/usr/bin/java -Xmx16000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -s ../../../trunk/examples/settings/automizer/concurrent/svcomp-Reach-32bit-Automizer_Default-noMmResRef-FA-NoLbe.epf -tc ../../../trunk/examples/toolchains/AutomizerBplInline.xml -i ../../../trunk/examples/concurrent/bpl/weaver-benchmarks/generated/test/easy5.wvr.bpl -------------------------------------------------------------------------------- This is Ultimate 0.2.1-a865e3bea3ade1065a4c95009cfa501fe03c5538-a865e3b [2021-02-19 20:42:32,730 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-02-19 20:42:32,733 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-02-19 20:42:32,775 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-02-19 20:42:32,776 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-02-19 20:42:32,779 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-02-19 20:42:32,782 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-02-19 20:42:32,789 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-02-19 20:42:32,791 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-02-19 20:42:32,796 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-02-19 20:42:32,796 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-02-19 20:42:32,798 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-02-19 20:42:32,798 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-02-19 20:42:32,801 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-02-19 20:42:32,803 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-02-19 20:42:32,805 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-02-19 20:42:32,808 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-02-19 20:42:32,810 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-02-19 20:42:32,814 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-02-19 20:42:32,825 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-02-19 20:42:32,827 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-02-19 20:42:32,829 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-02-19 20:42:32,830 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-02-19 20:42:32,833 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-02-19 20:42:32,839 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-02-19 20:42:32,839 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-02-19 20:42:32,839 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-02-19 20:42:32,840 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-02-19 20:42:32,841 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-02-19 20:42:32,841 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-02-19 20:42:32,842 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-02-19 20:42:32,842 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-02-19 20:42:32,844 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-02-19 20:42:32,845 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-02-19 20:42:32,846 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-02-19 20:42:32,846 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-02-19 20:42:32,847 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-02-19 20:42:32,847 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-02-19 20:42:32,847 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-02-19 20:42:32,848 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-02-19 20:42:32,849 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-02-19 20:42:32,850 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/concurrent/svcomp-Reach-32bit-Automizer_Default-noMmResRef-FA-NoLbe.epf [2021-02-19 20:42:32,895 INFO L113 SettingsManager]: Loading preferences was successful [2021-02-19 20:42:32,896 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-02-19 20:42:32,897 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-02-19 20:42:32,897 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-02-19 20:42:32,901 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-02-19 20:42:32,901 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-02-19 20:42:32,901 INFO L138 SettingsManager]: * Use SBE=true [2021-02-19 20:42:32,901 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-02-19 20:42:32,902 INFO L138 SettingsManager]: * sizeof long=4 [2021-02-19 20:42:32,902 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-02-19 20:42:32,902 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-02-19 20:42:32,902 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-02-19 20:42:32,902 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-02-19 20:42:32,903 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-02-19 20:42:32,903 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-02-19 20:42:32,903 INFO L138 SettingsManager]: * sizeof long double=12 [2021-02-19 20:42:32,903 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-02-19 20:42:32,903 INFO L138 SettingsManager]: * Use constant arrays=true [2021-02-19 20:42:32,903 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-02-19 20:42:32,904 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-02-19 20:42:32,904 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-02-19 20:42:32,904 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-02-19 20:42:32,904 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-02-19 20:42:32,904 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-02-19 20:42:32,904 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-02-19 20:42:32,904 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-02-19 20:42:32,905 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-02-19 20:42:32,905 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-02-19 20:42:32,905 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-02-19 20:42:32,905 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-02-19 20:42:32,905 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-02-19 20:42:32,905 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-02-19 20:42:33,351 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-02-19 20:42:33,374 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-02-19 20:42:33,377 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-02-19 20:42:33,378 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2021-02-19 20:42:33,380 INFO L275 PluginConnector]: Boogie PL CUP Parser initialized [2021-02-19 20:42:33,381 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/weaver-benchmarks/generated/test/easy5.wvr.bpl [2021-02-19 20:42:33,382 INFO L110 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/weaver-benchmarks/generated/test/easy5.wvr.bpl' [2021-02-19 20:42:33,670 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-02-19 20:42:33,676 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-02-19 20:42:33,678 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-02-19 20:42:33,678 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-02-19 20:42:33,678 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-02-19 20:42:33,690 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "easy5.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 19.02 08:42:33" (1/1) ... [2021-02-19 20:42:33,697 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "easy5.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 19.02 08:42:33" (1/1) ... [2021-02-19 20:42:33,706 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-02-19 20:42:33,708 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-02-19 20:42:33,708 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-02-19 20:42:33,708 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-02-19 20:42:33,715 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "easy5.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 19.02 08:42:33" (1/1) ... [2021-02-19 20:42:33,716 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "easy5.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 19.02 08:42:33" (1/1) ... [2021-02-19 20:42:33,717 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "easy5.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 19.02 08:42:33" (1/1) ... [2021-02-19 20:42:33,717 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "easy5.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 19.02 08:42:33" (1/1) ... [2021-02-19 20:42:33,720 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "easy5.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 19.02 08:42:33" (1/1) ... [2021-02-19 20:42:33,725 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "easy5.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 19.02 08:42:33" (1/1) ... [2021-02-19 20:42:33,726 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "easy5.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 19.02 08:42:33" (1/1) ... [2021-02-19 20:42:33,727 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-02-19 20:42:33,728 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-02-19 20:42:33,728 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-02-19 20:42:33,728 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-02-19 20:42:33,730 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "easy5.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 19.02 08:42:33" (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 [2021-02-19 20:42:33,818 INFO L124 BoogieDeclarations]: Specification and implementation of procedure ULTIMATE.start given in one single declaration [2021-02-19 20:42:33,819 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-02-19 20:42:33,819 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-02-19 20:42:34,069 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-02-19 20:42:34,069 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-02-19 20:42:34,071 INFO L202 PluginConnector]: Adding new model easy5.wvr.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.02 08:42:34 BoogieIcfgContainer [2021-02-19 20:42:34,071 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-02-19 20:42:34,073 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-02-19 20:42:34,073 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-02-19 20:42:34,076 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-02-19 20:42:34,076 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "easy5.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 19.02 08:42:33" (1/2) ... [2021-02-19 20:42:34,077 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@269d3693 and model type easy5.wvr.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.02 08:42:34, skipping insertion in model container [2021-02-19 20:42:34,077 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "easy5.wvr.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.02 08:42:34" (2/2) ... [2021-02-19 20:42:34,082 INFO L111 eAbstractionObserver]: Analyzing ICFG easy5.wvr.bpl [2021-02-19 20:42:34,091 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-02-19 20:42:34,102 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-02-19 20:42:34,121 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-02-19 20:42:34,160 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-02-19 20:42:34,161 INFO L377 AbstractCegarLoop]: Hoare is true [2021-02-19 20:42:34,162 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-02-19 20:42:34,162 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-02-19 20:42:34,162 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-02-19 20:42:34,162 INFO L381 AbstractCegarLoop]: Difference is false [2021-02-19 20:42:34,163 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-02-19 20:42:34,163 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-02-19 20:42:34,193 INFO L276 IsEmpty]: Start isEmpty. Operand has 11 states, 9 states have (on average 1.7777777777777777) internal successors, (16), 10 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:42:34,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2021-02-19 20:42:34,200 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 20:42:34,200 INFO L506 BasicCegarLoop]: trace histogram [1, 1, 1] [2021-02-19 20:42:34,201 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 20:42:34,209 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 20:42:34,210 INFO L82 PathProgramCache]: Analyzing trace with hash 30944, now seen corresponding path program 1 times [2021-02-19 20:42:34,219 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 20:42:34,220 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1166426516] [2021-02-19 20:42:34,220 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 20:42:34,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 20:42:34,366 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 20:42:34,368 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1166426516] [2021-02-19 20:42:34,368 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-02-19 20:42:34,369 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-02-19 20:42:34,370 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1056640128] [2021-02-19 20:42:34,374 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-02-19 20:42:34,375 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 20:42:34,389 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-02-19 20:42:34,391 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-02-19 20:42:34,393 INFO L87 Difference]: Start difference. First operand has 11 states, 9 states have (on average 1.7777777777777777) internal successors, (16), 10 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 1.0) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:42:34,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 20:42:34,440 INFO L93 Difference]: Finished difference Result 19 states and 30 transitions. [2021-02-19 20:42:34,454 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-02-19 20:42:34,456 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 1.0) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 3 [2021-02-19 20:42:34,457 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 20:42:34,464 INFO L225 Difference]: With dead ends: 19 [2021-02-19 20:42:34,465 INFO L226 Difference]: Without dead ends: 15 [2021-02-19 20:42:34,467 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-02-19 20:42:34,500 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-02-19 20:42:34,530 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2021-02-19 20:42:34,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:42:34,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 25 transitions. [2021-02-19 20:42:34,547 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 25 transitions. Word has length 3 [2021-02-19 20:42:34,547 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 20:42:34,547 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 25 transitions. [2021-02-19 20:42:34,547 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 1.0) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:42:34,547 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 25 transitions. [2021-02-19 20:42:34,548 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-02-19 20:42:34,548 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 20:42:34,548 INFO L506 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 20:42:34,548 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-02-19 20:42:34,549 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 20:42:34,549 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 20:42:34,549 INFO L82 PathProgramCache]: Analyzing trace with hash -2104739408, now seen corresponding path program 1 times [2021-02-19 20:42:34,550 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 20:42:34,550 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [67660237] [2021-02-19 20:42:34,550 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 20:42:34,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 20:42:34,600 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 20:42:34,600 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [67660237] [2021-02-19 20:42:34,601 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-02-19 20:42:34,601 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-02-19 20:42:34,601 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1974468140] [2021-02-19 20:42:34,602 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-02-19 20:42:34,603 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 20:42:34,604 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-02-19 20:42:34,604 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-02-19 20:42:34,604 INFO L87 Difference]: Start difference. First operand 15 states and 25 transitions. Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:42:34,669 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 20:42:34,670 INFO L93 Difference]: Finished difference Result 37 states and 61 transitions. [2021-02-19 20:42:34,671 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-02-19 20:42:34,671 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-02-19 20:42:34,672 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 20:42:34,674 INFO L225 Difference]: With dead ends: 37 [2021-02-19 20:42:34,674 INFO L226 Difference]: Without dead ends: 20 [2021-02-19 20:42:34,675 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-02-19 20:42:34,676 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-02-19 20:42:34,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 18. [2021-02-19 20:42:34,684 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 17 states have (on average 1.4705882352941178) internal successors, (25), 17 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:42:34,686 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 25 transitions. [2021-02-19 20:42:34,686 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 25 transitions. Word has length 8 [2021-02-19 20:42:34,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 20:42:34,687 INFO L480 AbstractCegarLoop]: Abstraction has 18 states and 25 transitions. [2021-02-19 20:42:34,687 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:42:34,687 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 25 transitions. [2021-02-19 20:42:34,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-02-19 20:42:34,688 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 20:42:34,688 INFO L506 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 20:42:34,688 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-02-19 20:42:34,688 INFO L428 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 20:42:34,689 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 20:42:34,689 INFO L82 PathProgramCache]: Analyzing trace with hash -2104679826, now seen corresponding path program 1 times [2021-02-19 20:42:34,689 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 20:42:34,689 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [683590185] [2021-02-19 20:42:34,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 20:42:34,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 20:42:34,759 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 20:42:34,759 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [683590185] [2021-02-19 20:42:34,762 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1464156536] [2021-02-19 20:42:34,762 INFO L95 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 [2021-02-19 20:42:34,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 20:42:34,823 INFO L263 TraceCheckSpWp]: Trace formula consists of 26 conjuncts, 3 conjunts are in the unsatisfiable core [2021-02-19 20:42:34,829 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 20:42:34,933 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 20:42:34,933 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 20:42:34,934 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3] total 3 [2021-02-19 20:42:34,934 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [353733770] [2021-02-19 20:42:34,935 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-02-19 20:42:34,935 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 20:42:34,938 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-02-19 20:42:34,938 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-02-19 20:42:34,939 INFO L87 Difference]: Start difference. First operand 18 states and 25 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:42:34,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 20:42:34,966 INFO L93 Difference]: Finished difference Result 29 states and 41 transitions. [2021-02-19 20:42:34,966 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-02-19 20:42:34,967 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-02-19 20:42:34,967 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 20:42:34,968 INFO L225 Difference]: With dead ends: 29 [2021-02-19 20:42:34,968 INFO L226 Difference]: Without dead ends: 24 [2021-02-19 20:42:34,972 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-02-19 20:42:34,973 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-02-19 20:42:34,978 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2021-02-19 20:42:34,979 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 23 states have (on average 1.434782608695652) internal successors, (33), 23 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:42:34,980 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 33 transitions. [2021-02-19 20:42:34,981 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 33 transitions. Word has length 8 [2021-02-19 20:42:34,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 20:42:34,981 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 33 transitions. [2021-02-19 20:42:34,981 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:42:34,982 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 33 transitions. [2021-02-19 20:42:34,983 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-02-19 20:42:34,986 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 20:42:34,987 INFO L506 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1] [2021-02-19 20:42:35,190 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-02-19 20:42:35,190 INFO L428 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 20:42:35,191 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 20:42:35,191 INFO L82 PathProgramCache]: Analyzing trace with hash 215105952, now seen corresponding path program 2 times [2021-02-19 20:42:35,191 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 20:42:35,191 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1641199015] [2021-02-19 20:42:35,191 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 20:42:35,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 20:42:35,253 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 20:42:35,254 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1641199015] [2021-02-19 20:42:35,255 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [756746049] [2021-02-19 20:42:35,255 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 20:42:35,284 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-02-19 20:42:35,284 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 20:42:35,285 INFO L263 TraceCheckSpWp]: Trace formula consists of 38 conjuncts, 4 conjunts are in the unsatisfiable core [2021-02-19 20:42:35,286 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 20:42:35,328 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 20:42:35,328 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 20:42:35,328 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 4 [2021-02-19 20:42:35,328 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1291149357] [2021-02-19 20:42:35,329 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-02-19 20:42:35,329 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 20:42:35,329 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-02-19 20:42:35,330 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-02-19 20:42:35,330 INFO L87 Difference]: Start difference. First operand 24 states and 33 transitions. Second operand has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:42:35,342 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 20:42:35,342 INFO L93 Difference]: Finished difference Result 35 states and 49 transitions. [2021-02-19 20:42:35,343 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-02-19 20:42:35,343 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2021-02-19 20:42:35,343 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 20:42:35,344 INFO L225 Difference]: With dead ends: 35 [2021-02-19 20:42:35,344 INFO L226 Difference]: Without dead ends: 30 [2021-02-19 20:42:35,344 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-02-19 20:42:35,345 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-02-19 20:42:35,347 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2021-02-19 20:42:35,348 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 29 states have (on average 1.4137931034482758) internal successors, (41), 29 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:42:35,349 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 41 transitions. [2021-02-19 20:42:35,349 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 41 transitions. Word has length 13 [2021-02-19 20:42:35,349 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 20:42:35,349 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 41 transitions. [2021-02-19 20:42:35,349 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:42:35,349 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 41 transitions. [2021-02-19 20:42:35,350 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-02-19 20:42:35,350 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 20:42:35,350 INFO L506 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 1, 1, 1] [2021-02-19 20:42:35,574 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 20:42:35,574 INFO L428 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 20:42:35,575 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 20:42:35,575 INFO L82 PathProgramCache]: Analyzing trace with hash 1631244718, now seen corresponding path program 3 times [2021-02-19 20:42:35,585 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 20:42:35,585 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [410673903] [2021-02-19 20:42:35,586 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 20:42:35,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 20:42:35,662 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 20:42:35,663 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [410673903] [2021-02-19 20:42:35,663 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [479905613] [2021-02-19 20:42:35,663 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 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 [2021-02-19 20:42:35,692 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-02-19 20:42:35,693 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 20:42:35,694 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 5 conjunts are in the unsatisfiable core [2021-02-19 20:42:35,695 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 20:42:35,770 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 20:42:35,771 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 20:42:35,771 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 5 [2021-02-19 20:42:35,771 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [828507970] [2021-02-19 20:42:35,772 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-02-19 20:42:35,772 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 20:42:35,772 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-02-19 20:42:35,773 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-02-19 20:42:35,773 INFO L87 Difference]: Start difference. First operand 30 states and 41 transitions. Second operand has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:42:35,809 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 20:42:35,809 INFO L93 Difference]: Finished difference Result 41 states and 57 transitions. [2021-02-19 20:42:35,812 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-02-19 20:42:35,813 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2021-02-19 20:42:35,813 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 20:42:35,813 INFO L225 Difference]: With dead ends: 41 [2021-02-19 20:42:35,814 INFO L226 Difference]: Without dead ends: 36 [2021-02-19 20:42:35,814 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-02-19 20:42:35,814 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-02-19 20:42:35,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2021-02-19 20:42:35,818 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 35 states have (on average 1.4) internal successors, (49), 35 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:42:35,819 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 49 transitions. [2021-02-19 20:42:35,819 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 49 transitions. Word has length 18 [2021-02-19 20:42:35,819 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 20:42:35,819 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 49 transitions. [2021-02-19 20:42:35,819 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:42:35,820 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 49 transitions. [2021-02-19 20:42:35,820 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-02-19 20:42:35,820 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 20:42:35,820 INFO L506 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 1, 1, 1] [2021-02-19 20:42:36,046 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 20:42:36,046 INFO L428 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 20:42:36,047 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 20:42:36,047 INFO L82 PathProgramCache]: Analyzing trace with hash 1603279456, now seen corresponding path program 4 times [2021-02-19 20:42:36,047 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 20:42:36,047 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1642545230] [2021-02-19 20:42:36,047 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 20:42:36,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 20:42:36,105 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 34 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 20:42:36,106 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1642545230] [2021-02-19 20:42:36,106 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1165803117] [2021-02-19 20:42:36,106 INFO L93 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 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 [2021-02-19 20:42:36,157 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-02-19 20:42:36,158 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 20:42:36,159 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 6 conjunts are in the unsatisfiable core [2021-02-19 20:42:36,160 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 20:42:36,235 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 34 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 20:42:36,235 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 20:42:36,235 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2021-02-19 20:42:36,236 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1330687449] [2021-02-19 20:42:36,236 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-02-19 20:42:36,236 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 20:42:36,237 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-02-19 20:42:36,237 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2021-02-19 20:42:36,237 INFO L87 Difference]: Start difference. First operand 36 states and 49 transitions. Second operand has 7 states, 7 states have (on average 3.2857142857142856) internal successors, (23), 6 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:42:36,259 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 20:42:36,260 INFO L93 Difference]: Finished difference Result 47 states and 65 transitions. [2021-02-19 20:42:36,260 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-02-19 20:42:36,261 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.2857142857142856) internal successors, (23), 6 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2021-02-19 20:42:36,261 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 20:42:36,261 INFO L225 Difference]: With dead ends: 47 [2021-02-19 20:42:36,262 INFO L226 Difference]: Without dead ends: 42 [2021-02-19 20:42:36,262 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2021-02-19 20:42:36,262 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-02-19 20:42:36,266 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2021-02-19 20:42:36,267 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 41 states have (on average 1.3902439024390243) internal successors, (57), 41 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:42:36,268 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 57 transitions. [2021-02-19 20:42:36,268 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 57 transitions. Word has length 23 [2021-02-19 20:42:36,268 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 20:42:36,268 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 57 transitions. [2021-02-19 20:42:36,268 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 3.2857142857142856) internal successors, (23), 6 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:42:36,269 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 57 transitions. [2021-02-19 20:42:36,269 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-02-19 20:42:36,269 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 20:42:36,270 INFO L506 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 1, 1, 1] [2021-02-19 20:42:36,478 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 20:42:36,478 INFO L428 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 20:42:36,479 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 20:42:36,479 INFO L82 PathProgramCache]: Analyzing trace with hash 453406958, now seen corresponding path program 5 times [2021-02-19 20:42:36,479 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 20:42:36,479 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1047012771] [2021-02-19 20:42:36,479 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 20:42:36,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 20:42:36,567 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 20:42:36,568 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1047012771] [2021-02-19 20:42:36,568 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1490578324] [2021-02-19 20:42:36,568 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 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 [2021-02-19 20:42:36,627 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-02-19 20:42:36,627 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 20:42:36,632 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 7 conjunts are in the unsatisfiable core [2021-02-19 20:42:36,633 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 20:42:36,810 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 20:42:36,811 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 20:42:36,811 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 7 [2021-02-19 20:42:36,811 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1253409184] [2021-02-19 20:42:36,811 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-02-19 20:42:36,812 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 20:42:36,812 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-02-19 20:42:36,812 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2021-02-19 20:42:36,813 INFO L87 Difference]: Start difference. First operand 42 states and 57 transitions. Second operand has 8 states, 8 states have (on average 3.5) internal successors, (28), 7 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:42:36,843 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 20:42:36,843 INFO L93 Difference]: Finished difference Result 53 states and 73 transitions. [2021-02-19 20:42:36,843 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-02-19 20:42:36,844 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.5) internal successors, (28), 7 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2021-02-19 20:42:36,844 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 20:42:36,845 INFO L225 Difference]: With dead ends: 53 [2021-02-19 20:42:36,845 INFO L226 Difference]: Without dead ends: 48 [2021-02-19 20:42:36,846 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2021-02-19 20:42:36,846 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-02-19 20:42:36,850 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2021-02-19 20:42:36,851 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 47 states have (on average 1.3829787234042554) internal successors, (65), 47 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:42:36,851 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 65 transitions. [2021-02-19 20:42:36,852 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 65 transitions. Word has length 28 [2021-02-19 20:42:36,852 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 20:42:36,852 INFO L480 AbstractCegarLoop]: Abstraction has 48 states and 65 transitions. [2021-02-19 20:42:36,852 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 3.5) internal successors, (28), 7 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:42:36,852 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 65 transitions. [2021-02-19 20:42:36,853 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-02-19 20:42:36,853 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 20:42:36,853 INFO L506 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 1, 1, 1] [2021-02-19 20:42:37,070 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-02-19 20:42:37,070 INFO L428 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 20:42:37,071 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 20:42:37,071 INFO L82 PathProgramCache]: Analyzing trace with hash -865729760, now seen corresponding path program 6 times [2021-02-19 20:42:37,071 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 20:42:37,072 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [525187652] [2021-02-19 20:42:37,072 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 20:42:37,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 20:42:37,145 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 20:42:37,145 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [525187652] [2021-02-19 20:42:37,145 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [476769202] [2021-02-19 20:42:37,146 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE 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 [2021-02-19 20:42:37,209 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-02-19 20:42:37,209 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 20:42:37,211 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 8 conjunts are in the unsatisfiable core [2021-02-19 20:42:37,212 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 20:42:37,341 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 20:42:37,341 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 20:42:37,341 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2021-02-19 20:42:37,342 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [195865979] [2021-02-19 20:42:37,342 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-02-19 20:42:37,342 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 20:42:37,343 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-02-19 20:42:37,343 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2021-02-19 20:42:37,343 INFO L87 Difference]: Start difference. First operand 48 states and 65 transitions. Second operand has 9 states, 9 states have (on average 3.6666666666666665) internal successors, (33), 8 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:42:37,361 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 20:42:37,361 INFO L93 Difference]: Finished difference Result 59 states and 81 transitions. [2021-02-19 20:42:37,362 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-02-19 20:42:37,362 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.6666666666666665) internal successors, (33), 8 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 33 [2021-02-19 20:42:37,362 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 20:42:37,363 INFO L225 Difference]: With dead ends: 59 [2021-02-19 20:42:37,363 INFO L226 Difference]: Without dead ends: 54 [2021-02-19 20:42:37,363 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2021-02-19 20:42:37,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-02-19 20:42:37,367 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2021-02-19 20:42:37,368 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 53 states have (on average 1.3773584905660377) internal successors, (73), 53 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:42:37,369 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 73 transitions. [2021-02-19 20:42:37,369 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 73 transitions. Word has length 33 [2021-02-19 20:42:37,370 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 20:42:37,370 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 73 transitions. [2021-02-19 20:42:37,370 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 3.6666666666666665) internal successors, (33), 8 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:42:37,370 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 73 transitions. [2021-02-19 20:42:37,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-02-19 20:42:37,371 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 20:42:37,371 INFO L506 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 1, 1, 1] [2021-02-19 20:42:37,598 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 20:42:37,599 INFO L428 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 20:42:37,599 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 20:42:37,599 INFO L82 PathProgramCache]: Analyzing trace with hash -1757151186, now seen corresponding path program 7 times [2021-02-19 20:42:37,599 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 20:42:37,600 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [944060036] [2021-02-19 20:42:37,600 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 20:42:37,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 20:42:37,729 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 0 proven. 112 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 20:42:37,730 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [944060036] [2021-02-19 20:42:37,730 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1182625075] [2021-02-19 20:42:37,730 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 20:42:37,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 20:42:37,785 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 9 conjunts are in the unsatisfiable core [2021-02-19 20:42:37,786 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 20:42:37,986 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 0 proven. 112 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 20:42:37,986 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 20:42:37,986 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 9 [2021-02-19 20:42:37,987 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [754532962] [2021-02-19 20:42:37,987 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-02-19 20:42:37,987 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 20:42:37,988 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-02-19 20:42:37,988 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2021-02-19 20:42:37,989 INFO L87 Difference]: Start difference. First operand 54 states and 73 transitions. Second operand has 10 states, 10 states have (on average 3.8) internal successors, (38), 9 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:42:38,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 20:42:38,010 INFO L93 Difference]: Finished difference Result 65 states and 89 transitions. [2021-02-19 20:42:38,010 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-02-19 20:42:38,011 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.8) internal successors, (38), 9 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 38 [2021-02-19 20:42:38,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 20:42:38,012 INFO L225 Difference]: With dead ends: 65 [2021-02-19 20:42:38,012 INFO L226 Difference]: Without dead ends: 60 [2021-02-19 20:42:38,012 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2021-02-19 20:42:38,013 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-02-19 20:42:38,017 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2021-02-19 20:42:38,018 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 59 states have (on average 1.3728813559322033) internal successors, (81), 59 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:42:38,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 81 transitions. [2021-02-19 20:42:38,019 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 81 transitions. Word has length 38 [2021-02-19 20:42:38,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 20:42:38,019 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 81 transitions. [2021-02-19 20:42:38,020 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.8) internal successors, (38), 9 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:42:38,020 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 81 transitions. [2021-02-19 20:42:38,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-02-19 20:42:38,021 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 20:42:38,021 INFO L506 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 1, 1, 1] [2021-02-19 20:42:38,250 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 20:42:38,250 INFO L428 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 20:42:38,251 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 20:42:38,251 INFO L82 PathProgramCache]: Analyzing trace with hash -528483360, now seen corresponding path program 8 times [2021-02-19 20:42:38,251 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 20:42:38,252 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1009639483] [2021-02-19 20:42:38,252 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 20:42:38,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 20:42:38,380 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 0 proven. 148 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 20:42:38,380 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1009639483] [2021-02-19 20:42:38,381 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1818394744] [2021-02-19 20:42:38,381 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 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 [2021-02-19 20:42:38,425 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-02-19 20:42:38,425 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 20:42:38,426 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 10 conjunts are in the unsatisfiable core [2021-02-19 20:42:38,428 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 20:42:38,635 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 0 proven. 148 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 20:42:38,636 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 20:42:38,636 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 10 [2021-02-19 20:42:38,639 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [404201712] [2021-02-19 20:42:38,641 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-02-19 20:42:38,641 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 20:42:38,642 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-02-19 20:42:38,642 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2021-02-19 20:42:38,644 INFO L87 Difference]: Start difference. First operand 60 states and 81 transitions. Second operand has 11 states, 11 states have (on average 3.909090909090909) internal successors, (43), 10 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:42:38,691 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 20:42:38,692 INFO L93 Difference]: Finished difference Result 71 states and 97 transitions. [2021-02-19 20:42:38,692 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-02-19 20:42:38,693 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 3.909090909090909) internal successors, (43), 10 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 43 [2021-02-19 20:42:38,693 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 20:42:38,698 INFO L225 Difference]: With dead ends: 71 [2021-02-19 20:42:38,698 INFO L226 Difference]: Without dead ends: 66 [2021-02-19 20:42:38,700 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2021-02-19 20:42:38,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2021-02-19 20:42:38,710 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 66. [2021-02-19 20:42:38,710 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 65 states have (on average 1.3692307692307693) internal successors, (89), 65 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:42:38,711 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 89 transitions. [2021-02-19 20:42:38,711 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 89 transitions. Word has length 43 [2021-02-19 20:42:38,711 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 20:42:38,711 INFO L480 AbstractCegarLoop]: Abstraction has 66 states and 89 transitions. [2021-02-19 20:42:38,712 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 3.909090909090909) internal successors, (43), 10 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:42:38,712 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 89 transitions. [2021-02-19 20:42:38,713 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-02-19 20:42:38,713 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 20:42:38,713 INFO L506 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 1, 1, 1] [2021-02-19 20:42:38,913 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-02-19 20:42:38,914 INFO L428 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 20:42:38,914 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 20:42:38,915 INFO L82 PathProgramCache]: Analyzing trace with hash -1538818194, now seen corresponding path program 9 times [2021-02-19 20:42:38,915 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 20:42:38,915 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [26055157] [2021-02-19 20:42:38,915 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 20:42:38,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 20:42:39,039 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 0 proven. 189 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 20:42:39,040 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [26055157] [2021-02-19 20:42:39,040 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1439684570] [2021-02-19 20:42:39,040 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 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 [2021-02-19 20:42:39,087 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-02-19 20:42:39,088 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 20:42:39,089 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 11 conjunts are in the unsatisfiable core [2021-02-19 20:42:39,100 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 20:42:39,236 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 0 proven. 189 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 20:42:39,237 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 20:42:39,237 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2021-02-19 20:42:39,238 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [505429448] [2021-02-19 20:42:39,239 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-02-19 20:42:39,239 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 20:42:39,239 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-02-19 20:42:39,240 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2021-02-19 20:42:39,240 INFO L87 Difference]: Start difference. First operand 66 states and 89 transitions. Second operand has 12 states, 12 states have (on average 4.0) internal successors, (48), 11 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:42:39,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 20:42:39,281 INFO L93 Difference]: Finished difference Result 77 states and 105 transitions. [2021-02-19 20:42:39,281 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-02-19 20:42:39,281 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 4.0) internal successors, (48), 11 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 48 [2021-02-19 20:42:39,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 20:42:39,284 INFO L225 Difference]: With dead ends: 77 [2021-02-19 20:42:39,284 INFO L226 Difference]: Without dead ends: 72 [2021-02-19 20:42:39,284 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2021-02-19 20:42:39,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2021-02-19 20:42:39,294 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 72. [2021-02-19 20:42:39,296 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 71 states have (on average 1.3661971830985915) internal successors, (97), 71 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:42:39,299 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 97 transitions. [2021-02-19 20:42:39,300 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 97 transitions. Word has length 48 [2021-02-19 20:42:39,301 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 20:42:39,301 INFO L480 AbstractCegarLoop]: Abstraction has 72 states and 97 transitions. [2021-02-19 20:42:39,302 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 4.0) internal successors, (48), 11 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:42:39,302 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 97 transitions. [2021-02-19 20:42:39,308 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-02-19 20:42:39,309 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 20:42:39,309 INFO L506 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 1, 1, 1] [2021-02-19 20:42:39,534 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 20:42:39,534 INFO L428 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 20:42:39,535 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 20:42:39,535 INFO L82 PathProgramCache]: Analyzing trace with hash -1576401760, now seen corresponding path program 10 times [2021-02-19 20:42:39,535 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 20:42:39,535 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [961530762] [2021-02-19 20:42:39,535 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 20:42:39,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 20:42:39,632 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 121 proven. 27 refuted. 0 times theorem prover too weak. 87 trivial. 0 not checked. [2021-02-19 20:42:39,633 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [961530762] [2021-02-19 20:42:39,633 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [456214780] [2021-02-19 20:42:39,633 INFO L93 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 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 [2021-02-19 20:42:39,684 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-02-19 20:42:39,685 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 20:42:39,685 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 11 conjunts are in the unsatisfiable core [2021-02-19 20:42:39,698 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 20:42:39,843 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 121 proven. 27 refuted. 0 times theorem prover too weak. 87 trivial. 0 not checked. [2021-02-19 20:42:39,843 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 20:42:39,844 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2021-02-19 20:42:39,844 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [555780244] [2021-02-19 20:42:39,844 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-02-19 20:42:39,844 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 20:42:39,847 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-02-19 20:42:39,847 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-02-19 20:42:39,847 INFO L87 Difference]: Start difference. First operand 72 states and 97 transitions. Second operand has 7 states, 7 states have (on average 3.857142857142857) internal successors, (27), 6 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:42:39,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 20:42:39,908 INFO L93 Difference]: Finished difference Result 259 states and 359 transitions. [2021-02-19 20:42:39,909 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-02-19 20:42:39,909 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.857142857142857) internal successors, (27), 6 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 53 [2021-02-19 20:42:39,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 20:42:39,915 INFO L225 Difference]: With dead ends: 259 [2021-02-19 20:42:39,915 INFO L226 Difference]: Without dead ends: 204 [2021-02-19 20:42:39,916 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 52 SyntacticMatches, 2 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-02-19 20:42:39,917 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 204 states. [2021-02-19 20:42:39,925 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 204 to 192. [2021-02-19 20:42:39,932 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 192 states, 191 states have (on average 1.4031413612565444) internal successors, (268), 191 states have internal predecessors, (268), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:42:39,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 268 transitions. [2021-02-19 20:42:39,938 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 268 transitions. Word has length 53 [2021-02-19 20:42:39,938 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 20:42:39,938 INFO L480 AbstractCegarLoop]: Abstraction has 192 states and 268 transitions. [2021-02-19 20:42:39,939 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 3.857142857142857) internal successors, (27), 6 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:42:39,939 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 268 transitions. [2021-02-19 20:42:39,939 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-02-19 20:42:39,940 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 20:42:39,940 INFO L506 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 7, 3, 3, 1, 1, 1] [2021-02-19 20:42:40,159 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 20:42:40,160 INFO L428 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 20:42:40,161 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 20:42:40,161 INFO L82 PathProgramCache]: Analyzing trace with hash 1862761816, now seen corresponding path program 1 times [2021-02-19 20:42:40,161 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 20:42:40,161 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [520329371] [2021-02-19 20:42:40,161 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 20:42:40,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 20:42:40,180 INFO L134 CoverageAnalysis]: Checked inductivity of 238 backedges. 63 proven. 0 refuted. 0 times theorem prover too weak. 175 trivial. 0 not checked. [2021-02-19 20:42:40,180 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [520329371] [2021-02-19 20:42:40,180 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-02-19 20:42:40,180 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-02-19 20:42:40,181 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [120412750] [2021-02-19 20:42:40,181 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-02-19 20:42:40,181 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 20:42:40,182 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-02-19 20:42:40,182 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-02-19 20:42:40,182 INFO L87 Difference]: Start difference. First operand 192 states and 268 transitions. Second operand has 3 states, 3 states have (on average 5.666666666666667) internal successors, (17), 3 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:42:40,192 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 20:42:40,193 INFO L93 Difference]: Finished difference Result 461 states and 647 transitions. [2021-02-19 20:42:40,193 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-02-19 20:42:40,193 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 5.666666666666667) internal successors, (17), 3 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 56 [2021-02-19 20:42:40,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 20:42:40,194 INFO L225 Difference]: With dead ends: 461 [2021-02-19 20:42:40,194 INFO L226 Difference]: Without dead ends: 144 [2021-02-19 20:42:40,196 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-02-19 20:42:40,196 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2021-02-19 20:42:40,202 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 129. [2021-02-19 20:42:40,203 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 129 states, 128 states have (on average 1.3046875) internal successors, (167), 128 states have internal predecessors, (167), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:42:40,204 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 167 transitions. [2021-02-19 20:42:40,204 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 167 transitions. Word has length 56 [2021-02-19 20:42:40,204 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 20:42:40,204 INFO L480 AbstractCegarLoop]: Abstraction has 129 states and 167 transitions. [2021-02-19 20:42:40,204 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 5.666666666666667) internal successors, (17), 3 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:42:40,205 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 167 transitions. [2021-02-19 20:42:40,205 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-02-19 20:42:40,205 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 20:42:40,205 INFO L506 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 8, 8, 2, 1, 1, 1] [2021-02-19 20:42:40,205 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-02-19 20:42:40,206 INFO L428 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 20:42:40,206 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 20:42:40,206 INFO L82 PathProgramCache]: Analyzing trace with hash -1564547056, now seen corresponding path program 2 times [2021-02-19 20:42:40,206 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 20:42:40,206 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2085035913] [2021-02-19 20:42:40,207 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 20:42:40,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 20:42:40,239 INFO L134 CoverageAnalysis]: Checked inductivity of 263 backedges. 91 proven. 0 refuted. 0 times theorem prover too weak. 172 trivial. 0 not checked. [2021-02-19 20:42:40,239 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2085035913] [2021-02-19 20:42:40,239 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-02-19 20:42:40,239 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-02-19 20:42:40,239 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [159405341] [2021-02-19 20:42:40,240 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-02-19 20:42:40,240 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 20:42:40,240 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-02-19 20:42:40,241 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-02-19 20:42:40,241 INFO L87 Difference]: Start difference. First operand 129 states and 167 transitions. Second operand has 3 states, 3 states have (on average 5.666666666666667) internal successors, (17), 3 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:42:40,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 20:42:40,246 INFO L93 Difference]: Finished difference Result 134 states and 171 transitions. [2021-02-19 20:42:40,246 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-02-19 20:42:40,246 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 5.666666666666667) internal successors, (17), 3 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 61 [2021-02-19 20:42:40,247 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 20:42:40,247 INFO L225 Difference]: With dead ends: 134 [2021-02-19 20:42:40,247 INFO L226 Difference]: Without dead ends: 81 [2021-02-19 20:42:40,248 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-02-19 20:42:40,248 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2021-02-19 20:42:40,252 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 71. [2021-02-19 20:42:40,253 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 70 states have (on average 1.2) internal successors, (84), 70 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:42:40,253 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 84 transitions. [2021-02-19 20:42:40,253 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 84 transitions. Word has length 61 [2021-02-19 20:42:40,254 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 20:42:40,254 INFO L480 AbstractCegarLoop]: Abstraction has 71 states and 84 transitions. [2021-02-19 20:42:40,254 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 5.666666666666667) internal successors, (17), 3 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:42:40,254 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 84 transitions. [2021-02-19 20:42:40,254 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-02-19 20:42:40,254 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 20:42:40,255 INFO L506 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 10, 1, 1, 1] [2021-02-19 20:42:40,255 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-02-19 20:42:40,255 INFO L428 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 20:42:40,255 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 20:42:40,255 INFO L82 PathProgramCache]: Analyzing trace with hash 1795706604, now seen corresponding path program 1 times [2021-02-19 20:42:40,255 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 20:42:40,256 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [192699244] [2021-02-19 20:42:40,256 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 20:42:40,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 20:42:40,348 INFO L134 CoverageAnalysis]: Checked inductivity of 280 backedges. 152 proven. 48 refuted. 0 times theorem prover too weak. 80 trivial. 0 not checked. [2021-02-19 20:42:40,348 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [192699244] [2021-02-19 20:42:40,348 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [706478038] [2021-02-19 20:42:40,348 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 20:42:40,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 20:42:40,398 INFO L263 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 13 conjunts are in the unsatisfiable core [2021-02-19 20:42:40,405 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 20:42:40,526 INFO L134 CoverageAnalysis]: Checked inductivity of 280 backedges. 152 proven. 48 refuted. 0 times theorem prover too weak. 80 trivial. 0 not checked. [2021-02-19 20:42:40,526 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 20:42:40,527 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 7 [2021-02-19 20:42:40,527 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [290712375] [2021-02-19 20:42:40,528 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-02-19 20:42:40,528 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 20:42:40,528 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-02-19 20:42:40,529 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-02-19 20:42:40,529 INFO L87 Difference]: Start difference. First operand 71 states and 84 transitions. Second operand has 8 states, 8 states have (on average 4.5) internal successors, (36), 7 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:42:40,574 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 20:42:40,575 INFO L93 Difference]: Finished difference Result 146 states and 169 transitions. [2021-02-19 20:42:40,575 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-02-19 20:42:40,576 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.5) internal successors, (36), 7 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 63 [2021-02-19 20:42:40,576 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 20:42:40,576 INFO L225 Difference]: With dead ends: 146 [2021-02-19 20:42:40,576 INFO L226 Difference]: Without dead ends: 0 [2021-02-19 20:42:40,577 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 62 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-02-19 20:42:40,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-02-19 20:42:40,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-02-19 20:42:40,577 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:42:40,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-02-19 20:42:40,577 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 63 [2021-02-19 20:42:40,578 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 20:42:40,578 INFO L480 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-02-19 20:42:40,578 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 4.5) internal successors, (36), 7 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:42:40,578 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-02-19 20:42:40,578 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-02-19 20:42:40,790 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-02-19 20:42:40,792 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2021-02-19 20:42:41,332 WARN L202 SmtUtils]: Spent 453.00 ms on a formula simplification. DAG size of input: 110 DAG size of output: 65 [2021-02-19 20:42:41,337 INFO L198 CegarLoopUtils]: For program point ULTIMATE.startEXIT(lines 16 52) no Hoare annotation was computed. [2021-02-19 20:42:41,338 INFO L198 CegarLoopUtils]: For program point L27(lines 27 35) no Hoare annotation was computed. [2021-02-19 20:42:41,338 INFO L198 CegarLoopUtils]: For program point L27-1(lines 27 48) no Hoare annotation was computed. [2021-02-19 20:42:41,338 INFO L198 CegarLoopUtils]: For program point L38(lines 38 41) no Hoare annotation was computed. [2021-02-19 20:42:41,338 INFO L198 CegarLoopUtils]: For program point L38-2(lines 38 46) no Hoare annotation was computed. [2021-02-19 20:42:41,340 INFO L194 CegarLoopUtils]: At program point L36(lines 24 49) the Hoare annotation is: (let ((.cse6 (<= d 9)) (.cse5 (not sec)) (.cse0 (<= 1 s)) (.cse1 (<= s 1)) (.cse3 (<= s 0)) (.cse4 (<= 0 s))) (or (and (<= t 2) (let ((.cse2 (<= d 2))) (or (and .cse0 .cse1 .cse2) (and .cse3 .cse4 .cse2))) (<= 2 t)) (and (<= 3 s) .cse5 .cse6 (<= s 3)) (and (<= t 0) .cse3 (<= d 0) (<= 0 t) .cse4) (and .cse0 .cse5 .cse1 (<= d 7)) (and v_break .cse6) (and .cse3 .cse5 .cse4 (<= d 6)) (and (<= t 3) (<= 3 t) (let ((.cse7 (<= d 3))) (or (and .cse7 .cse0 .cse1) (and .cse7 .cse3 .cse4)))) (and (<= 1 t) (let ((.cse8 (<= d 1))) (or (and .cse3 .cse8 .cse4) (and .cse0 .cse1 .cse8))) (<= t 1)) (and (<= s 2) (<= d 8) (<= 2 s) .cse5) (and (<= 4 t) (<= t 4) (let ((.cse9 (<= d 4))) (or (and .cse0 .cse9 .cse1) (and .cse3 .cse9 .cse4)))))) [2021-02-19 20:42:41,341 INFO L198 CegarLoopUtils]: For program point L30(lines 30 33) no Hoare annotation was computed. [2021-02-19 20:42:41,341 INFO L198 CegarLoopUtils]: For program point ULTIMATE.startENTRY(lines 16 52) no Hoare annotation was computed. [2021-02-19 20:42:41,341 INFO L198 CegarLoopUtils]: For program point ULTIMATE.startFINAL(lines 16 52) no Hoare annotation was computed. [2021-02-19 20:42:41,341 INFO L198 CegarLoopUtils]: For program point ULTIMATE.startErr0ASSERT_VIOLATIONASSERT(line 51) no Hoare annotation was computed. [2021-02-19 20:42:41,341 INFO L198 CegarLoopUtils]: For program point L51(line 51) no Hoare annotation was computed. [2021-02-19 20:42:41,372 INFO L202 PluginConnector]: Adding new model easy5.wvr.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 19.02 08:42:41 BoogieIcfgContainer [2021-02-19 20:42:41,373 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-02-19 20:42:41,373 INFO L168 Benchmark]: Toolchain (without parser) took 7701.84 ms. Allocated memory was 255.9 MB in the beginning and 375.4 MB in the end (delta: 119.5 MB). Free memory was 236.8 MB in the beginning and 284.9 MB in the end (delta: -48.1 MB). Peak memory consumption was 136.8 MB. Max. memory is 16.0 GB. [2021-02-19 20:42:41,373 INFO L168 Benchmark]: Boogie PL CUP Parser took 0.15 ms. Allocated memory is still 255.9 MB. Free memory is still 237.9 MB. There was no memory consumed. Max. memory is 16.0 GB. [2021-02-19 20:42:41,374 INFO L168 Benchmark]: Boogie Procedure Inliner took 28.91 ms. Allocated memory is still 255.9 MB. Free memory was 236.3 MB in the beginning and 234.8 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.0 GB. [2021-02-19 20:42:41,374 INFO L168 Benchmark]: Boogie Preprocessor took 18.98 ms. Allocated memory is still 255.9 MB. Free memory was 234.8 MB in the beginning and 233.9 MB in the end (delta: 954.1 kB). There was no memory consumed. Max. memory is 16.0 GB. [2021-02-19 20:42:41,374 INFO L168 Benchmark]: RCFGBuilder took 343.29 ms. Allocated memory is still 255.9 MB. Free memory was 233.9 MB in the beginning and 240.2 MB in the end (delta: -6.3 MB). Peak memory consumption was 20.7 MB. Max. memory is 16.0 GB. [2021-02-19 20:42:41,374 INFO L168 Benchmark]: TraceAbstraction took 7299.78 ms. Allocated memory was 255.9 MB in the beginning and 375.4 MB in the end (delta: 119.5 MB). Free memory was 239.8 MB in the beginning and 284.9 MB in the end (delta: -45.2 MB). Peak memory consumption was 139.2 MB. Max. memory is 16.0 GB. [2021-02-19 20:42:41,374 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * Boogie PL CUP Parser took 0.15 ms. Allocated memory is still 255.9 MB. Free memory is still 237.9 MB. There was no memory consumed. Max. memory is 16.0 GB. * Boogie Procedure Inliner took 28.91 ms. Allocated memory is still 255.9 MB. Free memory was 236.3 MB in the beginning and 234.8 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.0 GB. * Boogie Preprocessor took 18.98 ms. Allocated memory is still 255.9 MB. Free memory was 234.8 MB in the beginning and 233.9 MB in the end (delta: 954.1 kB). There was no memory consumed. Max. memory is 16.0 GB. * RCFGBuilder took 343.29 ms. Allocated memory is still 255.9 MB. Free memory was 233.9 MB in the beginning and 240.2 MB in the end (delta: -6.3 MB). Peak memory consumption was 20.7 MB. Max. memory is 16.0 GB. * TraceAbstraction took 7299.78 ms. Allocated memory was 255.9 MB in the beginning and 375.4 MB in the end (delta: 119.5 MB). Free memory was 239.8 MB in the beginning and 284.9 MB in the end (delta: -45.2 MB). Peak memory consumption was 139.2 MB. Max. memory is 16.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 51]: assertion always holds For all program executions holds that assertion always holds at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 24]: Loop Invariant Derived loop invariant: ((((((((((t <= 2 && (((1 <= s && s <= 1) && d <= 2) || ((s <= 0 && 0 <= s) && d <= 2))) && 2 <= t) || (((3 <= s && !sec) && d <= 9) && s <= 3)) || ((((t <= 0 && s <= 0) && d <= 0) && 0 <= t) && 0 <= s)) || (((1 <= s && !sec) && s <= 1) && d <= 7)) || (v_break && d <= 9)) || (((s <= 0 && !sec) && 0 <= s) && d <= 6)) || ((t <= 3 && 3 <= t) && (((d <= 3 && 1 <= s) && s <= 1) || ((d <= 3 && s <= 0) && 0 <= s)))) || ((1 <= t && (((s <= 0 && d <= 1) && 0 <= s) || ((1 <= s && s <= 1) && d <= 1))) && t <= 1)) || (((s <= 2 && d <= 8) && 2 <= s) && !sec)) || ((4 <= t && t <= 4) && (((1 <= s && d <= 4) && s <= 1) || ((s <= 0 && d <= 4) && 0 <= s))) - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 11 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 6.6s, OverallIterations: 15, TraceHistogramMax: 10, AutomataDifference: 0.6s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.5s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 231 SDtfs, 517 SDslu, 802 SDs, 0 SdLazy, 228 SolverSat, 25 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 446 GetRequests, 373 SyntacticMatches, 4 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=192occurred in iteration=12, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 15 MinimizatonAttempts, 39 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 1 LocationsWithAnnotation, 1 PreInvPairs, 54 NumberOfFragments, 182 HoareAnnotationTreeSize, 1 FomulaSimplifications, 65 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 1 FomulaSimplificationsInter, 575 FormulaSimplificationTreeSizeReductionInter, 0.4s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.3s SatisfiabilityAnalysisTime, 2.4s InterpolantComputationTime, 864 NumberOfCodeBlocks, 864 NumberOfCodeBlocksAsserted, 51 NumberOfCheckSat, 838 ConstructedInterpolants, 0 QuantifiedInterpolants, 99391 SizeOfPredicates, 2 NumberOfNonLiveVariables, 984 ConjunctsInSsa, 87 ConjunctsInUnsatCore, 26 InterpolantComputations, 4 PerfectInterpolantSequences, 1382/2822 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...