/usr/bin/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 -i ../../../trunk/examples/svcomp/loop-lit/gj2007.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-06 21:22:56,609 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-06 21:22:56,611 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-06 21:22:56,630 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-06 21:22:56,630 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-06 21:22:56,632 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-06 21:22:56,634 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-06 21:22:56,643 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-06 21:22:56,647 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-06 21:22:56,650 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-06 21:22:56,653 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-06 21:22:56,654 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-06 21:22:56,655 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-06 21:22:56,656 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-06 21:22:56,658 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-06 21:22:56,660 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-06 21:22:56,661 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-06 21:22:56,662 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-06 21:22:56,663 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-06 21:22:56,665 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-06 21:22:56,666 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-06 21:22:56,667 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-06 21:22:56,668 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-06 21:22:56,669 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-06 21:22:56,671 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-11-06 21:22:56,671 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-11-06 21:22:56,671 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-11-06 21:22:56,672 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-11-06 21:22:56,672 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-11-06 21:22:56,673 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-11-06 21:22:56,673 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-11-06 21:22:56,674 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-11-06 21:22:56,675 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-11-06 21:22:56,676 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-11-06 21:22:56,676 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-11-06 21:22:56,677 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-11-06 21:22:56,677 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-11-06 21:22:56,678 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-11-06 21:22:56,678 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-06 21:22:56,680 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-06 21:22:56,681 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-06 21:22:56,681 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 [2019-11-06 21:22:56,708 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-06 21:22:56,713 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-06 21:22:56,714 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-06 21:22:56,714 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-06 21:22:56,714 INFO L138 SettingsManager]: * Use SBE=true [2019-11-06 21:22:56,715 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-06 21:22:56,715 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-06 21:22:56,715 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-06 21:22:56,715 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-06 21:22:56,715 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-06 21:22:56,716 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-06 21:22:56,716 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-06 21:22:56,716 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-06 21:22:56,716 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-06 21:22:56,716 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-06 21:22:56,716 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-06 21:22:56,717 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-06 21:22:56,718 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-06 21:22:56,718 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-06 21:22:56,718 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-06 21:22:56,718 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-06 21:22:56,718 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-06 21:22:56,718 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-06 21:22:56,719 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-06 21:22:56,719 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-06 21:22:56,719 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-06 21:22:56,719 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-06 21:22:56,719 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-06 21:22:56,720 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-11-06 21:22:56,978 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-06 21:22:56,990 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-06 21:22:56,993 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-06 21:22:56,995 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-06 21:22:56,995 INFO L275 PluginConnector]: CDTParser initialized [2019-11-06 21:22:56,996 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/gj2007.i [2019-11-06 21:22:57,054 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d315bd746/c211677ee576483ca57b8bed098155e6/FLAGd014f20fa [2019-11-06 21:22:57,480 INFO L306 CDTParser]: Found 1 translation units. [2019-11-06 21:22:57,481 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-lit/gj2007.i [2019-11-06 21:22:57,486 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d315bd746/c211677ee576483ca57b8bed098155e6/FLAGd014f20fa [2019-11-06 21:22:57,889 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d315bd746/c211677ee576483ca57b8bed098155e6 [2019-11-06 21:22:57,906 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-06 21:22:57,907 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-06 21:22:57,908 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-06 21:22:57,909 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-06 21:22:57,912 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-06 21:22:57,913 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 09:22:57" (1/1) ... [2019-11-06 21:22:57,916 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@529b5f14 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:22:57, skipping insertion in model container [2019-11-06 21:22:57,916 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 09:22:57" (1/1) ... [2019-11-06 21:22:57,924 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-06 21:22:57,944 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-06 21:22:58,153 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-06 21:22:58,165 INFO L188 MainTranslator]: Completed pre-run [2019-11-06 21:22:58,185 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-06 21:22:58,202 INFO L192 MainTranslator]: Completed translation [2019-11-06 21:22:58,203 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:22:58 WrapperNode [2019-11-06 21:22:58,203 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-06 21:22:58,204 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-06 21:22:58,204 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-06 21:22:58,204 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-06 21:22:58,314 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:22:58" (1/1) ... [2019-11-06 21:22:58,314 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:22:58" (1/1) ... [2019-11-06 21:22:58,321 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:22:58" (1/1) ... [2019-11-06 21:22:58,322 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:22:58" (1/1) ... [2019-11-06 21:22:58,325 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:22:58" (1/1) ... [2019-11-06 21:22:58,330 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:22:58" (1/1) ... [2019-11-06 21:22:58,331 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:22:58" (1/1) ... [2019-11-06 21:22:58,332 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-06 21:22:58,333 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-06 21:22:58,333 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-06 21:22:58,333 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-06 21:22:58,334 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:22:58" (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 [2019-11-06 21:22:58,394 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-06 21:22:58,394 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-06 21:22:58,394 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-11-06 21:22:58,394 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-06 21:22:58,395 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-06 21:22:58,395 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assume [2019-11-06 21:22:58,395 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-11-06 21:22:58,395 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-11-06 21:22:58,395 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-06 21:22:58,395 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-06 21:22:58,395 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-06 21:22:58,566 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-06 21:22:58,567 INFO L284 CfgBuilder]: Removed 1 assume(true) statements. [2019-11-06 21:22:58,568 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 09:22:58 BoogieIcfgContainer [2019-11-06 21:22:58,568 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-06 21:22:58,569 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-06 21:22:58,569 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-06 21:22:58,572 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-06 21:22:58,573 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.11 09:22:57" (1/3) ... [2019-11-06 21:22:58,574 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5d2b6e78 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 09:22:58, skipping insertion in model container [2019-11-06 21:22:58,574 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:22:58" (2/3) ... [2019-11-06 21:22:58,574 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5d2b6e78 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 09:22:58, skipping insertion in model container [2019-11-06 21:22:58,574 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 09:22:58" (3/3) ... [2019-11-06 21:22:58,576 INFO L109 eAbstractionObserver]: Analyzing ICFG gj2007.i [2019-11-06 21:22:58,586 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-06 21:22:58,593 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-06 21:22:58,604 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-06 21:22:58,627 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-06 21:22:58,627 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-06 21:22:58,628 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-06 21:22:58,628 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-06 21:22:58,628 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-06 21:22:58,628 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-06 21:22:58,628 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-06 21:22:58,629 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-06 21:22:58,647 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2019-11-06 21:22:58,652 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-11-06 21:22:58,653 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:22:58,654 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:22:58,656 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:22:58,661 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:22:58,662 INFO L82 PathProgramCache]: Analyzing trace with hash 1712329921, now seen corresponding path program 1 times [2019-11-06 21:22:58,672 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:22:58,672 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [738087649] [2019-11-06 21:22:58,672 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:22:58,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:58,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:58,775 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:22:58,776 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [738087649] [2019-11-06 21:22:58,777 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 21:22:58,777 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-11-06 21:22:58,779 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1112255745] [2019-11-06 21:22:58,784 INFO L442 AbstractCegarLoop]: Interpolant automaton has 2 states [2019-11-06 21:22:58,784 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:22:58,798 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2019-11-06 21:22:58,799 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-11-06 21:22:58,802 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 2 states. [2019-11-06 21:22:58,823 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:22:58,823 INFO L93 Difference]: Finished difference Result 31 states and 35 transitions. [2019-11-06 21:22:58,824 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2019-11-06 21:22:58,825 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2019-11-06 21:22:58,825 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:22:58,831 INFO L225 Difference]: With dead ends: 31 [2019-11-06 21:22:58,832 INFO L226 Difference]: Without dead ends: 12 [2019-11-06 21:22:58,834 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-11-06 21:22:58,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2019-11-06 21:22:58,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2019-11-06 21:22:58,866 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2019-11-06 21:22:58,867 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 13 transitions. [2019-11-06 21:22:58,868 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 13 transitions. Word has length 10 [2019-11-06 21:22:58,869 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:22:58,869 INFO L462 AbstractCegarLoop]: Abstraction has 12 states and 13 transitions. [2019-11-06 21:22:58,869 INFO L463 AbstractCegarLoop]: Interpolant automaton has 2 states. [2019-11-06 21:22:58,869 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 13 transitions. [2019-11-06 21:22:58,870 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-11-06 21:22:58,870 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:22:58,870 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:22:58,871 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:22:58,871 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:22:58,871 INFO L82 PathProgramCache]: Analyzing trace with hash 1703094711, now seen corresponding path program 1 times [2019-11-06 21:22:58,871 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:22:58,872 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [935266648] [2019-11-06 21:22:58,872 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:22:58,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:58,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:58,933 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:22:58,937 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [935266648] [2019-11-06 21:22:58,937 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 21:22:58,938 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-06 21:22:58,938 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [534628514] [2019-11-06 21:22:58,940 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-06 21:22:58,942 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:22:58,942 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-06 21:22:58,943 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-06 21:22:58,943 INFO L87 Difference]: Start difference. First operand 12 states and 13 transitions. Second operand 3 states. [2019-11-06 21:22:58,984 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:22:58,984 INFO L93 Difference]: Finished difference Result 21 states and 25 transitions. [2019-11-06 21:22:58,985 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-06 21:22:58,985 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2019-11-06 21:22:58,986 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:22:58,986 INFO L225 Difference]: With dead ends: 21 [2019-11-06 21:22:58,987 INFO L226 Difference]: Without dead ends: 14 [2019-11-06 21:22:58,988 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-06 21:22:58,988 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2019-11-06 21:22:58,992 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2019-11-06 21:22:58,992 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2019-11-06 21:22:58,993 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2019-11-06 21:22:58,993 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 10 [2019-11-06 21:22:58,993 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:22:58,994 INFO L462 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2019-11-06 21:22:58,994 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-06 21:22:58,994 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2019-11-06 21:22:58,995 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2019-11-06 21:22:58,995 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:22:58,995 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:22:58,996 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:22:58,996 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:22:58,996 INFO L82 PathProgramCache]: Analyzing trace with hash 1337256884, now seen corresponding path program 1 times [2019-11-06 21:22:58,996 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:22:58,997 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2008483263] [2019-11-06 21:22:58,997 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:22:59,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:59,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:59,044 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:22:59,044 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2008483263] [2019-11-06 21:22:59,045 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [840217198] [2019-11-06 21:22:59,045 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 [2019-11-06 21:22:59,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:59,089 INFO L256 TraceCheckSpWp]: Trace formula consists of 28 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-06 21:22:59,095 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:22:59,142 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:22:59,142 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2019-11-06 21:22:59,143 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 5 [2019-11-06 21:22:59,143 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2128589930] [2019-11-06 21:22:59,143 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-06 21:22:59,144 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:22:59,144 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-06 21:22:59,144 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2019-11-06 21:22:59,145 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand 3 states. [2019-11-06 21:22:59,169 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:22:59,169 INFO L93 Difference]: Finished difference Result 21 states and 23 transitions. [2019-11-06 21:22:59,171 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-06 21:22:59,171 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 12 [2019-11-06 21:22:59,171 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:22:59,172 INFO L225 Difference]: With dead ends: 21 [2019-11-06 21:22:59,172 INFO L226 Difference]: Without dead ends: 16 [2019-11-06 21:22:59,173 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2019-11-06 21:22:59,173 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2019-11-06 21:22:59,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2019-11-06 21:22:59,177 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2019-11-06 21:22:59,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2019-11-06 21:22:59,178 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 12 [2019-11-06 21:22:59,178 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:22:59,178 INFO L462 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2019-11-06 21:22:59,178 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-06 21:22:59,179 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2019-11-06 21:22:59,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-11-06 21:22:59,179 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:22:59,180 INFO L410 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:22:59,388 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:22:59,389 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:22:59,390 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:22:59,390 INFO L82 PathProgramCache]: Analyzing trace with hash 2011681711, now seen corresponding path program 1 times [2019-11-06 21:22:59,391 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:22:59,391 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [241624506] [2019-11-06 21:22:59,391 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:22:59,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:59,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:59,429 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:22:59,430 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [241624506] [2019-11-06 21:22:59,430 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1935234534] [2019-11-06 21:22:59,430 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) [2019-11-06 21:22:59,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:22:59,472 INFO L256 TraceCheckSpWp]: Trace formula consists of 34 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-06 21:22:59,477 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:22:59,483 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:22:59,483 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:22:59,484 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 4 [2019-11-06 21:22:59,484 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [310484661] [2019-11-06 21:22:59,485 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-06 21:22:59,485 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:22:59,485 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-06 21:22:59,485 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-11-06 21:22:59,486 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 4 states. [2019-11-06 21:22:59,511 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:22:59,511 INFO L93 Difference]: Finished difference Result 25 states and 28 transitions. [2019-11-06 21:22:59,511 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-06 21:22:59,512 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 14 [2019-11-06 21:22:59,512 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:22:59,513 INFO L225 Difference]: With dead ends: 25 [2019-11-06 21:22:59,513 INFO L226 Difference]: Without dead ends: 17 [2019-11-06 21:22:59,514 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-11-06 21:22:59,514 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2019-11-06 21:22:59,517 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2019-11-06 21:22:59,518 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2019-11-06 21:22:59,519 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2019-11-06 21:22:59,519 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 14 [2019-11-06 21:22:59,519 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:22:59,519 INFO L462 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2019-11-06 21:22:59,520 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-06 21:22:59,520 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2019-11-06 21:22:59,520 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-11-06 21:22:59,521 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:22:59,521 INFO L410 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:22:59,728 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:22:59,729 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:22:59,730 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:22:59,730 INFO L82 PathProgramCache]: Analyzing trace with hash -1891741908, now seen corresponding path program 2 times [2019-11-06 21:22:59,731 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:22:59,731 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1209045773] [2019-11-06 21:22:59,732 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:22:59,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:59,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:22:59,803 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:22:59,803 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1209045773] [2019-11-06 21:22:59,803 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1797286368] [2019-11-06 21:22:59,804 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 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 [2019-11-06 21:22:59,847 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 21:22:59,847 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:22:59,849 INFO L256 TraceCheckSpWp]: Trace formula consists of 38 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-06 21:22:59,852 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:22:59,865 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:22:59,865 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:22:59,867 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 6 [2019-11-06 21:22:59,867 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1637330565] [2019-11-06 21:22:59,868 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-11-06 21:22:59,869 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:22:59,869 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-11-06 21:22:59,869 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2019-11-06 21:22:59,869 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand 6 states. [2019-11-06 21:22:59,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:22:59,927 INFO L93 Difference]: Finished difference Result 29 states and 33 transitions. [2019-11-06 21:22:59,928 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-11-06 21:22:59,928 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 16 [2019-11-06 21:22:59,929 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:22:59,929 INFO L225 Difference]: With dead ends: 29 [2019-11-06 21:22:59,929 INFO L226 Difference]: Without dead ends: 21 [2019-11-06 21:22:59,930 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2019-11-06 21:22:59,930 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2019-11-06 21:22:59,935 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2019-11-06 21:22:59,935 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2019-11-06 21:22:59,936 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2019-11-06 21:22:59,936 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 16 [2019-11-06 21:22:59,937 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:22:59,937 INFO L462 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2019-11-06 21:22:59,937 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-11-06 21:22:59,937 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2019-11-06 21:22:59,938 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-11-06 21:22:59,938 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:22:59,938 INFO L410 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:23:00,142 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:23:00,143 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:23:00,144 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:23:00,144 INFO L82 PathProgramCache]: Analyzing trace with hash 1936086118, now seen corresponding path program 3 times [2019-11-06 21:23:00,145 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:23:00,145 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1236609350] [2019-11-06 21:23:00,146 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:23:00,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:00,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:00,239 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:23:00,239 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1236609350] [2019-11-06 21:23:00,240 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [634582693] [2019-11-06 21:23:00,240 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 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 [2019-11-06 21:23:00,273 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2019-11-06 21:23:00,273 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:23:00,274 INFO L256 TraceCheckSpWp]: Trace formula consists of 38 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-06 21:23:00,276 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:23:00,314 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 12 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-11-06 21:23:00,314 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:23:00,315 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 4] total 10 [2019-11-06 21:23:00,315 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2092397198] [2019-11-06 21:23:00,316 INFO L442 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-11-06 21:23:00,316 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:23:00,316 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-11-06 21:23:00,320 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2019-11-06 21:23:00,320 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 10 states. [2019-11-06 21:23:00,414 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:23:00,414 INFO L93 Difference]: Finished difference Result 36 states and 43 transitions. [2019-11-06 21:23:00,415 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-11-06 21:23:00,415 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 20 [2019-11-06 21:23:00,416 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:23:00,418 INFO L225 Difference]: With dead ends: 36 [2019-11-06 21:23:00,418 INFO L226 Difference]: Without dead ends: 28 [2019-11-06 21:23:00,419 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2019-11-06 21:23:00,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2019-11-06 21:23:00,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2019-11-06 21:23:00,424 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2019-11-06 21:23:00,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 29 transitions. [2019-11-06 21:23:00,425 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 29 transitions. Word has length 20 [2019-11-06 21:23:00,426 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:23:00,426 INFO L462 AbstractCegarLoop]: Abstraction has 27 states and 29 transitions. [2019-11-06 21:23:00,426 INFO L463 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-11-06 21:23:00,426 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 29 transitions. [2019-11-06 21:23:00,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2019-11-06 21:23:00,427 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:23:00,427 INFO L410 BasicCegarLoop]: trace histogram [8, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:23:00,631 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:23:00,631 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:23:00,632 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:23:00,632 INFO L82 PathProgramCache]: Analyzing trace with hash 375097755, now seen corresponding path program 4 times [2019-11-06 21:23:00,632 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:23:00,633 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [70377214] [2019-11-06 21:23:00,633 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:23:00,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:00,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:00,788 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:23:00,789 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [70377214] [2019-11-06 21:23:00,789 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1870236039] [2019-11-06 21:23:00,789 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:23:00,820 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 21:23:00,820 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:23:00,821 INFO L256 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 8 conjunts are in the unsatisfiable core [2019-11-06 21:23:00,823 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:23:00,831 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 21 proven. 42 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-06 21:23:00,832 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:23:00,832 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9] total 11 [2019-11-06 21:23:00,832 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [129039448] [2019-11-06 21:23:00,833 INFO L442 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-11-06 21:23:00,833 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:23:00,833 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-11-06 21:23:00,834 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2019-11-06 21:23:00,834 INFO L87 Difference]: Start difference. First operand 27 states and 29 transitions. Second operand 11 states. [2019-11-06 21:23:00,885 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:23:00,886 INFO L93 Difference]: Finished difference Result 43 states and 50 transitions. [2019-11-06 21:23:00,886 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-11-06 21:23:00,886 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 26 [2019-11-06 21:23:00,886 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:23:00,887 INFO L225 Difference]: With dead ends: 43 [2019-11-06 21:23:00,887 INFO L226 Difference]: Without dead ends: 33 [2019-11-06 21:23:00,888 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2019-11-06 21:23:00,888 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2019-11-06 21:23:00,893 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2019-11-06 21:23:00,893 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2019-11-06 21:23:00,894 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 35 transitions. [2019-11-06 21:23:00,894 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 35 transitions. Word has length 26 [2019-11-06 21:23:00,895 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:23:00,895 INFO L462 AbstractCegarLoop]: Abstraction has 33 states and 35 transitions. [2019-11-06 21:23:00,895 INFO L463 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-11-06 21:23:00,895 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 35 transitions. [2019-11-06 21:23:00,896 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2019-11-06 21:23:00,896 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:23:00,896 INFO L410 BasicCegarLoop]: trace histogram [11, 9, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:23:01,100 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:23:01,101 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:23:01,101 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:23:01,101 INFO L82 PathProgramCache]: Analyzing trace with hash -943476782, now seen corresponding path program 5 times [2019-11-06 21:23:01,101 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:23:01,102 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1709940485] [2019-11-06 21:23:01,102 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:23:01,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:01,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:01,285 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:23:01,286 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1709940485] [2019-11-06 21:23:01,286 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1155193199] [2019-11-06 21:23:01,286 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:23:01,321 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2019-11-06 21:23:01,321 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:23:01,322 INFO L256 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 11 conjunts are in the unsatisfiable core [2019-11-06 21:23:01,324 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:23:01,343 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 30 proven. 90 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-06 21:23:01,343 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:23:01,343 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12] total 14 [2019-11-06 21:23:01,344 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1497664780] [2019-11-06 21:23:01,344 INFO L442 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-11-06 21:23:01,344 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:23:01,345 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-11-06 21:23:01,345 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2019-11-06 21:23:01,345 INFO L87 Difference]: Start difference. First operand 33 states and 35 transitions. Second operand 14 states. [2019-11-06 21:23:01,413 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:23:01,414 INFO L93 Difference]: Finished difference Result 49 states and 56 transitions. [2019-11-06 21:23:01,416 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-11-06 21:23:01,417 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 32 [2019-11-06 21:23:01,417 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:23:01,417 INFO L225 Difference]: With dead ends: 49 [2019-11-06 21:23:01,418 INFO L226 Difference]: Without dead ends: 39 [2019-11-06 21:23:01,418 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2019-11-06 21:23:01,418 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2019-11-06 21:23:01,423 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2019-11-06 21:23:01,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2019-11-06 21:23:01,424 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 41 transitions. [2019-11-06 21:23:01,425 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 41 transitions. Word has length 32 [2019-11-06 21:23:01,425 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:23:01,425 INFO L462 AbstractCegarLoop]: Abstraction has 39 states and 41 transitions. [2019-11-06 21:23:01,425 INFO L463 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-11-06 21:23:01,425 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 41 transitions. [2019-11-06 21:23:01,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2019-11-06 21:23:01,426 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:23:01,427 INFO L410 BasicCegarLoop]: trace histogram [14, 12, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:23:01,629 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:23:01,630 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:23:01,630 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:23:01,631 INFO L82 PathProgramCache]: Analyzing trace with hash 1433276617, now seen corresponding path program 6 times [2019-11-06 21:23:01,631 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:23:01,632 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1152360605] [2019-11-06 21:23:01,632 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:23:01,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:01,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:01,815 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:23:01,815 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1152360605] [2019-11-06 21:23:01,816 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [637148136] [2019-11-06 21:23:01,816 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE 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 [2019-11-06 21:23:01,855 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 11 check-sat command(s) [2019-11-06 21:23:01,856 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:23:01,857 INFO L256 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 5 conjunts are in the unsatisfiable core [2019-11-06 21:23:01,859 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:23:01,946 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 60 proven. 4 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2019-11-06 21:23:01,946 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:23:01,946 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 5] total 20 [2019-11-06 21:23:01,947 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [21829346] [2019-11-06 21:23:01,947 INFO L442 AbstractCegarLoop]: Interpolant automaton has 20 states [2019-11-06 21:23:01,947 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:23:01,948 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2019-11-06 21:23:01,948 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2019-11-06 21:23:01,948 INFO L87 Difference]: Start difference. First operand 39 states and 41 transitions. Second operand 20 states. [2019-11-06 21:23:02,049 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:23:02,049 INFO L93 Difference]: Finished difference Result 58 states and 68 transitions. [2019-11-06 21:23:02,050 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-11-06 21:23:02,051 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 38 [2019-11-06 21:23:02,051 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:23:02,052 INFO L225 Difference]: With dead ends: 58 [2019-11-06 21:23:02,052 INFO L226 Difference]: Without dead ends: 48 [2019-11-06 21:23:02,052 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2019-11-06 21:23:02,053 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2019-11-06 21:23:02,058 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 47. [2019-11-06 21:23:02,058 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2019-11-06 21:23:02,059 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 50 transitions. [2019-11-06 21:23:02,059 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 50 transitions. Word has length 38 [2019-11-06 21:23:02,059 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:23:02,060 INFO L462 AbstractCegarLoop]: Abstraction has 47 states and 50 transitions. [2019-11-06 21:23:02,060 INFO L463 AbstractCegarLoop]: Interpolant automaton has 20 states. [2019-11-06 21:23:02,060 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 50 transitions. [2019-11-06 21:23:02,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2019-11-06 21:23:02,061 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:23:02,061 INFO L410 BasicCegarLoop]: trace histogram [18, 15, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:23:02,264 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:23:02,265 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:23:02,265 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:23:02,265 INFO L82 PathProgramCache]: Analyzing trace with hash -281181829, now seen corresponding path program 7 times [2019-11-06 21:23:02,266 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:23:02,266 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [724784973] [2019-11-06 21:23:02,266 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:23:02,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:02,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:02,523 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:23:02,523 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [724784973] [2019-11-06 21:23:02,523 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [264477269] [2019-11-06 21:23:02,523 INFO L92 rtionOrderModulation]: Changing assertion order to 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 [2019-11-06 21:23:02,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:02,558 INFO L256 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 17 conjunts are in the unsatisfiable core [2019-11-06 21:23:02,560 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:23:02,574 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 80 proven. 240 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-06 21:23:02,574 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:23:02,575 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 18] total 21 [2019-11-06 21:23:02,575 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1773939791] [2019-11-06 21:23:02,576 INFO L442 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-11-06 21:23:02,576 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:23:02,576 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-11-06 21:23:02,577 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2019-11-06 21:23:02,577 INFO L87 Difference]: Start difference. First operand 47 states and 50 transitions. Second operand 21 states. [2019-11-06 21:23:02,670 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:23:02,671 INFO L93 Difference]: Finished difference Result 67 states and 77 transitions. [2019-11-06 21:23:02,671 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2019-11-06 21:23:02,671 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 46 [2019-11-06 21:23:02,672 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:23:02,672 INFO L225 Difference]: With dead ends: 67 [2019-11-06 21:23:02,672 INFO L226 Difference]: Without dead ends: 55 [2019-11-06 21:23:02,673 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2019-11-06 21:23:02,674 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2019-11-06 21:23:02,679 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2019-11-06 21:23:02,679 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2019-11-06 21:23:02,680 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 58 transitions. [2019-11-06 21:23:02,681 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 58 transitions. Word has length 46 [2019-11-06 21:23:02,681 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:23:02,681 INFO L462 AbstractCegarLoop]: Abstraction has 55 states and 58 transitions. [2019-11-06 21:23:02,681 INFO L463 AbstractCegarLoop]: Interpolant automaton has 21 states. [2019-11-06 21:23:02,682 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 58 transitions. [2019-11-06 21:23:02,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2019-11-06 21:23:02,683 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:23:02,683 INFO L410 BasicCegarLoop]: trace histogram [22, 19, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:23:02,886 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:23:02,887 INFO L410 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:23:02,887 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:23:02,887 INFO L82 PathProgramCache]: Analyzing trace with hash -921805841, now seen corresponding path program 8 times [2019-11-06 21:23:02,888 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:23:02,888 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [795302549] [2019-11-06 21:23:02,889 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:23:02,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:03,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:03,239 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:23:03,239 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [795302549] [2019-11-06 21:23:03,240 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1613097977] [2019-11-06 21:23:03,240 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 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 [2019-11-06 21:23:03,282 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 21:23:03,282 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:23:03,283 INFO L256 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 21 conjunts are in the unsatisfiable core [2019-11-06 21:23:03,286 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:23:03,303 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 100 proven. 380 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-06 21:23:03,303 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:23:03,304 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 22] total 25 [2019-11-06 21:23:03,304 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1491984437] [2019-11-06 21:23:03,304 INFO L442 AbstractCegarLoop]: Interpolant automaton has 25 states [2019-11-06 21:23:03,305 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:23:03,305 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2019-11-06 21:23:03,305 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=300, Invalid=300, Unknown=0, NotChecked=0, Total=600 [2019-11-06 21:23:03,306 INFO L87 Difference]: Start difference. First operand 55 states and 58 transitions. Second operand 25 states. [2019-11-06 21:23:03,413 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:23:03,414 INFO L93 Difference]: Finished difference Result 75 states and 85 transitions. [2019-11-06 21:23:03,415 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2019-11-06 21:23:03,415 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 54 [2019-11-06 21:23:03,416 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:23:03,416 INFO L225 Difference]: With dead ends: 75 [2019-11-06 21:23:03,417 INFO L226 Difference]: Without dead ends: 63 [2019-11-06 21:23:03,417 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=300, Invalid=300, Unknown=0, NotChecked=0, Total=600 [2019-11-06 21:23:03,418 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2019-11-06 21:23:03,423 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2019-11-06 21:23:03,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2019-11-06 21:23:03,424 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 66 transitions. [2019-11-06 21:23:03,425 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 66 transitions. Word has length 54 [2019-11-06 21:23:03,425 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:23:03,425 INFO L462 AbstractCegarLoop]: Abstraction has 63 states and 66 transitions. [2019-11-06 21:23:03,425 INFO L463 AbstractCegarLoop]: Interpolant automaton has 25 states. [2019-11-06 21:23:03,425 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 66 transitions. [2019-11-06 21:23:03,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2019-11-06 21:23:03,426 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:23:03,427 INFO L410 BasicCegarLoop]: trace histogram [26, 23, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:23:03,630 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:23:03,630 INFO L410 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:23:03,630 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:23:03,631 INFO L82 PathProgramCache]: Analyzing trace with hash 1214743139, now seen corresponding path program 9 times [2019-11-06 21:23:03,631 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:23:03,631 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [821973331] [2019-11-06 21:23:03,631 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:23:03,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:04,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:04,054 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:23:04,055 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [821973331] [2019-11-06 21:23:04,055 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [927477057] [2019-11-06 21:23:04,055 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 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 [2019-11-06 21:23:04,088 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2019-11-06 21:23:04,088 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:23:04,089 INFO L256 TraceCheckSpWp]: Trace formula consists of 58 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-06 21:23:04,091 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:23:04,209 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 161 proven. 9 refuted. 0 times theorem prover too weak. 506 trivial. 0 not checked. [2019-11-06 21:23:04,209 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:23:04,209 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 6] total 33 [2019-11-06 21:23:04,210 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [507560633] [2019-11-06 21:23:04,210 INFO L442 AbstractCegarLoop]: Interpolant automaton has 33 states [2019-11-06 21:23:04,210 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:23:04,211 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2019-11-06 21:23:04,212 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=528, Invalid=528, Unknown=0, NotChecked=0, Total=1056 [2019-11-06 21:23:04,212 INFO L87 Difference]: Start difference. First operand 63 states and 66 transitions. Second operand 33 states. [2019-11-06 21:23:04,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:23:04,349 INFO L93 Difference]: Finished difference Result 86 states and 99 transitions. [2019-11-06 21:23:04,349 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2019-11-06 21:23:04,349 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 62 [2019-11-06 21:23:04,349 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:23:04,350 INFO L225 Difference]: With dead ends: 86 [2019-11-06 21:23:04,350 INFO L226 Difference]: Without dead ends: 74 [2019-11-06 21:23:04,351 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=528, Invalid=528, Unknown=0, NotChecked=0, Total=1056 [2019-11-06 21:23:04,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2019-11-06 21:23:04,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2019-11-06 21:23:04,357 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2019-11-06 21:23:04,358 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 77 transitions. [2019-11-06 21:23:04,358 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 77 transitions. Word has length 62 [2019-11-06 21:23:04,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:23:04,359 INFO L462 AbstractCegarLoop]: Abstraction has 73 states and 77 transitions. [2019-11-06 21:23:04,359 INFO L463 AbstractCegarLoop]: Interpolant automaton has 33 states. [2019-11-06 21:23:04,359 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 77 transitions. [2019-11-06 21:23:04,360 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2019-11-06 21:23:04,360 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:23:04,360 INFO L410 BasicCegarLoop]: trace histogram [31, 27, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:23:04,573 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:23:04,574 INFO L410 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:23:04,574 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:23:04,575 INFO L82 PathProgramCache]: Analyzing trace with hash 1553080338, now seen corresponding path program 10 times [2019-11-06 21:23:04,575 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:23:04,575 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [306575671] [2019-11-06 21:23:04,576 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:23:04,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:05,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:05,139 INFO L134 CoverageAnalysis]: Checked inductivity of 961 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:23:05,140 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [306575671] [2019-11-06 21:23:05,140 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [491421995] [2019-11-06 21:23:05,140 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2019-11-06 21:23:05,181 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 21:23:05,181 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:23:05,182 INFO L256 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 29 conjunts are in the unsatisfiable core [2019-11-06 21:23:05,184 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:23:05,206 INFO L134 CoverageAnalysis]: Checked inductivity of 961 backedges. 196 proven. 756 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-11-06 21:23:05,206 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:23:05,206 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 30] total 34 [2019-11-06 21:23:05,206 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1994837464] [2019-11-06 21:23:05,207 INFO L442 AbstractCegarLoop]: Interpolant automaton has 34 states [2019-11-06 21:23:05,207 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:23:05,208 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2019-11-06 21:23:05,208 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=561, Invalid=561, Unknown=0, NotChecked=0, Total=1122 [2019-11-06 21:23:05,208 INFO L87 Difference]: Start difference. First operand 73 states and 77 transitions. Second operand 34 states. [2019-11-06 21:23:05,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:23:05,338 INFO L93 Difference]: Finished difference Result 97 states and 110 transitions. [2019-11-06 21:23:05,338 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2019-11-06 21:23:05,339 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 72 [2019-11-06 21:23:05,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:23:05,340 INFO L225 Difference]: With dead ends: 97 [2019-11-06 21:23:05,340 INFO L226 Difference]: Without dead ends: 83 [2019-11-06 21:23:05,341 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=561, Invalid=561, Unknown=0, NotChecked=0, Total=1122 [2019-11-06 21:23:05,342 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2019-11-06 21:23:05,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 83. [2019-11-06 21:23:05,349 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2019-11-06 21:23:05,350 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 87 transitions. [2019-11-06 21:23:05,350 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 87 transitions. Word has length 72 [2019-11-06 21:23:05,351 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:23:05,351 INFO L462 AbstractCegarLoop]: Abstraction has 83 states and 87 transitions. [2019-11-06 21:23:05,351 INFO L463 AbstractCegarLoop]: Interpolant automaton has 34 states. [2019-11-06 21:23:05,351 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 87 transitions. [2019-11-06 21:23:05,352 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2019-11-06 21:23:05,352 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:23:05,352 INFO L410 BasicCegarLoop]: trace histogram [36, 32, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:23:05,556 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:23:05,556 INFO L410 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:23:05,557 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:23:05,557 INFO L82 PathProgramCache]: Analyzing trace with hash -1054393917, now seen corresponding path program 11 times [2019-11-06 21:23:05,557 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:23:05,558 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1540804342] [2019-11-06 21:23:05,558 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:23:05,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:06,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:06,215 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 0 proven. 1296 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:23:06,215 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1540804342] [2019-11-06 21:23:06,215 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1462758311] [2019-11-06 21:23:06,215 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 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 [2019-11-06 21:23:06,309 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 37 check-sat command(s) [2019-11-06 21:23:06,310 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:23:06,312 INFO L256 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 34 conjunts are in the unsatisfiable core [2019-11-06 21:23:06,314 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:23:06,350 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 231 proven. 1056 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-11-06 21:23:06,350 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:23:06,350 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 35] total 39 [2019-11-06 21:23:06,351 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [310054809] [2019-11-06 21:23:06,353 INFO L442 AbstractCegarLoop]: Interpolant automaton has 39 states [2019-11-06 21:23:06,353 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:23:06,354 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2019-11-06 21:23:06,355 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=741, Invalid=741, Unknown=0, NotChecked=0, Total=1482 [2019-11-06 21:23:06,355 INFO L87 Difference]: Start difference. First operand 83 states and 87 transitions. Second operand 39 states. [2019-11-06 21:23:06,502 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:23:06,502 INFO L93 Difference]: Finished difference Result 107 states and 120 transitions. [2019-11-06 21:23:06,502 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2019-11-06 21:23:06,502 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 82 [2019-11-06 21:23:06,503 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:23:06,503 INFO L225 Difference]: With dead ends: 107 [2019-11-06 21:23:06,504 INFO L226 Difference]: Without dead ends: 93 [2019-11-06 21:23:06,505 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 85 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=741, Invalid=741, Unknown=0, NotChecked=0, Total=1482 [2019-11-06 21:23:06,506 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2019-11-06 21:23:06,515 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 93. [2019-11-06 21:23:06,515 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2019-11-06 21:23:06,516 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 97 transitions. [2019-11-06 21:23:06,516 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 97 transitions. Word has length 82 [2019-11-06 21:23:06,517 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:23:06,517 INFO L462 AbstractCegarLoop]: Abstraction has 93 states and 97 transitions. [2019-11-06 21:23:06,517 INFO L463 AbstractCegarLoop]: Interpolant automaton has 39 states. [2019-11-06 21:23:06,517 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 97 transitions. [2019-11-06 21:23:06,524 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2019-11-06 21:23:06,524 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:23:06,524 INFO L410 BasicCegarLoop]: trace histogram [41, 37, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:23:06,736 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:23:06,736 INFO L410 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:23:06,737 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:23:06,737 INFO L82 PathProgramCache]: Analyzing trace with hash 1997580852, now seen corresponding path program 12 times [2019-11-06 21:23:06,737 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:23:06,738 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1634692260] [2019-11-06 21:23:06,738 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:23:06,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:07,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:07,740 INFO L134 CoverageAnalysis]: Checked inductivity of 1681 backedges. 0 proven. 1681 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:23:07,741 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1634692260] [2019-11-06 21:23:07,741 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [995807383] [2019-11-06 21:23:07,741 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE 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 [2019-11-06 21:23:07,800 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2019-11-06 21:23:07,800 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:23:07,801 INFO L256 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 7 conjunts are in the unsatisfiable core [2019-11-06 21:23:07,803 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:23:08,041 INFO L134 CoverageAnalysis]: Checked inductivity of 1681 backedges. 333 proven. 16 refuted. 0 times theorem prover too weak. 1332 trivial. 0 not checked. [2019-11-06 21:23:08,042 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:23:08,042 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 7] total 49 [2019-11-06 21:23:08,042 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [907793062] [2019-11-06 21:23:08,043 INFO L442 AbstractCegarLoop]: Interpolant automaton has 49 states [2019-11-06 21:23:08,043 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:23:08,044 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2019-11-06 21:23:08,044 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1176, Invalid=1176, Unknown=0, NotChecked=0, Total=2352 [2019-11-06 21:23:08,045 INFO L87 Difference]: Start difference. First operand 93 states and 97 transitions. Second operand 49 states. [2019-11-06 21:23:08,256 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:23:08,257 INFO L93 Difference]: Finished difference Result 120 states and 136 transitions. [2019-11-06 21:23:08,257 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2019-11-06 21:23:08,257 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 92 [2019-11-06 21:23:08,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:23:08,258 INFO L225 Difference]: With dead ends: 120 [2019-11-06 21:23:08,259 INFO L226 Difference]: Without dead ends: 106 [2019-11-06 21:23:08,260 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 90 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1176, Invalid=1176, Unknown=0, NotChecked=0, Total=2352 [2019-11-06 21:23:08,260 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2019-11-06 21:23:08,267 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 105. [2019-11-06 21:23:08,267 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2019-11-06 21:23:08,268 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 110 transitions. [2019-11-06 21:23:08,268 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 110 transitions. Word has length 92 [2019-11-06 21:23:08,268 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:23:08,268 INFO L462 AbstractCegarLoop]: Abstraction has 105 states and 110 transitions. [2019-11-06 21:23:08,268 INFO L463 AbstractCegarLoop]: Interpolant automaton has 49 states. [2019-11-06 21:23:08,269 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 110 transitions. [2019-11-06 21:23:08,270 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2019-11-06 21:23:08,270 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:23:08,270 INFO L410 BasicCegarLoop]: trace histogram [47, 42, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:23:08,473 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:23:08,474 INFO L410 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:23:08,474 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:23:08,474 INFO L82 PathProgramCache]: Analyzing trace with hash -228245216, now seen corresponding path program 13 times [2019-11-06 21:23:08,475 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:23:08,475 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [12934732] [2019-11-06 21:23:08,475 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:23:08,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:09,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:09,610 INFO L134 CoverageAnalysis]: Checked inductivity of 2209 backedges. 0 proven. 2209 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:23:09,611 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [12934732] [2019-11-06 21:23:09,611 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [360401499] [2019-11-06 21:23:09,611 INFO L92 rtionOrderModulation]: Changing assertion order to 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 [2019-11-06 21:23:09,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:09,665 INFO L256 TraceCheckSpWp]: Trace formula consists of 222 conjuncts, 44 conjunts are in the unsatisfiable core [2019-11-06 21:23:09,677 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:23:09,738 INFO L134 CoverageAnalysis]: Checked inductivity of 2209 backedges. 387 proven. 1806 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-11-06 21:23:09,743 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:23:09,743 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 45] total 50 [2019-11-06 21:23:09,744 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2077778071] [2019-11-06 21:23:09,744 INFO L442 AbstractCegarLoop]: Interpolant automaton has 50 states [2019-11-06 21:23:09,744 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:23:09,745 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2019-11-06 21:23:09,746 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1225, Invalid=1225, Unknown=0, NotChecked=0, Total=2450 [2019-11-06 21:23:09,746 INFO L87 Difference]: Start difference. First operand 105 states and 110 transitions. Second operand 50 states. [2019-11-06 21:23:09,990 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:23:09,990 INFO L93 Difference]: Finished difference Result 133 states and 149 transitions. [2019-11-06 21:23:09,991 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2019-11-06 21:23:09,991 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 104 [2019-11-06 21:23:09,992 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:23:09,993 INFO L225 Difference]: With dead ends: 133 [2019-11-06 21:23:09,993 INFO L226 Difference]: Without dead ends: 117 [2019-11-06 21:23:09,994 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 107 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1225, Invalid=1225, Unknown=0, NotChecked=0, Total=2450 [2019-11-06 21:23:09,995 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2019-11-06 21:23:10,001 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 117. [2019-11-06 21:23:10,001 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 117 states. [2019-11-06 21:23:10,002 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 122 transitions. [2019-11-06 21:23:10,002 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 122 transitions. Word has length 104 [2019-11-06 21:23:10,003 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:23:10,003 INFO L462 AbstractCegarLoop]: Abstraction has 117 states and 122 transitions. [2019-11-06 21:23:10,003 INFO L463 AbstractCegarLoop]: Interpolant automaton has 50 states. [2019-11-06 21:23:10,003 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 122 transitions. [2019-11-06 21:23:10,004 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2019-11-06 21:23:10,004 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:23:10,004 INFO L410 BasicCegarLoop]: trace histogram [53, 48, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:23:10,207 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:23:10,208 INFO L410 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:23:10,208 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:23:10,209 INFO L82 PathProgramCache]: Analyzing trace with hash -1298124850, now seen corresponding path program 14 times [2019-11-06 21:23:10,209 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:23:10,209 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [953939713] [2019-11-06 21:23:10,210 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:23:10,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:11,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:11,518 INFO L134 CoverageAnalysis]: Checked inductivity of 2809 backedges. 0 proven. 2809 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:23:11,518 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [953939713] [2019-11-06 21:23:11,519 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [563192863] [2019-11-06 21:23:11,519 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 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 [2019-11-06 21:23:11,577 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 21:23:11,578 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:23:11,579 INFO L256 TraceCheckSpWp]: Trace formula consists of 246 conjuncts, 50 conjunts are in the unsatisfiable core [2019-11-06 21:23:11,581 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:23:11,619 INFO L134 CoverageAnalysis]: Checked inductivity of 2809 backedges. 441 proven. 2352 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-11-06 21:23:11,620 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:23:11,620 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 51] total 56 [2019-11-06 21:23:11,620 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [377083621] [2019-11-06 21:23:11,621 INFO L442 AbstractCegarLoop]: Interpolant automaton has 56 states [2019-11-06 21:23:11,621 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:23:11,621 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2019-11-06 21:23:11,622 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1540, Invalid=1540, Unknown=0, NotChecked=0, Total=3080 [2019-11-06 21:23:11,623 INFO L87 Difference]: Start difference. First operand 117 states and 122 transitions. Second operand 56 states. [2019-11-06 21:23:11,899 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:23:11,899 INFO L93 Difference]: Finished difference Result 137 states and 149 transitions. [2019-11-06 21:23:11,900 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2019-11-06 21:23:11,900 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 116 [2019-11-06 21:23:11,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:23:11,901 INFO L225 Difference]: With dead ends: 137 [2019-11-06 21:23:11,901 INFO L226 Difference]: Without dead ends: 121 [2019-11-06 21:23:11,903 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 119 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1540, Invalid=1540, Unknown=0, NotChecked=0, Total=3080 [2019-11-06 21:23:11,903 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2019-11-06 21:23:11,908 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 121. [2019-11-06 21:23:11,908 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 121 states. [2019-11-06 21:23:11,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 126 transitions. [2019-11-06 21:23:11,909 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 126 transitions. Word has length 116 [2019-11-06 21:23:11,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:23:11,910 INFO L462 AbstractCegarLoop]: Abstraction has 121 states and 126 transitions. [2019-11-06 21:23:11,910 INFO L463 AbstractCegarLoop]: Interpolant automaton has 56 states. [2019-11-06 21:23:11,910 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 126 transitions. [2019-11-06 21:23:11,911 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2019-11-06 21:23:11,911 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:23:11,911 INFO L410 BasicCegarLoop]: trace histogram [55, 50, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:23:12,114 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:23:12,115 INFO L410 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:23:12,115 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:23:12,115 INFO L82 PathProgramCache]: Analyzing trace with hash -942616568, now seen corresponding path program 15 times [2019-11-06 21:23:12,115 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:23:12,115 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1032373479] [2019-11-06 21:23:12,115 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:23:12,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:13,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:13,348 INFO L134 CoverageAnalysis]: Checked inductivity of 3025 backedges. 0 proven. 3025 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:23:13,348 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1032373479] [2019-11-06 21:23:13,348 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1742804201] [2019-11-06 21:23:13,349 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:23:13,396 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2019-11-06 21:23:13,396 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:23:13,397 INFO L256 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 8 conjunts are in the unsatisfiable core [2019-11-06 21:23:13,398 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:23:13,410 INFO L134 CoverageAnalysis]: Checked inductivity of 3025 backedges. 550 proven. 25 refuted. 0 times theorem prover too weak. 2450 trivial. 0 not checked. [2019-11-06 21:23:13,410 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:23:13,411 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 8] total 58 [2019-11-06 21:23:13,411 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1150520319] [2019-11-06 21:23:13,411 INFO L442 AbstractCegarLoop]: Interpolant automaton has 58 states [2019-11-06 21:23:13,412 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:23:13,412 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2019-11-06 21:23:13,413 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1653, Invalid=1653, Unknown=0, NotChecked=0, Total=3306 [2019-11-06 21:23:13,413 INFO L87 Difference]: Start difference. First operand 121 states and 126 transitions. Second operand 58 states. [2019-11-06 21:23:13,681 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:23:13,682 INFO L93 Difference]: Finished difference Result 129 states and 136 transitions. [2019-11-06 21:23:13,682 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2019-11-06 21:23:13,682 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 120 [2019-11-06 21:23:13,682 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:23:13,683 INFO L225 Difference]: With dead ends: 129 [2019-11-06 21:23:13,683 INFO L226 Difference]: Without dead ends: 124 [2019-11-06 21:23:13,685 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 179 GetRequests, 123 SyntacticMatches, 0 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1653, Invalid=1653, Unknown=0, NotChecked=0, Total=3306 [2019-11-06 21:23:13,686 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2019-11-06 21:23:13,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 123. [2019-11-06 21:23:13,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 123 states. [2019-11-06 21:23:13,690 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 129 transitions. [2019-11-06 21:23:13,690 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 129 transitions. Word has length 120 [2019-11-06 21:23:13,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:23:13,691 INFO L462 AbstractCegarLoop]: Abstraction has 123 states and 129 transitions. [2019-11-06 21:23:13,691 INFO L463 AbstractCegarLoop]: Interpolant automaton has 58 states. [2019-11-06 21:23:13,691 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 129 transitions. [2019-11-06 21:23:13,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2019-11-06 21:23:13,692 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:23:13,693 INFO L410 BasicCegarLoop]: trace histogram [56, 50, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:23:13,896 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:23:13,896 INFO L410 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:23:13,896 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:23:13,897 INFO L82 PathProgramCache]: Analyzing trace with hash 1486615299, now seen corresponding path program 16 times [2019-11-06 21:23:13,897 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:23:13,897 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1892417447] [2019-11-06 21:23:13,897 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:23:13,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:15,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:15,149 INFO L134 CoverageAnalysis]: Checked inductivity of 3136 backedges. 0 proven. 3136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:23:15,150 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1892417447] [2019-11-06 21:23:15,150 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2107766575] [2019-11-06 21:23:15,150 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:23:15,216 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 21:23:15,216 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:23:15,218 INFO L256 TraceCheckSpWp]: Trace formula consists of 260 conjuncts, 58 conjunts are in the unsatisfiable core [2019-11-06 21:23:15,220 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:23:15,250 INFO L134 CoverageAnalysis]: Checked inductivity of 3136 backedges. 0 proven. 3136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:23:15,251 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:23:15,251 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59] total 59 [2019-11-06 21:23:15,251 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1898792564] [2019-11-06 21:23:15,252 INFO L442 AbstractCegarLoop]: Interpolant automaton has 59 states [2019-11-06 21:23:15,252 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:23:15,252 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2019-11-06 21:23:15,253 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1711, Invalid=1711, Unknown=0, NotChecked=0, Total=3422 [2019-11-06 21:23:15,254 INFO L87 Difference]: Start difference. First operand 123 states and 129 transitions. Second operand 59 states. [2019-11-06 21:23:15,527 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:23:15,527 INFO L93 Difference]: Finished difference Result 131 states and 139 transitions. [2019-11-06 21:23:15,528 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2019-11-06 21:23:15,528 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 122 [2019-11-06 21:23:15,528 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:23:15,529 INFO L225 Difference]: With dead ends: 131 [2019-11-06 21:23:15,529 INFO L226 Difference]: Without dead ends: 126 [2019-11-06 21:23:15,530 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 125 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1711, Invalid=1711, Unknown=0, NotChecked=0, Total=3422 [2019-11-06 21:23:15,530 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2019-11-06 21:23:15,534 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 125. [2019-11-06 21:23:15,534 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 125 states. [2019-11-06 21:23:15,535 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 132 transitions. [2019-11-06 21:23:15,535 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 132 transitions. Word has length 122 [2019-11-06 21:23:15,535 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:23:15,535 INFO L462 AbstractCegarLoop]: Abstraction has 125 states and 132 transitions. [2019-11-06 21:23:15,536 INFO L463 AbstractCegarLoop]: Interpolant automaton has 59 states. [2019-11-06 21:23:15,536 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 132 transitions. [2019-11-06 21:23:15,537 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2019-11-06 21:23:15,537 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:23:15,537 INFO L410 BasicCegarLoop]: trace histogram [57, 50, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:23:15,740 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:23:15,740 INFO L410 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:23:15,741 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:23:15,741 INFO L82 PathProgramCache]: Analyzing trace with hash -483769538, now seen corresponding path program 17 times [2019-11-06 21:23:15,741 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:23:15,741 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1826099011] [2019-11-06 21:23:15,742 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:23:15,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:17,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:17,233 INFO L134 CoverageAnalysis]: Checked inductivity of 3249 backedges. 0 proven. 3249 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:23:17,233 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1826099011] [2019-11-06 21:23:17,233 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [888131602] [2019-11-06 21:23:17,234 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:23:17,352 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 58 check-sat command(s) [2019-11-06 21:23:17,352 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:23:17,354 INFO L256 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 31 conjunts are in the unsatisfiable core [2019-11-06 21:23:17,356 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:23:18,373 INFO L134 CoverageAnalysis]: Checked inductivity of 3249 backedges. 1653 proven. 784 refuted. 0 times theorem prover too weak. 812 trivial. 0 not checked. [2019-11-06 21:23:18,374 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:23:18,374 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 31] total 81 [2019-11-06 21:23:18,374 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [459966461] [2019-11-06 21:23:18,374 INFO L442 AbstractCegarLoop]: Interpolant automaton has 81 states [2019-11-06 21:23:18,375 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:23:18,375 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 81 interpolants. [2019-11-06 21:23:18,377 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3240, Invalid=3240, Unknown=0, NotChecked=0, Total=6480 [2019-11-06 21:23:18,377 INFO L87 Difference]: Start difference. First operand 125 states and 132 transitions. Second operand 81 states. [2019-11-06 21:23:18,793 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:23:18,793 INFO L93 Difference]: Finished difference Result 175 states and 226 transitions. [2019-11-06 21:23:18,795 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2019-11-06 21:23:18,795 INFO L78 Accepts]: Start accepts. Automaton has 81 states. Word has length 124 [2019-11-06 21:23:18,796 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:23:18,797 INFO L225 Difference]: With dead ends: 175 [2019-11-06 21:23:18,797 INFO L226 Difference]: Without dead ends: 170 [2019-11-06 21:23:18,799 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 185 GetRequests, 106 SyntacticMatches, 0 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=3240, Invalid=3240, Unknown=0, NotChecked=0, Total=6480 [2019-11-06 21:23:18,800 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2019-11-06 21:23:18,804 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 169. [2019-11-06 21:23:18,805 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 169 states. [2019-11-06 21:23:18,805 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 198 transitions. [2019-11-06 21:23:18,806 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 198 transitions. Word has length 124 [2019-11-06 21:23:18,806 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:23:18,806 INFO L462 AbstractCegarLoop]: Abstraction has 169 states and 198 transitions. [2019-11-06 21:23:18,806 INFO L463 AbstractCegarLoop]: Interpolant automaton has 81 states. [2019-11-06 21:23:18,806 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 198 transitions. [2019-11-06 21:23:18,807 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 169 [2019-11-06 21:23:18,808 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:23:18,808 INFO L410 BasicCegarLoop]: trace histogram [79, 50, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:23:19,011 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:23:19,011 INFO L410 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:23:19,011 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:23:19,012 INFO L82 PathProgramCache]: Analyzing trace with hash 529031312, now seen corresponding path program 18 times [2019-11-06 21:23:19,012 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:23:19,012 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [607434753] [2019-11-06 21:23:19,013 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:23:19,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:21,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:21,308 INFO L134 CoverageAnalysis]: Checked inductivity of 6241 backedges. 0 proven. 6241 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:23:21,309 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [607434753] [2019-11-06 21:23:21,309 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1844942934] [2019-11-06 21:23:21,309 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:23:21,490 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 79 check-sat command(s) [2019-11-06 21:23:21,490 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:23:21,491 INFO L256 TraceCheckSpWp]: Trace formula consists of 394 conjuncts, 42 conjunts are in the unsatisfiable core [2019-11-06 21:23:21,494 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:23:22,089 INFO L134 CoverageAnalysis]: Checked inductivity of 6241 backedges. 3160 proven. 1521 refuted. 0 times theorem prover too weak. 1560 trivial. 0 not checked. [2019-11-06 21:23:22,089 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:23:22,089 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [82, 42] total 92 [2019-11-06 21:23:22,089 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1171428007] [2019-11-06 21:23:22,091 INFO L442 AbstractCegarLoop]: Interpolant automaton has 92 states [2019-11-06 21:23:22,091 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:23:22,093 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 92 interpolants. [2019-11-06 21:23:22,096 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4186, Invalid=4186, Unknown=0, NotChecked=0, Total=8372 [2019-11-06 21:23:22,096 INFO L87 Difference]: Start difference. First operand 169 states and 198 transitions. Second operand 92 states. [2019-11-06 21:23:22,874 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:23:22,874 INFO L93 Difference]: Finished difference Result 197 states and 248 transitions. [2019-11-06 21:23:22,874 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 92 states. [2019-11-06 21:23:22,874 INFO L78 Accepts]: Start accepts. Automaton has 92 states. Word has length 168 [2019-11-06 21:23:22,875 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:23:22,876 INFO L225 Difference]: With dead ends: 197 [2019-11-06 21:23:22,876 INFO L226 Difference]: Without dead ends: 192 [2019-11-06 21:23:22,877 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 251 GetRequests, 161 SyntacticMatches, 0 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=4186, Invalid=4186, Unknown=0, NotChecked=0, Total=8372 [2019-11-06 21:23:22,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 192 states. [2019-11-06 21:23:22,881 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 192 to 191. [2019-11-06 21:23:22,881 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 191 states. [2019-11-06 21:23:22,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 191 states to 191 states and 231 transitions. [2019-11-06 21:23:22,882 INFO L78 Accepts]: Start accepts. Automaton has 191 states and 231 transitions. Word has length 168 [2019-11-06 21:23:22,882 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:23:22,882 INFO L462 AbstractCegarLoop]: Abstraction has 191 states and 231 transitions. [2019-11-06 21:23:22,882 INFO L463 AbstractCegarLoop]: Interpolant automaton has 92 states. [2019-11-06 21:23:22,883 INFO L276 IsEmpty]: Start isEmpty. Operand 191 states and 231 transitions. [2019-11-06 21:23:22,884 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2019-11-06 21:23:22,884 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:23:22,884 INFO L410 BasicCegarLoop]: trace histogram [90, 50, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:23:23,087 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:23:23,088 INFO L410 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:23:23,088 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:23:23,088 INFO L82 PathProgramCache]: Analyzing trace with hash 979727385, now seen corresponding path program 19 times [2019-11-06 21:23:23,089 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:23:23,089 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1550970406] [2019-11-06 21:23:23,089 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:23:23,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:26,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:26,164 INFO L134 CoverageAnalysis]: Checked inductivity of 8100 backedges. 0 proven. 8100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:23:26,164 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1550970406] [2019-11-06 21:23:26,165 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1975166363] [2019-11-06 21:23:26,165 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:23:26,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:26,274 INFO L256 TraceCheckSpWp]: Trace formula consists of 464 conjuncts, 92 conjunts are in the unsatisfiable core [2019-11-06 21:23:26,277 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:23:26,332 INFO L134 CoverageAnalysis]: Checked inductivity of 8100 backedges. 0 proven. 8100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:23:26,332 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:23:26,332 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [93, 93] total 93 [2019-11-06 21:23:26,332 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1890668304] [2019-11-06 21:23:26,333 INFO L442 AbstractCegarLoop]: Interpolant automaton has 93 states [2019-11-06 21:23:26,333 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:23:26,333 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 93 interpolants. [2019-11-06 21:23:26,334 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4278, Invalid=4278, Unknown=0, NotChecked=0, Total=8556 [2019-11-06 21:23:26,334 INFO L87 Difference]: Start difference. First operand 191 states and 231 transitions. Second operand 93 states. [2019-11-06 21:23:27,007 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:23:27,007 INFO L93 Difference]: Finished difference Result 199 states and 241 transitions. [2019-11-06 21:23:27,009 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 93 states. [2019-11-06 21:23:27,009 INFO L78 Accepts]: Start accepts. Automaton has 93 states. Word has length 190 [2019-11-06 21:23:27,009 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:23:27,010 INFO L225 Difference]: With dead ends: 199 [2019-11-06 21:23:27,010 INFO L226 Difference]: Without dead ends: 194 [2019-11-06 21:23:27,011 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 284 GetRequests, 193 SyntacticMatches, 0 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=4278, Invalid=4278, Unknown=0, NotChecked=0, Total=8556 [2019-11-06 21:23:27,011 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2019-11-06 21:23:27,017 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 193. [2019-11-06 21:23:27,017 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 193 states. [2019-11-06 21:23:27,018 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 193 states and 234 transitions. [2019-11-06 21:23:27,018 INFO L78 Accepts]: Start accepts. Automaton has 193 states and 234 transitions. Word has length 190 [2019-11-06 21:23:27,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:23:27,019 INFO L462 AbstractCegarLoop]: Abstraction has 193 states and 234 transitions. [2019-11-06 21:23:27,019 INFO L463 AbstractCegarLoop]: Interpolant automaton has 93 states. [2019-11-06 21:23:27,019 INFO L276 IsEmpty]: Start isEmpty. Operand 193 states and 234 transitions. [2019-11-06 21:23:27,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 193 [2019-11-06 21:23:27,020 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:23:27,021 INFO L410 BasicCegarLoop]: trace histogram [91, 50, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:23:27,224 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:23:27,224 INFO L410 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:23:27,225 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:23:27,225 INFO L82 PathProgramCache]: Analyzing trace with hash 2023216852, now seen corresponding path program 20 times [2019-11-06 21:23:27,225 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:23:27,225 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1161789910] [2019-11-06 21:23:27,226 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:23:27,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:30,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:30,799 INFO L134 CoverageAnalysis]: Checked inductivity of 8281 backedges. 0 proven. 8281 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:23:30,799 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1161789910] [2019-11-06 21:23:30,800 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1129231255] [2019-11-06 21:23:30,800 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:23:30,907 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 21:23:30,907 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:23:30,909 INFO L256 TraceCheckSpWp]: Trace formula consists of 470 conjuncts, 93 conjunts are in the unsatisfiable core [2019-11-06 21:23:30,912 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:23:30,972 INFO L134 CoverageAnalysis]: Checked inductivity of 8281 backedges. 0 proven. 8281 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:23:30,973 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:23:30,973 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [94, 94] total 94 [2019-11-06 21:23:30,973 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1110274593] [2019-11-06 21:23:30,974 INFO L442 AbstractCegarLoop]: Interpolant automaton has 94 states [2019-11-06 21:23:30,974 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:23:30,975 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 94 interpolants. [2019-11-06 21:23:30,975 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4371, Invalid=4371, Unknown=0, NotChecked=0, Total=8742 [2019-11-06 21:23:30,975 INFO L87 Difference]: Start difference. First operand 193 states and 234 transitions. Second operand 94 states. [2019-11-06 21:23:31,778 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:23:31,778 INFO L93 Difference]: Finished difference Result 201 states and 244 transitions. [2019-11-06 21:23:31,778 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2019-11-06 21:23:31,778 INFO L78 Accepts]: Start accepts. Automaton has 94 states. Word has length 192 [2019-11-06 21:23:31,779 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:23:31,781 INFO L225 Difference]: With dead ends: 201 [2019-11-06 21:23:31,782 INFO L226 Difference]: Without dead ends: 196 [2019-11-06 21:23:31,782 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 287 GetRequests, 195 SyntacticMatches, 0 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=4371, Invalid=4371, Unknown=0, NotChecked=0, Total=8742 [2019-11-06 21:23:31,783 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2019-11-06 21:23:31,788 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 195. [2019-11-06 21:23:31,788 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 195 states. [2019-11-06 21:23:31,789 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 195 states to 195 states and 237 transitions. [2019-11-06 21:23:31,789 INFO L78 Accepts]: Start accepts. Automaton has 195 states and 237 transitions. Word has length 192 [2019-11-06 21:23:31,789 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:23:31,789 INFO L462 AbstractCegarLoop]: Abstraction has 195 states and 237 transitions. [2019-11-06 21:23:31,789 INFO L463 AbstractCegarLoop]: Interpolant automaton has 94 states. [2019-11-06 21:23:31,790 INFO L276 IsEmpty]: Start isEmpty. Operand 195 states and 237 transitions. [2019-11-06 21:23:31,790 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 195 [2019-11-06 21:23:31,791 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:23:31,791 INFO L410 BasicCegarLoop]: trace histogram [92, 50, 42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:23:31,994 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:23:31,994 INFO L410 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:23:31,995 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:23:31,995 INFO L82 PathProgramCache]: Analyzing trace with hash -205752625, now seen corresponding path program 21 times [2019-11-06 21:23:31,996 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:23:31,996 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [448984706] [2019-11-06 21:23:31,996 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:23:32,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:35,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:35,068 INFO L134 CoverageAnalysis]: Checked inductivity of 8464 backedges. 0 proven. 8464 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:23:35,069 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [448984706] [2019-11-06 21:23:35,069 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1270400018] [2019-11-06 21:23:35,069 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:23:35,289 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 86 check-sat command(s) [2019-11-06 21:23:35,289 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:23:35,291 INFO L256 TraceCheckSpWp]: Trace formula consists of 448 conjuncts, 45 conjunts are in the unsatisfiable core [2019-11-06 21:23:35,294 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:23:35,329 INFO L134 CoverageAnalysis]: Checked inductivity of 8464 backedges. 4250 proven. 1764 refuted. 0 times theorem prover too weak. 2450 trivial. 0 not checked. [2019-11-06 21:23:35,329 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:23:35,330 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [95, 45] total 95 [2019-11-06 21:23:35,330 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [596666653] [2019-11-06 21:23:35,330 INFO L442 AbstractCegarLoop]: Interpolant automaton has 95 states [2019-11-06 21:23:35,331 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:23:35,331 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 95 interpolants. [2019-11-06 21:23:35,332 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4465, Invalid=4465, Unknown=0, NotChecked=0, Total=8930 [2019-11-06 21:23:35,332 INFO L87 Difference]: Start difference. First operand 195 states and 237 transitions. Second operand 95 states. [2019-11-06 21:23:36,066 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:23:36,066 INFO L93 Difference]: Finished difference Result 203 states and 247 transitions. [2019-11-06 21:23:36,066 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 95 states. [2019-11-06 21:23:36,066 INFO L78 Accepts]: Start accepts. Automaton has 95 states. Word has length 194 [2019-11-06 21:23:36,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:23:36,068 INFO L225 Difference]: With dead ends: 203 [2019-11-06 21:23:36,068 INFO L226 Difference]: Without dead ends: 198 [2019-11-06 21:23:36,069 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 290 GetRequests, 197 SyntacticMatches, 0 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=4465, Invalid=4465, Unknown=0, NotChecked=0, Total=8930 [2019-11-06 21:23:36,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 198 states. [2019-11-06 21:23:36,074 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 198 to 197. [2019-11-06 21:23:36,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 197 states. [2019-11-06 21:23:36,075 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 197 states to 197 states and 240 transitions. [2019-11-06 21:23:36,075 INFO L78 Accepts]: Start accepts. Automaton has 197 states and 240 transitions. Word has length 194 [2019-11-06 21:23:36,075 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:23:36,075 INFO L462 AbstractCegarLoop]: Abstraction has 197 states and 240 transitions. [2019-11-06 21:23:36,075 INFO L463 AbstractCegarLoop]: Interpolant automaton has 95 states. [2019-11-06 21:23:36,076 INFO L276 IsEmpty]: Start isEmpty. Operand 197 states and 240 transitions. [2019-11-06 21:23:36,077 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 197 [2019-11-06 21:23:36,077 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:23:36,077 INFO L410 BasicCegarLoop]: trace histogram [93, 50, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:23:36,280 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:23:36,280 INFO L410 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:23:36,281 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:23:36,281 INFO L82 PathProgramCache]: Analyzing trace with hash 943260682, now seen corresponding path program 22 times [2019-11-06 21:23:36,281 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:23:36,281 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1766627397] [2019-11-06 21:23:36,282 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:23:36,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:39,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:39,404 INFO L134 CoverageAnalysis]: Checked inductivity of 8649 backedges. 0 proven. 8649 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:23:39,404 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1766627397] [2019-11-06 21:23:39,404 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [196029249] [2019-11-06 21:23:39,405 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:23:39,533 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 21:23:39,533 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:23:39,535 INFO L256 TraceCheckSpWp]: Trace formula consists of 482 conjuncts, 95 conjunts are in the unsatisfiable core [2019-11-06 21:23:39,538 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:23:39,603 INFO L134 CoverageAnalysis]: Checked inductivity of 8649 backedges. 0 proven. 8649 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:23:39,603 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:23:39,604 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [96, 96] total 96 [2019-11-06 21:23:39,604 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1352883419] [2019-11-06 21:23:39,604 INFO L442 AbstractCegarLoop]: Interpolant automaton has 96 states [2019-11-06 21:23:39,604 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:23:39,605 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants. [2019-11-06 21:23:39,605 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4560, Invalid=4560, Unknown=0, NotChecked=0, Total=9120 [2019-11-06 21:23:39,605 INFO L87 Difference]: Start difference. First operand 197 states and 240 transitions. Second operand 96 states. [2019-11-06 21:23:40,952 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:23:40,952 INFO L93 Difference]: Finished difference Result 205 states and 250 transitions. [2019-11-06 21:23:40,952 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2019-11-06 21:23:40,952 INFO L78 Accepts]: Start accepts. Automaton has 96 states. Word has length 196 [2019-11-06 21:23:40,953 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:23:40,954 INFO L225 Difference]: With dead ends: 205 [2019-11-06 21:23:40,954 INFO L226 Difference]: Without dead ends: 200 [2019-11-06 21:23:40,955 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 293 GetRequests, 199 SyntacticMatches, 0 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=4560, Invalid=4560, Unknown=0, NotChecked=0, Total=9120 [2019-11-06 21:23:40,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 200 states. [2019-11-06 21:23:40,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 200 to 199. [2019-11-06 21:23:40,960 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 199 states. [2019-11-06 21:23:40,961 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 199 states to 199 states and 243 transitions. [2019-11-06 21:23:40,961 INFO L78 Accepts]: Start accepts. Automaton has 199 states and 243 transitions. Word has length 196 [2019-11-06 21:23:40,961 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:23:40,961 INFO L462 AbstractCegarLoop]: Abstraction has 199 states and 243 transitions. [2019-11-06 21:23:40,961 INFO L463 AbstractCegarLoop]: Interpolant automaton has 96 states. [2019-11-06 21:23:40,961 INFO L276 IsEmpty]: Start isEmpty. Operand 199 states and 243 transitions. [2019-11-06 21:23:40,962 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 199 [2019-11-06 21:23:40,963 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:23:40,963 INFO L410 BasicCegarLoop]: trace histogram [94, 50, 44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:23:41,166 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:23:41,166 INFO L410 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:23:41,167 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:23:41,167 INFO L82 PathProgramCache]: Analyzing trace with hash 1338453637, now seen corresponding path program 23 times [2019-11-06 21:23:41,167 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:23:41,167 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1104066696] [2019-11-06 21:23:41,168 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:23:41,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat