./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/memsafety-ext3/derefAfterFree2.c --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_12c76463-ce8f-4319-add4-044a6e00360c/bin/utaipan/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_12c76463-ce8f-4319-add4-044a6e00360c/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_12c76463-ce8f-4319-add4-044a6e00360c/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_12c76463-ce8f-4319-add4-044a6e00360c/bin/utaipan/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/memsafety-ext3/derefAfterFree2.c -s /tmp/vcloud-vcloud-master/worker/run_dir_12c76463-ce8f-4319-add4-044a6e00360c/bin/utaipan/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_12c76463-ce8f-4319-add4-044a6e00360c/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 44834c55142a76240cb3980fc2bb6f5aeaa27c83 .............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................. Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE(valid-deref) --- Real Ultimate output --- This is Ultimate 0.2.0-a4ecdab [2020-11-22 12:51:15,705 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-11-22 12:51:15,709 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-11-22 12:51:15,808 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-11-22 12:51:15,809 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-11-22 12:51:15,812 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-11-22 12:51:15,820 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-11-22 12:51:15,823 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-11-22 12:51:15,825 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-11-22 12:51:15,829 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-11-22 12:51:15,831 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-11-22 12:51:15,835 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-11-22 12:51:15,836 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-11-22 12:51:15,847 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-11-22 12:51:15,849 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-11-22 12:51:15,853 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-11-22 12:51:15,855 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-11-22 12:51:15,858 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-11-22 12:51:15,867 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-11-22 12:51:15,873 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-11-22 12:51:15,881 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-11-22 12:51:15,884 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-11-22 12:51:15,886 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-11-22 12:51:15,888 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-11-22 12:51:15,898 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-11-22 12:51:15,898 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-11-22 12:51:15,899 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-11-22 12:51:15,902 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-11-22 12:51:15,903 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-11-22 12:51:15,904 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-11-22 12:51:15,905 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-11-22 12:51:15,907 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-11-22 12:51:15,909 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-11-22 12:51:15,911 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-11-22 12:51:15,912 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-11-22 12:51:15,913 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-11-22 12:51:15,914 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-11-22 12:51:15,918 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-11-22 12:51:15,919 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-11-22 12:51:15,920 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-11-22 12:51:15,921 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-11-22 12:51:15,925 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_12c76463-ce8f-4319-add4-044a6e00360c/bin/utaipan/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2020-11-22 12:51:15,979 INFO L113 SettingsManager]: Loading preferences was successful [2020-11-22 12:51:15,980 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-11-22 12:51:15,981 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2020-11-22 12:51:15,982 INFO L138 SettingsManager]: * User list type=DISABLED [2020-11-22 12:51:15,982 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2020-11-22 12:51:15,982 INFO L138 SettingsManager]: * Explicit value domain=true [2020-11-22 12:51:15,983 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2020-11-22 12:51:15,983 INFO L138 SettingsManager]: * Octagon Domain=false [2020-11-22 12:51:15,983 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2020-11-22 12:51:15,983 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2020-11-22 12:51:15,985 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2020-11-22 12:51:15,985 INFO L138 SettingsManager]: * Interval Domain=false [2020-11-22 12:51:15,986 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2020-11-22 12:51:15,986 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2020-11-22 12:51:15,986 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2020-11-22 12:51:15,987 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-11-22 12:51:15,988 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-11-22 12:51:15,988 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-11-22 12:51:15,988 INFO L138 SettingsManager]: * sizeof long=4 [2020-11-22 12:51:15,988 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2020-11-22 12:51:15,989 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-11-22 12:51:15,989 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-11-22 12:51:15,989 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-11-22 12:51:15,990 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2020-11-22 12:51:15,990 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2020-11-22 12:51:15,990 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2020-11-22 12:51:15,992 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-11-22 12:51:15,993 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2020-11-22 12:51:15,993 INFO L138 SettingsManager]: * sizeof long double=12 [2020-11-22 12:51:15,993 INFO L138 SettingsManager]: * Use constant arrays=true [2020-11-22 12:51:15,994 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-11-22 12:51:15,994 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-11-22 12:51:15,994 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-11-22 12:51:15,995 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-22 12:51:15,995 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-11-22 12:51:15,995 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-11-22 12:51:15,996 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2020-11-22 12:51:15,996 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-11-22 12:51:15,996 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-11-22 12:51:15,997 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-11-22 12:51:15,997 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_12c76463-ce8f-4319-add4-044a6e00360c/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_12c76463-ce8f-4319-add4-044a6e00360c/bin/utaipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 44834c55142a76240cb3980fc2bb6f5aeaa27c83 [2020-11-22 12:51:16,331 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-11-22 12:51:16,386 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-11-22 12:51:16,389 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-11-22 12:51:16,391 INFO L271 PluginConnector]: Initializing CDTParser... [2020-11-22 12:51:16,392 INFO L275 PluginConnector]: CDTParser initialized [2020-11-22 12:51:16,393 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_12c76463-ce8f-4319-add4-044a6e00360c/bin/utaipan/../../sv-benchmarks/c/memsafety-ext3/derefAfterFree2.c [2020-11-22 12:51:16,511 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_12c76463-ce8f-4319-add4-044a6e00360c/bin/utaipan/data/9a16453b9/53d7620954104c44b7bbd4fadb10fec8/FLAGbd512a35e [2020-11-22 12:51:17,172 INFO L306 CDTParser]: Found 1 translation units. [2020-11-22 12:51:17,173 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_12c76463-ce8f-4319-add4-044a6e00360c/sv-benchmarks/c/memsafety-ext3/derefAfterFree2.c [2020-11-22 12:51:17,188 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_12c76463-ce8f-4319-add4-044a6e00360c/bin/utaipan/data/9a16453b9/53d7620954104c44b7bbd4fadb10fec8/FLAGbd512a35e [2020-11-22 12:51:17,539 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_12c76463-ce8f-4319-add4-044a6e00360c/bin/utaipan/data/9a16453b9/53d7620954104c44b7bbd4fadb10fec8 [2020-11-22 12:51:17,542 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-11-22 12:51:17,544 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-11-22 12:51:17,547 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-11-22 12:51:17,547 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-11-22 12:51:17,552 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-11-22 12:51:17,554 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 12:51:17" (1/1) ... [2020-11-22 12:51:17,557 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@33b68934 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:51:17, skipping insertion in model container [2020-11-22 12:51:17,558 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 12:51:17" (1/1) ... [2020-11-22 12:51:17,569 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-11-22 12:51:17,588 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-11-22 12:51:17,798 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-22 12:51:17,839 INFO L203 MainTranslator]: Completed pre-run [2020-11-22 12:51:17,858 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-22 12:51:17,875 INFO L208 MainTranslator]: Completed translation [2020-11-22 12:51:17,875 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:51:17 WrapperNode [2020-11-22 12:51:17,876 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-11-22 12:51:17,877 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-11-22 12:51:17,877 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-11-22 12:51:17,878 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-11-22 12:51:17,887 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:51:17" (1/1) ... [2020-11-22 12:51:17,896 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:51:17" (1/1) ... [2020-11-22 12:51:17,917 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-11-22 12:51:17,918 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-11-22 12:51:17,918 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-11-22 12:51:17,918 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-11-22 12:51:17,929 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:51:17" (1/1) ... [2020-11-22 12:51:17,929 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:51:17" (1/1) ... [2020-11-22 12:51:17,931 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:51:17" (1/1) ... [2020-11-22 12:51:17,931 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:51:17" (1/1) ... [2020-11-22 12:51:17,936 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:51:17" (1/1) ... [2020-11-22 12:51:17,941 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:51:17" (1/1) ... [2020-11-22 12:51:17,942 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:51:17" (1/1) ... [2020-11-22 12:51:17,944 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-11-22 12:51:17,959 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-11-22 12:51:17,960 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-11-22 12:51:17,960 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-11-22 12:51:17,961 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:51:17" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_12c76463-ce8f-4319-add4-044a6e00360c/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 [2020-11-22 12:51:18,055 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-11-22 12:51:18,055 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-11-22 12:51:18,056 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-11-22 12:51:18,056 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-11-22 12:51:18,056 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-11-22 12:51:18,590 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-11-22 12:51:18,590 INFO L298 CfgBuilder]: Removed 5 assume(true) statements. [2020-11-22 12:51:18,592 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 12:51:18 BoogieIcfgContainer [2020-11-22 12:51:18,593 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-11-22 12:51:18,596 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-11-22 12:51:18,596 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-11-22 12:51:18,601 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-11-22 12:51:18,601 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.11 12:51:17" (1/3) ... [2020-11-22 12:51:18,602 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4de8327f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 12:51:18, skipping insertion in model container [2020-11-22 12:51:18,602 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:51:17" (2/3) ... [2020-11-22 12:51:18,603 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4de8327f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 12:51:18, skipping insertion in model container [2020-11-22 12:51:18,603 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 12:51:18" (3/3) ... [2020-11-22 12:51:18,606 INFO L111 eAbstractionObserver]: Analyzing ICFG derefAfterFree2.c [2020-11-22 12:51:18,620 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-11-22 12:51:18,626 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 6 error locations. [2020-11-22 12:51:18,641 INFO L253 AbstractCegarLoop]: Starting to check reachability of 6 error locations. [2020-11-22 12:51:18,677 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-11-22 12:51:18,678 INFO L378 AbstractCegarLoop]: Hoare is false [2020-11-22 12:51:18,678 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-11-22 12:51:18,679 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-11-22 12:51:18,679 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-11-22 12:51:18,679 INFO L382 AbstractCegarLoop]: Difference is false [2020-11-22 12:51:18,679 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-11-22 12:51:18,679 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-11-22 12:51:18,699 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states. [2020-11-22 12:51:18,710 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2020-11-22 12:51:18,710 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 12:51:18,711 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1] [2020-11-22 12:51:18,712 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr3ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr5ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr4ASSERT_VIOLATIONMEMORY_FREE]=== [2020-11-22 12:51:18,722 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 12:51:18,722 INFO L82 PathProgramCache]: Analyzing trace with hash 64636, now seen corresponding path program 1 times [2020-11-22 12:51:18,735 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 12:51:18,736 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1618272776] [2020-11-22 12:51:18,737 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 12:51:18,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 12:51:18,930 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 12:51:18,931 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1618272776] [2020-11-22 12:51:18,931 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-22 12:51:18,932 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-11-22 12:51:18,933 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [14854062] [2020-11-22 12:51:18,937 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-11-22 12:51:18,938 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 12:51:18,958 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-11-22 12:51:18,959 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-11-22 12:51:18,961 INFO L87 Difference]: Start difference. First operand 16 states. Second operand 3 states. [2020-11-22 12:51:19,041 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 12:51:19,042 INFO L93 Difference]: Finished difference Result 22 states and 23 transitions. [2020-11-22 12:51:19,042 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-11-22 12:51:19,044 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 3 [2020-11-22 12:51:19,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 12:51:19,053 INFO L225 Difference]: With dead ends: 22 [2020-11-22 12:51:19,054 INFO L226 Difference]: Without dead ends: 21 [2020-11-22 12:51:19,056 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 [2020-11-22 12:51:19,076 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-11-22 12:51:19,105 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 18. [2020-11-22 12:51:19,106 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-11-22 12:51:19,107 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 21 transitions. [2020-11-22 12:51:19,110 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 21 transitions. Word has length 3 [2020-11-22 12:51:19,110 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 12:51:19,110 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 21 transitions. [2020-11-22 12:51:19,111 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-11-22 12:51:19,111 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 21 transitions. [2020-11-22 12:51:19,111 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2020-11-22 12:51:19,111 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 12:51:19,111 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1] [2020-11-22 12:51:19,112 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-11-22 12:51:19,112 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr3ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr5ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr4ASSERT_VIOLATIONMEMORY_FREE]=== [2020-11-22 12:51:19,115 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 12:51:19,115 INFO L82 PathProgramCache]: Analyzing trace with hash 63748, now seen corresponding path program 1 times [2020-11-22 12:51:19,116 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 12:51:19,116 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [356731422] [2020-11-22 12:51:19,116 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 12:51:19,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 12:51:19,183 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 12:51:19,184 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [356731422] [2020-11-22 12:51:19,184 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-22 12:51:19,184 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2020-11-22 12:51:19,184 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1077728148] [2020-11-22 12:51:19,186 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-11-22 12:51:19,186 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 12:51:19,187 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-11-22 12:51:19,188 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-11-22 12:51:19,188 INFO L87 Difference]: Start difference. First operand 18 states and 21 transitions. Second operand 3 states. [2020-11-22 12:51:19,236 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 12:51:19,236 INFO L93 Difference]: Finished difference Result 23 states and 25 transitions. [2020-11-22 12:51:19,238 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-11-22 12:51:19,238 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 3 [2020-11-22 12:51:19,238 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 12:51:19,239 INFO L225 Difference]: With dead ends: 23 [2020-11-22 12:51:19,239 INFO L226 Difference]: Without dead ends: 23 [2020-11-22 12:51:19,240 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 [2020-11-22 12:51:19,241 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-11-22 12:51:19,244 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 20. [2020-11-22 12:51:19,244 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-11-22 12:51:19,245 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 24 transitions. [2020-11-22 12:51:19,245 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 24 transitions. Word has length 3 [2020-11-22 12:51:19,266 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 12:51:19,267 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 24 transitions. [2020-11-22 12:51:19,267 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-11-22 12:51:19,267 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 24 transitions. [2020-11-22 12:51:19,267 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2020-11-22 12:51:19,268 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 12:51:19,268 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1] [2020-11-22 12:51:19,268 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-11-22 12:51:19,269 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr3ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr5ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr4ASSERT_VIOLATIONMEMORY_FREE]=== [2020-11-22 12:51:19,270 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 12:51:19,270 INFO L82 PathProgramCache]: Analyzing trace with hash 63749, now seen corresponding path program 1 times [2020-11-22 12:51:19,271 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 12:51:19,272 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1040267049] [2020-11-22 12:51:19,277 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 12:51:19,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 12:51:19,388 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 12:51:19,389 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1040267049] [2020-11-22 12:51:19,390 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-22 12:51:19,390 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2020-11-22 12:51:19,391 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [775667535] [2020-11-22 12:51:19,391 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-11-22 12:51:19,392 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 12:51:19,393 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-11-22 12:51:19,393 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-11-22 12:51:19,393 INFO L87 Difference]: Start difference. First operand 20 states and 24 transitions. Second operand 3 states. [2020-11-22 12:51:19,454 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 12:51:19,455 INFO L93 Difference]: Finished difference Result 21 states and 24 transitions. [2020-11-22 12:51:19,456 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-11-22 12:51:19,456 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 3 [2020-11-22 12:51:19,456 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 12:51:19,457 INFO L225 Difference]: With dead ends: 21 [2020-11-22 12:51:19,457 INFO L226 Difference]: Without dead ends: 21 [2020-11-22 12:51:19,458 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 [2020-11-22 12:51:19,458 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-11-22 12:51:19,461 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 20. [2020-11-22 12:51:19,461 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-11-22 12:51:19,463 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 23 transitions. [2020-11-22 12:51:19,463 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 23 transitions. Word has length 3 [2020-11-22 12:51:19,463 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 12:51:19,463 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 23 transitions. [2020-11-22 12:51:19,464 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-11-22 12:51:19,464 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 23 transitions. [2020-11-22 12:51:19,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2020-11-22 12:51:19,465 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 12:51:19,465 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2020-11-22 12:51:19,465 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-11-22 12:51:19,466 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr3ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr5ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr4ASSERT_VIOLATIONMEMORY_FREE]=== [2020-11-22 12:51:19,466 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 12:51:19,467 INFO L82 PathProgramCache]: Analyzing trace with hash -1257107777, now seen corresponding path program 1 times [2020-11-22 12:51:19,467 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 12:51:19,467 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1068010296] [2020-11-22 12:51:19,468 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 12:51:19,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 12:51:19,548 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 12:51:19,548 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1068010296] [2020-11-22 12:51:19,549 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1351562834] [2020-11-22 12:51:19,549 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_12c76463-ce8f-4319-add4-044a6e00360c/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 [2020-11-22 12:51:19,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 12:51:19,598 INFO L263 TraceCheckSpWp]: Trace formula consists of 35 conjuncts, 3 conjunts are in the unsatisfiable core [2020-11-22 12:51:19,603 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-22 12:51:19,665 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 12:51:19,665 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-22 12:51:19,754 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 12:51:19,754 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1001214177] [2020-11-22 12:51:19,789 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2020-11-22 12:51:19,790 INFO L166 IcfgInterpreter]: Building call graph [2020-11-22 12:51:19,796 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-22 12:51:19,804 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-22 12:51:19,806 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-22 12:51:20,721 INFO L180 IcfgInterpreter]: Interpretation finished [2020-11-22 12:51:21,155 WARN L193 SmtUtils]: Spent 406.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 44 [2020-11-22 12:51:21,399 WARN L193 SmtUtils]: Spent 212.00 ms on a formula simplification. DAG size of input: 69 DAG size of output: 60 [2020-11-22 12:51:21,874 WARN L193 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 73 DAG size of output: 41 [2020-11-22 12:51:21,877 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-11-22 12:51:21,877 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-22 12:51:21,877 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2020-11-22 12:51:21,878 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1404110707] [2020-11-22 12:51:21,878 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-11-22 12:51:21,878 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 12:51:21,879 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-11-22 12:51:21,880 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=114, Unknown=0, NotChecked=0, Total=156 [2020-11-22 12:51:21,880 INFO L87 Difference]: Start difference. First operand 20 states and 23 transitions. Second operand 7 states. [2020-11-22 12:51:21,973 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 12:51:21,973 INFO L93 Difference]: Finished difference Result 32 states and 35 transitions. [2020-11-22 12:51:21,973 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-11-22 12:51:21,973 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 7 [2020-11-22 12:51:21,974 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 12:51:21,974 INFO L225 Difference]: With dead ends: 32 [2020-11-22 12:51:21,974 INFO L226 Difference]: Without dead ends: 32 [2020-11-22 12:51:21,975 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=42, Invalid=114, Unknown=0, NotChecked=0, Total=156 [2020-11-22 12:51:21,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-11-22 12:51:21,979 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-11-22 12:51:21,980 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-11-22 12:51:21,981 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 35 transitions. [2020-11-22 12:51:21,981 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 35 transitions. Word has length 7 [2020-11-22 12:51:21,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 12:51:21,981 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 35 transitions. [2020-11-22 12:51:21,981 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-11-22 12:51:21,982 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 35 transitions. [2020-11-22 12:51:21,982 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2020-11-22 12:51:21,982 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 12:51:21,982 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1] [2020-11-22 12:51:22,199 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3 [2020-11-22 12:51:22,199 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr3ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr5ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr4ASSERT_VIOLATIONMEMORY_FREE]=== [2020-11-22 12:51:22,200 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 12:51:22,200 INFO L82 PathProgramCache]: Analyzing trace with hash -1257108664, now seen corresponding path program 1 times [2020-11-22 12:51:22,200 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 12:51:22,200 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1266823012] [2020-11-22 12:51:22,200 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 12:51:22,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 12:51:22,313 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 12:51:22,313 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1266823012] [2020-11-22 12:51:22,313 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1563341729] [2020-11-22 12:51:22,314 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_12c76463-ce8f-4319-add4-044a6e00360c/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 [2020-11-22 12:51:22,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 12:51:22,355 INFO L263 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 12 conjunts are in the unsatisfiable core [2020-11-22 12:51:22,357 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-22 12:51:22,448 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 12:51:22,448 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-22 12:51:22,501 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 12:51:22,502 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1632704623] [2020-11-22 12:51:22,505 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2020-11-22 12:51:22,505 INFO L166 IcfgInterpreter]: Building call graph [2020-11-22 12:51:22,505 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-22 12:51:22,506 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-22 12:51:22,506 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-22 12:51:22,881 INFO L180 IcfgInterpreter]: Interpretation finished [2020-11-22 12:51:23,252 WARN L193 SmtUtils]: Spent 245.00 ms on a formula simplification. DAG size of input: 69 DAG size of output: 60 [2020-11-22 12:51:23,573 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-11-22 12:51:23,573 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-22 12:51:23,574 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [2, 2, 2] total 5 [2020-11-22 12:51:23,574 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1087193866] [2020-11-22 12:51:23,574 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-11-22 12:51:23,575 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 12:51:23,575 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-11-22 12:51:23,576 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2020-11-22 12:51:23,576 INFO L87 Difference]: Start difference. First operand 30 states and 35 transitions. Second operand 7 states. [2020-11-22 12:51:23,740 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 12:51:23,740 INFO L93 Difference]: Finished difference Result 40 states and 43 transitions. [2020-11-22 12:51:23,740 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-11-22 12:51:23,741 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 7 [2020-11-22 12:51:23,741 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 12:51:23,743 INFO L225 Difference]: With dead ends: 40 [2020-11-22 12:51:23,743 INFO L226 Difference]: Without dead ends: 40 [2020-11-22 12:51:23,744 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 10 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=42, Invalid=114, Unknown=0, NotChecked=0, Total=156 [2020-11-22 12:51:23,744 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-11-22 12:51:23,749 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 37. [2020-11-22 12:51:23,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-11-22 12:51:23,750 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 43 transitions. [2020-11-22 12:51:23,753 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 43 transitions. Word has length 7 [2020-11-22 12:51:23,753 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 12:51:23,753 INFO L481 AbstractCegarLoop]: Abstraction has 37 states and 43 transitions. [2020-11-22 12:51:23,753 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-11-22 12:51:23,760 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 43 transitions. [2020-11-22 12:51:23,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-11-22 12:51:23,761 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 12:51:23,761 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1] [2020-11-22 12:51:23,983 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2020-11-22 12:51:23,983 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr3ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr5ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr4ASSERT_VIOLATIONMEMORY_FREE]=== [2020-11-22 12:51:23,983 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 12:51:23,983 INFO L82 PathProgramCache]: Analyzing trace with hash -1518770230, now seen corresponding path program 1 times [2020-11-22 12:51:23,984 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 12:51:23,984 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1355246807] [2020-11-22 12:51:23,984 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 12:51:23,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 12:51:24,049 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 12:51:24,050 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1355246807] [2020-11-22 12:51:24,050 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [958938271] [2020-11-22 12:51:24,050 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_12c76463-ce8f-4319-add4-044a6e00360c/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 [2020-11-22 12:51:24,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 12:51:24,095 INFO L263 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 4 conjunts are in the unsatisfiable core [2020-11-22 12:51:24,096 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-22 12:51:24,115 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 12:51:24,116 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-22 12:51:24,149 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 12:51:24,150 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [109256864] [2020-11-22 12:51:24,153 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2020-11-22 12:51:24,153 INFO L166 IcfgInterpreter]: Building call graph [2020-11-22 12:51:24,153 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-22 12:51:24,154 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-22 12:51:24,154 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-22 12:51:24,476 INFO L180 IcfgInterpreter]: Interpretation finished [2020-11-22 12:51:24,736 WARN L193 SmtUtils]: Spent 238.00 ms on a formula simplification. DAG size of input: 69 DAG size of output: 60 [2020-11-22 12:51:25,149 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 3 imperfect interpolant sequences. [2020-11-22 12:51:25,149 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [4, 4, 4] total 12 [2020-11-22 12:51:25,150 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2082769578] [2020-11-22 12:51:25,150 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-11-22 12:51:25,151 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 12:51:25,151 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-11-22 12:51:25,151 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-11-22 12:51:25,152 INFO L87 Difference]: Start difference. First operand 37 states and 43 transitions. Second operand 7 states. [2020-11-22 12:51:25,395 WARN L193 SmtUtils]: Spent 203.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 59 [2020-11-22 12:51:25,620 WARN L193 SmtUtils]: Spent 198.00 ms on a formula simplification. DAG size of input: 71 DAG size of output: 62 [2020-11-22 12:51:25,752 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 69 DAG size of output: 38 [2020-11-22 12:51:25,856 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 12:51:25,856 INFO L93 Difference]: Finished difference Result 43 states and 48 transitions. [2020-11-22 12:51:25,857 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-11-22 12:51:25,858 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 13 [2020-11-22 12:51:25,858 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 12:51:25,859 INFO L225 Difference]: With dead ends: 43 [2020-11-22 12:51:25,859 INFO L226 Difference]: Without dead ends: 43 [2020-11-22 12:51:25,860 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 28 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=63, Invalid=177, Unknown=0, NotChecked=0, Total=240 [2020-11-22 12:51:25,860 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-11-22 12:51:25,866 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 36. [2020-11-22 12:51:25,866 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-11-22 12:51:25,867 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 41 transitions. [2020-11-22 12:51:25,867 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 41 transitions. Word has length 13 [2020-11-22 12:51:25,868 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 12:51:25,868 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 41 transitions. [2020-11-22 12:51:25,868 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-11-22 12:51:25,868 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 41 transitions. [2020-11-22 12:51:25,869 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-11-22 12:51:25,869 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 12:51:25,869 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1] [2020-11-22 12:51:26,069 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2020-11-22 12:51:26,070 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr3ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr5ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr4ASSERT_VIOLATIONMEMORY_FREE]=== [2020-11-22 12:51:26,070 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 12:51:26,070 INFO L82 PathProgramCache]: Analyzing trace with hash 162763176, now seen corresponding path program 1 times [2020-11-22 12:51:26,070 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 12:51:26,071 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1189318848] [2020-11-22 12:51:26,071 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 12:51:26,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 12:51:26,128 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 12:51:26,128 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1189318848] [2020-11-22 12:51:26,128 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [950624292] [2020-11-22 12:51:26,129 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_12c76463-ce8f-4319-add4-044a6e00360c/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 [2020-11-22 12:51:26,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 12:51:26,179 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 4 conjunts are in the unsatisfiable core [2020-11-22 12:51:26,180 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-22 12:51:26,205 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 12:51:26,205 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-22 12:51:26,251 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 12:51:26,251 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1388186632] [2020-11-22 12:51:26,254 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2020-11-22 12:51:26,254 INFO L166 IcfgInterpreter]: Building call graph [2020-11-22 12:51:26,254 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-22 12:51:26,254 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-22 12:51:26,255 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-22 12:51:26,531 INFO L180 IcfgInterpreter]: Interpretation finished [2020-11-22 12:51:26,872 WARN L193 SmtUtils]: Spent 213.00 ms on a formula simplification. DAG size of input: 69 DAG size of output: 60 [2020-11-22 12:51:27,328 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-11-22 12:51:27,328 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-22 12:51:27,329 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2020-11-22 12:51:27,329 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [169618646] [2020-11-22 12:51:27,329 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-11-22 12:51:27,329 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 12:51:27,330 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-11-22 12:51:27,330 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=133, Unknown=0, NotChecked=0, Total=182 [2020-11-22 12:51:27,331 INFO L87 Difference]: Start difference. First operand 36 states and 41 transitions. Second operand 8 states. [2020-11-22 12:51:27,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 12:51:27,394 INFO L93 Difference]: Finished difference Result 37 states and 39 transitions. [2020-11-22 12:51:27,394 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-11-22 12:51:27,394 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 14 [2020-11-22 12:51:27,395 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 12:51:27,395 INFO L225 Difference]: With dead ends: 37 [2020-11-22 12:51:27,396 INFO L226 Difference]: Without dead ends: 37 [2020-11-22 12:51:27,396 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 30 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=49, Invalid=133, Unknown=0, NotChecked=0, Total=182 [2020-11-22 12:51:27,397 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-11-22 12:51:27,400 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2020-11-22 12:51:27,400 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-11-22 12:51:27,401 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 38 transitions. [2020-11-22 12:51:27,402 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 38 transitions. Word has length 14 [2020-11-22 12:51:27,402 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 12:51:27,402 INFO L481 AbstractCegarLoop]: Abstraction has 35 states and 38 transitions. [2020-11-22 12:51:27,402 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-11-22 12:51:27,402 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 38 transitions. [2020-11-22 12:51:27,403 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-11-22 12:51:27,403 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 12:51:27,403 INFO L422 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 1, 1] [2020-11-22 12:51:27,615 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable70,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-22 12:51:27,615 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr3ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr5ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr4ASSERT_VIOLATIONMEMORY_FREE]=== [2020-11-22 12:51:27,615 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 12:51:27,616 INFO L82 PathProgramCache]: Analyzing trace with hash 1930635537, now seen corresponding path program 2 times [2020-11-22 12:51:27,616 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 12:51:27,616 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2044158463] [2020-11-22 12:51:27,616 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 12:51:27,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 12:51:27,819 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 12:51:27,819 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2044158463] [2020-11-22 12:51:27,820 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [425467413] [2020-11-22 12:51:27,821 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_12c76463-ce8f-4319-add4-044a6e00360c/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 [2020-11-22 12:51:27,873 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2020-11-22 12:51:27,873 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-22 12:51:27,874 INFO L263 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 9 conjunts are in the unsatisfiable core [2020-11-22 12:51:27,877 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-22 12:51:28,029 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-11-22 12:51:28,029 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-22 12:51:28,201 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-11-22 12:51:28,202 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2020-11-22 12:51:28,202 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [5, 4] total 13 [2020-11-22 12:51:28,202 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [122848449] [2020-11-22 12:51:28,203 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-11-22 12:51:28,203 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 12:51:28,203 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-11-22 12:51:28,204 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=151, Unknown=0, NotChecked=0, Total=210 [2020-11-22 12:51:28,204 INFO L87 Difference]: Start difference. First operand 35 states and 38 transitions. Second operand 6 states. [2020-11-22 12:51:28,264 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 12:51:28,264 INFO L93 Difference]: Finished difference Result 34 states and 35 transitions. [2020-11-22 12:51:28,264 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-11-22 12:51:28,264 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2020-11-22 12:51:28,265 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 12:51:28,265 INFO L225 Difference]: With dead ends: 34 [2020-11-22 12:51:28,265 INFO L226 Difference]: Without dead ends: 34 [2020-11-22 12:51:28,266 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=59, Invalid=151, Unknown=0, NotChecked=0, Total=210 [2020-11-22 12:51:28,266 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-11-22 12:51:28,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-11-22 12:51:28,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-11-22 12:51:28,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 35 transitions. [2020-11-22 12:51:28,270 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 35 transitions. Word has length 19 [2020-11-22 12:51:28,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 12:51:28,270 INFO L481 AbstractCegarLoop]: Abstraction has 34 states and 35 transitions. [2020-11-22 12:51:28,270 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-11-22 12:51:28,271 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 35 transitions. [2020-11-22 12:51:28,271 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-11-22 12:51:28,271 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 12:51:28,271 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 1, 1, 1] [2020-11-22 12:51:28,486 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable91,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-22 12:51:28,487 INFO L429 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr3ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr5ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr4ASSERT_VIOLATIONMEMORY_FREE]=== [2020-11-22 12:51:28,487 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 12:51:28,487 INFO L82 PathProgramCache]: Analyzing trace with hash -197830453, now seen corresponding path program 2 times [2020-11-22 12:51:28,487 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 12:51:28,487 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1712033665] [2020-11-22 12:51:28,488 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 12:51:28,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 12:51:28,592 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 12:51:28,592 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1712033665] [2020-11-22 12:51:28,593 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [332415339] [2020-11-22 12:51:28,593 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_12c76463-ce8f-4319-add4-044a6e00360c/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 [2020-11-22 12:51:28,633 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2020-11-22 12:51:28,633 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-22 12:51:28,634 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 7 conjunts are in the unsatisfiable core [2020-11-22 12:51:28,636 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-22 12:51:28,693 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 12:51:28,694 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-22 12:51:28,842 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 12:51:28,842 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1892230253] [2020-11-22 12:51:28,846 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2020-11-22 12:51:28,846 INFO L166 IcfgInterpreter]: Building call graph [2020-11-22 12:51:28,846 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-22 12:51:28,846 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-22 12:51:28,846 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-22 12:51:29,130 INFO L180 IcfgInterpreter]: Interpretation finished [2020-11-22 12:51:29,306 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 44 [2020-11-22 12:51:29,560 WARN L193 SmtUtils]: Spent 221.00 ms on a formula simplification. DAG size of input: 69 DAG size of output: 60 [2020-11-22 12:51:29,914 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 73 DAG size of output: 41 [2020-11-22 12:51:29,915 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-11-22 12:51:29,915 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-22 12:51:29,915 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 12 [2020-11-22 12:51:29,915 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2099102128] [2020-11-22 12:51:29,916 INFO L461 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-11-22 12:51:29,916 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 12:51:29,916 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-11-22 12:51:29,917 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=243, Unknown=0, NotChecked=0, Total=342 [2020-11-22 12:51:29,917 INFO L87 Difference]: Start difference. First operand 34 states and 35 transitions. Second operand 13 states. [2020-11-22 12:51:30,106 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 12:51:30,107 INFO L93 Difference]: Finished difference Result 49 states and 54 transitions. [2020-11-22 12:51:30,107 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-11-22 12:51:30,107 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 23 [2020-11-22 12:51:30,108 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 12:51:30,108 INFO L225 Difference]: With dead ends: 49 [2020-11-22 12:51:30,108 INFO L226 Difference]: Without dead ends: 49 [2020-11-22 12:51:30,109 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 56 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 113 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=99, Invalid=243, Unknown=0, NotChecked=0, Total=342 [2020-11-22 12:51:30,109 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-11-22 12:51:30,113 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-11-22 12:51:30,113 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-11-22 12:51:30,114 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 54 transitions. [2020-11-22 12:51:30,114 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 54 transitions. Word has length 23 [2020-11-22 12:51:30,114 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 12:51:30,114 INFO L481 AbstractCegarLoop]: Abstraction has 49 states and 54 transitions. [2020-11-22 12:51:30,115 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-11-22 12:51:30,115 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 54 transitions. [2020-11-22 12:51:30,115 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-11-22 12:51:30,116 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 12:51:30,116 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 1, 1, 1, 1] [2020-11-22 12:51:30,316 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable92,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-22 12:51:30,317 INFO L429 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr3ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr5ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr4ASSERT_VIOLATIONMEMORY_FREE]=== [2020-11-22 12:51:30,317 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 12:51:30,317 INFO L82 PathProgramCache]: Analyzing trace with hash -898363457, now seen corresponding path program 2 times [2020-11-22 12:51:30,317 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 12:51:30,317 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [906556365] [2020-11-22 12:51:30,317 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 12:51:30,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 12:51:30,375 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2020-11-22 12:51:30,375 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [906556365] [2020-11-22 12:51:30,375 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-22 12:51:30,375 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2020-11-22 12:51:30,375 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2054373163] [2020-11-22 12:51:30,376 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-11-22 12:51:30,376 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 12:51:30,376 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-11-22 12:51:30,377 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-11-22 12:51:30,377 INFO L87 Difference]: Start difference. First operand 49 states and 54 transitions. Second operand 3 states. [2020-11-22 12:51:30,385 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 12:51:30,385 INFO L93 Difference]: Finished difference Result 48 states and 53 transitions. [2020-11-22 12:51:30,385 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-11-22 12:51:30,385 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 26 [2020-11-22 12:51:30,386 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 12:51:30,386 INFO L225 Difference]: With dead ends: 48 [2020-11-22 12:51:30,386 INFO L226 Difference]: Without dead ends: 48 [2020-11-22 12:51:30,387 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 [2020-11-22 12:51:30,387 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-11-22 12:51:30,390 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-11-22 12:51:30,390 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-11-22 12:51:30,391 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 53 transitions. [2020-11-22 12:51:30,391 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 53 transitions. Word has length 26 [2020-11-22 12:51:30,392 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 12:51:30,392 INFO L481 AbstractCegarLoop]: Abstraction has 48 states and 53 transitions. [2020-11-22 12:51:30,392 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-11-22 12:51:30,392 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 53 transitions. [2020-11-22 12:51:30,393 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-11-22 12:51:30,393 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 12:51:30,393 INFO L422 BasicCegarLoop]: trace histogram [7, 6, 6, 5, 1, 1, 1, 1, 1, 1] [2020-11-22 12:51:30,393 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable117 [2020-11-22 12:51:30,394 INFO L429 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr3ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr5ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr4ASSERT_VIOLATIONMEMORY_FREE]=== [2020-11-22 12:51:30,394 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 12:51:30,394 INFO L82 PathProgramCache]: Analyzing trace with hash 1316000454, now seen corresponding path program 1 times [2020-11-22 12:51:30,394 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 12:51:30,394 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1751846079] [2020-11-22 12:51:30,395 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 12:51:30,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-22 12:51:30,413 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-22 12:51:30,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-22 12:51:30,438 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-22 12:51:30,480 INFO L173 FreeRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2020-11-22 12:51:30,480 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-11-22 12:51:30,481 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable118 [2020-11-22 12:51:30,519 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.11 12:51:30 BoogieIcfgContainer [2020-11-22 12:51:30,519 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-11-22 12:51:30,519 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-11-22 12:51:30,519 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-11-22 12:51:30,520 INFO L275 PluginConnector]: Witness Printer initialized [2020-11-22 12:51:30,520 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 12:51:18" (3/4) ... [2020-11-22 12:51:30,522 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2020-11-22 12:51:30,573 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_12c76463-ce8f-4319-add4-044a6e00360c/bin/utaipan/witness.graphml [2020-11-22 12:51:30,573 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-11-22 12:51:30,574 INFO L168 Benchmark]: Toolchain (without parser) took 13029.83 ms. Allocated memory was 96.5 MB in the beginning and 123.7 MB in the end (delta: 27.3 MB). Free memory was 63.0 MB in the beginning and 76.2 MB in the end (delta: -13.2 MB). Peak memory consumption was 15.2 MB. Max. memory is 16.1 GB. [2020-11-22 12:51:30,575 INFO L168 Benchmark]: CDTParser took 0.40 ms. Allocated memory is still 96.5 MB. Free memory was 68.4 MB in the beginning and 68.3 MB in the end (delta: 26.8 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-22 12:51:30,575 INFO L168 Benchmark]: CACSL2BoogieTranslator took 329.48 ms. Allocated memory is still 96.5 MB. Free memory was 62.9 MB in the beginning and 73.6 MB in the end (delta: -10.7 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2020-11-22 12:51:30,575 INFO L168 Benchmark]: Boogie Procedure Inliner took 39.81 ms. Allocated memory is still 96.5 MB. Free memory was 73.6 MB in the beginning and 72.2 MB in the end (delta: 1.3 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-22 12:51:30,576 INFO L168 Benchmark]: Boogie Preprocessor took 40.53 ms. Allocated memory is still 96.5 MB. Free memory was 72.2 MB in the beginning and 71.1 MB in the end (delta: 1.2 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-22 12:51:30,576 INFO L168 Benchmark]: RCFGBuilder took 633.42 ms. Allocated memory is still 96.5 MB. Free memory was 71.1 MB in the beginning and 58.1 MB in the end (delta: 13.0 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. [2020-11-22 12:51:30,577 INFO L168 Benchmark]: TraceAbstraction took 11922.77 ms. Allocated memory was 96.5 MB in the beginning and 123.7 MB in the end (delta: 27.3 MB). Free memory was 57.6 MB in the beginning and 78.3 MB in the end (delta: -20.7 MB). Peak memory consumption was 9.4 MB. Max. memory is 16.1 GB. [2020-11-22 12:51:30,577 INFO L168 Benchmark]: Witness Printer took 54.01 ms. Allocated memory is still 123.7 MB. Free memory was 78.3 MB in the beginning and 76.2 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-22 12:51:30,579 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.40 ms. Allocated memory is still 96.5 MB. Free memory was 68.4 MB in the beginning and 68.3 MB in the end (delta: 26.8 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 329.48 ms. Allocated memory is still 96.5 MB. Free memory was 62.9 MB in the beginning and 73.6 MB in the end (delta: -10.7 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 39.81 ms. Allocated memory is still 96.5 MB. Free memory was 73.6 MB in the beginning and 72.2 MB in the end (delta: 1.3 MB). There was no memory consumed. Max. memory is 16.1 GB. * Boogie Preprocessor took 40.53 ms. Allocated memory is still 96.5 MB. Free memory was 72.2 MB in the beginning and 71.1 MB in the end (delta: 1.2 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 633.42 ms. Allocated memory is still 96.5 MB. Free memory was 71.1 MB in the beginning and 58.1 MB in the end (delta: 13.0 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. * TraceAbstraction took 11922.77 ms. Allocated memory was 96.5 MB in the beginning and 123.7 MB in the end (delta: 27.3 MB). Free memory was 57.6 MB in the beginning and 78.3 MB in the end (delta: -20.7 MB). Peak memory consumption was 9.4 MB. Max. memory is 16.1 GB. * Witness Printer took 54.01 ms. Allocated memory is still 123.7 MB. Free memory was 78.3 MB in the beginning and 76.2 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 9]: pointer dereference may fail pointer dereference may fail We found a FailurePath: [L6] int* p = malloc(10 * sizeof(int)); [L8] int i = 0; [L8] COND TRUE i < 10 [L9] p[i] = 1 [L10] COND FALSE !(i == 5) [L8] i++ [L8] COND TRUE i < 10 [L9] p[i] = 1 [L10] COND FALSE !(i == 5) [L8] i++ [L8] COND TRUE i < 10 [L9] p[i] = 1 [L10] COND FALSE !(i == 5) [L8] i++ [L8] COND TRUE i < 10 [L9] p[i] = 1 [L10] COND FALSE !(i == 5) [L8] i++ [L8] COND TRUE i < 10 [L9] p[i] = 1 [L10] COND FALSE !(i == 5) [L8] i++ [L8] COND TRUE i < 10 [L9] p[i] = 1 [L10] COND TRUE i == 5 [L11] free(p) [L11] free(p) [L11] free(p) [L8] i++ [L8] COND TRUE i < 10 [L9] p[i] = 1 - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 16 locations, 6 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 11.8s, OverallIterations: 11, TraceHistogramMax: 7, AutomataDifference: 1.5s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 74 SDtfs, 194 SDslu, 68 SDs, 0 SdLazy, 276 SolverSat, 36 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.6s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 252 GetRequests, 164 SyntacticMatches, 6 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 331 ImplicationChecksByTransitivity, 5.7s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=49occurred in iteration=9, 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, 10 MinimizatonAttempts, 21 StatesRemovedByMinimization, 7 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 1.6s InterpolantComputationTime, 231 NumberOfCodeBlocks, 219 NumberOfCodeBlocksAsserted, 23 NumberOfCheckSat, 262 ConstructedInterpolants, 0 QuantifiedInterpolants, 29208 SizeOfPredicates, 9 NumberOfNonLiveVariables, 272 ConjunctsInSsa, 39 ConjunctsInUnsatCore, 22 InterpolantComputations, 5 PerfectInterpolantSequences, 105/355 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: OVERALL_TIME[ms]: 323, ICFG_INTERPRETER_ENTERED_PROCEDURES: 1, DAG_INTERPRETER_EARLY_EXIT_QUERIES_NONTRIVIAL: 6, DAG_INTERPRETER_EARLY_EXITS: 0, TOOLS_POST_APPLICATIONS: 19, TOOLS_POST_TIME[ms]: 184, TOOLS_POST_CALL_APPLICATIONS: 0, TOOLS_POST_CALL_TIME[ms]: 0, TOOLS_POST_RETURN_APPLICATIONS: 0, TOOLS_POST_RETURN_TIME[ms]: 0, TOOLS_QUANTIFIERELIM_APPLICATIONS: 19, TOOLS_QUANTIFIERELIM_TIME[ms]: 178, TOOLS_QUANTIFIERELIM_MAX_TIME[ms]: 84, FLUID_QUERY_TIME[ms]: 1, FLUID_QUERIES: 34, FLUID_YES_ANSWERS: 0, DOMAIN_JOIN_APPLICATIONS: 1, DOMAIN_JOIN_TIME[ms]: 29, DOMAIN_ALPHA_APPLICATIONS: 0, DOMAIN_ALPHA_TIME[ms]: 0, DOMAIN_WIDEN_APPLICATIONS: 2, DOMAIN_WIDEN_TIME[ms]: 76, DOMAIN_ISSUBSETEQ_APPLICATIONS: 3, DOMAIN_ISSUBSETEQ_TIME[ms]: 12, DOMAIN_ISBOTTOM_APPLICATIONS: 6, DOMAIN_ISBOTTOM_TIME[ms]: 10, LOOP_SUMMARIZER_APPLICATIONS: 1, LOOP_SUMMARIZER_CACHE_MISSES: 1, LOOP_SUMMARIZER_OVERALL_TIME[ms]: 217, LOOP_SUMMARIZER_NEW_COMPUTATION_TIME[ms]: 217, LOOP_SUMMARIZER_FIXPOINT_ITERATIONS: 3, CALL_SUMMARIZER_APPLICATIONS: 0, CALL_SUMMARIZER_CACHE_MISSES: 0, CALL_SUMMARIZER_OVERALL_TIME[ms]: 0, CALL_SUMMARIZER_NEW_COMPUTATION_TIME[ms]: 0, PROCEDURE_GRAPH_BUILDER_TIME[ms]: 0, PATH_EXPR_TIME[ms]: 0, REGEX_TO_DAG_TIME[ms]: 0, DAG_COMPRESSION_TIME[ms]: 6, DAG_COMPRESSION_PROCESSED_NODES: 49, DAG_COMPRESSION_RETAINED_NODES: 24, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...