java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf --abstractinterpretationv2.abstract.domain IntervalDomain --traceabstraction.trace.refinement.strategy TAIPAN --traceabstraction.abstract.interpretation.mode USE_PREDICATES -i ../../../trunk/examples/svcomp/systemc/bist_cell.cil.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-f4eb214f-m [2019-10-13 21:29:05,098 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-13 21:29:05,101 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-13 21:29:05,119 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-13 21:29:05,119 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-13 21:29:05,121 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-13 21:29:05,123 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-13 21:29:05,131 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-13 21:29:05,135 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-13 21:29:05,139 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-13 21:29:05,140 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-13 21:29:05,142 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-13 21:29:05,142 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-13 21:29:05,144 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-13 21:29:05,146 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-13 21:29:05,147 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-13 21:29:05,149 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-13 21:29:05,149 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-13 21:29:05,151 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-13 21:29:05,155 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-13 21:29:05,159 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-13 21:29:05,162 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-13 21:29:05,164 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-13 21:29:05,164 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-13 21:29:05,166 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-10-13 21:29:05,167 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-10-13 21:29:05,167 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-10-13 21:29:05,168 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-10-13 21:29:05,169 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-10-13 21:29:05,170 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-10-13 21:29:05,171 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-10-13 21:29:05,172 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-10-13 21:29:05,173 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-10-13 21:29:05,173 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-10-13 21:29:05,175 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-10-13 21:29:05,175 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-10-13 21:29:05,176 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-10-13 21:29:05,176 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-10-13 21:29:05,176 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-13 21:29:05,177 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-13 21:29:05,178 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-13 21:29:05,179 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 [2019-10-13 21:29:05,210 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-13 21:29:05,211 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-13 21:29:05,212 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-13 21:29:05,212 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-13 21:29:05,215 INFO L138 SettingsManager]: * Use SBE=true [2019-10-13 21:29:05,216 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-13 21:29:05,216 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-13 21:29:05,216 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-13 21:29:05,216 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-13 21:29:05,216 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-13 21:29:05,216 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-13 21:29:05,217 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-13 21:29:05,217 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-13 21:29:05,217 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-13 21:29:05,217 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-13 21:29:05,217 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-13 21:29:05,218 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-13 21:29:05,218 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-13 21:29:05,218 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-13 21:29:05,220 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-13 21:29:05,220 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-13 21:29:05,220 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-13 21:29:05,220 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-13 21:29:05,220 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-13 21:29:05,221 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-13 21:29:05,221 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-13 21:29:05,221 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-13 21:29:05,221 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-13 21:29:05,222 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.analysis.abstractinterpretationv2: Abstract domain -> IntervalDomain Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> TAIPAN Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Abstract interpretation Mode -> USE_PREDICATES [2019-10-13 21:29:05,500 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-13 21:29:05,519 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-13 21:29:05,523 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-13 21:29:05,524 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-13 21:29:05,524 INFO L275 PluginConnector]: CDTParser initialized [2019-10-13 21:29:05,525 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/systemc/bist_cell.cil.c [2019-10-13 21:29:05,598 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a36651613/bf401aeb1a634f67b4fa3ad38aa55774/FLAG6773bec06 [2019-10-13 21:29:06,092 INFO L306 CDTParser]: Found 1 translation units. [2019-10-13 21:29:06,095 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/systemc/bist_cell.cil.c [2019-10-13 21:29:06,112 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a36651613/bf401aeb1a634f67b4fa3ad38aa55774/FLAG6773bec06 [2019-10-13 21:29:06,476 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a36651613/bf401aeb1a634f67b4fa3ad38aa55774 [2019-10-13 21:29:06,486 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-13 21:29:06,488 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-13 21:29:06,489 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-13 21:29:06,491 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-13 21:29:06,494 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-13 21:29:06,495 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 09:29:06" (1/1) ... [2019-10-13 21:29:06,498 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@77a1e17 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 09:29:06, skipping insertion in model container [2019-10-13 21:29:06,499 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 09:29:06" (1/1) ... [2019-10-13 21:29:06,507 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-13 21:29:06,560 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-13 21:29:06,786 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-13 21:29:06,791 INFO L188 MainTranslator]: Completed pre-run [2019-10-13 21:29:06,922 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-13 21:29:06,942 INFO L192 MainTranslator]: Completed translation [2019-10-13 21:29:06,942 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 09:29:06 WrapperNode [2019-10-13 21:29:06,943 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-13 21:29:06,943 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-13 21:29:06,943 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-13 21:29:06,943 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-13 21:29:06,952 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 09:29:06" (1/1) ... [2019-10-13 21:29:06,952 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 09:29:06" (1/1) ... [2019-10-13 21:29:06,961 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 09:29:06" (1/1) ... [2019-10-13 21:29:06,961 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 09:29:06" (1/1) ... [2019-10-13 21:29:06,970 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 09:29:06" (1/1) ... [2019-10-13 21:29:06,985 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 09:29:06" (1/1) ... [2019-10-13 21:29:06,987 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 09:29:06" (1/1) ... [2019-10-13 21:29:06,992 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-13 21:29:06,993 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-13 21:29:06,993 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-13 21:29:06,993 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-13 21:29:06,994 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 09:29:06" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-13 21:29:07,043 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-13 21:29:07,043 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-13 21:29:07,044 INFO L138 BoogieDeclarations]: Found implementation of procedure error [2019-10-13 21:29:07,044 INFO L138 BoogieDeclarations]: Found implementation of procedure method1 [2019-10-13 21:29:07,045 INFO L138 BoogieDeclarations]: Found implementation of procedure is_method1_triggered [2019-10-13 21:29:07,046 INFO L138 BoogieDeclarations]: Found implementation of procedure update_b0 [2019-10-13 21:29:07,046 INFO L138 BoogieDeclarations]: Found implementation of procedure update_b1 [2019-10-13 21:29:07,046 INFO L138 BoogieDeclarations]: Found implementation of procedure update_d0 [2019-10-13 21:29:07,046 INFO L138 BoogieDeclarations]: Found implementation of procedure update_d1 [2019-10-13 21:29:07,047 INFO L138 BoogieDeclarations]: Found implementation of procedure update_z [2019-10-13 21:29:07,047 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels [2019-10-13 21:29:07,047 INFO L138 BoogieDeclarations]: Found implementation of procedure init_threads [2019-10-13 21:29:07,047 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread [2019-10-13 21:29:07,048 INFO L138 BoogieDeclarations]: Found implementation of procedure eval [2019-10-13 21:29:07,048 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events [2019-10-13 21:29:07,048 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events [2019-10-13 21:29:07,049 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads [2019-10-13 21:29:07,049 INFO L138 BoogieDeclarations]: Found implementation of procedure stop_simulation [2019-10-13 21:29:07,049 INFO L138 BoogieDeclarations]: Found implementation of procedure start_simulation [2019-10-13 21:29:07,049 INFO L138 BoogieDeclarations]: Found implementation of procedure init_model [2019-10-13 21:29:07,049 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-13 21:29:07,050 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-13 21:29:07,050 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-10-13 21:29:07,050 INFO L130 BoogieDeclarations]: Found specification of procedure error [2019-10-13 21:29:07,050 INFO L130 BoogieDeclarations]: Found specification of procedure method1 [2019-10-13 21:29:07,050 INFO L130 BoogieDeclarations]: Found specification of procedure is_method1_triggered [2019-10-13 21:29:07,051 INFO L130 BoogieDeclarations]: Found specification of procedure update_b0 [2019-10-13 21:29:07,051 INFO L130 BoogieDeclarations]: Found specification of procedure update_b1 [2019-10-13 21:29:07,051 INFO L130 BoogieDeclarations]: Found specification of procedure update_d0 [2019-10-13 21:29:07,051 INFO L130 BoogieDeclarations]: Found specification of procedure update_d1 [2019-10-13 21:29:07,051 INFO L130 BoogieDeclarations]: Found specification of procedure update_z [2019-10-13 21:29:07,051 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels [2019-10-13 21:29:07,051 INFO L130 BoogieDeclarations]: Found specification of procedure init_threads [2019-10-13 21:29:07,052 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread [2019-10-13 21:29:07,052 INFO L130 BoogieDeclarations]: Found specification of procedure eval [2019-10-13 21:29:07,052 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events [2019-10-13 21:29:07,052 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events [2019-10-13 21:29:07,052 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads [2019-10-13 21:29:07,052 INFO L130 BoogieDeclarations]: Found specification of procedure stop_simulation [2019-10-13 21:29:07,052 INFO L130 BoogieDeclarations]: Found specification of procedure start_simulation [2019-10-13 21:29:07,053 INFO L130 BoogieDeclarations]: Found specification of procedure init_model [2019-10-13 21:29:07,053 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-13 21:29:07,053 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-13 21:29:07,053 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-13 21:29:07,554 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-13 21:29:07,554 INFO L284 CfgBuilder]: Removed 2 assume(true) statements. [2019-10-13 21:29:07,556 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 09:29:07 BoogieIcfgContainer [2019-10-13 21:29:07,556 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-13 21:29:07,557 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-13 21:29:07,557 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-13 21:29:07,561 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-13 21:29:07,562 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 13.10 09:29:06" (1/3) ... [2019-10-13 21:29:07,563 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3350949c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 09:29:07, skipping insertion in model container [2019-10-13 21:29:07,563 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 09:29:06" (2/3) ... [2019-10-13 21:29:07,563 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3350949c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 09:29:07, skipping insertion in model container [2019-10-13 21:29:07,564 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 09:29:07" (3/3) ... [2019-10-13 21:29:07,568 INFO L109 eAbstractionObserver]: Analyzing ICFG bist_cell.cil.c [2019-10-13 21:29:07,578 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-13 21:29:07,587 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-13 21:29:07,596 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-13 21:29:07,621 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-13 21:29:07,621 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-13 21:29:07,621 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-13 21:29:07,621 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-13 21:29:07,622 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-13 21:29:07,622 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-13 21:29:07,622 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-13 21:29:07,622 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-13 21:29:07,641 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states. [2019-10-13 21:29:07,649 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2019-10-13 21:29:07,649 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 21:29:07,650 INFO L380 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 21:29:07,652 INFO L410 AbstractCegarLoop]: === Iteration 1 === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 21:29:07,657 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 21:29:07,657 INFO L82 PathProgramCache]: Analyzing trace with hash -778963544, now seen corresponding path program 1 times [2019-10-13 21:29:07,665 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-13 21:29:07,666 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1635655394] [2019-10-13 21:29:07,666 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 21:29:07,666 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 21:29:07,666 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 21:29:07,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 21:29:07,975 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-13 21:29:07,975 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1635655394] [2019-10-13 21:29:07,976 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-13 21:29:07,977 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-13 21:29:07,977 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [382865430] [2019-10-13 21:29:07,982 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-13 21:29:07,983 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-10-13 21:29:07,994 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-13 21:29:07,995 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-13 21:29:07,996 INFO L87 Difference]: Start difference. First operand 141 states. Second operand 4 states. [2019-10-13 21:29:08,219 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 21:29:08,220 INFO L93 Difference]: Finished difference Result 265 states and 367 transitions. [2019-10-13 21:29:08,221 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-13 21:29:08,222 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 58 [2019-10-13 21:29:08,223 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 21:29:08,236 INFO L225 Difference]: With dead ends: 265 [2019-10-13 21:29:08,237 INFO L226 Difference]: Without dead ends: 134 [2019-10-13 21:29:08,242 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-13 21:29:08,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2019-10-13 21:29:08,329 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 134. [2019-10-13 21:29:08,330 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 134 states. [2019-10-13 21:29:08,345 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 179 transitions. [2019-10-13 21:29:08,348 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 179 transitions. Word has length 58 [2019-10-13 21:29:08,350 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 21:29:08,350 INFO L462 AbstractCegarLoop]: Abstraction has 134 states and 179 transitions. [2019-10-13 21:29:08,351 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-13 21:29:08,351 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 179 transitions. [2019-10-13 21:29:08,363 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2019-10-13 21:29:08,363 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 21:29:08,363 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 21:29:08,364 INFO L410 AbstractCegarLoop]: === Iteration 2 === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 21:29:08,364 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 21:29:08,364 INFO L82 PathProgramCache]: Analyzing trace with hash -820467770, now seen corresponding path program 1 times [2019-10-13 21:29:08,364 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-13 21:29:08,365 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1306306600] [2019-10-13 21:29:08,365 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 21:29:08,365 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 21:29:08,366 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 21:29:08,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 21:29:08,598 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-10-13 21:29:08,599 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1306306600] [2019-10-13 21:29:08,599 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [568029522] [2019-10-13 21:29:08,599 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 21:29:08,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 21:29:08,781 INFO L256 TraceCheckSpWp]: Trace formula consists of 867 conjuncts, 8 conjunts are in the unsatisfiable core [2019-10-13 21:29:08,805 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 21:29:08,919 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-10-13 21:29:08,919 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-13 21:29:09,203 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 21:29:09,220 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 21:29:09,234 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 21:29:09,276 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-10-13 21:29:09,277 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleAbstractInterpretation [1025268007] [2019-10-13 21:29:09,284 INFO L211 CegarAbsIntRunner]: Running AI on error trace of length 126 [2019-10-13 21:29:09,329 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-10-13 21:29:09,330 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-10-13 21:29:09,441 INFO L266 AbstractInterpreter]: Error location(s) were unreachable [2019-10-13 21:29:09,443 INFO L272 AbstractInterpreter]: Visited 14 different actions 14 times. Never merged. Never widened. Performed 158 root evaluator evaluations with a maximum evaluation depth of 3. Performed 158 inverse root evaluator evaluations with a maximum inverse evaluation depth of 3. Never found a fixpoint. Largest state had 47 variables. [2019-10-13 21:29:09,448 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 21:29:09,448 INFO L536 sIntCurrentIteration]: Generating AbsInt predicates [2019-10-13 21:29:09,594 INFO L227 lantSequenceWeakener]: Weakened 12 states. On average, predicates are now at 86.41% of their original sizes. [2019-10-13 21:29:09,594 INFO L551 sIntCurrentIteration]: Unifying AI predicates [2019-10-13 21:29:09,609 INFO L553 sIntCurrentIteration]: We unified 124 AI predicates to 124 [2019-10-13 21:29:09,609 INFO L562 sIntCurrentIteration]: Finished generation of AbsInt predicates [2019-10-13 21:29:09,612 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 3 imperfect interpolant sequences. [2019-10-13 21:29:09,612 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5, 5, 5] total 11 [2019-10-13 21:29:09,612 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [777138273] [2019-10-13 21:29:09,614 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-13 21:29:09,616 INFO L137 tionRefinementEngine]: Using predicate unifier AbsIntPredicateUnifier provided by strategy TAIPAN [2019-10-13 21:29:09,616 INFO L124 tionRefinementEngine]: Using hoare triple checker CachingHoareTripleCheckerMap provided by strategy [2019-10-13 21:29:09,616 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-13 21:29:09,617 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-13 21:29:09,617 INFO L87 Difference]: Start difference. First operand 134 states and 179 transitions. Second operand 3 states. [2019-10-13 21:29:09,810 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 21:29:09,810 INFO L93 Difference]: Finished difference Result 259 states and 352 transitions. [2019-10-13 21:29:09,810 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-13 21:29:09,810 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 125 [2019-10-13 21:29:09,811 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 21:29:09,813 INFO L225 Difference]: With dead ends: 259 [2019-10-13 21:29:09,813 INFO L226 Difference]: Without dead ends: 138 [2019-10-13 21:29:09,815 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 123 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-13 21:29:09,815 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2019-10-13 21:29:09,830 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 135. [2019-10-13 21:29:09,831 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 135 states. [2019-10-13 21:29:09,833 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 180 transitions. [2019-10-13 21:29:09,834 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 180 transitions. Word has length 125 [2019-10-13 21:29:09,834 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 21:29:09,834 INFO L462 AbstractCegarLoop]: Abstraction has 135 states and 180 transitions. [2019-10-13 21:29:09,834 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-13 21:29:09,834 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 180 transitions. [2019-10-13 21:29:09,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2019-10-13 21:29:09,839 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 21:29:09,840 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 21:29:10,043 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 21:29:10,044 INFO L410 AbstractCegarLoop]: === Iteration 3 === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 21:29:10,045 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 21:29:10,045 INFO L82 PathProgramCache]: Analyzing trace with hash 149420437, now seen corresponding path program 1 times [2019-10-13 21:29:10,046 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-13 21:29:10,046 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [538445581] [2019-10-13 21:29:10,046 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 21:29:10,046 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 21:29:10,047 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 21:29:10,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 21:29:10,262 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-10-13 21:29:10,263 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [538445581] [2019-10-13 21:29:10,263 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1045260915] [2019-10-13 21:29:10,263 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 21:29:10,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 21:29:10,460 INFO L256 TraceCheckSpWp]: Trace formula consists of 890 conjuncts, 8 conjunts are in the unsatisfiable core [2019-10-13 21:29:10,482 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 21:29:10,554 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-10-13 21:29:10,554 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-13 21:29:10,781 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 21:29:10,794 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 21:29:10,814 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 21:29:10,832 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 21:29:10,877 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-10-13 21:29:10,877 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleAbstractInterpretation [1544060156] [2019-10-13 21:29:10,877 INFO L211 CegarAbsIntRunner]: Running AI on error trace of length 131 [2019-10-13 21:29:10,894 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-10-13 21:29:10,894 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-10-13 21:29:10,926 INFO L266 AbstractInterpreter]: Error location(s) were unreachable [2019-10-13 21:29:10,927 INFO L272 AbstractInterpreter]: Visited 21 different actions 21 times. Never merged. Never widened. Performed 188 root evaluator evaluations with a maximum evaluation depth of 3. Performed 188 inverse root evaluator evaluations with a maximum inverse evaluation depth of 3. Never found a fixpoint. Largest state had 47 variables. [2019-10-13 21:29:10,928 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 21:29:10,928 INFO L536 sIntCurrentIteration]: Generating AbsInt predicates [2019-10-13 21:29:10,979 INFO L227 lantSequenceWeakener]: Weakened 18 states. On average, predicates are now at 81.22% of their original sizes. [2019-10-13 21:29:10,979 INFO L551 sIntCurrentIteration]: Unifying AI predicates [2019-10-13 21:29:11,006 INFO L553 sIntCurrentIteration]: We unified 129 AI predicates to 129 [2019-10-13 21:29:11,006 INFO L562 sIntCurrentIteration]: Finished generation of AbsInt predicates [2019-10-13 21:29:11,007 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 3 imperfect interpolant sequences. [2019-10-13 21:29:11,007 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [10, 5, 5] total 19 [2019-10-13 21:29:11,007 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1692645608] [2019-10-13 21:29:11,008 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-10-13 21:29:11,008 INFO L137 tionRefinementEngine]: Using predicate unifier AbsIntPredicateUnifier provided by strategy TAIPAN [2019-10-13 21:29:11,008 INFO L124 tionRefinementEngine]: Using hoare triple checker CachingHoareTripleCheckerMap provided by strategy [2019-10-13 21:29:11,009 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-10-13 21:29:11,009 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2019-10-13 21:29:11,009 INFO L87 Difference]: Start difference. First operand 135 states and 180 transitions. Second operand 6 states. [2019-10-13 21:29:11,535 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 21:29:11,536 INFO L93 Difference]: Finished difference Result 265 states and 360 transitions. [2019-10-13 21:29:11,536 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-10-13 21:29:11,536 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 130 [2019-10-13 21:29:11,538 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 21:29:11,539 INFO L225 Difference]: With dead ends: 265 [2019-10-13 21:29:11,539 INFO L226 Difference]: Without dead ends: 144 [2019-10-13 21:29:11,541 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 125 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2019-10-13 21:29:11,544 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2019-10-13 21:29:11,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 141. [2019-10-13 21:29:11,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 141 states. [2019-10-13 21:29:11,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 186 transitions. [2019-10-13 21:29:11,565 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 186 transitions. Word has length 130 [2019-10-13 21:29:11,567 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 21:29:11,567 INFO L462 AbstractCegarLoop]: Abstraction has 141 states and 186 transitions. [2019-10-13 21:29:11,568 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-10-13 21:29:11,568 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 186 transitions. [2019-10-13 21:29:11,569 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2019-10-13 21:29:11,569 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 21:29:11,570 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 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] [2019-10-13 21:29:11,774 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 21:29:11,774 INFO L410 AbstractCegarLoop]: === Iteration 4 === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 21:29:11,775 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 21:29:11,775 INFO L82 PathProgramCache]: Analyzing trace with hash 852982624, now seen corresponding path program 1 times [2019-10-13 21:29:11,775 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-13 21:29:11,776 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [12011067] [2019-10-13 21:29:11,776 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 21:29:11,776 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 21:29:11,776 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 21:29:11,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 21:29:11,901 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-10-13 21:29:11,902 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [12011067] [2019-10-13 21:29:11,902 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [74025780] [2019-10-13 21:29:11,902 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 21:29:12,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 21:29:12,055 INFO L256 TraceCheckSpWp]: Trace formula consists of 913 conjuncts, 8 conjunts are in the unsatisfiable core [2019-10-13 21:29:12,060 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 21:29:12,120 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-10-13 21:29:12,120 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-13 21:29:12,324 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 21:29:12,345 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 21:29:12,366 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 21:29:12,380 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 21:29:12,383 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 21:29:12,407 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-10-13 21:29:12,407 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleAbstractInterpretation [1061186438] [2019-10-13 21:29:12,407 INFO L211 CegarAbsIntRunner]: Running AI on error trace of length 136 [2019-10-13 21:29:12,412 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-10-13 21:29:12,412 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-10-13 21:29:12,427 INFO L266 AbstractInterpreter]: Error location(s) were unreachable [2019-10-13 21:29:12,427 INFO L272 AbstractInterpreter]: Visited 28 different actions 28 times. Never merged. Never widened. Performed 218 root evaluator evaluations with a maximum evaluation depth of 3. Performed 218 inverse root evaluator evaluations with a maximum inverse evaluation depth of 3. Never found a fixpoint. Largest state had 47 variables. [2019-10-13 21:29:12,427 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 21:29:12,428 INFO L536 sIntCurrentIteration]: Generating AbsInt predicates [2019-10-13 21:29:12,460 INFO L227 lantSequenceWeakener]: Weakened 24 states. On average, predicates are now at 78.06% of their original sizes. [2019-10-13 21:29:12,461 INFO L551 sIntCurrentIteration]: Unifying AI predicates [2019-10-13 21:29:12,533 INFO L553 sIntCurrentIteration]: We unified 134 AI predicates to 134 [2019-10-13 21:29:12,533 INFO L562 sIntCurrentIteration]: Finished generation of AbsInt predicates [2019-10-13 21:29:12,534 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 3 imperfect interpolant sequences. [2019-10-13 21:29:12,534 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [10, 5, 5] total 22 [2019-10-13 21:29:12,534 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [994494432] [2019-10-13 21:29:12,535 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-10-13 21:29:12,535 INFO L137 tionRefinementEngine]: Using predicate unifier AbsIntPredicateUnifier provided by strategy TAIPAN [2019-10-13 21:29:12,535 INFO L124 tionRefinementEngine]: Using hoare triple checker CachingHoareTripleCheckerMap provided by strategy [2019-10-13 21:29:12,536 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-10-13 21:29:12,536 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2019-10-13 21:29:12,536 INFO L87 Difference]: Start difference. First operand 141 states and 186 transitions. Second operand 9 states. [2019-10-13 21:29:13,026 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 21:29:13,026 INFO L93 Difference]: Finished difference Result 271 states and 366 transitions. [2019-10-13 21:29:13,026 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-10-13 21:29:13,026 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 135 [2019-10-13 21:29:13,027 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 21:29:13,028 INFO L225 Difference]: With dead ends: 271 [2019-10-13 21:29:13,028 INFO L226 Difference]: Without dead ends: 150 [2019-10-13 21:29:13,029 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 127 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2019-10-13 21:29:13,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2019-10-13 21:29:13,041 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 147. [2019-10-13 21:29:13,041 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 147 states. [2019-10-13 21:29:13,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 192 transitions. [2019-10-13 21:29:13,043 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 192 transitions. Word has length 135 [2019-10-13 21:29:13,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 21:29:13,043 INFO L462 AbstractCegarLoop]: Abstraction has 147 states and 192 transitions. [2019-10-13 21:29:13,043 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-10-13 21:29:13,043 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 192 transitions. [2019-10-13 21:29:13,045 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2019-10-13 21:29:13,045 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 21:29:13,045 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 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] [2019-10-13 21:29:13,250 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 21:29:13,250 INFO L410 AbstractCegarLoop]: === Iteration 5 === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 21:29:13,250 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 21:29:13,250 INFO L82 PathProgramCache]: Analyzing trace with hash -439141822, now seen corresponding path program 1 times [2019-10-13 21:29:13,251 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-13 21:29:13,251 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [150566958] [2019-10-13 21:29:13,252 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 21:29:13,252 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 21:29:13,252 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 21:29:13,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 21:29:13,375 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-10-13 21:29:13,375 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [150566958] [2019-10-13 21:29:13,375 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2132280202] [2019-10-13 21:29:13,376 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 21:29:13,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 21:29:13,555 INFO L256 TraceCheckSpWp]: Trace formula consists of 936 conjuncts, 8 conjunts are in the unsatisfiable core [2019-10-13 21:29:13,561 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 21:29:13,624 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-10-13 21:29:13,624 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-13 21:29:13,946 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 21:29:13,959 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 21:29:13,975 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 21:29:13,989 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 21:29:13,992 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 21:29:13,996 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 21:29:14,019 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-10-13 21:29:14,020 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleAbstractInterpretation [1310173180] [2019-10-13 21:29:14,021 INFO L211 CegarAbsIntRunner]: Running AI on error trace of length 141 [2019-10-13 21:29:14,030 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-10-13 21:29:14,030 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-10-13 21:29:14,051 INFO L266 AbstractInterpreter]: Error location(s) were unreachable [2019-10-13 21:29:14,052 INFO L272 AbstractInterpreter]: Visited 35 different actions 35 times. Never merged. Never widened. Performed 248 root evaluator evaluations with a maximum evaluation depth of 3. Performed 248 inverse root evaluator evaluations with a maximum inverse evaluation depth of 3. Never found a fixpoint. Largest state had 47 variables. [2019-10-13 21:29:14,052 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 21:29:14,053 INFO L536 sIntCurrentIteration]: Generating AbsInt predicates [2019-10-13 21:29:14,088 INFO L227 lantSequenceWeakener]: Weakened 30 states. On average, predicates are now at 75.71% of their original sizes. [2019-10-13 21:29:14,088 INFO L551 sIntCurrentIteration]: Unifying AI predicates [2019-10-13 21:29:14,169 INFO L553 sIntCurrentIteration]: We unified 139 AI predicates to 139 [2019-10-13 21:29:14,169 INFO L562 sIntCurrentIteration]: Finished generation of AbsInt predicates [2019-10-13 21:29:14,169 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 3 imperfect interpolant sequences. [2019-10-13 21:29:14,170 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [10, 5, 5] total 23 [2019-10-13 21:29:14,170 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [785271165] [2019-10-13 21:29:14,170 INFO L442 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-10-13 21:29:14,171 INFO L137 tionRefinementEngine]: Using predicate unifier AbsIntPredicateUnifier provided by strategy TAIPAN [2019-10-13 21:29:14,171 INFO L124 tionRefinementEngine]: Using hoare triple checker CachingHoareTripleCheckerMap provided by strategy [2019-10-13 21:29:14,171 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-10-13 21:29:14,171 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2019-10-13 21:29:14,172 INFO L87 Difference]: Start difference. First operand 147 states and 192 transitions. Second operand 12 states. [2019-10-13 21:29:14,891 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 21:29:14,891 INFO L93 Difference]: Finished difference Result 277 states and 372 transitions. [2019-10-13 21:29:14,891 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-10-13 21:29:14,891 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 140 [2019-10-13 21:29:14,892 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 21:29:14,893 INFO L225 Difference]: With dead ends: 277 [2019-10-13 21:29:14,893 INFO L226 Difference]: Without dead ends: 156 [2019-10-13 21:29:14,893 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 129 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2019-10-13 21:29:14,894 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2019-10-13 21:29:14,903 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 153. [2019-10-13 21:29:14,903 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 153 states. [2019-10-13 21:29:14,904 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 198 transitions. [2019-10-13 21:29:14,905 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 198 transitions. Word has length 140 [2019-10-13 21:29:14,905 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 21:29:14,905 INFO L462 AbstractCegarLoop]: Abstraction has 153 states and 198 transitions. [2019-10-13 21:29:14,905 INFO L463 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-10-13 21:29:14,905 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 198 transitions. [2019-10-13 21:29:14,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2019-10-13 21:29:14,907 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 21:29:14,907 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 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] [2019-10-13 21:29:15,112 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 21:29:15,114 INFO L410 AbstractCegarLoop]: === Iteration 6 === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 21:29:15,115 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 21:29:15,115 INFO L82 PathProgramCache]: Analyzing trace with hash -404425876, now seen corresponding path program 1 times [2019-10-13 21:29:15,115 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-13 21:29:15,116 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [855119212] [2019-10-13 21:29:15,116 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 21:29:15,116 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 21:29:15,116 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 21:29:15,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 21:29:15,195 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2019-10-13 21:29:15,196 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [855119212] [2019-10-13 21:29:15,196 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1658954088] [2019-10-13 21:29:15,196 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 21:29:15,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 21:29:15,367 INFO L256 TraceCheckSpWp]: Trace formula consists of 956 conjuncts, 9 conjunts are in the unsatisfiable core [2019-10-13 21:29:15,373 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 21:29:15,514 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2019-10-13 21:29:15,514 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-13 21:29:15,788 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 21:29:15,803 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 21:29:15,806 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 21:29:15,809 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 21:29:15,811 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 21:29:15,845 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2019-10-13 21:29:15,845 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleAbstractInterpretation [1165761701] [2019-10-13 21:29:15,846 INFO L211 CegarAbsIntRunner]: Running AI on error trace of length 146 [2019-10-13 21:29:15,851 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-10-13 21:29:15,858 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-10-13 21:29:15,881 INFO L266 AbstractInterpreter]: Error location(s) were unreachable [2019-10-13 21:29:15,881 INFO L272 AbstractInterpreter]: Visited 38 different actions 38 times. Never merged. Never widened. Performed 272 root evaluator evaluations with a maximum evaluation depth of 4. Performed 272 inverse root evaluator evaluations with a maximum inverse evaluation depth of 4. Never found a fixpoint. Largest state had 47 variables. [2019-10-13 21:29:15,881 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 21:29:15,882 INFO L536 sIntCurrentIteration]: Generating AbsInt predicates [2019-10-13 21:29:15,924 INFO L227 lantSequenceWeakener]: Weakened 32 states. On average, predicates are now at 71.97% of their original sizes. [2019-10-13 21:29:15,924 INFO L551 sIntCurrentIteration]: Unifying AI predicates [2019-10-13 21:29:16,026 INFO L553 sIntCurrentIteration]: We unified 144 AI predicates to 144 [2019-10-13 21:29:16,027 INFO L562 sIntCurrentIteration]: Finished generation of AbsInt predicates [2019-10-13 21:29:16,027 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 3 imperfect interpolant sequences. [2019-10-13 21:29:16,027 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [5, 7, 5] total 24 [2019-10-13 21:29:16,028 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1063385181] [2019-10-13 21:29:16,028 INFO L442 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-10-13 21:29:16,029 INFO L137 tionRefinementEngine]: Using predicate unifier AbsIntPredicateUnifier provided by strategy TAIPAN [2019-10-13 21:29:16,029 INFO L124 tionRefinementEngine]: Using hoare triple checker CachingHoareTripleCheckerMap provided by strategy [2019-10-13 21:29:16,029 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-10-13 21:29:16,029 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=126, Unknown=0, NotChecked=0, Total=156 [2019-10-13 21:29:16,029 INFO L87 Difference]: Start difference. First operand 153 states and 198 transitions. Second operand 13 states. [2019-10-13 21:29:17,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 21:29:17,002 INFO L93 Difference]: Finished difference Result 276 states and 369 transitions. [2019-10-13 21:29:17,002 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-10-13 21:29:17,003 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 145 [2019-10-13 21:29:17,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 21:29:17,004 INFO L225 Difference]: With dead ends: 276 [2019-10-13 21:29:17,004 INFO L226 Difference]: Without dead ends: 155 [2019-10-13 21:29:17,005 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 133 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=126, Unknown=0, NotChecked=0, Total=156 [2019-10-13 21:29:17,006 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2019-10-13 21:29:17,014 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 155. [2019-10-13 21:29:17,014 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 155 states. [2019-10-13 21:29:17,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 155 states to 155 states and 201 transitions. [2019-10-13 21:29:17,016 INFO L78 Accepts]: Start accepts. Automaton has 155 states and 201 transitions. Word has length 145 [2019-10-13 21:29:17,016 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 21:29:17,016 INFO L462 AbstractCegarLoop]: Abstraction has 155 states and 201 transitions. [2019-10-13 21:29:17,016 INFO L463 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-10-13 21:29:17,016 INFO L276 IsEmpty]: Start isEmpty. Operand 155 states and 201 transitions. [2019-10-13 21:29:17,018 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2019-10-13 21:29:17,018 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 21:29:17,018 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 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] [2019-10-13 21:29:17,223 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 21:29:17,223 INFO L410 AbstractCegarLoop]: === Iteration 7 === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 21:29:17,223 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 21:29:17,224 INFO L82 PathProgramCache]: Analyzing trace with hash -875782226, now seen corresponding path program 1 times [2019-10-13 21:29:17,224 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-13 21:29:17,224 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1601028926] [2019-10-13 21:29:17,224 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 21:29:17,224 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 21:29:17,224 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 21:29:17,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 21:29:17,366 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-10-13 21:29:17,366 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1601028926] [2019-10-13 21:29:17,366 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1048636835] [2019-10-13 21:29:17,367 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 21:29:17,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 21:29:17,541 INFO L256 TraceCheckSpWp]: Trace formula consists of 959 conjuncts, 8 conjunts are in the unsatisfiable core [2019-10-13 21:29:17,545 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 21:29:17,594 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-10-13 21:29:17,594 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-13 21:29:17,744 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 21:29:17,755 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 21:29:17,773 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 21:29:17,786 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 21:29:17,788 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 21:29:17,795 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 21:29:17,797 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 21:29:17,821 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-10-13 21:29:17,822 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleAbstractInterpretation [1158278576] [2019-10-13 21:29:17,822 INFO L211 CegarAbsIntRunner]: Running AI on error trace of length 146 [2019-10-13 21:29:17,824 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-10-13 21:29:17,824 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-10-13 21:29:17,843 INFO L266 AbstractInterpreter]: Error location(s) were unreachable [2019-10-13 21:29:17,844 INFO L272 AbstractInterpreter]: Visited 53 different actions 53 times. Never merged. Never widened. Performed 332 root evaluator evaluations with a maximum evaluation depth of 3. Performed 332 inverse root evaluator evaluations with a maximum inverse evaluation depth of 3. Never found a fixpoint. Largest state had 47 variables. [2019-10-13 21:29:17,844 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 21:29:17,845 INFO L536 sIntCurrentIteration]: Generating AbsInt predicates [2019-10-13 21:29:17,915 INFO L227 lantSequenceWeakener]: Weakened 47 states. On average, predicates are now at 73.88% of their original sizes. [2019-10-13 21:29:17,915 INFO L551 sIntCurrentIteration]: Unifying AI predicates [2019-10-13 21:29:18,161 INFO L553 sIntCurrentIteration]: We unified 144 AI predicates to 144 [2019-10-13 21:29:18,161 INFO L562 sIntCurrentIteration]: Finished generation of AbsInt predicates [2019-10-13 21:29:18,162 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 3 imperfect interpolant sequences. [2019-10-13 21:29:18,162 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [10, 5, 5] total 30 [2019-10-13 21:29:18,163 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1927421471] [2019-10-13 21:29:18,164 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-10-13 21:29:18,164 INFO L137 tionRefinementEngine]: Using predicate unifier AbsIntPredicateUnifier provided by strategy TAIPAN [2019-10-13 21:29:18,164 INFO L124 tionRefinementEngine]: Using hoare triple checker CachingHoareTripleCheckerMap provided by strategy [2019-10-13 21:29:18,165 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-10-13 21:29:18,165 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=298, Unknown=0, NotChecked=0, Total=342 [2019-10-13 21:29:18,166 INFO L87 Difference]: Start difference. First operand 155 states and 201 transitions. Second operand 19 states. [2019-10-13 21:29:19,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 21:29:19,740 INFO L93 Difference]: Finished difference Result 286 states and 381 transitions. [2019-10-13 21:29:19,740 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-10-13 21:29:19,740 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 145 [2019-10-13 21:29:19,740 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 21:29:19,741 INFO L225 Difference]: With dead ends: 286 [2019-10-13 21:29:19,741 INFO L226 Difference]: Without dead ends: 165 [2019-10-13 21:29:19,745 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 127 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=44, Invalid=298, Unknown=0, NotChecked=0, Total=342 [2019-10-13 21:29:19,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165 states. [2019-10-13 21:29:19,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165 to 165. [2019-10-13 21:29:19,755 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 165 states. [2019-10-13 21:29:19,757 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 165 states to 165 states and 209 transitions. [2019-10-13 21:29:19,757 INFO L78 Accepts]: Start accepts. Automaton has 165 states and 209 transitions. Word has length 145 [2019-10-13 21:29:19,757 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 21:29:19,757 INFO L462 AbstractCegarLoop]: Abstraction has 165 states and 209 transitions. [2019-10-13 21:29:19,758 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-10-13 21:29:19,758 INFO L276 IsEmpty]: Start isEmpty. Operand 165 states and 209 transitions. [2019-10-13 21:29:19,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2019-10-13 21:29:19,761 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 21:29:19,761 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 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] [2019-10-13 21:29:19,966 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 21:29:19,967 INFO L410 AbstractCegarLoop]: === Iteration 8 === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 21:29:19,967 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 21:29:19,967 INFO L82 PathProgramCache]: Analyzing trace with hash 1818113964, now seen corresponding path program 1 times [2019-10-13 21:29:19,968 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-13 21:29:19,968 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1995461836] [2019-10-13 21:29:19,968 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 21:29:19,969 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 21:29:19,969 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 21:29:19,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 21:29:20,081 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-10-13 21:29:20,082 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1995461836] [2019-10-13 21:29:20,082 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [175943543] [2019-10-13 21:29:20,082 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 21:29:20,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 21:29:20,257 INFO L256 TraceCheckSpWp]: Trace formula consists of 962 conjuncts, 8 conjunts are in the unsatisfiable core [2019-10-13 21:29:20,261 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 21:29:20,295 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-10-13 21:29:20,296 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-13 21:29:20,451 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 21:29:20,462 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 21:29:20,478 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 21:29:20,490 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 21:29:20,492 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 21:29:20,495 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 21:29:20,503 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 21:29:20,526 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-10-13 21:29:20,526 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleAbstractInterpretation [987458732] [2019-10-13 21:29:20,526 INFO L211 CegarAbsIntRunner]: Running AI on error trace of length 146 [2019-10-13 21:29:20,528 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-10-13 21:29:20,528 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-10-13 21:29:20,543 INFO L266 AbstractInterpreter]: Error location(s) were unreachable [2019-10-13 21:29:20,544 INFO L272 AbstractInterpreter]: Visited 55 different actions 55 times. Never merged. Never widened. Performed 335 root evaluator evaluations with a maximum evaluation depth of 3. Performed 335 inverse root evaluator evaluations with a maximum inverse evaluation depth of 3. Never found a fixpoint. Largest state had 47 variables. [2019-10-13 21:29:20,544 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 21:29:20,544 INFO L536 sIntCurrentIteration]: Generating AbsInt predicates [2019-10-13 21:29:20,575 INFO L227 lantSequenceWeakener]: Weakened 48 states. On average, predicates are now at 73.9% of their original sizes. [2019-10-13 21:29:20,575 INFO L551 sIntCurrentIteration]: Unifying AI predicates [2019-10-13 21:29:20,785 INFO L553 sIntCurrentIteration]: We unified 144 AI predicates to 144 [2019-10-13 21:29:20,785 INFO L562 sIntCurrentIteration]: Finished generation of AbsInt predicates [2019-10-13 21:29:20,786 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 3 imperfect interpolant sequences. [2019-10-13 21:29:20,786 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [10, 5, 5] total 31 [2019-10-13 21:29:20,786 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2118411399] [2019-10-13 21:29:20,787 INFO L442 AbstractCegarLoop]: Interpolant automaton has 20 states [2019-10-13 21:29:20,788 INFO L137 tionRefinementEngine]: Using predicate unifier AbsIntPredicateUnifier provided by strategy TAIPAN [2019-10-13 21:29:20,788 INFO L124 tionRefinementEngine]: Using hoare triple checker CachingHoareTripleCheckerMap provided by strategy [2019-10-13 21:29:20,788 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2019-10-13 21:29:20,789 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=334, Unknown=0, NotChecked=0, Total=380 [2019-10-13 21:29:20,789 INFO L87 Difference]: Start difference. First operand 165 states and 209 transitions. Second operand 20 states. [2019-10-13 21:29:22,970 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 21:29:22,970 INFO L93 Difference]: Finished difference Result 296 states and 389 transitions. [2019-10-13 21:29:22,971 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-10-13 21:29:22,971 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 145 [2019-10-13 21:29:22,971 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 21:29:22,972 INFO L225 Difference]: With dead ends: 296 [2019-10-13 21:29:22,972 INFO L226 Difference]: Without dead ends: 180 [2019-10-13 21:29:22,973 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 126 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=46, Invalid=334, Unknown=0, NotChecked=0, Total=380 [2019-10-13 21:29:22,974 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2019-10-13 21:29:22,983 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 180. [2019-10-13 21:29:22,983 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 180 states. [2019-10-13 21:29:22,984 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 223 transitions. [2019-10-13 21:29:22,984 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 223 transitions. Word has length 145 [2019-10-13 21:29:22,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 21:29:22,985 INFO L462 AbstractCegarLoop]: Abstraction has 180 states and 223 transitions. [2019-10-13 21:29:22,985 INFO L463 AbstractCegarLoop]: Interpolant automaton has 20 states. [2019-10-13 21:29:22,985 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 223 transitions. [2019-10-13 21:29:22,987 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2019-10-13 21:29:22,987 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 21:29:22,987 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 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] [2019-10-13 21:29:23,200 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 21:29:23,201 INFO L410 AbstractCegarLoop]: === Iteration 9 === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 21:29:23,201 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 21:29:23,202 INFO L82 PathProgramCache]: Analyzing trace with hash 761382762, now seen corresponding path program 1 times [2019-10-13 21:29:23,202 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-13 21:29:23,202 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [818307451] [2019-10-13 21:29:23,203 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 21:29:23,203 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 21:29:23,203 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 21:29:23,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 21:29:23,267 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2019-10-13 21:29:23,267 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [818307451] [2019-10-13 21:29:23,267 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [601995541] [2019-10-13 21:29:23,268 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 21:29:23,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 21:29:23,456 INFO L256 TraceCheckSpWp]: Trace formula consists of 959 conjuncts, 10 conjunts are in the unsatisfiable core [2019-10-13 21:29:23,459 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 21:29:23,494 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-10-13 21:29:23,494 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-13 21:29:23,695 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 21:29:23,708 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 21:29:23,720 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 21:29:23,731 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 21:29:23,746 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 21:29:23,769 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 21:29:23,771 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 21:29:23,779 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 21:29:23,781 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 21:29:23,804 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-10-13 21:29:23,805 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleAbstractInterpretation [414373782] [2019-10-13 21:29:23,805 INFO L211 CegarAbsIntRunner]: Running AI on error trace of length 146 [2019-10-13 21:29:23,807 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-10-13 21:29:23,807 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-10-13 21:29:23,825 INFO L266 AbstractInterpreter]: Error location(s) were unreachable [2019-10-13 21:29:23,825 INFO L272 AbstractInterpreter]: Visited 74 different actions 74 times. Never merged. Never widened. Performed 415 root evaluator evaluations with a maximum evaluation depth of 3. Performed 415 inverse root evaluator evaluations with a maximum inverse evaluation depth of 3. Never found a fixpoint. Largest state had 47 variables. [2019-10-13 21:29:23,825 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 21:29:23,825 INFO L536 sIntCurrentIteration]: Generating AbsInt predicates [2019-10-13 21:29:23,864 INFO L227 lantSequenceWeakener]: Weakened 66 states. On average, predicates are now at 73.92% of their original sizes. [2019-10-13 21:29:23,865 INFO L551 sIntCurrentIteration]: Unifying AI predicates [2019-10-13 21:29:24,228 INFO L553 sIntCurrentIteration]: We unified 144 AI predicates to 144 [2019-10-13 21:29:24,228 INFO L562 sIntCurrentIteration]: Finished generation of AbsInt predicates [2019-10-13 21:29:24,229 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 3 imperfect interpolant sequences. [2019-10-13 21:29:24,229 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [5, 5, 5] total 34 [2019-10-13 21:29:24,229 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2128880079] [2019-10-13 21:29:24,230 INFO L442 AbstractCegarLoop]: Interpolant automaton has 27 states [2019-10-13 21:29:24,230 INFO L137 tionRefinementEngine]: Using predicate unifier AbsIntPredicateUnifier provided by strategy TAIPAN [2019-10-13 21:29:24,231 INFO L124 tionRefinementEngine]: Using hoare triple checker CachingHoareTripleCheckerMap provided by strategy [2019-10-13 21:29:24,231 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2019-10-13 21:29:24,231 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=637, Unknown=0, NotChecked=0, Total=702 [2019-10-13 21:29:24,232 INFO L87 Difference]: Start difference. First operand 180 states and 223 transitions. Second operand 27 states. [2019-10-13 21:29:26,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 21:29:26,674 INFO L93 Difference]: Finished difference Result 300 states and 388 transitions. [2019-10-13 21:29:26,674 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2019-10-13 21:29:26,675 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 145 [2019-10-13 21:29:26,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 21:29:26,677 INFO L225 Difference]: With dead ends: 300 [2019-10-13 21:29:26,677 INFO L226 Difference]: Without dead ends: 182 [2019-10-13 21:29:26,678 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 119 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 170 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=75, Invalid=737, Unknown=0, NotChecked=0, Total=812 [2019-10-13 21:29:26,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2019-10-13 21:29:26,686 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 182. [2019-10-13 21:29:26,686 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 182 states. [2019-10-13 21:29:26,688 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 182 states to 182 states and 224 transitions. [2019-10-13 21:29:26,688 INFO L78 Accepts]: Start accepts. Automaton has 182 states and 224 transitions. Word has length 145 [2019-10-13 21:29:26,688 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 21:29:26,688 INFO L462 AbstractCegarLoop]: Abstraction has 182 states and 224 transitions. [2019-10-13 21:29:26,689 INFO L463 AbstractCegarLoop]: Interpolant automaton has 27 states. [2019-10-13 21:29:26,689 INFO L276 IsEmpty]: Start isEmpty. Operand 182 states and 224 transitions. [2019-10-13 21:29:26,690 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2019-10-13 21:29:26,690 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 21:29:26,691 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 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] [2019-10-13 21:29:26,895 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 21:29:26,896 INFO L410 AbstractCegarLoop]: === Iteration 10 === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 21:29:26,896 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 21:29:26,896 INFO L82 PathProgramCache]: Analyzing trace with hash -77650900, now seen corresponding path program 1 times [2019-10-13 21:29:26,896 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-13 21:29:26,897 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [738281241] [2019-10-13 21:29:26,897 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 21:29:26,898 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 21:29:26,898 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 21:29:26,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 21:29:27,062 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-10-13 21:29:27,062 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [738281241] [2019-10-13 21:29:27,063 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [332066106] [2019-10-13 21:29:27,063 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 21:29:27,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 21:29:27,296 INFO L256 TraceCheckSpWp]: Trace formula consists of 962 conjuncts, 10 conjunts are in the unsatisfiable core [2019-10-13 21:29:27,299 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 21:29:27,344 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-10-13 21:29:27,344 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-13 21:29:27,530 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 21:29:27,543 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 21:29:27,554 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 21:29:27,565 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 21:29:27,583 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 21:29:27,601 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 21:29:27,603 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 21:29:27,607 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 21:29:27,608 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 21:29:27,629 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-10-13 21:29:27,629 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleAbstractInterpretation [1452324707] [2019-10-13 21:29:27,630 INFO L211 CegarAbsIntRunner]: Running AI on error trace of length 146 [2019-10-13 21:29:27,631 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-10-13 21:29:27,631 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-10-13 21:29:27,647 INFO L266 AbstractInterpreter]: Error location(s) were unreachable [2019-10-13 21:29:27,648 INFO L272 AbstractInterpreter]: Visited 77 different actions 77 times. Never merged. Never widened. Performed 420 root evaluator evaluations with a maximum evaluation depth of 3. Performed 420 inverse root evaluator evaluations with a maximum inverse evaluation depth of 3. Never found a fixpoint. Largest state had 47 variables. [2019-10-13 21:29:27,648 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 21:29:27,648 INFO L536 sIntCurrentIteration]: Generating AbsInt predicates [2019-10-13 21:29:27,687 INFO L227 lantSequenceWeakener]: Weakened 68 states. On average, predicates are now at 73.89% of their original sizes. [2019-10-13 21:29:27,687 INFO L551 sIntCurrentIteration]: Unifying AI predicates [2019-10-13 21:29:28,133 INFO L553 sIntCurrentIteration]: We unified 144 AI predicates to 144 [2019-10-13 21:29:28,133 INFO L562 sIntCurrentIteration]: Finished generation of AbsInt predicates [2019-10-13 21:29:28,133 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 3 imperfect interpolant sequences. [2019-10-13 21:29:28,134 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [8, 5, 5] total 39 [2019-10-13 21:29:28,134 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [45506951] [2019-10-13 21:29:28,135 INFO L442 AbstractCegarLoop]: Interpolant automaton has 29 states [2019-10-13 21:29:28,135 INFO L137 tionRefinementEngine]: Using predicate unifier AbsIntPredicateUnifier provided by strategy TAIPAN [2019-10-13 21:29:28,135 INFO L124 tionRefinementEngine]: Using hoare triple checker CachingHoareTripleCheckerMap provided by strategy [2019-10-13 21:29:28,135 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2019-10-13 21:29:28,136 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=743, Unknown=0, NotChecked=0, Total=812 [2019-10-13 21:29:28,136 INFO L87 Difference]: Start difference. First operand 182 states and 224 transitions. Second operand 29 states. [2019-10-13 21:29:32,004 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 21:29:32,005 INFO L93 Difference]: Finished difference Result 368 states and 490 transitions. [2019-10-13 21:29:32,005 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2019-10-13 21:29:32,005 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 145 [2019-10-13 21:29:32,005 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 21:29:32,008 INFO L225 Difference]: With dead ends: 368 [2019-10-13 21:29:32,008 INFO L226 Difference]: Without dead ends: 251 [2019-10-13 21:29:32,009 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 117 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 198 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=79, Invalid=851, Unknown=0, NotChecked=0, Total=930 [2019-10-13 21:29:32,010 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 251 states. [2019-10-13 21:29:32,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 251 to 251. [2019-10-13 21:29:32,023 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 251 states. [2019-10-13 21:29:32,024 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 251 states to 251 states and 299 transitions. [2019-10-13 21:29:32,024 INFO L78 Accepts]: Start accepts. Automaton has 251 states and 299 transitions. Word has length 145 [2019-10-13 21:29:32,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 21:29:32,025 INFO L462 AbstractCegarLoop]: Abstraction has 251 states and 299 transitions. [2019-10-13 21:29:32,025 INFO L463 AbstractCegarLoop]: Interpolant automaton has 29 states. [2019-10-13 21:29:32,025 INFO L276 IsEmpty]: Start isEmpty. Operand 251 states and 299 transitions. [2019-10-13 21:29:32,026 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 167 [2019-10-13 21:29:32,027 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 21:29:32,027 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 21:29:32,234 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 21:29:32,235 INFO L410 AbstractCegarLoop]: === Iteration 11 === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 21:29:32,236 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 21:29:32,236 INFO L82 PathProgramCache]: Analyzing trace with hash 1987498830, now seen corresponding path program 1 times [2019-10-13 21:29:32,236 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-13 21:29:32,237 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2116927225] [2019-10-13 21:29:32,237 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 21:29:32,237 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 21:29:32,238 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 21:29:32,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 21:29:32,345 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2019-10-13 21:29:32,346 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2116927225] [2019-10-13 21:29:32,346 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [511583313] [2019-10-13 21:29:32,346 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 21:29:32,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 21:29:32,587 INFO L256 TraceCheckSpWp]: Trace formula consists of 1025 conjuncts, 2 conjunts are in the unsatisfiable core [2019-10-13 21:29:32,590 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 21:29:32,617 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 46 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2019-10-13 21:29:32,617 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-13 21:29:32,745 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2019-10-13 21:29:32,747 INFO L223 tionRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2019-10-13 21:29:32,747 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [6] total 7 [2019-10-13 21:29:32,747 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [936502528] [2019-10-13 21:29:32,749 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-13 21:29:32,750 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-10-13 21:29:32,750 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-13 21:29:32,750 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2019-10-13 21:29:32,750 INFO L87 Difference]: Start difference. First operand 251 states and 299 transitions. Second operand 3 states. [2019-10-13 21:29:32,790 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 21:29:32,790 INFO L93 Difference]: Finished difference Result 372 states and 468 transitions. [2019-10-13 21:29:32,790 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-13 21:29:32,791 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 166 [2019-10-13 21:29:32,791 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 21:29:32,793 INFO L225 Difference]: With dead ends: 372 [2019-10-13 21:29:32,793 INFO L226 Difference]: Without dead ends: 258 [2019-10-13 21:29:32,794 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 337 GetRequests, 331 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2019-10-13 21:29:32,795 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 258 states. [2019-10-13 21:29:32,815 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 258 to 254. [2019-10-13 21:29:32,815 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 254 states. [2019-10-13 21:29:32,817 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 254 states to 254 states and 302 transitions. [2019-10-13 21:29:32,819 INFO L78 Accepts]: Start accepts. Automaton has 254 states and 302 transitions. Word has length 166 [2019-10-13 21:29:32,820 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 21:29:32,820 INFO L462 AbstractCegarLoop]: Abstraction has 254 states and 302 transitions. [2019-10-13 21:29:32,821 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-13 21:29:32,821 INFO L276 IsEmpty]: Start isEmpty. Operand 254 states and 302 transitions. [2019-10-13 21:29:32,824 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2019-10-13 21:29:32,824 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 21:29:32,824 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 21:29:33,029 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 21:29:33,030 INFO L410 AbstractCegarLoop]: === Iteration 12 === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 21:29:33,030 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 21:29:33,030 INFO L82 PathProgramCache]: Analyzing trace with hash -1822871901, now seen corresponding path program 1 times [2019-10-13 21:29:33,030 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-13 21:29:33,031 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1997803947] [2019-10-13 21:29:33,031 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 21:29:33,031 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 21:29:33,032 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 21:29:33,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 21:29:33,128 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2019-10-13 21:29:33,128 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1997803947] [2019-10-13 21:29:33,129 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2120875860] [2019-10-13 21:29:33,129 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 21:29:33,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 21:29:33,376 INFO L256 TraceCheckSpWp]: Trace formula consists of 1025 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-13 21:29:33,380 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 21:29:33,403 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 46 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2019-10-13 21:29:33,403 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-13 21:29:33,511 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2019-10-13 21:29:33,511 INFO L223 tionRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2019-10-13 21:29:33,511 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [6] total 7 [2019-10-13 21:29:33,512 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1977618460] [2019-10-13 21:29:33,512 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-13 21:29:33,512 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-10-13 21:29:33,513 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-13 21:29:33,513 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2019-10-13 21:29:33,513 INFO L87 Difference]: Start difference. First operand 254 states and 302 transitions. Second operand 3 states. [2019-10-13 21:29:33,535 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 21:29:33,536 INFO L93 Difference]: Finished difference Result 374 states and 466 transitions. [2019-10-13 21:29:33,536 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-13 21:29:33,536 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 167 [2019-10-13 21:29:33,537 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 21:29:33,538 INFO L225 Difference]: With dead ends: 374 [2019-10-13 21:29:33,538 INFO L226 Difference]: Without dead ends: 257 [2019-10-13 21:29:33,539 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 339 GetRequests, 334 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2019-10-13 21:29:33,540 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 257 states. [2019-10-13 21:29:33,554 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 257 to 254. [2019-10-13 21:29:33,554 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 254 states. [2019-10-13 21:29:33,556 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 254 states to 254 states and 299 transitions. [2019-10-13 21:29:33,556 INFO L78 Accepts]: Start accepts. Automaton has 254 states and 299 transitions. Word has length 167 [2019-10-13 21:29:33,556 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 21:29:33,556 INFO L462 AbstractCegarLoop]: Abstraction has 254 states and 299 transitions. [2019-10-13 21:29:33,556 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-13 21:29:33,557 INFO L276 IsEmpty]: Start isEmpty. Operand 254 states and 299 transitions. [2019-10-13 21:29:33,558 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2019-10-13 21:29:33,558 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 21:29:33,558 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 21:29:33,763 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 21:29:33,763 INFO L410 AbstractCegarLoop]: === Iteration 13 === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 21:29:33,764 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 21:29:33,764 INFO L82 PathProgramCache]: Analyzing trace with hash -1595624526, now seen corresponding path program 1 times [2019-10-13 21:29:33,765 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-13 21:29:33,765 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [568084597] [2019-10-13 21:29:33,765 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 21:29:33,765 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 21:29:33,766 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 21:29:33,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 21:29:33,937 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2019-10-13 21:29:33,937 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [568084597] [2019-10-13 21:29:33,938 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1918520470] [2019-10-13 21:29:33,938 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 21:29:34,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 21:29:34,293 INFO L256 TraceCheckSpWp]: Trace formula consists of 1025 conjuncts, 2 conjunts are in the unsatisfiable core [2019-10-13 21:29:34,297 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 21:29:34,351 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 48 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-10-13 21:29:34,351 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-13 21:29:34,592 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 7 proven. 3 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2019-10-13 21:29:34,593 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2019-10-13 21:29:34,593 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6, 4] total 9 [2019-10-13 21:29:34,593 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1871992064] [2019-10-13 21:29:34,597 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-13 21:29:34,597 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-10-13 21:29:34,597 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-13 21:29:34,598 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2019-10-13 21:29:34,598 INFO L87 Difference]: Start difference. First operand 254 states and 299 transitions. Second operand 3 states. [2019-10-13 21:29:34,633 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 21:29:34,633 INFO L93 Difference]: Finished difference Result 469 states and 590 transitions. [2019-10-13 21:29:34,634 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-13 21:29:34,634 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 167 [2019-10-13 21:29:34,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 21:29:34,638 INFO L225 Difference]: With dead ends: 469 [2019-10-13 21:29:34,638 INFO L226 Difference]: Without dead ends: 352 [2019-10-13 21:29:34,639 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 339 GetRequests, 331 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2019-10-13 21:29:34,641 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 352 states. [2019-10-13 21:29:34,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 352 to 346. [2019-10-13 21:29:34,669 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 346 states. [2019-10-13 21:29:34,672 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 346 states to 346 states and 422 transitions. [2019-10-13 21:29:34,673 INFO L78 Accepts]: Start accepts. Automaton has 346 states and 422 transitions. Word has length 167 [2019-10-13 21:29:34,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 21:29:34,674 INFO L462 AbstractCegarLoop]: Abstraction has 346 states and 422 transitions. [2019-10-13 21:29:34,674 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-13 21:29:34,674 INFO L276 IsEmpty]: Start isEmpty. Operand 346 states and 422 transitions. [2019-10-13 21:29:34,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2019-10-13 21:29:34,676 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 21:29:34,677 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 21:29:34,884 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 21:29:34,885 INFO L410 AbstractCegarLoop]: === Iteration 14 === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 21:29:34,885 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 21:29:34,885 INFO L82 PathProgramCache]: Analyzing trace with hash 1967375344, now seen corresponding path program 1 times [2019-10-13 21:29:34,885 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-13 21:29:34,886 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1851738953] [2019-10-13 21:29:34,886 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 21:29:34,886 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 21:29:34,887 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 21:29:34,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 21:29:35,003 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2019-10-13 21:29:35,004 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1851738953] [2019-10-13 21:29:35,004 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [810387131] [2019-10-13 21:29:35,004 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 21:29:35,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 21:29:35,386 INFO L256 TraceCheckSpWp]: Trace formula consists of 1024 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-13 21:29:35,397 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 21:29:35,485 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 46 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2019-10-13 21:29:35,486 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-13 21:29:35,818 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2019-10-13 21:29:35,819 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2019-10-13 21:29:35,819 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6, 6] total 9 [2019-10-13 21:29:35,820 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [166273658] [2019-10-13 21:29:35,822 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-13 21:29:35,822 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-10-13 21:29:35,823 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-13 21:29:35,823 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2019-10-13 21:29:35,823 INFO L87 Difference]: Start difference. First operand 346 states and 422 transitions. Second operand 4 states. [2019-10-13 21:29:35,975 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 21:29:35,975 INFO L93 Difference]: Finished difference Result 555 states and 703 transitions. [2019-10-13 21:29:35,976 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-13 21:29:35,976 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 167 [2019-10-13 21:29:35,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 21:29:35,981 INFO L225 Difference]: With dead ends: 555 [2019-10-13 21:29:35,981 INFO L226 Difference]: Without dead ends: 346 [2019-10-13 21:29:35,983 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 339 GetRequests, 318 SyntacticMatches, 14 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2019-10-13 21:29:35,984 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 346 states. [2019-10-13 21:29:36,013 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 346 to 346. [2019-10-13 21:29:36,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 346 states. [2019-10-13 21:29:36,016 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 346 states to 346 states and 421 transitions. [2019-10-13 21:29:36,016 INFO L78 Accepts]: Start accepts. Automaton has 346 states and 421 transitions. Word has length 167 [2019-10-13 21:29:36,017 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 21:29:36,017 INFO L462 AbstractCegarLoop]: Abstraction has 346 states and 421 transitions. [2019-10-13 21:29:36,017 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-13 21:29:36,018 INFO L276 IsEmpty]: Start isEmpty. Operand 346 states and 421 transitions. [2019-10-13 21:29:36,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 169 [2019-10-13 21:29:36,020 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 21:29:36,020 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 21:29:36,227 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 21:29:36,228 INFO L410 AbstractCegarLoop]: === Iteration 15 === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 21:29:36,228 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 21:29:36,228 INFO L82 PathProgramCache]: Analyzing trace with hash -563979487, now seen corresponding path program 1 times [2019-10-13 21:29:36,229 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-13 21:29:36,229 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1016978827] [2019-10-13 21:29:36,229 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 21:29:36,230 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 21:29:36,230 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 21:29:36,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 21:29:36,474 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 4 proven. 13 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2019-10-13 21:29:36,474 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1016978827] [2019-10-13 21:29:36,475 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [379142950] [2019-10-13 21:29:36,475 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 21:29:36,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 21:29:36,873 INFO L256 TraceCheckSpWp]: Trace formula consists of 1024 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-13 21:29:36,880 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 21:29:36,926 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 46 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2019-10-13 21:29:36,927 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-13 21:29:37,115 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2019-10-13 21:29:37,116 INFO L223 tionRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2019-10-13 21:29:37,117 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [11] total 12 [2019-10-13 21:29:37,117 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [436467378] [2019-10-13 21:29:37,119 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-13 21:29:37,119 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-10-13 21:29:37,119 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-13 21:29:37,120 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=108, Unknown=0, NotChecked=0, Total=132 [2019-10-13 21:29:37,120 INFO L87 Difference]: Start difference. First operand 346 states and 421 transitions. Second operand 3 states. [2019-10-13 21:29:37,157 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 21:29:37,157 INFO L93 Difference]: Finished difference Result 568 states and 719 transitions. [2019-10-13 21:29:37,157 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-13 21:29:37,158 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 168 [2019-10-13 21:29:37,158 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 21:29:37,161 INFO L225 Difference]: With dead ends: 568 [2019-10-13 21:29:37,161 INFO L226 Difference]: Without dead ends: 359 [2019-10-13 21:29:37,164 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 346 GetRequests, 336 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=24, Invalid=108, Unknown=0, NotChecked=0, Total=132 [2019-10-13 21:29:37,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 359 states. [2019-10-13 21:29:37,195 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 359 to 353. [2019-10-13 21:29:37,196 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 353 states. [2019-10-13 21:29:37,198 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 353 states to 353 states and 430 transitions. [2019-10-13 21:29:37,198 INFO L78 Accepts]: Start accepts. Automaton has 353 states and 430 transitions. Word has length 168 [2019-10-13 21:29:37,199 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 21:29:37,199 INFO L462 AbstractCegarLoop]: Abstraction has 353 states and 430 transitions. [2019-10-13 21:29:37,199 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-13 21:29:37,199 INFO L276 IsEmpty]: Start isEmpty. Operand 353 states and 430 transitions. [2019-10-13 21:29:37,201 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 169 [2019-10-13 21:29:37,201 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 21:29:37,202 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 21:29:37,409 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 21:29:37,409 INFO L410 AbstractCegarLoop]: === Iteration 16 === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 21:29:37,410 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 21:29:37,410 INFO L82 PathProgramCache]: Analyzing trace with hash 275054175, now seen corresponding path program 1 times [2019-10-13 21:29:37,410 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-13 21:29:37,410 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1926229111] [2019-10-13 21:29:37,411 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 21:29:37,411 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 21:29:37,411 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 21:29:37,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 21:29:37,529 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2019-10-13 21:29:37,530 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1926229111] [2019-10-13 21:29:37,530 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1559944077] [2019-10-13 21:29:37,530 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 21:29:37,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 21:29:37,946 INFO L256 TraceCheckSpWp]: Trace formula consists of 1025 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-13 21:29:37,960 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 21:29:38,060 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 46 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2019-10-13 21:29:38,060 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-13 21:29:38,433 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 4 proven. 4 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2019-10-13 21:29:38,434 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2019-10-13 21:29:38,434 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6, 6] total 11 [2019-10-13 21:29:38,434 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1437280639] [2019-10-13 21:29:38,435 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-13 21:29:38,435 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-10-13 21:29:38,436 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-13 21:29:38,436 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2019-10-13 21:29:38,436 INFO L87 Difference]: Start difference. First operand 353 states and 430 transitions. Second operand 4 states. [2019-10-13 21:29:38,555 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 21:29:38,555 INFO L93 Difference]: Finished difference Result 569 states and 719 transitions. [2019-10-13 21:29:38,556 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-13 21:29:38,556 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 168 [2019-10-13 21:29:38,557 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 21:29:38,560 INFO L225 Difference]: With dead ends: 569 [2019-10-13 21:29:38,560 INFO L226 Difference]: Without dead ends: 353 [2019-10-13 21:29:38,562 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 341 GetRequests, 321 SyntacticMatches, 11 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2019-10-13 21:29:38,563 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 353 states. [2019-10-13 21:29:38,588 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 353 to 353. [2019-10-13 21:29:38,588 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 353 states. [2019-10-13 21:29:38,591 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 353 states to 353 states and 428 transitions. [2019-10-13 21:29:38,591 INFO L78 Accepts]: Start accepts. Automaton has 353 states and 428 transitions. Word has length 168 [2019-10-13 21:29:38,594 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 21:29:38,594 INFO L462 AbstractCegarLoop]: Abstraction has 353 states and 428 transitions. [2019-10-13 21:29:38,594 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-13 21:29:38,595 INFO L276 IsEmpty]: Start isEmpty. Operand 353 states and 428 transitions. [2019-10-13 21:29:38,596 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 170 [2019-10-13 21:29:38,597 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 21:29:38,597 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 21:29:38,804 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 21:29:38,804 INFO L410 AbstractCegarLoop]: === Iteration 17 === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 21:29:38,804 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 21:29:38,805 INFO L82 PathProgramCache]: Analyzing trace with hash -1085283410, now seen corresponding path program 1 times [2019-10-13 21:29:38,805 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-13 21:29:38,805 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1806914010] [2019-10-13 21:29:38,805 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 21:29:38,805 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 21:29:38,806 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 21:29:38,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 21:29:38,878 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2019-10-13 21:29:38,878 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1806914010] [2019-10-13 21:29:38,880 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1552009015] [2019-10-13 21:29:38,880 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 21:29:39,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 21:29:39,156 INFO L256 TraceCheckSpWp]: Trace formula consists of 1026 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-13 21:29:39,160 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 21:29:39,232 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 46 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2019-10-13 21:29:39,232 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-13 21:29:39,530 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2019-10-13 21:29:39,531 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2019-10-13 21:29:39,531 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6, 6] total 11 [2019-10-13 21:29:39,531 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [443036135] [2019-10-13 21:29:39,532 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-13 21:29:39,532 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-10-13 21:29:39,533 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-13 21:29:39,533 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2019-10-13 21:29:39,533 INFO L87 Difference]: Start difference. First operand 353 states and 428 transitions. Second operand 4 states. [2019-10-13 21:29:39,644 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 21:29:39,645 INFO L93 Difference]: Finished difference Result 562 states and 707 transitions. [2019-10-13 21:29:39,645 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-13 21:29:39,645 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 169 [2019-10-13 21:29:39,645 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 21:29:39,647 INFO L225 Difference]: With dead ends: 562 [2019-10-13 21:29:39,647 INFO L226 Difference]: Without dead ends: 346 [2019-10-13 21:29:39,648 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 343 GetRequests, 322 SyntacticMatches, 12 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2019-10-13 21:29:39,649 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 346 states. [2019-10-13 21:29:39,669 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 346 to 346. [2019-10-13 21:29:39,669 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 346 states. [2019-10-13 21:29:39,672 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 346 states to 346 states and 418 transitions. [2019-10-13 21:29:39,672 INFO L78 Accepts]: Start accepts. Automaton has 346 states and 418 transitions. Word has length 169 [2019-10-13 21:29:39,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 21:29:39,673 INFO L462 AbstractCegarLoop]: Abstraction has 346 states and 418 transitions. [2019-10-13 21:29:39,673 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-13 21:29:39,673 INFO L276 IsEmpty]: Start isEmpty. Operand 346 states and 418 transitions. [2019-10-13 21:29:39,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 171 [2019-10-13 21:29:39,675 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 21:29:39,676 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 21:29:39,883 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 21:29:39,883 INFO L410 AbstractCegarLoop]: === Iteration 18 === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 21:29:39,884 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 21:29:39,884 INFO L82 PathProgramCache]: Analyzing trace with hash 1095697343, now seen corresponding path program 1 times [2019-10-13 21:29:39,884 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-13 21:29:39,885 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [448132687] [2019-10-13 21:29:39,885 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 21:29:39,885 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 21:29:39,885 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 21:29:39,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 21:29:39,965 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2019-10-13 21:29:39,966 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [448132687] [2019-10-13 21:29:39,966 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-13 21:29:39,966 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-10-13 21:29:39,966 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [428518856] [2019-10-13 21:29:39,967 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-10-13 21:29:39,968 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-10-13 21:29:39,968 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-10-13 21:29:39,968 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-10-13 21:29:39,969 INFO L87 Difference]: Start difference. First operand 346 states and 418 transitions. Second operand 5 states. [2019-10-13 21:29:40,396 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 21:29:40,397 INFO L93 Difference]: Finished difference Result 623 states and 775 transitions. [2019-10-13 21:29:40,397 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-10-13 21:29:40,397 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 170 [2019-10-13 21:29:40,398 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 21:29:40,399 INFO L225 Difference]: With dead ends: 623 [2019-10-13 21:29:40,400 INFO L226 Difference]: Without dead ends: 414 [2019-10-13 21:29:40,400 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2019-10-13 21:29:40,401 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 414 states. [2019-10-13 21:29:40,422 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 414 to 412. [2019-10-13 21:29:40,422 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 412 states.