/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=BIGGEST --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/nla-digbench/ps2.c


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


This is Ultimate 0.1.25-c90d42b
[2020-09-24 20:44:19,327 INFO  L177        SettingsManager]: Resetting all preferences to default values...
[2020-09-24 20:44:19,332 INFO  L181        SettingsManager]: Resetting UltimateCore preferences to default values
[2020-09-24 20:44:19,374 INFO  L184        SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring...
[2020-09-24 20:44:19,375 INFO  L181        SettingsManager]: Resetting Boogie Preprocessor preferences to default values
[2020-09-24 20:44:19,383 INFO  L181        SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values
[2020-09-24 20:44:19,386 INFO  L181        SettingsManager]: Resetting Abstract Interpretation preferences to default values
[2020-09-24 20:44:19,390 INFO  L181        SettingsManager]: Resetting LassoRanker preferences to default values
[2020-09-24 20:44:19,393 INFO  L181        SettingsManager]: Resetting Reaching Definitions preferences to default values
[2020-09-24 20:44:19,397 INFO  L181        SettingsManager]: Resetting SyntaxChecker preferences to default values
[2020-09-24 20:44:19,398 INFO  L181        SettingsManager]: Resetting Sifa preferences to default values
[2020-09-24 20:44:19,399 INFO  L184        SettingsManager]: Büchi Program Product provides no preferences, ignoring...
[2020-09-24 20:44:19,400 INFO  L181        SettingsManager]: Resetting LTL2Aut preferences to default values
[2020-09-24 20:44:19,403 INFO  L181        SettingsManager]: Resetting PEA to Boogie preferences to default values
[2020-09-24 20:44:19,406 INFO  L181        SettingsManager]: Resetting BlockEncodingV2 preferences to default values
[2020-09-24 20:44:19,408 INFO  L181        SettingsManager]: Resetting ChcToBoogie preferences to default values
[2020-09-24 20:44:19,410 INFO  L181        SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values
[2020-09-24 20:44:19,411 INFO  L181        SettingsManager]: Resetting BuchiAutomizer preferences to default values
[2020-09-24 20:44:19,413 INFO  L181        SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values
[2020-09-24 20:44:19,421 INFO  L181        SettingsManager]: Resetting CodeCheck preferences to default values
[2020-09-24 20:44:19,424 INFO  L181        SettingsManager]: Resetting InvariantSynthesis preferences to default values
[2020-09-24 20:44:19,425 INFO  L181        SettingsManager]: Resetting RCFGBuilder preferences to default values
[2020-09-24 20:44:19,426 INFO  L181        SettingsManager]: Resetting Referee preferences to default values
[2020-09-24 20:44:19,427 INFO  L181        SettingsManager]: Resetting TraceAbstraction preferences to default values
[2020-09-24 20:44:19,439 INFO  L184        SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring...
[2020-09-24 20:44:19,440 INFO  L184        SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring...
[2020-09-24 20:44:19,440 INFO  L181        SettingsManager]: Resetting TreeAutomizer preferences to default values
[2020-09-24 20:44:19,446 INFO  L181        SettingsManager]: Resetting IcfgToChc preferences to default values
[2020-09-24 20:44:19,447 INFO  L181        SettingsManager]: Resetting IcfgTransformer preferences to default values
[2020-09-24 20:44:19,448 INFO  L184        SettingsManager]: ReqToTest provides no preferences, ignoring...
[2020-09-24 20:44:19,448 INFO  L181        SettingsManager]: Resetting Boogie Printer preferences to default values
[2020-09-24 20:44:19,449 INFO  L181        SettingsManager]: Resetting ChcSmtPrinter preferences to default values
[2020-09-24 20:44:19,450 INFO  L181        SettingsManager]: Resetting ReqPrinter preferences to default values
[2020-09-24 20:44:19,451 INFO  L181        SettingsManager]: Resetting Witness Printer preferences to default values
[2020-09-24 20:44:19,452 INFO  L184        SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring...
[2020-09-24 20:44:19,452 INFO  L181        SettingsManager]: Resetting CDTParser preferences to default values
[2020-09-24 20:44:19,453 INFO  L184        SettingsManager]: AutomataScriptParser provides no preferences, ignoring...
[2020-09-24 20:44:19,453 INFO  L184        SettingsManager]: ReqParser provides no preferences, ignoring...
[2020-09-24 20:44:19,453 INFO  L181        SettingsManager]: Resetting SmtParser preferences to default values
[2020-09-24 20:44:19,454 INFO  L181        SettingsManager]: Resetting Witness Parser preferences to default values
[2020-09-24 20:44:19,455 INFO  L188        SettingsManager]: Finished resetting all preferences to default values...
[2020-09-24 20:44:19,456 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
[2020-09-24 20:44:19,483 INFO  L113        SettingsManager]: Loading preferences was successful
[2020-09-24 20:44:19,483 INFO  L115        SettingsManager]: Preferences different from defaults after loading the file:
[2020-09-24 20:44:19,485 INFO  L136        SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults:
[2020-09-24 20:44:19,485 INFO  L138        SettingsManager]:  * Create parallel compositions if possible=false
[2020-09-24 20:44:19,485 INFO  L138        SettingsManager]:  * Use SBE=true
[2020-09-24 20:44:19,485 INFO  L136        SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults:
[2020-09-24 20:44:19,486 INFO  L138        SettingsManager]:  * sizeof long=4
[2020-09-24 20:44:19,486 INFO  L138        SettingsManager]:  * Overapproximate operations on floating types=true
[2020-09-24 20:44:19,486 INFO  L138        SettingsManager]:  * sizeof POINTER=4
[2020-09-24 20:44:19,486 INFO  L138        SettingsManager]:  * Check division by zero=IGNORE
[2020-09-24 20:44:19,486 INFO  L138        SettingsManager]:  * Pointer to allocated memory at dereference=IGNORE
[2020-09-24 20:44:19,487 INFO  L138        SettingsManager]:  * If two pointers are subtracted or compared they have the same base address=IGNORE
[2020-09-24 20:44:19,487 INFO  L138        SettingsManager]:  * Check array bounds for arrays that are off heap=IGNORE
[2020-09-24 20:44:19,487 INFO  L138        SettingsManager]:  * sizeof long double=12
[2020-09-24 20:44:19,487 INFO  L138        SettingsManager]:  * Check if freed pointer was valid=false
[2020-09-24 20:44:19,487 INFO  L138        SettingsManager]:  * Use constant arrays=true
[2020-09-24 20:44:19,487 INFO  L138        SettingsManager]:  * Pointer base address is valid at dereference=IGNORE
[2020-09-24 20:44:19,488 INFO  L136        SettingsManager]: Preferences of RCFGBuilder differ from their defaults:
[2020-09-24 20:44:19,488 INFO  L138        SettingsManager]:  * Size of a code block=SequenceOfStatements
[2020-09-24 20:44:19,488 INFO  L138        SettingsManager]:  * To the following directory=./dump/
[2020-09-24 20:44:19,488 INFO  L138        SettingsManager]:  * SMT solver=External_DefaultMode
[2020-09-24 20:44:19,489 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2020-09-24 20:44:19,489 INFO  L136        SettingsManager]: Preferences of TraceAbstraction differ from their defaults:
[2020-09-24 20:44:19,489 INFO  L138        SettingsManager]:  * Compute Interpolants along a Counterexample=FPandBP
[2020-09-24 20:44:19,489 INFO  L138        SettingsManager]:  * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles
[2020-09-24 20:44:19,490 INFO  L138        SettingsManager]:  * Trace refinement strategy=CAMEL
[2020-09-24 20:44:19,490 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-09-24 20:44:19,490 INFO  L138        SettingsManager]:  * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true
[2020-09-24 20:44:19,490 INFO  L138        SettingsManager]:  * Trace refinement exception blacklist=NONE
[2020-09-24 20:44:19,490 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=BIGGEST;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=BIGGEST;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=BIGGEST;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=BIGGEST;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=BIGGEST;log-additional-information=true;
[2020-09-24 20:44:19,952 INFO  L75    nceAwareModelManager]: Repository-Root is: /tmp
[2020-09-24 20:44:19,969 INFO  L258   ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized
[2020-09-24 20:44:19,973 INFO  L214   ainManager$Toolchain]: [Toolchain 1]: Toolchain selected.
[2020-09-24 20:44:19,975 INFO  L271        PluginConnector]: Initializing CDTParser...
[2020-09-24 20:44:19,975 INFO  L275        PluginConnector]: CDTParser initialized
[2020-09-24 20:44:19,977 INFO  L429   ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench/ps2.c
[2020-09-24 20:44:20,064 INFO  L220              CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/e5fbe564d/3a5266267ba843bd97552378e7ea9a57/FLAG972e4a425
[2020-09-24 20:44:20,616 INFO  L306              CDTParser]: Found 1 translation units.
[2020-09-24 20:44:20,617 INFO  L160              CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/nla-digbench/ps2.c
[2020-09-24 20:44:20,626 INFO  L349              CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/e5fbe564d/3a5266267ba843bd97552378e7ea9a57/FLAG972e4a425
[2020-09-24 20:44:20,962 INFO  L357              CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/e5fbe564d/3a5266267ba843bd97552378e7ea9a57
[2020-09-24 20:44:20,977 INFO  L296   ainManager$Toolchain]: ####################### [Toolchain 1] #######################
[2020-09-24 20:44:20,983 INFO  L131        ToolchainWalker]: Walking toolchain with 4 elements.
[2020-09-24 20:44:20,986 INFO  L113        PluginConnector]: ------------------------CACSL2BoogieTranslator----------------------------
[2020-09-24 20:44:20,986 INFO  L271        PluginConnector]: Initializing CACSL2BoogieTranslator...
[2020-09-24 20:44:20,991 INFO  L275        PluginConnector]: CACSL2BoogieTranslator initialized
[2020-09-24 20:44:20,992 INFO  L185        PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.09 08:44:20" (1/1) ...
[2020-09-24 20:44:20,998 INFO  L205        PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@518dc62a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 08:44:20, skipping insertion in model container
[2020-09-24 20:44:20,998 INFO  L185        PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.09 08:44:20" (1/1) ...
[2020-09-24 20:44:21,008 INFO  L145         MainTranslator]: Starting translation in SV-COMP mode 
[2020-09-24 20:44:21,038 INFO  L178         MainTranslator]: Built tables and reachable declarations
[2020-09-24 20:44:21,251 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-09-24 20:44:21,256 INFO  L203         MainTranslator]: Completed pre-run
[2020-09-24 20:44:21,274 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-09-24 20:44:21,290 INFO  L208         MainTranslator]: Completed translation
[2020-09-24 20:44:21,290 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 08:44:21 WrapperNode
[2020-09-24 20:44:21,290 INFO  L132        PluginConnector]: ------------------------ END CACSL2BoogieTranslator----------------------------
[2020-09-24 20:44:21,291 INFO  L113        PluginConnector]: ------------------------Boogie Preprocessor----------------------------
[2020-09-24 20:44:21,292 INFO  L271        PluginConnector]: Initializing Boogie Preprocessor...
[2020-09-24 20:44:21,292 INFO  L275        PluginConnector]: Boogie Preprocessor initialized
[2020-09-24 20:44:21,306 INFO  L185        PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 08:44:21" (1/1) ...
[2020-09-24 20:44:21,307 INFO  L185        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 08:44:21" (1/1) ...
[2020-09-24 20:44:21,314 INFO  L185        PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 08:44:21" (1/1) ...
[2020-09-24 20:44:21,314 INFO  L185        PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 08:44:21" (1/1) ...
[2020-09-24 20:44:21,319 INFO  L185        PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 08:44:21" (1/1) ...
[2020-09-24 20:44:21,325 INFO  L185        PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 08:44:21" (1/1) ...
[2020-09-24 20:44:21,326 INFO  L185        PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 08:44:21" (1/1) ...
[2020-09-24 20:44:21,422 INFO  L132        PluginConnector]: ------------------------ END Boogie Preprocessor----------------------------
[2020-09-24 20:44:21,423 INFO  L113        PluginConnector]: ------------------------RCFGBuilder----------------------------
[2020-09-24 20:44:21,423 INFO  L271        PluginConnector]: Initializing RCFGBuilder...
[2020-09-24 20:44:21,423 INFO  L275        PluginConnector]: RCFGBuilder initialized
[2020-09-24 20:44:21,424 INFO  L185        PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 08:44:21" (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
[2020-09-24 20:44:21,505 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.init
[2020-09-24 20:44:21,506 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.start
[2020-09-24 20:44:21,506 INFO  L138     BoogieDeclarations]: Found implementation of procedure assume_abort_if_not
[2020-09-24 20:44:21,506 INFO  L138     BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert
[2020-09-24 20:44:21,507 INFO  L138     BoogieDeclarations]: Found implementation of procedure main
[2020-09-24 20:44:21,507 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_error
[2020-09-24 20:44:21,507 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int
[2020-09-24 20:44:21,508 INFO  L130     BoogieDeclarations]: Found specification of procedure abort
[2020-09-24 20:44:21,509 INFO  L130     BoogieDeclarations]: Found specification of procedure assume_abort_if_not
[2020-09-24 20:44:21,509 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_assert
[2020-09-24 20:44:21,509 INFO  L130     BoogieDeclarations]: Found specification of procedure main
[2020-09-24 20:44:21,510 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.init
[2020-09-24 20:44:21,510 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.start
[2020-09-24 20:44:21,742 INFO  L290             CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start)
[2020-09-24 20:44:21,742 INFO  L295             CfgBuilder]: Removed 1 assume(true) statements.
[2020-09-24 20:44:21,749 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.09 08:44:21 BoogieIcfgContainer
[2020-09-24 20:44:21,750 INFO  L132        PluginConnector]: ------------------------ END RCFGBuilder----------------------------
[2020-09-24 20:44:21,752 INFO  L113        PluginConnector]: ------------------------TraceAbstraction----------------------------
[2020-09-24 20:44:21,752 INFO  L271        PluginConnector]: Initializing TraceAbstraction...
[2020-09-24 20:44:21,756 INFO  L275        PluginConnector]: TraceAbstraction initialized
[2020-09-24 20:44:21,756 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.09 08:44:20" (1/3) ...
[2020-09-24 20:44:21,757 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@64e730cb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.09 08:44:21, skipping insertion in model container
[2020-09-24 20:44:21,758 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 08:44:21" (2/3) ...
[2020-09-24 20:44:21,758 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@64e730cb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.09 08:44:21, skipping insertion in model container
[2020-09-24 20:44:21,758 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.09 08:44:21" (3/3) ...
[2020-09-24 20:44:21,761 INFO  L109   eAbstractionObserver]: Analyzing ICFG ps2.c
[2020-09-24 20:44:21,777 INFO  L157   ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION
[2020-09-24 20:44:21,790 INFO  L169   ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations.
[2020-09-24 20:44:21,820 INFO  L251      AbstractCegarLoop]: Starting to check reachability of 1 error locations.
[2020-09-24 20:44:21,859 INFO  L375      AbstractCegarLoop]: Interprodecural is true
[2020-09-24 20:44:21,859 INFO  L376      AbstractCegarLoop]: Hoare is true
[2020-09-24 20:44:21,859 INFO  L377      AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation
[2020-09-24 20:44:21,859 INFO  L378      AbstractCegarLoop]: Backedges is STRAIGHT_LINE
[2020-09-24 20:44:21,860 INFO  L379      AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION
[2020-09-24 20:44:21,860 INFO  L380      AbstractCegarLoop]: Difference is false
[2020-09-24 20:44:21,860 INFO  L381      AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA
[2020-09-24 20:44:21,861 INFO  L385      AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce========
[2020-09-24 20:44:21,887 INFO  L276                IsEmpty]: Start isEmpty. Operand 32 states.
[2020-09-24 20:44:21,895 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 20
[2020-09-24 20:44:21,896 INFO  L414         BasicCegarLoop]: Found error trace
[2020-09-24 20:44:21,897 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-09-24 20:44:21,898 INFO  L427      AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-09-24 20:44:21,905 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-09-24 20:44:21,905 INFO  L82        PathProgramCache]: Analyzing trace with hash 41942830, now seen corresponding path program 1 times
[2020-09-24 20:44:21,915 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-09-24 20:44:21,916 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1960045050]
[2020-09-24 20:44:21,916 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-09-24 20:44:22,025 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-24 20:44:22,046 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-09-24 20:44:22,073 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1960045050]
[2020-09-24 20:44:22,074 WARN  L333   FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unsupported non-linear arithmetic
[2020-09-24 20:44:22,074 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 0 imperfect interpolant sequences.
[2020-09-24 20:44:22,075 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [] total 0
[2020-09-24 20:44:22,075 ERROR L206   FreeRefinementEngine]: Strategy FIXED_PREFERENCES failed to provide any proof altough trace is infeasible
[2020-09-24 20:44:22,076 INFO  L520         BasicCegarLoop]: Counterexample might be feasible
[2020-09-24 20:44:22,082 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0
[2020-09-24 20:44:22,100 WARN  L231   ceAbstractionStarter]: Unable to decide correctness. Please check the following counterexample manually.
[2020-09-24 20:44:22,101 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 24.09 08:44:22 BoogieIcfgContainer
[2020-09-24 20:44:22,101 INFO  L132        PluginConnector]: ------------------------ END TraceAbstraction----------------------------
[2020-09-24 20:44:22,105 INFO  L168              Benchmark]: Toolchain (without parser) took 1124.63 ms. Allocated memory was 147.8 MB in the beginning and 204.5 MB in the end (delta: 56.6 MB). Free memory was 102.8 MB in the beginning and 157.0 MB in the end (delta: -54.2 MB). Peak memory consumption was 2.5 MB. Max. memory is 7.1 GB.
[2020-09-24 20:44:22,106 INFO  L168              Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 147.8 MB. Free memory was 121.2 MB in the beginning and 121.0 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB.
[2020-09-24 20:44:22,107 INFO  L168              Benchmark]: CACSL2BoogieTranslator took 305.15 ms. Allocated memory is still 147.8 MB. Free memory was 102.4 MB in the beginning and 92.4 MB in the end (delta: 10.0 MB). Peak memory consumption was 10.0 MB. Max. memory is 7.1 GB.
[2020-09-24 20:44:22,108 INFO  L168              Benchmark]: Boogie Preprocessor took 131.06 ms. Allocated memory was 147.8 MB in the beginning and 204.5 MB in the end (delta: 56.6 MB). Free memory was 92.4 MB in the beginning and 184.4 MB in the end (delta: -92.1 MB). Peak memory consumption was 10.9 MB. Max. memory is 7.1 GB.
[2020-09-24 20:44:22,109 INFO  L168              Benchmark]: RCFGBuilder took 327.55 ms. Allocated memory is still 204.5 MB. Free memory was 184.4 MB in the beginning and 170.3 MB in the end (delta: 14.2 MB). Peak memory consumption was 14.2 MB. Max. memory is 7.1 GB.
[2020-09-24 20:44:22,110 INFO  L168              Benchmark]: TraceAbstraction took 349.11 ms. Allocated memory is still 204.5 MB. Free memory was 169.7 MB in the beginning and 157.0 MB in the end (delta: 12.7 MB). Peak memory consumption was 12.7 MB. Max. memory is 7.1 GB.
[2020-09-24 20:44:22,114 INFO  L336   ainManager$Toolchain]: #######################  End [Toolchain 1] #######################
 --- Results ---
 * Results from de.uni_freiburg.informatik.ultimate.core:
  - StatisticsResult: Toolchain Benchmarks
    Benchmark results are:
 * CDTParser took 0.21 ms. Allocated memory is still 147.8 MB. Free memory was 121.2 MB in the beginning and 121.0 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB.
 * CACSL2BoogieTranslator took 305.15 ms. Allocated memory is still 147.8 MB. Free memory was 102.4 MB in the beginning and 92.4 MB in the end (delta: 10.0 MB). Peak memory consumption was 10.0 MB. Max. memory is 7.1 GB.
 * Boogie Preprocessor took 131.06 ms. Allocated memory was 147.8 MB in the beginning and 204.5 MB in the end (delta: 56.6 MB). Free memory was 92.4 MB in the beginning and 184.4 MB in the end (delta: -92.1 MB). Peak memory consumption was 10.9 MB. Max. memory is 7.1 GB.
 * RCFGBuilder took 327.55 ms. Allocated memory is still 204.5 MB. Free memory was 184.4 MB in the beginning and 170.3 MB in the end (delta: 14.2 MB). Peak memory consumption was 14.2 MB. Max. memory is 7.1 GB.
 * TraceAbstraction took 349.11 ms. Allocated memory is still 204.5 MB. Free memory was 169.7 MB in the beginning and 157.0 MB in the end (delta: 12.7 MB). Peak memory consumption was 12.7 MB. Max. memory is 7.1 GB.
 * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction:
  - UnprovableResult [Line: 10]: Unable to prove that call of __VERIFIER_error() unreachable
    Unable to prove that call of __VERIFIER_error() unreachable
 Reason: unable to decide satisfiability of path constraint. 
Possible FailurePath: 
[L16]             int k, y, x, c;
[L17]             k = __VERIFIER_nondet_int()
[L19]             y = 0
[L20]             x = 0
[L21]             c = 0
[L33]  CALL       __VERIFIER_assert((y*y) - 2*x + y == 0)
[L8]   COND TRUE  !(cond)
[L10]             __VERIFIER_error()

  - StatisticsResult: Ultimate Automizer benchmark data
    CFG has 5 procedures, 37 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNKNOWN, OverallTime: 0.2s, OverallIterations: 1, TraceHistogramMax: 1, AutomataDifference: 0.0s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: No data available, PredicateUnifierStatistics: No data available, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=32occurred 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: No data available, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.0s InterpolantComputationTime, 19 NumberOfCodeBlocks, 19 NumberOfCodeBlocksAsserted, 1 NumberOfCheckSat, 0 ConstructedInterpolants, 0 QuantifiedInterpolants, 0 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 0 InterpolantComputations, 0 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 could not prove your program: unable to determine feasibility of some traces
Received shutdown request...