./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/recursive-simple/id2_b3_o2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 54858612 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerReach.xml -i ../sv-benchmarks/c/recursive-simple/id2_b3_o2.c -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 22bfff7e0bc9ff374f4201c2281f2aec36cb181e .................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE --- Real Ultimate output --- This is Ultimate 0.2.0-5485861 [2020-10-25 23:11:37,009 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-25 23:11:37,012 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-25 23:11:37,049 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-10-25 23:11:37,049 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-10-25 23:11:37,051 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-10-25 23:11:37,053 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-10-25 23:11:37,055 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-10-25 23:11:37,058 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-10-25 23:11:37,059 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-10-25 23:11:37,060 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-10-25 23:11:37,062 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-10-25 23:11:37,062 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-25 23:11:37,064 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-25 23:11:37,065 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-25 23:11:37,066 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-25 23:11:37,067 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-25 23:11:37,068 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-25 23:11:37,071 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-25 23:11:37,073 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-25 23:11:37,075 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-25 23:11:37,077 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-25 23:11:37,078 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-25 23:11:37,079 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-25 23:11:37,083 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-10-25 23:11:37,083 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-10-25 23:11:37,084 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-10-25 23:11:37,085 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-10-25 23:11:37,085 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-10-25 23:11:37,087 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-10-25 23:11:37,087 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-10-25 23:11:37,088 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-10-25 23:11:37,089 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-10-25 23:11:37,090 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-10-25 23:11:37,092 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-10-25 23:11:37,092 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-10-25 23:11:37,093 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-10-25 23:11:37,094 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-10-25 23:11:37,094 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-10-25 23:11:37,096 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-10-25 23:11:37,097 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-10-25 23:11:37,098 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2020-10-25 23:11:37,128 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-25 23:11:37,128 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-25 23:11:37,130 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-10-25 23:11:37,130 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-10-25 23:11:37,130 INFO L138 SettingsManager]: * Use SBE=true [2020-10-25 23:11:37,131 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-25 23:11:37,131 INFO L138 SettingsManager]: * sizeof long=4 [2020-10-25 23:11:37,131 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-25 23:11:37,132 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-10-25 23:11:37,132 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-25 23:11:37,132 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-10-25 23:11:37,133 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-10-25 23:11:37,133 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-10-25 23:11:37,133 INFO L138 SettingsManager]: * sizeof long double=12 [2020-10-25 23:11:37,134 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-25 23:11:37,134 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-25 23:11:37,134 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-10-25 23:11:37,134 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-25 23:11:37,135 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-10-25 23:11:37,135 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-10-25 23:11:37,135 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-10-25 23:11:37,136 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-25 23:11:37,136 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-25 23:11:37,136 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-10-25 23:11:37,136 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-10-25 23:11:37,137 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-10-25 23:11:37,137 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-10-25 23:11:37,137 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-10-25 23:11:37,137 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-10-25 23:11:37,138 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 22bfff7e0bc9ff374f4201c2281f2aec36cb181e [2020-10-25 23:11:37,617 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-25 23:11:37,679 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-25 23:11:37,683 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-25 23:11:37,685 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-25 23:11:37,688 INFO L275 PluginConnector]: CDTParser initialized [2020-10-25 23:11:37,690 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/recursive-simple/id2_b3_o2.c [2020-10-25 23:11:37,787 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9c7f9be6e/134ed648f6f34b80aa5aee4b80cbe0e4/FLAG1f6d71731 [2020-10-25 23:11:38,421 INFO L306 CDTParser]: Found 1 translation units. [2020-10-25 23:11:38,422 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursive-simple/id2_b3_o2.c [2020-10-25 23:11:38,430 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9c7f9be6e/134ed648f6f34b80aa5aee4b80cbe0e4/FLAG1f6d71731 [2020-10-25 23:11:38,785 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9c7f9be6e/134ed648f6f34b80aa5aee4b80cbe0e4 [2020-10-25 23:11:38,789 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-25 23:11:38,801 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-10-25 23:11:38,804 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-25 23:11:38,805 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-25 23:11:38,812 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-25 23:11:38,813 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.10 11:11:38" (1/1) ... [2020-10-25 23:11:38,818 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3fe229d8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.10 11:11:38, skipping insertion in model container [2020-10-25 23:11:38,818 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.10 11:11:38" (1/1) ... [2020-10-25 23:11:38,826 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-25 23:11:38,845 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-25 23:11:39,051 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-25 23:11:39,063 INFO L203 MainTranslator]: Completed pre-run [2020-10-25 23:11:39,083 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-25 23:11:39,100 INFO L208 MainTranslator]: Completed translation [2020-10-25 23:11:39,100 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.10 11:11:39 WrapperNode [2020-10-25 23:11:39,100 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-25 23:11:39,102 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-10-25 23:11:39,102 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-10-25 23:11:39,102 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-10-25 23:11:39,111 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.10 11:11:39" (1/1) ... [2020-10-25 23:11:39,119 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.10 11:11:39" (1/1) ... [2020-10-25 23:11:39,138 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-10-25 23:11:39,140 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-25 23:11:39,140 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-25 23:11:39,141 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-25 23:11:39,150 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.10 11:11:39" (1/1) ... [2020-10-25 23:11:39,151 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.10 11:11:39" (1/1) ... [2020-10-25 23:11:39,163 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.10 11:11:39" (1/1) ... [2020-10-25 23:11:39,164 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.10 11:11:39" (1/1) ... [2020-10-25 23:11:39,168 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.10 11:11:39" (1/1) ... [2020-10-25 23:11:39,171 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.10 11:11:39" (1/1) ... [2020-10-25 23:11:39,172 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.10 11:11:39" (1/1) ... [2020-10-25 23:11:39,175 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-25 23:11:39,183 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-25 23:11:39,183 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-25 23:11:39,183 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-25 23:11:39,184 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.10 11:11:39" (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 [2020-10-25 23:11:39,261 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-10-25 23:11:39,261 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-10-25 23:11:39,261 INFO L130 BoogieDeclarations]: Found specification of procedure id2 [2020-10-25 23:11:39,261 INFO L138 BoogieDeclarations]: Found implementation of procedure id2 [2020-10-25 23:11:39,261 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-25 23:11:39,261 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-25 23:11:39,262 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-10-25 23:11:39,262 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-10-25 23:11:39,531 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-25 23:11:39,531 INFO L298 CfgBuilder]: Removed 6 assume(true) statements. [2020-10-25 23:11:39,534 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.10 11:11:39 BoogieIcfgContainer [2020-10-25 23:11:39,534 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-25 23:11:39,537 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-10-25 23:11:39,538 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-10-25 23:11:39,542 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-10-25 23:11:39,543 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.10 11:11:38" (1/3) ... [2020-10-25 23:11:39,544 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3d00835a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.10 11:11:39, skipping insertion in model container [2020-10-25 23:11:39,544 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.10 11:11:39" (2/3) ... [2020-10-25 23:11:39,545 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3d00835a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.10 11:11:39, skipping insertion in model container [2020-10-25 23:11:39,545 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.10 11:11:39" (3/3) ... [2020-10-25 23:11:39,547 INFO L111 eAbstractionObserver]: Analyzing ICFG id2_b3_o2.c [2020-10-25 23:11:39,563 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-10-25 23:11:39,569 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-10-25 23:11:39,585 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-10-25 23:11:39,617 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-10-25 23:11:39,618 INFO L378 AbstractCegarLoop]: Hoare is true [2020-10-25 23:11:39,618 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-10-25 23:11:39,618 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-25 23:11:39,618 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-25 23:11:39,619 INFO L382 AbstractCegarLoop]: Difference is false [2020-10-25 23:11:39,619 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-25 23:11:39,619 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-10-25 23:11:39,639 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states. [2020-10-25 23:11:39,646 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-10-25 23:11:39,647 INFO L414 BasicCegarLoop]: Found error trace [2020-10-25 23:11:39,648 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-25 23:11:39,648 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-25 23:11:39,656 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-25 23:11:39,657 INFO L82 PathProgramCache]: Analyzing trace with hash 1818828162, now seen corresponding path program 1 times [2020-10-25 23:11:39,666 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-25 23:11:39,667 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1372666814] [2020-10-25 23:11:39,667 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-25 23:11:39,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:11:40,005 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:11:40,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:11:40,051 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-25 23:11:40,052 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1372666814] [2020-10-25 23:11:40,053 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-25 23:11:40,053 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-10-25 23:11:40,055 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [135615507] [2020-10-25 23:11:40,061 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-10-25 23:11:40,062 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-25 23:11:40,080 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-10-25 23:11:40,081 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-10-25 23:11:40,084 INFO L87 Difference]: Start difference. First operand 25 states. Second operand 5 states. [2020-10-25 23:11:40,144 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-25 23:11:40,144 INFO L93 Difference]: Finished difference Result 37 states and 42 transitions. [2020-10-25 23:11:40,145 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-10-25 23:11:40,147 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 10 [2020-10-25 23:11:40,148 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-25 23:11:40,158 INFO L225 Difference]: With dead ends: 37 [2020-10-25 23:11:40,158 INFO L226 Difference]: Without dead ends: 23 [2020-10-25 23:11:40,162 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-10-25 23:11:40,183 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-10-25 23:11:40,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-10-25 23:11:40,210 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-10-25 23:11:40,212 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 27 transitions. [2020-10-25 23:11:40,214 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 27 transitions. Word has length 10 [2020-10-25 23:11:40,215 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-25 23:11:40,215 INFO L481 AbstractCegarLoop]: Abstraction has 23 states and 27 transitions. [2020-10-25 23:11:40,215 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-10-25 23:11:40,216 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 27 transitions. [2020-10-25 23:11:40,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-10-25 23:11:40,218 INFO L414 BasicCegarLoop]: Found error trace [2020-10-25 23:11:40,218 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-25 23:11:40,219 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-10-25 23:11:40,219 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-25 23:11:40,220 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-25 23:11:40,221 INFO L82 PathProgramCache]: Analyzing trace with hash -554629661, now seen corresponding path program 1 times [2020-10-25 23:11:40,221 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-25 23:11:40,221 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1492371104] [2020-10-25 23:11:40,222 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-25 23:11:40,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:11:40,279 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:11:40,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:11:40,398 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:11:40,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:11:40,461 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-25 23:11:40,462 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1492371104] [2020-10-25 23:11:40,465 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-25 23:11:40,466 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-10-25 23:11:40,466 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1300628446] [2020-10-25 23:11:40,468 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-10-25 23:11:40,470 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-25 23:11:40,471 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-10-25 23:11:40,472 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-10-25 23:11:40,475 INFO L87 Difference]: Start difference. First operand 23 states and 27 transitions. Second operand 5 states. [2020-10-25 23:11:40,510 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-25 23:11:40,511 INFO L93 Difference]: Finished difference Result 41 states and 49 transitions. [2020-10-25 23:11:40,513 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-10-25 23:11:40,513 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2020-10-25 23:11:40,513 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-25 23:11:40,514 INFO L225 Difference]: With dead ends: 41 [2020-10-25 23:11:40,514 INFO L226 Difference]: Without dead ends: 29 [2020-10-25 23:11:40,517 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-10-25 23:11:40,518 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-10-25 23:11:40,535 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 27. [2020-10-25 23:11:40,536 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-10-25 23:11:40,539 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 31 transitions. [2020-10-25 23:11:40,541 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 31 transitions. Word has length 17 [2020-10-25 23:11:40,542 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-25 23:11:40,542 INFO L481 AbstractCegarLoop]: Abstraction has 27 states and 31 transitions. [2020-10-25 23:11:40,543 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-10-25 23:11:40,544 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 31 transitions. [2020-10-25 23:11:40,546 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-10-25 23:11:40,546 INFO L414 BasicCegarLoop]: Found error trace [2020-10-25 23:11:40,546 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-25 23:11:40,547 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-10-25 23:11:40,547 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-25 23:11:40,548 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-25 23:11:40,548 INFO L82 PathProgramCache]: Analyzing trace with hash -526000510, now seen corresponding path program 1 times [2020-10-25 23:11:40,549 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-25 23:11:40,550 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [80858371] [2020-10-25 23:11:40,551 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-25 23:11:40,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:11:40,689 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:11:40,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:11:40,744 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:11:40,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:11:40,772 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-25 23:11:40,773 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [80858371] [2020-10-25 23:11:40,773 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-25 23:11:40,773 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-10-25 23:11:40,773 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1023963132] [2020-10-25 23:11:40,774 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-10-25 23:11:40,774 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-25 23:11:40,775 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-10-25 23:11:40,775 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2020-10-25 23:11:40,776 INFO L87 Difference]: Start difference. First operand 27 states and 31 transitions. Second operand 8 states. [2020-10-25 23:11:40,838 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-25 23:11:40,838 INFO L93 Difference]: Finished difference Result 33 states and 37 transitions. [2020-10-25 23:11:40,839 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-10-25 23:11:40,839 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 17 [2020-10-25 23:11:40,839 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-25 23:11:40,840 INFO L225 Difference]: With dead ends: 33 [2020-10-25 23:11:40,840 INFO L226 Difference]: Without dead ends: 29 [2020-10-25 23:11:40,841 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2020-10-25 23:11:40,842 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-10-25 23:11:40,847 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 27. [2020-10-25 23:11:40,848 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-10-25 23:11:40,849 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 31 transitions. [2020-10-25 23:11:40,849 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 31 transitions. Word has length 17 [2020-10-25 23:11:40,850 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-25 23:11:40,850 INFO L481 AbstractCegarLoop]: Abstraction has 27 states and 31 transitions. [2020-10-25 23:11:40,850 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-10-25 23:11:40,850 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 31 transitions. [2020-10-25 23:11:40,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-10-25 23:11:40,851 INFO L414 BasicCegarLoop]: Found error trace [2020-10-25 23:11:40,852 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-25 23:11:40,852 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-10-25 23:11:40,852 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-25 23:11:40,853 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-25 23:11:40,853 INFO L82 PathProgramCache]: Analyzing trace with hash 1446075610, now seen corresponding path program 1 times [2020-10-25 23:11:40,853 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-25 23:11:40,854 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1898581096] [2020-10-25 23:11:40,854 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-25 23:11:40,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:11:40,900 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:11:40,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:11:40,923 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:11:40,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:11:40,979 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:11:40,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:11:41,000 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-10-25 23:11:41,001 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1898581096] [2020-10-25 23:11:41,001 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-25 23:11:41,001 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-10-25 23:11:41,001 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1906038013] [2020-10-25 23:11:41,002 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-10-25 23:11:41,002 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-25 23:11:41,003 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-10-25 23:11:41,003 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-10-25 23:11:41,003 INFO L87 Difference]: Start difference. First operand 27 states and 31 transitions. Second operand 5 states. [2020-10-25 23:11:41,026 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-25 23:11:41,026 INFO L93 Difference]: Finished difference Result 45 states and 52 transitions. [2020-10-25 23:11:41,027 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-10-25 23:11:41,027 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 24 [2020-10-25 23:11:41,027 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-25 23:11:41,028 INFO L225 Difference]: With dead ends: 45 [2020-10-25 23:11:41,029 INFO L226 Difference]: Without dead ends: 33 [2020-10-25 23:11:41,029 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-10-25 23:11:41,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-10-25 23:11:41,035 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 31. [2020-10-25 23:11:41,035 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-10-25 23:11:41,036 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2020-10-25 23:11:41,036 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 24 [2020-10-25 23:11:41,037 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-25 23:11:41,037 INFO L481 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2020-10-25 23:11:41,037 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-10-25 23:11:41,037 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2020-10-25 23:11:41,038 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-10-25 23:11:41,038 INFO L414 BasicCegarLoop]: Found error trace [2020-10-25 23:11:41,038 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-25 23:11:41,039 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-10-25 23:11:41,039 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-25 23:11:41,039 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-25 23:11:41,040 INFO L82 PathProgramCache]: Analyzing trace with hash 1249562105, now seen corresponding path program 1 times [2020-10-25 23:11:41,040 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-25 23:11:41,040 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1918771030] [2020-10-25 23:11:41,040 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-25 23:11:41,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:11:41,071 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:11:41,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:11:41,127 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:11:41,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:11:41,193 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:11:41,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:11:41,221 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-10-25 23:11:41,222 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1918771030] [2020-10-25 23:11:41,222 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-25 23:11:41,222 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-10-25 23:11:41,223 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1646388503] [2020-10-25 23:11:41,223 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-10-25 23:11:41,224 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-25 23:11:41,224 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-10-25 23:11:41,225 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2020-10-25 23:11:41,225 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand 8 states. [2020-10-25 23:11:41,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-25 23:11:41,287 INFO L93 Difference]: Finished difference Result 49 states and 57 transitions. [2020-10-25 23:11:41,288 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-10-25 23:11:41,288 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 24 [2020-10-25 23:11:41,288 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-25 23:11:41,289 INFO L225 Difference]: With dead ends: 49 [2020-10-25 23:11:41,289 INFO L226 Difference]: Without dead ends: 37 [2020-10-25 23:11:41,290 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2020-10-25 23:11:41,291 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-10-25 23:11:41,296 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2020-10-25 23:11:41,296 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-10-25 23:11:41,297 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2020-10-25 23:11:41,298 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 24 [2020-10-25 23:11:41,298 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-25 23:11:41,298 INFO L481 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2020-10-25 23:11:41,298 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-10-25 23:11:41,298 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2020-10-25 23:11:41,299 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-10-25 23:11:41,299 INFO L414 BasicCegarLoop]: Found error trace [2020-10-25 23:11:41,300 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-25 23:11:41,300 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-10-25 23:11:41,300 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-25 23:11:41,301 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-25 23:11:41,301 INFO L82 PathProgramCache]: Analyzing trace with hash 1278191256, now seen corresponding path program 1 times [2020-10-25 23:11:41,301 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-25 23:11:41,301 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [669459052] [2020-10-25 23:11:41,302 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-25 23:11:41,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-25 23:11:41,318 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-25 23:11:41,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-25 23:11:41,332 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-25 23:11:41,361 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-25 23:11:41,361 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-10-25 23:11:41,362 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-10-25 23:11:41,403 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 25.10 11:11:41 BoogieIcfgContainer [2020-10-25 23:11:41,403 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-10-25 23:11:41,404 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-10-25 23:11:41,404 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-10-25 23:11:41,405 INFO L275 PluginConnector]: Witness Printer initialized [2020-10-25 23:11:41,406 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.10 11:11:39" (3/4) ... [2020-10-25 23:11:41,413 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2020-10-25 23:11:41,489 INFO L141 WitnessManager]: Wrote witness to /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/witness.graphml [2020-10-25 23:11:41,490 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-10-25 23:11:41,492 INFO L168 Benchmark]: Toolchain (without parser) took 2699.83 ms. Allocated memory was 52.4 MB in the beginning and 83.9 MB in the end (delta: 31.5 MB). Free memory was 29.6 MB in the beginning and 41.3 MB in the end (delta: -11.7 MB). Peak memory consumption was 22.4 MB. Max. memory is 16.1 GB. [2020-10-25 23:11:41,493 INFO L168 Benchmark]: CDTParser took 0.42 ms. Allocated memory is still 52.4 MB. Free memory was 34.2 MB in the beginning and 34.2 MB in the end (delta: 62.9 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-10-25 23:11:41,494 INFO L168 Benchmark]: CACSL2BoogieTranslator took 296.57 ms. Allocated memory is still 52.4 MB. Free memory was 28.8 MB in the beginning and 32.6 MB in the end (delta: -3.8 MB). Peak memory consumption was 7.5 MB. Max. memory is 16.1 GB. [2020-10-25 23:11:41,494 INFO L168 Benchmark]: Boogie Procedure Inliner took 36.57 ms. Allocated memory is still 52.4 MB. Free memory was 32.6 MB in the beginning and 31.3 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-10-25 23:11:41,495 INFO L168 Benchmark]: Boogie Preprocessor took 41.02 ms. Allocated memory is still 52.4 MB. Free memory was 31.3 MB in the beginning and 30.4 MB in the end (delta: 894.3 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-10-25 23:11:41,496 INFO L168 Benchmark]: RCFGBuilder took 351.70 ms. Allocated memory was 52.4 MB in the beginning and 69.2 MB in the end (delta: 16.8 MB). Free memory was 30.4 MB in the beginning and 48.6 MB in the end (delta: -18.2 MB). Peak memory consumption was 11.6 MB. Max. memory is 16.1 GB. [2020-10-25 23:11:41,496 INFO L168 Benchmark]: TraceAbstraction took 1866.20 ms. Allocated memory was 69.2 MB in the beginning and 83.9 MB in the end (delta: 14.7 MB). Free memory was 48.0 MB in the beginning and 43.9 MB in the end (delta: 4.1 MB). Peak memory consumption was 18.1 MB. Max. memory is 16.1 GB. [2020-10-25 23:11:41,497 INFO L168 Benchmark]: Witness Printer took 85.69 ms. Allocated memory is still 83.9 MB. Free memory was 43.9 MB in the beginning and 41.3 MB in the end (delta: 2.6 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. [2020-10-25 23:11:41,504 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.42 ms. Allocated memory is still 52.4 MB. Free memory was 34.2 MB in the beginning and 34.2 MB in the end (delta: 62.9 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 296.57 ms. Allocated memory is still 52.4 MB. Free memory was 28.8 MB in the beginning and 32.6 MB in the end (delta: -3.8 MB). Peak memory consumption was 7.5 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 36.57 ms. Allocated memory is still 52.4 MB. Free memory was 32.6 MB in the beginning and 31.3 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 41.02 ms. Allocated memory is still 52.4 MB. Free memory was 31.3 MB in the beginning and 30.4 MB in the end (delta: 894.3 kB). There was no memory consumed. Max. memory is 16.1 GB. * RCFGBuilder took 351.70 ms. Allocated memory was 52.4 MB in the beginning and 69.2 MB in the end (delta: 16.8 MB). Free memory was 30.4 MB in the beginning and 48.6 MB in the end (delta: -18.2 MB). Peak memory consumption was 11.6 MB. Max. memory is 16.1 GB. * TraceAbstraction took 1866.20 ms. Allocated memory was 69.2 MB in the beginning and 83.9 MB in the end (delta: 14.7 MB). Free memory was 48.0 MB in the beginning and 43.9 MB in the end (delta: 4.1 MB). Peak memory consumption was 18.1 MB. Max. memory is 16.1 GB. * Witness Printer took 85.69 ms. Allocated memory is still 83.9 MB. Free memory was 43.9 MB in the beginning and 41.3 MB in the end (delta: 2.6 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 4]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L24] unsigned int input = __VERIFIER_nondet_uint(); [L25] CALL, EXPR id(input) VAL [\old(x)=2] [L10] COND FALSE !(x==0) VAL [\old(x)=2, x=2] [L11] CALL, EXPR id2(x-1) VAL [\old(x)=1] [L17] COND FALSE !(x==0) VAL [\old(x)=1, x=1] [L18] CALL, EXPR id(x-1) VAL [\old(x)=0] [L10] COND TRUE x==0 [L10] return 0; VAL [\old(x)=0, \result=0, x=0] [L18] RET, EXPR id(x-1) VAL [\old(x)=1, id(x-1)=0, x=1] [L18] unsigned int ret = id(x-1) + 1; [L19] COND FALSE !(ret > 3) [L20] return ret; VAL [\old(x)=1, \result=1, ret=1, x=1] [L11] RET, EXPR id2(x-1) VAL [\old(x)=2, id2(x-1)=1, x=2] [L11] unsigned int ret = id2(x-1) + 1; [L12] COND FALSE !(ret > 3) [L13] return ret; VAL [\old(x)=2, \result=2, ret=2, x=2] [L25] RET, EXPR id(input) [L25] unsigned int result = id(input); [L26] COND TRUE result == 2 [L4] __assert_fail("0", "id2_b3_o2.c", 4, "reach_error") - StatisticsResult: Ultimate Automizer benchmark data CFG has 3 procedures, 25 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 1.7s, OverallIterations: 6, TraceHistogramMax: 2, AutomataDifference: 0.3s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 127 SDtfs, 13 SDslu, 492 SDs, 0 SdLazy, 99 SolverSat, 0 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 59 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=35occurred in iteration=5, 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, 5 MinimizatonAttempts, 8 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 0.8s InterpolantComputationTime, 116 NumberOfCodeBlocks, 116 NumberOfCodeBlocksAsserted, 6 NumberOfCheckSat, 87 ConstructedInterpolants, 0 QuantifiedInterpolants, 4915 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 5 InterpolantComputations, 5 PerfectInterpolantSequences, 8/8 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...