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 0.1.24-13a467a-m [2019-10-15 01:28:09,441 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-15 01:28:09,444 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-15 01:28:09,464 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-15 01:28:09,464 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-15 01:28:09,466 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-15 01:28:09,468 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-15 01:28:09,479 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-15 01:28:09,483 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-15 01:28:09,487 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-15 01:28:09,488 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-15 01:28:09,489 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-15 01:28:09,489 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-15 01:28:09,490 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-15 01:28:09,491 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-15 01:28:09,492 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-15 01:28:09,493 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-15 01:28:09,494 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-15 01:28:09,498 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-15 01:28:09,499 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-15 01:28:09,501 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-15 01:28:09,504 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-15 01:28:09,507 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-15 01:28:09,508 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-15 01:28:09,512 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-10-15 01:28:09,512 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-10-15 01:28:09,512 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-10-15 01:28:09,514 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-10-15 01:28:09,515 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-10-15 01:28:09,518 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-10-15 01:28:09,518 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-10-15 01:28:09,519 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-10-15 01:28:09,520 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-10-15 01:28:09,521 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-10-15 01:28:09,525 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-10-15 01:28:09,525 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-10-15 01:28:09,526 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-10-15 01:28:09,526 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-10-15 01:28:09,526 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-15 01:28:09,527 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-15 01:28:09,528 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-15 01:28:09,529 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 [2019-10-15 01:28:09,572 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-15 01:28:09,573 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-15 01:28:09,577 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-15 01:28:09,577 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-15 01:28:09,577 INFO L138 SettingsManager]: * Use SBE=true [2019-10-15 01:28:09,577 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-15 01:28:09,577 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-15 01:28:09,578 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-15 01:28:09,578 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-15 01:28:09,578 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-15 01:28:09,578 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-15 01:28:09,578 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-15 01:28:09,578 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-15 01:28:09,579 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-15 01:28:09,579 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-15 01:28:09,579 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-15 01:28:09,579 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-15 01:28:09,580 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-15 01:28:09,580 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-15 01:28:09,580 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-15 01:28:09,580 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-15 01:28:09,580 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-15 01:28:09,581 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-15 01:28:09,581 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-15 01:28:09,581 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-15 01:28:09,581 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-15 01:28:09,581 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-15 01:28:09,582 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-15 01:28:09,582 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 [2019-10-15 01:28:09,879 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-15 01:28:09,896 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-15 01:28:09,901 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-15 01:28:09,903 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-15 01:28:09,903 INFO L275 PluginConnector]: CDTParser initialized [2019-10-15 01:28:09,904 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/systemc/bist_cell.cil.c [2019-10-15 01:28:09,980 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/31478115c/cceec51c22ee4d3cb95837427a7f6808/FLAG42ac8119e [2019-10-15 01:28:10,465 INFO L306 CDTParser]: Found 1 translation units. [2019-10-15 01:28:10,465 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/systemc/bist_cell.cil.c [2019-10-15 01:28:10,475 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/31478115c/cceec51c22ee4d3cb95837427a7f6808/FLAG42ac8119e [2019-10-15 01:28:10,825 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/31478115c/cceec51c22ee4d3cb95837427a7f6808 [2019-10-15 01:28:10,838 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-15 01:28:10,840 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-15 01:28:10,841 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-15 01:28:10,841 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-15 01:28:10,845 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-15 01:28:10,846 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 01:28:10" (1/1) ... [2019-10-15 01:28:10,849 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2347579a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:28:10, skipping insertion in model container [2019-10-15 01:28:10,849 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 01:28:10" (1/1) ... [2019-10-15 01:28:10,857 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-15 01:28:10,898 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-15 01:28:11,166 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 01:28:11,176 INFO L188 MainTranslator]: Completed pre-run [2019-10-15 01:28:11,310 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 01:28:11,335 INFO L192 MainTranslator]: Completed translation [2019-10-15 01:28:11,335 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:28:11 WrapperNode [2019-10-15 01:28:11,335 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-15 01:28:11,336 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-15 01:28:11,336 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-15 01:28:11,336 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-15 01:28:11,350 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:28:11" (1/1) ... [2019-10-15 01:28:11,351 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:28:11" (1/1) ... [2019-10-15 01:28:11,361 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:28:11" (1/1) ... [2019-10-15 01:28:11,362 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:28:11" (1/1) ... [2019-10-15 01:28:11,377 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:28:11" (1/1) ... [2019-10-15 01:28:11,389 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:28:11" (1/1) ... [2019-10-15 01:28:11,392 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:28:11" (1/1) ... [2019-10-15 01:28:11,395 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-15 01:28:11,395 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-15 01:28:11,395 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-15 01:28:11,396 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-15 01:28:11,397 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:28:11" (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 [2019-10-15 01:28:11,455 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-15 01:28:11,455 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-15 01:28:11,455 INFO L138 BoogieDeclarations]: Found implementation of procedure error [2019-10-15 01:28:11,455 INFO L138 BoogieDeclarations]: Found implementation of procedure method1 [2019-10-15 01:28:11,456 INFO L138 BoogieDeclarations]: Found implementation of procedure is_method1_triggered [2019-10-15 01:28:11,456 INFO L138 BoogieDeclarations]: Found implementation of procedure update_b0 [2019-10-15 01:28:11,456 INFO L138 BoogieDeclarations]: Found implementation of procedure update_b1 [2019-10-15 01:28:11,456 INFO L138 BoogieDeclarations]: Found implementation of procedure update_d0 [2019-10-15 01:28:11,456 INFO L138 BoogieDeclarations]: Found implementation of procedure update_d1 [2019-10-15 01:28:11,457 INFO L138 BoogieDeclarations]: Found implementation of procedure update_z [2019-10-15 01:28:11,457 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels [2019-10-15 01:28:11,457 INFO L138 BoogieDeclarations]: Found implementation of procedure init_threads [2019-10-15 01:28:11,457 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread [2019-10-15 01:28:11,457 INFO L138 BoogieDeclarations]: Found implementation of procedure eval [2019-10-15 01:28:11,457 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events [2019-10-15 01:28:11,458 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events [2019-10-15 01:28:11,458 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads [2019-10-15 01:28:11,458 INFO L138 BoogieDeclarations]: Found implementation of procedure stop_simulation [2019-10-15 01:28:11,458 INFO L138 BoogieDeclarations]: Found implementation of procedure start_simulation [2019-10-15 01:28:11,458 INFO L138 BoogieDeclarations]: Found implementation of procedure init_model [2019-10-15 01:28:11,459 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-15 01:28:11,459 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-15 01:28:11,459 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-10-15 01:28:11,459 INFO L130 BoogieDeclarations]: Found specification of procedure error [2019-10-15 01:28:11,459 INFO L130 BoogieDeclarations]: Found specification of procedure method1 [2019-10-15 01:28:11,460 INFO L130 BoogieDeclarations]: Found specification of procedure is_method1_triggered [2019-10-15 01:28:11,460 INFO L130 BoogieDeclarations]: Found specification of procedure update_b0 [2019-10-15 01:28:11,460 INFO L130 BoogieDeclarations]: Found specification of procedure update_b1 [2019-10-15 01:28:11,460 INFO L130 BoogieDeclarations]: Found specification of procedure update_d0 [2019-10-15 01:28:11,460 INFO L130 BoogieDeclarations]: Found specification of procedure update_d1 [2019-10-15 01:28:11,460 INFO L130 BoogieDeclarations]: Found specification of procedure update_z [2019-10-15 01:28:11,461 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels [2019-10-15 01:28:11,461 INFO L130 BoogieDeclarations]: Found specification of procedure init_threads [2019-10-15 01:28:11,461 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread [2019-10-15 01:28:11,461 INFO L130 BoogieDeclarations]: Found specification of procedure eval [2019-10-15 01:28:11,461 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events [2019-10-15 01:28:11,461 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events [2019-10-15 01:28:11,461 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads [2019-10-15 01:28:11,462 INFO L130 BoogieDeclarations]: Found specification of procedure stop_simulation [2019-10-15 01:28:11,462 INFO L130 BoogieDeclarations]: Found specification of procedure start_simulation [2019-10-15 01:28:11,462 INFO L130 BoogieDeclarations]: Found specification of procedure init_model [2019-10-15 01:28:11,462 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-15 01:28:11,462 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-15 01:28:11,462 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-15 01:28:12,053 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-15 01:28:12,053 INFO L284 CfgBuilder]: Removed 2 assume(true) statements. [2019-10-15 01:28:12,055 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 01:28:12 BoogieIcfgContainer [2019-10-15 01:28:12,055 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-15 01:28:12,056 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-15 01:28:12,056 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-15 01:28:12,060 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-15 01:28:12,060 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 15.10 01:28:10" (1/3) ... [2019-10-15 01:28:12,061 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@ffedff4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 01:28:12, skipping insertion in model container [2019-10-15 01:28:12,062 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:28:11" (2/3) ... [2019-10-15 01:28:12,062 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@ffedff4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 01:28:12, skipping insertion in model container [2019-10-15 01:28:12,062 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 01:28:12" (3/3) ... [2019-10-15 01:28:12,064 INFO L109 eAbstractionObserver]: Analyzing ICFG bist_cell.cil.c [2019-10-15 01:28:12,076 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-15 01:28:12,085 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-15 01:28:12,097 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-15 01:28:12,125 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-15 01:28:12,125 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-15 01:28:12,126 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-15 01:28:12,126 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-15 01:28:12,126 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-15 01:28:12,127 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-15 01:28:12,127 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-15 01:28:12,127 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-15 01:28:12,151 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states. [2019-10-15 01:28:12,161 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2019-10-15 01:28:12,161 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:28:12,163 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] [2019-10-15 01:28:12,165 INFO L410 AbstractCegarLoop]: === Iteration 1 === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:28:12,171 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:28:12,172 INFO L82 PathProgramCache]: Analyzing trace with hash -778963544, now seen corresponding path program 1 times [2019-10-15 01:28:12,181 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-15 01:28:12,182 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2040521376] [2019-10-15 01:28:12,182 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:28:12,182 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:28:12,183 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:28:12,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:28:12,503 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:28:12,504 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2040521376] [2019-10-15 01:28:12,505 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 01:28:12,506 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-15 01:28:12,506 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1468996891] [2019-10-15 01:28:12,511 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-15 01:28:12,513 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-10-15 01:28:12,529 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-15 01:28:12,530 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-15 01:28:12,532 INFO L87 Difference]: Start difference. First operand 141 states. Second operand 4 states. [2019-10-15 01:28:12,807 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:28:12,807 INFO L93 Difference]: Finished difference Result 265 states and 367 transitions. [2019-10-15 01:28:12,808 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-15 01:28:12,810 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 58 [2019-10-15 01:28:12,810 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:28:12,832 INFO L225 Difference]: With dead ends: 265 [2019-10-15 01:28:12,832 INFO L226 Difference]: Without dead ends: 134 [2019-10-15 01:28:12,841 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 [2019-10-15 01:28:12,865 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2019-10-15 01:28:12,931 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 134. [2019-10-15 01:28:12,932 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 134 states. [2019-10-15 01:28:12,936 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 179 transitions. [2019-10-15 01:28:12,938 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 179 transitions. Word has length 58 [2019-10-15 01:28:12,940 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:28:12,940 INFO L462 AbstractCegarLoop]: Abstraction has 134 states and 179 transitions. [2019-10-15 01:28:12,940 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-15 01:28:12,941 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 179 transitions. [2019-10-15 01:28:12,947 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2019-10-15 01:28:12,947 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:28:12,948 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] [2019-10-15 01:28:12,948 INFO L410 AbstractCegarLoop]: === Iteration 2 === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:28:12,948 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:28:12,949 INFO L82 PathProgramCache]: Analyzing trace with hash -820467770, now seen corresponding path program 1 times [2019-10-15 01:28:12,949 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-15 01:28:12,949 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1653165642] [2019-10-15 01:28:12,950 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:28:12,950 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:28:12,950 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:28:13,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:28:13,237 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-10-15 01:28:13,237 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1653165642] [2019-10-15 01:28:13,237 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2026944843] [2019-10-15 01:28:13,238 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 [2019-10-15 01:28:13,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:28:13,440 INFO L256 TraceCheckSpWp]: Trace formula consists of 867 conjuncts, 8 conjunts are in the unsatisfiable core [2019-10-15 01:28:13,454 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:28:13,562 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-10-15 01:28:13,562 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:28:13,863 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:28:13,882 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:28:13,914 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:28:13,962 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-10-15 01:28:13,963 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleAbstractInterpretation [2032839469] [2019-10-15 01:28:13,984 INFO L211 CegarAbsIntRunner]: Running AI on error trace of length 126 [2019-10-15 01:28:14,040 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-10-15 01:28:14,040 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-10-15 01:28:14,142 INFO L266 AbstractInterpreter]: Error location(s) were unreachable [2019-10-15 01:28:14,144 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. [2019-10-15 01:28:14,148 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:28:14,149 INFO L536 sIntCurrentIteration]: Generating AbsInt predicates [2019-10-15 01:28:14,272 INFO L227 lantSequenceWeakener]: Weakened 12 states. On average, predicates are now at 86.41% of their original sizes. [2019-10-15 01:28:14,272 INFO L551 sIntCurrentIteration]: Unifying AI predicates [2019-10-15 01:28:14,283 INFO L553 sIntCurrentIteration]: We unified 124 AI predicates to 124 [2019-10-15 01:28:14,284 INFO L562 sIntCurrentIteration]: Finished generation of AbsInt predicates [2019-10-15 01:28:14,284 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 3 imperfect interpolant sequences. [2019-10-15 01:28:14,285 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5, 5, 5] total 11 [2019-10-15 01:28:14,285 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [389821753] [2019-10-15 01:28:14,289 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-15 01:28:14,290 INFO L137 tionRefinementEngine]: Using predicate unifier AbsIntPredicateUnifier provided by strategy TAIPAN [2019-10-15 01:28:14,290 INFO L124 tionRefinementEngine]: Using hoare triple checker CachingHoareTripleCheckerMap provided by strategy [2019-10-15 01:28:14,291 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-15 01:28:14,291 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-15 01:28:14,294 INFO L87 Difference]: Start difference. First operand 134 states and 179 transitions. Second operand 3 states. [2019-10-15 01:28:14,562 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:28:14,562 INFO L93 Difference]: Finished difference Result 259 states and 352 transitions. [2019-10-15 01:28:14,563 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-15 01:28:14,563 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 125 [2019-10-15 01:28:14,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:28:14,565 INFO L225 Difference]: With dead ends: 259 [2019-10-15 01:28:14,566 INFO L226 Difference]: Without dead ends: 138 [2019-10-15 01:28:14,571 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 [2019-10-15 01:28:14,574 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2019-10-15 01:28:14,606 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 135. [2019-10-15 01:28:14,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 135 states. [2019-10-15 01:28:14,612 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 180 transitions. [2019-10-15 01:28:14,613 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 180 transitions. Word has length 125 [2019-10-15 01:28:14,614 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:28:14,614 INFO L462 AbstractCegarLoop]: Abstraction has 135 states and 180 transitions. [2019-10-15 01:28:14,614 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-15 01:28:14,614 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 180 transitions. [2019-10-15 01:28:14,622 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2019-10-15 01:28:14,622 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:28:14,626 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] [2019-10-15 01:28:14,833 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:28:14,834 INFO L410 AbstractCegarLoop]: === Iteration 3 === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:28:14,834 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:28:14,835 INFO L82 PathProgramCache]: Analyzing trace with hash 149420437, now seen corresponding path program 1 times [2019-10-15 01:28:14,835 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-15 01:28:14,836 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2077426874] [2019-10-15 01:28:14,836 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:28:14,836 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:28:14,836 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:28:14,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:28:15,072 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-10-15 01:28:15,073 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2077426874] [2019-10-15 01:28:15,073 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1212101803] [2019-10-15 01:28:15,074 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 [2019-10-15 01:28:15,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:28:15,279 INFO L256 TraceCheckSpWp]: Trace formula consists of 890 conjuncts, 8 conjunts are in the unsatisfiable core [2019-10-15 01:28:15,304 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:28:15,379 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-10-15 01:28:15,379 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:28:15,635 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:28:15,652 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:28:15,670 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:28:15,691 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:28:15,716 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-10-15 01:28:15,716 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleAbstractInterpretation [766464943] [2019-10-15 01:28:15,717 INFO L211 CegarAbsIntRunner]: Running AI on error trace of length 131 [2019-10-15 01:28:15,724 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-10-15 01:28:15,724 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-10-15 01:28:15,771 INFO L266 AbstractInterpreter]: Error location(s) were unreachable [2019-10-15 01:28:15,774 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. [2019-10-15 01:28:15,775 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:28:15,775 INFO L536 sIntCurrentIteration]: Generating AbsInt predicates [2019-10-15 01:28:15,855 INFO L227 lantSequenceWeakener]: Weakened 18 states. On average, predicates are now at 81.22% of their original sizes. [2019-10-15 01:28:15,856 INFO L551 sIntCurrentIteration]: Unifying AI predicates [2019-10-15 01:28:15,876 INFO L553 sIntCurrentIteration]: We unified 129 AI predicates to 129 [2019-10-15 01:28:15,876 INFO L562 sIntCurrentIteration]: Finished generation of AbsInt predicates [2019-10-15 01:28:15,877 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 3 imperfect interpolant sequences. [2019-10-15 01:28:15,877 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [10, 5, 5] total 19 [2019-10-15 01:28:15,877 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [503292696] [2019-10-15 01:28:15,878 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-10-15 01:28:15,879 INFO L137 tionRefinementEngine]: Using predicate unifier AbsIntPredicateUnifier provided by strategy TAIPAN [2019-10-15 01:28:15,879 INFO L124 tionRefinementEngine]: Using hoare triple checker CachingHoareTripleCheckerMap provided by strategy [2019-10-15 01:28:15,879 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-10-15 01:28:15,879 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2019-10-15 01:28:15,880 INFO L87 Difference]: Start difference. First operand 135 states and 180 transitions. Second operand 6 states. [2019-10-15 01:28:16,483 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:28:16,483 INFO L93 Difference]: Finished difference Result 265 states and 360 transitions. [2019-10-15 01:28:16,484 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-10-15 01:28:16,484 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 130 [2019-10-15 01:28:16,484 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:28:16,489 INFO L225 Difference]: With dead ends: 265 [2019-10-15 01:28:16,489 INFO L226 Difference]: Without dead ends: 144 [2019-10-15 01:28:16,491 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 [2019-10-15 01:28:16,491 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2019-10-15 01:28:16,503 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 141. [2019-10-15 01:28:16,503 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 141 states. [2019-10-15 01:28:16,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 186 transitions. [2019-10-15 01:28:16,505 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 186 transitions. Word has length 130 [2019-10-15 01:28:16,505 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:28:16,506 INFO L462 AbstractCegarLoop]: Abstraction has 141 states and 186 transitions. [2019-10-15 01:28:16,506 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-10-15 01:28:16,506 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 186 transitions. [2019-10-15 01:28:16,508 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2019-10-15 01:28:16,508 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:28:16,508 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] [2019-10-15 01:28:16,720 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:28:16,721 INFO L410 AbstractCegarLoop]: === Iteration 4 === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:28:16,721 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:28:16,721 INFO L82 PathProgramCache]: Analyzing trace with hash 852982624, now seen corresponding path program 1 times [2019-10-15 01:28:16,722 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-15 01:28:16,722 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1755852059] [2019-10-15 01:28:16,722 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:28:16,722 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:28:16,722 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:28:16,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:28:16,904 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-10-15 01:28:16,905 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1755852059] [2019-10-15 01:28:16,905 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1189830538] [2019-10-15 01:28:16,905 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 [2019-10-15 01:28:17,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:28:17,075 INFO L256 TraceCheckSpWp]: Trace formula consists of 913 conjuncts, 8 conjunts are in the unsatisfiable core [2019-10-15 01:28:17,081 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:28:17,170 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-10-15 01:28:17,170 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:28:17,384 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:28:17,397 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:28:17,413 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:28:17,427 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:28:17,436 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:28:17,458 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-10-15 01:28:17,459 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleAbstractInterpretation [2067637411] [2019-10-15 01:28:17,459 INFO L211 CegarAbsIntRunner]: Running AI on error trace of length 136 [2019-10-15 01:28:17,462 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-10-15 01:28:17,462 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-10-15 01:28:17,476 INFO L266 AbstractInterpreter]: Error location(s) were unreachable [2019-10-15 01:28:17,476 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. [2019-10-15 01:28:17,477 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:28:17,477 INFO L536 sIntCurrentIteration]: Generating AbsInt predicates [2019-10-15 01:28:17,511 INFO L227 lantSequenceWeakener]: Weakened 24 states. On average, predicates are now at 78.06% of their original sizes. [2019-10-15 01:28:17,511 INFO L551 sIntCurrentIteration]: Unifying AI predicates [2019-10-15 01:28:17,563 INFO L553 sIntCurrentIteration]: We unified 134 AI predicates to 134 [2019-10-15 01:28:17,563 INFO L562 sIntCurrentIteration]: Finished generation of AbsInt predicates [2019-10-15 01:28:17,563 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 3 imperfect interpolant sequences. [2019-10-15 01:28:17,564 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [10, 5, 5] total 22 [2019-10-15 01:28:17,564 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1237546956] [2019-10-15 01:28:17,565 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-10-15 01:28:17,565 INFO L137 tionRefinementEngine]: Using predicate unifier AbsIntPredicateUnifier provided by strategy TAIPAN [2019-10-15 01:28:17,565 INFO L124 tionRefinementEngine]: Using hoare triple checker CachingHoareTripleCheckerMap provided by strategy [2019-10-15 01:28:17,566 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-10-15 01:28:17,566 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2019-10-15 01:28:17,566 INFO L87 Difference]: Start difference. First operand 141 states and 186 transitions. Second operand 9 states. [2019-10-15 01:28:18,142 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:28:18,142 INFO L93 Difference]: Finished difference Result 271 states and 366 transitions. [2019-10-15 01:28:18,142 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-10-15 01:28:18,142 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 135 [2019-10-15 01:28:18,143 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:28:18,144 INFO L225 Difference]: With dead ends: 271 [2019-10-15 01:28:18,144 INFO L226 Difference]: Without dead ends: 150 [2019-10-15 01:28:18,146 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 [2019-10-15 01:28:18,146 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2019-10-15 01:28:18,158 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 147. [2019-10-15 01:28:18,158 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 147 states. [2019-10-15 01:28:18,159 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 192 transitions. [2019-10-15 01:28:18,160 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 192 transitions. Word has length 135 [2019-10-15 01:28:18,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:28:18,160 INFO L462 AbstractCegarLoop]: Abstraction has 147 states and 192 transitions. [2019-10-15 01:28:18,161 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-10-15 01:28:18,161 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 192 transitions. [2019-10-15 01:28:18,163 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2019-10-15 01:28:18,163 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:28:18,164 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] [2019-10-15 01:28:18,370 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:28:18,370 INFO L410 AbstractCegarLoop]: === Iteration 5 === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:28:18,370 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:28:18,370 INFO L82 PathProgramCache]: Analyzing trace with hash -439141822, now seen corresponding path program 1 times [2019-10-15 01:28:18,371 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-15 01:28:18,371 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [840894365] [2019-10-15 01:28:18,371 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:28:18,371 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:28:18,371 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:28:18,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:28:18,530 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-10-15 01:28:18,531 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [840894365] [2019-10-15 01:28:18,531 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [765870284] [2019-10-15 01:28:18,531 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 [2019-10-15 01:28:18,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:28:18,735 INFO L256 TraceCheckSpWp]: Trace formula consists of 936 conjuncts, 8 conjunts are in the unsatisfiable core [2019-10-15 01:28:18,746 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:28:18,799 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-10-15 01:28:18,799 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:28:18,990 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:28:19,003 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:28:19,023 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:28:19,038 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:28:19,042 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:28:19,046 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:28:19,110 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-10-15 01:28:19,110 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleAbstractInterpretation [215207767] [2019-10-15 01:28:19,111 INFO L211 CegarAbsIntRunner]: Running AI on error trace of length 141 [2019-10-15 01:28:19,120 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-10-15 01:28:19,120 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-10-15 01:28:19,134 INFO L266 AbstractInterpreter]: Error location(s) were unreachable [2019-10-15 01:28:19,134 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. [2019-10-15 01:28:19,135 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:28:19,135 INFO L536 sIntCurrentIteration]: Generating AbsInt predicates [2019-10-15 01:28:19,182 INFO L227 lantSequenceWeakener]: Weakened 30 states. On average, predicates are now at 75.71% of their original sizes. [2019-10-15 01:28:19,182 INFO L551 sIntCurrentIteration]: Unifying AI predicates [2019-10-15 01:28:19,265 INFO L553 sIntCurrentIteration]: We unified 139 AI predicates to 139 [2019-10-15 01:28:19,266 INFO L562 sIntCurrentIteration]: Finished generation of AbsInt predicates [2019-10-15 01:28:19,266 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 3 imperfect interpolant sequences. [2019-10-15 01:28:19,267 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [10, 5, 5] total 23 [2019-10-15 01:28:19,267 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1016354871] [2019-10-15 01:28:19,268 INFO L442 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-10-15 01:28:19,268 INFO L137 tionRefinementEngine]: Using predicate unifier AbsIntPredicateUnifier provided by strategy TAIPAN [2019-10-15 01:28:19,268 INFO L124 tionRefinementEngine]: Using hoare triple checker CachingHoareTripleCheckerMap provided by strategy [2019-10-15 01:28:19,268 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-10-15 01:28:19,269 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2019-10-15 01:28:19,269 INFO L87 Difference]: Start difference. First operand 147 states and 192 transitions. Second operand 12 states. [2019-10-15 01:28:19,994 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:28:19,995 INFO L93 Difference]: Finished difference Result 277 states and 372 transitions. [2019-10-15 01:28:19,995 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-10-15 01:28:19,995 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 140 [2019-10-15 01:28:19,995 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:28:19,997 INFO L225 Difference]: With dead ends: 277 [2019-10-15 01:28:19,997 INFO L226 Difference]: Without dead ends: 156 [2019-10-15 01:28:19,998 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 [2019-10-15 01:28:19,998 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2019-10-15 01:28:20,019 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 153. [2019-10-15 01:28:20,020 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 153 states. [2019-10-15 01:28:20,021 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 198 transitions. [2019-10-15 01:28:20,021 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 198 transitions. Word has length 140 [2019-10-15 01:28:20,022 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:28:20,022 INFO L462 AbstractCegarLoop]: Abstraction has 153 states and 198 transitions. [2019-10-15 01:28:20,022 INFO L463 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-10-15 01:28:20,022 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 198 transitions. [2019-10-15 01:28:20,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2019-10-15 01:28:20,024 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:28:20,024 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] [2019-10-15 01:28:20,229 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:28:20,230 INFO L410 AbstractCegarLoop]: === Iteration 6 === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:28:20,230 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:28:20,230 INFO L82 PathProgramCache]: Analyzing trace with hash -404425876, now seen corresponding path program 1 times [2019-10-15 01:28:20,231 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-15 01:28:20,231 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [479324201] [2019-10-15 01:28:20,231 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:28:20,232 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:28:20,232 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:28:20,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:28:20,313 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2019-10-15 01:28:20,315 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [479324201] [2019-10-15 01:28:20,315 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1851340594] [2019-10-15 01:28:20,316 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 [2019-10-15 01:28:20,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:28:20,522 INFO L256 TraceCheckSpWp]: Trace formula consists of 956 conjuncts, 9 conjunts are in the unsatisfiable core [2019-10-15 01:28:20,526 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:28:20,668 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2019-10-15 01:28:20,668 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:28:20,938 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:28:20,954 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:28:20,958 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:28:20,961 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:28:20,965 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:28:20,998 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2019-10-15 01:28:20,999 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleAbstractInterpretation [1667386868] [2019-10-15 01:28:20,999 INFO L211 CegarAbsIntRunner]: Running AI on error trace of length 146 [2019-10-15 01:28:21,001 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-10-15 01:28:21,002 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-10-15 01:28:21,017 INFO L266 AbstractInterpreter]: Error location(s) were unreachable [2019-10-15 01:28:21,017 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. [2019-10-15 01:28:21,017 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:28:21,018 INFO L536 sIntCurrentIteration]: Generating AbsInt predicates [2019-10-15 01:28:21,050 INFO L227 lantSequenceWeakener]: Weakened 32 states. On average, predicates are now at 71.97% of their original sizes. [2019-10-15 01:28:21,050 INFO L551 sIntCurrentIteration]: Unifying AI predicates [2019-10-15 01:28:21,159 INFO L553 sIntCurrentIteration]: We unified 144 AI predicates to 144 [2019-10-15 01:28:21,159 INFO L562 sIntCurrentIteration]: Finished generation of AbsInt predicates [2019-10-15 01:28:21,159 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 3 imperfect interpolant sequences. [2019-10-15 01:28:21,160 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [5, 7, 5] total 24 [2019-10-15 01:28:21,160 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1952486417] [2019-10-15 01:28:21,161 INFO L442 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-10-15 01:28:21,161 INFO L137 tionRefinementEngine]: Using predicate unifier AbsIntPredicateUnifier provided by strategy TAIPAN [2019-10-15 01:28:21,161 INFO L124 tionRefinementEngine]: Using hoare triple checker CachingHoareTripleCheckerMap provided by strategy [2019-10-15 01:28:21,161 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-10-15 01:28:21,162 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=126, Unknown=0, NotChecked=0, Total=156 [2019-10-15 01:28:21,162 INFO L87 Difference]: Start difference. First operand 153 states and 198 transitions. Second operand 13 states. [2019-10-15 01:28:22,295 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:28:22,295 INFO L93 Difference]: Finished difference Result 276 states and 369 transitions. [2019-10-15 01:28:22,295 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-10-15 01:28:22,296 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 145 [2019-10-15 01:28:22,296 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:28:22,298 INFO L225 Difference]: With dead ends: 276 [2019-10-15 01:28:22,298 INFO L226 Difference]: Without dead ends: 155 [2019-10-15 01:28:22,299 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 133 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=126, Unknown=0, NotChecked=0, Total=156 [2019-10-15 01:28:22,300 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2019-10-15 01:28:22,311 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 155. [2019-10-15 01:28:22,311 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 155 states. [2019-10-15 01:28:22,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 155 states to 155 states and 201 transitions. [2019-10-15 01:28:22,313 INFO L78 Accepts]: Start accepts. Automaton has 155 states and 201 transitions. Word has length 145 [2019-10-15 01:28:22,314 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:28:22,314 INFO L462 AbstractCegarLoop]: Abstraction has 155 states and 201 transitions. [2019-10-15 01:28:22,314 INFO L463 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-10-15 01:28:22,315 INFO L276 IsEmpty]: Start isEmpty. Operand 155 states and 201 transitions. [2019-10-15 01:28:22,317 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2019-10-15 01:28:22,317 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:28:22,317 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] [2019-10-15 01:28:22,524 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:28:22,524 INFO L410 AbstractCegarLoop]: === Iteration 7 === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:28:22,525 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:28:22,526 INFO L82 PathProgramCache]: Analyzing trace with hash -875782226, now seen corresponding path program 1 times [2019-10-15 01:28:22,526 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-15 01:28:22,527 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [180861202] [2019-10-15 01:28:22,527 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:28:22,527 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:28:22,527 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:28:22,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:28:22,685 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-10-15 01:28:22,685 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [180861202] [2019-10-15 01:28:22,685 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1390835134] [2019-10-15 01:28:22,686 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 [2019-10-15 01:28:22,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:28:22,874 INFO L256 TraceCheckSpWp]: Trace formula consists of 959 conjuncts, 8 conjunts are in the unsatisfiable core [2019-10-15 01:28:22,878 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:28:22,942 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-10-15 01:28:22,943 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:28:23,112 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:28:23,126 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:28:23,151 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:28:23,168 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:28:23,176 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:28:23,180 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:28:23,183 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:28:23,219 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-10-15 01:28:23,222 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleAbstractInterpretation [1383052819] [2019-10-15 01:28:23,224 INFO L211 CegarAbsIntRunner]: Running AI on error trace of length 146 [2019-10-15 01:28:23,227 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-10-15 01:28:23,228 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-10-15 01:28:23,257 INFO L266 AbstractInterpreter]: Error location(s) were unreachable [2019-10-15 01:28:23,257 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. [2019-10-15 01:28:23,257 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:28:23,257 INFO L536 sIntCurrentIteration]: Generating AbsInt predicates [2019-10-15 01:28:23,303 INFO L227 lantSequenceWeakener]: Weakened 47 states. On average, predicates are now at 73.88% of their original sizes. [2019-10-15 01:28:23,303 INFO L551 sIntCurrentIteration]: Unifying AI predicates [2019-10-15 01:28:23,515 INFO L553 sIntCurrentIteration]: We unified 144 AI predicates to 144 [2019-10-15 01:28:23,515 INFO L562 sIntCurrentIteration]: Finished generation of AbsInt predicates [2019-10-15 01:28:23,516 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 3 imperfect interpolant sequences. [2019-10-15 01:28:23,516 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [10, 5, 5] total 30 [2019-10-15 01:28:23,516 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1624753490] [2019-10-15 01:28:23,517 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-10-15 01:28:23,517 INFO L137 tionRefinementEngine]: Using predicate unifier AbsIntPredicateUnifier provided by strategy TAIPAN [2019-10-15 01:28:23,517 INFO L124 tionRefinementEngine]: Using hoare triple checker CachingHoareTripleCheckerMap provided by strategy [2019-10-15 01:28:23,517 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-10-15 01:28:23,518 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=298, Unknown=0, NotChecked=0, Total=342 [2019-10-15 01:28:23,518 INFO L87 Difference]: Start difference. First operand 155 states and 201 transitions. Second operand 19 states. [2019-10-15 01:28:25,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:28:25,195 INFO L93 Difference]: Finished difference Result 286 states and 381 transitions. [2019-10-15 01:28:25,196 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-10-15 01:28:25,196 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 145 [2019-10-15 01:28:25,196 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:28:25,198 INFO L225 Difference]: With dead ends: 286 [2019-10-15 01:28:25,198 INFO L226 Difference]: Without dead ends: 165 [2019-10-15 01:28:25,202 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 [2019-10-15 01:28:25,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165 states. [2019-10-15 01:28:25,214 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165 to 165. [2019-10-15 01:28:25,215 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 165 states. [2019-10-15 01:28:25,217 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 165 states to 165 states and 209 transitions. [2019-10-15 01:28:25,217 INFO L78 Accepts]: Start accepts. Automaton has 165 states and 209 transitions. Word has length 145 [2019-10-15 01:28:25,220 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:28:25,220 INFO L462 AbstractCegarLoop]: Abstraction has 165 states and 209 transitions. [2019-10-15 01:28:25,220 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-10-15 01:28:25,220 INFO L276 IsEmpty]: Start isEmpty. Operand 165 states and 209 transitions. [2019-10-15 01:28:25,223 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2019-10-15 01:28:25,224 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:28:25,224 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] [2019-10-15 01:28:25,430 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:28:25,430 INFO L410 AbstractCegarLoop]: === Iteration 8 === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:28:25,430 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:28:25,430 INFO L82 PathProgramCache]: Analyzing trace with hash 1818113964, now seen corresponding path program 1 times [2019-10-15 01:28:25,430 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-15 01:28:25,431 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [597903056] [2019-10-15 01:28:25,431 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:28:25,431 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:28:25,431 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:28:25,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:28:25,555 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-10-15 01:28:25,556 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [597903056] [2019-10-15 01:28:25,556 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1585611067] [2019-10-15 01:28:25,556 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 [2019-10-15 01:28:25,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:28:25,739 INFO L256 TraceCheckSpWp]: Trace formula consists of 962 conjuncts, 8 conjunts are in the unsatisfiable core [2019-10-15 01:28:25,744 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:28:25,771 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-10-15 01:28:25,772 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:28:25,976 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:28:25,987 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:28:26,046 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:28:26,064 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:28:26,068 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:28:26,074 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:28:26,084 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:28:26,103 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-10-15 01:28:26,104 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleAbstractInterpretation [1450483010] [2019-10-15 01:28:26,104 INFO L211 CegarAbsIntRunner]: Running AI on error trace of length 146 [2019-10-15 01:28:26,106 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-10-15 01:28:26,106 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-10-15 01:28:26,121 INFO L266 AbstractInterpreter]: Error location(s) were unreachable [2019-10-15 01:28:26,121 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. [2019-10-15 01:28:26,122 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:28:26,122 INFO L536 sIntCurrentIteration]: Generating AbsInt predicates [2019-10-15 01:28:26,155 INFO L227 lantSequenceWeakener]: Weakened 48 states. On average, predicates are now at 73.9% of their original sizes. [2019-10-15 01:28:26,155 INFO L551 sIntCurrentIteration]: Unifying AI predicates [2019-10-15 01:28:26,339 INFO L553 sIntCurrentIteration]: We unified 144 AI predicates to 144 [2019-10-15 01:28:26,339 INFO L562 sIntCurrentIteration]: Finished generation of AbsInt predicates [2019-10-15 01:28:26,340 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 3 imperfect interpolant sequences. [2019-10-15 01:28:26,340 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [10, 5, 5] total 31 [2019-10-15 01:28:26,340 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [375359748] [2019-10-15 01:28:26,341 INFO L442 AbstractCegarLoop]: Interpolant automaton has 20 states [2019-10-15 01:28:26,341 INFO L137 tionRefinementEngine]: Using predicate unifier AbsIntPredicateUnifier provided by strategy TAIPAN [2019-10-15 01:28:26,341 INFO L124 tionRefinementEngine]: Using hoare triple checker CachingHoareTripleCheckerMap provided by strategy [2019-10-15 01:28:26,342 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2019-10-15 01:28:26,342 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=334, Unknown=0, NotChecked=0, Total=380 [2019-10-15 01:28:26,342 INFO L87 Difference]: Start difference. First operand 165 states and 209 transitions. Second operand 20 states. [2019-10-15 01:28:28,319 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:28:28,319 INFO L93 Difference]: Finished difference Result 296 states and 389 transitions. [2019-10-15 01:28:28,319 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-10-15 01:28:28,319 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 145 [2019-10-15 01:28:28,320 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:28:28,321 INFO L225 Difference]: With dead ends: 296 [2019-10-15 01:28:28,321 INFO L226 Difference]: Without dead ends: 180 [2019-10-15 01:28:28,322 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 126 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=46, Invalid=334, Unknown=0, NotChecked=0, Total=380 [2019-10-15 01:28:28,323 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2019-10-15 01:28:28,331 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 180. [2019-10-15 01:28:28,331 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 180 states. [2019-10-15 01:28:28,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 223 transitions. [2019-10-15 01:28:28,333 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 223 transitions. Word has length 145 [2019-10-15 01:28:28,333 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:28:28,333 INFO L462 AbstractCegarLoop]: Abstraction has 180 states and 223 transitions. [2019-10-15 01:28:28,333 INFO L463 AbstractCegarLoop]: Interpolant automaton has 20 states. [2019-10-15 01:28:28,334 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 223 transitions. [2019-10-15 01:28:28,335 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2019-10-15 01:28:28,335 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:28:28,335 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] [2019-10-15 01:28:28,540 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:28:28,541 INFO L410 AbstractCegarLoop]: === Iteration 9 === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:28:28,541 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:28:28,542 INFO L82 PathProgramCache]: Analyzing trace with hash 761382762, now seen corresponding path program 1 times [2019-10-15 01:28:28,542 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-15 01:28:28,542 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [469717233] [2019-10-15 01:28:28,542 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:28:28,543 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:28:28,543 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:28:28,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:28:28,599 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2019-10-15 01:28:28,599 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [469717233] [2019-10-15 01:28:28,600 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1063846945] [2019-10-15 01:28:28,600 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 [2019-10-15 01:28:28,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:28:28,821 INFO L256 TraceCheckSpWp]: Trace formula consists of 959 conjuncts, 10 conjunts are in the unsatisfiable core [2019-10-15 01:28:28,825 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:28:28,865 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-10-15 01:28:28,865 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:28:29,079 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:28:29,089 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:28:29,102 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:28:29,112 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:28:29,129 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:28:29,146 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:28:29,148 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:28:29,158 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:28:29,160 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:28:29,180 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-10-15 01:28:29,181 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleAbstractInterpretation [1822822657] [2019-10-15 01:28:29,181 INFO L211 CegarAbsIntRunner]: Running AI on error trace of length 146 [2019-10-15 01:28:29,182 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-10-15 01:28:29,183 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-10-15 01:28:29,200 INFO L266 AbstractInterpreter]: Error location(s) were unreachable [2019-10-15 01:28:29,200 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. [2019-10-15 01:28:29,200 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:28:29,201 INFO L536 sIntCurrentIteration]: Generating AbsInt predicates [2019-10-15 01:28:29,240 INFO L227 lantSequenceWeakener]: Weakened 66 states. On average, predicates are now at 73.92% of their original sizes. [2019-10-15 01:28:29,241 INFO L551 sIntCurrentIteration]: Unifying AI predicates [2019-10-15 01:28:29,624 INFO L553 sIntCurrentIteration]: We unified 144 AI predicates to 144 [2019-10-15 01:28:29,624 INFO L562 sIntCurrentIteration]: Finished generation of AbsInt predicates [2019-10-15 01:28:29,624 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 3 imperfect interpolant sequences. [2019-10-15 01:28:29,625 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [5, 5, 5] total 34 [2019-10-15 01:28:29,625 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [458352122] [2019-10-15 01:28:29,625 INFO L442 AbstractCegarLoop]: Interpolant automaton has 27 states [2019-10-15 01:28:29,626 INFO L137 tionRefinementEngine]: Using predicate unifier AbsIntPredicateUnifier provided by strategy TAIPAN [2019-10-15 01:28:29,626 INFO L124 tionRefinementEngine]: Using hoare triple checker CachingHoareTripleCheckerMap provided by strategy [2019-10-15 01:28:29,626 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2019-10-15 01:28:29,627 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=637, Unknown=0, NotChecked=0, Total=702 [2019-10-15 01:28:29,627 INFO L87 Difference]: Start difference. First operand 180 states and 223 transitions. Second operand 27 states. [2019-10-15 01:28:32,214 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:28:32,215 INFO L93 Difference]: Finished difference Result 300 states and 388 transitions. [2019-10-15 01:28:32,215 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2019-10-15 01:28:32,215 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 145 [2019-10-15 01:28:32,216 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:28:32,217 INFO L225 Difference]: With dead ends: 300 [2019-10-15 01:28:32,217 INFO L226 Difference]: Without dead ends: 182 [2019-10-15 01:28:32,222 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 119 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 170 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=75, Invalid=737, Unknown=0, NotChecked=0, Total=812 [2019-10-15 01:28:32,222 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2019-10-15 01:28:32,238 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 182. [2019-10-15 01:28:32,239 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 182 states. [2019-10-15 01:28:32,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 182 states to 182 states and 224 transitions. [2019-10-15 01:28:32,240 INFO L78 Accepts]: Start accepts. Automaton has 182 states and 224 transitions. Word has length 145 [2019-10-15 01:28:32,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:28:32,241 INFO L462 AbstractCegarLoop]: Abstraction has 182 states and 224 transitions. [2019-10-15 01:28:32,241 INFO L463 AbstractCegarLoop]: Interpolant automaton has 27 states. [2019-10-15 01:28:32,241 INFO L276 IsEmpty]: Start isEmpty. Operand 182 states and 224 transitions. [2019-10-15 01:28:32,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2019-10-15 01:28:32,243 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:28:32,243 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] [2019-10-15 01:28:32,450 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:28:32,450 INFO L410 AbstractCegarLoop]: === Iteration 10 === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:28:32,451 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:28:32,451 INFO L82 PathProgramCache]: Analyzing trace with hash -77650900, now seen corresponding path program 1 times [2019-10-15 01:28:32,451 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-15 01:28:32,452 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [908332332] [2019-10-15 01:28:32,452 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:28:32,452 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:28:32,453 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:28:32,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:28:32,588 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-10-15 01:28:32,588 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [908332332] [2019-10-15 01:28:32,588 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1401435920] [2019-10-15 01:28:32,588 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 [2019-10-15 01:28:32,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:28:32,815 INFO L256 TraceCheckSpWp]: Trace formula consists of 962 conjuncts, 10 conjunts are in the unsatisfiable core [2019-10-15 01:28:32,820 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:28:32,859 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-10-15 01:28:32,859 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:28:33,077 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:28:33,095 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:28:33,107 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:28:33,118 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:28:33,136 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:28:33,158 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:28:33,161 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:28:33,164 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:28:33,167 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:28:33,193 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-10-15 01:28:33,194 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleAbstractInterpretation [1741647747] [2019-10-15 01:28:33,194 INFO L211 CegarAbsIntRunner]: Running AI on error trace of length 146 [2019-10-15 01:28:33,196 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-10-15 01:28:33,196 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-10-15 01:28:33,212 INFO L266 AbstractInterpreter]: Error location(s) were unreachable [2019-10-15 01:28:33,212 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. [2019-10-15 01:28:33,213 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:28:33,213 INFO L536 sIntCurrentIteration]: Generating AbsInt predicates [2019-10-15 01:28:33,253 INFO L227 lantSequenceWeakener]: Weakened 68 states. On average, predicates are now at 73.89% of their original sizes. [2019-10-15 01:28:33,254 INFO L551 sIntCurrentIteration]: Unifying AI predicates [2019-10-15 01:28:33,690 INFO L553 sIntCurrentIteration]: We unified 144 AI predicates to 144 [2019-10-15 01:28:33,690 INFO L562 sIntCurrentIteration]: Finished generation of AbsInt predicates [2019-10-15 01:28:33,691 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 3 imperfect interpolant sequences. [2019-10-15 01:28:33,691 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [8, 5, 5] total 39 [2019-10-15 01:28:33,691 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [626128554] [2019-10-15 01:28:33,692 INFO L442 AbstractCegarLoop]: Interpolant automaton has 29 states [2019-10-15 01:28:33,693 INFO L137 tionRefinementEngine]: Using predicate unifier AbsIntPredicateUnifier provided by strategy TAIPAN [2019-10-15 01:28:33,693 INFO L124 tionRefinementEngine]: Using hoare triple checker CachingHoareTripleCheckerMap provided by strategy [2019-10-15 01:28:33,694 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2019-10-15 01:28:33,694 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=743, Unknown=0, NotChecked=0, Total=812 [2019-10-15 01:28:33,695 INFO L87 Difference]: Start difference. First operand 182 states and 224 transitions. Second operand 29 states. [2019-10-15 01:28:37,982 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:28:37,982 INFO L93 Difference]: Finished difference Result 368 states and 490 transitions. [2019-10-15 01:28:37,983 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2019-10-15 01:28:37,983 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 145 [2019-10-15 01:28:37,983 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:28:37,986 INFO L225 Difference]: With dead ends: 368 [2019-10-15 01:28:37,986 INFO L226 Difference]: Without dead ends: 251 [2019-10-15 01:28:37,987 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 [2019-10-15 01:28:37,988 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 251 states. [2019-10-15 01:28:38,001 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 251 to 251. [2019-10-15 01:28:38,002 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 251 states. [2019-10-15 01:28:38,003 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 251 states to 251 states and 299 transitions. [2019-10-15 01:28:38,003 INFO L78 Accepts]: Start accepts. Automaton has 251 states and 299 transitions. Word has length 145 [2019-10-15 01:28:38,004 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:28:38,004 INFO L462 AbstractCegarLoop]: Abstraction has 251 states and 299 transitions. [2019-10-15 01:28:38,004 INFO L463 AbstractCegarLoop]: Interpolant automaton has 29 states. [2019-10-15 01:28:38,004 INFO L276 IsEmpty]: Start isEmpty. Operand 251 states and 299 transitions. [2019-10-15 01:28:38,006 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 167 [2019-10-15 01:28:38,006 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:28:38,006 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] [2019-10-15 01:28:38,216 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:28:38,217 INFO L410 AbstractCegarLoop]: === Iteration 11 === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:28:38,218 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:28:38,218 INFO L82 PathProgramCache]: Analyzing trace with hash 1987498830, now seen corresponding path program 1 times [2019-10-15 01:28:38,218 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-15 01:28:38,219 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1914150910] [2019-10-15 01:28:38,219 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:28:38,219 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:28:38,219 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:28:38,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:28:38,295 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2019-10-15 01:28:38,296 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1914150910] [2019-10-15 01:28:38,296 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [805298752] [2019-10-15 01:28:38,296 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 [2019-10-15 01:28:38,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:28:38,589 INFO L256 TraceCheckSpWp]: Trace formula consists of 1025 conjuncts, 2 conjunts are in the unsatisfiable core [2019-10-15 01:28:38,593 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:28:38,616 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 46 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2019-10-15 01:28:38,616 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:28:38,764 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2019-10-15 01:28:38,766 INFO L223 tionRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2019-10-15 01:28:38,766 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [6] total 7 [2019-10-15 01:28:38,766 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [296409164] [2019-10-15 01:28:38,767 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-15 01:28:38,767 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-10-15 01:28:38,767 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-15 01:28:38,768 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2019-10-15 01:28:38,768 INFO L87 Difference]: Start difference. First operand 251 states and 299 transitions. Second operand 3 states. [2019-10-15 01:28:38,807 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:28:38,807 INFO L93 Difference]: Finished difference Result 372 states and 468 transitions. [2019-10-15 01:28:38,808 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-15 01:28:38,808 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 166 [2019-10-15 01:28:38,809 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:28:38,812 INFO L225 Difference]: With dead ends: 372 [2019-10-15 01:28:38,812 INFO L226 Difference]: Without dead ends: 258 [2019-10-15 01:28:38,813 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 [2019-10-15 01:28:38,813 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 258 states. [2019-10-15 01:28:38,832 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 258 to 254. [2019-10-15 01:28:38,832 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 254 states. [2019-10-15 01:28:38,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 254 states to 254 states and 302 transitions. [2019-10-15 01:28:38,836 INFO L78 Accepts]: Start accepts. Automaton has 254 states and 302 transitions. Word has length 166 [2019-10-15 01:28:38,837 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:28:38,837 INFO L462 AbstractCegarLoop]: Abstraction has 254 states and 302 transitions. [2019-10-15 01:28:38,837 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-15 01:28:38,837 INFO L276 IsEmpty]: Start isEmpty. Operand 254 states and 302 transitions. [2019-10-15 01:28:38,840 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2019-10-15 01:28:38,840 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:28:38,840 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] [2019-10-15 01:28:39,045 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:28:39,045 INFO L410 AbstractCegarLoop]: === Iteration 12 === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:28:39,045 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:28:39,046 INFO L82 PathProgramCache]: Analyzing trace with hash -1822871901, now seen corresponding path program 1 times [2019-10-15 01:28:39,046 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-15 01:28:39,046 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1461377093] [2019-10-15 01:28:39,046 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:28:39,046 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:28:39,046 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:28:39,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:28:39,137 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2019-10-15 01:28:39,137 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1461377093] [2019-10-15 01:28:39,137 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [555553211] [2019-10-15 01:28:39,137 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 [2019-10-15 01:28:39,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:28:39,398 INFO L256 TraceCheckSpWp]: Trace formula consists of 1025 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-15 01:28:39,402 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:28:39,424 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 46 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2019-10-15 01:28:39,424 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:28:39,525 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2019-10-15 01:28:39,525 INFO L223 tionRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2019-10-15 01:28:39,525 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [6] total 7 [2019-10-15 01:28:39,525 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1872724697] [2019-10-15 01:28:39,527 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-15 01:28:39,527 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-10-15 01:28:39,528 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-15 01:28:39,528 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2019-10-15 01:28:39,528 INFO L87 Difference]: Start difference. First operand 254 states and 302 transitions. Second operand 3 states. [2019-10-15 01:28:39,556 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:28:39,556 INFO L93 Difference]: Finished difference Result 374 states and 466 transitions. [2019-10-15 01:28:39,556 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-15 01:28:39,556 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 167 [2019-10-15 01:28:39,557 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:28:39,560 INFO L225 Difference]: With dead ends: 374 [2019-10-15 01:28:39,561 INFO L226 Difference]: Without dead ends: 257 [2019-10-15 01:28:39,562 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 [2019-10-15 01:28:39,563 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 257 states. [2019-10-15 01:28:39,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 257 to 254. [2019-10-15 01:28:39,577 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 254 states. [2019-10-15 01:28:39,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 254 states to 254 states and 299 transitions. [2019-10-15 01:28:39,580 INFO L78 Accepts]: Start accepts. Automaton has 254 states and 299 transitions. Word has length 167 [2019-10-15 01:28:39,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:28:39,581 INFO L462 AbstractCegarLoop]: Abstraction has 254 states and 299 transitions. [2019-10-15 01:28:39,581 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-15 01:28:39,581 INFO L276 IsEmpty]: Start isEmpty. Operand 254 states and 299 transitions. [2019-10-15 01:28:39,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2019-10-15 01:28:39,583 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:28:39,584 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] [2019-10-15 01:28:39,788 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:28:39,789 INFO L410 AbstractCegarLoop]: === Iteration 13 === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:28:39,790 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:28:39,791 INFO L82 PathProgramCache]: Analyzing trace with hash -1595624526, now seen corresponding path program 1 times [2019-10-15 01:28:39,791 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-15 01:28:39,791 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [55316570] [2019-10-15 01:28:39,792 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:28:39,792 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:28:39,792 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:28:39,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:28:39,945 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2019-10-15 01:28:39,946 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [55316570] [2019-10-15 01:28:39,946 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1460690776] [2019-10-15 01:28:39,947 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 [2019-10-15 01:28:40,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:28:40,403 INFO L256 TraceCheckSpWp]: Trace formula consists of 1025 conjuncts, 2 conjunts are in the unsatisfiable core [2019-10-15 01:28:40,408 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:28:40,457 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 48 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-10-15 01:28:40,457 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:28:40,701 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 7 proven. 3 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2019-10-15 01:28:40,701 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2019-10-15 01:28:40,702 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6, 4] total 9 [2019-10-15 01:28:40,702 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [546473270] [2019-10-15 01:28:40,704 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-15 01:28:40,704 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-10-15 01:28:40,705 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-15 01:28:40,705 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2019-10-15 01:28:40,705 INFO L87 Difference]: Start difference. First operand 254 states and 299 transitions. Second operand 3 states. [2019-10-15 01:28:40,742 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:28:40,742 INFO L93 Difference]: Finished difference Result 469 states and 590 transitions. [2019-10-15 01:28:40,743 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-15 01:28:40,743 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 167 [2019-10-15 01:28:40,744 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:28:40,747 INFO L225 Difference]: With dead ends: 469 [2019-10-15 01:28:40,748 INFO L226 Difference]: Without dead ends: 352 [2019-10-15 01:28:40,749 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 [2019-10-15 01:28:40,750 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 352 states. [2019-10-15 01:28:40,782 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 352 to 346. [2019-10-15 01:28:40,782 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 346 states. [2019-10-15 01:28:40,785 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 346 states to 346 states and 422 transitions. [2019-10-15 01:28:40,786 INFO L78 Accepts]: Start accepts. Automaton has 346 states and 422 transitions. Word has length 167 [2019-10-15 01:28:40,787 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:28:40,787 INFO L462 AbstractCegarLoop]: Abstraction has 346 states and 422 transitions. [2019-10-15 01:28:40,787 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-15 01:28:40,787 INFO L276 IsEmpty]: Start isEmpty. Operand 346 states and 422 transitions. [2019-10-15 01:28:40,790 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2019-10-15 01:28:40,790 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:28:40,791 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] [2019-10-15 01:28:40,998 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:28:40,999 INFO L410 AbstractCegarLoop]: === Iteration 14 === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:28:40,999 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:28:40,999 INFO L82 PathProgramCache]: Analyzing trace with hash 1967375344, now seen corresponding path program 1 times [2019-10-15 01:28:41,000 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-15 01:28:41,000 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [596907043] [2019-10-15 01:28:41,000 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:28:41,000 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:28:41,001 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:28:41,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:28:41,123 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2019-10-15 01:28:41,123 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [596907043] [2019-10-15 01:28:41,125 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [219923817] [2019-10-15 01:28:41,125 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 [2019-10-15 01:28:41,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:28:41,521 INFO L256 TraceCheckSpWp]: Trace formula consists of 1024 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-15 01:28:41,531 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:28:41,621 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 46 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2019-10-15 01:28:41,622 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:28:41,958 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2019-10-15 01:28:41,958 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2019-10-15 01:28:41,959 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6, 6] total 9 [2019-10-15 01:28:41,959 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1257282070] [2019-10-15 01:28:41,960 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-15 01:28:41,960 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-10-15 01:28:41,960 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-15 01:28:41,961 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2019-10-15 01:28:41,961 INFO L87 Difference]: Start difference. First operand 346 states and 422 transitions. Second operand 4 states. [2019-10-15 01:28:42,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:28:42,085 INFO L93 Difference]: Finished difference Result 555 states and 703 transitions. [2019-10-15 01:28:42,085 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-15 01:28:42,085 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 167 [2019-10-15 01:28:42,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:28:42,091 INFO L225 Difference]: With dead ends: 555 [2019-10-15 01:28:42,091 INFO L226 Difference]: Without dead ends: 346 [2019-10-15 01:28:42,093 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 [2019-10-15 01:28:42,094 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 346 states. [2019-10-15 01:28:42,117 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 346 to 346. [2019-10-15 01:28:42,117 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 346 states. [2019-10-15 01:28:42,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 346 states to 346 states and 421 transitions. [2019-10-15 01:28:42,121 INFO L78 Accepts]: Start accepts. Automaton has 346 states and 421 transitions. Word has length 167 [2019-10-15 01:28:42,121 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:28:42,122 INFO L462 AbstractCegarLoop]: Abstraction has 346 states and 421 transitions. [2019-10-15 01:28:42,122 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-15 01:28:42,122 INFO L276 IsEmpty]: Start isEmpty. Operand 346 states and 421 transitions. [2019-10-15 01:28:42,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 169 [2019-10-15 01:28:42,124 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:28:42,125 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] [2019-10-15 01:28:42,332 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:28:42,333 INFO L410 AbstractCegarLoop]: === Iteration 15 === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:28:42,333 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:28:42,334 INFO L82 PathProgramCache]: Analyzing trace with hash -563979487, now seen corresponding path program 1 times [2019-10-15 01:28:42,334 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-15 01:28:42,334 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1463279745] [2019-10-15 01:28:42,335 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:28:42,335 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:28:42,335 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:28:42,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:28:42,664 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 4 proven. 13 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2019-10-15 01:28:42,664 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1463279745] [2019-10-15 01:28:42,665 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [468102385] [2019-10-15 01:28:42,665 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 [2019-10-15 01:28:43,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:28:43,168 INFO L256 TraceCheckSpWp]: Trace formula consists of 1024 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-15 01:28:43,177 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:28:43,225 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 46 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2019-10-15 01:28:43,226 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:28:43,417 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2019-10-15 01:28:43,417 INFO L223 tionRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2019-10-15 01:28:43,418 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [11] total 12 [2019-10-15 01:28:43,418 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [292544058] [2019-10-15 01:28:43,422 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-15 01:28:43,423 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-10-15 01:28:43,423 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-15 01:28:43,423 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=108, Unknown=0, NotChecked=0, Total=132 [2019-10-15 01:28:43,423 INFO L87 Difference]: Start difference. First operand 346 states and 421 transitions. Second operand 3 states. [2019-10-15 01:28:43,460 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:28:43,461 INFO L93 Difference]: Finished difference Result 568 states and 719 transitions. [2019-10-15 01:28:43,461 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-15 01:28:43,461 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 168 [2019-10-15 01:28:43,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:28:43,465 INFO L225 Difference]: With dead ends: 568 [2019-10-15 01:28:43,465 INFO L226 Difference]: Without dead ends: 359 [2019-10-15 01:28:43,469 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 346 GetRequests, 336 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=24, Invalid=108, Unknown=0, NotChecked=0, Total=132 [2019-10-15 01:28:43,470 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 359 states. [2019-10-15 01:28:43,500 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 359 to 353. [2019-10-15 01:28:43,500 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 353 states. [2019-10-15 01:28:43,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 353 states to 353 states and 430 transitions. [2019-10-15 01:28:43,506 INFO L78 Accepts]: Start accepts. Automaton has 353 states and 430 transitions. Word has length 168 [2019-10-15 01:28:43,506 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:28:43,506 INFO L462 AbstractCegarLoop]: Abstraction has 353 states and 430 transitions. [2019-10-15 01:28:43,506 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-15 01:28:43,507 INFO L276 IsEmpty]: Start isEmpty. Operand 353 states and 430 transitions. [2019-10-15 01:28:43,508 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 169 [2019-10-15 01:28:43,509 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:28:43,509 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] [2019-10-15 01:28:43,716 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:28:43,716 INFO L410 AbstractCegarLoop]: === Iteration 16 === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:28:43,716 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:28:43,716 INFO L82 PathProgramCache]: Analyzing trace with hash 275054175, now seen corresponding path program 1 times [2019-10-15 01:28:43,717 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-15 01:28:43,718 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2045428074] [2019-10-15 01:28:43,718 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:28:43,718 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:28:43,718 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:28:43,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:28:43,837 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2019-10-15 01:28:43,838 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2045428074] [2019-10-15 01:28:43,838 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [652169395] [2019-10-15 01:28:43,838 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 [2019-10-15 01:28:44,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:28:44,256 INFO L256 TraceCheckSpWp]: Trace formula consists of 1025 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-15 01:28:44,267 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:28:44,375 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 46 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2019-10-15 01:28:44,376 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:28:44,723 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 4 proven. 4 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2019-10-15 01:28:44,724 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2019-10-15 01:28:44,724 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6, 6] total 11 [2019-10-15 01:28:44,724 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [61453625] [2019-10-15 01:28:44,725 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-15 01:28:44,726 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-10-15 01:28:44,726 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-15 01:28:44,726 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2019-10-15 01:28:44,726 INFO L87 Difference]: Start difference. First operand 353 states and 430 transitions. Second operand 4 states. [2019-10-15 01:28:44,859 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:28:44,859 INFO L93 Difference]: Finished difference Result 569 states and 719 transitions. [2019-10-15 01:28:44,860 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-15 01:28:44,860 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 168 [2019-10-15 01:28:44,861 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:28:44,869 INFO L225 Difference]: With dead ends: 569 [2019-10-15 01:28:44,869 INFO L226 Difference]: Without dead ends: 353 [2019-10-15 01:28:44,870 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 [2019-10-15 01:28:44,871 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 353 states. [2019-10-15 01:28:44,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 353 to 353. [2019-10-15 01:28:44,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 353 states. [2019-10-15 01:28:44,902 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 353 states to 353 states and 428 transitions. [2019-10-15 01:28:44,903 INFO L78 Accepts]: Start accepts. Automaton has 353 states and 428 transitions. Word has length 168 [2019-10-15 01:28:44,905 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:28:44,905 INFO L462 AbstractCegarLoop]: Abstraction has 353 states and 428 transitions. [2019-10-15 01:28:44,905 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-15 01:28:44,905 INFO L276 IsEmpty]: Start isEmpty. Operand 353 states and 428 transitions. [2019-10-15 01:28:44,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 170 [2019-10-15 01:28:44,906 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:28:44,907 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] [2019-10-15 01:28:45,112 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:28:45,112 INFO L410 AbstractCegarLoop]: === Iteration 17 === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:28:45,113 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:28:45,113 INFO L82 PathProgramCache]: Analyzing trace with hash -1085283410, now seen corresponding path program 1 times [2019-10-15 01:28:45,113 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-15 01:28:45,113 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1273615408] [2019-10-15 01:28:45,114 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:28:45,114 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:28:45,114 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:28:45,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:28:45,249 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2019-10-15 01:28:45,250 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1273615408] [2019-10-15 01:28:45,251 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [522526009] [2019-10-15 01:28:45,251 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