./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/array-memsafety/reverse_array_alloca_unsafe.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version f470102c Calling Ultimate with: /usr/lib/jvm/java-8-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_6fde4b4b-d27b-42ab-8075-a688758864ed/bin/utaipan/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/run_dir_6fde4b4b-d27b-42ab-8075-a688758864ed/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_6fde4b4b-d27b-42ab-8075-a688758864ed/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_6fde4b4b-d27b-42ab-8075-a688758864ed/bin/utaipan/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/reverse_array_alloca_unsafe.i -s /tmp/vcloud-vcloud-master/worker/run_dir_6fde4b4b-d27b-42ab-8075-a688758864ed/bin/utaipan/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_6fde4b4b-d27b-42ab-8075-a688758864ed/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 016c9c68c49c3eaa925dd855e3c8f320ab9c50c9 ............................................................................................................................................................................................................................................................................................................................................................................................................................................................................. 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 0.1.25-f470102 [2019-12-07 10:55:31,029 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-12-07 10:55:31,031 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-12-07 10:55:31,038 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-12-07 10:55:31,039 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-12-07 10:55:31,039 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-12-07 10:55:31,040 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-12-07 10:55:31,042 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-12-07 10:55:31,043 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-12-07 10:55:31,044 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-12-07 10:55:31,045 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-12-07 10:55:31,045 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-12-07 10:55:31,046 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-12-07 10:55:31,046 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-12-07 10:55:31,047 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-12-07 10:55:31,048 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-12-07 10:55:31,048 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-12-07 10:55:31,049 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-12-07 10:55:31,050 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-12-07 10:55:31,052 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-12-07 10:55:31,053 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-12-07 10:55:31,054 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-12-07 10:55:31,054 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-12-07 10:55:31,055 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-12-07 10:55:31,056 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-12-07 10:55:31,057 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-12-07 10:55:31,057 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-12-07 10:55:31,057 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-12-07 10:55:31,057 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-12-07 10:55:31,058 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-12-07 10:55:31,058 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-12-07 10:55:31,058 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-12-07 10:55:31,059 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-12-07 10:55:31,060 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-12-07 10:55:31,060 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-12-07 10:55:31,061 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-12-07 10:55:31,061 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-12-07 10:55:31,061 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-12-07 10:55:31,062 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-12-07 10:55:31,062 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-12-07 10:55:31,063 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-12-07 10:55:31,064 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_6fde4b4b-d27b-42ab-8075-a688758864ed/bin/utaipan/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2019-12-07 10:55:31,077 INFO L113 SettingsManager]: Loading preferences was successful [2019-12-07 10:55:31,077 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-12-07 10:55:31,078 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-12-07 10:55:31,078 INFO L138 SettingsManager]: * User list type=DISABLED [2019-12-07 10:55:31,078 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-12-07 10:55:31,078 INFO L138 SettingsManager]: * Explicit value domain=true [2019-12-07 10:55:31,079 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2019-12-07 10:55:31,079 INFO L138 SettingsManager]: * Octagon Domain=false [2019-12-07 10:55:31,079 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2019-12-07 10:55:31,079 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2019-12-07 10:55:31,079 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2019-12-07 10:55:31,080 INFO L138 SettingsManager]: * Interval Domain=false [2019-12-07 10:55:31,080 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2019-12-07 10:55:31,080 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2019-12-07 10:55:31,080 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2019-12-07 10:55:31,081 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-12-07 10:55:31,081 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-12-07 10:55:31,081 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-12-07 10:55:31,081 INFO L138 SettingsManager]: * sizeof long=4 [2019-12-07 10:55:31,081 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2019-12-07 10:55:31,082 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-12-07 10:55:31,082 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-12-07 10:55:31,082 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-12-07 10:55:31,082 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2019-12-07 10:55:31,082 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2019-12-07 10:55:31,082 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2019-12-07 10:55:31,083 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-12-07 10:55:31,083 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2019-12-07 10:55:31,083 INFO L138 SettingsManager]: * sizeof long double=12 [2019-12-07 10:55:31,083 INFO L138 SettingsManager]: * Use constant arrays=true [2019-12-07 10:55:31,083 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-12-07 10:55:31,083 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-12-07 10:55:31,084 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-12-07 10:55:31,084 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-12-07 10:55:31,084 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-12-07 10:55:31,084 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-12-07 10:55:31,084 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2019-12-07 10:55:31,084 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-12-07 10:55:31,085 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2019-12-07 10:55:31,085 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-12-07 10:55:31,085 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES 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_6fde4b4b-d27b-42ab-8075-a688758864ed/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 -> 016c9c68c49c3eaa925dd855e3c8f320ab9c50c9 [2019-12-07 10:55:31,184 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-12-07 10:55:31,194 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-12-07 10:55:31,197 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-12-07 10:55:31,198 INFO L271 PluginConnector]: Initializing CDTParser... [2019-12-07 10:55:31,198 INFO L275 PluginConnector]: CDTParser initialized [2019-12-07 10:55:31,199 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_6fde4b4b-d27b-42ab-8075-a688758864ed/bin/utaipan/../../sv-benchmarks/c/array-memsafety/reverse_array_alloca_unsafe.i [2019-12-07 10:55:31,244 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_6fde4b4b-d27b-42ab-8075-a688758864ed/bin/utaipan/data/125ad16ed/d1f7a7cf4e5c4be0916bb71ccde65b2a/FLAGab9fa7c7b [2019-12-07 10:55:31,650 INFO L306 CDTParser]: Found 1 translation units. [2019-12-07 10:55:31,651 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_6fde4b4b-d27b-42ab-8075-a688758864ed/sv-benchmarks/c/array-memsafety/reverse_array_alloca_unsafe.i [2019-12-07 10:55:31,661 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_6fde4b4b-d27b-42ab-8075-a688758864ed/bin/utaipan/data/125ad16ed/d1f7a7cf4e5c4be0916bb71ccde65b2a/FLAGab9fa7c7b [2019-12-07 10:55:32,027 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_6fde4b4b-d27b-42ab-8075-a688758864ed/bin/utaipan/data/125ad16ed/d1f7a7cf4e5c4be0916bb71ccde65b2a [2019-12-07 10:55:32,029 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-12-07 10:55:32,030 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2019-12-07 10:55:32,030 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-12-07 10:55:32,031 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-12-07 10:55:32,033 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-12-07 10:55:32,033 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.12 10:55:32" (1/1) ... [2019-12-07 10:55:32,036 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7c229e67 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 10:55:32, skipping insertion in model container [2019-12-07 10:55:32,036 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.12 10:55:32" (1/1) ... [2019-12-07 10:55:32,043 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2019-12-07 10:55:32,076 INFO L178 MainTranslator]: Built tables and reachable declarations [2019-12-07 10:55:32,293 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-12-07 10:55:32,298 INFO L203 MainTranslator]: Completed pre-run [2019-12-07 10:55:32,326 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-12-07 10:55:32,360 INFO L208 MainTranslator]: Completed translation [2019-12-07 10:55:32,361 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 10:55:32 WrapperNode [2019-12-07 10:55:32,361 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-12-07 10:55:32,362 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-12-07 10:55:32,362 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-12-07 10:55:32,362 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2019-12-07 10:55:32,367 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 10:55:32" (1/1) ... [2019-12-07 10:55:32,377 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 10:55:32" (1/1) ... [2019-12-07 10:55:32,392 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-12-07 10:55:32,392 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-12-07 10:55:32,392 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-12-07 10:55:32,393 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-12-07 10:55:32,398 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 10:55:32" (1/1) ... [2019-12-07 10:55:32,398 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 10:55:32" (1/1) ... [2019-12-07 10:55:32,401 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 10:55:32" (1/1) ... [2019-12-07 10:55:32,401 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 10:55:32" (1/1) ... [2019-12-07 10:55:32,405 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 10:55:32" (1/1) ... [2019-12-07 10:55:32,409 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 10:55:32" (1/1) ... [2019-12-07 10:55:32,410 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 10:55:32" (1/1) ... [2019-12-07 10:55:32,412 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-12-07 10:55:32,412 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-12-07 10:55:32,412 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-12-07 10:55:32,412 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-12-07 10:55:32,413 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 10:55:32" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_6fde4b4b-d27b-42ab-8075-a688758864ed/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 [2019-12-07 10:55:32,453 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-12-07 10:55:32,453 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-12-07 10:55:32,453 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-12-07 10:55:32,453 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-12-07 10:55:32,453 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-12-07 10:55:32,454 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-12-07 10:55:32,748 INFO L282 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-12-07 10:55:32,749 INFO L287 CfgBuilder]: Removed 7 assume(true) statements. [2019-12-07 10:55:32,749 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.12 10:55:32 BoogieIcfgContainer [2019-12-07 10:55:32,750 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-12-07 10:55:32,750 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-12-07 10:55:32,750 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-12-07 10:55:32,752 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-12-07 10:55:32,752 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.12 10:55:32" (1/3) ... [2019-12-07 10:55:32,753 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@693a78a5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.12 10:55:32, skipping insertion in model container [2019-12-07 10:55:32,753 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 10:55:32" (2/3) ... [2019-12-07 10:55:32,753 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@693a78a5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.12 10:55:32, skipping insertion in model container [2019-12-07 10:55:32,753 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.12 10:55:32" (3/3) ... [2019-12-07 10:55:32,755 INFO L109 eAbstractionObserver]: Analyzing ICFG reverse_array_alloca_unsafe.i [2019-12-07 10:55:32,761 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-12-07 10:55:32,766 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 23 error locations. [2019-12-07 10:55:32,773 INFO L249 AbstractCegarLoop]: Starting to check reachability of 23 error locations. [2019-12-07 10:55:32,787 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-12-07 10:55:32,787 INFO L374 AbstractCegarLoop]: Hoare is false [2019-12-07 10:55:32,787 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-12-07 10:55:32,787 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-12-07 10:55:32,787 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-12-07 10:55:32,787 INFO L378 AbstractCegarLoop]: Difference is false [2019-12-07 10:55:32,787 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-12-07 10:55:32,787 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-12-07 10:55:32,798 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states. [2019-12-07 10:55:32,803 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2019-12-07 10:55:32,803 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 10:55:32,804 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1] [2019-12-07 10:55:32,804 INFO L410 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr12REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr11REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr21REQUIRES_VIOLATION, ULTIMATE.startErr10REQUIRES_VIOLATION, ULTIMATE.startErr15REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr14REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr13REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr7REQUIRES_VIOLATION, ULTIMATE.startErr17REQUIRES_VIOLATION, ULTIMATE.startErr6REQUIRES_VIOLATION, ULTIMATE.startErr16REQUIRES_VIOLATION, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr20REQUIRES_VIOLATION, ULTIMATE.startErr9REQUIRES_VIOLATION, ULTIMATE.startErr19REQUIRES_VIOLATION, ULTIMATE.startErr8REQUIRES_VIOLATION, ULTIMATE.startErr18REQUIRES_VIOLATION, ULTIMATE.startErr22ASSERT_VIOLATIONMEMORY_LEAK]=== [2019-12-07 10:55:32,809 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 10:55:32,810 INFO L82 PathProgramCache]: Analyzing trace with hash 157381, now seen corresponding path program 1 times [2019-12-07 10:55:32,818 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-12-07 10:55:32,818 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1487018713] [2019-12-07 10:55:32,818 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 10:55:32,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 10:55:32,929 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 10:55:32,929 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1487018713] [2019-12-07 10:55:32,930 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-12-07 10:55:32,930 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2019-12-07 10:55:32,930 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1977373611] [2019-12-07 10:55:32,934 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-12-07 10:55:32,934 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-12-07 10:55:32,946 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-12-07 10:55:32,947 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-12-07 10:55:32,948 INFO L87 Difference]: Start difference. First operand 44 states. Second operand 3 states. [2019-12-07 10:55:32,995 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 10:55:32,995 INFO L93 Difference]: Finished difference Result 39 states and 43 transitions. [2019-12-07 10:55:32,996 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-12-07 10:55:32,996 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 3 [2019-12-07 10:55:32,997 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 10:55:33,002 INFO L225 Difference]: With dead ends: 39 [2019-12-07 10:55:33,003 INFO L226 Difference]: Without dead ends: 38 [2019-12-07 10:55:33,004 INFO L630 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 [2019-12-07 10:55:33,015 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2019-12-07 10:55:33,023 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2019-12-07 10:55:33,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2019-12-07 10:55:33,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 42 transitions. [2019-12-07 10:55:33,026 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 42 transitions. Word has length 3 [2019-12-07 10:55:33,026 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 10:55:33,026 INFO L462 AbstractCegarLoop]: Abstraction has 38 states and 42 transitions. [2019-12-07 10:55:33,026 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-12-07 10:55:33,026 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 42 transitions. [2019-12-07 10:55:33,026 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2019-12-07 10:55:33,026 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 10:55:33,026 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1] [2019-12-07 10:55:33,027 INFO L410 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr12REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr11REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr21REQUIRES_VIOLATION, ULTIMATE.startErr10REQUIRES_VIOLATION, ULTIMATE.startErr15REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr14REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr13REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr7REQUIRES_VIOLATION, ULTIMATE.startErr17REQUIRES_VIOLATION, ULTIMATE.startErr6REQUIRES_VIOLATION, ULTIMATE.startErr16REQUIRES_VIOLATION, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr20REQUIRES_VIOLATION, ULTIMATE.startErr9REQUIRES_VIOLATION, ULTIMATE.startErr19REQUIRES_VIOLATION, ULTIMATE.startErr8REQUIRES_VIOLATION, ULTIMATE.startErr18REQUIRES_VIOLATION, ULTIMATE.startErr22ASSERT_VIOLATIONMEMORY_LEAK]=== [2019-12-07 10:55:33,027 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 10:55:33,027 INFO L82 PathProgramCache]: Analyzing trace with hash 157382, now seen corresponding path program 1 times [2019-12-07 10:55:33,027 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-12-07 10:55:33,027 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [332987259] [2019-12-07 10:55:33,027 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 10:55:33,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 10:55:33,071 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 10:55:33,072 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [332987259] [2019-12-07 10:55:33,072 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-12-07 10:55:33,072 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-12-07 10:55:33,072 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [963974714] [2019-12-07 10:55:33,073 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-12-07 10:55:33,073 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-12-07 10:55:33,074 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-12-07 10:55:33,074 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-12-07 10:55:33,074 INFO L87 Difference]: Start difference. First operand 38 states and 42 transitions. Second operand 4 states. [2019-12-07 10:55:33,146 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 10:55:33,147 INFO L93 Difference]: Finished difference Result 40 states and 44 transitions. [2019-12-07 10:55:33,147 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-12-07 10:55:33,147 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 3 [2019-12-07 10:55:33,147 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 10:55:33,148 INFO L225 Difference]: With dead ends: 40 [2019-12-07 10:55:33,148 INFO L226 Difference]: Without dead ends: 40 [2019-12-07 10:55:33,149 INFO L630 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 [2019-12-07 10:55:33,149 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2019-12-07 10:55:33,153 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2019-12-07 10:55:33,153 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2019-12-07 10:55:33,154 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 44 transitions. [2019-12-07 10:55:33,154 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 44 transitions. Word has length 3 [2019-12-07 10:55:33,154 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 10:55:33,154 INFO L462 AbstractCegarLoop]: Abstraction has 40 states and 44 transitions. [2019-12-07 10:55:33,154 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-12-07 10:55:33,154 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 44 transitions. [2019-12-07 10:55:33,155 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2019-12-07 10:55:33,155 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 10:55:33,155 INFO L410 BasicCegarLoop]: trace histogram [2, 1, 1, 1] [2019-12-07 10:55:33,155 INFO L410 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr12REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr11REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr21REQUIRES_VIOLATION, ULTIMATE.startErr10REQUIRES_VIOLATION, ULTIMATE.startErr15REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr14REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr13REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr7REQUIRES_VIOLATION, ULTIMATE.startErr17REQUIRES_VIOLATION, ULTIMATE.startErr6REQUIRES_VIOLATION, ULTIMATE.startErr16REQUIRES_VIOLATION, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr20REQUIRES_VIOLATION, ULTIMATE.startErr9REQUIRES_VIOLATION, ULTIMATE.startErr19REQUIRES_VIOLATION, ULTIMATE.startErr8REQUIRES_VIOLATION, ULTIMATE.startErr18REQUIRES_VIOLATION, ULTIMATE.startErr22ASSERT_VIOLATIONMEMORY_LEAK]=== [2019-12-07 10:55:33,155 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 10:55:33,155 INFO L82 PathProgramCache]: Analyzing trace with hash 151338058, now seen corresponding path program 1 times [2019-12-07 10:55:33,156 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-12-07 10:55:33,156 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1989852720] [2019-12-07 10:55:33,156 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 10:55:33,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 10:55:33,206 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 10:55:33,207 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1989852720] [2019-12-07 10:55:33,207 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1404507573] [2019-12-07 10:55:33,207 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_6fde4b4b-d27b-42ab-8075-a688758864ed/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 [2019-12-07 10:55:33,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 10:55:33,237 INFO L264 TraceCheckSpWp]: Trace formula consists of 40 conjuncts, 11 conjunts are in the unsatisfiable core [2019-12-07 10:55:33,241 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 10:55:33,275 INFO L377 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 8 treesize of output 7 [2019-12-07 10:55:33,276 INFO L534 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-12-07 10:55:33,281 INFO L614 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-12-07 10:55:33,282 INFO L534 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-12-07 10:55:33,282 INFO L239 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:15, output treesize:14 [2019-12-07 10:55:33,313 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 10:55:33,313 INFO L329 TraceCheckSpWp]: Computing backward predicates... [2019-12-07 10:55:33,337 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-12-07 10:55:33,361 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 10:55:33,361 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1535384931] [2019-12-07 10:55:33,375 INFO L159 IcfgInterpreter]: Started Sifa with 4 locations of interest [2019-12-07 10:55:33,376 INFO L166 IcfgInterpreter]: Building call graph [2019-12-07 10:55:33,380 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-12-07 10:55:33,384 INFO L176 IcfgInterpreter]: Starting interpretation [2019-12-07 10:55:33,385 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-12-07 10:55:33,447 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 10:55:33,463 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 10:55:33,488 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 10:55:33,493 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 10:55:33,498 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 10:55:33,680 INFO L180 IcfgInterpreter]: Interpretation finished [2019-12-07 10:55:33,874 INFO L343 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-12-07 10:55:33,874 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-12-07 10:55:33,874 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 8 [2019-12-07 10:55:33,874 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [199294983] [2019-12-07 10:55:33,875 INFO L442 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-12-07 10:55:33,875 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-12-07 10:55:33,875 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-12-07 10:55:33,875 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=117, Unknown=0, NotChecked=0, Total=156 [2019-12-07 10:55:33,875 INFO L87 Difference]: Start difference. First operand 40 states and 44 transitions. Second operand 10 states. [2019-12-07 10:55:34,008 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 10:55:34,008 INFO L93 Difference]: Finished difference Result 39 states and 43 transitions. [2019-12-07 10:55:34,008 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-12-07 10:55:34,008 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 5 [2019-12-07 10:55:34,009 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 10:55:34,009 INFO L225 Difference]: With dead ends: 39 [2019-12-07 10:55:34,010 INFO L226 Difference]: Without dead ends: 39 [2019-12-07 10:55:34,010 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=57, Invalid=153, Unknown=0, NotChecked=0, Total=210 [2019-12-07 10:55:34,011 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2019-12-07 10:55:34,013 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 38. [2019-12-07 10:55:34,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2019-12-07 10:55:34,014 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 42 transitions. [2019-12-07 10:55:34,014 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 42 transitions. Word has length 5 [2019-12-07 10:55:34,015 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 10:55:34,015 INFO L462 AbstractCegarLoop]: Abstraction has 38 states and 42 transitions. [2019-12-07 10:55:34,015 INFO L463 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-12-07 10:55:34,015 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 42 transitions. [2019-12-07 10:55:34,015 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2019-12-07 10:55:34,015 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 10:55:34,015 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2019-12-07 10:55:34,216 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 10:55:34,217 INFO L410 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr12REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr11REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr21REQUIRES_VIOLATION, ULTIMATE.startErr10REQUIRES_VIOLATION, ULTIMATE.startErr15REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr14REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr13REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr7REQUIRES_VIOLATION, ULTIMATE.startErr17REQUIRES_VIOLATION, ULTIMATE.startErr6REQUIRES_VIOLATION, ULTIMATE.startErr16REQUIRES_VIOLATION, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr20REQUIRES_VIOLATION, ULTIMATE.startErr9REQUIRES_VIOLATION, ULTIMATE.startErr19REQUIRES_VIOLATION, ULTIMATE.startErr8REQUIRES_VIOLATION, ULTIMATE.startErr18REQUIRES_VIOLATION, ULTIMATE.startErr22ASSERT_VIOLATIONMEMORY_LEAK]=== [2019-12-07 10:55:34,217 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 10:55:34,218 INFO L82 PathProgramCache]: Analyzing trace with hash 396616665, now seen corresponding path program 1 times [2019-12-07 10:55:34,218 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-12-07 10:55:34,219 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [964420693] [2019-12-07 10:55:34,220 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 10:55:34,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 10:55:34,316 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 10:55:34,316 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [964420693] [2019-12-07 10:55:34,316 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-12-07 10:55:34,316 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-12-07 10:55:34,316 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1123976659] [2019-12-07 10:55:34,317 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-12-07 10:55:34,317 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-12-07 10:55:34,317 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-12-07 10:55:34,317 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2019-12-07 10:55:34,317 INFO L87 Difference]: Start difference. First operand 38 states and 42 transitions. Second operand 6 states. [2019-12-07 10:55:34,364 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 10:55:34,365 INFO L93 Difference]: Finished difference Result 47 states and 52 transitions. [2019-12-07 10:55:34,365 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-12-07 10:55:34,365 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 6 [2019-12-07 10:55:34,365 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 10:55:34,366 INFO L225 Difference]: With dead ends: 47 [2019-12-07 10:55:34,366 INFO L226 Difference]: Without dead ends: 47 [2019-12-07 10:55:34,366 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 0 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2019-12-07 10:55:34,366 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2019-12-07 10:55:34,368 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 39. [2019-12-07 10:55:34,368 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2019-12-07 10:55:34,369 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 43 transitions. [2019-12-07 10:55:34,369 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 43 transitions. Word has length 6 [2019-12-07 10:55:34,369 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 10:55:34,369 INFO L462 AbstractCegarLoop]: Abstraction has 39 states and 43 transitions. [2019-12-07 10:55:34,369 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-12-07 10:55:34,369 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 43 transitions. [2019-12-07 10:55:34,369 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2019-12-07 10:55:34,369 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 10:55:34,370 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2019-12-07 10:55:34,370 INFO L410 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr12REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr11REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr21REQUIRES_VIOLATION, ULTIMATE.startErr10REQUIRES_VIOLATION, ULTIMATE.startErr15REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr14REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr13REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr7REQUIRES_VIOLATION, ULTIMATE.startErr17REQUIRES_VIOLATION, ULTIMATE.startErr6REQUIRES_VIOLATION, ULTIMATE.startErr16REQUIRES_VIOLATION, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr20REQUIRES_VIOLATION, ULTIMATE.startErr9REQUIRES_VIOLATION, ULTIMATE.startErr19REQUIRES_VIOLATION, ULTIMATE.startErr8REQUIRES_VIOLATION, ULTIMATE.startErr18REQUIRES_VIOLATION, ULTIMATE.startErr22ASSERT_VIOLATIONMEMORY_LEAK]=== [2019-12-07 10:55:34,370 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 10:55:34,370 INFO L82 PathProgramCache]: Analyzing trace with hash 396613916, now seen corresponding path program 1 times [2019-12-07 10:55:34,370 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-12-07 10:55:34,370 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [443768706] [2019-12-07 10:55:34,370 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 10:55:34,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 10:55:34,407 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 10:55:34,407 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [443768706] [2019-12-07 10:55:34,407 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-12-07 10:55:34,407 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-12-07 10:55:34,407 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1790392746] [2019-12-07 10:55:34,408 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-12-07 10:55:34,408 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-12-07 10:55:34,408 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-12-07 10:55:34,408 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2019-12-07 10:55:34,408 INFO L87 Difference]: Start difference. First operand 39 states and 43 transitions. Second operand 5 states. [2019-12-07 10:55:34,449 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 10:55:34,449 INFO L93 Difference]: Finished difference Result 44 states and 49 transitions. [2019-12-07 10:55:34,450 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-12-07 10:55:34,450 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 6 [2019-12-07 10:55:34,450 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 10:55:34,450 INFO L225 Difference]: With dead ends: 44 [2019-12-07 10:55:34,450 INFO L226 Difference]: Without dead ends: 44 [2019-12-07 10:55:34,450 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2019-12-07 10:55:34,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2019-12-07 10:55:34,452 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2019-12-07 10:55:34,452 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2019-12-07 10:55:34,453 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 48 transitions. [2019-12-07 10:55:34,453 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 48 transitions. Word has length 6 [2019-12-07 10:55:34,453 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 10:55:34,453 INFO L462 AbstractCegarLoop]: Abstraction has 43 states and 48 transitions. [2019-12-07 10:55:34,453 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-12-07 10:55:34,453 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 48 transitions. [2019-12-07 10:55:34,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-12-07 10:55:34,454 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 10:55:34,454 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-12-07 10:55:34,454 INFO L410 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr12REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr11REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr21REQUIRES_VIOLATION, ULTIMATE.startErr10REQUIRES_VIOLATION, ULTIMATE.startErr15REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr14REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr13REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr7REQUIRES_VIOLATION, ULTIMATE.startErr17REQUIRES_VIOLATION, ULTIMATE.startErr6REQUIRES_VIOLATION, ULTIMATE.startErr16REQUIRES_VIOLATION, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr20REQUIRES_VIOLATION, ULTIMATE.startErr9REQUIRES_VIOLATION, ULTIMATE.startErr19REQUIRES_VIOLATION, ULTIMATE.startErr8REQUIRES_VIOLATION, ULTIMATE.startErr18REQUIRES_VIOLATION, ULTIMATE.startErr22ASSERT_VIOLATIONMEMORY_LEAK]=== [2019-12-07 10:55:34,454 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 10:55:34,454 INFO L82 PathProgramCache]: Analyzing trace with hash -2120707428, now seen corresponding path program 1 times [2019-12-07 10:55:34,454 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-12-07 10:55:34,454 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [829233376] [2019-12-07 10:55:34,454 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 10:55:34,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-12-07 10:55:34,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-12-07 10:55:34,496 INFO L174 FreeRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2019-12-07 10:55:34,496 INFO L475 BasicCegarLoop]: Counterexample might be feasible [2019-12-07 10:55:34,512 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 07.12 10:55:34 BoogieIcfgContainer [2019-12-07 10:55:34,512 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2019-12-07 10:55:34,512 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2019-12-07 10:55:34,512 INFO L271 PluginConnector]: Initializing Witness Printer... [2019-12-07 10:55:34,512 INFO L275 PluginConnector]: Witness Printer initialized [2019-12-07 10:55:34,513 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.12 10:55:32" (3/4) ... [2019-12-07 10:55:34,514 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2019-12-07 10:55:34,542 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_6fde4b4b-d27b-42ab-8075-a688758864ed/bin/utaipan/witness.graphml [2019-12-07 10:55:34,542 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2019-12-07 10:55:34,543 INFO L168 Benchmark]: Toolchain (without parser) took 2513.67 ms. Allocated memory was 1.0 GB in the beginning and 1.1 GB in the end (delta: 110.6 MB). Free memory was 940.8 MB in the beginning and 1.1 GB in the end (delta: -118.6 MB). There was no memory consumed. Max. memory is 11.5 GB. [2019-12-07 10:55:34,543 INFO L168 Benchmark]: CDTParser took 0.17 ms. Allocated memory is still 1.0 GB. Free memory is still 961.3 MB. There was no memory consumed. Max. memory is 11.5 GB. [2019-12-07 10:55:34,544 INFO L168 Benchmark]: CACSL2BoogieTranslator took 330.83 ms. Allocated memory was 1.0 GB in the beginning and 1.1 GB in the end (delta: 110.6 MB). Free memory was 940.8 MB in the beginning and 1.1 GB in the end (delta: -152.8 MB). Peak memory consumption was 17.9 MB. Max. memory is 11.5 GB. [2019-12-07 10:55:34,544 INFO L168 Benchmark]: Boogie Procedure Inliner took 30.69 ms. Allocated memory is still 1.1 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB. [2019-12-07 10:55:34,544 INFO L168 Benchmark]: Boogie Preprocessor took 19.42 ms. Allocated memory is still 1.1 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 5.4 MB). Peak memory consumption was 5.4 MB. Max. memory is 11.5 GB. [2019-12-07 10:55:34,545 INFO L168 Benchmark]: RCFGBuilder took 337.67 ms. Allocated memory is still 1.1 GB. Free memory was 1.1 GB in the beginning and 1.0 GB in the end (delta: 39.1 MB). Peak memory consumption was 39.1 MB. Max. memory is 11.5 GB. [2019-12-07 10:55:34,545 INFO L168 Benchmark]: TraceAbstraction took 1761.94 ms. Allocated memory is still 1.1 GB. Free memory was 1.0 GB in the beginning and 1.1 GB in the end (delta: -17.2 MB). There was no memory consumed. Max. memory is 11.5 GB. [2019-12-07 10:55:34,545 INFO L168 Benchmark]: Witness Printer took 30.05 ms. Allocated memory is still 1.1 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 6.9 MB). Peak memory consumption was 6.9 MB. Max. memory is 11.5 GB. [2019-12-07 10:55:34,547 INFO L335 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 1.0 GB. Free memory is still 961.3 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 330.83 ms. Allocated memory was 1.0 GB in the beginning and 1.1 GB in the end (delta: 110.6 MB). Free memory was 940.8 MB in the beginning and 1.1 GB in the end (delta: -152.8 MB). Peak memory consumption was 17.9 MB. Max. memory is 11.5 GB. * Boogie Procedure Inliner took 30.69 ms. Allocated memory is still 1.1 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB. * Boogie Preprocessor took 19.42 ms. Allocated memory is still 1.1 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 5.4 MB). Peak memory consumption was 5.4 MB. Max. memory is 11.5 GB. * RCFGBuilder took 337.67 ms. Allocated memory is still 1.1 GB. Free memory was 1.1 GB in the beginning and 1.0 GB in the end (delta: 39.1 MB). Peak memory consumption was 39.1 MB. Max. memory is 11.5 GB. * TraceAbstraction took 1761.94 ms. Allocated memory is still 1.1 GB. Free memory was 1.0 GB in the beginning and 1.1 GB in the end (delta: -17.2 MB). There was no memory consumed. Max. memory is 11.5 GB. * Witness Printer took 30.05 ms. Allocated memory is still 1.1 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 6.9 MB). Peak memory consumption was 6.9 MB. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 529]: pointer dereference may fail pointer dereference may fail We found a FailurePath: [L515] int i, j, tmp; [L516] int length = __VERIFIER_nondet_int(); [L517] COND FALSE !(length < 1) [L518] COND FALSE !(length % 2 == 0) [L519] int *arr = __builtin_alloca (length*sizeof(int)); [L521] int i = 0; [L521] COND TRUE i < length [L523] arr[i] = __VERIFIER_nondet_int() [L521] i++ [L521] COND FALSE !(i < length) [L526] i=0 [L526] COND TRUE i