./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/array-memsafety/cstrchr_unsafe.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version a4ecdabc Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_9c576bdf-6c7a-4d08-810f-30ed39d84206/bin/utaipan/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_9c576bdf-6c7a-4d08-810f-30ed39d84206/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_9c576bdf-6c7a-4d08-810f-30ed39d84206/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_9c576bdf-6c7a-4d08-810f-30ed39d84206/bin/utaipan/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/cstrchr_unsafe.i -s /tmp/vcloud-vcloud-master/worker/run_dir_9c576bdf-6c7a-4d08-810f-30ed39d84206/bin/utaipan/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_9c576bdf-6c7a-4d08-810f-30ed39d84206/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 efc45e5708d4a9b560055cd5abf7b168f9024833 ................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 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 12:56:50,278 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-11-22 12:56:50,281 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-11-22 12:56:50,343 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-11-22 12:56:50,344 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-11-22 12:56:50,348 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-11-22 12:56:50,351 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-11-22 12:56:50,374 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-11-22 12:56:50,377 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-11-22 12:56:50,378 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-11-22 12:56:50,379 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-11-22 12:56:50,381 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-11-22 12:56:50,381 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-11-22 12:56:50,383 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-11-22 12:56:50,384 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-11-22 12:56:50,386 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-11-22 12:56:50,387 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-11-22 12:56:50,388 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-11-22 12:56:50,391 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-11-22 12:56:50,393 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-11-22 12:56:50,395 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-11-22 12:56:50,396 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-11-22 12:56:50,398 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-11-22 12:56:50,399 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-11-22 12:56:50,403 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-11-22 12:56:50,403 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-11-22 12:56:50,404 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-11-22 12:56:50,405 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-11-22 12:56:50,405 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-11-22 12:56:50,407 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-11-22 12:56:50,407 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-11-22 12:56:50,408 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-11-22 12:56:50,409 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-11-22 12:56:50,410 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-11-22 12:56:50,411 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-11-22 12:56:50,412 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-11-22 12:56:50,413 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-11-22 12:56:50,413 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-11-22 12:56:50,414 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-11-22 12:56:50,415 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-11-22 12:56:50,416 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-11-22 12:56:50,417 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_9c576bdf-6c7a-4d08-810f-30ed39d84206/bin/utaipan/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2020-11-22 12:56:50,441 INFO L113 SettingsManager]: Loading preferences was successful [2020-11-22 12:56:50,441 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-11-22 12:56:50,442 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2020-11-22 12:56:50,442 INFO L138 SettingsManager]: * User list type=DISABLED [2020-11-22 12:56:50,443 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2020-11-22 12:56:50,443 INFO L138 SettingsManager]: * Explicit value domain=true [2020-11-22 12:56:50,443 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2020-11-22 12:56:50,444 INFO L138 SettingsManager]: * Octagon Domain=false [2020-11-22 12:56:50,444 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2020-11-22 12:56:50,444 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2020-11-22 12:56:50,444 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2020-11-22 12:56:50,445 INFO L138 SettingsManager]: * Interval Domain=false [2020-11-22 12:56:50,445 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2020-11-22 12:56:50,445 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2020-11-22 12:56:50,446 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2020-11-22 12:56:50,447 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-11-22 12:56:50,447 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-11-22 12:56:50,447 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-11-22 12:56:50,448 INFO L138 SettingsManager]: * sizeof long=4 [2020-11-22 12:56:50,448 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2020-11-22 12:56:50,448 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-11-22 12:56:50,448 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-11-22 12:56:50,449 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-11-22 12:56:50,449 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2020-11-22 12:56:50,449 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2020-11-22 12:56:50,450 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2020-11-22 12:56:50,450 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-11-22 12:56:50,450 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2020-11-22 12:56:50,451 INFO L138 SettingsManager]: * sizeof long double=12 [2020-11-22 12:56:50,451 INFO L138 SettingsManager]: * Use constant arrays=true [2020-11-22 12:56:50,451 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-11-22 12:56:50,452 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-11-22 12:56:50,452 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-11-22 12:56:50,452 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-22 12:56:50,453 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-11-22 12:56:50,453 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-11-22 12:56:50,453 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2020-11-22 12:56:50,454 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-11-22 12:56:50,454 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-11-22 12:56:50,454 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-11-22 12:56:50,455 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_9c576bdf-6c7a-4d08-810f-30ed39d84206/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_9c576bdf-6c7a-4d08-810f-30ed39d84206/bin/utaipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> efc45e5708d4a9b560055cd5abf7b168f9024833 [2020-11-22 12:56:50,701 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-11-22 12:56:50,734 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-11-22 12:56:50,736 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-11-22 12:56:50,738 INFO L271 PluginConnector]: Initializing CDTParser... [2020-11-22 12:56:50,739 INFO L275 PluginConnector]: CDTParser initialized [2020-11-22 12:56:50,740 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_9c576bdf-6c7a-4d08-810f-30ed39d84206/bin/utaipan/../../sv-benchmarks/c/array-memsafety/cstrchr_unsafe.i [2020-11-22 12:56:50,812 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_9c576bdf-6c7a-4d08-810f-30ed39d84206/bin/utaipan/data/ed5f4cf4e/85aff3e38c824548992cd0d3ac0b9c7a/FLAG7116d4a58 [2020-11-22 12:56:51,434 INFO L306 CDTParser]: Found 1 translation units. [2020-11-22 12:56:51,435 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_9c576bdf-6c7a-4d08-810f-30ed39d84206/sv-benchmarks/c/array-memsafety/cstrchr_unsafe.i [2020-11-22 12:56:51,451 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_9c576bdf-6c7a-4d08-810f-30ed39d84206/bin/utaipan/data/ed5f4cf4e/85aff3e38c824548992cd0d3ac0b9c7a/FLAG7116d4a58 [2020-11-22 12:56:51,712 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_9c576bdf-6c7a-4d08-810f-30ed39d84206/bin/utaipan/data/ed5f4cf4e/85aff3e38c824548992cd0d3ac0b9c7a [2020-11-22 12:56:51,714 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-11-22 12:56:51,716 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-11-22 12:56:51,718 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-11-22 12:56:51,718 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-11-22 12:56:51,722 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-11-22 12:56:51,723 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 12:56:51" (1/1) ... [2020-11-22 12:56:51,725 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@76be2228 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:56:51, skipping insertion in model container [2020-11-22 12:56:51,725 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 12:56:51" (1/1) ... [2020-11-22 12:56:51,733 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-11-22 12:56:51,770 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-11-22 12:56:52,059 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-22 12:56:52,065 INFO L203 MainTranslator]: Completed pre-run [2020-11-22 12:56:52,140 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-22 12:56:52,202 INFO L208 MainTranslator]: Completed translation [2020-11-22 12:56:52,203 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:56:52 WrapperNode [2020-11-22 12:56:52,204 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-11-22 12:56:52,205 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-11-22 12:56:52,205 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-11-22 12:56:52,205 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-11-22 12:56:52,213 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:56:52" (1/1) ... [2020-11-22 12:56:52,238 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:56:52" (1/1) ... [2020-11-22 12:56:52,270 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-11-22 12:56:52,272 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-11-22 12:56:52,272 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-11-22 12:56:52,272 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-11-22 12:56:52,280 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:56:52" (1/1) ... [2020-11-22 12:56:52,281 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:56:52" (1/1) ... [2020-11-22 12:56:52,295 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:56:52" (1/1) ... [2020-11-22 12:56:52,296 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:56:52" (1/1) ... [2020-11-22 12:56:52,302 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:56:52" (1/1) ... [2020-11-22 12:56:52,315 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:56:52" (1/1) ... [2020-11-22 12:56:52,319 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:56:52" (1/1) ... [2020-11-22 12:56:52,325 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-11-22 12:56:52,329 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-11-22 12:56:52,330 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-11-22 12:56:52,330 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-11-22 12:56:52,331 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:56:52" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_9c576bdf-6c7a-4d08-810f-30ed39d84206/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 12:56:52,401 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-11-22 12:56:52,401 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-11-22 12:56:52,401 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-11-22 12:56:52,401 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-11-22 12:56:52,401 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-11-22 12:56:52,401 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-11-22 12:56:53,110 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-11-22 12:56:53,110 INFO L298 CfgBuilder]: Removed 10 assume(true) statements. [2020-11-22 12:56:53,113 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 12:56:53 BoogieIcfgContainer [2020-11-22 12:56:53,113 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-11-22 12:56:53,114 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-11-22 12:56:53,114 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-11-22 12:56:53,119 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-11-22 12:56:53,119 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.11 12:56:51" (1/3) ... [2020-11-22 12:56:53,120 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7f8efe7e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 12:56:53, skipping insertion in model container [2020-11-22 12:56:53,120 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:56:52" (2/3) ... [2020-11-22 12:56:53,120 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7f8efe7e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 12:56:53, skipping insertion in model container [2020-11-22 12:56:53,120 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 12:56:53" (3/3) ... [2020-11-22 12:56:53,122 INFO L111 eAbstractionObserver]: Analyzing ICFG cstrchr_unsafe.i [2020-11-22 12:56:53,137 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-11-22 12:56:53,142 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 16 error locations. [2020-11-22 12:56:53,154 INFO L253 AbstractCegarLoop]: Starting to check reachability of 16 error locations. [2020-11-22 12:56:53,186 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-11-22 12:56:53,187 INFO L378 AbstractCegarLoop]: Hoare is false [2020-11-22 12:56:53,187 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-11-22 12:56:53,187 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-11-22 12:56:53,187 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-11-22 12:56:53,187 INFO L382 AbstractCegarLoop]: Difference is false [2020-11-22 12:56:53,187 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-11-22 12:56:53,187 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-11-22 12:56:53,204 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states. [2020-11-22 12:56:53,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2020-11-22 12:56:53,210 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 12:56:53,210 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1] [2020-11-22 12:56:53,211 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr11REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr10REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr15ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr7REQUIRES_VIOLATION, ULTIMATE.startErr6REQUIRES_VIOLATION, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr13ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr9REQUIRES_VIOLATION, ULTIMATE.startErr12ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr8REQUIRES_VIOLATION, ULTIMATE.startErr14ASSERT_VIOLATIONMEMORY_FREE]=== [2020-11-22 12:56:53,217 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 12:56:53,217 INFO L82 PathProgramCache]: Analyzing trace with hash 123554, now seen corresponding path program 1 times [2020-11-22 12:56:53,225 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 12:56:53,225 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [232174475] [2020-11-22 12:56:53,225 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 12:56:53,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 12:56:53,378 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 12:56:53,379 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [232174475] [2020-11-22 12:56:53,379 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-22 12:56:53,379 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2020-11-22 12:56:53,382 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1061844674] [2020-11-22 12:56:53,385 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-11-22 12:56:53,386 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 12:56:53,402 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-11-22 12:56:53,402 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-11-22 12:56:53,404 INFO L87 Difference]: Start difference. First operand 31 states. Second operand 3 states. [2020-11-22 12:56:53,505 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 12:56:53,506 INFO L93 Difference]: Finished difference Result 29 states and 31 transitions. [2020-11-22 12:56:53,506 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-11-22 12:56:53,507 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 3 [2020-11-22 12:56:53,508 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 12:56:53,515 INFO L225 Difference]: With dead ends: 29 [2020-11-22 12:56:53,515 INFO L226 Difference]: Without dead ends: 28 [2020-11-22 12:56:53,518 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 12:56:53,535 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-11-22 12:56:53,559 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-11-22 12:56:53,560 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-11-22 12:56:53,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2020-11-22 12:56:53,562 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 3 [2020-11-22 12:56:53,562 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 12:56:53,562 INFO L481 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2020-11-22 12:56:53,562 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-11-22 12:56:53,562 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2020-11-22 12:56:53,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2020-11-22 12:56:53,563 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 12:56:53,563 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1] [2020-11-22 12:56:53,563 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-11-22 12:56:53,563 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr11REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr10REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr15ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr7REQUIRES_VIOLATION, ULTIMATE.startErr6REQUIRES_VIOLATION, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr13ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr9REQUIRES_VIOLATION, ULTIMATE.startErr12ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr8REQUIRES_VIOLATION, ULTIMATE.startErr14ASSERT_VIOLATIONMEMORY_FREE]=== [2020-11-22 12:56:53,564 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 12:56:53,569 INFO L82 PathProgramCache]: Analyzing trace with hash 123555, now seen corresponding path program 1 times [2020-11-22 12:56:53,569 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 12:56:53,569 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1939808298] [2020-11-22 12:56:53,570 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 12:56:53,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 12:56:53,634 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 12:56:53,634 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1939808298] [2020-11-22 12:56:53,634 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-22 12:56:53,634 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-11-22 12:56:53,634 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1824587551] [2020-11-22 12:56:53,636 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-11-22 12:56:53,636 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 12:56:53,637 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-11-22 12:56:53,637 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-11-22 12:56:53,637 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 4 states. [2020-11-22 12:56:53,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 12:56:53,747 INFO L93 Difference]: Finished difference Result 54 states and 58 transitions. [2020-11-22 12:56:53,748 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-11-22 12:56:53,748 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 3 [2020-11-22 12:56:53,748 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 12:56:53,749 INFO L225 Difference]: With dead ends: 54 [2020-11-22 12:56:53,749 INFO L226 Difference]: Without dead ends: 54 [2020-11-22 12:56:53,750 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-11-22 12:56:53,751 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-11-22 12:56:53,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 30. [2020-11-22 12:56:53,755 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-11-22 12:56:53,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 33 transitions. [2020-11-22 12:56:53,756 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 33 transitions. Word has length 3 [2020-11-22 12:56:53,756 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 12:56:53,756 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 33 transitions. [2020-11-22 12:56:53,757 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-11-22 12:56:53,757 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 33 transitions. [2020-11-22 12:56:53,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2020-11-22 12:56:53,757 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 12:56:53,757 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1] [2020-11-22 12:56:53,757 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-11-22 12:56:53,758 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr11REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr10REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr15ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr7REQUIRES_VIOLATION, ULTIMATE.startErr6REQUIRES_VIOLATION, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr13ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr9REQUIRES_VIOLATION, ULTIMATE.startErr12ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr8REQUIRES_VIOLATION, ULTIMATE.startErr14ASSERT_VIOLATIONMEMORY_FREE]=== [2020-11-22 12:56:53,758 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 12:56:53,758 INFO L82 PathProgramCache]: Analyzing trace with hash 126075, now seen corresponding path program 1 times [2020-11-22 12:56:53,759 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 12:56:53,759 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [417030327] [2020-11-22 12:56:53,759 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 12:56:53,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 12:56:53,841 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 12:56:53,841 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [417030327] [2020-11-22 12:56:53,841 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-22 12:56:53,841 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2020-11-22 12:56:53,842 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [296747372] [2020-11-22 12:56:53,842 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-11-22 12:56:53,842 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 12:56:53,843 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-11-22 12:56:53,843 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-11-22 12:56:53,843 INFO L87 Difference]: Start difference. First operand 30 states and 33 transitions. Second operand 3 states. [2020-11-22 12:56:53,880 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 12:56:53,880 INFO L93 Difference]: Finished difference Result 29 states and 32 transitions. [2020-11-22 12:56:53,881 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-11-22 12:56:53,881 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 3 [2020-11-22 12:56:53,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 12:56:53,882 INFO L225 Difference]: With dead ends: 29 [2020-11-22 12:56:53,882 INFO L226 Difference]: Without dead ends: 29 [2020-11-22 12:56:53,882 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 12:56:53,883 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-11-22 12:56:53,885 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-11-22 12:56:53,885 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-11-22 12:56:53,886 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 32 transitions. [2020-11-22 12:56:53,886 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 32 transitions. Word has length 3 [2020-11-22 12:56:53,886 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 12:56:53,887 INFO L481 AbstractCegarLoop]: Abstraction has 29 states and 32 transitions. [2020-11-22 12:56:53,887 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-11-22 12:56:53,887 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 32 transitions. [2020-11-22 12:56:53,887 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2020-11-22 12:56:53,887 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 12:56:53,887 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2020-11-22 12:56:53,888 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-11-22 12:56:53,888 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr11REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr10REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr15ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr7REQUIRES_VIOLATION, ULTIMATE.startErr6REQUIRES_VIOLATION, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr13ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr9REQUIRES_VIOLATION, ULTIMATE.startErr12ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr8REQUIRES_VIOLATION, ULTIMATE.startErr14ASSERT_VIOLATIONMEMORY_FREE]=== [2020-11-22 12:56:53,891 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 12:56:53,891 INFO L82 PathProgramCache]: Analyzing trace with hash 3910347, now seen corresponding path program 1 times [2020-11-22 12:56:53,892 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 12:56:53,892 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1913659002] [2020-11-22 12:56:53,893 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 12:56:53,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 12:56:53,953 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 12:56:53,954 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1913659002] [2020-11-22 12:56:53,954 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-22 12:56:53,954 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-11-22 12:56:53,954 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1678205558] [2020-11-22 12:56:53,955 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-11-22 12:56:53,955 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 12:56:53,955 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-11-22 12:56:53,956 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-11-22 12:56:53,956 INFO L87 Difference]: Start difference. First operand 29 states and 32 transitions. Second operand 3 states. [2020-11-22 12:56:54,020 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 12:56:54,021 INFO L93 Difference]: Finished difference Result 26 states and 29 transitions. [2020-11-22 12:56:54,021 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-11-22 12:56:54,021 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 4 [2020-11-22 12:56:54,021 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 12:56:54,022 INFO L225 Difference]: With dead ends: 26 [2020-11-22 12:56:54,022 INFO L226 Difference]: Without dead ends: 26 [2020-11-22 12:56:54,022 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 12:56:54,023 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-11-22 12:56:54,025 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-11-22 12:56:54,025 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-11-22 12:56:54,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 29 transitions. [2020-11-22 12:56:54,026 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 29 transitions. Word has length 4 [2020-11-22 12:56:54,026 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 12:56:54,026 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 29 transitions. [2020-11-22 12:56:54,026 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-11-22 12:56:54,027 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 29 transitions. [2020-11-22 12:56:54,027 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2020-11-22 12:56:54,027 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 12:56:54,027 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2020-11-22 12:56:54,027 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-11-22 12:56:54,028 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr11REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr10REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr15ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr7REQUIRES_VIOLATION, ULTIMATE.startErr6REQUIRES_VIOLATION, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr13ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr9REQUIRES_VIOLATION, ULTIMATE.startErr12ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr8REQUIRES_VIOLATION, ULTIMATE.startErr14ASSERT_VIOLATIONMEMORY_FREE]=== [2020-11-22 12:56:54,028 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 12:56:54,028 INFO L82 PathProgramCache]: Analyzing trace with hash 3910348, now seen corresponding path program 1 times [2020-11-22 12:56:54,028 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 12:56:54,029 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [25221760] [2020-11-22 12:56:54,029 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 12:56:54,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 12:56:54,102 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 12:56:54,102 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [25221760] [2020-11-22 12:56:54,102 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-22 12:56:54,103 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-11-22 12:56:54,103 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [62221086] [2020-11-22 12:56:54,103 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-11-22 12:56:54,103 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 12:56:54,104 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-11-22 12:56:54,104 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-11-22 12:56:54,104 INFO L87 Difference]: Start difference. First operand 26 states and 29 transitions. Second operand 4 states. [2020-11-22 12:56:54,170 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 12:56:54,171 INFO L93 Difference]: Finished difference Result 42 states and 46 transitions. [2020-11-22 12:56:54,173 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-11-22 12:56:54,173 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 4 [2020-11-22 12:56:54,173 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 12:56:54,174 INFO L225 Difference]: With dead ends: 42 [2020-11-22 12:56:54,174 INFO L226 Difference]: Without dead ends: 42 [2020-11-22 12:56:54,174 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-11-22 12:56:54,175 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-11-22 12:56:54,178 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 31. [2020-11-22 12:56:54,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-11-22 12:56:54,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 36 transitions. [2020-11-22 12:56:54,179 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 36 transitions. Word has length 4 [2020-11-22 12:56:54,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 12:56:54,179 INFO L481 AbstractCegarLoop]: Abstraction has 31 states and 36 transitions. [2020-11-22 12:56:54,179 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-11-22 12:56:54,179 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 36 transitions. [2020-11-22 12:56:54,180 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2020-11-22 12:56:54,180 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 12:56:54,180 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1] [2020-11-22 12:56:54,180 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-11-22 12:56:54,180 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr11REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr10REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr15ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr7REQUIRES_VIOLATION, ULTIMATE.startErr6REQUIRES_VIOLATION, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr13ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr9REQUIRES_VIOLATION, ULTIMATE.startErr12ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr8REQUIRES_VIOLATION, ULTIMATE.startErr14ASSERT_VIOLATIONMEMORY_FREE]=== [2020-11-22 12:56:54,181 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 12:56:54,181 INFO L82 PathProgramCache]: Analyzing trace with hash 118806094, now seen corresponding path program 1 times [2020-11-22 12:56:54,181 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 12:56:54,181 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [65858158] [2020-11-22 12:56:54,182 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 12:56:54,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 12:56:54,272 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 12:56:54,272 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [65858158] [2020-11-22 12:56:54,272 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [523586982] [2020-11-22 12:56:54,273 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_9c576bdf-6c7a-4d08-810f-30ed39d84206/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 12:56:54,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 12:56:54,338 INFO L263 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 11 conjunts are in the unsatisfiable core [2020-11-22 12:56:54,342 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-22 12:56:54,409 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2020-11-22 12:56:54,410 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-11-22 12:56:54,422 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-22 12:56:54,422 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2020-11-22 12:56:54,423 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:13, output treesize:12 [2020-11-22 12:56:54,462 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 12:56:54,462 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-22 12:56:54,521 INFO L603 QuantifierPusher]: Distributing 2 disjuncts over 3 conjuncts [2020-11-22 12:56:54,554 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 12:56:54,555 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [774132814] [2020-11-22 12:56:54,578 INFO L159 IcfgInterpreter]: Started Sifa with 4 locations of interest [2020-11-22 12:56:54,578 INFO L166 IcfgInterpreter]: Building call graph [2020-11-22 12:56:54,583 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-22 12:56:54,589 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-22 12:56:54,589 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-22 12:56:54,819 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-11-22 12:56:55,031 INFO L180 IcfgInterpreter]: Interpretation finished [2020-11-22 12:56:55,306 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-11-22 12:56:55,306 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-22 12:56:55,306 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 7 [2020-11-22 12:56:55,306 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [728563604] [2020-11-22 12:56:55,307 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-11-22 12:56:55,307 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 12:56:55,307 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-11-22 12:56:55,308 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2020-11-22 12:56:55,308 INFO L87 Difference]: Start difference. First operand 31 states and 36 transitions. Second operand 9 states. [2020-11-22 12:56:55,525 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 12:56:55,525 INFO L93 Difference]: Finished difference Result 81 states and 93 transitions. [2020-11-22 12:56:55,525 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-11-22 12:56:55,525 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 5 [2020-11-22 12:56:55,526 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 12:56:55,526 INFO L225 Difference]: With dead ends: 81 [2020-11-22 12:56:55,527 INFO L226 Difference]: Without dead ends: 81 [2020-11-22 12:56:55,527 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-11-22 12:56:55,528 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2020-11-22 12:56:55,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 28. [2020-11-22 12:56:55,531 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-11-22 12:56:55,532 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2020-11-22 12:56:55,532 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 5 [2020-11-22 12:56:55,533 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 12:56:55,533 INFO L481 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2020-11-22 12:56:55,533 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-11-22 12:56:55,533 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2020-11-22 12:56:55,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2020-11-22 12:56:55,533 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 12:56:55,534 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2020-11-22 12:56:55,734 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2020-11-22 12:56:55,735 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr11REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr10REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr15ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr7REQUIRES_VIOLATION, ULTIMATE.startErr6REQUIRES_VIOLATION, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr13ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr9REQUIRES_VIOLATION, ULTIMATE.startErr12ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr8REQUIRES_VIOLATION, ULTIMATE.startErr14ASSERT_VIOLATIONMEMORY_FREE]=== [2020-11-22 12:56:55,735 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 12:56:55,735 INFO L82 PathProgramCache]: Analyzing trace with hash 530568868, now seen corresponding path program 1 times [2020-11-22 12:56:55,735 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 12:56:55,736 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1600259609] [2020-11-22 12:56:55,736 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 12:56:55,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 12:56:55,764 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 12:56:55,765 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1600259609] [2020-11-22 12:56:55,765 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-22 12:56:55,765 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-11-22 12:56:55,765 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1619329044] [2020-11-22 12:56:55,765 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-11-22 12:56:55,766 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 12:56:55,766 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-11-22 12:56:55,766 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-11-22 12:56:55,766 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand 3 states. [2020-11-22 12:56:55,776 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 12:56:55,776 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2020-11-22 12:56:55,777 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-11-22 12:56:55,777 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 7 [2020-11-22 12:56:55,777 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 12:56:55,778 INFO L225 Difference]: With dead ends: 30 [2020-11-22 12:56:55,778 INFO L226 Difference]: Without dead ends: 30 [2020-11-22 12:56:55,778 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 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 12:56:55,779 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-11-22 12:56:55,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-11-22 12:56:55,781 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-11-22 12:56:55,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 34 transitions. [2020-11-22 12:56:55,781 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 34 transitions. Word has length 7 [2020-11-22 12:56:55,781 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 12:56:55,781 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 34 transitions. [2020-11-22 12:56:55,782 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-11-22 12:56:55,782 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 34 transitions. [2020-11-22 12:56:55,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2020-11-22 12:56:55,782 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 12:56:55,782 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2020-11-22 12:56:55,782 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-11-22 12:56:55,782 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr11REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr10REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr15ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr7REQUIRES_VIOLATION, ULTIMATE.startErr6REQUIRES_VIOLATION, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr13ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr9REQUIRES_VIOLATION, ULTIMATE.startErr12ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr8REQUIRES_VIOLATION, ULTIMATE.startErr14ASSERT_VIOLATIONMEMORY_FREE]=== [2020-11-22 12:56:55,783 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 12:56:55,783 INFO L82 PathProgramCache]: Analyzing trace with hash -732234204, now seen corresponding path program 1 times [2020-11-22 12:56:55,783 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 12:56:55,783 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [749239490] [2020-11-22 12:56:55,783 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 12:56:55,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-22 12:56:55,813 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-22 12:56:55,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-22 12:56:55,832 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-22 12:56:55,859 INFO L173 FreeRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2020-11-22 12:56:55,859 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-11-22 12:56:55,860 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-11-22 12:56:55,889 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.11 12:56:55 BoogieIcfgContainer [2020-11-22 12:56:55,890 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-11-22 12:56:55,890 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-11-22 12:56:55,890 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-11-22 12:56:55,891 INFO L275 PluginConnector]: Witness Printer initialized [2020-11-22 12:56:55,891 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 12:56:53" (3/4) ... [2020-11-22 12:56:55,893 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2020-11-22 12:56:55,954 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_9c576bdf-6c7a-4d08-810f-30ed39d84206/bin/utaipan/witness.graphml [2020-11-22 12:56:55,955 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-11-22 12:56:55,956 INFO L168 Benchmark]: Toolchain (without parser) took 4239.25 ms. Allocated memory was 88.1 MB in the beginning and 119.5 MB in the end (delta: 31.5 MB). Free memory was 55.5 MB in the beginning and 81.8 MB in the end (delta: -26.3 MB). Peak memory consumption was 3.5 MB. Max. memory is 16.1 GB. [2020-11-22 12:56:55,956 INFO L168 Benchmark]: CDTParser took 0.25 ms. Allocated memory is still 69.2 MB. Free memory was 31.3 MB in the beginning and 31.2 MB in the end (delta: 56.0 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-22 12:56:55,957 INFO L168 Benchmark]: CACSL2BoogieTranslator took 486.16 ms. Allocated memory is still 88.1 MB. Free memory was 55.3 MB in the beginning and 54.7 MB in the end (delta: 518.7 kB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2020-11-22 12:56:55,958 INFO L168 Benchmark]: Boogie Procedure Inliner took 65.61 ms. Allocated memory is still 88.1 MB. Free memory was 54.7 MB in the beginning and 53.1 MB in the end (delta: 1.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-22 12:56:55,960 INFO L168 Benchmark]: Boogie Preprocessor took 56.86 ms. Allocated memory is still 88.1 MB. Free memory was 52.7 MB in the beginning and 51.4 MB in the end (delta: 1.2 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-22 12:56:55,963 INFO L168 Benchmark]: RCFGBuilder took 783.67 ms. Allocated memory is still 88.1 MB. Free memory was 51.4 MB in the beginning and 59.4 MB in the end (delta: -7.9 MB). Peak memory consumption was 27.1 MB. Max. memory is 16.1 GB. [2020-11-22 12:56:55,964 INFO L168 Benchmark]: TraceAbstraction took 2775.39 ms. Allocated memory was 88.1 MB in the beginning and 119.5 MB in the end (delta: 31.5 MB). Free memory was 59.4 MB in the beginning and 83.9 MB in the end (delta: -24.5 MB). Peak memory consumption was 8.0 MB. Max. memory is 16.1 GB. [2020-11-22 12:56:55,965 INFO L168 Benchmark]: Witness Printer took 64.46 ms. Allocated memory is still 119.5 MB. Free memory was 83.9 MB in the beginning and 81.8 MB in the end (delta: 2.1 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-22 12:56:55,967 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.25 ms. Allocated memory is still 69.2 MB. Free memory was 31.3 MB in the beginning and 31.2 MB in the end (delta: 56.0 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 486.16 ms. Allocated memory is still 88.1 MB. Free memory was 55.3 MB in the beginning and 54.7 MB in the end (delta: 518.7 kB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 65.61 ms. Allocated memory is still 88.1 MB. Free memory was 54.7 MB in the beginning and 53.1 MB in the end (delta: 1.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 56.86 ms. Allocated memory is still 88.1 MB. Free memory was 52.7 MB in the beginning and 51.4 MB in the end (delta: 1.2 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 783.67 ms. Allocated memory is still 88.1 MB. Free memory was 51.4 MB in the beginning and 59.4 MB in the end (delta: -7.9 MB). Peak memory consumption was 27.1 MB. Max. memory is 16.1 GB. * TraceAbstraction took 2775.39 ms. Allocated memory was 88.1 MB in the beginning and 119.5 MB in the end (delta: 31.5 MB). Free memory was 59.4 MB in the beginning and 83.9 MB in the end (delta: -24.5 MB). Peak memory consumption was 8.0 MB. Max. memory is 16.1 GB. * Witness Printer took 64.46 ms. Allocated memory is still 119.5 MB. Free memory was 83.9 MB in the beginning and 81.8 MB in the end (delta: 2.1 MB). There was no memory consumed. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 537]: pointer dereference may fail pointer dereference may fail We found a FailurePath: [L515] int length = __VERIFIER_nondet_int(); [L516] COND TRUE length < 1 [L517] length = 1 [L519] char* nondetString = (char*) malloc(length * sizeof(char)); [L521] int i = 0; [L521] COND FALSE !(i < length - 1) [L526] nondetString[length-1] = '\0' [L527] return nondetString; [L536] char* s = build_nondet_String(); [L531] EXPR \read(*s) [L531] *s != '\0' && *s != (char)c [L531] COND FALSE !(*s != '\0' && *s != (char)c) [L533] EXPR \read(*s) [L533] EXPR (*s == c) ? (char *) s : 0 [L533] return ( (*s == c) ? (char *) s : 0 ); - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 31 locations, 16 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 2.6s, OverallIterations: 8, TraceHistogramMax: 2, AutomataDifference: 0.6s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 143 SDtfs, 288 SDslu, 136 SDs, 0 SdLazy, 220 SolverSat, 11 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 32 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.5s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=31occurred in iteration=0, 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, 7 MinimizatonAttempts, 88 StatesRemovedByMinimization, 3 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 0.5s InterpolantComputationTime, 42 NumberOfCodeBlocks, 42 NumberOfCodeBlocksAsserted, 9 NumberOfCheckSat, 30 ConstructedInterpolants, 0 QuantifiedInterpolants, 988 SizeOfPredicates, 3 NumberOfNonLiveVariables, 39 ConjunctsInSsa, 11 ConjunctsInUnsatCore, 9 InterpolantComputations, 6 PerfectInterpolantSequences, 2/7 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...