/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/string-2.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 16:43:57,228 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 16:43:57,231 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 16:43:57,244 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 16:43:57,245 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 16:43:57,246 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 16:43:57,247 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 16:43:57,249 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 16:43:57,251 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 16:43:57,252 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 16:43:57,253 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 16:43:57,254 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 16:43:57,255 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 16:43:57,256 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 16:43:57,257 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 16:43:57,258 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 16:43:57,258 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 16:43:57,259 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 16:43:57,261 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 16:43:57,263 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 16:43:57,265 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 16:43:57,266 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 16:43:57,267 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 16:43:57,268 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 16:43:57,270 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-07-21 16:43:57,271 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-07-21 16:43:57,271 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-07-21 16:43:57,272 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-07-21 16:43:57,273 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-07-21 16:43:57,273 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-07-21 16:43:57,274 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-07-21 16:43:57,275 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-07-21 16:43:57,275 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-07-21 16:43:57,276 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-07-21 16:43:57,277 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-07-21 16:43:57,277 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-07-21 16:43:57,278 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-07-21 16:43:57,278 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-07-21 16:43:57,278 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 16:43:57,279 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 16:43:57,280 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 16:43:57,281 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 16:43:57,311 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 16:43:57,311 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 16:43:57,315 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 16:43:57,315 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 16:43:57,315 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 16:43:57,316 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 16:43:57,316 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 16:43:57,316 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 16:43:57,316 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 16:43:57,316 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 16:43:57,318 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 16:43:57,318 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 16:43:57,318 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 16:43:57,319 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 16:43:57,319 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 16:43:57,319 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 16:43:57,319 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 16:43:57,320 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 16:43:57,320 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 16:43:57,320 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 16:43:57,321 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 16:43:57,321 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 16:43:57,321 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 16:43:57,322 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 16:43:57,322 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 16:43:57,322 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 16:43:57,323 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:43:57,323 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 16:43:57,323 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 16:43:57,323 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_VARIABLES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 2 [2020-07-21 16:43:57,694 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 16:43:57,709 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 16:43:57,714 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 16:43:57,715 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 16:43:57,716 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 16:43:57,719 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/string-2.i [2020-07-21 16:43:57,814 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/354771553/a5e981ab55064ee38fe56290780e72fa/FLAG2a3625545 [2020-07-21 16:43:58,368 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 16:43:58,369 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/string-2.i [2020-07-21 16:43:58,377 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/354771553/a5e981ab55064ee38fe56290780e72fa/FLAG2a3625545 [2020-07-21 16:43:58,676 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/354771553/a5e981ab55064ee38fe56290780e72fa [2020-07-21 16:43:58,686 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 16:43:58,689 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 16:43:58,693 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 16:43:58,693 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 16:43:58,697 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 16:43:58,698 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 04:43:58" (1/1) ... [2020-07-21 16:43:58,701 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@376da73e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:43:58, skipping insertion in model container [2020-07-21 16:43:58,701 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 04:43:58" (1/1) ... [2020-07-21 16:43:58,710 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 16:43:58,738 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 16:43:59,004 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 16:43:59,009 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 16:43:59,035 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 16:43:59,059 INFO L208 MainTranslator]: Completed translation [2020-07-21 16:43:59,060 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:43:59 WrapperNode [2020-07-21 16:43:59,060 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 16:43:59,061 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 16:43:59,061 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 16:43:59,062 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 16:43:59,184 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:43:59" (1/1) ... [2020-07-21 16:43:59,186 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:43:59" (1/1) ... [2020-07-21 16:43:59,198 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:43:59" (1/1) ... [2020-07-21 16:43:59,199 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:43:59" (1/1) ... [2020-07-21 16:43:59,214 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:43:59" (1/1) ... [2020-07-21 16:43:59,223 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:43:59" (1/1) ... [2020-07-21 16:43:59,225 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:43:59" (1/1) ... [2020-07-21 16:43:59,229 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 16:43:59,230 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 16:43:59,230 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 16:43:59,230 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 16:43:59,232 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:43:59" (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 [2020-07-21 16:43:59,325 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 16:43:59,326 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 16:43:59,326 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-21 16:43:59,326 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-21 16:43:59,326 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 16:43:59,326 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 16:43:59,327 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-21 16:43:59,327 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-21 16:43:59,327 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 16:43:59,327 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-07-21 16:43:59,327 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 16:43:59,328 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-07-21 16:43:59,328 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-07-21 16:43:59,328 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-07-21 16:43:59,328 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-07-21 16:43:59,329 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 16:43:59,329 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 16:43:59,742 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 16:43:59,742 INFO L295 CfgBuilder]: Removed 5 assume(true) statements. [2020-07-21 16:43:59,747 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 04:43:59 BoogieIcfgContainer [2020-07-21 16:43:59,747 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 16:43:59,749 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 16:43:59,749 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 16:43:59,753 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 16:43:59,753 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 04:43:58" (1/3) ... [2020-07-21 16:43:59,754 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@394c94ec and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 04:43:59, skipping insertion in model container [2020-07-21 16:43:59,754 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:43:59" (2/3) ... [2020-07-21 16:43:59,755 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@394c94ec and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 04:43:59, skipping insertion in model container [2020-07-21 16:43:59,755 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 04:43:59" (3/3) ... [2020-07-21 16:43:59,757 INFO L109 eAbstractionObserver]: Analyzing ICFG string-2.i [2020-07-21 16:43:59,769 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 16:43:59,780 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 16:43:59,795 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 16:43:59,825 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 16:43:59,825 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 16:43:59,825 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 16:43:59,826 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 16:43:59,826 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 16:43:59,826 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 16:43:59,826 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 16:43:59,827 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 16:43:59,845 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states. [2020-07-21 16:43:59,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-21 16:43:59,851 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:43:59,852 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:43:59,853 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:43:59,858 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:43:59,858 INFO L82 PathProgramCache]: Analyzing trace with hash -522531256, now seen corresponding path program 1 times [2020-07-21 16:43:59,866 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:43:59,867 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1784044295] [2020-07-21 16:43:59,868 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:43:59,977 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:43:59,978 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:43:59,983 INFO L263 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 1 conjunts are in the unsatisfiable core [2020-07-21 16:43:59,991 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:44:00,018 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:44:00,018 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:44:00,020 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1784044295] [2020-07-21 16:44:00,020 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:44:00,021 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-07-21 16:44:00,022 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1004615060] [2020-07-21 16:44:00,028 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-07-21 16:44:00,028 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:44:00,044 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-07-21 16:44:00,045 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-21 16:44:00,047 INFO L87 Difference]: Start difference. First operand 35 states. Second operand 2 states. [2020-07-21 16:44:00,078 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:44:00,078 INFO L93 Difference]: Finished difference Result 62 states and 89 transitions. [2020-07-21 16:44:00,079 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-07-21 16:44:00,080 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 22 [2020-07-21 16:44:00,080 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:44:00,087 INFO L225 Difference]: With dead ends: 62 [2020-07-21 16:44:00,087 INFO L226 Difference]: Without dead ends: 28 [2020-07-21 16:44:00,091 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-21 16:44:00,108 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-21 16:44:00,127 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-07-21 16:44:00,129 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-07-21 16:44:00,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 33 transitions. [2020-07-21 16:44:00,133 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 33 transitions. Word has length 22 [2020-07-21 16:44:00,133 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:44:00,134 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 33 transitions. [2020-07-21 16:44:00,134 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-07-21 16:44:00,134 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 33 transitions. [2020-07-21 16:44:00,135 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-21 16:44:00,135 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:44:00,136 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:44:00,344 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:44:00,345 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:44:00,345 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:44:00,346 INFO L82 PathProgramCache]: Analyzing trace with hash 1282672092, now seen corresponding path program 1 times [2020-07-21 16:44:00,346 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:44:00,347 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [303921627] [2020-07-21 16:44:00,348 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:44:00,445 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:44:00,445 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:44:00,447 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 16:44:00,453 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:44:00,518 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:44:00,518 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:44:00,519 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [303921627] [2020-07-21 16:44:00,519 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:44:00,520 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:44:00,520 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [608529524] [2020-07-21 16:44:00,524 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:44:00,525 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:44:00,525 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:44:00,526 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:44:00,527 INFO L87 Difference]: Start difference. First operand 28 states and 33 transitions. Second operand 3 states. [2020-07-21 16:44:00,614 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:44:00,614 INFO L93 Difference]: Finished difference Result 56 states and 69 transitions. [2020-07-21 16:44:00,615 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:44:00,615 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2020-07-21 16:44:00,615 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:44:00,619 INFO L225 Difference]: With dead ends: 56 [2020-07-21 16:44:00,619 INFO L226 Difference]: Without dead ends: 36 [2020-07-21 16:44:00,620 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:44:00,621 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-07-21 16:44:00,628 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 30. [2020-07-21 16:44:00,629 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 16:44:00,630 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 35 transitions. [2020-07-21 16:44:00,630 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 35 transitions. Word has length 24 [2020-07-21 16:44:00,631 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:44:00,631 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 35 transitions. [2020-07-21 16:44:00,631 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:44:00,631 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 35 transitions. [2020-07-21 16:44:00,632 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-07-21 16:44:00,632 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:44:00,632 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:44:00,848 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:44:00,849 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:44:00,849 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:44:00,850 INFO L82 PathProgramCache]: Analyzing trace with hash -1816798436, now seen corresponding path program 1 times [2020-07-21 16:44:00,851 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:44:00,851 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1144332152] [2020-07-21 16:44:00,852 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:44:00,918 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:44:00,919 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:44:00,920 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:44:00,923 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:44:00,953 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 16:44:00,953 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:44:01,003 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 16:44:01,004 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1144332152] [2020-07-21 16:44:01,005 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:44:01,005 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6 [2020-07-21 16:44:01,005 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1055947908] [2020-07-21 16:44:01,006 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-21 16:44:01,006 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:44:01,007 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-21 16:44:01,007 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-07-21 16:44:01,008 INFO L87 Difference]: Start difference. First operand 30 states and 35 transitions. Second operand 6 states. [2020-07-21 16:44:01,146 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:44:01,147 INFO L93 Difference]: Finished difference Result 79 states and 102 transitions. [2020-07-21 16:44:01,147 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 16:44:01,148 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 28 [2020-07-21 16:44:01,148 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:44:01,149 INFO L225 Difference]: With dead ends: 79 [2020-07-21 16:44:01,150 INFO L226 Difference]: Without dead ends: 58 [2020-07-21 16:44:01,150 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-07-21 16:44:01,151 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-07-21 16:44:01,158 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 42. [2020-07-21 16:44:01,158 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-07-21 16:44:01,159 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 47 transitions. [2020-07-21 16:44:01,160 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 47 transitions. Word has length 28 [2020-07-21 16:44:01,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:44:01,160 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 47 transitions. [2020-07-21 16:44:01,161 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-21 16:44:01,161 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 47 transitions. [2020-07-21 16:44:01,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-07-21 16:44:01,162 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:44:01,163 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:44:01,376 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:44:01,377 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:44:01,378 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:44:01,378 INFO L82 PathProgramCache]: Analyzing trace with hash -1106103076, now seen corresponding path program 2 times [2020-07-21 16:44:01,379 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:44:01,380 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1605371115] [2020-07-21 16:44:01,380 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:44:01,507 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:44:01,508 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:44:01,509 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 16:44:01,515 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:44:01,595 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-21 16:44:01,595 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:44:01,676 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-21 16:44:01,676 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1605371115] [2020-07-21 16:44:01,677 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:44:01,677 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 7 [2020-07-21 16:44:01,678 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [143261580] [2020-07-21 16:44:01,679 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-07-21 16:44:01,679 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:44:01,680 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-07-21 16:44:01,681 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2020-07-21 16:44:01,682 INFO L87 Difference]: Start difference. First operand 42 states and 47 transitions. Second operand 7 states. [2020-07-21 16:44:01,802 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:44:01,803 INFO L93 Difference]: Finished difference Result 93 states and 114 transitions. [2020-07-21 16:44:01,803 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 16:44:01,804 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 40 [2020-07-21 16:44:01,804 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:44:01,805 INFO L225 Difference]: With dead ends: 93 [2020-07-21 16:44:01,805 INFO L226 Difference]: Without dead ends: 66 [2020-07-21 16:44:01,806 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 69 SyntacticMatches, 5 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2020-07-21 16:44:01,807 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-07-21 16:44:01,813 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 46. [2020-07-21 16:44:01,814 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-21 16:44:01,815 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 51 transitions. [2020-07-21 16:44:01,815 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 51 transitions. Word has length 40 [2020-07-21 16:44:01,816 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:44:01,816 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 51 transitions. [2020-07-21 16:44:01,816 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-07-21 16:44:01,816 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 51 transitions. [2020-07-21 16:44:01,817 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-07-21 16:44:01,818 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:44:01,818 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:44:02,031 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:44:02,032 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:44:02,033 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:44:02,033 INFO L82 PathProgramCache]: Analyzing trace with hash 1061537308, now seen corresponding path program 3 times [2020-07-21 16:44:02,034 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:44:02,034 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1512102826] [2020-07-21 16:44:02,035 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:44:02,236 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:44:02,236 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2020-07-21 16:44:02,237 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 16:44:02,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-21 16:44:02,300 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 16:44:02,341 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-21 16:44:02,342 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-21 16:44:02,557 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:44:02,613 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 04:44:02 BoogieIcfgContainer [2020-07-21 16:44:02,614 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 16:44:02,617 INFO L168 Benchmark]: Toolchain (without parser) took 3928.12 ms. Allocated memory was 141.0 MB in the beginning and 223.9 MB in the end (delta: 82.8 MB). Free memory was 99.0 MB in the beginning and 140.6 MB in the end (delta: -41.6 MB). Peak memory consumption was 41.3 MB. Max. memory is 7.1 GB. [2020-07-21 16:44:02,619 INFO L168 Benchmark]: CDTParser took 0.33 ms. Allocated memory is still 141.0 MB. Free memory was 117.2 MB in the beginning and 117.0 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. [2020-07-21 16:44:02,620 INFO L168 Benchmark]: CACSL2BoogieTranslator took 368.10 ms. Allocated memory is still 141.0 MB. Free memory was 98.6 MB in the beginning and 87.9 MB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. [2020-07-21 16:44:02,621 INFO L168 Benchmark]: Boogie Preprocessor took 167.80 ms. Allocated memory was 141.0 MB in the beginning and 199.2 MB in the end (delta: 58.2 MB). Free memory was 87.9 MB in the beginning and 176.2 MB in the end (delta: -88.3 MB). Peak memory consumption was 10.1 MB. Max. memory is 7.1 GB. [2020-07-21 16:44:02,622 INFO L168 Benchmark]: RCFGBuilder took 517.93 ms. Allocated memory is still 199.2 MB. Free memory was 176.2 MB in the beginning and 156.4 MB in the end (delta: 19.8 MB). Peak memory consumption was 19.8 MB. Max. memory is 7.1 GB. [2020-07-21 16:44:02,623 INFO L168 Benchmark]: TraceAbstraction took 2865.11 ms. Allocated memory was 199.2 MB in the beginning and 223.9 MB in the end (delta: 24.6 MB). Free memory was 156.4 MB in the beginning and 140.6 MB in the end (delta: 15.8 MB). Peak memory consumption was 40.5 MB. Max. memory is 7.1 GB. [2020-07-21 16:44:02,628 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.33 ms. Allocated memory is still 141.0 MB. Free memory was 117.2 MB in the beginning and 117.0 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 368.10 ms. Allocated memory is still 141.0 MB. Free memory was 98.6 MB in the beginning and 87.9 MB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 167.80 ms. Allocated memory was 141.0 MB in the beginning and 199.2 MB in the end (delta: 58.2 MB). Free memory was 87.9 MB in the beginning and 176.2 MB in the end (delta: -88.3 MB). Peak memory consumption was 10.1 MB. Max. memory is 7.1 GB. * RCFGBuilder took 517.93 ms. Allocated memory is still 199.2 MB. Free memory was 176.2 MB in the beginning and 156.4 MB in the end (delta: 19.8 MB). Peak memory consumption was 19.8 MB. Max. memory is 7.1 GB. * TraceAbstraction took 2865.11 ms. Allocated memory was 199.2 MB in the beginning and 223.9 MB in the end (delta: 24.6 MB). Free memory was 156.4 MB in the beginning and 140.6 MB in the end (delta: 15.8 MB). Peak memory consumption was 40.5 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - UnprovableResult [Line: 9]: Unable to prove that call of __VERIFIER_error() unreachable Unable to prove that call of __VERIFIER_error() unreachable Reason: overapproximation of shiftLeft at line 58. Possible FailurePath: [L20] char string_A[5], string_B[5]; [L21] int i, j, nc_A, nc_B, found=0; [L24] i=0 VAL [found=0, i=0, string_A={3:0}, string_B={2:0}] [L24] COND TRUE i<5 [L25] string_A[i]=__VERIFIER_nondet_char() [L24] i++ VAL [found=0, i=1, string_A={3:0}, string_B={2:0}] [L24] COND TRUE i<5 [L25] string_A[i]=__VERIFIER_nondet_char() [L24] i++ VAL [found=0, i=2, string_A={3:0}, string_B={2:0}] [L24] COND TRUE i<5 [L25] string_A[i]=__VERIFIER_nondet_char() [L24] i++ VAL [found=0, i=3, string_A={3:0}, string_B={2:0}] [L24] COND TRUE i<5 [L25] string_A[i]=__VERIFIER_nondet_char() [L24] i++ VAL [found=0, i=4, string_A={3:0}, string_B={2:0}] [L24] COND TRUE i<5 [L25] string_A[i]=__VERIFIER_nondet_char() [L24] i++ VAL [found=0, i=5, string_A={3:0}, string_B={2:0}] [L24] COND FALSE !(i<5) VAL [found=0, i=5, string_A={3:0}, string_B={2:0}] [L26] EXPR string_A[5 -1] VAL [found=0, i=5, string_A={3:0}, string_A[5 -1]=0, string_B={2:0}] [L26] COND FALSE !(!(string_A[5 -1]=='\0')) [L28] i=0 VAL [found=0, i=0, string_A={3:0}, string_B={2:0}] [L28] COND TRUE i<5 [L29] string_B[i]=__VERIFIER_nondet_char() [L28] i++ VAL [found=0, i=1, string_A={3:0}, string_B={2:0}] [L28] COND TRUE i<5 [L29] string_B[i]=__VERIFIER_nondet_char() [L28] i++ VAL [found=0, i=2, string_A={3:0}, string_B={2:0}] [L28] COND TRUE i<5 [L29] string_B[i]=__VERIFIER_nondet_char() [L28] i++ VAL [found=0, i=3, string_A={3:0}, string_B={2:0}] [L28] COND TRUE i<5 [L29] string_B[i]=__VERIFIER_nondet_char() [L28] i++ VAL [found=0, i=4, string_A={3:0}, string_B={2:0}] [L28] COND TRUE i<5 [L29] string_B[i]=__VERIFIER_nondet_char() [L28] i++ VAL [found=0, i=5, string_A={3:0}, string_B={2:0}] [L28] COND FALSE !(i<5) VAL [found=0, i=5, string_A={3:0}, string_B={2:0}] [L30] EXPR string_B[5 -1] VAL [found=0, i=5, string_A={3:0}, string_B={2:0}, string_B[5 -1]=0] [L30] COND FALSE !(!(string_B[5 -1]=='\0')) [L32] nc_A = 0 VAL [found=0, i=5, nc_A=0, string_A={3:0}, string_B={2:0}] [L33] EXPR string_A[nc_A] VAL [found=0, i=5, nc_A=0, string_A={3:0}, string_A[nc_A]=0, string_B={2:0}] [L33] COND FALSE !(string_A[nc_A]!='\0') [L36] nc_B = 0 VAL [found=0, i=5, nc_A=0, nc_B=0, string_A={3:0}, string_B={2:0}] [L37] EXPR string_B[nc_B] VAL [found=0, i=5, nc_A=0, nc_B=0, string_A={3:0}, string_B={2:0}, string_B[nc_B]=0] [L37] COND FALSE !(string_B[nc_B]!='\0') [L40] COND FALSE !(!(nc_B >= nc_A)) [L43] EXPR j=0 [L43] i=j=0 VAL [found=0, i=0, j=0, nc_A=0, nc_B=0, string_A={3:0}, string_B={2:0}] [L44] COND FALSE !((inc_B-1)<