./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/loops/invert_string-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 9a8b2e8d 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_1.3.100.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/loops/invert_string-1.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 1b9a71645175fee79e6d6cd797db38ce6044ffb9 ..................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... 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 0.1.25-9a8b2e8 [2020-10-20 00:54:38,324 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-20 00:54:38,327 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-20 00:54:38,367 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-10-20 00:54:38,368 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-10-20 00:54:38,380 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-10-20 00:54:38,381 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-10-20 00:54:38,394 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-10-20 00:54:38,398 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-10-20 00:54:38,398 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-10-20 00:54:38,402 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-10-20 00:54:38,403 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-10-20 00:54:38,404 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-20 00:54:38,407 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-20 00:54:38,409 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-20 00:54:38,410 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-20 00:54:38,411 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-20 00:54:38,411 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-20 00:54:38,412 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-20 00:54:38,414 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-20 00:54:38,417 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-20 00:54:38,418 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-20 00:54:38,419 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-20 00:54:38,421 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-20 00:54:38,423 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-10-20 00:54:38,427 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-10-20 00:54:38,428 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-10-20 00:54:38,429 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-10-20 00:54:38,430 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-10-20 00:54:38,431 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-10-20 00:54:38,433 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-10-20 00:54:38,434 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-10-20 00:54:38,434 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-10-20 00:54:38,435 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-10-20 00:54:38,436 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-10-20 00:54:38,437 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-10-20 00:54:38,438 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-10-20 00:54:38,438 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-10-20 00:54:38,438 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-10-20 00:54:38,439 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-10-20 00:54:38,441 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-10-20 00:54:38,441 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2020-10-20 00:54:38,483 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-20 00:54:38,483 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-20 00:54:38,484 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-10-20 00:54:38,484 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-10-20 00:54:38,485 INFO L138 SettingsManager]: * Use SBE=true [2020-10-20 00:54:38,485 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-20 00:54:38,485 INFO L138 SettingsManager]: * sizeof long=4 [2020-10-20 00:54:38,485 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-20 00:54:38,486 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-10-20 00:54:38,486 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-20 00:54:38,486 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-10-20 00:54:38,486 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-10-20 00:54:38,487 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-10-20 00:54:38,487 INFO L138 SettingsManager]: * sizeof long double=12 [2020-10-20 00:54:38,487 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-20 00:54:38,487 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-20 00:54:38,488 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-10-20 00:54:38,489 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-20 00:54:38,489 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-10-20 00:54:38,490 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-10-20 00:54:38,490 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-10-20 00:54:38,490 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-20 00:54:38,490 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-20 00:54:38,491 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-10-20 00:54:38,491 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-10-20 00:54:38,491 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-10-20 00:54:38,492 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-10-20 00:54:38,492 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-10-20 00:54:38,492 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-10-20 00:54:38,492 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(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 -> 1b9a71645175fee79e6d6cd797db38ce6044ffb9 [2020-10-20 00:54:38,674 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-20 00:54:38,699 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-20 00:54:38,704 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-20 00:54:38,706 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-20 00:54:38,706 INFO L275 PluginConnector]: CDTParser initialized [2020-10-20 00:54:38,707 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/loops/invert_string-1.c [2020-10-20 00:54:38,779 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fbf0617f0/bb99bf350cb34786aec8f8346e68a289/FLAG282c03d7c [2020-10-20 00:54:39,244 INFO L306 CDTParser]: Found 1 translation units. [2020-10-20 00:54:39,245 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/loops/invert_string-1.c [2020-10-20 00:54:39,253 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fbf0617f0/bb99bf350cb34786aec8f8346e68a289/FLAG282c03d7c [2020-10-20 00:54:39,676 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fbf0617f0/bb99bf350cb34786aec8f8346e68a289 [2020-10-20 00:54:39,680 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-20 00:54:39,687 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-10-20 00:54:39,689 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-20 00:54:39,689 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-20 00:54:39,693 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-20 00:54:39,693 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.10 12:54:39" (1/1) ... [2020-10-20 00:54:39,697 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@68a45c4b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 12:54:39, skipping insertion in model container [2020-10-20 00:54:39,697 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.10 12:54:39" (1/1) ... [2020-10-20 00:54:39,706 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-20 00:54:39,727 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-20 00:54:39,980 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-20 00:54:39,989 INFO L203 MainTranslator]: Completed pre-run [2020-10-20 00:54:40,011 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-20 00:54:40,026 INFO L208 MainTranslator]: Completed translation [2020-10-20 00:54:40,026 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 12:54:40 WrapperNode [2020-10-20 00:54:40,027 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-20 00:54:40,027 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-10-20 00:54:40,027 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-10-20 00:54:40,028 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-10-20 00:54:40,036 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 12:54:40" (1/1) ... [2020-10-20 00:54:40,044 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 12:54:40" (1/1) ... [2020-10-20 00:54:40,066 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-10-20 00:54:40,067 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-20 00:54:40,067 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-20 00:54:40,067 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-20 00:54:40,074 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 12:54:40" (1/1) ... [2020-10-20 00:54:40,074 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 12:54:40" (1/1) ... [2020-10-20 00:54:40,077 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 12:54:40" (1/1) ... [2020-10-20 00:54:40,077 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 12:54:40" (1/1) ... [2020-10-20 00:54:40,083 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 12:54:40" (1/1) ... [2020-10-20 00:54:40,088 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 12:54:40" (1/1) ... [2020-10-20 00:54:40,090 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 12:54:40" (1/1) ... [2020-10-20 00:54:40,092 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-20 00:54:40,092 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-20 00:54:40,093 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-20 00:54:40,093 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-20 00:54:40,094 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 12:54:40" (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 [2020-10-20 00:54:40,156 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-10-20 00:54:40,157 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-10-20 00:54:40,157 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-10-20 00:54:40,158 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-20 00:54:40,158 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-20 00:54:40,158 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-10-20 00:54:40,159 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-10-20 00:54:40,404 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-20 00:54:40,404 INFO L298 CfgBuilder]: Removed 11 assume(true) statements. [2020-10-20 00:54:40,406 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.10 12:54:40 BoogieIcfgContainer [2020-10-20 00:54:40,406 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-20 00:54:40,408 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-10-20 00:54:40,408 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-10-20 00:54:40,412 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-10-20 00:54:40,412 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.10 12:54:39" (1/3) ... [2020-10-20 00:54:40,413 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4d9e2075 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.10 12:54:40, skipping insertion in model container [2020-10-20 00:54:40,413 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 12:54:40" (2/3) ... [2020-10-20 00:54:40,414 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4d9e2075 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.10 12:54:40, skipping insertion in model container [2020-10-20 00:54:40,414 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.10 12:54:40" (3/3) ... [2020-10-20 00:54:40,416 INFO L111 eAbstractionObserver]: Analyzing ICFG invert_string-1.c [2020-10-20 00:54:40,428 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-10-20 00:54:40,436 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-10-20 00:54:40,457 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-10-20 00:54:40,488 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-10-20 00:54:40,489 INFO L378 AbstractCegarLoop]: Hoare is true [2020-10-20 00:54:40,489 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-10-20 00:54:40,489 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-20 00:54:40,489 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-20 00:54:40,489 INFO L382 AbstractCegarLoop]: Difference is false [2020-10-20 00:54:40,490 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-20 00:54:40,490 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-10-20 00:54:40,514 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2020-10-20 00:54:40,521 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-10-20 00:54:40,521 INFO L414 BasicCegarLoop]: Found error trace [2020-10-20 00:54:40,522 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-20 00:54:40,523 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-20 00:54:40,529 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 00:54:40,529 INFO L82 PathProgramCache]: Analyzing trace with hash -56209308, now seen corresponding path program 1 times [2020-10-20 00:54:40,540 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-20 00:54:40,541 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [143011373] [2020-10-20 00:54:40,541 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-20 00:54:40,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 00:54:40,694 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-20 00:54:40,695 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [143011373] [2020-10-20 00:54:40,696 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-20 00:54:40,697 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-10-20 00:54:40,698 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [973238977] [2020-10-20 00:54:40,702 INFO L461 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-10-20 00:54:40,703 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-20 00:54:40,716 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-10-20 00:54:40,717 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-10-20 00:54:40,719 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 2 states. [2020-10-20 00:54:40,738 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-20 00:54:40,739 INFO L93 Difference]: Finished difference Result 38 states and 51 transitions. [2020-10-20 00:54:40,739 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-10-20 00:54:40,740 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 11 [2020-10-20 00:54:40,741 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-20 00:54:40,750 INFO L225 Difference]: With dead ends: 38 [2020-10-20 00:54:40,751 INFO L226 Difference]: Without dead ends: 16 [2020-10-20 00:54:40,754 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 [2020-10-20 00:54:40,772 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-10-20 00:54:40,786 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-10-20 00:54:40,787 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-10-20 00:54:40,788 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-10-20 00:54:40,790 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 11 [2020-10-20 00:54:40,790 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-20 00:54:40,790 INFO L481 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-10-20 00:54:40,790 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-10-20 00:54:40,791 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-10-20 00:54:40,791 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-10-20 00:54:40,791 INFO L414 BasicCegarLoop]: Found error trace [2020-10-20 00:54:40,792 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-20 00:54:40,792 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-10-20 00:54:40,793 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-20 00:54:40,793 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 00:54:40,793 INFO L82 PathProgramCache]: Analyzing trace with hash -411746854, now seen corresponding path program 1 times [2020-10-20 00:54:40,794 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-20 00:54:40,794 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [711439864] [2020-10-20 00:54:40,794 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-20 00:54:40,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 00:54:40,886 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-20 00:54:40,887 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [711439864] [2020-10-20 00:54:40,887 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-20 00:54:40,887 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-10-20 00:54:40,887 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [588391089] [2020-10-20 00:54:40,889 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-20 00:54:40,890 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-20 00:54:40,890 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-20 00:54:40,891 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-10-20 00:54:40,891 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 4 states. [2020-10-20 00:54:40,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-20 00:54:40,942 INFO L93 Difference]: Finished difference Result 34 states and 38 transitions. [2020-10-20 00:54:40,943 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-10-20 00:54:40,943 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 11 [2020-10-20 00:54:40,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-20 00:54:40,944 INFO L225 Difference]: With dead ends: 34 [2020-10-20 00:54:40,944 INFO L226 Difference]: Without dead ends: 24 [2020-10-20 00:54:40,945 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 [2020-10-20 00:54:40,946 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-10-20 00:54:40,950 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 17. [2020-10-20 00:54:40,950 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-10-20 00:54:40,951 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2020-10-20 00:54:40,951 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 11 [2020-10-20 00:54:40,951 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-20 00:54:40,952 INFO L481 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2020-10-20 00:54:40,952 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-20 00:54:40,952 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2020-10-20 00:54:40,953 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-10-20 00:54:40,953 INFO L414 BasicCegarLoop]: Found error trace [2020-10-20 00:54:40,953 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-20 00:54:40,953 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-10-20 00:54:40,954 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-20 00:54:40,954 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 00:54:40,954 INFO L82 PathProgramCache]: Analyzing trace with hash 1790951096, now seen corresponding path program 1 times [2020-10-20 00:54:40,954 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-20 00:54:40,955 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [594085915] [2020-10-20 00:54:40,955 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-20 00:54:40,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 00:54:41,049 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-10-20 00:54:41,049 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [594085915] [2020-10-20 00:54:41,050 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-20 00:54:41,050 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-10-20 00:54:41,050 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2014128944] [2020-10-20 00:54:41,051 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-20 00:54:41,051 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-20 00:54:41,051 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-20 00:54:41,052 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-20 00:54:41,052 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand 4 states. [2020-10-20 00:54:41,113 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-20 00:54:41,113 INFO L93 Difference]: Finished difference Result 25 states and 28 transitions. [2020-10-20 00:54:41,114 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-10-20 00:54:41,114 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 13 [2020-10-20 00:54:41,114 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-20 00:54:41,115 INFO L225 Difference]: With dead ends: 25 [2020-10-20 00:54:41,115 INFO L226 Difference]: Without dead ends: 18 [2020-10-20 00:54:41,115 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-10-20 00:54:41,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-10-20 00:54:41,120 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-10-20 00:54:41,120 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-10-20 00:54:41,121 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2020-10-20 00:54:41,121 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 13 [2020-10-20 00:54:41,122 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-20 00:54:41,122 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2020-10-20 00:54:41,122 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-20 00:54:41,122 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2020-10-20 00:54:41,123 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-10-20 00:54:41,123 INFO L414 BasicCegarLoop]: Found error trace [2020-10-20 00:54:41,123 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-20 00:54:41,124 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-10-20 00:54:41,124 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-20 00:54:41,124 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 00:54:41,124 INFO L82 PathProgramCache]: Analyzing trace with hash 467501014, now seen corresponding path program 1 times [2020-10-20 00:54:41,125 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-20 00:54:41,125 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1424099615] [2020-10-20 00:54:41,125 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-20 00:54:41,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 00:54:41,518 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-20 00:54:41,518 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1424099615] [2020-10-20 00:54:41,518 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [227811868] [2020-10-20 00:54:41,519 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 [2020-10-20 00:54:41,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 00:54:41,583 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 25 conjunts are in the unsatisfiable core [2020-10-20 00:54:41,591 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-20 00:54:41,664 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2020-10-20 00:54:41,666 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-10-20 00:54:41,675 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-10-20 00:54:41,675 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2020-10-20 00:54:41,676 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:15, output treesize:11 [2020-10-20 00:54:41,808 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2020-10-20 00:54:41,809 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-10-20 00:54:41,819 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-10-20 00:54:41,820 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-10-20 00:54:41,820 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:24 [2020-10-20 00:54:41,877 INFO L350 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2020-10-20 00:54:41,878 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 26 treesize of output 39 [2020-10-20 00:54:41,879 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-10-20 00:54:41,923 INFO L625 ElimStorePlain]: treesize reduction 22, result has 59.3 percent of original size [2020-10-20 00:54:41,924 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-10-20 00:54:41,924 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:36, output treesize:32 [2020-10-20 00:54:42,040 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-20 00:54:42,046 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-20 00:54:42,051 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-20 00:54:42,054 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-20 00:54:42,057 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-20 00:54:42,063 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-20 00:54:42,065 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-20 00:54:42,069 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-20 00:54:42,072 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-20 00:54:42,142 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-20 00:54:42,143 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-10-20 00:54:42,143 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 17 [2020-10-20 00:54:42,143 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [877431150] [2020-10-20 00:54:42,144 INFO L461 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-10-20 00:54:42,145 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-20 00:54:42,145 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-10-20 00:54:42,146 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=218, Unknown=0, NotChecked=0, Total=272 [2020-10-20 00:54:42,146 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 17 states. [2020-10-20 00:54:42,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-20 00:54:42,831 INFO L93 Difference]: Finished difference Result 41 states and 45 transitions. [2020-10-20 00:54:42,832 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-10-20 00:54:42,832 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 15 [2020-10-20 00:54:42,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-20 00:54:42,833 INFO L225 Difference]: With dead ends: 41 [2020-10-20 00:54:42,833 INFO L226 Difference]: Without dead ends: 39 [2020-10-20 00:54:42,834 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 7 SyntacticMatches, 2 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 118 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=205, Invalid=551, Unknown=0, NotChecked=0, Total=756 [2020-10-20 00:54:42,835 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-10-20 00:54:42,840 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 27. [2020-10-20 00:54:42,840 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-10-20 00:54:42,841 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 31 transitions. [2020-10-20 00:54:42,841 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 31 transitions. Word has length 15 [2020-10-20 00:54:42,841 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-20 00:54:42,842 INFO L481 AbstractCegarLoop]: Abstraction has 27 states and 31 transitions. [2020-10-20 00:54:42,842 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-10-20 00:54:42,842 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 31 transitions. [2020-10-20 00:54:42,843 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-10-20 00:54:42,843 INFO L414 BasicCegarLoop]: Found error trace [2020-10-20 00:54:42,843 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-20 00:54:43,056 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-20 00:54:43,057 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-20 00:54:43,058 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 00:54:43,058 INFO L82 PathProgramCache]: Analyzing trace with hash 35676596, now seen corresponding path program 2 times [2020-10-20 00:54:43,058 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-20 00:54:43,059 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [684117992] [2020-10-20 00:54:43,059 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-20 00:54:43,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 00:54:43,118 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-20 00:54:43,119 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [684117992] [2020-10-20 00:54:43,119 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [376218978] [2020-10-20 00:54:43,119 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 [2020-10-20 00:54:43,185 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-10-20 00:54:43,186 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-10-20 00:54:43,187 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 6 conjunts are in the unsatisfiable core [2020-10-20 00:54:43,189 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-20 00:54:43,199 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-20 00:54:43,200 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-10-20 00:54:43,200 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 6 [2020-10-20 00:54:43,201 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [758135914] [2020-10-20 00:54:43,201 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-10-20 00:54:43,201 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-20 00:54:43,202 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-10-20 00:54:43,202 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-10-20 00:54:43,202 INFO L87 Difference]: Start difference. First operand 27 states and 31 transitions. Second operand 6 states. [2020-10-20 00:54:43,339 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-20 00:54:43,339 INFO L93 Difference]: Finished difference Result 45 states and 50 transitions. [2020-10-20 00:54:43,339 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-10-20 00:54:43,340 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 17 [2020-10-20 00:54:43,340 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-20 00:54:43,341 INFO L225 Difference]: With dead ends: 45 [2020-10-20 00:54:43,341 INFO L226 Difference]: Without dead ends: 38 [2020-10-20 00:54:43,343 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2020-10-20 00:54:43,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-10-20 00:54:43,353 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 29. [2020-10-20 00:54:43,353 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-10-20 00:54:43,354 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2020-10-20 00:54:43,354 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 17 [2020-10-20 00:54:43,355 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-20 00:54:43,355 INFO L481 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2020-10-20 00:54:43,355 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-10-20 00:54:43,355 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2020-10-20 00:54:43,355 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-10-20 00:54:43,356 INFO L414 BasicCegarLoop]: Found error trace [2020-10-20 00:54:43,356 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-20 00:54:43,569 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-20 00:54:43,570 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-20 00:54:43,570 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 00:54:43,571 INFO L82 PathProgramCache]: Analyzing trace with hash 1570853842, now seen corresponding path program 3 times [2020-10-20 00:54:43,571 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-20 00:54:43,571 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1158603492] [2020-10-20 00:54:43,571 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-20 00:54:43,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 00:54:43,922 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-20 00:54:43,922 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1158603492] [2020-10-20 00:54:43,922 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [360116238] [2020-10-20 00:54:43,923 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 [2020-10-20 00:54:43,977 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2020-10-20 00:54:43,978 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-10-20 00:54:43,979 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 27 conjunts are in the unsatisfiable core [2020-10-20 00:54:43,981 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-20 00:54:43,988 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2020-10-20 00:54:43,991 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-10-20 00:54:43,995 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-10-20 00:54:43,995 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2020-10-20 00:54:43,996 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:12, output treesize:8 [2020-10-20 00:54:44,174 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 17 treesize of output 17 [2020-10-20 00:54:44,175 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-10-20 00:54:44,182 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-10-20 00:54:44,183 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-10-20 00:54:44,183 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:24 [2020-10-20 00:54:44,263 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-20 00:54:44,267 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-20 00:54:44,270 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-20 00:54:44,273 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-20 00:54:44,278 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-20 00:54:44,281 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-20 00:54:44,285 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-20 00:54:44,288 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-20 00:54:44,347 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-20 00:54:44,347 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-10-20 00:54:44,348 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 22 [2020-10-20 00:54:44,348 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1954110952] [2020-10-20 00:54:44,348 INFO L461 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-10-20 00:54:44,349 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-20 00:54:44,349 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-10-20 00:54:44,349 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2020-10-20 00:54:44,349 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand 22 states. [2020-10-20 00:54:45,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-20 00:54:45,395 INFO L93 Difference]: Finished difference Result 59 states and 65 transitions. [2020-10-20 00:54:45,395 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-10-20 00:54:45,395 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 19 [2020-10-20 00:54:45,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-20 00:54:45,397 INFO L225 Difference]: With dead ends: 59 [2020-10-20 00:54:45,397 INFO L226 Difference]: Without dead ends: 57 [2020-10-20 00:54:45,398 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 210 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=307, Invalid=1099, Unknown=0, NotChecked=0, Total=1406 [2020-10-20 00:54:45,399 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-10-20 00:54:45,404 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 34. [2020-10-20 00:54:45,405 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-10-20 00:54:45,405 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 39 transitions. [2020-10-20 00:54:45,406 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 39 transitions. Word has length 19 [2020-10-20 00:54:45,406 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-20 00:54:45,406 INFO L481 AbstractCegarLoop]: Abstraction has 34 states and 39 transitions. [2020-10-20 00:54:45,406 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-10-20 00:54:45,406 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 39 transitions. [2020-10-20 00:54:45,407 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-10-20 00:54:45,407 INFO L414 BasicCegarLoop]: Found error trace [2020-10-20 00:54:45,407 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-20 00:54:45,620 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-20 00:54:45,621 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-20 00:54:45,622 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 00:54:45,622 INFO L82 PathProgramCache]: Analyzing trace with hash -78888342, now seen corresponding path program 1 times [2020-10-20 00:54:45,622 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-20 00:54:45,623 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [466686258] [2020-10-20 00:54:45,623 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-20 00:54:45,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 00:54:45,714 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-10-20 00:54:45,715 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [466686258] [2020-10-20 00:54:45,715 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [619953064] [2020-10-20 00:54:45,715 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-20 00:54:45,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 00:54:45,764 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 6 conjunts are in the unsatisfiable core [2020-10-20 00:54:45,765 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-20 00:54:45,803 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-10-20 00:54:45,803 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-10-20 00:54:45,803 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-10-20 00:54:45,804 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1883806177] [2020-10-20 00:54:45,804 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-10-20 00:54:45,804 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-20 00:54:45,804 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-10-20 00:54:45,805 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2020-10-20 00:54:45,805 INFO L87 Difference]: Start difference. First operand 34 states and 39 transitions. Second operand 10 states. [2020-10-20 00:54:45,916 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-20 00:54:45,916 INFO L93 Difference]: Finished difference Result 61 states and 67 transitions. [2020-10-20 00:54:45,917 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-10-20 00:54:45,917 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 19 [2020-10-20 00:54:45,917 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-20 00:54:45,918 INFO L225 Difference]: With dead ends: 61 [2020-10-20 00:54:45,918 INFO L226 Difference]: Without dead ends: 45 [2020-10-20 00:54:45,920 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=48, Invalid=108, Unknown=0, NotChecked=0, Total=156 [2020-10-20 00:54:45,920 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-10-20 00:54:45,931 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 33. [2020-10-20 00:54:45,932 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-10-20 00:54:45,932 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 37 transitions. [2020-10-20 00:54:45,932 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 37 transitions. Word has length 19 [2020-10-20 00:54:45,933 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-20 00:54:45,933 INFO L481 AbstractCegarLoop]: Abstraction has 33 states and 37 transitions. [2020-10-20 00:54:45,933 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-10-20 00:54:45,933 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 37 transitions. [2020-10-20 00:54:45,934 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-10-20 00:54:45,934 INFO L414 BasicCegarLoop]: Found error trace [2020-10-20 00:54:45,934 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-20 00:54:46,144 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-20 00:54:46,145 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-20 00:54:46,146 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 00:54:46,147 INFO L82 PathProgramCache]: Analyzing trace with hash -1044113744, now seen corresponding path program 4 times [2020-10-20 00:54:46,147 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-20 00:54:46,147 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1188930575] [2020-10-20 00:54:46,148 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-20 00:54:46,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 00:54:46,204 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 1 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-20 00:54:46,205 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1188930575] [2020-10-20 00:54:46,205 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [991063085] [2020-10-20 00:54:46,205 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-20 00:54:46,247 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-10-20 00:54:46,248 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-10-20 00:54:46,249 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 29 conjunts are in the unsatisfiable core [2020-10-20 00:54:46,251 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-20 00:54:46,266 INFO L350 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2020-10-20 00:54:46,266 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 15 treesize of output 19 [2020-10-20 00:54:46,267 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-10-20 00:54:46,270 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-10-20 00:54:46,271 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2020-10-20 00:54:46,271 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:17, output treesize:8 [2020-10-20 00:54:46,337 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 17 treesize of output 17 [2020-10-20 00:54:46,338 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-10-20 00:54:46,354 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-10-20 00:54:46,354 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-10-20 00:54:46,354 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:33, output treesize:29 [2020-10-20 00:54:46,470 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-20 00:54:46,474 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-20 00:54:46,486 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-20 00:54:46,488 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-20 00:54:46,492 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-20 00:54:46,494 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-20 00:54:46,497 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-20 00:54:46,499 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-20 00:54:46,548 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-10-20 00:54:46,549 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-10-20 00:54:46,549 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 11] total 16 [2020-10-20 00:54:46,549 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1609232765] [2020-10-20 00:54:46,550 INFO L461 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-10-20 00:54:46,550 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-20 00:54:46,550 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-10-20 00:54:46,550 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=196, Unknown=0, NotChecked=0, Total=240 [2020-10-20 00:54:46,551 INFO L87 Difference]: Start difference. First operand 33 states and 37 transitions. Second operand 16 states. [2020-10-20 00:54:47,451 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-20 00:54:47,451 INFO L93 Difference]: Finished difference Result 79 states and 85 transitions. [2020-10-20 00:54:47,451 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-10-20 00:54:47,452 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 21 [2020-10-20 00:54:47,452 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-20 00:54:47,452 INFO L225 Difference]: With dead ends: 79 [2020-10-20 00:54:47,453 INFO L226 Difference]: Without dead ends: 69 [2020-10-20 00:54:47,456 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 292 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=283, Invalid=1199, Unknown=0, NotChecked=0, Total=1482 [2020-10-20 00:54:47,456 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2020-10-20 00:54:47,468 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 44. [2020-10-20 00:54:47,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-10-20 00:54:47,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 49 transitions. [2020-10-20 00:54:47,472 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 49 transitions. Word has length 21 [2020-10-20 00:54:47,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-20 00:54:47,472 INFO L481 AbstractCegarLoop]: Abstraction has 44 states and 49 transitions. [2020-10-20 00:54:47,473 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-10-20 00:54:47,473 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 49 transitions. [2020-10-20 00:54:47,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-10-20 00:54:47,474 INFO L414 BasicCegarLoop]: Found error trace [2020-10-20 00:54:47,474 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-20 00:54:47,690 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-20 00:54:47,691 INFO L429 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-20 00:54:47,692 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 00:54:47,692 INFO L82 PathProgramCache]: Analyzing trace with hash -1020544562, now seen corresponding path program 5 times [2020-10-20 00:54:47,692 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-20 00:54:47,693 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [410171210] [2020-10-20 00:54:47,693 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-20 00:54:47,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 00:54:48,053 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-20 00:54:48,053 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [410171210] [2020-10-20 00:54:48,054 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [594723290] [2020-10-20 00:54:48,054 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-20 00:54:48,100 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2020-10-20 00:54:48,100 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-10-20 00:54:48,101 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 38 conjunts are in the unsatisfiable core [2020-10-20 00:54:48,103 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-20 00:54:48,108 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2020-10-20 00:54:48,109 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-10-20 00:54:48,114 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-10-20 00:54:48,114 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2020-10-20 00:54:48,115 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:18, output treesize:14 [2020-10-20 00:54:48,121 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2020-10-20 00:54:48,121 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-10-20 00:54:48,135 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-10-20 00:54:48,136 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-10-20 00:54:48,136 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:27, output treesize:14 [2020-10-20 00:54:48,147 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2020-10-20 00:54:48,147 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-10-20 00:54:48,157 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-10-20 00:54:48,159 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-10-20 00:54:48,160 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:30, output treesize:17 [2020-10-20 00:54:48,177 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2020-10-20 00:54:48,178 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-10-20 00:54:48,189 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-10-20 00:54:48,190 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-10-20 00:54:48,190 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:33, output treesize:20 [2020-10-20 00:54:48,241 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2020-10-20 00:54:48,241 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-10-20 00:54:48,252 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-10-20 00:54:48,252 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-10-20 00:54:48,253 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:34, output treesize:30 [2020-10-20 00:54:48,298 INFO L190 IndexEqualityManager]: detected not equals via solver [2020-10-20 00:54:48,299 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 31 [2020-10-20 00:54:48,300 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-10-20 00:54:48,314 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-10-20 00:54:48,314 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-10-20 00:54:48,315 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:50, output treesize:46 [2020-10-20 00:54:48,365 INFO L190 IndexEqualityManager]: detected not equals via solver [2020-10-20 00:54:48,366 INFO L190 IndexEqualityManager]: detected not equals via solver [2020-10-20 00:54:48,368 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 40 [2020-10-20 00:54:48,369 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-10-20 00:54:48,387 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-10-20 00:54:48,387 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-10-20 00:54:48,388 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:58, output treesize:54 [2020-10-20 00:54:48,440 INFO L190 IndexEqualityManager]: detected not equals via solver [2020-10-20 00:54:48,441 INFO L190 IndexEqualityManager]: detected not equals via solver [2020-10-20 00:54:48,441 INFO L190 IndexEqualityManager]: detected not equals via solver [2020-10-20 00:54:48,442 INFO L190 IndexEqualityManager]: detected not equals via solver [2020-10-20 00:54:48,444 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 52 treesize of output 52 [2020-10-20 00:54:48,445 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-10-20 00:54:48,464 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-10-20 00:54:48,465 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-10-20 00:54:48,465 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:68, output treesize:64 [2020-10-20 00:54:48,582 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-20 00:54:48,584 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 4 disjuncts [2020-10-20 00:54:48,587 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 4 disjuncts [2020-10-20 00:54:48,589 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 4 disjuncts [2020-10-20 00:54:48,656 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-20 00:54:48,656 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-10-20 00:54:48,657 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 21 [2020-10-20 00:54:48,657 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1715011659] [2020-10-20 00:54:48,657 INFO L461 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-10-20 00:54:48,657 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-20 00:54:48,658 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-10-20 00:54:48,658 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2020-10-20 00:54:48,658 INFO L87 Difference]: Start difference. First operand 44 states and 49 transitions. Second operand 21 states. [2020-10-20 00:54:50,222 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-20 00:54:50,222 INFO L93 Difference]: Finished difference Result 82 states and 89 transitions. [2020-10-20 00:54:50,223 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-10-20 00:54:50,223 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 23 [2020-10-20 00:54:50,223 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-20 00:54:50,224 INFO L225 Difference]: With dead ends: 82 [2020-10-20 00:54:50,224 INFO L226 Difference]: Without dead ends: 80 [2020-10-20 00:54:50,226 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 302 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=310, Invalid=1330, Unknown=0, NotChecked=0, Total=1640 [2020-10-20 00:54:50,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-10-20 00:54:50,235 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 52. [2020-10-20 00:54:50,235 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-10-20 00:54:50,236 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 58 transitions. [2020-10-20 00:54:50,236 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 58 transitions. Word has length 23 [2020-10-20 00:54:50,236 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-20 00:54:50,236 INFO L481 AbstractCegarLoop]: Abstraction has 52 states and 58 transitions. [2020-10-20 00:54:50,237 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-10-20 00:54:50,237 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 58 transitions. [2020-10-20 00:54:50,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-10-20 00:54:50,238 INFO L414 BasicCegarLoop]: Found error trace [2020-10-20 00:54:50,238 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-20 00:54:50,451 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-20 00:54:50,452 INFO L429 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-20 00:54:50,452 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 00:54:50,452 INFO L82 PathProgramCache]: Analyzing trace with hash 1322104934, now seen corresponding path program 2 times [2020-10-20 00:54:50,453 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-20 00:54:50,453 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1023578399] [2020-10-20 00:54:50,453 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-20 00:54:50,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-20 00:54:50,481 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-20 00:54:50,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-20 00:54:50,515 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-20 00:54:50,559 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-20 00:54:50,562 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-10-20 00:54:50,562 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-10-20 00:54:50,628 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.10 12:54:50 BoogieIcfgContainer [2020-10-20 00:54:50,629 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-10-20 00:54:50,629 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-10-20 00:54:50,629 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-10-20 00:54:50,629 INFO L275 PluginConnector]: Witness Printer initialized [2020-10-20 00:54:50,630 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.10 12:54:40" (3/4) ... [2020-10-20 00:54:50,632 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2020-10-20 00:54:50,697 INFO L141 WitnessManager]: Wrote witness to /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/witness.graphml [2020-10-20 00:54:50,697 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-10-20 00:54:50,699 INFO L168 Benchmark]: Toolchain (without parser) took 11017.21 ms. Allocated memory was 35.1 MB in the beginning and 86.5 MB in the end (delta: 51.4 MB). Free memory was 12.9 MB in the beginning and 61.2 MB in the end (delta: -48.2 MB). Peak memory consumption was 3.1 MB. Max. memory is 14.3 GB. [2020-10-20 00:54:50,700 INFO L168 Benchmark]: CDTParser took 0.73 ms. Allocated memory is still 33.6 MB. Free memory was 19.1 MB in the beginning and 19.1 MB in the end (delta: 36.0 kB). Peak memory consumption was 36.0 kB. Max. memory is 14.3 GB. [2020-10-20 00:54:50,701 INFO L168 Benchmark]: CACSL2BoogieTranslator took 338.08 ms. Allocated memory was 35.1 MB in the beginning and 44.0 MB in the end (delta: 8.9 MB). Free memory was 12.1 MB in the beginning and 23.1 MB in the end (delta: -11.0 MB). Peak memory consumption was 9.8 MB. Max. memory is 14.3 GB. [2020-10-20 00:54:50,701 INFO L168 Benchmark]: Boogie Procedure Inliner took 39.07 ms. Allocated memory is still 44.0 MB. Free memory was 23.1 MB in the beginning and 21.2 MB in the end (delta: 1.9 MB). Peak memory consumption was 1.9 MB. Max. memory is 14.3 GB. [2020-10-20 00:54:50,702 INFO L168 Benchmark]: Boogie Preprocessor took 25.50 ms. Allocated memory is still 44.0 MB. Free memory was 21.2 MB in the beginning and 19.9 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 14.3 GB. [2020-10-20 00:54:50,703 INFO L168 Benchmark]: RCFGBuilder took 314.14 ms. Allocated memory was 44.0 MB in the beginning and 46.1 MB in the end (delta: 2.1 MB). Free memory was 19.7 MB in the beginning and 16.4 MB in the end (delta: 3.3 MB). Peak memory consumption was 8.1 MB. Max. memory is 14.3 GB. [2020-10-20 00:54:50,703 INFO L168 Benchmark]: TraceAbstraction took 10220.62 ms. Allocated memory was 46.1 MB in the beginning and 86.5 MB in the end (delta: 40.4 MB). Free memory was 15.9 MB in the beginning and 63.6 MB in the end (delta: -47.6 MB). Peak memory consumption was 47.9 MB. Max. memory is 14.3 GB. [2020-10-20 00:54:50,704 INFO L168 Benchmark]: Witness Printer took 68.52 ms. Allocated memory is still 86.5 MB. Free memory was 63.6 MB in the beginning and 61.2 MB in the end (delta: 2.4 MB). Peak memory consumption was 2.4 MB. Max. memory is 14.3 GB. [2020-10-20 00:54:50,708 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.73 ms. Allocated memory is still 33.6 MB. Free memory was 19.1 MB in the beginning and 19.1 MB in the end (delta: 36.0 kB). Peak memory consumption was 36.0 kB. Max. memory is 14.3 GB. * CACSL2BoogieTranslator took 338.08 ms. Allocated memory was 35.1 MB in the beginning and 44.0 MB in the end (delta: 8.9 MB). Free memory was 12.1 MB in the beginning and 23.1 MB in the end (delta: -11.0 MB). Peak memory consumption was 9.8 MB. Max. memory is 14.3 GB. * Boogie Procedure Inliner took 39.07 ms. Allocated memory is still 44.0 MB. Free memory was 23.1 MB in the beginning and 21.2 MB in the end (delta: 1.9 MB). Peak memory consumption was 1.9 MB. Max. memory is 14.3 GB. * Boogie Preprocessor took 25.50 ms. Allocated memory is still 44.0 MB. Free memory was 21.2 MB in the beginning and 19.9 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 14.3 GB. * RCFGBuilder took 314.14 ms. Allocated memory was 44.0 MB in the beginning and 46.1 MB in the end (delta: 2.1 MB). Free memory was 19.7 MB in the beginning and 16.4 MB in the end (delta: 3.3 MB). Peak memory consumption was 8.1 MB. Max. memory is 14.3 GB. * TraceAbstraction took 10220.62 ms. Allocated memory was 46.1 MB in the beginning and 86.5 MB in the end (delta: 40.4 MB). Free memory was 15.9 MB in the beginning and 63.6 MB in the end (delta: -47.6 MB). Peak memory consumption was 47.9 MB. Max. memory is 14.3 GB. * Witness Printer took 68.52 ms. Allocated memory is still 86.5 MB. Free memory was 63.6 MB in the beginning and 61.2 MB in the end (delta: 2.4 MB). Peak memory consumption was 2.4 MB. Max. memory is 14.3 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 3]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L16] int MAX = __VERIFIER_nondet_uint(); [L17] COND FALSE !(!(MAX > 0)) [L18] char str1[MAX], str2[MAX]; [L19] int cont, i, j; [L20] cont = 0 [L22] i=0 [L22] COND TRUE i= 0 [L30] EXPR str1[0] [L30] str2[j] = str1[0] [L31] j++ [L29] i-- [L29] COND TRUE i >= 0 [L30] EXPR str1[0] [L30] str2[j] = str1[0] [L31] j++ [L29] i-- [L29] COND FALSE !(i >= 0) [L34] j = MAX-1 [L35] i=0 [L35] COND TRUE i