./Ultimate.py --spec ../sv-benchmarks/c/properties/valid-memsafety.prp --file ../sv-benchmarks/c/verifythis/elimination_max_rec.c --full-output --architecture 64bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 6b5699aa Using bit-precise analysis Retrying with bit-precise analysis Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx12G -Xms1G -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.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/verifythis/elimination_max_rec.c -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-DerefFreeMemtrack-64bit-Automizer_Bitvector.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 64bit --witnessprinter.graph.data.programhash 17d20a29a9e9cc6560e9aa0daac36f5de29f992c .................................................................................................................................................................................................................................................................................................................................................................................................................................................... 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 --- Skipped default analysis because property is memsafety ### Bit-precise run ### This is Ultimate 0.1.24-6b5699a [2019-11-21 21:32:04,657 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-21 21:32:04,660 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-21 21:32:04,679 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-21 21:32:04,680 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-21 21:32:04,682 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-21 21:32:04,685 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-21 21:32:04,695 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-21 21:32:04,701 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-21 21:32:04,704 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-21 21:32:04,705 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-21 21:32:04,708 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-21 21:32:04,708 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-21 21:32:04,712 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-21 21:32:04,715 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-21 21:32:04,717 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-21 21:32:04,719 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-21 21:32:04,720 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-21 21:32:04,723 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-21 21:32:04,728 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-21 21:32:04,733 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-21 21:32:04,738 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-21 21:32:04,739 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-21 21:32:04,741 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-21 21:32:04,745 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-11-21 21:32:04,746 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-11-21 21:32:04,746 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-11-21 21:32:04,748 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-11-21 21:32:04,749 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-11-21 21:32:04,750 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-11-21 21:32:04,750 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-11-21 21:32:04,751 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-11-21 21:32:04,756 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-11-21 21:32:04,756 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-11-21 21:32:04,758 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-11-21 21:32:04,758 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-11-21 21:32:04,759 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-11-21 21:32:04,759 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-11-21 21:32:04,759 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-21 21:32:04,760 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-21 21:32:04,761 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-21 21:32:04,762 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-DerefFreeMemtrack-64bit-Automizer_Bitvector.epf [2019-11-21 21:32:04,777 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-21 21:32:04,777 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-21 21:32:04,778 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-21 21:32:04,779 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-21 21:32:04,782 INFO L138 SettingsManager]: * Use SBE=true [2019-11-21 21:32:04,782 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-21 21:32:04,783 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2019-11-21 21:32:04,783 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-21 21:32:04,783 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-21 21:32:04,784 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2019-11-21 21:32:04,784 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2019-11-21 21:32:04,784 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2019-11-21 21:32:04,784 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-21 21:32:04,785 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2019-11-21 21:32:04,785 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2019-11-21 21:32:04,785 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2019-11-21 21:32:04,785 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-21 21:32:04,786 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-21 21:32:04,786 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-21 21:32:04,786 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-21 21:32:04,786 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-21 21:32:04,787 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-21 21:32:04,787 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-21 21:32:04,787 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-21 21:32:04,787 INFO L138 SettingsManager]: * Trace refinement strategy=WOLF [2019-11-21 21:32:04,788 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --rewrite-divk --print-success --lang smt [2019-11-21 21:32:04,788 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-11-21 21:32:04,788 INFO L138 SettingsManager]: * Logic for external solver=AUFBV 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 -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 17d20a29a9e9cc6560e9aa0daac36f5de29f992c [2019-11-21 21:32:05,138 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-21 21:32:05,153 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-21 21:32:05,157 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-21 21:32:05,158 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-21 21:32:05,159 INFO L275 PluginConnector]: CDTParser initialized [2019-11-21 21:32:05,160 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/verifythis/elimination_max_rec.c [2019-11-21 21:32:05,219 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0b8481531/5d2547efc11446a091c06f50a6b38dbe/FLAG05a541d22 [2019-11-21 21:32:05,746 INFO L306 CDTParser]: Found 1 translation units. [2019-11-21 21:32:05,748 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/verifythis/elimination_max_rec.c [2019-11-21 21:32:05,758 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0b8481531/5d2547efc11446a091c06f50a6b38dbe/FLAG05a541d22 [2019-11-21 21:32:06,079 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0b8481531/5d2547efc11446a091c06f50a6b38dbe [2019-11-21 21:32:06,083 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-21 21:32:06,087 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2019-11-21 21:32:06,088 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-21 21:32:06,088 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-21 21:32:06,092 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-21 21:32:06,093 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 09:32:06" (1/1) ... [2019-11-21 21:32:06,097 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@182ffbb3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 09:32:06, skipping insertion in model container [2019-11-21 21:32:06,097 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 09:32:06" (1/1) ... [2019-11-21 21:32:06,105 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2019-11-21 21:32:06,124 INFO L179 MainTranslator]: Built tables and reachable declarations [2019-11-21 21:32:06,376 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-21 21:32:06,396 INFO L201 MainTranslator]: Completed pre-run [2019-11-21 21:32:06,440 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-21 21:32:06,546 INFO L205 MainTranslator]: Completed translation [2019-11-21 21:32:06,546 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 09:32:06 WrapperNode [2019-11-21 21:32:06,547 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-21 21:32:06,547 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-21 21:32:06,548 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-21 21:32:06,548 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-21 21:32:06,563 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 09:32:06" (1/1) ... [2019-11-21 21:32:06,563 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 09:32:06" (1/1) ... [2019-11-21 21:32:06,588 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 09:32:06" (1/1) ... [2019-11-21 21:32:06,589 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 09:32:06" (1/1) ... [2019-11-21 21:32:06,609 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 09:32:06" (1/1) ... [2019-11-21 21:32:06,611 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 09:32:06" (1/1) ... [2019-11-21 21:32:06,613 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 09:32:06" (1/1) ... [2019-11-21 21:32:06,616 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-21 21:32:06,617 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-21 21:32:06,617 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-21 21:32:06,618 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-21 21:32:06,619 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 09:32:06" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/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 [2019-11-21 21:32:06,670 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-21 21:32:06,670 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-21 21:32:06,670 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-11-21 21:32:06,671 INFO L138 BoogieDeclarations]: Found implementation of procedure check [2019-11-21 21:32:06,671 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-21 21:32:06,671 INFO L138 BoogieDeclarations]: Found implementation of procedure #Ultimate.meminit [2019-11-21 21:32:06,671 INFO L130 BoogieDeclarations]: Found specification of procedure calloc [2019-11-21 21:32:06,671 INFO L130 BoogieDeclarations]: Found specification of procedure free [2019-11-21 21:32:06,672 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-21 21:32:06,672 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assume [2019-11-21 21:32:06,672 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-11-21 21:32:06,672 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-11-21 21:32:06,672 INFO L130 BoogieDeclarations]: Found specification of procedure check [2019-11-21 21:32:06,673 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE4 [2019-11-21 21:32:06,673 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-21 21:32:06,673 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2019-11-21 21:32:06,673 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.meminit [2019-11-21 21:32:06,674 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-21 21:32:06,674 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-21 21:32:06,674 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-21 21:32:06,674 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE4 [2019-11-21 21:32:07,139 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-21 21:32:07,140 INFO L284 CfgBuilder]: Removed 0 assume(true) statements. [2019-11-21 21:32:07,141 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 09:32:07 BoogieIcfgContainer [2019-11-21 21:32:07,141 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-21 21:32:07,146 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-21 21:32:07,146 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-21 21:32:07,150 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-21 21:32:07,150 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 09:32:06" (1/3) ... [2019-11-21 21:32:07,151 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@27903aff and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 09:32:07, skipping insertion in model container [2019-11-21 21:32:07,151 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 09:32:06" (2/3) ... [2019-11-21 21:32:07,152 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@27903aff and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 09:32:07, skipping insertion in model container [2019-11-21 21:32:07,152 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 09:32:07" (3/3) ... [2019-11-21 21:32:07,154 INFO L109 eAbstractionObserver]: Analyzing ICFG elimination_max_rec.c [2019-11-21 21:32:07,163 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-21 21:32:07,171 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 12 error locations. [2019-11-21 21:32:07,184 INFO L249 AbstractCegarLoop]: Starting to check reachability of 12 error locations. [2019-11-21 21:32:07,206 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-21 21:32:07,206 INFO L374 AbstractCegarLoop]: Hoare is false [2019-11-21 21:32:07,207 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-21 21:32:07,207 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-21 21:32:07,207 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-21 21:32:07,207 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-21 21:32:07,207 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-21 21:32:07,207 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-21 21:32:07,225 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states. [2019-11-21 21:32:07,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2019-11-21 21:32:07,235 INFO L402 BasicCegarLoop]: Found error trace [2019-11-21 21:32:07,236 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-21 21:32:07,237 INFO L410 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONMEMORY_FREE, mainErr2ASSERT_VIOLATIONMEMORY_FREE, mainErr3ENSURES_VIOLATIONMEMORY_LEAK, mainErr1ASSERT_VIOLATIONMEMORY_FREE, checkErr2REQUIRES_VIOLATION, checkErr3REQUIRES_VIOLATION, checkErr4REQUIRES_VIOLATION, checkErr5REQUIRES_VIOLATION, checkErr0REQUIRES_VIOLATION, checkErr6REQUIRES_VIOLATION, checkErr1REQUIRES_VIOLATION, checkErr7REQUIRES_VIOLATION]=== [2019-11-21 21:32:07,242 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-21 21:32:07,242 INFO L82 PathProgramCache]: Analyzing trace with hash -1758189684, now seen corresponding path program 1 times [2019-11-21 21:32:07,251 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-21 21:32:07,252 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [1611683264] [2019-11-21 21:32:07,252 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 2 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-21 21:32:07,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-21 21:32:07,387 INFO L255 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-21 21:32:07,395 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-21 21:32:07,448 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-21 21:32:07,448 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-21 21:32:07,474 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-21 21:32:07,475 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1611683264] [2019-11-21 21:32:07,476 INFO L220 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-11-21 21:32:07,476 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2019-11-21 21:32:07,479 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1611746864] [2019-11-21 21:32:07,485 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-21 21:32:07,485 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-11-21 21:32:07,499 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-21 21:32:07,500 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-11-21 21:32:07,502 INFO L87 Difference]: Start difference. First operand 53 states. Second operand 4 states. [2019-11-21 21:32:07,556 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-21 21:32:07,556 INFO L93 Difference]: Finished difference Result 52 states and 55 transitions. [2019-11-21 21:32:07,556 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-21 21:32:07,558 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 18 [2019-11-21 21:32:07,559 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-21 21:32:07,569 INFO L225 Difference]: With dead ends: 52 [2019-11-21 21:32:07,569 INFO L226 Difference]: Without dead ends: 49 [2019-11-21 21:32:07,571 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2019-11-21 21:32:07,590 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2019-11-21 21:32:07,611 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2019-11-21 21:32:07,612 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2019-11-21 21:32:07,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 52 transitions. [2019-11-21 21:32:07,615 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 52 transitions. Word has length 18 [2019-11-21 21:32:07,617 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-21 21:32:07,617 INFO L462 AbstractCegarLoop]: Abstraction has 49 states and 52 transitions. [2019-11-21 21:32:07,618 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-21 21:32:07,618 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 52 transitions. [2019-11-21 21:32:07,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2019-11-21 21:32:07,620 INFO L402 BasicCegarLoop]: Found error trace [2019-11-21 21:32:07,620 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-21 21:32:07,822 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-21 21:32:07,823 INFO L410 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONMEMORY_FREE, mainErr2ASSERT_VIOLATIONMEMORY_FREE, mainErr3ENSURES_VIOLATIONMEMORY_LEAK, mainErr1ASSERT_VIOLATIONMEMORY_FREE, checkErr2REQUIRES_VIOLATION, checkErr3REQUIRES_VIOLATION, checkErr4REQUIRES_VIOLATION, checkErr5REQUIRES_VIOLATION, checkErr0REQUIRES_VIOLATION, checkErr6REQUIRES_VIOLATION, checkErr1REQUIRES_VIOLATION, checkErr7REQUIRES_VIOLATION]=== [2019-11-21 21:32:07,824 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-21 21:32:07,824 INFO L82 PathProgramCache]: Analyzing trace with hash 1330694682, now seen corresponding path program 1 times [2019-11-21 21:32:07,825 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-21 21:32:07,825 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [970350183] [2019-11-21 21:32:07,826 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 3 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-21 21:32:07,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-21 21:32:07,933 INFO L255 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-21 21:32:07,935 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-21 21:32:08,011 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-21 21:32:08,012 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-21 21:32:08,074 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-21 21:32:08,075 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [970350183] [2019-11-21 21:32:08,075 INFO L220 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-11-21 21:32:08,075 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 3] imperfect sequences [] total 6 [2019-11-21 21:32:08,075 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [699481525] [2019-11-21 21:32:08,080 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-11-21 21:32:08,081 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-11-21 21:32:08,081 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-11-21 21:32:08,083 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2019-11-21 21:32:08,083 INFO L87 Difference]: Start difference. First operand 49 states and 52 transitions. Second operand 7 states. [2019-11-21 21:32:08,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-21 21:32:08,279 INFO L93 Difference]: Finished difference Result 48 states and 51 transitions. [2019-11-21 21:32:08,281 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-11-21 21:32:08,282 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 19 [2019-11-21 21:32:08,282 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-21 21:32:08,283 INFO L225 Difference]: With dead ends: 48 [2019-11-21 21:32:08,283 INFO L226 Difference]: Without dead ends: 48 [2019-11-21 21:32:08,285 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 30 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2019-11-21 21:32:08,286 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2019-11-21 21:32:08,292 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2019-11-21 21:32:08,292 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2019-11-21 21:32:08,294 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 51 transitions. [2019-11-21 21:32:08,295 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 51 transitions. Word has length 19 [2019-11-21 21:32:08,295 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-21 21:32:08,295 INFO L462 AbstractCegarLoop]: Abstraction has 48 states and 51 transitions. [2019-11-21 21:32:08,295 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-11-21 21:32:08,296 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 51 transitions. [2019-11-21 21:32:08,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-11-21 21:32:08,297 INFO L402 BasicCegarLoop]: Found error trace [2019-11-21 21:32:08,297 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-21 21:32:08,499 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-21 21:32:08,500 INFO L410 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONMEMORY_FREE, mainErr2ASSERT_VIOLATIONMEMORY_FREE, mainErr3ENSURES_VIOLATIONMEMORY_LEAK, mainErr1ASSERT_VIOLATIONMEMORY_FREE, checkErr2REQUIRES_VIOLATION, checkErr3REQUIRES_VIOLATION, checkErr4REQUIRES_VIOLATION, checkErr5REQUIRES_VIOLATION, checkErr0REQUIRES_VIOLATION, checkErr6REQUIRES_VIOLATION, checkErr1REQUIRES_VIOLATION, checkErr7REQUIRES_VIOLATION]=== [2019-11-21 21:32:08,501 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-21 21:32:08,501 INFO L82 PathProgramCache]: Analyzing trace with hash -1698137778, now seen corresponding path program 1 times [2019-11-21 21:32:08,502 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-21 21:32:08,503 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [930352971] [2019-11-21 21:32:08,503 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 4 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-21 21:32:08,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-21 21:32:08,606 INFO L255 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-21 21:32:08,608 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-21 21:32:08,647 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 6 treesize of output 5 [2019-11-21 21:32:08,648 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-21 21:32:08,652 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-21 21:32:08,652 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-21 21:32:08,653 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:6, output treesize:5 [2019-11-21 21:32:08,740 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-21 21:32:08,741 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-21 21:32:08,768 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-21 21:32:08,769 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [930352971] [2019-11-21 21:32:08,769 INFO L220 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-11-21 21:32:08,770 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 3] imperfect sequences [] total 4 [2019-11-21 21:32:08,770 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2019650755] [2019-11-21 21:32:08,770 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-11-21 21:32:08,772 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-11-21 21:32:08,772 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-11-21 21:32:08,772 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2019-11-21 21:32:08,772 INFO L87 Difference]: Start difference. First operand 48 states and 51 transitions. Second operand 5 states. [2019-11-21 21:32:08,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-21 21:32:08,951 INFO L93 Difference]: Finished difference Result 47 states and 50 transitions. [2019-11-21 21:32:08,952 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-11-21 21:32:08,952 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 20 [2019-11-21 21:32:08,953 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-21 21:32:08,954 INFO L225 Difference]: With dead ends: 47 [2019-11-21 21:32:08,954 INFO L226 Difference]: Without dead ends: 47 [2019-11-21 21:32:08,954 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 32 SyntacticMatches, 4 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2019-11-21 21:32:08,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2019-11-21 21:32:08,960 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2019-11-21 21:32:08,960 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2019-11-21 21:32:08,961 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 50 transitions. [2019-11-21 21:32:08,962 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 50 transitions. Word has length 20 [2019-11-21 21:32:08,962 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-21 21:32:08,962 INFO L462 AbstractCegarLoop]: Abstraction has 47 states and 50 transitions. [2019-11-21 21:32:08,962 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-11-21 21:32:08,963 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 50 transitions. [2019-11-21 21:32:08,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2019-11-21 21:32:08,964 INFO L402 BasicCegarLoop]: Found error trace [2019-11-21 21:32:08,964 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-21 21:32:09,174 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-21 21:32:09,175 INFO L410 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONMEMORY_FREE, mainErr2ASSERT_VIOLATIONMEMORY_FREE, mainErr3ENSURES_VIOLATIONMEMORY_LEAK, mainErr1ASSERT_VIOLATIONMEMORY_FREE, checkErr2REQUIRES_VIOLATION, checkErr3REQUIRES_VIOLATION, checkErr4REQUIRES_VIOLATION, checkErr5REQUIRES_VIOLATION, checkErr0REQUIRES_VIOLATION, checkErr6REQUIRES_VIOLATION, checkErr1REQUIRES_VIOLATION, checkErr7REQUIRES_VIOLATION]=== [2019-11-21 21:32:09,175 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-21 21:32:09,175 INFO L82 PathProgramCache]: Analyzing trace with hash 886846262, now seen corresponding path program 1 times [2019-11-21 21:32:09,176 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-21 21:32:09,176 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [1359225041] [2019-11-21 21:32:09,176 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 5 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-21 21:32:09,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-21 21:32:09,288 INFO L255 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 5 conjunts are in the unsatisfiable core [2019-11-21 21:32:09,290 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-21 21:32:09,300 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 6 treesize of output 5 [2019-11-21 21:32:09,300 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-21 21:32:09,306 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-21 21:32:09,306 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-21 21:32:09,306 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:6, output treesize:5 [2019-11-21 21:32:09,384 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-21 21:32:09,384 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-21 21:32:09,406 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-21 21:32:09,406 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1359225041] [2019-11-21 21:32:09,406 INFO L220 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-11-21 21:32:09,407 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6, 5] imperfect sequences [] total 6 [2019-11-21 21:32:09,407 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1335950338] [2019-11-21 21:32:09,407 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-11-21 21:32:09,408 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-11-21 21:32:09,408 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-11-21 21:32:09,408 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2019-11-21 21:32:09,408 INFO L87 Difference]: Start difference. First operand 47 states and 50 transitions. Second operand 7 states. [2019-11-21 21:32:09,673 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-21 21:32:09,673 INFO L93 Difference]: Finished difference Result 43 states and 46 transitions. [2019-11-21 21:32:09,674 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-11-21 21:32:09,675 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 21 [2019-11-21 21:32:09,676 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-21 21:32:09,677 INFO L225 Difference]: With dead ends: 43 [2019-11-21 21:32:09,677 INFO L226 Difference]: Without dead ends: 43 [2019-11-21 21:32:09,678 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 32 SyntacticMatches, 4 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=25, Invalid=47, Unknown=0, NotChecked=0, Total=72 [2019-11-21 21:32:09,678 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2019-11-21 21:32:09,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2019-11-21 21:32:09,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2019-11-21 21:32:09,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 46 transitions. [2019-11-21 21:32:09,685 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 46 transitions. Word has length 21 [2019-11-21 21:32:09,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-21 21:32:09,685 INFO L462 AbstractCegarLoop]: Abstraction has 43 states and 46 transitions. [2019-11-21 21:32:09,686 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-11-21 21:32:09,686 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 46 transitions. [2019-11-21 21:32:09,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2019-11-21 21:32:09,687 INFO L402 BasicCegarLoop]: Found error trace [2019-11-21 21:32:09,687 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-21 21:32:09,898 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-21 21:32:09,898 INFO L410 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONMEMORY_FREE, mainErr2ASSERT_VIOLATIONMEMORY_FREE, mainErr3ENSURES_VIOLATIONMEMORY_LEAK, mainErr1ASSERT_VIOLATIONMEMORY_FREE, checkErr2REQUIRES_VIOLATION, checkErr3REQUIRES_VIOLATION, checkErr4REQUIRES_VIOLATION, checkErr5REQUIRES_VIOLATION, checkErr0REQUIRES_VIOLATION, checkErr6REQUIRES_VIOLATION, checkErr1REQUIRES_VIOLATION, checkErr7REQUIRES_VIOLATION]=== [2019-11-21 21:32:09,899 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-21 21:32:09,899 INFO L82 PathProgramCache]: Analyzing trace with hash 886846263, now seen corresponding path program 1 times [2019-11-21 21:32:09,899 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-21 21:32:09,900 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [993837171] [2019-11-21 21:32:09,900 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 6 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-21 21:32:10,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-11-21 21:32:10,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-11-21 21:32:10,268 INFO L174 FreeRefinementEngine]: Strategy WOLF found a feasible trace [2019-11-21 21:32:10,268 INFO L475 BasicCegarLoop]: Counterexample might be feasible [2019-11-21 21:32:10,472 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-21 21:32:10,499 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.11 09:32:10 BoogieIcfgContainer [2019-11-21 21:32:10,499 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2019-11-21 21:32:10,500 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2019-11-21 21:32:10,500 INFO L271 PluginConnector]: Initializing Witness Printer... [2019-11-21 21:32:10,500 INFO L275 PluginConnector]: Witness Printer initialized [2019-11-21 21:32:10,501 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 09:32:07" (3/4) ... [2019-11-21 21:32:10,503 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2019-11-21 21:32:10,551 INFO L141 WitnessManager]: Wrote witness to /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/witness.graphml [2019-11-21 21:32:10,551 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2019-11-21 21:32:10,553 INFO L168 Benchmark]: Toolchain (without parser) took 4468.32 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 159.4 MB). Free memory was 951.0 MB in the beginning and 958.8 MB in the end (delta: -7.8 MB). Peak memory consumption was 151.6 MB. Max. memory is 11.5 GB. [2019-11-21 21:32:10,554 INFO L168 Benchmark]: CDTParser took 0.33 ms. Allocated memory is still 1.0 GB. Free memory is still 981.8 MB. There was no memory consumed. Max. memory is 11.5 GB. [2019-11-21 21:32:10,555 INFO L168 Benchmark]: CACSL2BoogieTranslator took 459.00 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 159.4 MB). Free memory was 951.0 MB in the beginning and 1.2 GB in the end (delta: -204.7 MB). Peak memory consumption was 20.6 MB. Max. memory is 11.5 GB. [2019-11-21 21:32:10,556 INFO L168 Benchmark]: Boogie Preprocessor took 69.41 ms. Allocated memory is still 1.2 GB. Free memory was 1.2 GB in the beginning and 1.1 GB in the end (delta: 6.7 MB). Peak memory consumption was 6.7 MB. Max. memory is 11.5 GB. [2019-11-21 21:32:10,557 INFO L168 Benchmark]: RCFGBuilder took 524.29 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 26.2 MB). Peak memory consumption was 26.2 MB. Max. memory is 11.5 GB. [2019-11-21 21:32:10,557 INFO L168 Benchmark]: TraceAbstraction took 3353.06 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 958.8 MB in the end (delta: 164.1 MB). Peak memory consumption was 164.1 MB. Max. memory is 11.5 GB. [2019-11-21 21:32:10,558 INFO L168 Benchmark]: Witness Printer took 51.79 ms. Allocated memory is still 1.2 GB. Free memory is still 958.8 MB. There was no memory consumed. Max. memory is 11.5 GB. [2019-11-21 21:32:10,562 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.33 ms. Allocated memory is still 1.0 GB. Free memory is still 981.8 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 459.00 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 159.4 MB). Free memory was 951.0 MB in the beginning and 1.2 GB in the end (delta: -204.7 MB). Peak memory consumption was 20.6 MB. Max. memory is 11.5 GB. * Boogie Preprocessor took 69.41 ms. Allocated memory is still 1.2 GB. Free memory was 1.2 GB in the beginning and 1.1 GB in the end (delta: 6.7 MB). Peak memory consumption was 6.7 MB. Max. memory is 11.5 GB. * RCFGBuilder took 524.29 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 26.2 MB). Peak memory consumption was 26.2 MB. Max. memory is 11.5 GB. * TraceAbstraction took 3353.06 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 958.8 MB in the end (delta: 164.1 MB). Peak memory consumption was 164.1 MB. Max. memory is 11.5 GB. * Witness Printer took 51.79 ms. Allocated memory is still 1.2 GB. Free memory is still 958.8 MB. There was no memory consumed. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 20]: pointer dereference may fail pointer dereference may fail We found a FailurePath: [L37] int n = __VERIFIER_nondet_int(); [L40] EXPR, FCALL calloc(n, sizeof(int)) VAL [calloc(n, sizeof(int))={1:0}, n=1073741823] [L40] int *a = calloc(n, sizeof(int)); VAL [a={1:0}, calloc(n, sizeof(int))={1:0}, n=1073741823] [L41] CALL check(0, n-1, a, n) VAL [\old(n)=1073741823, \old(x)=0, \old(y)=1073741822, a={1:0}] [L12] COND FALSE !(x >= y) VAL [\old(n)=1073741823, \old(x)=0, \old(y)=1073741822, a={1:0}, a={1:0}, n=1073741823, x=0, y=1073741822] [L15] CALL __VERIFIER_assert(0 <= x && y < n) VAL [\old(cond)=1] [L6] COND FALSE !(!cond) VAL [\old(cond)=1, cond=1] [L15] RET __VERIFIER_assert(0 <= x && y < n) VAL [\old(n)=1073741823, \old(x)=0, \old(y)=1073741822, a={1:0}, a={1:0}, n=1073741823, x=0, y=1073741822] [L17] int x0 = x; [L18] int y0 = y; VAL [\old(n)=1073741823, \old(x)=0, \old(y)=1073741822, a={1:0}, a={1:0}, n=1073741823, x=0, x0=0, y=1073741822, y0=1073741822] [L20] a[x] - StatisticsResult: Ultimate Automizer benchmark data CFG has 6 procedures, 53 locations, 12 error locations. Result: UNSAFE, OverallTime: 3.2s, OverallIterations: 5, TraceHistogramMax: 1, AutomataDifference: 0.7s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, HoareTripleCheckerStatistics: 163 SDtfs, 156 SDslu, 317 SDs, 0 SdLazy, 193 SolverSat, 20 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.4s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 157 GetRequests, 127 SyntacticMatches, 10 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.3s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=53occurred in iteration=0, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 4 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.3s SatisfiabilityAnalysisTime, 0.5s InterpolantComputationTime, 99 NumberOfCodeBlocks, 99 NumberOfCodeBlocksAsserted, 5 NumberOfCheckSat, 148 ConstructedInterpolants, 14 QuantifiedInterpolants, 9415 SizeOfPredicates, 5 NumberOfNonLiveVariables, 249 ConjunctsInSsa, 15 ConjunctsInUnsatCore, 8 InterpolantComputations, 8 PerfectInterpolantSequences, 0/0 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...