./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/recursive-simple/id_b3_o2-2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 30f4e4ab Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx12G -Xms1G -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerReach.xml -i ../sv-benchmarks/c/recursive-simple/id_b3_o2-2.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(__VERIFIER_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 3bf945356a28265a842df89cdbf40bfa9a223140 ................................................................................................................................................................................................................................................................................................................................................................................................................................... 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 0.1.24-30f4e4a [2019-11-28 00:25:40,538 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-28 00:25:40,540 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-28 00:25:40,558 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-28 00:25:40,559 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-28 00:25:40,561 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-28 00:25:40,563 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-28 00:25:40,572 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-28 00:25:40,577 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-28 00:25:40,581 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-28 00:25:40,582 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-28 00:25:40,584 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-28 00:25:40,584 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-28 00:25:40,586 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-28 00:25:40,588 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-28 00:25:40,589 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-28 00:25:40,590 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-28 00:25:40,591 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-28 00:25:40,594 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-28 00:25:40,598 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-28 00:25:40,602 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-28 00:25:40,606 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-28 00:25:40,607 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-28 00:25:40,609 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-28 00:25:40,612 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-11-28 00:25:40,612 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-11-28 00:25:40,613 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-11-28 00:25:40,614 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-11-28 00:25:40,615 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-11-28 00:25:40,616 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-11-28 00:25:40,616 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-11-28 00:25:40,617 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-11-28 00:25:40,618 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-11-28 00:25:40,618 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-11-28 00:25:40,619 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-11-28 00:25:40,619 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-11-28 00:25:40,620 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-11-28 00:25:40,621 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-11-28 00:25:40,621 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-28 00:25:40,622 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-28 00:25:40,623 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-28 00:25:40,624 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2019-11-28 00:25:40,644 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-28 00:25:40,644 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-28 00:25:40,645 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-28 00:25:40,646 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-28 00:25:40,646 INFO L138 SettingsManager]: * Use SBE=true [2019-11-28 00:25:40,646 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-28 00:25:40,647 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-28 00:25:40,647 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-28 00:25:40,647 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-28 00:25:40,648 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-28 00:25:40,648 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-28 00:25:40,648 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-28 00:25:40,648 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-28 00:25:40,649 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-28 00:25:40,649 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-28 00:25:40,649 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-28 00:25:40,649 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-28 00:25:40,650 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-28 00:25:40,650 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-28 00:25:40,650 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-28 00:25:40,651 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-28 00:25:40,651 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-28 00:25:40,651 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-28 00:25:40,652 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-28 00:25:40,652 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-28 00:25:40,652 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-28 00:25:40,652 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-28 00:25:40,653 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-28 00:25:40,653 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode 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(__VERIFIER_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 -> 3bf945356a28265a842df89cdbf40bfa9a223140 [2019-11-28 00:25:40,984 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-28 00:25:40,999 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-28 00:25:41,004 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-28 00:25:41,005 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-28 00:25:41,006 INFO L275 PluginConnector]: CDTParser initialized [2019-11-28 00:25:41,008 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/recursive-simple/id_b3_o2-2.c [2019-11-28 00:25:41,078 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e96267e19/abcfe0dfe1894ce59644741e6992c206/FLAGf8a81e2e9 [2019-11-28 00:25:41,492 INFO L306 CDTParser]: Found 1 translation units. [2019-11-28 00:25:41,492 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursive-simple/id_b3_o2-2.c [2019-11-28 00:25:41,499 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e96267e19/abcfe0dfe1894ce59644741e6992c206/FLAGf8a81e2e9 [2019-11-28 00:25:41,931 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e96267e19/abcfe0dfe1894ce59644741e6992c206 [2019-11-28 00:25:41,934 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-28 00:25:41,935 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2019-11-28 00:25:41,937 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-28 00:25:41,937 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-28 00:25:41,941 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-28 00:25:41,942 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.11 12:25:41" (1/1) ... [2019-11-28 00:25:41,945 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4877c490 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 12:25:41, skipping insertion in model container [2019-11-28 00:25:41,945 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.11 12:25:41" (1/1) ... [2019-11-28 00:25:41,953 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2019-11-28 00:25:41,976 INFO L178 MainTranslator]: Built tables and reachable declarations [2019-11-28 00:25:42,227 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-28 00:25:42,235 INFO L203 MainTranslator]: Completed pre-run [2019-11-28 00:25:42,258 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-28 00:25:42,276 INFO L208 MainTranslator]: Completed translation [2019-11-28 00:25:42,277 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 12:25:42 WrapperNode [2019-11-28 00:25:42,277 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-28 00:25:42,278 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-11-28 00:25:42,278 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-11-28 00:25:42,278 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2019-11-28 00:25:42,289 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 12:25:42" (1/1) ... [2019-11-28 00:25:42,295 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 12:25:42" (1/1) ... [2019-11-28 00:25:42,370 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-11-28 00:25:42,371 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-28 00:25:42,371 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-28 00:25:42,371 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-28 00:25:42,381 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 12:25:42" (1/1) ... [2019-11-28 00:25:42,382 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 12:25:42" (1/1) ... [2019-11-28 00:25:42,382 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 12:25:42" (1/1) ... [2019-11-28 00:25:42,383 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 12:25:42" (1/1) ... [2019-11-28 00:25:42,385 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 12:25:42" (1/1) ... [2019-11-28 00:25:42,387 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 12:25:42" (1/1) ... [2019-11-28 00:25:42,387 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 12:25:42" (1/1) ... [2019-11-28 00:25:42,389 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-28 00:25:42,389 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-28 00:25:42,389 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-28 00:25:42,390 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-28 00:25:42,391 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 12:25:42" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-28 00:25:42,465 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-28 00:25:42,466 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-28 00:25:42,466 INFO L130 BoogieDeclarations]: Found specification of procedure id [2019-11-28 00:25:42,467 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2019-11-28 00:25:42,706 INFO L292 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-28 00:25:42,706 INFO L297 CfgBuilder]: Removed 4 assume(true) statements. [2019-11-28 00:25:42,707 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 12:25:42 BoogieIcfgContainer [2019-11-28 00:25:42,707 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-28 00:25:42,708 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-28 00:25:42,708 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-28 00:25:42,712 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-28 00:25:42,712 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 28.11 12:25:41" (1/3) ... [2019-11-28 00:25:42,713 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1e6d578c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.11 12:25:42, skipping insertion in model container [2019-11-28 00:25:42,713 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 12:25:42" (2/3) ... [2019-11-28 00:25:42,714 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1e6d578c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.11 12:25:42, skipping insertion in model container [2019-11-28 00:25:42,714 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 12:25:42" (3/3) ... [2019-11-28 00:25:42,716 INFO L109 eAbstractionObserver]: Analyzing ICFG id_b3_o2-2.c [2019-11-28 00:25:42,726 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-28 00:25:42,735 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-28 00:25:42,747 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-28 00:25:42,773 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-28 00:25:42,773 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-28 00:25:42,773 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-28 00:25:42,774 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-28 00:25:42,774 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-28 00:25:42,774 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-28 00:25:42,774 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-28 00:25:42,775 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-28 00:25:42,795 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states. [2019-11-28 00:25:42,802 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2019-11-28 00:25:42,803 INFO L402 BasicCegarLoop]: Found error trace [2019-11-28 00:25:42,804 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-28 00:25:42,805 INFO L410 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-28 00:25:42,812 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-28 00:25:42,813 INFO L82 PathProgramCache]: Analyzing trace with hash -1224902363, now seen corresponding path program 1 times [2019-11-28 00:25:42,822 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-28 00:25:42,822 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1708255072] [2019-11-28 00:25:42,823 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-28 00:25:42,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 00:25:42,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 00:25:43,045 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-28 00:25:43,052 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1708255072] [2019-11-28 00:25:43,053 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-28 00:25:43,054 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-11-28 00:25:43,059 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [889732672] [2019-11-28 00:25:43,076 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-11-28 00:25:43,080 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-28 00:25:43,115 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-11-28 00:25:43,117 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-11-28 00:25:43,120 INFO L87 Difference]: Start difference. First operand 16 states. Second operand 5 states. [2019-11-28 00:25:43,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-28 00:25:43,176 INFO L93 Difference]: Finished difference Result 28 states and 31 transitions. [2019-11-28 00:25:43,177 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-11-28 00:25:43,179 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 9 [2019-11-28 00:25:43,179 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-28 00:25:43,189 INFO L225 Difference]: With dead ends: 28 [2019-11-28 00:25:43,190 INFO L226 Difference]: Without dead ends: 15 [2019-11-28 00:25:43,193 INFO L630 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 [2019-11-28 00:25:43,208 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2019-11-28 00:25:43,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2019-11-28 00:25:43,232 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2019-11-28 00:25:43,233 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2019-11-28 00:25:43,235 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 9 [2019-11-28 00:25:43,235 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-28 00:25:43,235 INFO L462 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2019-11-28 00:25:43,235 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-11-28 00:25:43,236 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2019-11-28 00:25:43,237 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-11-28 00:25:43,237 INFO L402 BasicCegarLoop]: Found error trace [2019-11-28 00:25:43,238 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-28 00:25:43,238 INFO L410 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-28 00:25:43,238 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-28 00:25:43,239 INFO L82 PathProgramCache]: Analyzing trace with hash 510739163, now seen corresponding path program 1 times [2019-11-28 00:25:43,239 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-28 00:25:43,239 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1120579486] [2019-11-28 00:25:43,240 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-28 00:25:43,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 00:25:43,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 00:25:43,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 00:25:43,387 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-28 00:25:43,387 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1120579486] [2019-11-28 00:25:43,387 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-28 00:25:43,388 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2019-11-28 00:25:43,388 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1075311928] [2019-11-28 00:25:43,390 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-11-28 00:25:43,390 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-28 00:25:43,391 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-11-28 00:25:43,391 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2019-11-28 00:25:43,391 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 7 states. [2019-11-28 00:25:43,421 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-28 00:25:43,422 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2019-11-28 00:25:43,422 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-11-28 00:25:43,422 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 16 [2019-11-28 00:25:43,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-28 00:25:43,424 INFO L225 Difference]: With dead ends: 27 [2019-11-28 00:25:43,424 INFO L226 Difference]: Without dead ends: 19 [2019-11-28 00:25:43,425 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2019-11-28 00:25:43,426 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2019-11-28 00:25:43,430 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 17. [2019-11-28 00:25:43,431 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2019-11-28 00:25:43,431 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2019-11-28 00:25:43,432 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 16 [2019-11-28 00:25:43,432 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-28 00:25:43,432 INFO L462 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2019-11-28 00:25:43,433 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-11-28 00:25:43,433 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2019-11-28 00:25:43,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-11-28 00:25:43,434 INFO L402 BasicCegarLoop]: Found error trace [2019-11-28 00:25:43,434 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-28 00:25:43,434 INFO L410 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-28 00:25:43,435 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-28 00:25:43,436 INFO L82 PathProgramCache]: Analyzing trace with hash 539368314, now seen corresponding path program 1 times [2019-11-28 00:25:43,437 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-28 00:25:43,437 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [507414640] [2019-11-28 00:25:43,437 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-28 00:25:43,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 00:25:43,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 00:25:43,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 00:25:43,635 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-28 00:25:43,636 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [507414640] [2019-11-28 00:25:43,636 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [310512963] [2019-11-28 00:25:43,636 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-28 00:25:43,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 00:25:43,695 INFO L255 TraceCheckSpWp]: Trace formula consists of 43 conjuncts, 7 conjunts are in the unsatisfiable core [2019-11-28 00:25:43,701 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-28 00:25:43,744 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-28 00:25:43,744 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-28 00:25:43,745 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2019-11-28 00:25:43,745 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [632197899] [2019-11-28 00:25:43,746 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-11-28 00:25:43,746 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-28 00:25:43,746 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-11-28 00:25:43,747 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2019-11-28 00:25:43,747 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand 9 states. [2019-11-28 00:25:43,829 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-28 00:25:43,829 INFO L93 Difference]: Finished difference Result 23 states and 25 transitions. [2019-11-28 00:25:43,830 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-11-28 00:25:43,830 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 16 [2019-11-28 00:25:43,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-28 00:25:43,831 INFO L225 Difference]: With dead ends: 23 [2019-11-28 00:25:43,832 INFO L226 Difference]: Without dead ends: 19 [2019-11-28 00:25:43,834 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2019-11-28 00:25:43,836 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2019-11-28 00:25:43,841 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2019-11-28 00:25:43,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2019-11-28 00:25:43,843 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2019-11-28 00:25:43,843 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 16 [2019-11-28 00:25:43,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-28 00:25:43,843 INFO L462 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2019-11-28 00:25:43,843 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-11-28 00:25:43,843 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2019-11-28 00:25:43,846 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2019-11-28 00:25:43,846 INFO L402 BasicCegarLoop]: Found error trace [2019-11-28 00:25:43,846 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-28 00:25:44,049 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-28 00:25:44,050 INFO L410 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-28 00:25:44,050 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-28 00:25:44,051 INFO L82 PathProgramCache]: Analyzing trace with hash -747825770, now seen corresponding path program 1 times [2019-11-28 00:25:44,051 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-28 00:25:44,052 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1668864214] [2019-11-28 00:25:44,052 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-28 00:25:44,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 00:25:44,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 00:25:44,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 00:25:44,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 00:25:44,292 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 4 proven. 4 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2019-11-28 00:25:44,293 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1668864214] [2019-11-28 00:25:44,293 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [668683565] [2019-11-28 00:25:44,293 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-28 00:25:44,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 00:25:44,329 INFO L255 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 7 conjunts are in the unsatisfiable core [2019-11-28 00:25:44,331 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-28 00:25:44,371 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 4 proven. 4 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2019-11-28 00:25:44,371 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-28 00:25:44,372 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8] total 11 [2019-11-28 00:25:44,372 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [612006159] [2019-11-28 00:25:44,373 INFO L442 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-11-28 00:25:44,373 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-28 00:25:44,373 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-11-28 00:25:44,374 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=86, Unknown=0, NotChecked=0, Total=110 [2019-11-28 00:25:44,374 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand 11 states. [2019-11-28 00:25:44,422 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-28 00:25:44,422 INFO L93 Difference]: Finished difference Result 31 states and 36 transitions. [2019-11-28 00:25:44,422 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-11-28 00:25:44,422 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 23 [2019-11-28 00:25:44,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-28 00:25:44,424 INFO L225 Difference]: With dead ends: 31 [2019-11-28 00:25:44,424 INFO L226 Difference]: Without dead ends: 23 [2019-11-28 00:25:44,425 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2019-11-28 00:25:44,425 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2019-11-28 00:25:44,430 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2019-11-28 00:25:44,430 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2019-11-28 00:25:44,431 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2019-11-28 00:25:44,431 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 23 [2019-11-28 00:25:44,431 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-28 00:25:44,431 INFO L462 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2019-11-28 00:25:44,432 INFO L463 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-11-28 00:25:44,432 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2019-11-28 00:25:44,433 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2019-11-28 00:25:44,433 INFO L402 BasicCegarLoop]: Found error trace [2019-11-28 00:25:44,433 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2019-11-28 00:25:44,645 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-28 00:25:44,646 INFO L410 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-28 00:25:44,647 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-28 00:25:44,648 INFO L82 PathProgramCache]: Analyzing trace with hash -719196619, now seen corresponding path program 2 times [2019-11-28 00:25:44,648 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-28 00:25:44,649 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [645688941] [2019-11-28 00:25:44,649 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-28 00:25:44,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-11-28 00:25:44,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-11-28 00:25:44,772 INFO L174 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2019-11-28 00:25:44,772 INFO L475 BasicCegarLoop]: Counterexample might be feasible [2019-11-28 00:25:44,810 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 28.11 12:25:44 BoogieIcfgContainer [2019-11-28 00:25:44,810 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2019-11-28 00:25:44,811 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2019-11-28 00:25:44,811 INFO L271 PluginConnector]: Initializing Witness Printer... [2019-11-28 00:25:44,811 INFO L275 PluginConnector]: Witness Printer initialized [2019-11-28 00:25:44,812 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 12:25:42" (3/4) ... [2019-11-28 00:25:44,815 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2019-11-28 00:25:44,878 INFO L141 WitnessManager]: Wrote witness to /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/witness.graphml [2019-11-28 00:25:44,878 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2019-11-28 00:25:44,880 INFO L168 Benchmark]: Toolchain (without parser) took 2944.20 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 135.3 MB). Free memory was 955.0 MB in the beginning and 1.0 GB in the end (delta: -49.4 MB). Peak memory consumption was 85.9 MB. Max. memory is 11.5 GB. [2019-11-28 00:25:44,881 INFO L168 Benchmark]: CDTParser took 0.20 ms. Allocated memory is still 1.0 GB. Free memory is still 981.8 MB. There was no memory consumed. Max. memory is 11.5 GB. [2019-11-28 00:25:44,881 INFO L168 Benchmark]: CACSL2BoogieTranslator took 340.64 ms. Allocated memory is still 1.0 GB. Free memory was 955.0 MB in the beginning and 944.3 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. [2019-11-28 00:25:44,882 INFO L168 Benchmark]: Boogie Procedure Inliner took 92.73 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 135.3 MB). Free memory was 944.3 MB in the beginning and 1.1 GB in the end (delta: -187.6 MB). Peak memory consumption was 9.8 MB. Max. memory is 11.5 GB. [2019-11-28 00:25:44,883 INFO L168 Benchmark]: Boogie Preprocessor took 18.15 ms. Allocated memory is still 1.2 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB. [2019-11-28 00:25:44,883 INFO L168 Benchmark]: RCFGBuilder took 318.17 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 19.1 MB). Peak memory consumption was 19.1 MB. Max. memory is 11.5 GB. [2019-11-28 00:25:44,884 INFO L168 Benchmark]: TraceAbstraction took 2102.07 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.0 GB in the end (delta: 101.8 MB). Peak memory consumption was 101.8 MB. Max. memory is 11.5 GB. [2019-11-28 00:25:44,885 INFO L168 Benchmark]: Witness Printer took 67.12 ms. Allocated memory is still 1.2 GB. Free memory was 1.0 GB in the beginning and 1.0 GB in the end (delta: 6.6 MB). Peak memory consumption was 6.6 MB. Max. memory is 11.5 GB. [2019-11-28 00:25:44,889 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.20 ms. Allocated memory is still 1.0 GB. Free memory is still 981.8 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 340.64 ms. Allocated memory is still 1.0 GB. Free memory was 955.0 MB in the beginning and 944.3 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. * Boogie Procedure Inliner took 92.73 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 135.3 MB). Free memory was 944.3 MB in the beginning and 1.1 GB in the end (delta: -187.6 MB). Peak memory consumption was 9.8 MB. Max. memory is 11.5 GB. * Boogie Preprocessor took 18.15 ms. Allocated memory is still 1.2 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB. * RCFGBuilder took 318.17 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 19.1 MB). Peak memory consumption was 19.1 MB. Max. memory is 11.5 GB. * TraceAbstraction took 2102.07 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.0 GB in the end (delta: 101.8 MB). Peak memory consumption was 101.8 MB. Max. memory is 11.5 GB. * Witness Printer took 67.12 ms. Allocated memory is still 1.2 GB. Free memory was 1.0 GB in the beginning and 1.0 GB in the end (delta: 6.6 MB). Peak memory consumption was 6.6 MB. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 15]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L12] int input = __VERIFIER_nondet_int(); [L13] CALL, EXPR id(input) VAL [\old(x)=2] [L5] COND FALSE !(x==0) VAL [\old(x)=2, x=2] [L6] CALL, EXPR id((unsigned int)x-1) VAL [\old(x)=1] [L5] COND FALSE !(x==0) VAL [\old(x)=1, x=1] [L6] CALL, EXPR id((unsigned int)x-1) VAL [\old(x)=0] [L5] COND TRUE x==0 [L5] return 0; VAL [\old(x)=0, \result=0, x=0] [L6] RET, EXPR id((unsigned int)x-1) VAL [\old(x)=1, id((unsigned int)x-1)=0, x=1] [L6] int ret = id((unsigned int)x-1) + 1; [L7] COND FALSE !(ret > 3) [L8] return ret; VAL [\old(x)=1, \result=1, ret=1, x=1] [L6] RET, EXPR id((unsigned int)x-1) VAL [\old(x)=2, id((unsigned int)x-1)=1, x=2] [L6] int ret = id((unsigned int)x-1) + 1; [L7] COND FALSE !(ret > 3) [L8] return ret; VAL [\old(x)=2, \result=2, ret=2, x=2] [L13] RET, EXPR id(input) [L13] int result = id(input); [L14] COND TRUE result == 2 [L15] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 2 procedures, 16 locations, 1 error locations. Result: UNSAFE, OverallTime: 2.0s, OverallIterations: 5, TraceHistogramMax: 3, AutomataDifference: 0.2s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, HoareTripleCheckerStatistics: 60 SDtfs, 11 SDslu, 269 SDs, 0 SdLazy, 86 SolverSat, 2 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 87 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.3s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=21occurred in iteration=4, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 4 MinimizatonAttempts, 4 StatesRemovedByMinimization, 2 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 0.7s InterpolantComputationTime, 126 NumberOfCodeBlocks, 126 NumberOfCodeBlocksAsserted, 7 NumberOfCheckSat, 97 ConstructedInterpolants, 0 QuantifiedInterpolants, 3223 SizeOfPredicates, 4 NumberOfNonLiveVariables, 103 ConjunctsInSsa, 14 ConjunctsInUnsatCore, 6 InterpolantComputations, 2 PerfectInterpolantSequences, 30/42 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...