./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/array-memsafety/openbsd_cstrlen-alloca-1.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version a4ecdabc Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_f9d9ad93-8b4a-442b-899f-c8f6249b4e31/bin/utaipan/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_f9d9ad93-8b4a-442b-899f-c8f6249b4e31/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_f9d9ad93-8b4a-442b-899f-c8f6249b4e31/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_f9d9ad93-8b4a-442b-899f-c8f6249b4e31/bin/utaipan/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/openbsd_cstrlen-alloca-1.i -s /tmp/vcloud-vcloud-master/worker/run_dir_f9d9ad93-8b4a-442b-899f-c8f6249b4e31/bin/utaipan/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_f9d9ad93-8b4a-442b-899f-c8f6249b4e31/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 b812e7d14425eea3a24125f5e2db40eadfc6c14c .......................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Result: TRUE --- Real Ultimate output --- This is Ultimate 0.2.0-a4ecdab [2020-11-30 02:06:49,729 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-11-30 02:06:49,732 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-11-30 02:06:49,832 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-11-30 02:06:49,832 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-11-30 02:06:49,834 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-11-30 02:06:49,836 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-11-30 02:06:49,839 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-11-30 02:06:49,841 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-11-30 02:06:49,842 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-11-30 02:06:49,844 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-11-30 02:06:49,845 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-11-30 02:06:49,846 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-11-30 02:06:49,847 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-11-30 02:06:49,849 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-11-30 02:06:49,850 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-11-30 02:06:49,852 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-11-30 02:06:49,853 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-11-30 02:06:49,855 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-11-30 02:06:49,858 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-11-30 02:06:49,860 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-11-30 02:06:49,862 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-11-30 02:06:49,863 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-11-30 02:06:49,864 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-11-30 02:06:49,868 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-11-30 02:06:49,869 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-11-30 02:06:49,869 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-11-30 02:06:49,870 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-11-30 02:06:49,871 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-11-30 02:06:49,872 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-11-30 02:06:49,872 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-11-30 02:06:49,873 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-11-30 02:06:49,874 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-11-30 02:06:49,875 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-11-30 02:06:49,876 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-11-30 02:06:49,877 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-11-30 02:06:49,877 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-11-30 02:06:49,877 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-11-30 02:06:49,878 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-11-30 02:06:49,878 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-11-30 02:06:49,883 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-11-30 02:06:49,886 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_f9d9ad93-8b4a-442b-899f-c8f6249b4e31/bin/utaipan/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2020-11-30 02:06:49,937 INFO L113 SettingsManager]: Loading preferences was successful [2020-11-30 02:06:49,937 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-11-30 02:06:49,938 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2020-11-30 02:06:49,939 INFO L138 SettingsManager]: * User list type=DISABLED [2020-11-30 02:06:49,939 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2020-11-30 02:06:49,939 INFO L138 SettingsManager]: * Explicit value domain=true [2020-11-30 02:06:49,939 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2020-11-30 02:06:49,940 INFO L138 SettingsManager]: * Octagon Domain=false [2020-11-30 02:06:49,940 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2020-11-30 02:06:49,940 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2020-11-30 02:06:49,940 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2020-11-30 02:06:49,941 INFO L138 SettingsManager]: * Interval Domain=false [2020-11-30 02:06:49,941 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2020-11-30 02:06:49,941 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2020-11-30 02:06:49,941 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2020-11-30 02:06:49,942 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-11-30 02:06:49,943 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-11-30 02:06:49,943 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-11-30 02:06:49,943 INFO L138 SettingsManager]: * sizeof long=4 [2020-11-30 02:06:49,943 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2020-11-30 02:06:49,944 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-11-30 02:06:49,944 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-11-30 02:06:49,944 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-11-30 02:06:49,944 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2020-11-30 02:06:49,945 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2020-11-30 02:06:49,945 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2020-11-30 02:06:49,945 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-11-30 02:06:49,945 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2020-11-30 02:06:49,946 INFO L138 SettingsManager]: * sizeof long double=12 [2020-11-30 02:06:49,946 INFO L138 SettingsManager]: * Use constant arrays=true [2020-11-30 02:06:49,946 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-11-30 02:06:49,947 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-11-30 02:06:49,947 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-11-30 02:06:49,947 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-30 02:06:49,947 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-11-30 02:06:49,948 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-11-30 02:06:49,948 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2020-11-30 02:06:49,948 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-11-30 02:06:49,948 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-11-30 02:06:49,949 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-11-30 02:06:49,949 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_f9d9ad93-8b4a-442b-899f-c8f6249b4e31/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_f9d9ad93-8b4a-442b-899f-c8f6249b4e31/bin/utaipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> b812e7d14425eea3a24125f5e2db40eadfc6c14c [2020-11-30 02:06:50,255 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-11-30 02:06:50,306 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-11-30 02:06:50,311 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-11-30 02:06:50,312 INFO L271 PluginConnector]: Initializing CDTParser... [2020-11-30 02:06:50,313 INFO L275 PluginConnector]: CDTParser initialized [2020-11-30 02:06:50,315 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_f9d9ad93-8b4a-442b-899f-c8f6249b4e31/bin/utaipan/../../sv-benchmarks/c/array-memsafety/openbsd_cstrlen-alloca-1.i [2020-11-30 02:06:50,423 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_f9d9ad93-8b4a-442b-899f-c8f6249b4e31/bin/utaipan/data/84f20f1a4/a4063f49f5b546d08a26fce7e25f3311/FLAGa37b9c09b [2020-11-30 02:06:51,001 INFO L306 CDTParser]: Found 1 translation units. [2020-11-30 02:06:51,002 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_f9d9ad93-8b4a-442b-899f-c8f6249b4e31/sv-benchmarks/c/array-memsafety/openbsd_cstrlen-alloca-1.i [2020-11-30 02:06:51,031 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_f9d9ad93-8b4a-442b-899f-c8f6249b4e31/bin/utaipan/data/84f20f1a4/a4063f49f5b546d08a26fce7e25f3311/FLAGa37b9c09b [2020-11-30 02:06:51,290 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_f9d9ad93-8b4a-442b-899f-c8f6249b4e31/bin/utaipan/data/84f20f1a4/a4063f49f5b546d08a26fce7e25f3311 [2020-11-30 02:06:51,293 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-11-30 02:06:51,295 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-11-30 02:06:51,303 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-11-30 02:06:51,303 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-11-30 02:06:51,317 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-11-30 02:06:51,319 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 30.11 02:06:51" (1/1) ... [2020-11-30 02:06:51,322 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4b729b96 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 02:06:51, skipping insertion in model container [2020-11-30 02:06:51,322 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 30.11 02:06:51" (1/1) ... [2020-11-30 02:06:51,333 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-11-30 02:06:51,400 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-11-30 02:06:51,813 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-30 02:06:51,824 INFO L203 MainTranslator]: Completed pre-run [2020-11-30 02:06:51,897 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-30 02:06:51,958 INFO L208 MainTranslator]: Completed translation [2020-11-30 02:06:51,959 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 02:06:51 WrapperNode [2020-11-30 02:06:51,959 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-11-30 02:06:51,961 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-11-30 02:06:51,962 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-11-30 02:06:51,962 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-11-30 02:06:51,971 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 02:06:51" (1/1) ... [2020-11-30 02:06:51,991 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 02:06:51" (1/1) ... [2020-11-30 02:06:52,014 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-11-30 02:06:52,015 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-11-30 02:06:52,015 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-11-30 02:06:52,015 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-11-30 02:06:52,025 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 02:06:51" (1/1) ... [2020-11-30 02:06:52,025 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 02:06:51" (1/1) ... [2020-11-30 02:06:52,029 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 02:06:51" (1/1) ... [2020-11-30 02:06:52,029 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 02:06:51" (1/1) ... [2020-11-30 02:06:52,046 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 02:06:51" (1/1) ... [2020-11-30 02:06:52,058 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 02:06:51" (1/1) ... [2020-11-30 02:06:52,060 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 02:06:51" (1/1) ... [2020-11-30 02:06:52,062 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-11-30 02:06:52,063 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-11-30 02:06:52,063 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-11-30 02:06:52,064 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-11-30 02:06:52,065 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 02:06:51" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_f9d9ad93-8b4a-442b-899f-c8f6249b4e31/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 [2020-11-30 02:06:52,131 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-11-30 02:06:52,131 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-11-30 02:06:52,132 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-11-30 02:06:52,132 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-11-30 02:06:52,132 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-11-30 02:06:52,132 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-11-30 02:06:52,625 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-11-30 02:06:52,626 INFO L298 CfgBuilder]: Removed 8 assume(true) statements. [2020-11-30 02:06:52,628 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 30.11 02:06:52 BoogieIcfgContainer [2020-11-30 02:06:52,628 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-11-30 02:06:52,630 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-11-30 02:06:52,630 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-11-30 02:06:52,633 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-11-30 02:06:52,634 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 30.11 02:06:51" (1/3) ... [2020-11-30 02:06:52,635 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@29d9a07b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 30.11 02:06:52, skipping insertion in model container [2020-11-30 02:06:52,635 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 02:06:51" (2/3) ... [2020-11-30 02:06:52,635 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@29d9a07b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 30.11 02:06:52, skipping insertion in model container [2020-11-30 02:06:52,636 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 30.11 02:06:52" (3/3) ... [2020-11-30 02:06:52,637 INFO L111 eAbstractionObserver]: Analyzing ICFG openbsd_cstrlen-alloca-1.i [2020-11-30 02:06:52,655 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-11-30 02:06:52,659 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 7 error locations. [2020-11-30 02:06:52,671 INFO L253 AbstractCegarLoop]: Starting to check reachability of 7 error locations. [2020-11-30 02:06:52,703 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-11-30 02:06:52,703 INFO L378 AbstractCegarLoop]: Hoare is false [2020-11-30 02:06:52,703 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-11-30 02:06:52,703 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-11-30 02:06:52,703 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-11-30 02:06:52,704 INFO L382 AbstractCegarLoop]: Difference is false [2020-11-30 02:06:52,704 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-11-30 02:06:52,704 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-11-30 02:06:52,722 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states. [2020-11-30 02:06:52,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2020-11-30 02:06:52,732 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 02:06:52,733 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1] [2020-11-30 02:06:52,734 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]=== [2020-11-30 02:06:52,744 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 02:06:52,744 INFO L82 PathProgramCache]: Analyzing trace with hash 91841, now seen corresponding path program 1 times [2020-11-30 02:06:52,755 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-30 02:06:52,755 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [135172031] [2020-11-30 02:06:52,756 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 02:06:52,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 02:06:52,953 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 02:06:52,954 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [135172031] [2020-11-30 02:06:52,954 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-30 02:06:52,955 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2020-11-30 02:06:52,956 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [93073990] [2020-11-30 02:06:52,961 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-11-30 02:06:52,961 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-30 02:06:52,978 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-11-30 02:06:52,979 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-11-30 02:06:52,981 INFO L87 Difference]: Start difference. First operand 16 states. Second operand 3 states. [2020-11-30 02:06:53,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 02:06:53,057 INFO L93 Difference]: Finished difference Result 14 states and 15 transitions. [2020-11-30 02:06:53,058 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-11-30 02:06:53,059 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 3 [2020-11-30 02:06:53,060 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 02:06:53,066 INFO L225 Difference]: With dead ends: 14 [2020-11-30 02:06:53,067 INFO L226 Difference]: Without dead ends: 13 [2020-11-30 02:06:53,068 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 [2020-11-30 02:06:53,087 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-11-30 02:06:53,099 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-11-30 02:06:53,101 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-11-30 02:06:53,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2020-11-30 02:06:53,103 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 3 [2020-11-30 02:06:53,103 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 02:06:53,103 INFO L481 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2020-11-30 02:06:53,103 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-11-30 02:06:53,104 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2020-11-30 02:06:53,104 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2020-11-30 02:06:53,104 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 02:06:53,104 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1] [2020-11-30 02:06:53,105 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-11-30 02:06:53,105 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]=== [2020-11-30 02:06:53,106 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 02:06:53,106 INFO L82 PathProgramCache]: Analyzing trace with hash 91842, now seen corresponding path program 1 times [2020-11-30 02:06:53,106 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-30 02:06:53,106 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1022261949] [2020-11-30 02:06:53,107 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 02:06:53,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 02:06:53,206 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 02:06:53,206 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1022261949] [2020-11-30 02:06:53,206 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-30 02:06:53,207 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-11-30 02:06:53,207 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2078694502] [2020-11-30 02:06:53,209 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-11-30 02:06:53,209 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-30 02:06:53,210 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-11-30 02:06:53,211 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-11-30 02:06:53,211 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 4 states. [2020-11-30 02:06:53,304 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 02:06:53,304 INFO L93 Difference]: Finished difference Result 24 states and 26 transitions. [2020-11-30 02:06:53,305 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-11-30 02:06:53,305 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 3 [2020-11-30 02:06:53,306 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 02:06:53,306 INFO L225 Difference]: With dead ends: 24 [2020-11-30 02:06:53,307 INFO L226 Difference]: Without dead ends: 24 [2020-11-30 02:06:53,308 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 [2020-11-30 02:06:53,308 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-11-30 02:06:53,311 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 15. [2020-11-30 02:06:53,311 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-11-30 02:06:53,312 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-11-30 02:06:53,312 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 3 [2020-11-30 02:06:53,312 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 02:06:53,312 INFO L481 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-11-30 02:06:53,313 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-11-30 02:06:53,313 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-11-30 02:06:53,313 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2020-11-30 02:06:53,313 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 02:06:53,313 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1] [2020-11-30 02:06:53,314 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-11-30 02:06:53,314 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]=== [2020-11-30 02:06:53,315 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 02:06:53,317 INFO L82 PathProgramCache]: Analyzing trace with hash 93215, now seen corresponding path program 1 times [2020-11-30 02:06:53,318 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-30 02:06:53,321 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [466021538] [2020-11-30 02:06:53,321 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 02:06:53,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 02:06:53,445 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 02:06:53,446 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [466021538] [2020-11-30 02:06:53,446 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-30 02:06:53,446 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2020-11-30 02:06:53,446 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [918051086] [2020-11-30 02:06:53,447 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-11-30 02:06:53,447 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-30 02:06:53,449 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-11-30 02:06:53,450 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-11-30 02:06:53,450 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 3 states. [2020-11-30 02:06:53,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 02:06:53,550 INFO L93 Difference]: Finished difference Result 14 states and 16 transitions. [2020-11-30 02:06:53,552 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-11-30 02:06:53,552 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 3 [2020-11-30 02:06:53,552 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 02:06:53,553 INFO L225 Difference]: With dead ends: 14 [2020-11-30 02:06:53,553 INFO L226 Difference]: Without dead ends: 14 [2020-11-30 02:06:53,553 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 [2020-11-30 02:06:53,554 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-11-30 02:06:53,555 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-11-30 02:06:53,555 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-11-30 02:06:53,556 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2020-11-30 02:06:53,556 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 3 [2020-11-30 02:06:53,556 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 02:06:53,556 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2020-11-30 02:06:53,556 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-11-30 02:06:53,556 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2020-11-30 02:06:53,557 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2020-11-30 02:06:53,557 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 02:06:53,557 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2020-11-30 02:06:53,557 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-11-30 02:06:53,557 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]=== [2020-11-30 02:06:53,558 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 02:06:53,558 INFO L82 PathProgramCache]: Analyzing trace with hash 2890506, now seen corresponding path program 1 times [2020-11-30 02:06:53,558 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-30 02:06:53,558 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1629692713] [2020-11-30 02:06:53,558 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 02:06:53,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 02:06:53,609 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 02:06:53,609 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1629692713] [2020-11-30 02:06:53,610 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-30 02:06:53,610 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-11-30 02:06:53,610 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [465542145] [2020-11-30 02:06:53,610 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-11-30 02:06:53,610 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-30 02:06:53,611 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-11-30 02:06:53,611 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-11-30 02:06:53,612 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand 3 states. [2020-11-30 02:06:53,641 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 02:06:53,641 INFO L93 Difference]: Finished difference Result 13 states and 15 transitions. [2020-11-30 02:06:53,642 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-11-30 02:06:53,642 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 4 [2020-11-30 02:06:53,643 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 02:06:53,643 INFO L225 Difference]: With dead ends: 13 [2020-11-30 02:06:53,643 INFO L226 Difference]: Without dead ends: 13 [2020-11-30 02:06:53,644 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 [2020-11-30 02:06:53,644 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-11-30 02:06:53,645 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-11-30 02:06:53,646 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-11-30 02:06:53,646 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 15 transitions. [2020-11-30 02:06:53,650 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 15 transitions. Word has length 4 [2020-11-30 02:06:53,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 02:06:53,650 INFO L481 AbstractCegarLoop]: Abstraction has 13 states and 15 transitions. [2020-11-30 02:06:53,650 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-11-30 02:06:53,651 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 15 transitions. [2020-11-30 02:06:53,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2020-11-30 02:06:53,651 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 02:06:53,651 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2020-11-30 02:06:53,652 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-11-30 02:06:53,652 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]=== [2020-11-30 02:06:53,653 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 02:06:53,653 INFO L82 PathProgramCache]: Analyzing trace with hash 2890507, now seen corresponding path program 1 times [2020-11-30 02:06:53,654 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-30 02:06:53,654 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [949995506] [2020-11-30 02:06:53,655 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 02:06:53,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 02:06:53,716 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 02:06:53,716 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [949995506] [2020-11-30 02:06:53,716 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-30 02:06:53,717 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-11-30 02:06:53,717 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [970077247] [2020-11-30 02:06:53,717 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-11-30 02:06:53,717 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-30 02:06:53,718 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-11-30 02:06:53,718 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-11-30 02:06:53,719 INFO L87 Difference]: Start difference. First operand 13 states and 15 transitions. Second operand 4 states. [2020-11-30 02:06:53,761 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 02:06:53,761 INFO L93 Difference]: Finished difference Result 14 states and 16 transitions. [2020-11-30 02:06:53,762 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-11-30 02:06:53,762 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 4 [2020-11-30 02:06:53,762 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 02:06:53,762 INFO L225 Difference]: With dead ends: 14 [2020-11-30 02:06:53,763 INFO L226 Difference]: Without dead ends: 14 [2020-11-30 02:06:53,763 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 [2020-11-30 02:06:53,763 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-11-30 02:06:53,765 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-11-30 02:06:53,765 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-11-30 02:06:53,766 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2020-11-30 02:06:53,766 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 4 [2020-11-30 02:06:53,766 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 02:06:53,767 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2020-11-30 02:06:53,767 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-11-30 02:06:53,767 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2020-11-30 02:06:53,767 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2020-11-30 02:06:53,767 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 02:06:53,768 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1] [2020-11-30 02:06:53,768 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-11-30 02:06:53,768 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]=== [2020-11-30 02:06:53,769 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 02:06:53,769 INFO L82 PathProgramCache]: Analyzing trace with hash 88298188, now seen corresponding path program 1 times [2020-11-30 02:06:53,769 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-30 02:06:53,769 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2103196285] [2020-11-30 02:06:53,770 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 02:06:53,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 02:06:53,873 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 02:06:53,873 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2103196285] [2020-11-30 02:06:53,873 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [747270789] [2020-11-30 02:06:53,874 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_f9d9ad93-8b4a-442b-899f-c8f6249b4e31/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 [2020-11-30 02:06:53,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 02:06:53,951 INFO L263 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 11 conjunts are in the unsatisfiable core [2020-11-30 02:06:53,974 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-30 02:06:54,045 INFO L384 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 [2020-11-30 02:06:54,045 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-11-30 02:06:54,056 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-30 02:06:54,056 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2020-11-30 02:06:54,056 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:13, output treesize:12 [2020-11-30 02:06:54,104 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 02:06:54,104 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-30 02:06:54,170 INFO L603 QuantifierPusher]: Distributing 2 disjuncts over 3 conjuncts [2020-11-30 02:06:54,229 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 02:06:54,229 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [113633057] [2020-11-30 02:06:54,253 INFO L159 IcfgInterpreter]: Started Sifa with 4 locations of interest [2020-11-30 02:06:54,254 INFO L166 IcfgInterpreter]: Building call graph [2020-11-30 02:06:54,259 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-30 02:06:54,266 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-30 02:06:54,267 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-30 02:06:54,545 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-11-30 02:06:54,773 INFO L180 IcfgInterpreter]: Interpretation finished [2020-11-30 02:06:54,912 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 43 DAG size of output: 34 [2020-11-30 02:06:55,107 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-11-30 02:06:55,107 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-30 02:06:55,107 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 7 [2020-11-30 02:06:55,108 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [929884229] [2020-11-30 02:06:55,108 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-11-30 02:06:55,108 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-30 02:06:55,110 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-11-30 02:06:55,111 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2020-11-30 02:06:55,113 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand 9 states. [2020-11-30 02:06:55,292 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 02:06:55,293 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2020-11-30 02:06:55,293 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-11-30 02:06:55,293 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 5 [2020-11-30 02:06:55,294 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 02:06:55,294 INFO L225 Difference]: With dead ends: 30 [2020-11-30 02:06:55,294 INFO L226 Difference]: Without dead ends: 30 [2020-11-30 02:06:55,295 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-11-30 02:06:55,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-11-30 02:06:55,297 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 11. [2020-11-30 02:06:55,297 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2020-11-30 02:06:55,297 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 12 transitions. [2020-11-30 02:06:55,298 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 12 transitions. Word has length 5 [2020-11-30 02:06:55,298 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 02:06:55,298 INFO L481 AbstractCegarLoop]: Abstraction has 11 states and 12 transitions. [2020-11-30 02:06:55,298 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-11-30 02:06:55,298 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 12 transitions. [2020-11-30 02:06:55,298 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2020-11-30 02:06:55,298 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 02:06:55,298 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2020-11-30 02:06:55,509 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2020-11-30 02:06:55,510 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]=== [2020-11-30 02:06:55,510 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 02:06:55,511 INFO L82 PathProgramCache]: Analyzing trace with hash -1517190188, now seen corresponding path program 1 times [2020-11-30 02:06:55,511 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-30 02:06:55,511 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [153927935] [2020-11-30 02:06:55,511 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 02:06:55,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 02:06:55,644 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 02:06:55,644 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [153927935] [2020-11-30 02:06:55,644 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-30 02:06:55,644 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-11-30 02:06:55,644 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [694961617] [2020-11-30 02:06:55,645 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-11-30 02:06:55,645 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-30 02:06:55,645 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-11-30 02:06:55,646 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-11-30 02:06:55,646 INFO L87 Difference]: Start difference. First operand 11 states and 12 transitions. Second operand 6 states. [2020-11-30 02:06:55,740 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 02:06:55,740 INFO L93 Difference]: Finished difference Result 19 states and 20 transitions. [2020-11-30 02:06:55,742 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-11-30 02:06:55,742 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 6 [2020-11-30 02:06:55,742 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 02:06:55,743 INFO L225 Difference]: With dead ends: 19 [2020-11-30 02:06:55,743 INFO L226 Difference]: Without dead ends: 19 [2020-11-30 02:06:55,743 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2020-11-30 02:06:55,744 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-11-30 02:06:55,745 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 15. [2020-11-30 02:06:55,746 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-11-30 02:06:55,746 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-11-30 02:06:55,746 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 6 [2020-11-30 02:06:55,747 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 02:06:55,747 INFO L481 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-11-30 02:06:55,747 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-11-30 02:06:55,747 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-11-30 02:06:55,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2020-11-30 02:06:55,748 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 02:06:55,748 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2020-11-30 02:06:55,748 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-11-30 02:06:55,748 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]=== [2020-11-30 02:06:55,749 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 02:06:55,749 INFO L82 PathProgramCache]: Analyzing trace with hash 211727863, now seen corresponding path program 1 times [2020-11-30 02:06:55,749 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-30 02:06:55,749 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [388103646] [2020-11-30 02:06:55,750 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 02:06:55,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 02:06:55,854 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 02:06:55,854 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [388103646] [2020-11-30 02:06:55,855 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-30 02:06:55,855 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-11-30 02:06:55,855 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1233718891] [2020-11-30 02:06:55,855 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-11-30 02:06:55,855 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-30 02:06:55,856 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-11-30 02:06:55,856 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-11-30 02:06:55,856 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 4 states. [2020-11-30 02:06:55,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 02:06:55,875 INFO L93 Difference]: Finished difference Result 14 states and 16 transitions. [2020-11-30 02:06:55,876 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-11-30 02:06:55,877 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 7 [2020-11-30 02:06:55,877 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 02:06:55,877 INFO L225 Difference]: With dead ends: 14 [2020-11-30 02:06:55,877 INFO L226 Difference]: Without dead ends: 9 [2020-11-30 02:06:55,878 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 [2020-11-30 02:06:55,878 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2020-11-30 02:06:55,879 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2020-11-30 02:06:55,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2020-11-30 02:06:55,879 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 10 transitions. [2020-11-30 02:06:55,880 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 10 transitions. Word has length 7 [2020-11-30 02:06:55,880 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 02:06:55,880 INFO L481 AbstractCegarLoop]: Abstraction has 9 states and 10 transitions. [2020-11-30 02:06:55,880 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-11-30 02:06:55,880 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 10 transitions. [2020-11-30 02:06:55,881 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2020-11-30 02:06:55,881 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 02:06:55,881 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2020-11-30 02:06:55,881 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-11-30 02:06:55,881 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]=== [2020-11-30 02:06:55,882 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 02:06:55,882 INFO L82 PathProgramCache]: Analyzing trace with hash 2013045642, now seen corresponding path program 1 times [2020-11-30 02:06:55,882 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-30 02:06:55,882 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [459687598] [2020-11-30 02:06:55,882 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 02:06:55,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 02:06:56,011 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 02:06:56,012 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [459687598] [2020-11-30 02:06:56,012 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [314653941] [2020-11-30 02:06:56,012 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_f9d9ad93-8b4a-442b-899f-c8f6249b4e31/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 [2020-11-30 02:06:56,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 02:06:56,078 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 22 conjunts are in the unsatisfiable core [2020-11-30 02:06:56,081 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-30 02:06:56,226 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 02:06:56,226 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-30 02:06:56,367 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 02:06:56,367 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1633933060] [2020-11-30 02:06:56,369 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2020-11-30 02:06:56,369 INFO L166 IcfgInterpreter]: Building call graph [2020-11-30 02:06:56,370 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-30 02:06:56,370 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-30 02:06:56,371 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-30 02:06:56,525 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-11-30 02:06:57,049 INFO L180 IcfgInterpreter]: Interpretation finished [2020-11-30 02:06:57,346 WARN L193 SmtUtils]: Spent 236.00 ms on a formula simplification. DAG size of input: 79 DAG size of output: 44 [2020-11-30 02:06:58,173 WARN L193 SmtUtils]: Spent 399.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 64 [2020-11-30 02:06:58,340 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 44 DAG size of output: 38 [2020-11-30 02:06:58,341 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-11-30 02:06:58,341 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-30 02:06:58,341 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 15 [2020-11-30 02:06:58,341 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2146214669] [2020-11-30 02:06:58,342 INFO L461 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-11-30 02:06:58,342 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-30 02:06:58,342 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-11-30 02:06:58,343 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=427, Unknown=0, NotChecked=0, Total=506 [2020-11-30 02:06:58,343 INFO L87 Difference]: Start difference. First operand 9 states and 10 transitions. Second operand 17 states. [2020-11-30 02:06:58,646 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 02:06:58,646 INFO L93 Difference]: Finished difference Result 13 states and 14 transitions. [2020-11-30 02:06:58,647 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-11-30 02:06:58,647 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 8 [2020-11-30 02:06:58,647 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 02:06:58,647 INFO L225 Difference]: With dead ends: 13 [2020-11-30 02:06:58,647 INFO L226 Difference]: Without dead ends: 13 [2020-11-30 02:06:58,648 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 179 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=132, Invalid=624, Unknown=0, NotChecked=0, Total=756 [2020-11-30 02:06:58,648 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-11-30 02:06:58,649 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 11. [2020-11-30 02:06:58,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2020-11-30 02:06:58,650 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 12 transitions. [2020-11-30 02:06:58,650 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 12 transitions. Word has length 8 [2020-11-30 02:06:58,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 02:06:58,650 INFO L481 AbstractCegarLoop]: Abstraction has 11 states and 12 transitions. [2020-11-30 02:06:58,650 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-11-30 02:06:58,651 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 12 transitions. [2020-11-30 02:06:58,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-11-30 02:06:58,651 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 02:06:58,651 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1] [2020-11-30 02:06:58,859 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2020-11-30 02:06:58,860 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]=== [2020-11-30 02:06:58,860 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 02:06:58,860 INFO L82 PathProgramCache]: Analyzing trace with hash 1801578643, now seen corresponding path program 2 times [2020-11-30 02:06:58,860 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-30 02:06:58,860 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1028115386] [2020-11-30 02:06:58,860 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 02:06:58,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 02:06:59,176 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 02:06:59,177 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1028115386] [2020-11-30 02:06:59,177 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1547463832] [2020-11-30 02:06:59,177 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_f9d9ad93-8b4a-442b-899f-c8f6249b4e31/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 [2020-11-30 02:06:59,260 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2020-11-30 02:06:59,261 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-30 02:06:59,262 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 27 conjunts are in the unsatisfiable core [2020-11-30 02:06:59,265 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-30 02:06:59,548 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 02:06:59,548 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-30 02:06:59,817 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 02:06:59,817 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1984445473] [2020-11-30 02:06:59,820 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2020-11-30 02:06:59,820 INFO L166 IcfgInterpreter]: Building call graph [2020-11-30 02:06:59,821 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-30 02:06:59,821 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-30 02:06:59,821 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-30 02:06:59,989 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-11-30 02:07:00,453 INFO L180 IcfgInterpreter]: Interpretation finished [2020-11-30 02:07:00,778 WARN L193 SmtUtils]: Spent 229.00 ms on a formula simplification. DAG size of input: 79 DAG size of output: 44 [2020-11-30 02:07:01,608 WARN L193 SmtUtils]: Spent 452.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 64 [2020-11-30 02:07:01,814 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 44 DAG size of output: 38 [2020-11-30 02:07:01,815 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-11-30 02:07:01,816 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-30 02:07:01,816 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 18 [2020-11-30 02:07:01,816 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [819606040] [2020-11-30 02:07:01,817 INFO L461 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-11-30 02:07:01,817 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-30 02:07:01,817 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-11-30 02:07:01,818 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=516, Unknown=0, NotChecked=0, Total=600 [2020-11-30 02:07:01,818 INFO L87 Difference]: Start difference. First operand 11 states and 12 transitions. Second operand 19 states. [2020-11-30 02:07:02,111 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 02:07:02,111 INFO L93 Difference]: Finished difference Result 19 states and 20 transitions. [2020-11-30 02:07:02,112 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-11-30 02:07:02,112 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 10 [2020-11-30 02:07:02,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 02:07:02,112 INFO L225 Difference]: With dead ends: 19 [2020-11-30 02:07:02,113 INFO L226 Difference]: Without dead ends: 14 [2020-11-30 02:07:02,113 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 11 SyntacticMatches, 3 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 2 DeprecatedPredicates, 256 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=140, Invalid=730, Unknown=0, NotChecked=0, Total=870 [2020-11-30 02:07:02,113 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-11-30 02:07:02,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 13. [2020-11-30 02:07:02,115 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-11-30 02:07:02,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2020-11-30 02:07:02,115 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 10 [2020-11-30 02:07:02,115 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 02:07:02,116 INFO L481 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2020-11-30 02:07:02,116 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-11-30 02:07:02,116 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2020-11-30 02:07:02,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-11-30 02:07:02,116 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 02:07:02,116 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1] [2020-11-30 02:07:02,317 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable71,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-30 02:07:02,317 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]=== [2020-11-30 02:07:02,317 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 02:07:02,318 INFO L82 PathProgramCache]: Analyzing trace with hash -819315383, now seen corresponding path program 3 times [2020-11-30 02:07:02,318 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-30 02:07:02,318 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1496569276] [2020-11-30 02:07:02,318 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 02:07:02,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 02:07:02,497 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 02:07:02,497 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1496569276] [2020-11-30 02:07:02,497 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [312910603] [2020-11-30 02:07:02,498 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_f9d9ad93-8b4a-442b-899f-c8f6249b4e31/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 [2020-11-30 02:07:02,566 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-11-30 02:07:02,566 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-30 02:07:02,567 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 23 conjunts are in the unsatisfiable core [2020-11-30 02:07:02,568 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-30 02:07:02,628 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 02:07:02,628 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-30 02:07:02,775 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 02:07:02,776 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [641016021] [2020-11-30 02:07:02,778 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2020-11-30 02:07:02,778 INFO L166 IcfgInterpreter]: Building call graph [2020-11-30 02:07:02,779 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-30 02:07:02,779 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-30 02:07:02,779 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-30 02:07:02,902 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-11-30 02:07:03,406 INFO L180 IcfgInterpreter]: Interpretation finished [2020-11-30 02:07:03,722 WARN L193 SmtUtils]: Spent 237.00 ms on a formula simplification. DAG size of input: 79 DAG size of output: 44 [2020-11-30 02:07:04,495 WARN L193 SmtUtils]: Spent 328.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 64 [2020-11-30 02:07:04,659 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 44 DAG size of output: 38 [2020-11-30 02:07:04,659 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-11-30 02:07:04,660 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-30 02:07:04,660 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 14 [2020-11-30 02:07:04,660 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [995207341] [2020-11-30 02:07:04,660 INFO L461 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-11-30 02:07:04,660 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-30 02:07:04,661 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-11-30 02:07:04,661 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=392, Unknown=0, NotChecked=0, Total=462 [2020-11-30 02:07:04,661 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 16 states. [2020-11-30 02:07:04,919 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 02:07:04,919 INFO L93 Difference]: Finished difference Result 16 states and 17 transitions. [2020-11-30 02:07:04,920 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-11-30 02:07:04,920 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 12 [2020-11-30 02:07:04,920 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 02:07:04,920 INFO L225 Difference]: With dead ends: 16 [2020-11-30 02:07:04,920 INFO L226 Difference]: Without dead ends: 16 [2020-11-30 02:07:04,921 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 19 SyntacticMatches, 2 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 128 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=124, Invalid=578, Unknown=0, NotChecked=0, Total=702 [2020-11-30 02:07:04,921 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-11-30 02:07:04,922 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2020-11-30 02:07:04,922 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-11-30 02:07:04,923 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2020-11-30 02:07:04,923 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 12 [2020-11-30 02:07:04,923 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 02:07:04,923 INFO L481 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2020-11-30 02:07:04,923 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-11-30 02:07:04,923 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2020-11-30 02:07:04,924 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-11-30 02:07:04,924 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 02:07:04,924 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1] [2020-11-30 02:07:05,124 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable115,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-30 02:07:05,125 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]=== [2020-11-30 02:07:05,125 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 02:07:05,125 INFO L82 PathProgramCache]: Analyzing trace with hash -1383068014, now seen corresponding path program 4 times [2020-11-30 02:07:05,125 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-30 02:07:05,125 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [934538489] [2020-11-30 02:07:05,126 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 02:07:05,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 02:07:05,296 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 3 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 02:07:05,297 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [934538489] [2020-11-30 02:07:05,297 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1105976583] [2020-11-30 02:07:05,297 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_f9d9ad93-8b4a-442b-899f-c8f6249b4e31/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 [2020-11-30 02:07:05,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 02:07:05,366 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 29 conjunts are in the unsatisfiable core [2020-11-30 02:07:05,367 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-30 02:07:05,709 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 02:07:05,709 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-30 02:07:06,260 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 02:07:06,260 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [899161646] [2020-11-30 02:07:06,262 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2020-11-30 02:07:06,262 INFO L166 IcfgInterpreter]: Building call graph [2020-11-30 02:07:06,262 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-30 02:07:06,263 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-30 02:07:06,263 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-30 02:07:06,602 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-11-30 02:07:06,674 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-11-30 02:07:06,879 INFO L180 IcfgInterpreter]: Interpretation finished [2020-11-30 02:07:07,077 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 42 [2020-11-30 02:07:07,377 WARN L193 SmtUtils]: Spent 194.00 ms on a formula simplification. DAG size of input: 77 DAG size of output: 60 [2020-11-30 02:07:07,923 WARN L193 SmtUtils]: Spent 308.00 ms on a formula simplification. DAG size of input: 79 DAG size of output: 62 [2020-11-30 02:07:08,112 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 44 DAG size of output: 38 [2020-11-30 02:07:08,114 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-11-30 02:07:08,114 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-30 02:07:08,114 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 26 [2020-11-30 02:07:08,114 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [398822753] [2020-11-30 02:07:08,115 INFO L461 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-11-30 02:07:08,115 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-30 02:07:08,115 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-11-30 02:07:08,116 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=887, Unknown=0, NotChecked=0, Total=992 [2020-11-30 02:07:08,116 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 27 states. [2020-11-30 02:07:08,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 02:07:08,635 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2020-11-30 02:07:08,635 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-11-30 02:07:08,635 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 14 [2020-11-30 02:07:08,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 02:07:08,636 INFO L225 Difference]: With dead ends: 25 [2020-11-30 02:07:08,636 INFO L226 Difference]: Without dead ends: 18 [2020-11-30 02:07:08,637 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 239 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=228, Invalid=1412, Unknown=0, NotChecked=0, Total=1640 [2020-11-30 02:07:08,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-11-30 02:07:08,638 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17. [2020-11-30 02:07:08,638 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-11-30 02:07:08,639 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2020-11-30 02:07:08,639 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 14 [2020-11-30 02:07:08,639 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 02:07:08,639 INFO L481 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2020-11-30 02:07:08,639 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-11-30 02:07:08,639 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2020-11-30 02:07:08,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-11-30 02:07:08,640 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 02:07:08,640 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1] [2020-11-30 02:07:08,840 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable160 [2020-11-30 02:07:08,840 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]=== [2020-11-30 02:07:08,841 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 02:07:08,841 INFO L82 PathProgramCache]: Analyzing trace with hash -1760356280, now seen corresponding path program 5 times [2020-11-30 02:07:08,841 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-30 02:07:08,841 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1190771475] [2020-11-30 02:07:08,842 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 02:07:08,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 02:07:09,012 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 1 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 02:07:09,013 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1190771475] [2020-11-30 02:07:09,013 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1527108506] [2020-11-30 02:07:09,013 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_f9d9ad93-8b4a-442b-899f-c8f6249b4e31/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 [2020-11-30 02:07:09,083 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2020-11-30 02:07:09,083 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-30 02:07:09,084 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 30 conjunts are in the unsatisfiable core [2020-11-30 02:07:09,086 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-30 02:07:09,367 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 4 proven. 14 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 02:07:09,368 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-30 02:07:09,718 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 9 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 02:07:09,718 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1379908136] [2020-11-30 02:07:09,721 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2020-11-30 02:07:09,721 INFO L166 IcfgInterpreter]: Building call graph [2020-11-30 02:07:09,721 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-30 02:07:09,721 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-30 02:07:09,721 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-30 02:07:10,112 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-11-30 02:07:10,123 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-11-30 02:07:10,349 INFO L180 IcfgInterpreter]: Interpretation finished [2020-11-30 02:07:10,525 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 42 [2020-11-30 02:07:10,794 WARN L193 SmtUtils]: Spent 195.00 ms on a formula simplification. DAG size of input: 77 DAG size of output: 60 [2020-11-30 02:07:11,165 WARN L193 SmtUtils]: Spent 194.00 ms on a formula simplification. DAG size of input: 79 DAG size of output: 62 [2020-11-30 02:07:11,301 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-11-30 02:07:11,301 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-30 02:07:11,302 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 27 [2020-11-30 02:07:11,302 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1618197853] [2020-11-30 02:07:11,302 INFO L461 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-11-30 02:07:11,302 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-30 02:07:11,303 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-11-30 02:07:11,303 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=979, Unknown=0, NotChecked=0, Total=1122 [2020-11-30 02:07:11,304 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand 29 states. [2020-11-30 02:07:11,745 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 02:07:11,745 INFO L93 Difference]: Finished difference Result 20 states and 21 transitions. [2020-11-30 02:07:11,753 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-11-30 02:07:11,753 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 16 [2020-11-30 02:07:11,753 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 02:07:11,753 INFO L225 Difference]: With dead ends: 20 [2020-11-30 02:07:11,753 INFO L226 Difference]: Without dead ends: 20 [2020-11-30 02:07:11,755 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 371 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=261, Invalid=1299, Unknown=0, NotChecked=0, Total=1560 [2020-11-30 02:07:11,755 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-11-30 02:07:11,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 19. [2020-11-30 02:07:11,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-11-30 02:07:11,757 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2020-11-30 02:07:11,757 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 16 [2020-11-30 02:07:11,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 02:07:11,758 INFO L481 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2020-11-30 02:07:11,758 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-11-30 02:07:11,758 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2020-11-30 02:07:11,759 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-11-30 02:07:11,759 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 02:07:11,759 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 1, 1, 1, 1] [2020-11-30 02:07:11,971 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable215,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-30 02:07:11,971 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]=== [2020-11-30 02:07:11,972 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 02:07:11,972 INFO L82 PathProgramCache]: Analyzing trace with hash 514729425, now seen corresponding path program 6 times [2020-11-30 02:07:11,972 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-30 02:07:11,972 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1869255316] [2020-11-30 02:07:11,972 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 02:07:11,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 02:07:12,185 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 02:07:12,186 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1869255316] [2020-11-30 02:07:12,186 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [177060242] [2020-11-30 02:07:12,186 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_f9d9ad93-8b4a-442b-899f-c8f6249b4e31/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 [2020-11-30 02:07:12,262 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-11-30 02:07:12,262 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-30 02:07:12,264 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 37 conjunts are in the unsatisfiable core [2020-11-30 02:07:12,266 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-30 02:07:12,534 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 02:07:12,534 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-30 02:07:12,698 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 02:07:12,699 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1746218926] [2020-11-30 02:07:12,701 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2020-11-30 02:07:12,701 INFO L166 IcfgInterpreter]: Building call graph [2020-11-30 02:07:12,701 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-30 02:07:12,702 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-30 02:07:12,702 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-30 02:07:13,146 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-11-30 02:07:13,158 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-11-30 02:07:13,330 INFO L180 IcfgInterpreter]: Interpretation finished [2020-11-30 02:07:13,467 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 42 [2020-11-30 02:07:13,703 WARN L193 SmtUtils]: Spent 182.00 ms on a formula simplification. DAG size of input: 77 DAG size of output: 60 [2020-11-30 02:07:14,084 WARN L193 SmtUtils]: Spent 202.00 ms on a formula simplification. DAG size of input: 79 DAG size of output: 62 [2020-11-30 02:07:14,222 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-11-30 02:07:14,222 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-30 02:07:14,222 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 22 [2020-11-30 02:07:14,222 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [717527154] [2020-11-30 02:07:14,222 INFO L461 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-11-30 02:07:14,223 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-30 02:07:14,223 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-11-30 02:07:14,224 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=677, Unknown=0, NotChecked=0, Total=756 [2020-11-30 02:07:14,224 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand 23 states. [2020-11-30 02:07:14,779 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 02:07:14,779 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2020-11-30 02:07:14,780 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-11-30 02:07:14,780 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 18 [2020-11-30 02:07:14,780 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 02:07:14,781 INFO L225 Difference]: With dead ends: 31 [2020-11-30 02:07:14,781 INFO L226 Difference]: Without dead ends: 22 [2020-11-30 02:07:14,782 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 34 SyntacticMatches, 5 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 212 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=161, Invalid=1171, Unknown=0, NotChecked=0, Total=1332 [2020-11-30 02:07:14,782 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-11-30 02:07:14,788 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2020-11-30 02:07:14,789 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-11-30 02:07:14,789 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-11-30 02:07:14,790 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 18 [2020-11-30 02:07:14,790 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 02:07:14,790 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-11-30 02:07:14,790 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-11-30 02:07:14,790 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-11-30 02:07:14,791 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-11-30 02:07:14,791 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 02:07:14,791 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1] [2020-11-30 02:07:15,007 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable270,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-30 02:07:15,008 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]=== [2020-11-30 02:07:15,008 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 02:07:15,008 INFO L82 PathProgramCache]: Analyzing trace with hash 394880135, now seen corresponding path program 7 times [2020-11-30 02:07:15,008 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-30 02:07:15,008 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1432596053] [2020-11-30 02:07:15,008 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 02:07:15,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 02:07:15,218 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 4 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 02:07:15,218 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1432596053] [2020-11-30 02:07:15,218 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1692767155] [2020-11-30 02:07:15,218 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_f9d9ad93-8b4a-442b-899f-c8f6249b4e31/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 [2020-11-30 02:07:15,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 02:07:15,271 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 37 conjunts are in the unsatisfiable core [2020-11-30 02:07:15,273 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-30 02:07:15,597 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 9 proven. 23 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 02:07:15,598 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-30 02:07:16,039 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 16 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 02:07:16,040 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [993986844] [2020-11-30 02:07:16,041 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2020-11-30 02:07:16,042 INFO L166 IcfgInterpreter]: Building call graph [2020-11-30 02:07:16,042 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-30 02:07:16,042 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-30 02:07:16,042 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-30 02:07:16,155 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-11-30 02:07:16,405 INFO L180 IcfgInterpreter]: Interpretation finished [2020-11-30 02:07:16,638 WARN L193 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 79 DAG size of output: 44 [2020-11-30 02:07:17,442 WARN L193 SmtUtils]: Spent 451.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 64 [2020-11-30 02:07:17,595 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-11-30 02:07:17,596 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-30 02:07:17,596 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 33 [2020-11-30 02:07:17,596 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1326841737] [2020-11-30 02:07:17,596 INFO L461 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-11-30 02:07:17,596 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-30 02:07:17,597 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-11-30 02:07:17,598 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=1444, Unknown=0, NotChecked=0, Total=1640 [2020-11-30 02:07:17,598 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 35 states. [2020-11-30 02:07:18,056 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 02:07:18,056 INFO L93 Difference]: Finished difference Result 24 states and 25 transitions. [2020-11-30 02:07:18,056 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-11-30 02:07:18,056 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 20 [2020-11-30 02:07:18,057 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 02:07:18,057 INFO L225 Difference]: With dead ends: 24 [2020-11-30 02:07:18,057 INFO L226 Difference]: Without dead ends: 24 [2020-11-30 02:07:18,058 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 651 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=348, Invalid=1908, Unknown=0, NotChecked=0, Total=2256 [2020-11-30 02:07:18,058 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-11-30 02:07:18,060 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2020-11-30 02:07:18,061 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-11-30 02:07:18,061 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2020-11-30 02:07:18,061 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 20 [2020-11-30 02:07:18,062 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 02:07:18,062 INFO L481 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2020-11-30 02:07:18,062 INFO L482 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-11-30 02:07:18,062 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2020-11-30 02:07:18,063 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-11-30 02:07:18,063 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 02:07:18,063 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 1, 1, 1, 1] [2020-11-30 02:07:18,275 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable325 [2020-11-30 02:07:18,276 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]=== [2020-11-30 02:07:18,276 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 02:07:18,276 INFO L82 PathProgramCache]: Analyzing trace with hash 1522687568, now seen corresponding path program 8 times [2020-11-30 02:07:18,276 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-30 02:07:18,276 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [842701679] [2020-11-30 02:07:18,276 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 02:07:18,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 02:07:18,517 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 5 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 02:07:18,518 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [842701679] [2020-11-30 02:07:18,518 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1996382871] [2020-11-30 02:07:18,518 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_f9d9ad93-8b4a-442b-899f-c8f6249b4e31/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 [2020-11-30 02:07:18,590 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2020-11-30 02:07:18,590 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-30 02:07:18,591 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 32 conjunts are in the unsatisfiable core [2020-11-30 02:07:18,593 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-30 02:07:18,859 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2020-11-30 02:07:18,860 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-30 02:07:19,141 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2020-11-30 02:07:19,141 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [398207983] [2020-11-30 02:07:19,143 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2020-11-30 02:07:19,143 INFO L166 IcfgInterpreter]: Building call graph [2020-11-30 02:07:19,143 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-30 02:07:19,144 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-30 02:07:19,144 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-30 02:07:19,529 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-11-30 02:07:19,544 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-11-30 02:07:19,725 INFO L180 IcfgInterpreter]: Interpretation finished [2020-11-30 02:07:19,964 WARN L193 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 42 [2020-11-30 02:07:20,237 WARN L193 SmtUtils]: Spent 190.00 ms on a formula simplification. DAG size of input: 77 DAG size of output: 60 [2020-11-30 02:07:20,611 WARN L193 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 79 DAG size of output: 62 [2020-11-30 02:07:20,849 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 44 DAG size of output: 38 [2020-11-30 02:07:20,851 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-11-30 02:07:20,851 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-30 02:07:20,851 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 4, 4] total 22 [2020-11-30 02:07:20,851 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [824270836] [2020-11-30 02:07:20,851 INFO L461 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-11-30 02:07:20,852 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-30 02:07:20,852 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-11-30 02:07:20,852 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=694, Unknown=0, NotChecked=0, Total=756 [2020-11-30 02:07:20,852 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand 23 states. [2020-11-30 02:07:22,010 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 02:07:22,010 INFO L93 Difference]: Finished difference Result 36 states and 37 transitions. [2020-11-30 02:07:22,010 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-11-30 02:07:22,010 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 22 [2020-11-30 02:07:22,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 02:07:22,011 INFO L225 Difference]: With dead ends: 36 [2020-11-30 02:07:22,011 INFO L226 Difference]: Without dead ends: 0 [2020-11-30 02:07:22,012 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 52 SyntacticMatches, 1 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 209 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=299, Invalid=1957, Unknown=0, NotChecked=0, Total=2256 [2020-11-30 02:07:22,012 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-11-30 02:07:22,012 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-11-30 02:07:22,012 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-11-30 02:07:22,013 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-11-30 02:07:22,013 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 22 [2020-11-30 02:07:22,013 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 02:07:22,013 INFO L481 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-11-30 02:07:22,013 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-11-30 02:07:22,013 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-11-30 02:07:22,013 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-11-30 02:07:22,214 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable369,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-30 02:07:22,218 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 30.11 02:07:22 BoogieIcfgContainer [2020-11-30 02:07:22,218 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-11-30 02:07:22,219 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-11-30 02:07:22,219 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-11-30 02:07:22,219 INFO L275 PluginConnector]: Witness Printer initialized [2020-11-30 02:07:22,220 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 30.11 02:06:52" (3/4) ... [2020-11-30 02:07:22,223 INFO L137 WitnessPrinter]: Generating witness for correct program [2020-11-30 02:07:22,233 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 13 nodes and edges [2020-11-30 02:07:22,233 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 6 nodes and edges [2020-11-30 02:07:22,233 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 2 nodes and edges [2020-11-30 02:07:22,272 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_f9d9ad93-8b4a-442b-899f-c8f6249b4e31/bin/utaipan/witness.graphml [2020-11-30 02:07:22,272 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-11-30 02:07:22,273 INFO L168 Benchmark]: Toolchain (without parser) took 30977.77 ms. Allocated memory was 96.5 MB in the beginning and 283.1 MB in the end (delta: 186.6 MB). Free memory was 63.9 MB in the beginning and 163.8 MB in the end (delta: -99.9 MB). Peak memory consumption was 86.1 MB. Max. memory is 16.1 GB. [2020-11-30 02:07:22,274 INFO L168 Benchmark]: CDTParser took 0.41 ms. Allocated memory is still 96.5 MB. Free memory was 53.5 MB in the beginning and 53.5 MB in the end (delta: 39.5 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-30 02:07:22,274 INFO L168 Benchmark]: CACSL2BoogieTranslator took 656.87 ms. Allocated memory was 96.5 MB in the beginning and 134.2 MB in the end (delta: 37.7 MB). Free memory was 63.6 MB in the beginning and 99.7 MB in the end (delta: -36.1 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2020-11-30 02:07:22,275 INFO L168 Benchmark]: Boogie Procedure Inliner took 52.92 ms. Allocated memory is still 134.2 MB. Free memory was 99.7 MB in the beginning and 98.1 MB in the end (delta: 1.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-30 02:07:22,275 INFO L168 Benchmark]: Boogie Preprocessor took 47.64 ms. Allocated memory is still 134.2 MB. Free memory was 98.1 MB in the beginning and 96.6 MB in the end (delta: 1.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-30 02:07:22,276 INFO L168 Benchmark]: RCFGBuilder took 565.13 ms. Allocated memory is still 134.2 MB. Free memory was 96.6 MB in the beginning and 75.1 MB in the end (delta: 21.5 MB). Peak memory consumption was 21.0 MB. Max. memory is 16.1 GB. [2020-11-30 02:07:22,276 INFO L168 Benchmark]: TraceAbstraction took 29588.66 ms. Allocated memory was 134.2 MB in the beginning and 283.1 MB in the end (delta: 148.9 MB). Free memory was 74.6 MB in the beginning and 166.4 MB in the end (delta: -91.8 MB). Peak memory consumption was 59.1 MB. Max. memory is 16.1 GB. [2020-11-30 02:07:22,277 INFO L168 Benchmark]: Witness Printer took 53.17 ms. Allocated memory is still 283.1 MB. Free memory was 166.4 MB in the beginning and 163.8 MB in the end (delta: 2.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-30 02:07:22,279 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.41 ms. Allocated memory is still 96.5 MB. Free memory was 53.5 MB in the beginning and 53.5 MB in the end (delta: 39.5 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 656.87 ms. Allocated memory was 96.5 MB in the beginning and 134.2 MB in the end (delta: 37.7 MB). Free memory was 63.6 MB in the beginning and 99.7 MB in the end (delta: -36.1 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 52.92 ms. Allocated memory is still 134.2 MB. Free memory was 99.7 MB in the beginning and 98.1 MB in the end (delta: 1.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 47.64 ms. Allocated memory is still 134.2 MB. Free memory was 98.1 MB in the beginning and 96.6 MB in the end (delta: 1.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 565.13 ms. Allocated memory is still 134.2 MB. Free memory was 96.6 MB in the beginning and 75.1 MB in the end (delta: 21.5 MB). Peak memory consumption was 21.0 MB. Max. memory is 16.1 GB. * TraceAbstraction took 29588.66 ms. Allocated memory was 134.2 MB in the beginning and 283.1 MB in the end (delta: 148.9 MB). Free memory was 74.6 MB in the beginning and 166.4 MB in the end (delta: -91.8 MB). Peak memory consumption was 59.1 MB. Max. memory is 16.1 GB. * Witness Printer took 53.17 ms. Allocated memory is still 283.1 MB. Free memory was 166.4 MB in the beginning and 163.8 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: 530]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 530]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 522]: all allocated memory was freed For all program executions holds that all allocated memory was freed at this location - PositiveResult [Line: 518]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 518]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 532]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 532]: 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, 16 locations, 7 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 29.5s, OverallIterations: 16, TraceHistogramMax: 5, AutomataDifference: 4.7s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 69 SDtfs, 365 SDslu, 127 SDs, 0 SdLazy, 1547 SolverSat, 179 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 529 GetRequests, 202 SyntacticMatches, 13 SemanticMatches, 314 ConstructedPredicates, 0 IntricatePredicates, 3 DeprecatedPredicates, 2267 ImplicationChecksByTransitivity, 17.4s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=23occurred in iteration=15, 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, 16 MinimizatonAttempts, 40 StatesRemovedByMinimization, 10 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.5s SatisfiabilityAnalysisTime, 6.5s InterpolantComputationTime, 280 NumberOfCodeBlocks, 280 NumberOfCodeBlocksAsserted, 37 NumberOfCheckSat, 371 ConstructedInterpolants, 18 QuantifiedInterpolants, 62129 SizeOfPredicates, 99 NumberOfNonLiveVariables, 855 ConjunctsInSsa, 248 ConjunctsInUnsatCore, 34 InterpolantComputations, 7 PerfectInterpolantSequences, 149/439 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...