difference. First operand 61 states and 62 transitions. Second operand 64 states. [2020-12-09 07:13:24,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 07:13:24,487 INFO L93 Difference]: Finished difference Result 66 states and 67 transitions. [2020-12-09 07:13:24,487 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-12-09 07:13:24,487 INFO L78 Accepts]: Start accepts. Automaton has 64 states. Word has length 60 [2020-12-09 07:13:24,488 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 07:13:24,488 INFO L225 Difference]: With dead ends: 66 [2020-12-09 07:13:24,488 INFO L226 Difference]: Without dead ends: 66 [2020-12-09 07:13:24,488 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 128 SyntacticMatches, 0 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2200 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=1160, Invalid=5812, Unknown=0, NotChecked=0, Total=6972 [2020-12-09 07:13:24,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-12-09 07:13:24,489 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2020-12-09 07:13:24,489 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-12-09 07:13:24,490 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 66 transitions. [2020-12-09 07:13:24,490 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 66 transitions. Word has length 60 [2020-12-09 07:13:24,490 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 07:13:24,490 INFO L481 AbstractCegarLoop]: Abstraction has 65 states and 66 transitions. [2020-12-09 07:13:24,490 INFO L482 AbstractCegarLoop]: Interpolant automaton has 64 states. [2020-12-09 07:13:24,490 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 66 transitions. [2020-12-09 07:13:24,490 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-12-09 07:13:24,490 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 07:13:24,490 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 9, 9, 1, 1, 1, 1] [2020-12-09 07:13:24,691 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable917,19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 07:13:24,692 INFO L429 AbstractCegarLoop]: === Iteration 27 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2020-12-09 07:13:24,692 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 07:13:24,692 INFO L82 PathProgramCache]: Analyzing trace with hash -803630714, now seen corresponding path program 18 times [2020-12-09 07:13:24,693 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 07:13:24,693 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1097655107] [2020-12-09 07:13:24,693 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 07:13:24,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 07:13:25,132 INFO L134 CoverageAnalysis]: Checked inductivity of 291 backedges. 30 proven. 261 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:13:25,132 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1097655107] [2020-12-09 07:13:25,132 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [164587061] [2020-12-09 07:13:25,132 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_30a406d9-f441-4710-a5e5-186db8501b7e/bin/utaipan/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 07:13:25,244 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-09 07:13:25,244 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-09 07:13:25,246 INFO L263 TraceCheckSpWp]: Trace formula consists of 303 conjuncts, 74 conjunts are in the unsatisfiable core [2020-12-09 07:13:25,247 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 07:13:25,703 INFO L134 CoverageAnalysis]: Checked inductivity of 291 backedges. 30 proven. 261 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:13:25,703 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 07:13:26,080 INFO L134 CoverageAnalysis]: Checked inductivity of 291 backedges. 30 proven. 261 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:13:26,080 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [334244518] [2020-12-09 07:13:26,081 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2020-12-09 07:13:26,081 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 07:13:26,081 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 07:13:26,081 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 07:13:26,081 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 07:13:26,142 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 07:13:26,321 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 07:13:26,576 WARN L197 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 92 DAG size of output: 58 [2020-12-09 07:13:27,389 WARN L197 SmtUtils]: Spent 389.00 ms on a formula simplification. DAG size of input: 87 DAG size of output: 73 [2020-12-09 07:13:28,013 WARN L197 SmtUtils]: Spent 439.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 82 [2020-12-09 07:13:28,580 WARN L197 SmtUtils]: Spent 419.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 78 [2020-12-09 07:13:28,740 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 07:13:28,741 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 07:13:28,741 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 40 [2020-12-09 07:13:28,741 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [584915794] [2020-12-09 07:13:28,741 INFO L461 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-12-09 07:13:28,741 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 07:13:28,741 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-12-09 07:13:28,741 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=2210, Unknown=0, NotChecked=0, Total=2352 [2020-12-09 07:13:28,742 INFO L87 Difference]: Start difference. First operand 65 states and 66 transitions. Second operand 41 states. [2020-12-09 07:13:29,935 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 07:13:29,935 INFO L93 Difference]: Finished difference Result 109 states and 110 transitions. [2020-12-09 07:13:29,935 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-12-09 07:13:29,935 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 64 [2020-12-09 07:13:29,936 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 07:13:29,936 INFO L225 Difference]: With dead ends: 109 [2020-12-09 07:13:29,936 INFO L226 Difference]: Without dead ends: 68 [2020-12-09 07:13:29,936 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 235 GetRequests, 158 SyntacticMatches, 9 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 798 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=314, Invalid=4516, Unknown=0, NotChecked=0, Total=4830 [2020-12-09 07:13:29,936 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-12-09 07:13:29,937 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2020-12-09 07:13:29,937 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-12-09 07:13:29,937 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 68 transitions. [2020-12-09 07:13:29,937 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 68 transitions. Word has length 64 [2020-12-09 07:13:29,938 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 07:13:29,938 INFO L481 AbstractCegarLoop]: Abstraction has 67 states and 68 transitions. [2020-12-09 07:13:29,938 INFO L482 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-12-09 07:13:29,938 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 68 transitions. [2020-12-09 07:13:29,938 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-12-09 07:13:29,938 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 07:13:29,938 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 1, 1, 1, 1] [2020-12-09 07:13:30,139 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable964 [2020-12-09 07:13:30,139 INFO L429 AbstractCegarLoop]: === Iteration 28 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2020-12-09 07:13:30,140 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 07:13:30,140 INFO L82 PathProgramCache]: Analyzing trace with hash -49063950, now seen corresponding path program 19 times [2020-12-09 07:13:30,140 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 07:13:30,141 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1925749640] [2020-12-09 07:13:30,141 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 07:13:30,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 07:13:30,589 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 64 proven. 246 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:13:30,589 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1925749640] [2020-12-09 07:13:30,589 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [237819032] [2020-12-09 07:13:30,589 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_30a406d9-f441-4710-a5e5-186db8501b7e/bin/utaipan/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 07:13:30,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 07:13:30,655 INFO L263 TraceCheckSpWp]: Trace formula consists of 313 conjuncts, 65 conjunts are in the unsatisfiable core [2020-12-09 07:13:30,657 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 07:13:31,035 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 81 proven. 229 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:13:31,035 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 07:13:31,524 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 81 proven. 229 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:13:31,525 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1514889533] [2020-12-09 07:13:31,526 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2020-12-09 07:13:31,526 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 07:13:31,526 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 07:13:31,526 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 07:13:31,526 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 07:13:31,617 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 07:13:31,807 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 07:13:32,058 WARN L197 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 92 DAG size of output: 58 [2020-12-09 07:13:32,834 WARN L197 SmtUtils]: Spent 381.00 ms on a formula simplification. DAG size of input: 87 DAG size of output: 73 [2020-12-09 07:13:33,461 WARN L197 SmtUtils]: Spent 482.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 82 [2020-12-09 07:13:34,024 WARN L197 SmtUtils]: Spent 430.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 78 [2020-12-09 07:13:34,180 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 07:13:34,180 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 07:13:34,180 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 23, 23] total 47 [2020-12-09 07:13:34,180 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1430083385] [2020-12-09 07:13:34,180 INFO L461 AbstractCegarLoop]: Interpolant automaton has 49 states [2020-12-09 07:13:34,180 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 07:13:34,181 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2020-12-09 07:13:34,181 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=358, Invalid=2834, Unknown=0, NotChecked=0, Total=3192 [2020-12-09 07:13:34,181 INFO L87 Difference]: Start difference. First operand 67 states and 68 transitions. Second operand 49 states. [2020-12-09 07:13:35,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 07:13:35,022 INFO L93 Difference]: Finished difference Result 72 states and 73 transitions. [2020-12-09 07:13:35,023 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-12-09 07:13:35,023 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 66 [2020-12-09 07:13:35,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 07:13:35,023 INFO L225 Difference]: With dead ends: 72 [2020-12-09 07:13:35,023 INFO L226 Difference]: Without dead ends: 72 [2020-12-09 07:13:35,024 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 161 SyntacticMatches, 2 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1343 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=761, Invalid=4069, Unknown=0, NotChecked=0, Total=4830 [2020-12-09 07:13:35,024 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-12-09 07:13:35,024 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2020-12-09 07:13:35,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-12-09 07:13:35,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 72 transitions. [2020-12-09 07:13:35,025 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 72 transitions. Word has length 66 [2020-12-09 07:13:35,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 07:13:35,025 INFO L481 AbstractCegarLoop]: Abstraction has 71 states and 72 transitions. [2020-12-09 07:13:35,025 INFO L482 AbstractCegarLoop]: Interpolant automaton has 49 states. [2020-12-09 07:13:35,025 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 72 transitions. [2020-12-09 07:13:35,025 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2020-12-09 07:13:35,025 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 07:13:35,025 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 10, 10, 1, 1, 1, 1] [2020-12-09 07:13:35,226 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1010,21 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 07:13:35,227 INFO L429 AbstractCegarLoop]: === Iteration 29 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2020-12-09 07:13:35,227 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 07:13:35,227 INFO L82 PathProgramCache]: Analyzing trace with hash 342941585, now seen corresponding path program 20 times [2020-12-09 07:13:35,228 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 07:13:35,228 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2013065670] [2020-12-09 07:13:35,228 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 07:13:35,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 07:13:35,808 INFO L134 CoverageAnalysis]: Checked inductivity of 353 backedges. 33 proven. 320 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:13:35,808 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2013065670] [2020-12-09 07:13:35,808 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1922485400] [2020-12-09 07:13:35,808 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_30a406d9-f441-4710-a5e5-186db8501b7e/bin/utaipan/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 07:13:36,404 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2020-12-09 07:13:36,404 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-09 07:13:36,407 INFO L263 TraceCheckSpWp]: Trace formula consists of 329 conjuncts, 82 conjunts are in the unsatisfiable core [2020-12-09 07:13:36,408 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 07:13:36,894 INFO L134 CoverageAnalysis]: Checked inductivity of 353 backedges. 33 proven. 320 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:13:36,894 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 07:13:37,296 INFO L134 CoverageAnalysis]: Checked inductivity of 353 backedges. 33 proven. 320 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:13:37,296 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1072592867] [2020-12-09 07:13:37,297 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2020-12-09 07:13:37,297 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 07:13:37,297 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 07:13:37,297 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 07:13:37,297 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 07:13:37,529 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 07:13:37,537 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 07:13:37,717 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 07:13:38,238 WARN L197 SmtUtils]: Spent 215.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 62 [2020-12-09 07:13:38,658 WARN L197 SmtUtils]: Spent 178.00 ms on a formula simplification. DAG size of input: 77 DAG size of output: 64 [2020-12-09 07:13:38,846 WARN L197 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 46 [2020-12-09 07:13:39,116 WARN L197 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 55 [2020-12-09 07:13:39,318 WARN L197 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 51 [2020-12-09 07:13:39,320 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 07:13:39,320 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 07:13:39,320 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 43 [2020-12-09 07:13:39,320 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1804071147] [2020-12-09 07:13:39,320 INFO L461 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-12-09 07:13:39,320 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 07:13:39,321 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-12-09 07:13:39,321 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=2415, Unknown=0, NotChecked=0, Total=2550 [2020-12-09 07:13:39,321 INFO L87 Difference]: Start difference. First operand 71 states and 72 transitions. Second operand 44 states. [2020-12-09 07:13:40,945 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 07:13:40,946 INFO L93 Difference]: Finished difference Result 119 states and 120 transitions. [2020-12-09 07:13:40,946 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-12-09 07:13:40,946 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 70 [2020-12-09 07:13:40,946 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 07:13:40,947 INFO L225 Difference]: With dead ends: 119 [2020-12-09 07:13:40,947 INFO L226 Difference]: Without dead ends: 74 [2020-12-09 07:13:40,947 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 257 GetRequests, 175 SyntacticMatches, 10 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 817 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=322, Invalid=5080, Unknown=0, NotChecked=0, Total=5402 [2020-12-09 07:13:40,947 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2020-12-09 07:13:40,948 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2020-12-09 07:13:40,948 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-12-09 07:13:40,948 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 74 transitions. [2020-12-09 07:13:40,948 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 74 transitions. Word has length 70 [2020-12-09 07:13:40,948 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 07:13:40,949 INFO L481 AbstractCegarLoop]: Abstraction has 73 states and 74 transitions. [2020-12-09 07:13:40,949 INFO L482 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-12-09 07:13:40,949 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 74 transitions. [2020-12-09 07:13:40,949 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-12-09 07:13:40,949 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 07:13:40,949 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 11, 11, 1, 1, 1, 1] [2020-12-09 07:13:41,150 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1060,22 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 07:13:41,150 INFO L429 AbstractCegarLoop]: === Iteration 30 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2020-12-09 07:13:41,151 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 07:13:41,151 INFO L82 PathProgramCache]: Analyzing trace with hash 1168057597, now seen corresponding path program 21 times [2020-12-09 07:13:41,151 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 07:13:41,152 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [523892574] [2020-12-09 07:13:41,152 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 07:13:41,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 07:13:41,624 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 81 proven. 293 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:13:41,624 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [523892574] [2020-12-09 07:13:41,624 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1542452969] [2020-12-09 07:13:41,624 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_30a406d9-f441-4710-a5e5-186db8501b7e/bin/utaipan/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 07:13:41,781 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-09 07:13:41,781 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-09 07:13:41,783 INFO L263 TraceCheckSpWp]: Trace formula consists of 339 conjuncts, 72 conjunts are in the unsatisfiable core [2020-12-09 07:13:41,784 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 07:13:42,542 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 100 proven. 274 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:13:42,542 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 07:13:43,647 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 121 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:13:43,647 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [557971894] [2020-12-09 07:13:43,648 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2020-12-09 07:13:43,648 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 07:13:43,648 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 07:13:43,648 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 07:13:43,648 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 07:13:43,726 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 07:13:43,907 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 07:13:44,206 WARN L197 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 92 DAG size of output: 58 [2020-12-09 07:13:45,130 WARN L197 SmtUtils]: Spent 410.00 ms on a formula simplification. DAG size of input: 87 DAG size of output: 73 [2020-12-09 07:13:45,826 WARN L197 SmtUtils]: Spent 507.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 82 [2020-12-09 07:13:46,541 WARN L197 SmtUtils]: Spent 461.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 78 [2020-12-09 07:13:46,744 WARN L197 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 46 [2020-12-09 07:13:46,746 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 07:13:46,746 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 07:13:46,746 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 25, 25] total 73 [2020-12-09 07:13:46,746 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1198759160] [2020-12-09 07:13:46,747 INFO L461 AbstractCegarLoop]: Interpolant automaton has 75 states [2020-12-09 07:13:46,747 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 07:13:46,747 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2020-12-09 07:13:46,747 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=739, Invalid=6067, Unknown=0, NotChecked=0, Total=6806 [2020-12-09 07:13:46,747 INFO L87 Difference]: Start difference. First operand 73 states and 74 transitions. Second operand 75 states. [2020-12-09 07:13:47,823 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 07:13:47,823 INFO L93 Difference]: Finished difference Result 78 states and 79 transitions. [2020-12-09 07:13:47,823 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-12-09 07:13:47,823 INFO L78 Accepts]: Start accepts. Automaton has 75 states. Word has length 72 [2020-12-09 07:13:47,824 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 07:13:47,824 INFO L225 Difference]: With dead ends: 78 [2020-12-09 07:13:47,824 INFO L226 Difference]: Without dead ends: 78 [2020-12-09 07:13:47,825 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 252 GetRequests, 156 SyntacticMatches, 1 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3076 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=1386, Invalid=7926, Unknown=0, NotChecked=0, Total=9312 [2020-12-09 07:13:47,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-12-09 07:13:47,826 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2020-12-09 07:13:47,826 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-12-09 07:13:47,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 78 transitions. [2020-12-09 07:13:47,826 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 78 transitions. Word has length 72 [2020-12-09 07:13:47,826 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 07:13:47,826 INFO L481 AbstractCegarLoop]: Abstraction has 77 states and 78 transitions. [2020-12-09 07:13:47,826 INFO L482 AbstractCegarLoop]: Interpolant automaton has 75 states. [2020-12-09 07:13:47,826 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 78 transitions. [2020-12-09 07:13:47,827 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2020-12-09 07:13:47,827 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 07:13:47,827 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 11, 11, 1, 1, 1, 1] [2020-12-09 07:13:48,027 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1132 [2020-12-09 07:13:48,028 INFO L429 AbstractCegarLoop]: === Iteration 31 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2020-12-09 07:13:48,029 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 07:13:48,029 INFO L82 PathProgramCache]: Analyzing trace with hash 1760112412, now seen corresponding path program 22 times [2020-12-09 07:13:48,029 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 07:13:48,030 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2064584199] [2020-12-09 07:13:48,030 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 07:13:48,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 07:13:48,632 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 36 proven. 385 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:13:48,633 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2064584199] [2020-12-09 07:13:48,633 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [268426571] [2020-12-09 07:13:48,633 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_30a406d9-f441-4710-a5e5-186db8501b7e/bin/utaipan/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 07:13:48,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 07:13:48,697 INFO L263 TraceCheckSpWp]: Trace formula consists of 355 conjuncts, 88 conjunts are in the unsatisfiable core [2020-12-09 07:13:48,699 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 07:13:49,277 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 36 proven. 385 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:13:49,277 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 07:13:49,789 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 36 proven. 385 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:13:49,789 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1331997955] [2020-12-09 07:13:49,789 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2020-12-09 07:13:49,790 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 07:13:49,790 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 07:13:49,790 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 07:13:49,790 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 07:13:49,853 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 07:13:50,045 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 07:13:50,337 WARN L197 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 92 DAG size of output: 58 [2020-12-09 07:13:51,261 WARN L197 SmtUtils]: Spent 413.00 ms on a formula simplification. DAG size of input: 87 DAG size of output: 73 [2020-12-09 07:13:51,955 WARN L197 SmtUtils]: Spent 523.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 82 [2020-12-09 07:13:52,647 WARN L197 SmtUtils]: Spent 488.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 78 [2020-12-09 07:13:52,836 WARN L197 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 46 [2020-12-09 07:13:52,838 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 07:13:52,838 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 07:13:52,838 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 46 [2020-12-09 07:13:52,838 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1969541982] [2020-12-09 07:13:52,838 INFO L461 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-12-09 07:13:52,838 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 07:13:52,839 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-12-09 07:13:52,839 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=156, Invalid=2814, Unknown=0, NotChecked=0, Total=2970 [2020-12-09 07:13:52,839 INFO L87 Difference]: Start difference. First operand 77 states and 78 transitions. Second operand 47 states. [2020-12-09 07:13:54,686 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 07:13:54,686 INFO L93 Difference]: Finished difference Result 129 states and 130 transitions. [2020-12-09 07:13:54,687 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-12-09 07:13:54,687 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 76 [2020-12-09 07:13:54,687 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 07:13:54,687 INFO L225 Difference]: With dead ends: 129 [2020-12-09 07:13:54,687 INFO L226 Difference]: Without dead ends: 80 [2020-12-09 07:13:54,688 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 279 GetRequests, 191 SyntacticMatches, 10 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 1006 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=358, Invalid=5962, Unknown=0, NotChecked=0, Total=6320 [2020-12-09 07:13:54,688 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-12-09 07:13:54,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 79. [2020-12-09 07:13:54,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-12-09 07:13:54,689 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 80 transitions. [2020-12-09 07:13:54,689 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 80 transitions. Word has length 76 [2020-12-09 07:13:54,689 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 07:13:54,689 INFO L481 AbstractCegarLoop]: Abstraction has 79 states and 80 transitions. [2020-12-09 07:13:54,689 INFO L482 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-12-09 07:13:54,689 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 80 transitions. [2020-12-09 07:13:54,689 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-12-09 07:13:54,690 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 07:13:54,690 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 12, 12, 1, 1, 1, 1] [2020-12-09 07:13:54,890 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1178 [2020-12-09 07:13:54,891 INFO L429 AbstractCegarLoop]: === Iteration 32 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2020-12-09 07:13:54,891 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 07:13:54,892 INFO L82 PathProgramCache]: Analyzing trace with hash -558845048, now seen corresponding path program 23 times [2020-12-09 07:13:54,892 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 07:13:54,892 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1350893291] [2020-12-09 07:13:54,892 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 07:13:54,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 07:13:55,436 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 100 proven. 344 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:13:55,436 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1350893291] [2020-12-09 07:13:55,436 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [805435073] [2020-12-09 07:13:55,436 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_30a406d9-f441-4710-a5e5-186db8501b7e/bin/utaipan/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 07:13:56,202 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2020-12-09 07:13:56,203 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-09 07:13:56,206 INFO L263 TraceCheckSpWp]: Trace formula consists of 365 conjuncts, 66 conjunts are in the unsatisfiable core [2020-12-09 07:13:56,207 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 07:13:57,216 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 121 proven. 323 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:13:57,216 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 07:13:58,593 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 144 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:13:58,593 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1335544557] [2020-12-09 07:13:58,594 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2020-12-09 07:13:58,595 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 07:13:58,595 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 07:13:58,595 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 07:13:58,595 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 07:13:58,802 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 07:13:58,809 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 07:13:58,982 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 07:13:59,203 WARN L197 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 50 [2020-12-09 07:13:59,576 WARN L197 SmtUtils]: Spent 218.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 62 [2020-12-09 07:14:00,064 WARN L197 SmtUtils]: Spent 219.00 ms on a formula simplification. DAG size of input: 77 DAG size of output: 64 [2020-12-09 07:14:00,550 WARN L197 SmtUtils]: Spent 202.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 55 [2020-12-09 07:14:00,791 WARN L197 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 51 [2020-12-09 07:14:00,793 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 07:14:00,793 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 07:14:00,793 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 27, 27] total 80 [2020-12-09 07:14:00,793 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1416532991] [2020-12-09 07:14:00,793 INFO L461 AbstractCegarLoop]: Interpolant automaton has 82 states [2020-12-09 07:14:00,793 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 07:14:00,794 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 82 interpolants. [2020-12-09 07:14:00,794 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=984, Invalid=6848, Unknown=0, NotChecked=0, Total=7832 [2020-12-09 07:14:00,794 INFO L87 Difference]: Start difference. First operand 79 states and 80 transitions. Second operand 82 states. [2020-12-09 07:14:02,054 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 07:14:02,054 INFO L93 Difference]: Finished difference Result 84 states and 85 transitions. [2020-12-09 07:14:02,054 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-12-09 07:14:02,055 INFO L78 Accepts]: Start accepts. Automaton has 82 states. Word has length 78 [2020-12-09 07:14:02,055 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 07:14:02,055 INFO L225 Difference]: With dead ends: 84 [2020-12-09 07:14:02,055 INFO L226 Difference]: Without dead ends: 84 [2020-12-09 07:14:02,056 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 273 GetRequests, 171 SyntacticMatches, 0 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3417 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=1830, Invalid=8882, Unknown=0, NotChecked=0, Total=10712 [2020-12-09 07:14:02,056 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2020-12-09 07:14:02,057 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 83. [2020-12-09 07:14:02,057 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2020-12-09 07:14:02,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 84 transitions. [2020-12-09 07:14:02,057 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 84 transitions. Word has length 78 [2020-12-09 07:14:02,057 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 07:14:02,057 INFO L481 AbstractCegarLoop]: Abstraction has 83 states and 84 transitions. [2020-12-09 07:14:02,057 INFO L482 AbstractCegarLoop]: Interpolant automaton has 82 states. [2020-12-09 07:14:02,057 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 84 transitions. [2020-12-09 07:14:02,058 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-12-09 07:14:02,058 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 07:14:02,058 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 12, 12, 1, 1, 1, 1] [2020-12-09 07:14:02,258 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1224,25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 07:14:02,259 INFO L429 AbstractCegarLoop]: === Iteration 33 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2020-12-09 07:14:02,260 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 07:14:02,260 INFO L82 PathProgramCache]: Analyzing trace with hash -366313433, now seen corresponding path program 24 times [2020-12-09 07:14:02,260 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 07:14:02,261 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1530120358] [2020-12-09 07:14:02,261 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 07:14:02,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 07:14:02,909 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 39 proven. 456 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:14:02,910 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1530120358] [2020-12-09 07:14:02,910 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1629283563] [2020-12-09 07:14:02,910 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_30a406d9-f441-4710-a5e5-186db8501b7e/bin/utaipan/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 07:14:03,001 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-09 07:14:03,001 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-09 07:14:03,003 INFO L263 TraceCheckSpWp]: Trace formula consists of 381 conjuncts, 92 conjunts are in the unsatisfiable core [2020-12-09 07:14:03,005 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 07:14:03,687 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 39 proven. 456 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:14:03,687 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 07:14:04,216 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 39 proven. 456 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:14:04,216 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [246536810] [2020-12-09 07:14:04,217 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2020-12-09 07:14:04,217 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 07:14:04,217 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 07:14:04,217 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 07:14:04,217 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 07:14:04,442 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 07:14:04,484 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 07:14:04,626 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 07:14:04,812 WARN L197 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 50 [2020-12-09 07:14:05,187 WARN L197 SmtUtils]: Spent 224.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 62 [2020-12-09 07:14:05,686 WARN L197 SmtUtils]: Spent 213.00 ms on a formula simplification. DAG size of input: 77 DAG size of output: 64 [2020-12-09 07:14:05,890 WARN L197 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 46 [2020-12-09 07:14:06,183 WARN L197 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 55 [2020-12-09 07:14:06,434 WARN L197 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 51 [2020-12-09 07:14:06,435 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 07:14:06,435 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 07:14:06,435 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 49 [2020-12-09 07:14:06,435 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [641426391] [2020-12-09 07:14:06,436 INFO L461 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-12-09 07:14:06,436 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 07:14:06,436 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-12-09 07:14:06,436 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=3043, Unknown=0, NotChecked=0, Total=3192 [2020-12-09 07:14:06,436 INFO L87 Difference]: Start difference. First operand 83 states and 84 transitions. Second operand 50 states. [2020-12-09 07:14:08,586 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 07:14:08,586 INFO L93 Difference]: Finished difference Result 139 states and 140 transitions. [2020-12-09 07:14:08,587 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-12-09 07:14:08,587 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 82 [2020-12-09 07:14:08,587 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 07:14:08,587 INFO L225 Difference]: With dead ends: 139 [2020-12-09 07:14:08,587 INFO L226 Difference]: Without dead ends: 86 [2020-12-09 07:14:08,588 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 301 GetRequests, 209 SyntacticMatches, 10 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 1006 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=366, Invalid=6606, Unknown=0, NotChecked=0, Total=6972 [2020-12-09 07:14:08,588 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-12-09 07:14:08,589 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2020-12-09 07:14:08,589 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-12-09 07:14:08,590 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 86 transitions. [2020-12-09 07:14:08,590 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 86 transitions. Word has length 82 [2020-12-09 07:14:08,590 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 07:14:08,590 INFO L481 AbstractCegarLoop]: Abstraction has 85 states and 86 transitions. [2020-12-09 07:14:08,590 INFO L482 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-12-09 07:14:08,590 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 86 transitions. [2020-12-09 07:14:08,590 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2020-12-09 07:14:08,590 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 07:14:08,591 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 13, 13, 1, 1, 1, 1] [2020-12-09 07:14:08,791 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1295 [2020-12-09 07:14:08,792 INFO L429 AbstractCegarLoop]: === Iteration 34 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2020-12-09 07:14:08,792 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 07:14:08,793 INFO L82 PathProgramCache]: Analyzing trace with hash -1235221613, now seen corresponding path program 25 times [2020-12-09 07:14:08,793 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 07:14:08,793 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1222035531] [2020-12-09 07:14:08,793 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 07:14:08,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 07:14:09,379 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 121 proven. 399 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:14:09,379 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1222035531] [2020-12-09 07:14:09,379 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [615881908] [2020-12-09 07:14:09,379 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_30a406d9-f441-4710-a5e5-186db8501b7e/bin/utaipan/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 07:14:09,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 07:14:09,448 INFO L263 TraceCheckSpWp]: Trace formula consists of 391 conjuncts, 80 conjunts are in the unsatisfiable core [2020-12-09 07:14:09,449 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 07:14:09,964 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 144 proven. 376 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:14:09,964 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 07:14:10,648 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 144 proven. 376 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:14:10,649 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1330134212] [2020-12-09 07:14:10,649 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2020-12-09 07:14:10,649 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 07:14:10,649 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 07:14:10,650 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 07:14:10,650 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 07:14:10,901 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 07:14:10,910 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 07:14:11,065 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 07:14:11,244 WARN L197 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 50 [2020-12-09 07:14:11,648 WARN L197 SmtUtils]: Spent 248.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 62 [2020-12-09 07:14:12,171 WARN L197 SmtUtils]: Spent 255.00 ms on a formula simplification. DAG size of input: 77 DAG size of output: 64 [2020-12-09 07:14:12,395 WARN L197 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 46 [2020-12-09 07:14:12,771 WARN L197 SmtUtils]: Spent 214.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 55 [2020-12-09 07:14:13,044 WARN L197 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 51 [2020-12-09 07:14:13,046 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 07:14:13,046 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 07:14:13,046 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 29, 29] total 59 [2020-12-09 07:14:13,046 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [228292974] [2020-12-09 07:14:13,047 INFO L461 AbstractCegarLoop]: Interpolant automaton has 61 states [2020-12-09 07:14:13,047 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 07:14:13,047 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2020-12-09 07:14:13,047 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=508, Invalid=4048, Unknown=0, NotChecked=0, Total=4556 [2020-12-09 07:14:13,047 INFO L87 Difference]: Start difference. First operand 85 states and 86 transitions. Second operand 61 states. [2020-12-09 07:14:14,563 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 07:14:14,563 INFO L93 Difference]: Finished difference Result 90 states and 91 transitions. [2020-12-09 07:14:14,564 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-12-09 07:14:14,564 INFO L78 Accepts]: Start accepts. Automaton has 61 states. Word has length 84 [2020-12-09 07:14:14,564 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 07:14:14,564 INFO L225 Difference]: With dead ends: 90 [2020-12-09 07:14:14,564 INFO L226 Difference]: Without dead ends: 90 [2020-12-09 07:14:14,565 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 294 GetRequests, 210 SyntacticMatches, 2 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1902 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=1124, Invalid=5848, Unknown=0, NotChecked=0, Total=6972 [2020-12-09 07:14:14,565 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-12-09 07:14:14,566 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2020-12-09 07:14:14,566 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-12-09 07:14:14,566 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 90 transitions. [2020-12-09 07:14:14,566 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 90 transitions. Word has length 84 [2020-12-09 07:14:14,566 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 07:14:14,566 INFO L481 AbstractCegarLoop]: Abstraction has 89 states and 90 transitions. [2020-12-09 07:14:14,566 INFO L482 AbstractCegarLoop]: Interpolant automaton has 61 states. [2020-12-09 07:14:14,566 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 90 transitions. [2020-12-09 07:14:14,567 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2020-12-09 07:14:14,567 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 07:14:14,567 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 13, 13, 1, 1, 1, 1] [2020-12-09 07:14:14,767 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1367 [2020-12-09 07:14:14,768 INFO L429 AbstractCegarLoop]: === Iteration 35 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2020-12-09 07:14:14,769 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 07:14:14,769 INFO L82 PathProgramCache]: Analyzing trace with hash -1169370446, now seen corresponding path program 26 times [2020-12-09 07:14:14,769 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 07:14:14,770 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [742859982] [2020-12-09 07:14:14,770 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 07:14:14,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 07:14:15,558 INFO L134 CoverageAnalysis]: Checked inductivity of 575 backedges. 42 proven. 533 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:14:15,558 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [742859982] [2020-12-09 07:14:15,558 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1893950294] [2020-12-09 07:14:15,558 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_30a406d9-f441-4710-a5e5-186db8501b7e/bin/utaipan/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 07:14:16,803 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2020-12-09 07:14:16,803 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-09 07:14:16,807 INFO L263 TraceCheckSpWp]: Trace formula consists of 407 conjuncts, 100 conjunts are in the unsatisfiable core [2020-12-09 07:14:16,809 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 07:14:17,625 INFO L134 CoverageAnalysis]: Checked inductivity of 575 backedges. 42 proven. 533 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:14:17,626 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 07:14:18,246 INFO L134 CoverageAnalysis]: Checked inductivity of 575 backedges. 42 proven. 533 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:14:18,247 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2099873580] [2020-12-09 07:14:18,247 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2020-12-09 07:14:18,248 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 07:14:18,248 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 07:14:18,248 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 07:14:18,248 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 07:14:18,334 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 07:14:18,559 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 07:14:18,884 WARN L197 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 92 DAG size of output: 58 [2020-12-09 07:14:19,962 WARN L197 SmtUtils]: Spent 457.00 ms on a formula simplification. DAG size of input: 87 DAG size of output: 73 [2020-12-09 07:14:20,897 WARN L197 SmtUtils]: Spent 667.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 82 [2020-12-09 07:14:21,644 WARN L197 SmtUtils]: Spent 514.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 78 [2020-12-09 07:14:21,891 WARN L197 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 46 [2020-12-09 07:14:21,893 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 07:14:21,893 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 07:14:21,893 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 52 [2020-12-09 07:14:21,893 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [461260917] [2020-12-09 07:14:21,893 INFO L461 AbstractCegarLoop]: Interpolant automaton has 53 states [2020-12-09 07:14:21,893 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 07:14:21,894 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2020-12-09 07:14:21,894 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=3490, Unknown=0, NotChecked=0, Total=3660 [2020-12-09 07:14:21,894 INFO L87 Difference]: Start difference. First operand 89 states and 90 transitions. Second operand 53 states. [2020-12-09 07:14:24,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 07:14:24,348 INFO L93 Difference]: Finished difference Result 149 states and 150 transitions. [2020-12-09 07:14:24,349 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-12-09 07:14:24,349 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 88 [2020-12-09 07:14:24,349 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 07:14:24,350 INFO L225 Difference]: With dead ends: 149 [2020-12-09 07:14:24,350 INFO L226 Difference]: Without dead ends: 92 [2020-12-09 07:14:24,350 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 323 GetRequests, 224 SyntacticMatches, 11 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 1238 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=402, Invalid=7608, Unknown=0, NotChecked=0, Total=8010 [2020-12-09 07:14:24,350 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2020-12-09 07:14:24,351 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 91. [2020-12-09 07:14:24,351 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-12-09 07:14:24,351 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 92 transitions. [2020-12-09 07:14:24,351 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 92 transitions. Word has length 88 [2020-12-09 07:14:24,352 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 07:14:24,352 INFO L481 AbstractCegarLoop]: Abstraction has 91 states and 92 transitions. [2020-12-09 07:14:24,352 INFO L482 AbstractCegarLoop]: Interpolant automaton has 53 states. [2020-12-09 07:14:24,352 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 92 transitions. [2020-12-09 07:14:24,352 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2020-12-09 07:14:24,352 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 07:14:24,352 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 14, 14, 1, 1, 1, 1] [2020-12-09 07:14:24,553 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1439 [2020-12-09 07:14:24,553 INFO L429 AbstractCegarLoop]: === Iteration 36 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2020-12-09 07:14:24,554 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 07:14:24,554 INFO L82 PathProgramCache]: Analyzing trace with hash -332065506, now seen corresponding path program 27 times [2020-12-09 07:14:24,554 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 07:14:24,555 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1813186601] [2020-12-09 07:14:24,555 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 07:14:24,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 07:14:25,306 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 144 proven. 458 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:14:25,306 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1813186601] [2020-12-09 07:14:25,307 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [40244350] [2020-12-09 07:14:25,307 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_30a406d9-f441-4710-a5e5-186db8501b7e/bin/utaipan/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 07:14:25,426 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-09 07:14:25,426 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-09 07:14:25,429 INFO L263 TraceCheckSpWp]: Trace formula consists of 417 conjuncts, 87 conjunts are in the unsatisfiable core [2020-12-09 07:14:25,430 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 07:14:26,685 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 169 proven. 433 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:14:26,685 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 07:14:28,542 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 196 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:14:28,542 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [145886884] [2020-12-09 07:14:28,543 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2020-12-09 07:14:28,543 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 07:14:28,543 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 07:14:28,543 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 07:14:28,543 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 07:14:28,845 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 07:14:29,217 WARN L197 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 92 DAG size of output: 58 [2020-12-09 07:14:30,474 WARN L197 SmtUtils]: Spent 511.00 ms on a formula simplification. DAG size of input: 87 DAG size of output: 73 [2020-12-09 07:14:31,415 WARN L197 SmtUtils]: Spent 605.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 82 [2020-12-09 07:14:32,275 WARN L197 SmtUtils]: Spent 544.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 78 [2020-12-09 07:14:32,536 WARN L197 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 46 [2020-12-09 07:14:32,538 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 07:14:32,539 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 07:14:32,539 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 31, 31] total 91 [2020-12-09 07:14:32,539 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2073977610] [2020-12-09 07:14:32,539 INFO L461 AbstractCegarLoop]: Interpolant automaton has 93 states [2020-12-09 07:14:32,539 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 07:14:32,539 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 93 interpolants. [2020-12-09 07:14:32,540 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1093, Invalid=9007, Unknown=0, NotChecked=0, Total=10100 [2020-12-09 07:14:32,540 INFO L87 Difference]: Start difference. First operand 91 states and 92 transitions. Second operand 93 states. [2020-12-09 07:14:34,533 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 07:14:34,533 INFO L93 Difference]: Finished difference Result 96 states and 97 transitions. [2020-12-09 07:14:34,534 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-12-09 07:14:34,534 INFO L78 Accepts]: Start accepts. Automaton has 93 states. Word has length 90 [2020-12-09 07:14:34,534 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 07:14:34,535 INFO L225 Difference]: With dead ends: 96 [2020-12-09 07:14:34,535 INFO L226 Difference]: Without dead ends: 96 [2020-12-09 07:14:34,535 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 315 GetRequests, 198 SyntacticMatches, 1 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4684 ImplicationChecksByTransitivity, 7.7s TimeCoverageRelationStatistics Valid=2058, Invalid=11748, Unknown=0, NotChecked=0, Total=13806 [2020-12-09 07:14:34,535 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-12-09 07:14:34,536 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2020-12-09 07:14:34,536 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2020-12-09 07:14:34,537 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 96 transitions. [2020-12-09 07:14:34,537 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 96 transitions. Word has length 90 [2020-12-09 07:14:34,537 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 07:14:34,537 INFO L481 AbstractCegarLoop]: Abstraction has 95 states and 96 transitions. [2020-12-09 07:14:34,537 INFO L482 AbstractCegarLoop]: Interpolant automaton has 93 states. [2020-12-09 07:14:34,537 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 96 transitions. [2020-12-09 07:14:34,537 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2020-12-09 07:14:34,537 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 07:14:34,537 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 14, 14, 1, 1, 1, 1] [2020-12-09 07:14:34,738 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1493,29 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 07:14:34,739 INFO L429 AbstractCegarLoop]: === Iteration 37 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2020-12-09 07:14:34,739 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 07:14:34,739 INFO L82 PathProgramCache]: Analyzing trace with hash -187160899, now seen corresponding path program 28 times [2020-12-09 07:14:34,740 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 07:14:34,740 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [904169122] [2020-12-09 07:14:34,740 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 07:14:34,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 07:14:35,668 INFO L134 CoverageAnalysis]: Checked inductivity of 661 backedges. 45 proven. 616 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:14:35,668 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [904169122] [2020-12-09 07:14:35,668 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1348887430] [2020-12-09 07:14:35,668 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_30a406d9-f441-4710-a5e5-186db8501b7e/bin/utaipan/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 07:14:35,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 07:14:35,743 INFO L263 TraceCheckSpWp]: Trace formula consists of 433 conjuncts, 106 conjunts are in the unsatisfiable core [2020-12-09 07:14:35,745 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 07:14:36,685 INFO L134 CoverageAnalysis]: Checked inductivity of 661 backedges. 45 proven. 616 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:14:36,685 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 07:14:37,421 INFO L134 CoverageAnalysis]: Checked inductivity of 661 backedges. 45 proven. 616 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:14:37,421 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [57317358] [2020-12-09 07:14:37,422 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2020-12-09 07:14:37,422 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 07:14:37,422 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 07:14:37,422 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 07:14:37,423 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 07:14:37,645 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 07:14:37,656 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 07:14:37,855 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 07:14:38,117 WARN L197 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 50 [2020-12-09 07:14:38,650 WARN L197 SmtUtils]: Spent 306.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 62 [2020-12-09 07:14:39,331 WARN L197 SmtUtils]: Spent 280.00 ms on a formula simplification. DAG size of input: 77 DAG size of output: 64 [2020-12-09 07:14:39,564 WARN L197 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 46 [2020-12-09 07:14:39,914 WARN L197 SmtUtils]: Spent 194.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 55 [2020-12-09 07:14:40,220 WARN L197 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 51 [2020-12-09 07:14:40,222 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 07:14:40,222 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 07:14:40,222 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 55 [2020-12-09 07:14:40,222 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1467987070] [2020-12-09 07:14:40,222 INFO L461 AbstractCegarLoop]: Interpolant automaton has 56 states [2020-12-09 07:14:40,222 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 07:14:40,222 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2020-12-09 07:14:40,223 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=3743, Unknown=0, NotChecked=0, Total=3906 [2020-12-09 07:14:40,223 INFO L87 Difference]: Start difference. First operand 95 states and 96 transitions. Second operand 56 states. [2020-12-09 07:14:43,331 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 07:14:43,331 INFO L93 Difference]: Finished difference Result 159 states and 160 transitions. [2020-12-09 07:14:43,332 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2020-12-09 07:14:43,332 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 94 [2020-12-09 07:14:43,332 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 07:14:43,332 INFO L225 Difference]: With dead ends: 159 [2020-12-09 07:14:43,332 INFO L226 Difference]: Without dead ends: 98 [2020-12-09 07:14:43,333 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 345 GetRequests, 242 SyntacticMatches, 11 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 1235 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=410, Invalid=8332, Unknown=0, NotChecked=0, Total=8742 [2020-12-09 07:14:43,333 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-12-09 07:14:43,334 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 97. [2020-12-09 07:14:43,334 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2020-12-09 07:14:43,334 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 98 transitions. [2020-12-09 07:14:43,334 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 98 transitions. Word has length 94 [2020-12-09 07:14:43,334 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 07:14:43,335 INFO L481 AbstractCegarLoop]: Abstraction has 97 states and 98 transitions. [2020-12-09 07:14:43,335 INFO L482 AbstractCegarLoop]: Interpolant automaton has 56 states. [2020-12-09 07:14:43,335 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 98 transitions. [2020-12-09 07:14:43,335 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-12-09 07:14:43,335 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 07:14:43,335 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 15, 15, 1, 1, 1, 1] [2020-12-09 07:14:43,536 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1540 [2020-12-09 07:14:43,536 INFO L429 AbstractCegarLoop]: === Iteration 38 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2020-12-09 07:14:43,537 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 07:14:43,537 INFO L82 PathProgramCache]: Analyzing trace with hash -987240407, now seen corresponding path program 29 times [2020-12-09 07:14:43,537 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 07:14:43,538 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [881934062] [2020-12-09 07:14:43,538 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 07:14:43,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 07:14:44,420 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 169 proven. 521 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:14:44,421 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [881934062] [2020-12-09 07:14:44,421 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [913717049] [2020-12-09 07:14:44,421 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_30a406d9-f441-4710-a5e5-186db8501b7e/bin/utaipan/z3 Starting monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 07:14:45,474 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2020-12-09 07:14:45,474 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-09 07:14:45,478 INFO L263 TraceCheckSpWp]: Trace formula consists of 443 conjuncts, 78 conjunts are in the unsatisfiable core [2020-12-09 07:14:45,480 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 07:14:47,345 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 196 proven. 494 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:14:47,346 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 07:14:49,895 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 225 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:14:49,895 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1327496765] [2020-12-09 07:14:49,896 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2020-12-09 07:14:49,896 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 07:14:49,896 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 07:14:49,896 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 07:14:49,896 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 07:14:50,007 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 07:14:50,217 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 07:14:50,618 WARN L197 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 92 DAG size of output: 58 [2020-12-09 07:14:51,881 WARN L197 SmtUtils]: Spent 547.00 ms on a formula simplification. DAG size of input: 87 DAG size of output: 73 [2020-12-09 07:14:52,805 WARN L197 SmtUtils]: Spent 611.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 82 [2020-12-09 07:14:53,719 WARN L197 SmtUtils]: Spent 584.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 78 [2020-12-09 07:14:53,973 WARN L197 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 46 [2020-12-09 07:14:53,976 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 07:14:53,976 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 07:14:53,976 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 33, 33] total 98 [2020-12-09 07:14:53,976 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [572135587] [2020-12-09 07:14:53,976 INFO L461 AbstractCegarLoop]: Interpolant automaton has 100 states [2020-12-09 07:14:53,977 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 07:14:53,977 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 100 interpolants. [2020-12-09 07:14:53,977 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1457, Invalid=10099, Unknown=0, NotChecked=0, Total=11556 [2020-12-09 07:14:53,977 INFO L87 Difference]: Start difference. First operand 97 states and 98 transitions. Second operand 100 states. [2020-12-09 07:14:56,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 07:14:56,753 INFO L93 Difference]: Finished difference Result 102 states and 103 transitions. [2020-12-09 07:14:56,754 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-12-09 07:14:56,754 INFO L78 Accepts]: Start accepts. Automaton has 100 states. Word has length 96 [2020-12-09 07:14:56,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 07:14:56,755 INFO L225 Difference]: With dead ends: 102 [2020-12-09 07:14:56,755 INFO L226 Difference]: Without dead ends: 102 [2020-12-09 07:14:56,755 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 336 GetRequests, 212 SyntacticMatches, 0 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5221 ImplicationChecksByTransitivity, 9.5s TimeCoverageRelationStatistics Valid=2690, Invalid=13060, Unknown=0, NotChecked=0, Total=15750 [2020-12-09 07:14:56,755 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2020-12-09 07:14:56,756 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 101. [2020-12-09 07:14:56,756 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2020-12-09 07:14:56,757 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 102 transitions. [2020-12-09 07:14:56,757 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 102 transitions. Word has length 96 [2020-12-09 07:14:56,757 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 07:14:56,757 INFO L481 AbstractCegarLoop]: Abstraction has 101 states and 102 transitions. [2020-12-09 07:14:56,757 INFO L482 AbstractCegarLoop]: Interpolant automaton has 100 states. [2020-12-09 07:14:56,757 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 102 transitions. [2020-12-09 07:14:56,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2020-12-09 07:14:56,757 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 07:14:56,757 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 16, 16, 15, 15, 1, 1, 1, 1] [2020-12-09 07:14:56,958 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1612,31 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 07:14:56,959 INFO L429 AbstractCegarLoop]: === Iteration 39 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2020-12-09 07:14:56,959 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 07:14:56,960 INFO L82 PathProgramCache]: Analyzing trace with hash -1564181432, now seen corresponding path program 30 times [2020-12-09 07:14:56,960 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 07:14:56,960 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1695358631] [2020-12-09 07:14:56,960 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 07:14:57,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 07:14:58,087 INFO L134 CoverageAnalysis]: Checked inductivity of 753 backedges. 48 proven. 705 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:14:58,087 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1695358631] [2020-12-09 07:14:58,087 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [284997382] [2020-12-09 07:14:58,087 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_30a406d9-f441-4710-a5e5-186db8501b7e/bin/utaipan/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 07:14:58,364 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-09 07:14:58,365 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-09 07:14:58,368 INFO L263 TraceCheckSpWp]: Trace formula consists of 459 conjuncts, 110 conjunts are in the unsatisfiable core [2020-12-09 07:14:58,369 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 07:14:59,555 INFO L134 CoverageAnalysis]: Checked inductivity of 753 backedges. 48 proven. 705 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:14:59,555 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 07:15:00,520 INFO L134 CoverageAnalysis]: Checked inductivity of 753 backedges. 48 proven. 705 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:15:00,520 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [125805900] [2020-12-09 07:15:00,520 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2020-12-09 07:15:00,521 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 07:15:00,521 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 07:15:00,521 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 07:15:00,521 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 07:15:00,764 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 07:15:00,785 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 07:15:00,968 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 07:15:01,248 WARN L197 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 50 [2020-12-09 07:15:01,717 WARN L197 SmtUtils]: Spent 258.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 62 [2020-12-09 07:15:02,411 WARN L197 SmtUtils]: Spent 284.00 ms on a formula simplification. DAG size of input: 77 DAG size of output: 64 [2020-12-09 07:15:02,686 WARN L197 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 46 [2020-12-09 07:15:03,093 WARN L197 SmtUtils]: Spent 220.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 55 [2020-12-09 07:15:03,440 WARN L197 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 51 [2020-12-09 07:15:03,442 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 07:15:03,442 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 07:15:03,443 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 58 [2020-12-09 07:15:03,443 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [314325550] [2020-12-09 07:15:03,443 INFO L461 AbstractCegarLoop]: Interpolant automaton has 59 states [2020-12-09 07:15:03,443 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 07:15:03,443 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2020-12-09 07:15:03,443 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=4120, Unknown=0, NotChecked=0, Total=4290 [2020-12-09 07:15:03,444 INFO L87 Difference]: Start difference. First operand 101 states and 102 transitions. Second operand 59 states. [2020-12-09 07:15:08,161 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 07:15:08,161 INFO L93 Difference]: Finished difference Result 169 states and 170 transitions. [2020-12-09 07:15:08,162 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2020-12-09 07:15:08,162 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 100 [2020-12-09 07:15:08,162 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 07:15:08,163 INFO L225 Difference]: With dead ends: 169 [2020-12-09 07:15:08,163 INFO L226 Difference]: Without dead ends: 104 [2020-12-09 07:15:08,163 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 367 GetRequests, 258 SyntacticMatches, 12 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 1369 ImplicationChecksByTransitivity, 7.5s TimeCoverageRelationStatistics Valid=432, Invalid=9270, Unknown=0, NotChecked=0, Total=9702 [2020-12-09 07:15:08,163 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2020-12-09 07:15:08,166 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 103. [2020-12-09 07:15:08,166 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-12-09 07:15:08,166 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 104 transitions. [2020-12-09 07:15:08,166 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 104 transitions. Word has length 100 [2020-12-09 07:15:08,166 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 07:15:08,166 INFO L481 AbstractCegarLoop]: Abstraction has 103 states and 104 transitions. [2020-12-09 07:15:08,166 INFO L482 AbstractCegarLoop]: Interpolant automaton has 59 states. [2020-12-09 07:15:08,166 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 104 transitions. [2020-12-09 07:15:08,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2020-12-09 07:15:08,167 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 07:15:08,167 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 16, 16, 16, 16, 1, 1, 1, 1] [2020-12-09 07:15:08,367 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1661 [2020-12-09 07:15:08,367 INFO L429 AbstractCegarLoop]: === Iteration 40 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2020-12-09 07:15:08,367 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 07:15:08,367 INFO L82 PathProgramCache]: Analyzing trace with hash -1616872268, now seen corresponding path program 31 times [2020-12-09 07:15:08,368 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 07:15:08,368 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [226844286] [2020-12-09 07:15:08,368 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 07:15:08,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 07:15:09,423 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 196 proven. 588 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:15:09,423 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [226844286] [2020-12-09 07:15:09,423 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1656973386] [2020-12-09 07:15:09,423 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_30a406d9-f441-4710-a5e5-186db8501b7e/bin/utaipan/z3 Starting monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 07:15:09,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 07:15:09,499 INFO L263 TraceCheckSpWp]: Trace formula consists of 469 conjuncts, 95 conjunts are in the unsatisfiable core [2020-12-09 07:15:09,500 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 07:15:10,445 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 225 proven. 559 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:15:10,445 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 07:15:12,103 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 225 proven. 559 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:15:12,103 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [602377458] [2020-12-09 07:15:12,104 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2020-12-09 07:15:12,104 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 07:15:12,104 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 07:15:12,104 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 07:15:12,105 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 07:15:12,382 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 07:15:12,393 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 07:15:12,585 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 07:15:12,860 WARN L197 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 50 [2020-12-09 07:15:13,406 WARN L197 SmtUtils]: Spent 337.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 62 [2020-12-09 07:15:14,083 WARN L197 SmtUtils]: Spent 283.00 ms on a formula simplification. DAG size of input: 77 DAG size of output: 64 [2020-12-09 07:15:14,317 WARN L197 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 46 [2020-12-09 07:15:14,794 WARN L197 SmtUtils]: Spent 266.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 55 [2020-12-09 07:15:15,133 WARN L197 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 51 [2020-12-09 07:15:15,135 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 07:15:15,135 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 07:15:15,136 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 35, 35] total 71 [2020-12-09 07:15:15,136 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1316136292] [2020-12-09 07:15:15,136 INFO L461 AbstractCegarLoop]: Interpolant automaton has 73 states [2020-12-09 07:15:15,136 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 07:15:15,136 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2020-12-09 07:15:15,137 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=709, Invalid=5611, Unknown=0, NotChecked=0, Total=6320 [2020-12-09 07:15:15,137 INFO L87 Difference]: Start difference. First operand 103 states and 104 transitions. Second operand 73 states. [2020-12-09 07:15:18,786 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 07:15:18,786 INFO L93 Difference]: Finished difference Result 108 states and 109 transitions. [2020-12-09 07:15:18,787 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-12-09 07:15:18,787 INFO L78 Accepts]: Start accepts. Automaton has 73 states. Word has length 102 [2020-12-09 07:15:18,787 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 07:15:18,788 INFO L225 Difference]: With dead ends: 108 [2020-12-09 07:15:18,788 INFO L226 Difference]: Without dead ends: 108 [2020-12-09 07:15:18,788 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 357 GetRequests, 258 SyntacticMatches, 2 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2670 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=1583, Invalid=8119, Unknown=0, NotChecked=0, Total=9702 [2020-12-09 07:15:18,788 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-12-09 07:15:18,789 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 107. [2020-12-09 07:15:18,790 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-12-09 07:15:18,790 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 108 transitions. [2020-12-09 07:15:18,790 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 108 transitions. Word has length 102 [2020-12-09 07:15:18,790 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 07:15:18,790 INFO L481 AbstractCegarLoop]: Abstraction has 107 states and 108 transitions. [2020-12-09 07:15:18,790 INFO L482 AbstractCegarLoop]: Interpolant automaton has 73 states. [2020-12-09 07:15:18,790 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 108 transitions. [2020-12-09 07:15:18,790 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2020-12-09 07:15:18,790 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 07:15:18,791 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 17, 17, 16, 16, 1, 1, 1, 1] [2020-12-09 07:15:18,991 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1733 [2020-12-09 07:15:18,992 INFO L429 AbstractCegarLoop]: === Iteration 41 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2020-12-09 07:15:18,992 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 07:15:18,993 INFO L82 PathProgramCache]: Analyzing trace with hash -1367747757, now seen corresponding path program 32 times [2020-12-09 07:15:18,993 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 07:15:18,993 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [364983060] [2020-12-09 07:15:18,993 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 07:15:19,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 07:15:20,256 INFO L134 CoverageAnalysis]: Checked inductivity of 851 backedges. 51 proven. 800 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:15:20,256 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [364983060] [2020-12-09 07:15:20,256 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1367922470] [2020-12-09 07:15:20,256 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_30a406d9-f441-4710-a5e5-186db8501b7e/bin/utaipan/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 07:15:22,468 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2020-12-09 07:15:22,468 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-09 07:15:22,473 INFO L263 TraceCheckSpWp]: Trace formula consists of 485 conjuncts, 118 conjunts are in the unsatisfiable core [2020-12-09 07:15:22,475 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 07:15:23,855 INFO L134 CoverageAnalysis]: Checked inductivity of 851 backedges. 51 proven. 800 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:15:23,855 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 07:15:25,141 INFO L134 CoverageAnalysis]: Checked inductivity of 851 backedges. 51 proven. 800 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:15:25,141 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [187926683] [2020-12-09 07:15:25,141 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2020-12-09 07:15:25,142 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 07:15:25,142 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 07:15:25,142 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 07:15:25,142 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 07:15:25,387 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 07:15:25,408 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 07:15:25,603 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 07:15:25,913 WARN L197 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 50 [2020-12-09 07:15:26,456 WARN L197 SmtUtils]: Spent 299.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 62 [2020-12-09 07:15:27,173 WARN L197 SmtUtils]: Spent 279.00 ms on a formula simplification. DAG size of input: 77 DAG size of output: 64 [2020-12-09 07:15:27,435 WARN L197 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 46 [2020-12-09 07:15:27,850 WARN L197 SmtUtils]: Spent 232.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 55 [2020-12-09 07:15:28,200 WARN L197 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 51 [2020-12-09 07:15:28,202 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 07:15:28,202 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 07:15:28,202 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 61 [2020-12-09 07:15:28,203 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1962170776] [2020-12-09 07:15:28,203 INFO L461 AbstractCegarLoop]: Interpolant automaton has 62 states [2020-12-09 07:15:28,203 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 07:15:28,203 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2020-12-09 07:15:28,203 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=4515, Unknown=0, NotChecked=0, Total=4692 [2020-12-09 07:15:28,203 INFO L87 Difference]: Start difference. First operand 107 states and 108 transitions. Second operand 62 states. [2020-12-09 07:15:35,431 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 07:15:35,431 INFO L93 Difference]: Finished difference Result 179 states and 180 transitions. [2020-12-09 07:15:35,433 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2020-12-09 07:15:35,433 INFO L78 Accepts]: Start accepts. Automaton has 62 states. Word has length 106 [2020-12-09 07:15:35,433 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 07:15:35,433 INFO L225 Difference]: With dead ends: 179 [2020-12-09 07:15:35,434 INFO L226 Difference]: Without dead ends: 110 [2020-12-09 07:15:35,434 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 389 GetRequests, 274 SyntacticMatches, 13 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 1510 ImplicationChecksByTransitivity, 9.4s TimeCoverageRelationStatistics Valid=454, Invalid=10258, Unknown=0, NotChecked=0, Total=10712 [2020-12-09 07:15:35,435 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2020-12-09 07:15:35,436 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 109. [2020-12-09 07:15:35,436 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 109 states. [2020-12-09 07:15:35,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 110 transitions. [2020-12-09 07:15:35,437 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 110 transitions. Word has length 106 [2020-12-09 07:15:35,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 07:15:35,437 INFO L481 AbstractCegarLoop]: Abstraction has 109 states and 110 transitions. [2020-12-09 07:15:35,437 INFO L482 AbstractCegarLoop]: Interpolant automaton has 62 states. [2020-12-09 07:15:35,437 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 110 transitions. [2020-12-09 07:15:35,437 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2020-12-09 07:15:35,437 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 07:15:35,438 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 17, 17, 17, 17, 1, 1, 1, 1] [2020-12-09 07:15:35,638 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1805,34 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 07:15:35,639 INFO L429 AbstractCegarLoop]: === Iteration 42 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2020-12-09 07:15:35,640 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 07:15:35,640 INFO L82 PathProgramCache]: Analyzing trace with hash -411643201, now seen corresponding path program 33 times [2020-12-09 07:15:35,640 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 07:15:35,640 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2003463396] [2020-12-09 07:15:35,641 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 07:15:35,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 07:15:37,013 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 225 proven. 659 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:15:37,013 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2003463396] [2020-12-09 07:15:37,013 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1966278273] [2020-12-09 07:15:37,013 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_30a406d9-f441-4710-a5e5-186db8501b7e/bin/utaipan/z3 Starting monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 07:15:37,445 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-09 07:15:37,445 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-09 07:15:37,449 INFO L263 TraceCheckSpWp]: Trace formula consists of 495 conjuncts, 106 conjunts are in the unsatisfiable core [2020-12-09 07:15:37,450 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 07:15:38,933 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 256 proven. 628 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:15:38,933 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 07:15:42,929 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 289 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:15:42,930 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1530550145] [2020-12-09 07:15:42,930 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2020-12-09 07:15:42,930 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 07:15:42,931 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 07:15:42,931 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 07:15:42,931 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 07:15:43,065 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 07:15:43,296 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 07:15:43,808 WARN L197 SmtUtils]: Spent 231.00 ms on a formula simplification. DAG size of input: 92 DAG size of output: 58 [2020-12-09 07:15:45,597 WARN L197 SmtUtils]: Spent 713.00 ms on a formula simplification. DAG size of input: 87 DAG size of output: 73 [2020-12-09 07:15:46,999 WARN L197 SmtUtils]: Spent 1.02 s on a formula simplification. DAG size of input: 96 DAG size of output: 82 [2020-12-09 07:15:48,338 WARN L197 SmtUtils]: Spent 888.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 78 [2020-12-09 07:15:48,663 WARN L197 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 46 [2020-12-09 07:15:48,665 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 07:15:48,666 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 07:15:48,666 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 91 [2020-12-09 07:15:48,666 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1620178654] [2020-12-09 07:15:48,666 INFO L461 AbstractCegarLoop]: Interpolant automaton has 93 states [2020-12-09 07:15:48,666 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 07:15:48,666 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 93 interpolants. [2020-12-09 07:15:48,667 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1055, Invalid=9045, Unknown=0, NotChecked=0, Total=10100 [2020-12-09 07:15:48,667 INFO L87 Difference]: Start difference. First operand 109 states and 110 transitions. Second operand 93 states. [2020-12-09 07:15:52,804 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 07:15:52,804 INFO L93 Difference]: Finished difference Result 114 states and 115 transitions. [2020-12-09 07:15:52,805 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-12-09 07:15:52,806 INFO L78 Accepts]: Start accepts. Automaton has 93 states. Word has length 108 [2020-12-09 07:15:52,806 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 07:15:52,806 INFO L225 Difference]: With dead ends: 114 [2020-12-09 07:15:52,806 INFO L226 Difference]: Without dead ends: 114 [2020-12-09 07:15:52,807 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 378 GetRequests, 258 SyntacticMatches, 1 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3943 ImplicationChecksByTransitivity, 12.7s TimeCoverageRelationStatistics Valid=2079, Invalid=12441, Unknown=0, NotChecked=0, Total=14520 [2020-12-09 07:15:52,807 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2020-12-09 07:15:52,809 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 113. [2020-12-09 07:15:52,809 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 113 states. [2020-12-09 07:15:52,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 114 transitions. [2020-12-09 07:15:52,809 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 114 transitions. Word has length 108 [2020-12-09 07:15:52,810 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 07:15:52,810 INFO L481 AbstractCegarLoop]: Abstraction has 113 states and 114 transitions. [2020-12-09 07:15:52,810 INFO L482 AbstractCegarLoop]: Interpolant automaton has 93 states. [2020-12-09 07:15:52,810 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 114 transitions. [2020-12-09 07:15:52,810 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2020-12-09 07:15:52,810 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 07:15:52,811 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 18, 18, 17, 17, 1, 1, 1, 1] [2020-12-09 07:15:53,011 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1876 [2020-12-09 07:15:53,012 INFO L429 AbstractCegarLoop]: === Iteration 43 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2020-12-09 07:15:53,012 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 07:15:53,013 INFO L82 PathProgramCache]: Analyzing trace with hash -674223138, now seen corresponding path program 34 times [2020-12-09 07:15:53,013 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 07:15:53,013 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [205684218] [2020-12-09 07:15:53,014 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 07:15:53,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 07:15:54,659 INFO L134 CoverageAnalysis]: Checked inductivity of 955 backedges. 54 proven. 901 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:15:54,660 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [205684218] [2020-12-09 07:15:54,660 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1723164366] [2020-12-09 07:15:54,660 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_30a406d9-f441-4710-a5e5-186db8501b7e/bin/utaipan/z3 Starting monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 07:15:54,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 07:15:54,748 INFO L263 TraceCheckSpWp]: Trace formula consists of 511 conjuncts, 124 conjunts are in the unsatisfiable core [2020-12-09 07:15:54,749 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 07:15:56,688 INFO L134 CoverageAnalysis]: Checked inductivity of 955 backedges. 54 proven. 901 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:15:56,688 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 07:15:58,048 INFO L134 CoverageAnalysis]: Checked inductivity of 955 backedges. 54 proven. 901 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:15:58,048 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1472571667] [2020-12-09 07:15:58,049 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2020-12-09 07:15:58,049 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 07:15:58,049 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 07:15:58,049 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 07:15:58,050 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 07:15:58,197 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 07:15:58,416 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 07:15:58,959 WARN L197 SmtUtils]: Spent 240.00 ms on a formula simplification. DAG size of input: 92 DAG size of output: 57 [2020-12-09 07:15:59,417 WARN L197 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 33 [2020-12-09 07:16:00,766 WARN L197 SmtUtils]: Spent 769.00 ms on a formula simplification. DAG size of input: 87 DAG size of output: 72 [2020-12-09 07:16:02,121 WARN L197 SmtUtils]: Spent 972.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 81 [2020-12-09 07:16:03,463 WARN L197 SmtUtils]: Spent 925.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 77 [2020-12-09 07:16:03,841 WARN L197 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 46 [2020-12-09 07:16:03,844 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 07:16:03,844 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 07:16:03,844 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 64 [2020-12-09 07:16:03,844 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1061570358] [2020-12-09 07:16:03,844 INFO L461 AbstractCegarLoop]: Interpolant automaton has 65 states [2020-12-09 07:16:03,844 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 07:16:03,845 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2020-12-09 07:16:03,845 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=198, Invalid=5058, Unknown=0, NotChecked=0, Total=5256 [2020-12-09 07:16:03,845 INFO L87 Difference]: Start difference. First operand 113 states and 114 transitions. Second operand 65 states. [2020-12-09 07:16:12,333 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 07:16:12,333 INFO L93 Difference]: Finished difference Result 189 states and 190 transitions. [2020-12-09 07:16:12,335 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2020-12-09 07:16:12,335 INFO L78 Accepts]: Start accepts. Automaton has 65 states. Word has length 112 [2020-12-09 07:16:12,335 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 07:16:12,336 INFO L225 Difference]: With dead ends: 189 [2020-12-09 07:16:12,336 INFO L226 Difference]: Without dead ends: 116 [2020-12-09 07:16:12,336 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 411 GetRequests, 289 SyntacticMatches, 14 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 1797 ImplicationChecksByTransitivity, 13.8s TimeCoverageRelationStatistics Valid=490, Invalid=11500, Unknown=0, NotChecked=0, Total=11990 [2020-12-09 07:16:12,337 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2020-12-09 07:16:12,338 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 115. [2020-12-09 07:16:12,338 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2020-12-09 07:16:12,338 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 116 transitions. [2020-12-09 07:16:12,338 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 116 transitions. Word has length 112 [2020-12-09 07:16:12,338 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 07:16:12,339 INFO L481 AbstractCegarLoop]: Abstraction has 115 states and 116 transitions. [2020-12-09 07:16:12,339 INFO L482 AbstractCegarLoop]: Interpolant automaton has 65 states. [2020-12-09 07:16:12,339 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 116 transitions. [2020-12-09 07:16:12,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2020-12-09 07:16:12,339 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 07:16:12,339 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 18, 18, 18, 18, 1, 1, 1, 1] [2020-12-09 07:16:12,539 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1926,36 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 07:16:12,540 INFO L429 AbstractCegarLoop]: === Iteration 44 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2020-12-09 07:16:12,540 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 07:16:12,540 INFO L82 PathProgramCache]: Analyzing trace with hash 166914634, now seen corresponding path program 35 times [2020-12-09 07:16:12,540 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 07:16:12,540 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [267722096] [2020-12-09 07:16:12,540 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 07:16:12,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 07:16:14,104 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 256 proven. 734 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 07:16:14,104 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [267722096] [2020-12-09 07:16:14,104 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [754318126] [2020-12-09 07:16:14,104 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_30a406d9-f441-4710-a5e5-186db8501b7e/bin/utaipan/z3 Starting monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 07:16:17,915 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 19 check-sat command(s) [2020-12-09 07:16:17,915 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-09 07:16:17,921 INFO L263 TraceCheckSpWp]: Trace formula consists of 521 conjuncts, 59 conjunts are in the unsatisfiable core [2020-12-09 07:16:17,923 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 07:16:18,631 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 71 refuted. 0 times theorem prover too weak. 919 trivial. 0 not checked. [2020-12-09 07:16:18,631 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 07:16:19,644 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 71 refuted. 0 times theorem prover too weak. 919 trivial. 0 not checked. [2020-12-09 07:16:19,645 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [933759226] [2020-12-09 07:16:19,645 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2020-12-09 07:16:19,645 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 07:16:19,645 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 07:16:19,646 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 07:16:19,646 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 07:16:19,767 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 07:16:20,026 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 07:16:20,472 WARN L197 SmtUtils]: Spent 233.00 ms on a formula simplification. DAG size of input: 92 DAG size of output: 57 [2020-12-09 07:16:22,129 WARN L197 SmtUtils]: Spent 859.00 ms on a formula simplification. DAG size of input: 87 DAG size of output: 72 [2020-12-09 07:16:23,294 WARN L197 SmtUtils]: Spent 905.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 81 [2020-12-09 07:16:24,382 WARN L197 SmtUtils]: Spent 818.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 77 [2020-12-09 07:16:24,738 WARN L197 SmtUtils]: Spent 184.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 46 [2020-12-09 07:16:24,741 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 07:16:24,741 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 07:16:24,741 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 4, 4] total 46 [2020-12-09 07:16:24,741 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1577379017] [2020-12-09 07:16:24,741 INFO L461 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-12-09 07:16:24,742 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 07:16:24,742 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-12-09 07:16:24,742 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=378, Invalid=2702, Unknown=0, NotChecked=0, Total=3080 [2020-12-09 07:16:24,742 INFO L87 Difference]: Start difference. First operand 115 states and 116 transitions. Second operand 48 states. [2020-12-09 07:16:27,589 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 07:16:27,589 INFO L93 Difference]: Finished difference Result 115 states and 116 transitions. [2020-12-09 07:16:27,591 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-12-09 07:16:27,591 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 114 [2020-12-09 07:16:27,591 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 07:16:27,591 INFO L225 Difference]: With dead ends: 115 [2020-12-09 07:16:27,591 INFO L226 Difference]: Without dead ends: 0 [2020-12-09 07:16:27,592 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 399 GetRequests, 324 SyntacticMatches, 0 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1003 ImplicationChecksByTransitivity, 8.0s TimeCoverageRelationStatistics Valid=998, Invalid=4854, Unknown=0, NotChecked=0, Total=5852 [2020-12-09 07:16:27,592 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-12-09 07:16:27,592 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-12-09 07:16:27,592 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-12-09 07:16:27,592 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-12-09 07:16:27,592 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 114 [2020-12-09 07:16:27,592 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 07:16:27,593 INFO L481 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-12-09 07:16:27,593 INFO L482 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-12-09 07:16:27,593 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-12-09 07:16:27,593 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-12-09 07:16:27,794 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1975 [2020-12-09 07:16:27,807 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 09.12 07:16:27 BoogieIcfgContainer [2020-12-09 07:16:27,807 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-12-09 07:16:27,808 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-12-09 07:16:27,808 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-12-09 07:16:27,808 INFO L275 PluginConnector]: Witness Printer initialized [2020-12-09 07:16:27,809 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 07:12:23" (3/4) ... [2020-12-09 07:16:27,811 INFO L137 WitnessPrinter]: Generating witness for correct program [2020-12-09 07:16:27,816 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 14 nodes and edges [2020-12-09 07:16:27,817 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 7 nodes and edges [2020-12-09 07:16:27,817 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 2 nodes and edges [2020-12-09 07:16:27,838 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_30a406d9-f441-4710-a5e5-186db8501b7e/bin/utaipan/witness.graphml [2020-12-09 07:16:27,838 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-12-09 07:16:27,839 INFO L168 Benchmark]: Toolchain (without parser) took 245071.82 ms. Allocated memory was 102.8 MB in the beginning and 180.4 MB in the end (delta: 77.6 MB). Free memory was 81.5 MB in the beginning and 58.0 MB in the end (delta: 23.5 MB). Peak memory consumption was 101.1 MB. Max. memory is 16.1 GB. [2020-12-09 07:16:27,839 INFO L168 Benchmark]: CDTParser took 0.15 ms. Allocated memory is still 71.3 MB. Free memory is still 42.3 MB. There was no memory consumed. Max. memory is 16.1 GB. [2020-12-09 07:16:27,839 INFO L168 Benchmark]: CACSL2BoogieTranslator took 267.60 ms. Allocated memory is still 102.8 MB. Free memory was 81.3 MB in the beginning and 60.6 MB in the end (delta: 20.7 MB). Peak memory consumption was 18.9 MB. Max. memory is 16.1 GB. [2020-12-09 07:16:27,839 INFO L168 Benchmark]: Boogie Procedure Inliner took 30.03 ms. Allocated memory is still 102.8 MB. Free memory was 60.6 MB in the beginning and 58.9 MB in the end (delta: 1.8 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-12-09 07:16:27,839 INFO L168 Benchmark]: Boogie Preprocessor took 18.74 ms. Allocated memory is still 102.8 MB. Free memory was 58.9 MB in the beginning and 57.7 MB in the end (delta: 1.2 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-12-09 07:16:27,839 INFO L168 Benchmark]: RCFGBuilder took 354.42 ms. Allocated memory is still 102.8 MB. Free memory was 57.5 MB in the beginning and 69.3 MB in the end (delta: -11.8 MB). Peak memory consumption was 19.2 MB. Max. memory is 16.1 GB. [2020-12-09 07:16:27,840 INFO L168 Benchmark]: TraceAbstraction took 244366.21 ms. Allocated memory was 102.8 MB in the beginning and 180.4 MB in the end (delta: 77.6 MB). Free memory was 68.8 MB in the beginning and 60.7 MB in the end (delta: 8.2 MB). Peak memory consumption was 86.0 MB. Max. memory is 16.1 GB. [2020-12-09 07:16:27,840 INFO L168 Benchmark]: Witness Printer took 30.16 ms. Allocated memory is still 180.4 MB. Free memory was 60.7 MB in the beginning and 58.0 MB in the end (delta: 2.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-12-09 07:16:27,840 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.15 ms. Allocated memory is still 71.3 MB. Free memory is still 42.3 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 267.60 ms. Allocated memory is still 102.8 MB. Free memory was 81.3 MB in the beginning and 60.6 MB in the end (delta: 20.7 MB). Peak memory consumption was 18.9 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 30.03 ms. Allocated memory is still 102.8 MB. Free memory was 60.6 MB in the beginning and 58.9 MB in the end (delta: 1.8 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 18.74 ms. Allocated memory is still 102.8 MB. Free memory was 58.9 MB in the beginning and 57.7 MB in the end (delta: 1.2 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 354.42 ms. Allocated memory is still 102.8 MB. Free memory was 57.5 MB in the beginning and 69.3 MB in the end (delta: -11.8 MB). Peak memory consumption was 19.2 MB. Max. memory is 16.1 GB. * TraceAbstraction took 244366.21 ms. Allocated memory was 102.8 MB in the beginning and 180.4 MB in the end (delta: 77.6 MB). Free memory was 68.8 MB in the beginning and 60.7 MB in the end (delta: 8.2 MB). Peak memory consumption was 86.0 MB. Max. memory is 16.1 GB. * Witness Printer took 30.16 ms. Allocated memory is still 180.4 MB. Free memory was 60.7 MB in the beginning and 58.0 MB in the end (delta: 2.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 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. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 244.3s, OverallIterations: 44, TraceHistogramMax: 19, AutomataDifference: 60.5s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 869 SDtfs, 14517 SDslu, 17221 SDs, 0 SdLazy, 39266 SolverSat, 4737 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 17.6s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 8011 GetRequests, 5330 SyntacticMatches, 158 SemanticMatches, 2523 ConstructedPredicates, 0 IntricatePredicates, 17 DeprecatedPredicates, 49368 ImplicationChecksByTransitivity, 167.3s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=115occurred in iteration=43, 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, 44 MinimizatonAttempts, 78 StatesRemovedByMinimization, 39 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.5s SsaConstructionTime, 12.9s SatisfiabilityAnalysisTime, 65.3s InterpolantComputationTime, 4502 NumberOfCodeBlocks, 4502 NumberOfCodeBlocksAsserted, 211 NumberOfCheckSat, 6613 ConstructedInterpolants, 141 QuantifiedInterpolants, 4954424 SizeOfPredicates, 470 NumberOfNonLiveVariables, 10593 ConjunctsInSsa, 2356 ConjunctsInUnsatCore, 116 InterpolantComputations, 8 PerfectInterpolantSequences, 8048/38016 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...