/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_FUNCTIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-industry-pattern/ofuf_2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 14:45:14,252 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 14:45:14,255 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 14:45:14,277 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 14:45:14,277 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 14:45:14,279 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 14:45:14,282 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 14:45:14,292 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 14:45:14,298 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 14:45:14,301 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 14:45:14,303 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 14:45:14,304 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 14:45:14,305 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 14:45:14,307 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 14:45:14,310 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 14:45:14,311 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 14:45:14,312 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 14:45:14,313 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 14:45:14,316 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 14:45:14,322 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 14:45:14,326 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 14:45:14,330 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 14:45:14,331 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 14:45:14,332 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 14:45:14,336 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-07-20 14:45:14,337 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-07-20 14:45:14,337 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-07-20 14:45:14,341 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-07-20 14:45:14,341 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-07-20 14:45:14,344 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-07-20 14:45:14,344 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-07-20 14:45:14,346 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-07-20 14:45:14,347 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-07-20 14:45:14,348 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-07-20 14:45:14,352 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-07-20 14:45:14,352 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-07-20 14:45:14,353 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-07-20 14:45:14,353 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-07-20 14:45:14,354 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 14:45:14,355 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 14:45:14,356 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 14:45:14,357 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 [2020-07-20 14:45:14,377 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 14:45:14,377 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 14:45:14,379 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 14:45:14,379 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 14:45:14,379 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 14:45:14,379 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 14:45:14,379 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 14:45:14,380 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 14:45:14,380 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 14:45:14,380 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 14:45:14,380 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 14:45:14,380 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 14:45:14,380 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 14:45:14,381 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 14:45:14,381 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 14:45:14,381 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 14:45:14,381 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 14:45:14,381 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 14:45:14,382 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 14:45:14,382 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 14:45:14,382 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 14:45:14,382 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 14:45:14,382 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 14:45:14,383 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 14:45:14,383 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 14:45:14,383 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 14:45:14,383 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:45:14,383 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 14:45:14,383 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 14:45:14,384 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_FUNCTIONS 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 -> 4 [2020-07-20 14:45:14,685 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 14:45:14,697 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 14:45:14,700 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 14:45:14,701 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 14:45:14,702 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 14:45:14,702 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-industry-pattern/ofuf_2.c [2020-07-20 14:45:14,772 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fd099d086/dfd31ed543694d578841c28a718f2359/FLAG5347d2419 [2020-07-20 14:45:15,390 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 14:45:15,390 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-industry-pattern/ofuf_2.c [2020-07-20 14:45:15,401 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fd099d086/dfd31ed543694d578841c28a718f2359/FLAG5347d2419 [2020-07-20 14:45:15,676 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fd099d086/dfd31ed543694d578841c28a718f2359 [2020-07-20 14:45:15,685 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 14:45:15,687 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 14:45:15,689 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 14:45:15,689 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 14:45:15,693 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 14:45:15,695 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 02:45:15" (1/1) ... [2020-07-20 14:45:15,698 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@11ea9421 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:45:15, skipping insertion in model container [2020-07-20 14:45:15,698 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 02:45:15" (1/1) ... [2020-07-20 14:45:15,708 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 14:45:15,766 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 14:45:16,214 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 14:45:16,227 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 14:45:16,298 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 14:45:16,323 INFO L208 MainTranslator]: Completed translation [2020-07-20 14:45:16,324 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:45:16 WrapperNode [2020-07-20 14:45:16,324 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 14:45:16,325 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 14:45:16,325 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 14:45:16,325 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 14:45:16,337 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:45:16" (1/1) ... [2020-07-20 14:45:16,337 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:45:16" (1/1) ... [2020-07-20 14:45:16,359 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:45:16" (1/1) ... [2020-07-20 14:45:16,359 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:45:16" (1/1) ... [2020-07-20 14:45:16,392 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:45:16" (1/1) ... [2020-07-20 14:45:16,404 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:45:16" (1/1) ... [2020-07-20 14:45:16,409 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:45:16" (1/1) ... [2020-07-20 14:45:16,417 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 14:45:16,417 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 14:45:16,417 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 14:45:16,418 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 14:45:16,419 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:45:16" (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 [2020-07-20 14:45:16,508 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 14:45:16,508 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 14:45:16,509 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-20 14:45:16,509 INFO L138 BoogieDeclarations]: Found implementation of procedure avoid_zero [2020-07-20 14:45:16,509 INFO L138 BoogieDeclarations]: Found implementation of procedure Id_MCDC_89 [2020-07-20 14:45:16,510 INFO L138 BoogieDeclarations]: Found implementation of procedure Id_MCDC_92 [2020-07-20 14:45:16,510 INFO L138 BoogieDeclarations]: Found implementation of procedure Id_MCDC_95 [2020-07-20 14:45:16,511 INFO L138 BoogieDeclarations]: Found implementation of procedure Id_MCDC_96 [2020-07-20 14:45:16,511 INFO L138 BoogieDeclarations]: Found implementation of procedure Id_MCDC_97 [2020-07-20 14:45:16,512 INFO L138 BoogieDeclarations]: Found implementation of procedure Id_MCDC_99 [2020-07-20 14:45:16,513 INFO L138 BoogieDeclarations]: Found implementation of procedure Id_MCDC_100 [2020-07-20 14:45:16,513 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 14:45:16,513 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-20 14:45:16,513 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 14:45:16,514 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-20 14:45:16,515 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-20 14:45:16,515 INFO L130 BoogieDeclarations]: Found specification of procedure avoid_zero [2020-07-20 14:45:16,515 INFO L130 BoogieDeclarations]: Found specification of procedure strcmp [2020-07-20 14:45:16,515 INFO L130 BoogieDeclarations]: Found specification of procedure Id_MCDC_89 [2020-07-20 14:45:16,516 INFO L130 BoogieDeclarations]: Found specification of procedure Id_MCDC_92 [2020-07-20 14:45:16,516 INFO L130 BoogieDeclarations]: Found specification of procedure Id_MCDC_95 [2020-07-20 14:45:16,516 INFO L130 BoogieDeclarations]: Found specification of procedure Id_MCDC_96 [2020-07-20 14:45:16,516 INFO L130 BoogieDeclarations]: Found specification of procedure Id_MCDC_97 [2020-07-20 14:45:16,517 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-07-20 14:45:16,517 INFO L130 BoogieDeclarations]: Found specification of procedure Id_MCDC_99 [2020-07-20 14:45:16,518 INFO L130 BoogieDeclarations]: Found specification of procedure Id_MCDC_100 [2020-07-20 14:45:16,519 INFO L130 BoogieDeclarations]: Found specification of procedure fopen [2020-07-20 14:45:16,519 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 14:45:16,519 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-20 14:45:16,520 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-07-20 14:45:16,520 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-07-20 14:45:16,520 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-07-20 14:45:16,520 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-07-20 14:45:16,521 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-07-20 14:45:16,521 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-07-20 14:45:16,521 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-07-20 14:45:16,521 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-07-20 14:45:16,521 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 14:45:16,521 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2020-07-20 14:45:16,522 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 14:45:17,662 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 14:45:17,662 INFO L295 CfgBuilder]: Removed 7 assume(true) statements. [2020-07-20 14:45:17,668 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 02:45:17 BoogieIcfgContainer [2020-07-20 14:45:17,669 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 14:45:17,670 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 14:45:17,670 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 14:45:17,674 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 14:45:17,674 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 02:45:15" (1/3) ... [2020-07-20 14:45:17,675 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@175ac5a3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 02:45:17, skipping insertion in model container [2020-07-20 14:45:17,675 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:45:16" (2/3) ... [2020-07-20 14:45:17,676 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@175ac5a3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 02:45:17, skipping insertion in model container [2020-07-20 14:45:17,676 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 02:45:17" (3/3) ... [2020-07-20 14:45:17,678 INFO L109 eAbstractionObserver]: Analyzing ICFG ofuf_2.c [2020-07-20 14:45:17,690 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 14:45:17,698 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 14:45:17,711 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 14:45:17,738 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 14:45:17,738 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 14:45:17,738 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 14:45:17,739 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 14:45:17,739 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 14:45:17,739 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 14:45:17,739 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 14:45:17,739 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 14:45:17,761 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states. [2020-07-20 14:45:17,770 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-20 14:45:17,771 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:45:17,772 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:45:17,773 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:45:17,779 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:45:17,780 INFO L82 PathProgramCache]: Analyzing trace with hash 1652927245, now seen corresponding path program 1 times [2020-07-20 14:45:17,790 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:45:17,790 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1260908080] [2020-07-20 14:45:17,791 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 [2020-07-20 14:45:18,111 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 14:45:18,112 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:45:18,117 INFO L263 TraceCheckSpWp]: Trace formula consists of 317 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 14:45:18,133 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:45:18,202 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 14:45:18,203 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 14:45:18,205 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1260908080] [2020-07-20 14:45:18,206 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 14:45:18,206 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 14:45:18,208 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2116259424] [2020-07-20 14:45:18,215 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 14:45:18,215 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:45:18,231 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 14:45:18,233 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 14:45:18,237 INFO L87 Difference]: Start difference. First operand 128 states. Second operand 3 states. [2020-07-20 14:45:18,342 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:45:18,342 INFO L93 Difference]: Finished difference Result 262 states and 403 transitions. [2020-07-20 14:45:18,343 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 14:45:18,345 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 39 [2020-07-20 14:45:18,345 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:45:18,361 INFO L225 Difference]: With dead ends: 262 [2020-07-20 14:45:18,361 INFO L226 Difference]: Without dead ends: 140 [2020-07-20 14:45:18,367 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 14:45:18,388 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2020-07-20 14:45:18,426 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 120. [2020-07-20 14:45:18,428 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 120 states. [2020-07-20 14:45:18,431 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 166 transitions. [2020-07-20 14:45:18,433 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 166 transitions. Word has length 39 [2020-07-20 14:45:18,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:45:18,434 INFO L479 AbstractCegarLoop]: Abstraction has 120 states and 166 transitions. [2020-07-20 14:45:18,434 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 14:45:18,434 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 166 transitions. [2020-07-20 14:45:18,442 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-20 14:45:18,442 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:45:18,442 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:45:18,656 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:45:18,656 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:45:18,657 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:45:18,657 INFO L82 PathProgramCache]: Analyzing trace with hash -296822387, now seen corresponding path program 1 times [2020-07-20 14:45:18,658 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:45:18,659 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1455620297] [2020-07-20 14:45:18,659 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 [2020-07-20 14:45:18,882 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 14:45:18,883 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:45:18,887 INFO L263 TraceCheckSpWp]: Trace formula consists of 322 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 14:45:18,894 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:45:18,915 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 14:45:18,915 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 14:45:18,916 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1455620297] [2020-07-20 14:45:18,917 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 14:45:18,918 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 14:45:18,918 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2054270920] [2020-07-20 14:45:18,922 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 14:45:18,925 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:45:18,925 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 14:45:18,926 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 14:45:18,926 INFO L87 Difference]: Start difference. First operand 120 states and 166 transitions. Second operand 3 states. [2020-07-20 14:45:18,964 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:45:18,964 INFO L93 Difference]: Finished difference Result 170 states and 230 transitions. [2020-07-20 14:45:18,965 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 14:45:18,965 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 41 [2020-07-20 14:45:18,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:45:18,968 INFO L225 Difference]: With dead ends: 170 [2020-07-20 14:45:18,969 INFO L226 Difference]: Without dead ends: 128 [2020-07-20 14:45:18,970 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 14:45:18,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2020-07-20 14:45:18,989 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 120. [2020-07-20 14:45:18,989 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 120 states. [2020-07-20 14:45:18,991 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 165 transitions. [2020-07-20 14:45:18,992 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 165 transitions. Word has length 41 [2020-07-20 14:45:18,992 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:45:18,992 INFO L479 AbstractCegarLoop]: Abstraction has 120 states and 165 transitions. [2020-07-20 14:45:18,992 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 14:45:18,993 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 165 transitions. [2020-07-20 14:45:18,995 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-07-20 14:45:18,995 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:45:18,996 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:45:19,209 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:45:19,210 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:45:19,211 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:45:19,212 INFO L82 PathProgramCache]: Analyzing trace with hash -469545370, now seen corresponding path program 1 times [2020-07-20 14:45:19,212 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:45:19,212 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1600795435] [2020-07-20 14:45:19,213 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 [2020-07-20 14:45:19,445 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 14:45:19,446 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:45:19,449 INFO L263 TraceCheckSpWp]: Trace formula consists of 324 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 14:45:19,453 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:45:19,469 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 14:45:19,470 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 14:45:19,470 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1600795435] [2020-07-20 14:45:19,470 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 14:45:19,471 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 14:45:19,471 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1118922608] [2020-07-20 14:45:19,471 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 14:45:19,472 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:45:19,472 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 14:45:19,472 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 14:45:19,472 INFO L87 Difference]: Start difference. First operand 120 states and 165 transitions. Second operand 3 states. [2020-07-20 14:45:19,535 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:45:19,535 INFO L93 Difference]: Finished difference Result 180 states and 246 transitions. [2020-07-20 14:45:19,536 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 14:45:19,536 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 42 [2020-07-20 14:45:19,537 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:45:19,540 INFO L225 Difference]: With dead ends: 180 [2020-07-20 14:45:19,540 INFO L226 Difference]: Without dead ends: 138 [2020-07-20 14:45:19,545 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 14:45:19,546 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2020-07-20 14:45:19,570 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 121. [2020-07-20 14:45:19,571 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 121 states. [2020-07-20 14:45:19,574 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 166 transitions. [2020-07-20 14:45:19,574 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 166 transitions. Word has length 42 [2020-07-20 14:45:19,575 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:45:19,575 INFO L479 AbstractCegarLoop]: Abstraction has 121 states and 166 transitions. [2020-07-20 14:45:19,575 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 14:45:19,575 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 166 transitions. [2020-07-20 14:45:19,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-07-20 14:45:19,582 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:45:19,583 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:45:19,796 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:45:19,797 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:45:19,797 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:45:19,797 INFO L82 PathProgramCache]: Analyzing trace with hash -1206740640, now seen corresponding path program 1 times [2020-07-20 14:45:19,798 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:45:19,798 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1843122316] [2020-07-20 14:45:19,798 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 [2020-07-20 14:45:20,000 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 14:45:20,000 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:45:20,004 INFO L263 TraceCheckSpWp]: Trace formula consists of 379 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 14:45:20,013 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:45:20,047 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 14:45:20,047 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 14:45:20,048 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1843122316] [2020-07-20 14:45:20,048 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 14:45:20,048 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 14:45:20,049 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1869301054] [2020-07-20 14:45:20,049 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 14:45:20,049 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:45:20,050 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 14:45:20,050 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 14:45:20,050 INFO L87 Difference]: Start difference. First operand 121 states and 166 transitions. Second operand 4 states. [2020-07-20 14:45:20,109 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:45:20,110 INFO L93 Difference]: Finished difference Result 161 states and 213 transitions. [2020-07-20 14:45:20,110 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 14:45:20,111 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 47 [2020-07-20 14:45:20,111 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:45:20,113 INFO L225 Difference]: With dead ends: 161 [2020-07-20 14:45:20,113 INFO L226 Difference]: Without dead ends: 128 [2020-07-20 14:45:20,114 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-20 14:45:20,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2020-07-20 14:45:20,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 128. [2020-07-20 14:45:20,125 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 128 states. [2020-07-20 14:45:20,126 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 174 transitions. [2020-07-20 14:45:20,126 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 174 transitions. Word has length 47 [2020-07-20 14:45:20,127 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:45:20,127 INFO L479 AbstractCegarLoop]: Abstraction has 128 states and 174 transitions. [2020-07-20 14:45:20,127 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 14:45:20,127 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 174 transitions. [2020-07-20 14:45:20,129 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-07-20 14:45:20,129 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:45:20,130 INFO L422 BasicCegarLoop]: trace histogram [2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:45:20,336 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:45:20,337 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:45:20,338 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:45:20,338 INFO L82 PathProgramCache]: Analyzing trace with hash -367196113, now seen corresponding path program 1 times [2020-07-20 14:45:20,339 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:45:20,340 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [286707077] [2020-07-20 14:45:20,340 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 [2020-07-20 14:45:20,571 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 14:45:20,571 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:45:20,574 INFO L263 TraceCheckSpWp]: Trace formula consists of 403 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-20 14:45:20,580 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:45:20,620 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 14:45:20,621 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:45:20,768 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 14:45:20,768 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [286707077] [2020-07-20 14:45:20,769 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:45:20,769 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 9 [2020-07-20 14:45:20,769 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1407789046] [2020-07-20 14:45:20,770 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 14:45:20,770 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:45:20,770 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 14:45:20,771 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2020-07-20 14:45:20,771 INFO L87 Difference]: Start difference. First operand 128 states and 174 transitions. Second operand 9 states. [2020-07-20 14:45:20,982 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:45:20,982 INFO L93 Difference]: Finished difference Result 176 states and 231 transitions. [2020-07-20 14:45:20,983 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 14:45:20,983 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 53 [2020-07-20 14:45:20,984 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:45:20,985 INFO L225 Difference]: With dead ends: 176 [2020-07-20 14:45:20,985 INFO L226 Difference]: Without dead ends: 142 [2020-07-20 14:45:20,986 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 96 SyntacticMatches, 2 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=107, Unknown=0, NotChecked=0, Total=156 [2020-07-20 14:45:20,987 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2020-07-20 14:45:20,996 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 142. [2020-07-20 14:45:20,997 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 142 states. [2020-07-20 14:45:20,998 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 190 transitions. [2020-07-20 14:45:20,999 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 190 transitions. Word has length 53 [2020-07-20 14:45:20,999 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:45:21,000 INFO L479 AbstractCegarLoop]: Abstraction has 142 states and 190 transitions. [2020-07-20 14:45:21,000 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 14:45:21,000 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 190 transitions. [2020-07-20 14:45:21,001 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-07-20 14:45:21,001 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:45:21,001 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:45:21,215 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:45:21,215 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:45:21,215 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:45:21,216 INFO L82 PathProgramCache]: Analyzing trace with hash -119201668, now seen corresponding path program 1 times [2020-07-20 14:45:21,216 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:45:21,216 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [793380796] [2020-07-20 14:45:21,216 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:45:21,499 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 14:45:21,499 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:45:21,503 INFO L263 TraceCheckSpWp]: Trace formula consists of 603 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 14:45:21,506 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:45:21,527 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-07-20 14:45:21,528 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:45:21,575 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-07-20 14:45:21,576 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [793380796] [2020-07-20 14:45:21,576 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:45:21,576 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6 [2020-07-20 14:45:21,576 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1621870858] [2020-07-20 14:45:21,577 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-20 14:45:21,577 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:45:21,578 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-20 14:45:21,578 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2020-07-20 14:45:21,578 INFO L87 Difference]: Start difference. First operand 142 states and 190 transitions. Second operand 6 states. [2020-07-20 14:45:21,765 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:45:21,765 INFO L93 Difference]: Finished difference Result 350 states and 496 transitions. [2020-07-20 14:45:21,766 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 14:45:21,766 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 55 [2020-07-20 14:45:21,766 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:45:21,789 INFO L225 Difference]: With dead ends: 350 [2020-07-20 14:45:21,789 INFO L226 Difference]: Without dead ends: 224 [2020-07-20 14:45:21,793 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 105 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=23, Unknown=0, NotChecked=0, Total=42 [2020-07-20 14:45:21,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 224 states. [2020-07-20 14:45:21,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 224 to 148. [2020-07-20 14:45:21,818 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 148 states. [2020-07-20 14:45:21,820 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 196 transitions. [2020-07-20 14:45:21,820 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 196 transitions. Word has length 55 [2020-07-20 14:45:21,820 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:45:21,821 INFO L479 AbstractCegarLoop]: Abstraction has 148 states and 196 transitions. [2020-07-20 14:45:21,821 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-20 14:45:21,821 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 196 transitions. [2020-07-20 14:45:21,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-07-20 14:45:21,824 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:45:21,824 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:45:22,038 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:45:22,039 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:45:22,040 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:45:22,040 INFO L82 PathProgramCache]: Analyzing trace with hash 1683290434, now seen corresponding path program 2 times [2020-07-20 14:45:22,041 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:45:22,041 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [276132394] [2020-07-20 14:45:22,042 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in