./Ultimate.py --spec ../sv-benchmarks/c/properties/valid-memsafety.prp --file ../sv-benchmarks/c/memsafety-ext3/derefAfterFree1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 20ed64ec Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerMemDerefMemtrack.xml -i ../sv-benchmarks/c/memsafety-ext3/derefAfterFree1.c -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --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 Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash d452f938d74713dbff7e0330f8ef393409d67ffe ................................................................................................................................................................................................................................................................................................................................................................................................... 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 0.2.1-dev-20ed64e [2021-08-27 07:51:28,957 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-08-27 07:51:28,959 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-08-27 07:51:28,983 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-08-27 07:51:28,983 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-08-27 07:51:28,984 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-08-27 07:51:28,986 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-08-27 07:51:28,988 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-08-27 07:51:28,989 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-08-27 07:51:28,990 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-08-27 07:51:28,991 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-08-27 07:51:28,992 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-08-27 07:51:28,992 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-08-27 07:51:28,993 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-08-27 07:51:28,995 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-08-27 07:51:28,996 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-08-27 07:51:28,996 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-08-27 07:51:28,997 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-08-27 07:51:28,999 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-08-27 07:51:29,000 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-08-27 07:51:29,002 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-08-27 07:51:29,003 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-08-27 07:51:29,004 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-08-27 07:51:29,004 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-08-27 07:51:29,007 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-08-27 07:51:29,007 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-08-27 07:51:29,008 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-08-27 07:51:29,008 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-08-27 07:51:29,009 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-08-27 07:51:29,010 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-08-27 07:51:29,010 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-08-27 07:51:29,011 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-08-27 07:51:29,011 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-08-27 07:51:29,012 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-08-27 07:51:29,013 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-08-27 07:51:29,014 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-08-27 07:51:29,014 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-08-27 07:51:29,015 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-08-27 07:51:29,015 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-08-27 07:51:29,016 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-08-27 07:51:29,017 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-08-27 07:51:29,018 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf [2021-08-27 07:51:29,037 INFO L113 SettingsManager]: Loading preferences was successful [2021-08-27 07:51:29,039 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-08-27 07:51:29,041 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-08-27 07:51:29,041 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-08-27 07:51:29,043 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-08-27 07:51:29,045 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-08-27 07:51:29,045 INFO L138 SettingsManager]: * Use SBE=true [2021-08-27 07:51:29,045 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-08-27 07:51:29,045 INFO L138 SettingsManager]: * sizeof long=4 [2021-08-27 07:51:29,045 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-08-27 07:51:29,046 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-08-27 07:51:29,046 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-08-27 07:51:29,047 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-08-27 07:51:29,047 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-08-27 07:51:29,049 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-08-27 07:51:29,049 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-08-27 07:51:29,049 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-08-27 07:51:29,049 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-08-27 07:51:29,049 INFO L138 SettingsManager]: * sizeof long double=12 [2021-08-27 07:51:29,049 INFO L138 SettingsManager]: * Use constant arrays=true [2021-08-27 07:51:29,063 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-08-27 07:51:29,063 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-08-27 07:51:29,063 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-08-27 07:51:29,063 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-08-27 07:51:29,064 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-08-27 07:51:29,064 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-08-27 07:51:29,064 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-08-27 07:51:29,064 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-08-27 07:51:29,065 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-08-27 07:51:29,065 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> d452f938d74713dbff7e0330f8ef393409d67ffe [2021-08-27 07:51:29,393 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-08-27 07:51:29,416 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-08-27 07:51:29,419 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-08-27 07:51:29,420 INFO L271 PluginConnector]: Initializing CDTParser... [2021-08-27 07:51:29,421 INFO L275 PluginConnector]: CDTParser initialized [2021-08-27 07:51:29,422 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/memsafety-ext3/derefAfterFree1.c [2021-08-27 07:51:29,493 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a501a76a3/4508ae5c451f412d94097fd470dbc25b/FLAGb4b196052 [2021-08-27 07:51:29,972 INFO L306 CDTParser]: Found 1 translation units. [2021-08-27 07:51:29,972 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/memsafety-ext3/derefAfterFree1.c [2021-08-27 07:51:29,992 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a501a76a3/4508ae5c451f412d94097fd470dbc25b/FLAGb4b196052 [2021-08-27 07:51:30,364 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a501a76a3/4508ae5c451f412d94097fd470dbc25b [2021-08-27 07:51:30,366 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-08-27 07:51:30,368 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-08-27 07:51:30,369 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-08-27 07:51:30,369 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-08-27 07:51:30,387 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-08-27 07:51:30,387 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.08 07:51:30" (1/1) ... [2021-08-27 07:51:30,388 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7e1d4ef4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 07:51:30, skipping insertion in model container [2021-08-27 07:51:30,388 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.08 07:51:30" (1/1) ... [2021-08-27 07:51:30,394 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-08-27 07:51:30,405 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-08-27 07:51:30,507 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-08-27 07:51:30,514 INFO L203 MainTranslator]: Completed pre-run [2021-08-27 07:51:30,559 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-08-27 07:51:30,571 INFO L208 MainTranslator]: Completed translation [2021-08-27 07:51:30,571 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 07:51:30 WrapperNode [2021-08-27 07:51:30,571 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-08-27 07:51:30,572 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-08-27 07:51:30,573 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-08-27 07:51:30,573 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-08-27 07:51:30,581 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 07:51:30" (1/1) ... [2021-08-27 07:51:30,582 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 07:51:30" (1/1) ... [2021-08-27 07:51:30,587 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 07:51:30" (1/1) ... [2021-08-27 07:51:30,587 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 07:51:30" (1/1) ... [2021-08-27 07:51:30,592 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 07:51:30" (1/1) ... [2021-08-27 07:51:30,593 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 07:51:30" (1/1) ... [2021-08-27 07:51:30,598 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 07:51:30" (1/1) ... [2021-08-27 07:51:30,599 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-08-27 07:51:30,601 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-08-27 07:51:30,601 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-08-27 07:51:30,601 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-08-27 07:51:30,602 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 07:51:30" (1/1) ... [2021-08-27 07:51:30,607 INFO L170 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-08-27 07:51:30,613 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-27 07:51:30,630 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-08-27 07:51:30,641 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-08-27 07:51:30,675 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-08-27 07:51:30,675 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-08-27 07:51:30,675 INFO L138 BoogieDeclarations]: Found implementation of procedure freePointer [2021-08-27 07:51:30,676 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-08-27 07:51:30,676 INFO L130 BoogieDeclarations]: Found specification of procedure free [2021-08-27 07:51:30,676 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2021-08-27 07:51:30,676 INFO L130 BoogieDeclarations]: Found specification of procedure freePointer [2021-08-27 07:51:30,677 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-08-27 07:51:30,677 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-08-27 07:51:30,677 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-08-27 07:51:30,677 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-08-27 07:51:30,678 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-08-27 07:51:30,678 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-08-27 07:51:30,678 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-08-27 07:51:30,917 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-08-27 07:51:30,932 INFO L299 CfgBuilder]: Removed 0 assume(true) statements. [2021-08-27 07:51:30,935 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.08 07:51:30 BoogieIcfgContainer [2021-08-27 07:51:30,935 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-08-27 07:51:30,936 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-08-27 07:51:30,936 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-08-27 07:51:30,939 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-08-27 07:51:30,939 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 27.08 07:51:30" (1/3) ... [2021-08-27 07:51:30,940 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3a55fa9d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.08 07:51:30, skipping insertion in model container [2021-08-27 07:51:30,940 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 07:51:30" (2/3) ... [2021-08-27 07:51:30,940 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3a55fa9d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.08 07:51:30, skipping insertion in model container [2021-08-27 07:51:30,941 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.08 07:51:30" (3/3) ... [2021-08-27 07:51:30,942 INFO L111 eAbstractionObserver]: Analyzing ICFG derefAfterFree1.c [2021-08-27 07:51:30,961 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-08-27 07:51:30,961 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 6 error locations. [2021-08-27 07:51:31,021 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-08-27 07:51:31,029 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=false, mConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-08-27 07:51:31,031 INFO L340 AbstractCegarLoop]: Starting to check reachability of 6 error locations. [2021-08-27 07:51:31,048 INFO L276 IsEmpty]: Start isEmpty. Operand has 25 states, 12 states have (on average 1.5) internal successors, (18), 18 states have internal predecessors, (18), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-08-27 07:51:31,056 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-08-27 07:51:31,057 INFO L504 BasicCegarLoop]: Found error trace [2021-08-27 07:51:31,057 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-27 07:51:31,058 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting freePointerErr0ASSERT_VIOLATIONMEMORY_FREE === [freePointerErr0ASSERT_VIOLATIONMEMORY_FREE, freePointerErr1ASSERT_VIOLATIONMEMORY_FREE, freePointerErr2ASSERT_VIOLATIONMEMORY_FREE (and 3 more)] === [2021-08-27 07:51:31,067 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-27 07:51:31,067 INFO L82 PathProgramCache]: Analyzing trace with hash 1608321379, now seen corresponding path program 1 times [2021-08-27 07:51:31,075 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-27 07:51:31,075 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [881104243] [2021-08-27 07:51:31,076 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-27 07:51:31,077 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-27 07:51:31,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:51:31,282 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-08-27 07:51:31,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:51:31,293 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-27 07:51:31,293 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-27 07:51:31,293 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [881104243] [2021-08-27 07:51:31,294 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [881104243] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-27 07:51:31,294 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-27 07:51:31,295 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-08-27 07:51:31,296 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1857232695] [2021-08-27 07:51:31,300 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-08-27 07:51:31,301 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-27 07:51:31,310 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-08-27 07:51:31,311 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-08-27 07:51:31,313 INFO L87 Difference]: Start difference. First operand has 25 states, 12 states have (on average 1.5) internal successors, (18), 18 states have internal predecessors, (18), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 6 states, 4 states have (on average 1.25) internal successors, (5), 4 states have internal predecessors, (5), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-08-27 07:51:31,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-27 07:51:31,464 INFO L93 Difference]: Finished difference Result 24 states and 23 transitions. [2021-08-27 07:51:31,465 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-08-27 07:51:31,466 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 4 states have (on average 1.25) internal successors, (5), 4 states have internal predecessors, (5), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 9 [2021-08-27 07:51:31,466 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-27 07:51:31,472 INFO L225 Difference]: With dead ends: 24 [2021-08-27 07:51:31,472 INFO L226 Difference]: Without dead ends: 21 [2021-08-27 07:51:31,473 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 109.2ms TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-08-27 07:51:31,486 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-08-27 07:51:31,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2021-08-27 07:51:31,506 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 11 states have (on average 1.3636363636363635) internal successors, (15), 15 states have internal predecessors, (15), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-08-27 07:51:31,506 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 20 transitions. [2021-08-27 07:51:31,507 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 20 transitions. Word has length 9 [2021-08-27 07:51:31,507 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-27 07:51:31,508 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 20 transitions. [2021-08-27 07:51:31,508 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 4 states have (on average 1.25) internal successors, (5), 4 states have internal predecessors, (5), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-08-27 07:51:31,508 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 20 transitions. [2021-08-27 07:51:31,508 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-08-27 07:51:31,508 INFO L504 BasicCegarLoop]: Found error trace [2021-08-27 07:51:31,509 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-27 07:51:31,509 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-08-27 07:51:31,509 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting freePointerErr1ASSERT_VIOLATIONMEMORY_FREE === [freePointerErr0ASSERT_VIOLATIONMEMORY_FREE, freePointerErr1ASSERT_VIOLATIONMEMORY_FREE, freePointerErr2ASSERT_VIOLATIONMEMORY_FREE (and 3 more)] === [2021-08-27 07:51:31,510 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-27 07:51:31,510 INFO L82 PathProgramCache]: Analyzing trace with hash -1681644769, now seen corresponding path program 1 times [2021-08-27 07:51:31,510 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-27 07:51:31,510 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [179045611] [2021-08-27 07:51:31,510 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-27 07:51:31,511 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-27 07:51:31,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:51:31,668 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-08-27 07:51:31,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:51:31,691 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-27 07:51:31,691 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-27 07:51:31,692 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [179045611] [2021-08-27 07:51:31,692 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [179045611] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-27 07:51:31,692 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-27 07:51:31,692 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-08-27 07:51:31,693 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2123331704] [2021-08-27 07:51:31,694 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-08-27 07:51:31,694 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-27 07:51:31,695 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-08-27 07:51:31,695 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-08-27 07:51:31,695 INFO L87 Difference]: Start difference. First operand 21 states and 20 transitions. Second operand has 6 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-08-27 07:51:31,839 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-27 07:51:31,839 INFO L93 Difference]: Finished difference Result 20 states and 19 transitions. [2021-08-27 07:51:31,840 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-08-27 07:51:31,840 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 10 [2021-08-27 07:51:31,840 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-27 07:51:31,841 INFO L225 Difference]: With dead ends: 20 [2021-08-27 07:51:31,841 INFO L226 Difference]: Without dead ends: 20 [2021-08-27 07:51:31,842 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 130.8ms TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-08-27 07:51:31,842 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-08-27 07:51:31,844 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2021-08-27 07:51:31,845 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 14 states have internal predecessors, (14), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-08-27 07:51:31,845 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 19 transitions. [2021-08-27 07:51:31,845 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 19 transitions. Word has length 10 [2021-08-27 07:51:31,846 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-27 07:51:31,846 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 19 transitions. [2021-08-27 07:51:31,846 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-08-27 07:51:31,846 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 19 transitions. [2021-08-27 07:51:31,847 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-08-27 07:51:31,847 INFO L504 BasicCegarLoop]: Found error trace [2021-08-27 07:51:31,847 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-27 07:51:31,847 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-08-27 07:51:31,848 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting freePointerErr2ASSERT_VIOLATIONMEMORY_FREE === [freePointerErr0ASSERT_VIOLATIONMEMORY_FREE, freePointerErr1ASSERT_VIOLATIONMEMORY_FREE, freePointerErr2ASSERT_VIOLATIONMEMORY_FREE (and 3 more)] === [2021-08-27 07:51:31,848 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-27 07:51:31,848 INFO L82 PathProgramCache]: Analyzing trace with hash -591380251, now seen corresponding path program 1 times [2021-08-27 07:51:31,848 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-27 07:51:31,849 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [916586265] [2021-08-27 07:51:31,849 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-27 07:51:31,849 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-27 07:51:31,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:51:31,937 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-08-27 07:51:31,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:51:31,960 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-27 07:51:31,961 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-27 07:51:31,961 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [916586265] [2021-08-27 07:51:31,962 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [916586265] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-27 07:51:31,962 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-27 07:51:31,963 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-08-27 07:51:31,963 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [57143815] [2021-08-27 07:51:31,965 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-08-27 07:51:31,965 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-27 07:51:31,966 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-08-27 07:51:31,966 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-08-27 07:51:31,967 INFO L87 Difference]: Start difference. First operand 20 states and 19 transitions. Second operand has 6 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-08-27 07:51:32,083 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-27 07:51:32,084 INFO L93 Difference]: Finished difference Result 19 states and 18 transitions. [2021-08-27 07:51:32,084 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-08-27 07:51:32,084 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-08-27 07:51:32,085 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-27 07:51:32,085 INFO L225 Difference]: With dead ends: 19 [2021-08-27 07:51:32,085 INFO L226 Difference]: Without dead ends: 19 [2021-08-27 07:51:32,086 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 80.9ms TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-08-27 07:51:32,086 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-08-27 07:51:32,087 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2021-08-27 07:51:32,088 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 13 states have internal predecessors, (13), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-08-27 07:51:32,088 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 18 transitions. [2021-08-27 07:51:32,088 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 18 transitions. Word has length 11 [2021-08-27 07:51:32,089 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-27 07:51:32,089 INFO L470 AbstractCegarLoop]: Abstraction has 19 states and 18 transitions. [2021-08-27 07:51:32,089 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-08-27 07:51:32,089 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 18 transitions. [2021-08-27 07:51:32,090 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-08-27 07:51:32,090 INFO L504 BasicCegarLoop]: Found error trace [2021-08-27 07:51:32,090 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-27 07:51:32,090 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-08-27 07:51:32,091 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting mainErr0REQUIRES_VIOLATION === [freePointerErr0ASSERT_VIOLATIONMEMORY_FREE, freePointerErr1ASSERT_VIOLATIONMEMORY_FREE, freePointerErr2ASSERT_VIOLATIONMEMORY_FREE (and 3 more)] === [2021-08-27 07:51:32,091 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-27 07:51:32,091 INFO L82 PathProgramCache]: Analyzing trace with hash 146827991, now seen corresponding path program 1 times [2021-08-27 07:51:32,091 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-27 07:51:32,092 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [524873101] [2021-08-27 07:51:32,092 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-27 07:51:32,092 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-27 07:51:32,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-08-27 07:51:32,105 INFO L354 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-08-27 07:51:32,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-08-27 07:51:32,129 INFO L133 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-08-27 07:51:32,129 INFO L626 BasicCegarLoop]: Counterexample is feasible [2021-08-27 07:51:32,130 INFO L764 garLoopResultBuilder]: Registering result UNSAFE for location mainErr0REQUIRES_VIOLATION [2021-08-27 07:51:32,131 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location freePointerErr0ASSERT_VIOLATIONMEMORY_FREE [2021-08-27 07:51:32,132 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location freePointerErr1ASSERT_VIOLATIONMEMORY_FREE [2021-08-27 07:51:32,132 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location freePointerErr2ASSERT_VIOLATIONMEMORY_FREE [2021-08-27 07:51:32,132 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location mainErr1REQUIRES_VIOLATION [2021-08-27 07:51:32,132 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location mainErr2ENSURES_VIOLATIONMEMORY_LEAK [2021-08-27 07:51:32,133 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-08-27 07:51:32,138 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-08-27 07:51:32,150 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 27.08 07:51:32 BoogieIcfgContainer [2021-08-27 07:51:32,151 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-08-27 07:51:32,151 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-08-27 07:51:32,151 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-08-27 07:51:32,151 INFO L275 PluginConnector]: Witness Printer initialized [2021-08-27 07:51:32,152 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.08 07:51:30" (3/4) ... [2021-08-27 07:51:32,153 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2021-08-27 07:51:32,178 INFO L141 WitnessManager]: Wrote witness to /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/witness.graphml [2021-08-27 07:51:32,178 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-08-27 07:51:32,180 INFO L168 Benchmark]: Toolchain (without parser) took 1811.88 ms. Allocated memory was 71.3 MB in the beginning and 88.1 MB in the end (delta: 16.8 MB). Free memory was 56.1 MB in the beginning and 61.4 MB in the end (delta: -5.2 MB). Peak memory consumption was 10.6 MB. Max. memory is 16.1 GB. [2021-08-27 07:51:32,180 INFO L168 Benchmark]: CDTParser took 0.17 ms. Allocated memory is still 71.3 MB. Free memory is still 54.1 MB. There was no memory consumed. Max. memory is 16.1 GB. [2021-08-27 07:51:32,181 INFO L168 Benchmark]: CACSL2BoogieTranslator took 202.82 ms. Allocated memory is still 71.3 MB. Free memory was 55.9 MB in the beginning and 55.8 MB in the end (delta: 157.9 kB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. [2021-08-27 07:51:32,181 INFO L168 Benchmark]: Boogie Preprocessor took 27.49 ms. Allocated memory is still 71.3 MB. Free memory was 55.8 MB in the beginning and 54.4 MB in the end (delta: 1.4 MB). There was no memory consumed. Max. memory is 16.1 GB. [2021-08-27 07:51:32,182 INFO L168 Benchmark]: RCFGBuilder took 334.41 ms. Allocated memory is still 71.3 MB. Free memory was 54.4 MB in the beginning and 42.3 MB in the end (delta: 12.1 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. [2021-08-27 07:51:32,182 INFO L168 Benchmark]: TraceAbstraction took 1214.43 ms. Allocated memory was 71.3 MB in the beginning and 88.1 MB in the end (delta: 16.8 MB). Free memory was 41.8 MB in the beginning and 63.5 MB in the end (delta: -21.6 MB). There was no memory consumed. Max. memory is 16.1 GB. [2021-08-27 07:51:32,183 INFO L168 Benchmark]: Witness Printer took 27.30 ms. Allocated memory is still 88.1 MB. Free memory was 63.5 MB in the beginning and 61.4 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-08-27 07:51:32,185 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.17 ms. Allocated memory is still 71.3 MB. Free memory is still 54.1 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 202.82 ms. Allocated memory is still 71.3 MB. Free memory was 55.9 MB in the beginning and 55.8 MB in the end (delta: 157.9 kB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 27.49 ms. Allocated memory is still 71.3 MB. Free memory was 55.8 MB in the beginning and 54.4 MB in the end (delta: 1.4 MB). There was no memory consumed. Max. memory is 16.1 GB. * RCFGBuilder took 334.41 ms. Allocated memory is still 71.3 MB. Free memory was 54.4 MB in the beginning and 42.3 MB in the end (delta: 12.1 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. * TraceAbstraction took 1214.43 ms. Allocated memory was 71.3 MB in the beginning and 88.1 MB in the end (delta: 16.8 MB). Free memory was 41.8 MB in the beginning and 63.5 MB in the end (delta: -21.6 MB). There was no memory consumed. Max. memory is 16.1 GB. * Witness Printer took 27.30 ms. Allocated memory is still 88.1 MB. Free memory was 63.5 MB in the beginning and 61.4 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: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0ms ErrorAutomatonConstructionTimeTotal, 0.0ms FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0ms ErrorAutomatonConstructionTimeAvg, 0.0ms ErrorAutomatonDifferenceTimeAvg, 0.0ms ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - CounterExampleResult [Line: 14]: pointer dereference may fail pointer dereference may fail We found a FailurePath: [L10] int* p = malloc(10 * sizeof(int)); [L12] CALL freePointer(p) VAL [p={-1:0}] [L6] free(p) VAL [p={-1:0}, p={-1:0}] [L6] free(p) VAL [p={-1:0}, p={-1:0}] [L6] free(p) [L12] RET freePointer(p) VAL [p={-1:0}] [L14] p[0] = 1 - UnprovableResult [Line: 6]: Unable to prove that free always succeeds Unable to prove that free always succeeds Reason: Not analyzed. - UnprovableResult [Line: 6]: Unable to prove that free always succeeds Unable to prove that free always succeeds Reason: Not analyzed. - UnprovableResult [Line: 6]: Unable to prove that free always succeeds Unable to prove that free always succeeds Reason: Not analyzed. - UnprovableResult [Line: 14]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 9]: Unable to prove that all allocated memory was freed Unable to prove that all allocated memory was freed Reason: Not analyzed. - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 25 locations, 6 error locations. Started 1 CEGAR loops. OverallTime: 1116.2ms, OverallIterations: 4, TraceHistogramMax: 1, EmptinessCheckTime: 13.8ms, AutomataDifference: 440.4ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 12.6ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 35 SDtfs, 47 SDslu, 75 SDs, 0 SdLazy, 114 SolverSat, 12 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 155.7ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 27 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 321.0ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=25occurred in iteration=0, InterpolantAutomatonStates: 21, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 28.4ms AutomataMinimizationTime, 3 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 21.5ms SsaConstructionTime, 59.7ms SatisfiabilityAnalysisTime, 375.5ms InterpolantComputationTime, 44 NumberOfCodeBlocks, 44 NumberOfCodeBlocksAsserted, 4 NumberOfCheckSat, 27 ConstructedInterpolants, 0 QuantifiedInterpolants, 96 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 3 InterpolantComputations, 3 PerfectInterpolantSequences, 0/0 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! [2021-08-27 07:51:32,220 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request...