./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/array-fpi/s4iff.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/array-fpi/s4iff.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 98b440d2018d3020f67dce8008e7aad4265ed1f1 ..................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... 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 19:31:33,113 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-25 19:31:33,119 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-25 19:31:33,178 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-10-25 19:31:33,179 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-10-25 19:31:33,184 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-10-25 19:31:33,189 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-10-25 19:31:33,196 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-10-25 19:31:33,203 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-10-25 19:31:33,210 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-10-25 19:31:33,212 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-10-25 19:31:33,213 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-10-25 19:31:33,214 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-25 19:31:33,218 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-25 19:31:33,219 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-25 19:31:33,221 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-25 19:31:33,223 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-25 19:31:33,226 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-25 19:31:33,230 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-25 19:31:33,241 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-25 19:31:33,243 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-25 19:31:33,245 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-25 19:31:33,248 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-25 19:31:33,250 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-25 19:31:33,259 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-10-25 19:31:33,260 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-10-25 19:31:33,260 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-10-25 19:31:33,263 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-10-25 19:31:33,263 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-10-25 19:31:33,265 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-10-25 19:31:33,265 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-10-25 19:31:33,267 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-10-25 19:31:33,269 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-10-25 19:31:33,270 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-10-25 19:31:33,272 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-10-25 19:31:33,272 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-10-25 19:31:33,273 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-10-25 19:31:33,274 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-10-25 19:31:33,274 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-10-25 19:31:33,277 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-10-25 19:31:33,278 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-10-25 19:31:33,279 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2020-10-25 19:31:33,334 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-25 19:31:33,335 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-25 19:31:33,338 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-10-25 19:31:33,338 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-10-25 19:31:33,339 INFO L138 SettingsManager]: * Use SBE=true [2020-10-25 19:31:33,339 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-25 19:31:33,339 INFO L138 SettingsManager]: * sizeof long=4 [2020-10-25 19:31:33,340 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-25 19:31:33,340 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-10-25 19:31:33,340 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-25 19:31:33,341 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-10-25 19:31:33,342 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-10-25 19:31:33,342 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-10-25 19:31:33,342 INFO L138 SettingsManager]: * sizeof long double=12 [2020-10-25 19:31:33,342 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-25 19:31:33,343 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-25 19:31:33,343 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-10-25 19:31:33,343 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-25 19:31:33,343 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-10-25 19:31:33,344 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-10-25 19:31:33,344 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-10-25 19:31:33,344 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-25 19:31:33,345 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-25 19:31:33,345 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-10-25 19:31:33,345 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-10-25 19:31:33,345 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-10-25 19:31:33,346 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-10-25 19:31:33,346 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-10-25 19:31:33,346 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-10-25 19:31:33,346 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 98b440d2018d3020f67dce8008e7aad4265ed1f1 [2020-10-25 19:31:33,775 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-25 19:31:33,821 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-25 19:31:33,824 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-25 19:31:33,826 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-25 19:31:33,827 INFO L275 PluginConnector]: CDTParser initialized [2020-10-25 19:31:33,827 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-fpi/s4iff.c [2020-10-25 19:31:33,916 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a2d33cfdd/e1c90a3dc6134b6c9acaeb01812f7352/FLAGc0883cf5c [2020-10-25 19:31:34,586 INFO L306 CDTParser]: Found 1 translation units. [2020-10-25 19:31:34,586 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-fpi/s4iff.c [2020-10-25 19:31:34,595 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a2d33cfdd/e1c90a3dc6134b6c9acaeb01812f7352/FLAGc0883cf5c [2020-10-25 19:31:34,941 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a2d33cfdd/e1c90a3dc6134b6c9acaeb01812f7352 [2020-10-25 19:31:34,946 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-25 19:31:34,953 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-10-25 19:31:34,957 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-25 19:31:34,957 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-25 19:31:34,961 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-25 19:31:34,962 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.10 07:31:34" (1/1) ... [2020-10-25 19:31:34,977 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4aa3571b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.10 07:31:34, skipping insertion in model container [2020-10-25 19:31:34,977 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.10 07:31:34" (1/1) ... [2020-10-25 19:31:34,987 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-25 19:31:35,007 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-25 19:31:35,189 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-25 19:31:35,200 INFO L203 MainTranslator]: Completed pre-run [2020-10-25 19:31:35,227 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-25 19:31:35,246 INFO L208 MainTranslator]: Completed translation [2020-10-25 19:31:35,247 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.10 07:31:35 WrapperNode [2020-10-25 19:31:35,248 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-25 19:31:35,249 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-10-25 19:31:35,250 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-10-25 19:31:35,250 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-10-25 19:31:35,260 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.10 07:31:35" (1/1) ... [2020-10-25 19:31:35,270 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.10 07:31:35" (1/1) ... [2020-10-25 19:31:35,296 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-10-25 19:31:35,297 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-25 19:31:35,297 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-25 19:31:35,297 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-25 19:31:35,308 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.10 07:31:35" (1/1) ... [2020-10-25 19:31:35,309 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.10 07:31:35" (1/1) ... [2020-10-25 19:31:35,311 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.10 07:31:35" (1/1) ... [2020-10-25 19:31:35,312 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.10 07:31:35" (1/1) ... [2020-10-25 19:31:35,319 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.10 07:31:35" (1/1) ... [2020-10-25 19:31:35,324 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.10 07:31:35" (1/1) ... [2020-10-25 19:31:35,326 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.10 07:31:35" (1/1) ... [2020-10-25 19:31:35,329 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-25 19:31:35,330 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-25 19:31:35,331 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-25 19:31:35,331 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-25 19:31:35,332 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.10 07:31:35" (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 19:31:35,427 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-10-25 19:31:35,428 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-10-25 19:31:35,428 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-10-25 19:31:35,428 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-10-25 19:31:35,428 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-25 19:31:35,429 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-25 19:31:35,429 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-10-25 19:31:35,429 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-10-25 19:31:35,779 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-25 19:31:35,780 INFO L298 CfgBuilder]: Removed 12 assume(true) statements. [2020-10-25 19:31:35,782 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.10 07:31:35 BoogieIcfgContainer [2020-10-25 19:31:35,782 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-25 19:31:35,784 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-10-25 19:31:35,784 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-10-25 19:31:35,788 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-10-25 19:31:35,788 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.10 07:31:34" (1/3) ... [2020-10-25 19:31:35,789 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1407ec0f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.10 07:31:35, skipping insertion in model container [2020-10-25 19:31:35,789 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.10 07:31:35" (2/3) ... [2020-10-25 19:31:35,790 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1407ec0f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.10 07:31:35, skipping insertion in model container [2020-10-25 19:31:35,790 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.10 07:31:35" (3/3) ... [2020-10-25 19:31:35,792 INFO L111 eAbstractionObserver]: Analyzing ICFG s4iff.c [2020-10-25 19:31:35,804 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-10-25 19:31:35,809 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-10-25 19:31:35,829 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-10-25 19:31:35,857 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-10-25 19:31:35,857 INFO L378 AbstractCegarLoop]: Hoare is true [2020-10-25 19:31:35,857 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-10-25 19:31:35,858 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-25 19:31:35,858 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-25 19:31:35,858 INFO L382 AbstractCegarLoop]: Difference is false [2020-10-25 19:31:35,858 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-25 19:31:35,858 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-10-25 19:31:35,873 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-10-25 19:31:35,882 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-10-25 19:31:35,887 INFO L414 BasicCegarLoop]: Found error trace [2020-10-25 19:31:35,888 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-25 19:31:35,889 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-25 19:31:35,896 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-25 19:31:35,896 INFO L82 PathProgramCache]: Analyzing trace with hash 356661439, now seen corresponding path program 1 times [2020-10-25 19:31:35,908 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-25 19:31:35,909 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1581735018] [2020-10-25 19:31:35,909 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-25 19:31:36,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 19:31:36,091 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 19:31:36,092 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1581735018] [2020-10-25 19:31:36,093 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-25 19:31:36,093 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-10-25 19:31:36,094 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1539138972] [2020-10-25 19:31:36,099 INFO L461 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-10-25 19:31:36,099 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-25 19:31:36,114 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-10-25 19:31:36,115 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-10-25 19:31:36,118 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 2 states. [2020-10-25 19:31:36,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-25 19:31:36,137 INFO L93 Difference]: Finished difference Result 35 states and 47 transitions. [2020-10-25 19:31:36,138 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-10-25 19:31:36,139 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 11 [2020-10-25 19:31:36,140 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-25 19:31:36,149 INFO L225 Difference]: With dead ends: 35 [2020-10-25 19:31:36,150 INFO L226 Difference]: Without dead ends: 15 [2020-10-25 19:31:36,153 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-10-25 19:31:36,172 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-10-25 19:31:36,187 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-10-25 19:31:36,188 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-10-25 19:31:36,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-10-25 19:31:36,191 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 11 [2020-10-25 19:31:36,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-25 19:31:36,191 INFO L481 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-10-25 19:31:36,192 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-10-25 19:31:36,192 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-10-25 19:31:36,193 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-10-25 19:31:36,193 INFO L414 BasicCegarLoop]: Found error trace [2020-10-25 19:31:36,193 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-25 19:31:36,193 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-10-25 19:31:36,194 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-25 19:31:36,195 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-25 19:31:36,195 INFO L82 PathProgramCache]: Analyzing trace with hash -452685187, now seen corresponding path program 1 times [2020-10-25 19:31:36,195 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-25 19:31:36,196 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2011464543] [2020-10-25 19:31:36,196 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-25 19:31:36,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 19:31:36,286 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 19:31:36,287 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2011464543] [2020-10-25 19:31:36,287 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-25 19:31:36,287 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-10-25 19:31:36,288 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1442254379] [2020-10-25 19:31:36,289 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-25 19:31:36,290 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-25 19:31:36,291 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-25 19:31:36,291 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-10-25 19:31:36,291 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 4 states. [2020-10-25 19:31:36,386 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-25 19:31:36,386 INFO L93 Difference]: Finished difference Result 28 states and 34 transitions. [2020-10-25 19:31:36,387 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-10-25 19:31:36,387 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 11 [2020-10-25 19:31:36,388 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-25 19:31:36,388 INFO L225 Difference]: With dead ends: 28 [2020-10-25 19:31:36,389 INFO L226 Difference]: Without dead ends: 20 [2020-10-25 19:31:36,390 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-10-25 19:31:36,391 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-10-25 19:31:36,394 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 17. [2020-10-25 19:31:36,395 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-10-25 19:31:36,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2020-10-25 19:31:36,396 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 11 [2020-10-25 19:31:36,396 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-25 19:31:36,397 INFO L481 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2020-10-25 19:31:36,397 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-25 19:31:36,397 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2020-10-25 19:31:36,398 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-10-25 19:31:36,398 INFO L414 BasicCegarLoop]: Found error trace [2020-10-25 19:31:36,398 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-25 19:31:36,399 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-10-25 19:31:36,399 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-25 19:31:36,400 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-25 19:31:36,400 INFO L82 PathProgramCache]: Analyzing trace with hash 623611495, now seen corresponding path program 1 times [2020-10-25 19:31:36,400 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-25 19:31:36,401 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [774842704] [2020-10-25 19:31:36,401 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-25 19:31:36,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 19:31:37,147 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 30 [2020-10-25 19:31:37,199 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-25 19:31:37,199 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [774842704] [2020-10-25 19:31:37,200 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1920484155] [2020-10-25 19:31:37,200 INFO L95 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 [2020-10-25 19:31:37,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 19:31:37,287 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 19 conjunts are in the unsatisfiable core [2020-10-25 19:31:37,293 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-25 19:31:37,401 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2020-10-25 19:31:37,403 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-10-25 19:31:37,422 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-10-25 19:31:37,423 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-10-25 19:31:37,423 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:23, output treesize:19 [2020-10-25 19:31:37,509 INFO L190 IndexEqualityManager]: detected not equals via solver [2020-10-25 19:31:37,512 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2020-10-25 19:31:37,513 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-10-25 19:31:37,533 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-10-25 19:31:37,534 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-10-25 19:31:37,534 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:34, output treesize:30 [2020-10-25 19:31:37,997 INFO L190 IndexEqualityManager]: detected not equals via solver [2020-10-25 19:31:38,010 INFO L350 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2020-10-25 19:31:38,010 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 55 treesize of output 57 [2020-10-25 19:31:38,013 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-10-25 19:31:38,082 INFO L625 ElimStorePlain]: treesize reduction 22, result has 71.1 percent of original size [2020-10-25 19:31:38,100 INFO L545 ElimStorePlain]: Start of recursive call 1: 4 dim-0 vars, 1 dim-2 vars, End of recursive call: 4 dim-0 vars, and 1 xjuncts. [2020-10-25 19:31:38,101 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 5 variables, input treesize:71, output treesize:54 [2020-10-25 19:31:38,380 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-25 19:31:38,402 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-10-25 19:31:38,597 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-25 19:31:38,598 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-10-25 19:31:38,598 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 17 [2020-10-25 19:31:38,598 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [467241770] [2020-10-25 19:31:38,599 INFO L461 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-10-25 19:31:38,599 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-25 19:31:38,600 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-10-25 19:31:38,601 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=219, Unknown=0, NotChecked=0, Total=272 [2020-10-25 19:31:38,601 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand 17 states. [2020-10-25 19:31:40,464 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-25 19:31:40,464 INFO L93 Difference]: Finished difference Result 35 states and 42 transitions. [2020-10-25 19:31:40,465 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-10-25 19:31:40,465 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 16 [2020-10-25 19:31:40,465 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-25 19:31:40,468 INFO L225 Difference]: With dead ends: 35 [2020-10-25 19:31:40,468 INFO L226 Difference]: Without dead ends: 26 [2020-10-25 19:31:40,469 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 9 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 112 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=135, Invalid=465, Unknown=0, NotChecked=0, Total=600 [2020-10-25 19:31:40,470 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-10-25 19:31:40,474 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 23. [2020-10-25 19:31:40,475 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-10-25 19:31:40,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 26 transitions. [2020-10-25 19:31:40,476 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 26 transitions. Word has length 16 [2020-10-25 19:31:40,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-25 19:31:40,476 INFO L481 AbstractCegarLoop]: Abstraction has 23 states and 26 transitions. [2020-10-25 19:31:40,476 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-10-25 19:31:40,477 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 26 transitions. [2020-10-25 19:31:40,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-10-25 19:31:40,478 INFO L414 BasicCegarLoop]: Found error trace [2020-10-25 19:31:40,478 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-25 19:31:40,692 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2020-10-25 19:31:40,693 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-25 19:31:40,694 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-25 19:31:40,695 INFO L82 PathProgramCache]: Analyzing trace with hash -1137819675, now seen corresponding path program 2 times [2020-10-25 19:31:40,695 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-25 19:31:40,696 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [188028836] [2020-10-25 19:31:40,696 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-25 19:31:40,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 19:31:40,782 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-25 19:31:40,782 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [188028836] [2020-10-25 19:31:40,783 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1461262891] [2020-10-25 19:31:40,783 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 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 [2020-10-25 19:31:40,860 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-10-25 19:31:40,861 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-10-25 19:31:40,862 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 6 conjunts are in the unsatisfiable core [2020-10-25 19:31:40,866 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-25 19:31:40,940 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-25 19:31:40,941 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-10-25 19:31:40,941 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-10-25 19:31:40,942 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [46360564] [2020-10-25 19:31:40,942 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-10-25 19:31:40,942 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-25 19:31:40,943 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-10-25 19:31:40,944 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2020-10-25 19:31:40,944 INFO L87 Difference]: Start difference. First operand 23 states and 26 transitions. Second operand 10 states. [2020-10-25 19:31:41,166 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-25 19:31:41,166 INFO L93 Difference]: Finished difference Result 33 states and 38 transitions. [2020-10-25 19:31:41,167 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-10-25 19:31:41,167 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 18 [2020-10-25 19:31:41,167 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-25 19:31:41,168 INFO L225 Difference]: With dead ends: 33 [2020-10-25 19:31:41,168 INFO L226 Difference]: Without dead ends: 29 [2020-10-25 19:31:41,169 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=57, Invalid=125, Unknown=0, NotChecked=0, Total=182 [2020-10-25 19:31:41,169 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-10-25 19:31:41,183 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 25. [2020-10-25 19:31:41,185 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-10-25 19:31:41,186 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 29 transitions. [2020-10-25 19:31:41,186 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 29 transitions. Word has length 18 [2020-10-25 19:31:41,187 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-25 19:31:41,187 INFO L481 AbstractCegarLoop]: Abstraction has 25 states and 29 transitions. [2020-10-25 19:31:41,187 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-10-25 19:31:41,187 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 29 transitions. [2020-10-25 19:31:41,188 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-10-25 19:31:41,188 INFO L414 BasicCegarLoop]: Found error trace [2020-10-25 19:31:41,188 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-25 19:31:41,401 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-25 19:31:41,402 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-25 19:31:41,403 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-25 19:31:41,403 INFO L82 PathProgramCache]: Analyzing trace with hash -479454913, now seen corresponding path program 3 times [2020-10-25 19:31:41,403 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-25 19:31:41,404 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2001851729] [2020-10-25 19:31:41,404 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-25 19:31:41,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 19:31:41,503 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-25 19:31:41,504 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2001851729] [2020-10-25 19:31:41,504 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [699344519] [2020-10-25 19:31:41,504 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-25 19:31:41,572 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2020-10-25 19:31:41,572 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-10-25 19:31:41,573 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 6 conjunts are in the unsatisfiable core [2020-10-25 19:31:41,575 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-25 19:31:41,640 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-25 19:31:41,642 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-10-25 19:31:41,642 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-10-25 19:31:41,643 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1810452374] [2020-10-25 19:31:41,643 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-10-25 19:31:41,644 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-25 19:31:41,647 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-10-25 19:31:41,649 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2020-10-25 19:31:41,650 INFO L87 Difference]: Start difference. First operand 25 states and 29 transitions. Second operand 10 states. [2020-10-25 19:31:41,813 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-25 19:31:41,813 INFO L93 Difference]: Finished difference Result 37 states and 43 transitions. [2020-10-25 19:31:41,815 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-10-25 19:31:41,815 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 19 [2020-10-25 19:31:41,816 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-25 19:31:41,816 INFO L225 Difference]: With dead ends: 37 [2020-10-25 19:31:41,816 INFO L226 Difference]: Without dead ends: 25 [2020-10-25 19:31:41,817 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2020-10-25 19:31:41,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-10-25 19:31:41,830 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 22. [2020-10-25 19:31:41,830 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-10-25 19:31:41,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 25 transitions. [2020-10-25 19:31:41,831 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 25 transitions. Word has length 19 [2020-10-25 19:31:41,831 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-25 19:31:41,831 INFO L481 AbstractCegarLoop]: Abstraction has 22 states and 25 transitions. [2020-10-25 19:31:41,831 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-10-25 19:31:41,831 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 25 transitions. [2020-10-25 19:31:41,834 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-10-25 19:31:41,834 INFO L414 BasicCegarLoop]: Found error trace [2020-10-25 19:31:41,835 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-25 19:31:42,047 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-25 19:31:42,048 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-25 19:31:42,049 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-25 19:31:42,049 INFO L82 PathProgramCache]: Analyzing trace with hash 634982145, now seen corresponding path program 4 times [2020-10-25 19:31:42,050 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-25 19:31:42,051 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1523110997] [2020-10-25 19:31:42,051 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-25 19:31:42,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-25 19:31:42,102 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-25 19:31:42,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-25 19:31:42,147 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-25 19:31:42,172 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-25 19:31:42,172 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-10-25 19:31:42,173 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-10-25 19:31:42,217 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 25.10 07:31:42 BoogieIcfgContainer [2020-10-25 19:31:42,217 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-10-25 19:31:42,218 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-10-25 19:31:42,218 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-10-25 19:31:42,218 INFO L275 PluginConnector]: Witness Printer initialized [2020-10-25 19:31:42,219 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.10 07:31:35" (3/4) ... [2020-10-25 19:31:42,222 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2020-10-25 19:31:42,286 INFO L141 WitnessManager]: Wrote witness to /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/witness.graphml [2020-10-25 19:31:42,286 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-10-25 19:31:42,288 INFO L168 Benchmark]: Toolchain (without parser) took 7338.77 ms. Allocated memory was 44.0 MB in the beginning and 98.6 MB in the end (delta: 54.5 MB). Free memory was 21.1 MB in the beginning and 40.9 MB in the end (delta: -19.8 MB). Peak memory consumption was 36.0 MB. Max. memory is 16.1 GB. [2020-10-25 19:31:42,288 INFO L168 Benchmark]: CDTParser took 0.16 ms. Allocated memory is still 44.0 MB. Free memory is still 22.3 MB. There was no memory consumed. Max. memory is 16.1 GB. [2020-10-25 19:31:42,289 INFO L168 Benchmark]: CACSL2BoogieTranslator took 291.65 ms. Allocated memory was 44.0 MB in the beginning and 54.5 MB in the end (delta: 10.5 MB). Free memory was 20.5 MB in the beginning and 30.4 MB in the end (delta: -9.9 MB). Peak memory consumption was 5.4 MB. Max. memory is 16.1 GB. [2020-10-25 19:31:42,290 INFO L168 Benchmark]: Boogie Procedure Inliner took 46.90 ms. Allocated memory is still 54.5 MB. Free memory was 30.4 MB in the beginning and 28.9 MB in the end (delta: 1.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-10-25 19:31:42,291 INFO L168 Benchmark]: Boogie Preprocessor took 32.50 ms. Allocated memory is still 54.5 MB. Free memory was 28.9 MB in the beginning and 27.6 MB in the end (delta: 1.3 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-10-25 19:31:42,292 INFO L168 Benchmark]: RCFGBuilder took 451.81 ms. Allocated memory is still 54.5 MB. Free memory was 27.6 MB in the beginning and 26.6 MB in the end (delta: 963.1 kB). Peak memory consumption was 5.5 MB. Max. memory is 16.1 GB. [2020-10-25 19:31:42,293 INFO L168 Benchmark]: TraceAbstraction took 6433.76 ms. Allocated memory was 54.5 MB in the beginning and 98.6 MB in the end (delta: 44.0 MB). Free memory was 26.2 MB in the beginning and 43.1 MB in the end (delta: -16.9 MB). Peak memory consumption was 27.3 MB. Max. memory is 16.1 GB. [2020-10-25 19:31:42,294 INFO L168 Benchmark]: Witness Printer took 68.40 ms. Allocated memory is still 98.6 MB. Free memory was 43.1 MB in the beginning and 40.9 MB in the end (delta: 2.2 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-10-25 19:31:42,298 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.16 ms. Allocated memory is still 44.0 MB. Free memory is still 22.3 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 291.65 ms. Allocated memory was 44.0 MB in the beginning and 54.5 MB in the end (delta: 10.5 MB). Free memory was 20.5 MB in the beginning and 30.4 MB in the end (delta: -9.9 MB). Peak memory consumption was 5.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 46.90 ms. Allocated memory is still 54.5 MB. Free memory was 30.4 MB in the beginning and 28.9 MB in the end (delta: 1.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 32.50 ms. Allocated memory is still 54.5 MB. Free memory was 28.9 MB in the beginning and 27.6 MB in the end (delta: 1.3 MB). There was no memory consumed. Max. memory is 16.1 GB. * RCFGBuilder took 451.81 ms. Allocated memory is still 54.5 MB. Free memory was 27.6 MB in the beginning and 26.6 MB in the end (delta: 963.1 kB). Peak memory consumption was 5.5 MB. Max. memory is 16.1 GB. * TraceAbstraction took 6433.76 ms. Allocated memory was 54.5 MB in the beginning and 98.6 MB in the end (delta: 44.0 MB). Free memory was 26.2 MB in the beginning and 43.1 MB in the end (delta: -16.9 MB). Peak memory consumption was 27.3 MB. Max. memory is 16.1 GB. * Witness Printer took 68.40 ms. Allocated memory is still 98.6 MB. Free memory was 43.1 MB in the beginning and 40.9 MB in the end (delta: 2.2 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 10]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L19] int N; VAL [N=0] [L23] N = __VERIFIER_nondet_int() [L24] COND FALSE !(N <= 0) [L13] COND FALSE !(!cond) VAL [N=2] [L27] int i; [L28] long long sum[1]; [L29] int *a = malloc(sizeof(int)*N); [L31] sum[0] = 1 [L32] i=0 VAL [N=2] [L32] COND TRUE i