/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --rcfgbuilder.size.of.a.code.block SingleStatement --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options produce-proofs=true --traceabstraction.additional.smt.options produce-unsat-cores=true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=SMALLESTAMONGWIDE --traceabstraction.additional.smt.options tolerance=0.3 --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/ldv-regression/alias_of_return.c_1.i


--------------------------------------------------------------------------------


This is Ultimate 0.1.25-c90d42b
[2020-09-25 12:18:53,026 INFO  L177        SettingsManager]: Resetting all preferences to default values...
[2020-09-25 12:18:53,030 INFO  L181        SettingsManager]: Resetting UltimateCore preferences to default values
[2020-09-25 12:18:53,056 INFO  L184        SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring...
[2020-09-25 12:18:53,057 INFO  L181        SettingsManager]: Resetting Boogie Preprocessor preferences to default values
[2020-09-25 12:18:53,058 INFO  L181        SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values
[2020-09-25 12:18:53,059 INFO  L181        SettingsManager]: Resetting Abstract Interpretation preferences to default values
[2020-09-25 12:18:53,061 INFO  L181        SettingsManager]: Resetting LassoRanker preferences to default values
[2020-09-25 12:18:53,062 INFO  L181        SettingsManager]: Resetting Reaching Definitions preferences to default values
[2020-09-25 12:18:53,063 INFO  L181        SettingsManager]: Resetting SyntaxChecker preferences to default values
[2020-09-25 12:18:53,064 INFO  L181        SettingsManager]: Resetting Sifa preferences to default values
[2020-09-25 12:18:53,065 INFO  L184        SettingsManager]: Büchi Program Product provides no preferences, ignoring...
[2020-09-25 12:18:53,066 INFO  L181        SettingsManager]: Resetting LTL2Aut preferences to default values
[2020-09-25 12:18:53,067 INFO  L181        SettingsManager]: Resetting PEA to Boogie preferences to default values
[2020-09-25 12:18:53,068 INFO  L181        SettingsManager]: Resetting BlockEncodingV2 preferences to default values
[2020-09-25 12:18:53,069 INFO  L181        SettingsManager]: Resetting ChcToBoogie preferences to default values
[2020-09-25 12:18:53,070 INFO  L181        SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values
[2020-09-25 12:18:53,071 INFO  L181        SettingsManager]: Resetting BuchiAutomizer preferences to default values
[2020-09-25 12:18:53,073 INFO  L181        SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values
[2020-09-25 12:18:53,075 INFO  L181        SettingsManager]: Resetting CodeCheck preferences to default values
[2020-09-25 12:18:53,077 INFO  L181        SettingsManager]: Resetting InvariantSynthesis preferences to default values
[2020-09-25 12:18:53,078 INFO  L181        SettingsManager]: Resetting RCFGBuilder preferences to default values
[2020-09-25 12:18:53,079 INFO  L181        SettingsManager]: Resetting Referee preferences to default values
[2020-09-25 12:18:53,080 INFO  L181        SettingsManager]: Resetting TraceAbstraction preferences to default values
[2020-09-25 12:18:53,082 INFO  L184        SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring...
[2020-09-25 12:18:53,083 INFO  L184        SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring...
[2020-09-25 12:18:53,083 INFO  L181        SettingsManager]: Resetting TreeAutomizer preferences to default values
[2020-09-25 12:18:53,084 INFO  L181        SettingsManager]: Resetting IcfgToChc preferences to default values
[2020-09-25 12:18:53,085 INFO  L181        SettingsManager]: Resetting IcfgTransformer preferences to default values
[2020-09-25 12:18:53,086 INFO  L184        SettingsManager]: ReqToTest provides no preferences, ignoring...
[2020-09-25 12:18:53,086 INFO  L181        SettingsManager]: Resetting Boogie Printer preferences to default values
[2020-09-25 12:18:53,087 INFO  L181        SettingsManager]: Resetting ChcSmtPrinter preferences to default values
[2020-09-25 12:18:53,087 INFO  L181        SettingsManager]: Resetting ReqPrinter preferences to default values
[2020-09-25 12:18:53,088 INFO  L181        SettingsManager]: Resetting Witness Printer preferences to default values
[2020-09-25 12:18:53,089 INFO  L184        SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring...
[2020-09-25 12:18:53,090 INFO  L181        SettingsManager]: Resetting CDTParser preferences to default values
[2020-09-25 12:18:53,090 INFO  L184        SettingsManager]: AutomataScriptParser provides no preferences, ignoring...
[2020-09-25 12:18:53,091 INFO  L184        SettingsManager]: ReqParser provides no preferences, ignoring...
[2020-09-25 12:18:53,091 INFO  L181        SettingsManager]: Resetting SmtParser preferences to default values
[2020-09-25 12:18:53,092 INFO  L181        SettingsManager]: Resetting Witness Parser preferences to default values
[2020-09-25 12:18:53,093 INFO  L188        SettingsManager]: Finished resetting all preferences to default values...
[2020-09-25 12:18:53,093 INFO  L101        SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf
[2020-09-25 12:18:53,119 INFO  L113        SettingsManager]: Loading preferences was successful
[2020-09-25 12:18:53,120 INFO  L115        SettingsManager]: Preferences different from defaults after loading the file:
[2020-09-25 12:18:53,121 INFO  L136        SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults:
[2020-09-25 12:18:53,121 INFO  L138        SettingsManager]:  * Create parallel compositions if possible=false
[2020-09-25 12:18:53,121 INFO  L138        SettingsManager]:  * Use SBE=true
[2020-09-25 12:18:53,121 INFO  L136        SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults:
[2020-09-25 12:18:53,122 INFO  L138        SettingsManager]:  * sizeof long=4
[2020-09-25 12:18:53,122 INFO  L138        SettingsManager]:  * Overapproximate operations on floating types=true
[2020-09-25 12:18:53,122 INFO  L138        SettingsManager]:  * sizeof POINTER=4
[2020-09-25 12:18:53,122 INFO  L138        SettingsManager]:  * Check division by zero=IGNORE
[2020-09-25 12:18:53,122 INFO  L138        SettingsManager]:  * Pointer to allocated memory at dereference=IGNORE
[2020-09-25 12:18:53,123 INFO  L138        SettingsManager]:  * If two pointers are subtracted or compared they have the same base address=IGNORE
[2020-09-25 12:18:53,123 INFO  L138        SettingsManager]:  * Check array bounds for arrays that are off heap=IGNORE
[2020-09-25 12:18:53,123 INFO  L138        SettingsManager]:  * sizeof long double=12
[2020-09-25 12:18:53,123 INFO  L138        SettingsManager]:  * Check if freed pointer was valid=false
[2020-09-25 12:18:53,124 INFO  L138        SettingsManager]:  * Use constant arrays=true
[2020-09-25 12:18:53,124 INFO  L138        SettingsManager]:  * Pointer base address is valid at dereference=IGNORE
[2020-09-25 12:18:53,124 INFO  L136        SettingsManager]: Preferences of RCFGBuilder differ from their defaults:
[2020-09-25 12:18:53,124 INFO  L138        SettingsManager]:  * Size of a code block=SequenceOfStatements
[2020-09-25 12:18:53,124 INFO  L138        SettingsManager]:  * To the following directory=./dump/
[2020-09-25 12:18:53,125 INFO  L138        SettingsManager]:  * SMT solver=External_DefaultMode
[2020-09-25 12:18:53,125 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2020-09-25 12:18:53,125 INFO  L136        SettingsManager]: Preferences of TraceAbstraction differ from their defaults:
[2020-09-25 12:18:53,125 INFO  L138        SettingsManager]:  * Compute Interpolants along a Counterexample=FPandBP
[2020-09-25 12:18:53,125 INFO  L138        SettingsManager]:  * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles
[2020-09-25 12:18:53,126 INFO  L138        SettingsManager]:  * Trace refinement strategy=CAMEL
[2020-09-25 12:18:53,126 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-09-25 12:18:53,126 INFO  L138        SettingsManager]:  * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true
[2020-09-25 12:18:53,126 INFO  L138        SettingsManager]:  * Trace refinement exception blacklist=NONE
[2020-09-25 12:18:53,126 INFO  L138        SettingsManager]:  * SMT solver=External_ModelsAndUnsatCoreMode
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: Size of a code block -> SingleStatement
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.3;log-additional-information=true;
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.3;log-additional-information=true;
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.3;log-additional-information=true;
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.3;log-additional-information=true;
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.3;log-additional-information=true;
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.3;log-additional-information=true;
[2020-09-25 12:18:53,589 INFO  L75    nceAwareModelManager]: Repository-Root is: /tmp
[2020-09-25 12:18:53,606 INFO  L258   ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized
[2020-09-25 12:18:53,611 INFO  L214   ainManager$Toolchain]: [Toolchain 1]: Toolchain selected.
[2020-09-25 12:18:53,612 INFO  L271        PluginConnector]: Initializing CDTParser...
[2020-09-25 12:18:53,613 INFO  L275        PluginConnector]: CDTParser initialized
[2020-09-25 12:18:53,614 INFO  L429   ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-regression/alias_of_return.c_1.i
[2020-09-25 12:18:53,706 INFO  L220              CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/ad8cee371/6e9b884158fc4ac7bd22a57d337ce1fe/FLAG5a772d318
[2020-09-25 12:18:54,217 INFO  L306              CDTParser]: Found 1 translation units.
[2020-09-25 12:18:54,218 INFO  L160              CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/ldv-regression/alias_of_return.c_1.i
[2020-09-25 12:18:54,226 INFO  L349              CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/ad8cee371/6e9b884158fc4ac7bd22a57d337ce1fe/FLAG5a772d318
[2020-09-25 12:18:54,578 INFO  L357              CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/ad8cee371/6e9b884158fc4ac7bd22a57d337ce1fe
[2020-09-25 12:18:54,591 INFO  L296   ainManager$Toolchain]: ####################### [Toolchain 1] #######################
[2020-09-25 12:18:54,596 INFO  L131        ToolchainWalker]: Walking toolchain with 4 elements.
[2020-09-25 12:18:54,597 INFO  L113        PluginConnector]: ------------------------CACSL2BoogieTranslator----------------------------
[2020-09-25 12:18:54,597 INFO  L271        PluginConnector]: Initializing CACSL2BoogieTranslator...
[2020-09-25 12:18:54,601 INFO  L275        PluginConnector]: CACSL2BoogieTranslator initialized
[2020-09-25 12:18:54,603 INFO  L185        PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.09 12:18:54" (1/1) ...
[2020-09-25 12:18:54,607 INFO  L205        PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7e7cadc4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 12:18:54, skipping insertion in model container
[2020-09-25 12:18:54,607 INFO  L185        PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.09 12:18:54" (1/1) ...
[2020-09-25 12:18:54,616 INFO  L145         MainTranslator]: Starting translation in SV-COMP mode 
[2020-09-25 12:18:54,642 INFO  L178         MainTranslator]: Built tables and reachable declarations
[2020-09-25 12:18:54,832 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-09-25 12:18:54,848 INFO  L203         MainTranslator]: Completed pre-run
[2020-09-25 12:18:54,867 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-09-25 12:18:54,883 INFO  L208         MainTranslator]: Completed translation
[2020-09-25 12:18:54,883 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 12:18:54 WrapperNode
[2020-09-25 12:18:54,884 INFO  L132        PluginConnector]: ------------------------ END CACSL2BoogieTranslator----------------------------
[2020-09-25 12:18:54,884 INFO  L113        PluginConnector]: ------------------------Boogie Preprocessor----------------------------
[2020-09-25 12:18:54,884 INFO  L271        PluginConnector]: Initializing Boogie Preprocessor...
[2020-09-25 12:18:54,885 INFO  L275        PluginConnector]: Boogie Preprocessor initialized
[2020-09-25 12:18:54,898 INFO  L185        PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 12:18:54" (1/1) ...
[2020-09-25 12:18:54,898 INFO  L185        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 12:18:54" (1/1) ...
[2020-09-25 12:18:54,983 INFO  L185        PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 12:18:54" (1/1) ...
[2020-09-25 12:18:54,984 INFO  L185        PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 12:18:54" (1/1) ...
[2020-09-25 12:18:54,988 INFO  L185        PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 12:18:54" (1/1) ...
[2020-09-25 12:18:54,990 INFO  L185        PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 12:18:54" (1/1) ...
[2020-09-25 12:18:54,991 INFO  L185        PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 12:18:54" (1/1) ...
[2020-09-25 12:18:54,992 INFO  L132        PluginConnector]: ------------------------ END Boogie Preprocessor----------------------------
[2020-09-25 12:18:54,993 INFO  L113        PluginConnector]: ------------------------RCFGBuilder----------------------------
[2020-09-25 12:18:54,993 INFO  L271        PluginConnector]: Initializing RCFGBuilder...
[2020-09-25 12:18:54,993 INFO  L275        PluginConnector]: RCFGBuilder initialized
[2020-09-25 12:18:54,994 INFO  L185        PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 12:18:54" (1/1) ...
No working directory specified, using /storage/repos/ultimate-2/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
[2020-09-25 12:18:55,067 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.init
[2020-09-25 12:18:55,067 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.start
[2020-09-25 12:18:55,068 INFO  L138     BoogieDeclarations]: Found implementation of procedure err
[2020-09-25 12:18:55,068 INFO  L138     BoogieDeclarations]: Found implementation of procedure return_self
[2020-09-25 12:18:55,068 INFO  L138     BoogieDeclarations]: Found implementation of procedure main
[2020-09-25 12:18:55,068 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_error
[2020-09-25 12:18:55,068 INFO  L130     BoogieDeclarations]: Found specification of procedure err
[2020-09-25 12:18:55,070 INFO  L130     BoogieDeclarations]: Found specification of procedure return_self
[2020-09-25 12:18:55,070 INFO  L130     BoogieDeclarations]: Found specification of procedure main
[2020-09-25 12:18:55,070 INFO  L130     BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack
[2020-09-25 12:18:55,070 INFO  L130     BoogieDeclarations]: Found specification of procedure write~int
[2020-09-25 12:18:55,071 INFO  L130     BoogieDeclarations]: Found specification of procedure read~int
[2020-09-25 12:18:55,071 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc
[2020-09-25 12:18:55,071 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.init
[2020-09-25 12:18:55,071 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.start
[2020-09-25 12:18:55,301 INFO  L290             CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start)
[2020-09-25 12:18:55,301 INFO  L295             CfgBuilder]: Removed 0 assume(true) statements.
[2020-09-25 12:18:55,307 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.09 12:18:55 BoogieIcfgContainer
[2020-09-25 12:18:55,307 INFO  L132        PluginConnector]: ------------------------ END RCFGBuilder----------------------------
[2020-09-25 12:18:55,312 INFO  L113        PluginConnector]: ------------------------TraceAbstraction----------------------------
[2020-09-25 12:18:55,312 INFO  L271        PluginConnector]: Initializing TraceAbstraction...
[2020-09-25 12:18:55,317 INFO  L275        PluginConnector]: TraceAbstraction initialized
[2020-09-25 12:18:55,330 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.09 12:18:54" (1/3) ...
[2020-09-25 12:18:55,331 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@65c6164b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.09 12:18:55, skipping insertion in model container
[2020-09-25 12:18:55,331 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 12:18:54" (2/3) ...
[2020-09-25 12:18:55,332 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@65c6164b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.09 12:18:55, skipping insertion in model container
[2020-09-25 12:18:55,332 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.09 12:18:55" (3/3) ...
[2020-09-25 12:18:55,337 INFO  L109   eAbstractionObserver]: Analyzing ICFG alias_of_return.c_1.i
[2020-09-25 12:18:55,357 INFO  L157   ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION
[2020-09-25 12:18:55,368 INFO  L169   ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations.
[2020-09-25 12:18:55,402 INFO  L251      AbstractCegarLoop]: Starting to check reachability of 1 error locations.
[2020-09-25 12:18:55,429 INFO  L375      AbstractCegarLoop]: Interprodecural is true
[2020-09-25 12:18:55,429 INFO  L376      AbstractCegarLoop]: Hoare is true
[2020-09-25 12:18:55,429 INFO  L377      AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation
[2020-09-25 12:18:55,429 INFO  L378      AbstractCegarLoop]: Backedges is STRAIGHT_LINE
[2020-09-25 12:18:55,429 INFO  L379      AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION
[2020-09-25 12:18:55,429 INFO  L380      AbstractCegarLoop]: Difference is false
[2020-09-25 12:18:55,430 INFO  L381      AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA
[2020-09-25 12:18:55,430 INFO  L385      AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce========
[2020-09-25 12:18:55,451 INFO  L276                IsEmpty]: Start isEmpty. Operand 27 states.
[2020-09-25 12:18:55,459 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 18
[2020-09-25 12:18:55,459 INFO  L414         BasicCegarLoop]: Found error trace
[2020-09-25 12:18:55,460 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-09-25 12:18:55,460 INFO  L427      AbstractCegarLoop]: === Iteration 1 === [errErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-09-25 12:18:55,466 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-09-25 12:18:55,467 INFO  L82        PathProgramCache]: Analyzing trace with hash -1015683383, now seen corresponding path program 1 times
[2020-09-25 12:18:55,477 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-09-25 12:18:55,477 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1600842188]
[2020-09-25 12:18:55,477 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-09-25 12:18:55,607 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-25 12:18:55,637 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-09-25 12:18:55,847 FATAL L256   erpolLogProxyWrapper]: Timeout: 5000
[2020-09-25 12:18:55,847 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 26
[2020-09-25 12:18:55,847 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 1
[2020-09-25 12:18:55,848 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 234
[2020-09-25 12:18:55,853 FATAL L256   erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE
[2020-09-25 12:18:55,856 FATAL L256   erpolLogProxyWrapper]: Tolerance: 0.3
[2020-09-25 12:18:55,856 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 4
[2020-09-25 12:18:55,856 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 17
[2020-09-25 12:18:55,857 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 4
[2020-09-25 12:18:55,857 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 8
[2020-09-25 12:18:55,961 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-09-25 12:18:55,965 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-25 12:18:55,968 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-09-25 12:18:55,979 FATAL L256   erpolLogProxyWrapper]: Timeout: 5000
[2020-09-25 12:18:55,979 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 11
[2020-09-25 12:18:55,979 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 1
[2020-09-25 12:18:55,980 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 13
[2020-09-25 12:18:55,980 FATAL L256   erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE
[2020-09-25 12:18:55,980 FATAL L256   erpolLogProxyWrapper]: Tolerance: 0.3
[2020-09-25 12:18:55,981 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 1
[2020-09-25 12:18:55,981 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 2
[2020-09-25 12:18:55,981 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 1
[2020-09-25 12:18:55,981 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 1
[2020-09-25 12:18:55,991 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-09-25 12:18:55,992 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1600842188]
[2020-09-25 12:18:55,995 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-09-25 12:18:55,995 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6
[2020-09-25 12:18:55,999 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [155357176]
[2020-09-25 12:18:56,005 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 6 states
[2020-09-25 12:18:56,006 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-09-25 12:18:56,020 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants.
[2020-09-25 12:18:56,021 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30
[2020-09-25 12:18:56,023 INFO  L87              Difference]: Start difference. First operand 27 states. Second operand 6 states.
[2020-09-25 12:18:56,146 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-09-25 12:18:56,147 INFO  L93              Difference]: Finished difference Result 33 states and 32 transitions.
[2020-09-25 12:18:56,148 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. 
[2020-09-25 12:18:56,149 INFO  L78                 Accepts]: Start accepts. Automaton has 6 states. Word has length 17
[2020-09-25 12:18:56,150 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-09-25 12:18:56,158 INFO  L225             Difference]: With dead ends: 33
[2020-09-25 12:18:56,159 INFO  L226             Difference]: Without dead ends: 0
[2020-09-25 12:18:56,163 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56
[2020-09-25 12:18:56,184 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 0 states.
[2020-09-25 12:18:56,190 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0.
[2020-09-25 12:18:56,192 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 0 states.
[2020-09-25 12:18:56,192 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions.
[2020-09-25 12:18:56,194 INFO  L78                 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 17
[2020-09-25 12:18:56,194 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-09-25 12:18:56,194 INFO  L479      AbstractCegarLoop]: Abstraction has 0 states and 0 transitions.
[2020-09-25 12:18:56,194 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 6 states.
[2020-09-25 12:18:56,194 INFO  L276                IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions.
[2020-09-25 12:18:56,194 INFO  L282                IsEmpty]: Finished isEmpty. No accepting run.
[2020-09-25 12:18:56,195 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0
[2020-09-25 12:18:56,197 INFO  L343    DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions.
[2020-09-25 12:18:56,284 INFO  L268        CegarLoopResult]: For program point  return_selfENTRY(lines 19 22)  no Hoare annotation was computed.
[2020-09-25 12:18:56,284 INFO  L268        CegarLoopResult]: For program point  return_selfFINAL(lines 19 22)  no Hoare annotation was computed.
[2020-09-25 12:18:56,284 INFO  L268        CegarLoopResult]: For program point  L21(line 21)  no Hoare annotation was computed.
[2020-09-25 12:18:56,284 INFO  L268        CegarLoopResult]: For program point  return_selfEXIT(lines 19 22)  no Hoare annotation was computed.
[2020-09-25 12:18:56,284 INFO  L268        CegarLoopResult]: For program point  L-1(line -1)  no Hoare annotation was computed.
[2020-09-25 12:18:56,286 INFO  L268        CegarLoopResult]: For program point  L-1-1(line -1)  no Hoare annotation was computed.
[2020-09-25 12:18:56,286 INFO  L268        CegarLoopResult]: For program point  ULTIMATE.initFINAL(line -1)  no Hoare annotation was computed.
[2020-09-25 12:18:56,286 INFO  L264        CegarLoopResult]: At program point  ULTIMATE.initENTRY(line -1)  the Hoare annotation is:  (and (= |#NULL.base| |old(#NULL.base)|) (= |#NULL.offset| |old(#NULL.offset)|) (= |old(#valid)| |#valid|))
[2020-09-25 12:18:56,287 INFO  L268        CegarLoopResult]: For program point  ULTIMATE.initEXIT(line -1)  no Hoare annotation was computed.
[2020-09-25 12:18:56,287 INFO  L268        CegarLoopResult]: For program point  errErr0ASSERT_VIOLATIONERROR_FUNCTION(line 16)  no Hoare annotation was computed.
[2020-09-25 12:18:56,287 INFO  L268        CegarLoopResult]: For program point  errEXIT(lines 15 16)  no Hoare annotation was computed.
[2020-09-25 12:18:56,287 INFO  L271        CegarLoopResult]: At program point  errENTRY(lines 15 16)  the Hoare annotation is:  true
[2020-09-25 12:18:56,288 INFO  L268        CegarLoopResult]: For program point  errFINAL(lines 15 16)  no Hoare annotation was computed.
[2020-09-25 12:18:56,289 INFO  L268        CegarLoopResult]: For program point  ULTIMATE.startEXIT(line -1)  no Hoare annotation was computed.
[2020-09-25 12:18:56,289 INFO  L271        CegarLoopResult]: At program point  L-1(line -1)  the Hoare annotation is:  true
[2020-09-25 12:18:56,289 INFO  L271        CegarLoopResult]: At program point  ULTIMATE.startENTRY(line -1)  the Hoare annotation is:  true
[2020-09-25 12:18:56,290 INFO  L268        CegarLoopResult]: For program point  ULTIMATE.startFINAL(line -1)  no Hoare annotation was computed.
[2020-09-25 12:18:56,290 INFO  L268        CegarLoopResult]: For program point  L37-4(line 37)  no Hoare annotation was computed.
[2020-09-25 12:18:56,290 INFO  L268        CegarLoopResult]: For program point  L37-5(line 37)  no Hoare annotation was computed.
[2020-09-25 12:18:56,291 INFO  L264        CegarLoopResult]: At program point  mainENTRY(lines 24 38)  the Hoare annotation is:  (= |old(#valid)| |#valid|)
[2020-09-25 12:18:56,291 INFO  L268        CegarLoopResult]: For program point  L28(line 28)  no Hoare annotation was computed.
[2020-09-25 12:18:56,291 INFO  L268        CegarLoopResult]: For program point  L28-1(line 28)  no Hoare annotation was computed.
[2020-09-25 12:18:56,291 INFO  L268        CegarLoopResult]: For program point  L26(line 26)  no Hoare annotation was computed.
[2020-09-25 12:18:56,291 INFO  L268        CegarLoopResult]: For program point  L26-1(line 26)  no Hoare annotation was computed.
[2020-09-25 12:18:56,292 INFO  L268        CegarLoopResult]: For program point  mainEXIT(lines 24 38)  no Hoare annotation was computed.
[2020-09-25 12:18:56,292 INFO  L268        CegarLoopResult]: For program point  mainFINAL(lines 24 38)  no Hoare annotation was computed.
[2020-09-25 12:18:56,292 INFO  L268        CegarLoopResult]: For program point  L37(line 37)  no Hoare annotation was computed.
[2020-09-25 12:18:56,292 INFO  L268        CegarLoopResult]: For program point  L37-1(line 37)  no Hoare annotation was computed.
[2020-09-25 12:18:56,292 INFO  L268        CegarLoopResult]: For program point  L35(line 35)  no Hoare annotation was computed.
[2020-09-25 12:18:56,293 INFO  L264        CegarLoopResult]: At program point  L37-2(line 37)  the Hoare annotation is:  false
[2020-09-25 12:18:56,293 INFO  L268        CegarLoopResult]: For program point  L35-1(line 35)  no Hoare annotation was computed.
[2020-09-25 12:18:56,300 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 25.09 12:18:56 BoogieIcfgContainer
[2020-09-25 12:18:56,301 INFO  L132        PluginConnector]: ------------------------ END TraceAbstraction----------------------------
[2020-09-25 12:18:56,304 INFO  L168              Benchmark]: Toolchain (without parser) took 1709.94 ms. Allocated memory was 138.4 MB in the beginning and 200.8 MB in the end (delta: 62.4 MB). Free memory was 101.7 MB in the beginning and 118.0 MB in the end (delta: -16.4 MB). Peak memory consumption was 46.0 MB. Max. memory is 7.1 GB.
[2020-09-25 12:18:56,305 INFO  L168              Benchmark]: CDTParser took 0.24 ms. Allocated memory is still 138.4 MB. Free memory was 119.9 MB in the beginning and 119.7 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB.
[2020-09-25 12:18:56,306 INFO  L168              Benchmark]: CACSL2BoogieTranslator took 287.00 ms. Allocated memory is still 138.4 MB. Free memory was 101.0 MB in the beginning and 91.7 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB.
[2020-09-25 12:18:56,307 INFO  L168              Benchmark]: Boogie Preprocessor took 108.01 ms. Allocated memory was 138.4 MB in the beginning and 200.8 MB in the end (delta: 62.4 MB). Free memory was 91.7 MB in the beginning and 179.3 MB in the end (delta: -87.5 MB). Peak memory consumption was 13.0 MB. Max. memory is 7.1 GB.
[2020-09-25 12:18:56,308 INFO  L168              Benchmark]: RCFGBuilder took 314.84 ms. Allocated memory is still 200.8 MB. Free memory was 179.3 MB in the beginning and 165.2 MB in the end (delta: 14.1 MB). Peak memory consumption was 14.1 MB. Max. memory is 7.1 GB.
[2020-09-25 12:18:56,309 INFO  L168              Benchmark]: TraceAbstraction took 988.90 ms. Allocated memory is still 200.8 MB. Free memory was 165.2 MB in the beginning and 118.0 MB in the end (delta: 47.2 MB). Peak memory consumption was 47.2 MB. Max. memory is 7.1 GB.
[2020-09-25 12:18:56,313 INFO  L336   ainManager$Toolchain]: #######################  End [Toolchain 1] #######################
 --- Results ---
 * Results from de.uni_freiburg.informatik.ultimate.core:
  - StatisticsResult: Toolchain Benchmarks
    Benchmark results are:
 * CDTParser took 0.24 ms. Allocated memory is still 138.4 MB. Free memory was 119.9 MB in the beginning and 119.7 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB.
 * CACSL2BoogieTranslator took 287.00 ms. Allocated memory is still 138.4 MB. Free memory was 101.0 MB in the beginning and 91.7 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB.
 * Boogie Preprocessor took 108.01 ms. Allocated memory was 138.4 MB in the beginning and 200.8 MB in the end (delta: 62.4 MB). Free memory was 91.7 MB in the beginning and 179.3 MB in the end (delta: -87.5 MB). Peak memory consumption was 13.0 MB. Max. memory is 7.1 GB.
 * RCFGBuilder took 314.84 ms. Allocated memory is still 200.8 MB. Free memory was 179.3 MB in the beginning and 165.2 MB in the end (delta: 14.1 MB). Peak memory consumption was 14.1 MB. Max. memory is 7.1 GB.
 * TraceAbstraction took 988.90 ms. Allocated memory is still 200.8 MB. Free memory was 165.2 MB in the beginning and 118.0 MB in the end (delta: 47.2 MB). Peak memory consumption was 47.2 MB. Max. memory is 7.1 GB.
 * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction:
  - PositiveResult [Line: 16]: call of __VERIFIER_error() unreachable
    For all program executions holds that call of __VERIFIER_error() unreachable at this location
  - AllSpecificationsHoldResult: All specifications hold
    1 specifications checked. All of them hold
  - StatisticsResult: Ultimate Automizer benchmark data
    CFG has 5 procedures, 31 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 0.7s, OverallIterations: 1, TraceHistogramMax: 1, AutomataDifference: 0.1s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 15 SDtfs, 10 SDslu, 40 SDs, 0 SdLazy, 30 SolverSat, 1 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=27occurred 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, 1 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 6 LocationsWithAnnotation, 6 PreInvPairs, 6 NumberOfFragments, 17 HoareAnnotationTreeSize, 6 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 6 FomulaSimplificationsInter, 7 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.3s InterpolantComputationTime, 17 NumberOfCodeBlocks, 17 NumberOfCodeBlocksAsserted, 1 NumberOfCheckSat, 16 ConstructedInterpolants, 0 QuantifiedInterpolants, 624 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 1 InterpolantComputations, 1 PerfectInterpolantSequences, 0/0 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available
RESULT: Ultimate proved your program to be correct!
Received shutdown request...