/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/array-eq-symm.wvr.bpl -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-770125f [2021-05-21 20:30:06,792 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-21 20:30:06,794 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-21 20:30:06,822 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-21 20:30:06,865 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 [2021-05-21 20:30:06,890 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-21 20:30:06,890 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-21 20:30:06,891 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-05-21 20:30:06,891 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-05-21 20:30:06,891 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-21 20:30:06,891 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-21 20:30:06,892 INFO L138 SettingsManager]: * Use SBE=true [2021-05-21 20:30:06,892 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-21 20:30:06,892 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-21 20:30:06,892 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-21 20:30:06,892 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-21 20:30:06,892 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-21 20:30:06,892 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-21 20:30:06,892 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-21 20:30:06,892 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-21 20:30:06,892 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-21 20:30:06,892 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-21 20:30:06,892 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-21 20:30:06,893 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-21 20:30:06,893 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-21 20:30:06,893 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-21 20:30:06,893 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-21 20:30:06,893 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-21 20:30:06,893 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-21 20:30:06,893 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-21 20:30:06,893 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-21 20:30:06,893 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-21 20:30:06,893 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-21 20:30:06,893 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-21 20:30:06,893 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-05-21 20:30:06,894 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-21 20:30:06,894 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-05-21 20:30:07,126 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-21 20:30:07,150 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-21 20:30:07,151 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-21 20:30:07,152 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2021-05-21 20:30:07,154 INFO L275 PluginConnector]: Boogie PL CUP Parser initialized [2021-05-21 20:30:07,155 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/weaver-benchmarks/generated/array-eq-symm.wvr.bpl [2021-05-21 20:30:07,173 INFO L110 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/weaver-benchmarks/generated/array-eq-symm.wvr.bpl' [2021-05-21 20:30:07,233 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-21 20:30:07,259 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-21 20:30:07,260 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-05-21 20:30:07,260 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-05-21 20:30:07,260 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-05-21 20:30:07,272 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "array-eq-symm.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 21.05 08:30:07" (1/1) ... [2021-05-21 20:30:07,276 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "array-eq-symm.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 21.05 08:30:07" (1/1) ... [2021-05-21 20:30:07,281 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-05-21 20:30:07,282 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-21 20:30:07,282 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-21 20:30:07,282 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-21 20:30:07,287 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "array-eq-symm.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 21.05 08:30:07" (1/1) ... [2021-05-21 20:30:07,287 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "array-eq-symm.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 21.05 08:30:07" (1/1) ... [2021-05-21 20:30:07,287 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "array-eq-symm.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 21.05 08:30:07" (1/1) ... [2021-05-21 20:30:07,288 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "array-eq-symm.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 21.05 08:30:07" (1/1) ... [2021-05-21 20:30:07,289 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "array-eq-symm.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 21.05 08:30:07" (1/1) ... [2021-05-21 20:30:07,291 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "array-eq-symm.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 21.05 08:30:07" (1/1) ... [2021-05-21 20:30:07,291 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "array-eq-symm.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 21.05 08:30:07" (1/1) ... [2021-05-21 20:30:07,292 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-21 20:30:07,292 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-21 20:30:07,292 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-21 20:30:07,293 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-21 20:30:07,294 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "array-eq-symm.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 21.05 08:30:07" (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 [2021-05-21 20:30:07,353 INFO L124 BoogieDeclarations]: Specification and implementation of procedure thread1 given in one single declaration [2021-05-21 20:30:07,353 INFO L130 BoogieDeclarations]: Found specification of procedure thread1 [2021-05-21 20:30:07,353 INFO L138 BoogieDeclarations]: Found implementation of procedure thread1 [2021-05-21 20:30:07,353 INFO L124 BoogieDeclarations]: Specification and implementation of procedure thread2 given in one single declaration [2021-05-21 20:30:07,353 INFO L130 BoogieDeclarations]: Found specification of procedure thread2 [2021-05-21 20:30:07,353 INFO L138 BoogieDeclarations]: Found implementation of procedure thread2 [2021-05-21 20:30:07,353 INFO L124 BoogieDeclarations]: Specification and implementation of procedure ULTIMATE.start given in one single declaration [2021-05-21 20:30:07,354 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-21 20:30:07,354 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-21 20:30:07,354 WARN L209 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to SingleStatement [2021-05-21 20:30:07,462 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-21 20:30:07,462 INFO L299 CfgBuilder]: Removed 0 assume(true) statements. [2021-05-21 20:30:07,463 INFO L202 PluginConnector]: Adding new model array-eq-symm.wvr.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.05 08:30:07 BoogieIcfgContainer [2021-05-21 20:30:07,463 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-21 20:30:07,464 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-21 20:30:07,465 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-21 20:30:07,466 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-21 20:30:07,467 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "array-eq-symm.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 21.05 08:30:07" (1/2) ... [2021-05-21 20:30:07,467 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@16e2cae6 and model type array-eq-symm.wvr.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.05 08:30:07, skipping insertion in model container [2021-05-21 20:30:07,467 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "array-eq-symm.wvr.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.05 08:30:07" (2/2) ... [2021-05-21 20:30:07,468 INFO L111 eAbstractionObserver]: Analyzing ICFG array-eq-symm.wvr.bpl [2021-05-21 20:30:07,471 WARN L148 ceAbstractionStarter]: Switching off computation of Hoare annotation because input is a concurrent program [2021-05-21 20:30:07,472 INFO L214 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-21 20:30:07,472 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-05-21 20:30:07,472 INFO L478 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2021-05-21 20:30:07,492 INFO L149 ThreadInstanceAdder]: Constructed 2 joinOtherThreadTransitions. [2021-05-21 20:30:07,506 INFO L255 AbstractCegarLoop]: Starting to check reachability of 3 error locations. [2021-05-21 20:30:07,531 INFO L378 AbstractCegarLoop]: Interprodecural is true [2021-05-21 20:30:07,531 INFO L379 AbstractCegarLoop]: Hoare is false [2021-05-21 20:30:07,531 INFO L380 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-21 20:30:07,531 INFO L381 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-21 20:30:07,532 INFO L382 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-21 20:30:07,532 INFO L383 AbstractCegarLoop]: Difference is false [2021-05-21 20:30:07,532 INFO L384 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-21 20:30:07,532 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-21 20:30:07,537 INFO L100 iNet2FiniteAutomaton]: Start petriNet2FiniteAutomaton. Operand has 28 places, 25 transitions, 66 flow [2021-05-21 20:30:07,573 INFO L122 iNet2FiniteAutomaton]: Finished petriNet2FiniteAutomaton. Result has 55 states, 53 states have (on average 2.207547169811321) internal successors, (117), 54 states have internal predecessors, (117), 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) [2021-05-21 20:30:07,575 INFO L276 IsEmpty]: Start isEmpty. Operand has 55 states, 53 states have (on average 2.207547169811321) internal successors, (117), 54 states have internal predecessors, (117), 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) [2021-05-21 20:30:07,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-21 20:30:07,590 INFO L513 BasicCegarLoop]: Found error trace [2021-05-21 20:30:07,590 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-21 20:30:07,590 INFO L430 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-21 20:30:07,593 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-21 20:30:07,593 INFO L82 PathProgramCache]: Analyzing trace with hash 1540416471, now seen corresponding path program 1 times [2021-05-21 20:30:07,599 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-21 20:30:07,599 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [122425114] [2021-05-21 20:30:07,599 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-21 20:30:07,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 20:30:07,717 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-21 20:30:07,718 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-21 20:30:07,718 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [122425114] [2021-05-21 20:30:07,718 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [122425114] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-21 20:30:07,719 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-21 20:30:07,719 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-05-21 20:30:07,719 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1717374030] [2021-05-21 20:30:07,722 INFO L462 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-21 20:30:07,722 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-21 20:30:07,732 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-21 20:30:07,733 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-21 20:30:07,735 INFO L87 Difference]: Start difference. First operand has 55 states, 53 states have (on average 2.207547169811321) internal successors, (117), 54 states have internal predecessors, (117), 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 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 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) [2021-05-21 20:30:07,801 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-21 20:30:07,801 INFO L93 Difference]: Finished difference Result 102 states and 226 transitions. [2021-05-21 20:30:07,801 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-21 20:30:07,802 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 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 11 [2021-05-21 20:30:07,802 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-21 20:30:07,808 INFO L225 Difference]: With dead ends: 102 [2021-05-21 20:30:07,809 INFO L226 Difference]: Without dead ends: 95 [2021-05-21 20:30:07,809 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 7.7ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-21 20:30:07,826 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2021-05-21 20:30:07,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 82. [2021-05-21 20:30:07,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 81 states have (on average 2.2839506172839505) internal successors, (185), 81 states have internal predecessors, (185), 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) [2021-05-21 20:30:07,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 185 transitions. [2021-05-21 20:30:07,857 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 185 transitions. Word has length 11 [2021-05-21 20:30:07,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-21 20:30:07,857 INFO L482 AbstractCegarLoop]: Abstraction has 82 states and 185 transitions. [2021-05-21 20:30:07,857 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 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) [2021-05-21 20:30:07,857 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 185 transitions. [2021-05-21 20:30:07,859 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-21 20:30:07,859 INFO L513 BasicCegarLoop]: Found error trace [2021-05-21 20:30:07,859 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-21 20:30:07,860 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-21 20:30:07,860 INFO L430 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-21 20:30:07,863 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-21 20:30:07,863 INFO L82 PathProgramCache]: Analyzing trace with hash -214361416, now seen corresponding path program 1 times [2021-05-21 20:30:07,864 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-21 20:30:07,864 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1469894203] [2021-05-21 20:30:07,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-21 20:30:07,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 20:30:07,923 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-21 20:30:07,923 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-21 20:30:07,923 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1469894203] [2021-05-21 20:30:07,923 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1469894203] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-21 20:30:07,923 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-21 20:30:07,923 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-21 20:30:07,924 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2049672944] [2021-05-21 20:30:07,924 INFO L462 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-21 20:30:07,924 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-21 20:30:07,925 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-21 20:30:07,925 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-21 20:30:07,925 INFO L87 Difference]: Start difference. First operand 82 states and 185 transitions. Second operand has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 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) [2021-05-21 20:30:07,973 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-21 20:30:07,974 INFO L93 Difference]: Finished difference Result 160 states and 352 transitions. [2021-05-21 20:30:07,974 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-21 20:30:07,974 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 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 14 [2021-05-21 20:30:07,974 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-21 20:30:07,975 INFO L225 Difference]: With dead ends: 160 [2021-05-21 20:30:07,975 INFO L226 Difference]: Without dead ends: 160 [2021-05-21 20:30:07,976 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 19.2ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-21 20:30:07,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2021-05-21 20:30:07,982 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 94. [2021-05-21 20:30:07,982 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 93 states have (on average 2.3118279569892475) internal successors, (215), 93 states have internal predecessors, (215), 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) [2021-05-21 20:30:07,982 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 215 transitions. [2021-05-21 20:30:07,983 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 215 transitions. Word has length 14 [2021-05-21 20:30:07,983 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-21 20:30:07,983 INFO L482 AbstractCegarLoop]: Abstraction has 94 states and 215 transitions. [2021-05-21 20:30:07,983 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 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) [2021-05-21 20:30:07,983 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 215 transitions. [2021-05-21 20:30:07,984 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-21 20:30:07,984 INFO L513 BasicCegarLoop]: Found error trace [2021-05-21 20:30:07,984 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-21 20:30:07,984 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-21 20:30:07,984 INFO L430 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-21 20:30:07,984 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-21 20:30:07,984 INFO L82 PathProgramCache]: Analyzing trace with hash 110711837, now seen corresponding path program 1 times [2021-05-21 20:30:07,985 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-21 20:30:07,985 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2081524271] [2021-05-21 20:30:07,985 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-21 20:30:07,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 20:30:08,009 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-21 20:30:08,009 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-21 20:30:08,010 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2081524271] [2021-05-21 20:30:08,010 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2081524271] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-21 20:30:08,010 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-21 20:30:08,010 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-21 20:30:08,010 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1026394130] [2021-05-21 20:30:08,010 INFO L462 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-21 20:30:08,011 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-21 20:30:08,011 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-21 20:30:08,011 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-21 20:30:08,011 INFO L87 Difference]: Start difference. First operand 94 states and 215 transitions. Second operand has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 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) [2021-05-21 20:30:08,051 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-21 20:30:08,051 INFO L93 Difference]: Finished difference Result 171 states and 385 transitions. [2021-05-21 20:30:08,051 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-21 20:30:08,051 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 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 14 [2021-05-21 20:30:08,052 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-21 20:30:08,052 INFO L225 Difference]: With dead ends: 171 [2021-05-21 20:30:08,053 INFO L226 Difference]: Without dead ends: 163 [2021-05-21 20:30:08,053 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 15.9ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-21 20:30:08,053 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2021-05-21 20:30:08,058 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 116. [2021-05-21 20:30:08,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 116 states, 115 states have (on average 2.2956521739130435) internal successors, (264), 115 states have internal predecessors, (264), 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) [2021-05-21 20:30:08,059 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 264 transitions. [2021-05-21 20:30:08,059 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 264 transitions. Word has length 14 [2021-05-21 20:30:08,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-21 20:30:08,060 INFO L482 AbstractCegarLoop]: Abstraction has 116 states and 264 transitions. [2021-05-21 20:30:08,060 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 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) [2021-05-21 20:30:08,060 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 264 transitions. [2021-05-21 20:30:08,060 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-21 20:30:08,061 INFO L513 BasicCegarLoop]: Found error trace [2021-05-21 20:30:08,061 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-21 20:30:08,061 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-21 20:30:08,061 INFO L430 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-21 20:30:08,061 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-21 20:30:08,061 INFO L82 PathProgramCache]: Analyzing trace with hash -632263843, now seen corresponding path program 2 times [2021-05-21 20:30:08,061 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-21 20:30:08,062 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2014049549] [2021-05-21 20:30:08,062 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-21 20:30:08,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 20:30:08,088 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-21 20:30:08,088 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-21 20:30:08,089 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2014049549] [2021-05-21 20:30:08,089 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2014049549] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:08,089 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2077335959] [2021-05-21 20:30:08,089 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 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 [2021-05-21 20:30:08,125 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-21 20:30:08,125 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-21 20:30:08,126 INFO L263 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-21 20:30:08,128 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-21 20:30:08,216 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-21 20:30:08,216 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2077335959] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:08,217 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-21 20:30:08,217 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3] total 3 [2021-05-21 20:30:08,217 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1365550634] [2021-05-21 20:30:08,217 INFO L462 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-21 20:30:08,217 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-21 20:30:08,218 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-21 20:30:08,218 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-21 20:30:08,219 INFO L87 Difference]: Start difference. First operand 116 states and 264 transitions. Second operand has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 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) [2021-05-21 20:30:08,281 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-21 20:30:08,281 INFO L93 Difference]: Finished difference Result 141 states and 326 transitions. [2021-05-21 20:30:08,281 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-21 20:30:08,282 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 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 14 [2021-05-21 20:30:08,282 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-21 20:30:08,283 INFO L225 Difference]: With dead ends: 141 [2021-05-21 20:30:08,283 INFO L226 Difference]: Without dead ends: 141 [2021-05-21 20:30:08,283 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 22.9ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-21 20:30:08,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2021-05-21 20:30:08,295 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 103. [2021-05-21 20:30:08,295 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 102 states have (on average 2.2941176470588234) internal successors, (234), 102 states have internal predecessors, (234), 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) [2021-05-21 20:30:08,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 234 transitions. [2021-05-21 20:30:08,296 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 234 transitions. Word has length 14 [2021-05-21 20:30:08,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-21 20:30:08,296 INFO L482 AbstractCegarLoop]: Abstraction has 103 states and 234 transitions. [2021-05-21 20:30:08,296 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 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) [2021-05-21 20:30:08,296 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 234 transitions. [2021-05-21 20:30:08,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-21 20:30:08,297 INFO L513 BasicCegarLoop]: Found error trace [2021-05-21 20:30:08,297 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-21 20:30:08,508 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-21 20:30:08,509 INFO L430 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-21 20:30:08,509 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-21 20:30:08,509 INFO L82 PathProgramCache]: Analyzing trace with hash -1209640048, now seen corresponding path program 2 times [2021-05-21 20:30:08,509 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-21 20:30:08,510 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1904220561] [2021-05-21 20:30:08,510 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-21 20:30:08,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 20:30:08,537 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-21 20:30:08,537 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-21 20:30:08,538 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1904220561] [2021-05-21 20:30:08,538 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1904220561] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-21 20:30:08,538 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-21 20:30:08,538 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-21 20:30:08,538 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [76983964] [2021-05-21 20:30:08,539 INFO L462 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-21 20:30:08,539 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-21 20:30:08,539 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-21 20:30:08,539 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-21 20:30:08,539 INFO L87 Difference]: Start difference. First operand 103 states and 234 transitions. Second operand has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 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) [2021-05-21 20:30:08,578 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-21 20:30:08,578 INFO L93 Difference]: Finished difference Result 144 states and 331 transitions. [2021-05-21 20:30:08,579 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-21 20:30:08,579 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 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 14 [2021-05-21 20:30:08,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-21 20:30:08,581 INFO L225 Difference]: With dead ends: 144 [2021-05-21 20:30:08,581 INFO L226 Difference]: Without dead ends: 142 [2021-05-21 20:30:08,582 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 16.0ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-21 20:30:08,583 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2021-05-21 20:30:08,592 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 103. [2021-05-21 20:30:08,593 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 102 states have (on average 2.284313725490196) internal successors, (233), 102 states have internal predecessors, (233), 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) [2021-05-21 20:30:08,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 233 transitions. [2021-05-21 20:30:08,593 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 233 transitions. Word has length 14 [2021-05-21 20:30:08,593 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-21 20:30:08,594 INFO L482 AbstractCegarLoop]: Abstraction has 103 states and 233 transitions. [2021-05-21 20:30:08,594 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 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) [2021-05-21 20:30:08,594 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 233 transitions. [2021-05-21 20:30:08,594 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-21 20:30:08,595 INFO L513 BasicCegarLoop]: Found error trace [2021-05-21 20:30:08,595 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-21 20:30:08,595 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-05-21 20:30:08,595 INFO L430 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-21 20:30:08,595 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-21 20:30:08,595 INFO L82 PathProgramCache]: Analyzing trace with hash -10930008, now seen corresponding path program 1 times [2021-05-21 20:30:08,595 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-21 20:30:08,595 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1274213496] [2021-05-21 20:30:08,596 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-21 20:30:08,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 20:30:08,645 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-21 20:30:08,646 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-21 20:30:08,646 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1274213496] [2021-05-21 20:30:08,646 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1274213496] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:08,646 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1903193917] [2021-05-21 20:30:08,646 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-21 20:30:08,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 20:30:08,679 INFO L263 TraceCheckSpWp]: Trace formula consists of 40 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-21 20:30:08,680 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-21 20:30:08,748 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-21 20:30:08,748 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1903193917] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:08,748 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-21 20:30:08,748 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 4] total 6 [2021-05-21 20:30:08,748 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2096879187] [2021-05-21 20:30:08,748 INFO L462 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-21 20:30:08,749 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-21 20:30:08,749 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-21 20:30:08,749 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-05-21 20:30:08,749 INFO L87 Difference]: Start difference. First operand 103 states and 233 transitions. Second operand has 7 states, 7 states have (on average 4.714285714285714) internal successors, (33), 6 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) [2021-05-21 20:30:08,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-21 20:30:08,814 INFO L93 Difference]: Finished difference Result 300 states and 674 transitions. [2021-05-21 20:30:08,815 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-21 20:30:08,815 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.714285714285714) internal successors, (33), 6 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 17 [2021-05-21 20:30:08,815 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-21 20:30:08,816 INFO L225 Difference]: With dead ends: 300 [2021-05-21 20:30:08,816 INFO L226 Difference]: Without dead ends: 286 [2021-05-21 20:30:08,816 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 35.6ms TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-05-21 20:30:08,817 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 286 states. [2021-05-21 20:30:08,819 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 286 to 143. [2021-05-21 20:30:08,820 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 142 states have (on average 2.352112676056338) internal successors, (334), 142 states have internal predecessors, (334), 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) [2021-05-21 20:30:08,820 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 334 transitions. [2021-05-21 20:30:08,820 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 334 transitions. Word has length 17 [2021-05-21 20:30:08,821 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-21 20:30:08,821 INFO L482 AbstractCegarLoop]: Abstraction has 143 states and 334 transitions. [2021-05-21 20:30:08,821 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 4.714285714285714) internal successors, (33), 6 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) [2021-05-21 20:30:08,821 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 334 transitions. [2021-05-21 20:30:08,822 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-21 20:30:08,822 INFO L513 BasicCegarLoop]: Found error trace [2021-05-21 20:30:08,822 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-21 20:30:09,039 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-21 20:30:09,040 INFO L430 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-21 20:30:09,040 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-21 20:30:09,040 INFO L82 PathProgramCache]: Analyzing trace with hash -1675583288, now seen corresponding path program 1 times [2021-05-21 20:30:09,040 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-21 20:30:09,041 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [172852278] [2021-05-21 20:30:09,041 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-21 20:30:09,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 20:30:09,076 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-21 20:30:09,076 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-21 20:30:09,076 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [172852278] [2021-05-21 20:30:09,076 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [172852278] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:09,077 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1647200307] [2021-05-21 20:30:09,077 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-21 20:30:09,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 20:30:09,098 INFO L263 TraceCheckSpWp]: Trace formula consists of 38 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-21 20:30:09,098 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-21 20:30:09,167 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-21 20:30:09,167 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1647200307] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:09,167 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-21 20:30:09,168 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 3] total 6 [2021-05-21 20:30:09,168 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2127712017] [2021-05-21 20:30:09,168 INFO L462 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-21 20:30:09,168 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-21 20:30:09,168 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-21 20:30:09,168 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-05-21 20:30:09,169 INFO L87 Difference]: Start difference. First operand 143 states and 334 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) [2021-05-21 20:30:09,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-21 20:30:09,211 INFO L93 Difference]: Finished difference Result 248 states and 569 transitions. [2021-05-21 20:30:09,211 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-21 20:30:09,211 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 17 [2021-05-21 20:30:09,211 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-21 20:30:09,212 INFO L225 Difference]: With dead ends: 248 [2021-05-21 20:30:09,212 INFO L226 Difference]: Without dead ends: 248 [2021-05-21 20:30:09,212 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 34.7ms TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-05-21 20:30:09,213 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 248 states. [2021-05-21 20:30:09,216 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 248 to 194. [2021-05-21 20:30:09,216 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 194 states, 193 states have (on average 2.4248704663212437) internal successors, (468), 193 states have internal predecessors, (468), 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) [2021-05-21 20:30:09,216 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 194 states to 194 states and 468 transitions. [2021-05-21 20:30:09,217 INFO L78 Accepts]: Start accepts. Automaton has 194 states and 468 transitions. Word has length 17 [2021-05-21 20:30:09,217 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-21 20:30:09,217 INFO L482 AbstractCegarLoop]: Abstraction has 194 states and 468 transitions. [2021-05-21 20:30:09,217 INFO L483 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) [2021-05-21 20:30:09,217 INFO L276 IsEmpty]: Start isEmpty. Operand 194 states and 468 transitions. [2021-05-21 20:30:09,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-21 20:30:09,218 INFO L513 BasicCegarLoop]: Found error trace [2021-05-21 20:30:09,218 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-21 20:30:09,426 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-21 20:30:09,426 INFO L430 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-21 20:30:09,426 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-21 20:30:09,427 INFO L82 PathProgramCache]: Analyzing trace with hash -1837184638, now seen corresponding path program 2 times [2021-05-21 20:30:09,427 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-21 20:30:09,427 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [885601533] [2021-05-21 20:30:09,427 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-21 20:30:09,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 20:30:09,464 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-21 20:30:09,464 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-21 20:30:09,464 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [885601533] [2021-05-21 20:30:09,464 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [885601533] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-21 20:30:09,464 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-21 20:30:09,464 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-21 20:30:09,464 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [959242639] [2021-05-21 20:30:09,464 INFO L462 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-21 20:30:09,465 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-21 20:30:09,465 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-21 20:30:09,465 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-21 20:30:09,465 INFO L87 Difference]: Start difference. First operand 194 states and 468 transitions. Second operand has 4 states, 4 states have (on average 4.25) 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) [2021-05-21 20:30:09,495 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-21 20:30:09,495 INFO L93 Difference]: Finished difference Result 311 states and 725 transitions. [2021-05-21 20:30:09,495 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-21 20:30:09,495 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.25) 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 17 [2021-05-21 20:30:09,495 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-21 20:30:09,497 INFO L225 Difference]: With dead ends: 311 [2021-05-21 20:30:09,498 INFO L226 Difference]: Without dead ends: 304 [2021-05-21 20:30:09,498 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 1 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 9.7ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-21 20:30:09,498 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 304 states. [2021-05-21 20:30:09,502 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 304 to 252. [2021-05-21 20:30:09,502 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 252 states, 251 states have (on average 2.4701195219123506) internal successors, (620), 251 states have internal predecessors, (620), 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) [2021-05-21 20:30:09,504 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 252 states to 252 states and 620 transitions. [2021-05-21 20:30:09,504 INFO L78 Accepts]: Start accepts. Automaton has 252 states and 620 transitions. Word has length 17 [2021-05-21 20:30:09,504 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-21 20:30:09,504 INFO L482 AbstractCegarLoop]: Abstraction has 252 states and 620 transitions. [2021-05-21 20:30:09,505 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 4.25) 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) [2021-05-21 20:30:09,505 INFO L276 IsEmpty]: Start isEmpty. Operand 252 states and 620 transitions. [2021-05-21 20:30:09,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-21 20:30:09,506 INFO L513 BasicCegarLoop]: Found error trace [2021-05-21 20:30:09,506 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-21 20:30:09,506 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-05-21 20:30:09,507 INFO L430 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-21 20:30:09,507 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-21 20:30:09,507 INFO L82 PathProgramCache]: Analyzing trace with hash -1678798648, now seen corresponding path program 1 times [2021-05-21 20:30:09,507 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-21 20:30:09,507 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1015896567] [2021-05-21 20:30:09,507 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-21 20:30:09,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 20:30:09,547 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-21 20:30:09,548 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-21 20:30:09,548 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1015896567] [2021-05-21 20:30:09,548 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1015896567] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-21 20:30:09,548 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-21 20:30:09,548 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-21 20:30:09,550 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1469621929] [2021-05-21 20:30:09,550 INFO L462 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-21 20:30:09,550 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-21 20:30:09,550 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-21 20:30:09,550 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-05-21 20:30:09,551 INFO L87 Difference]: Start difference. First operand 252 states and 620 transitions. Second operand has 4 states, 4 states have (on average 4.25) 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) [2021-05-21 20:30:09,571 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-21 20:30:09,571 INFO L93 Difference]: Finished difference Result 243 states and 574 transitions. [2021-05-21 20:30:09,572 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-21 20:30:09,572 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.25) 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 17 [2021-05-21 20:30:09,572 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-21 20:30:09,573 INFO L225 Difference]: With dead ends: 243 [2021-05-21 20:30:09,573 INFO L226 Difference]: Without dead ends: 208 [2021-05-21 20:30:09,574 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 9.1ms TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-05-21 20:30:09,574 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2021-05-21 20:30:09,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 208. [2021-05-21 20:30:09,577 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 208 states, 207 states have (on average 2.4009661835748792) internal successors, (497), 207 states have internal predecessors, (497), 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) [2021-05-21 20:30:09,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 208 states to 208 states and 497 transitions. [2021-05-21 20:30:09,579 INFO L78 Accepts]: Start accepts. Automaton has 208 states and 497 transitions. Word has length 17 [2021-05-21 20:30:09,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-21 20:30:09,579 INFO L482 AbstractCegarLoop]: Abstraction has 208 states and 497 transitions. [2021-05-21 20:30:09,579 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 4.25) 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) [2021-05-21 20:30:09,579 INFO L276 IsEmpty]: Start isEmpty. Operand 208 states and 497 transitions. [2021-05-21 20:30:09,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-21 20:30:09,579 INFO L513 BasicCegarLoop]: Found error trace [2021-05-21 20:30:09,579 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-21 20:30:09,580 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-05-21 20:30:09,580 INFO L430 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-21 20:30:09,580 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-21 20:30:09,580 INFO L82 PathProgramCache]: Analyzing trace with hash 1963262152, now seen corresponding path program 2 times [2021-05-21 20:30:09,580 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-21 20:30:09,580 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [210255837] [2021-05-21 20:30:09,580 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-21 20:30:09,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 20:30:09,622 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-21 20:30:09,623 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-21 20:30:09,623 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [210255837] [2021-05-21 20:30:09,623 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [210255837] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-21 20:30:09,623 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-21 20:30:09,623 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-21 20:30:09,623 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [162816547] [2021-05-21 20:30:09,624 INFO L462 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-21 20:30:09,624 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-21 20:30:09,624 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-21 20:30:09,624 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-21 20:30:09,624 INFO L87 Difference]: Start difference. First operand 208 states and 497 transitions. Second operand has 5 states, 5 states have (on average 3.4) internal successors, (17), 4 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) [2021-05-21 20:30:09,654 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-21 20:30:09,654 INFO L93 Difference]: Finished difference Result 222 states and 527 transitions. [2021-05-21 20:30:09,654 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-21 20:30:09,654 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 4 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 17 [2021-05-21 20:30:09,655 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-21 20:30:09,655 INFO L225 Difference]: With dead ends: 222 [2021-05-21 20:30:09,655 INFO L226 Difference]: Without dead ends: 222 [2021-05-21 20:30:09,656 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 12.2ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-21 20:30:09,656 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 222 states. [2021-05-21 20:30:09,659 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 222 to 222. [2021-05-21 20:30:09,659 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 222 states, 221 states have (on average 2.3846153846153846) internal successors, (527), 221 states have internal predecessors, (527), 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) [2021-05-21 20:30:09,660 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 222 states to 222 states and 527 transitions. [2021-05-21 20:30:09,660 INFO L78 Accepts]: Start accepts. Automaton has 222 states and 527 transitions. Word has length 17 [2021-05-21 20:30:09,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-21 20:30:09,660 INFO L482 AbstractCegarLoop]: Abstraction has 222 states and 527 transitions. [2021-05-21 20:30:09,660 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 4 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) [2021-05-21 20:30:09,660 INFO L276 IsEmpty]: Start isEmpty. Operand 222 states and 527 transitions. [2021-05-21 20:30:09,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-21 20:30:09,661 INFO L513 BasicCegarLoop]: Found error trace [2021-05-21 20:30:09,661 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-21 20:30:09,661 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-05-21 20:30:09,661 INFO L430 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-21 20:30:09,661 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-21 20:30:09,662 INFO L82 PathProgramCache]: Analyzing trace with hash 215291064, now seen corresponding path program 3 times [2021-05-21 20:30:09,662 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-21 20:30:09,662 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1745188962] [2021-05-21 20:30:09,662 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-21 20:30:09,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 20:30:09,699 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-21 20:30:09,699 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-21 20:30:09,699 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1745188962] [2021-05-21 20:30:09,699 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1745188962] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:09,699 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1925215682] [2021-05-21 20:30:09,699 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 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 [2021-05-21 20:30:09,734 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-21 20:30:09,734 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-21 20:30:09,735 INFO L263 TraceCheckSpWp]: Trace formula consists of 47 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-21 20:30:09,735 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-21 20:30:09,957 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-21 20:30:09,958 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1925215682] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-21 20:30:09,958 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-05-21 20:30:09,958 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [5] total 12 [2021-05-21 20:30:09,958 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [589878291] [2021-05-21 20:30:09,958 INFO L462 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-21 20:30:09,958 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-21 20:30:09,959 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-21 20:30:09,959 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=111, Unknown=0, NotChecked=0, Total=156 [2021-05-21 20:30:09,959 INFO L87 Difference]: Start difference. First operand 222 states and 527 transitions. Second operand has 10 states, 10 states have (on average 2.0) internal successors, (20), 9 states have internal predecessors, (20), 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) [2021-05-21 20:30:10,114 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-21 20:30:10,114 INFO L93 Difference]: Finished difference Result 421 states and 987 transitions. [2021-05-21 20:30:10,114 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-21 20:30:10,114 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.0) internal successors, (20), 9 states have internal predecessors, (20), 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 20 [2021-05-21 20:30:10,115 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-21 20:30:10,116 INFO L225 Difference]: With dead ends: 421 [2021-05-21 20:30:10,116 INFO L226 Difference]: Without dead ends: 414 [2021-05-21 20:30:10,116 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 12 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 62 ImplicationChecksByTransitivity, 193.0ms TimeCoverageRelationStatistics Valid=85, Invalid=221, Unknown=0, NotChecked=0, Total=306 [2021-05-21 20:30:10,117 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 414 states. [2021-05-21 20:30:10,120 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 414 to 278. [2021-05-21 20:30:10,120 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 278 states, 277 states have (on average 2.4151624548736463) internal successors, (669), 277 states have internal predecessors, (669), 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) [2021-05-21 20:30:10,121 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 278 states to 278 states and 669 transitions. [2021-05-21 20:30:10,121 INFO L78 Accepts]: Start accepts. Automaton has 278 states and 669 transitions. Word has length 20 [2021-05-21 20:30:10,121 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-21 20:30:10,121 INFO L482 AbstractCegarLoop]: Abstraction has 278 states and 669 transitions. [2021-05-21 20:30:10,121 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.0) internal successors, (20), 9 states have internal predecessors, (20), 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) [2021-05-21 20:30:10,121 INFO L276 IsEmpty]: Start isEmpty. Operand 278 states and 669 transitions. [2021-05-21 20:30:10,122 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-21 20:30:10,122 INFO L513 BasicCegarLoop]: Found error trace [2021-05-21 20:30:10,122 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-21 20:30:10,338 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-21 20:30:10,338 INFO L430 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-21 20:30:10,339 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-21 20:30:10,339 INFO L82 PathProgramCache]: Analyzing trace with hash -2043788104, now seen corresponding path program 4 times [2021-05-21 20:30:10,339 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-21 20:30:10,339 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [306049894] [2021-05-21 20:30:10,339 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-21 20:30:10,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 20:30:10,373 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-21 20:30:10,373 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-21 20:30:10,375 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [306049894] [2021-05-21 20:30:10,375 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [306049894] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:10,375 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [512484106] [2021-05-21 20:30:10,375 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 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 [2021-05-21 20:30:10,403 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-21 20:30:10,403 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-21 20:30:10,403 INFO L263 TraceCheckSpWp]: Trace formula consists of 47 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-21 20:30:10,405 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-21 20:30:10,488 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-21 20:30:10,488 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [512484106] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-21 20:30:10,488 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-05-21 20:30:10,488 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [5] total 8 [2021-05-21 20:30:10,488 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1444505824] [2021-05-21 20:30:10,488 INFO L462 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-21 20:30:10,488 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-21 20:30:10,489 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-21 20:30:10,489 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-21 20:30:10,489 INFO L87 Difference]: Start difference. First operand 278 states and 669 transitions. Second operand has 7 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 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) [2021-05-21 20:30:10,600 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-21 20:30:10,600 INFO L93 Difference]: Finished difference Result 592 states and 1376 transitions. [2021-05-21 20:30:10,600 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-21 20:30:10,600 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 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 20 [2021-05-21 20:30:10,600 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-21 20:30:10,602 INFO L225 Difference]: With dead ends: 592 [2021-05-21 20:30:10,602 INFO L226 Difference]: Without dead ends: 592 [2021-05-21 20:30:10,602 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 61.4ms TimeCoverageRelationStatistics Valid=39, Invalid=51, Unknown=0, NotChecked=0, Total=90 [2021-05-21 20:30:10,603 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 592 states. [2021-05-21 20:30:10,608 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 592 to 376. [2021-05-21 20:30:10,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 376 states, 375 states have (on average 2.541333333333333) internal successors, (953), 375 states have internal predecessors, (953), 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) [2021-05-21 20:30:10,609 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 376 states to 376 states and 953 transitions. [2021-05-21 20:30:10,609 INFO L78 Accepts]: Start accepts. Automaton has 376 states and 953 transitions. Word has length 20 [2021-05-21 20:30:10,609 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-21 20:30:10,609 INFO L482 AbstractCegarLoop]: Abstraction has 376 states and 953 transitions. [2021-05-21 20:30:10,609 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 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) [2021-05-21 20:30:10,609 INFO L276 IsEmpty]: Start isEmpty. Operand 376 states and 953 transitions. [2021-05-21 20:30:10,610 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-21 20:30:10,610 INFO L513 BasicCegarLoop]: Found error trace [2021-05-21 20:30:10,610 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-21 20:30:10,825 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-05-21 20:30:10,825 INFO L430 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-21 20:30:10,825 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-21 20:30:10,825 INFO L82 PathProgramCache]: Analyzing trace with hash -1610963566, now seen corresponding path program 5 times [2021-05-21 20:30:10,825 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-21 20:30:10,825 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1110417494] [2021-05-21 20:30:10,825 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-21 20:30:10,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 20:30:10,866 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-21 20:30:10,866 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-21 20:30:10,866 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1110417494] [2021-05-21 20:30:10,867 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1110417494] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:10,867 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [495586205] [2021-05-21 20:30:10,867 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 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 [2021-05-21 20:30:10,890 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-05-21 20:30:10,890 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-21 20:30:10,890 INFO L263 TraceCheckSpWp]: Trace formula consists of 47 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-21 20:30:10,891 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-21 20:30:10,939 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-21 20:30:10,939 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [495586205] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:10,939 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-21 20:30:10,939 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6] total 6 [2021-05-21 20:30:10,939 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [613111377] [2021-05-21 20:30:10,940 INFO L462 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-21 20:30:10,940 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-21 20:30:10,940 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-21 20:30:10,940 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-05-21 20:30:10,940 INFO L87 Difference]: Start difference. First operand 376 states and 953 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) [2021-05-21 20:30:11,045 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-21 20:30:11,045 INFO L93 Difference]: Finished difference Result 751 states and 1816 transitions. [2021-05-21 20:30:11,045 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-21 20:30:11,046 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 20 [2021-05-21 20:30:11,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-21 20:30:11,048 INFO L225 Difference]: With dead ends: 751 [2021-05-21 20:30:11,048 INFO L226 Difference]: Without dead ends: 751 [2021-05-21 20:30:11,048 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 18 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 47.4ms TimeCoverageRelationStatistics Valid=36, Invalid=54, Unknown=0, NotChecked=0, Total=90 [2021-05-21 20:30:11,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 751 states. [2021-05-21 20:30:11,056 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 751 to 527. [2021-05-21 20:30:11,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 527 states, 526 states have (on average 2.659695817490494) internal successors, (1399), 526 states have internal predecessors, (1399), 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) [2021-05-21 20:30:11,058 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 527 states to 527 states and 1399 transitions. [2021-05-21 20:30:11,058 INFO L78 Accepts]: Start accepts. Automaton has 527 states and 1399 transitions. Word has length 20 [2021-05-21 20:30:11,058 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-21 20:30:11,058 INFO L482 AbstractCegarLoop]: Abstraction has 527 states and 1399 transitions. [2021-05-21 20:30:11,058 INFO L483 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) [2021-05-21 20:30:11,058 INFO L276 IsEmpty]: Start isEmpty. Operand 527 states and 1399 transitions. [2021-05-21 20:30:11,059 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-21 20:30:11,059 INFO L513 BasicCegarLoop]: Found error trace [2021-05-21 20:30:11,059 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-21 20:30:11,272 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-21 20:30:11,273 INFO L430 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-21 20:30:11,273 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-21 20:30:11,273 INFO L82 PathProgramCache]: Analyzing trace with hash 1876435461, now seen corresponding path program 6 times [2021-05-21 20:30:11,273 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-21 20:30:11,273 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [573831209] [2021-05-21 20:30:11,273 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-21 20:30:11,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 20:30:11,297 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-21 20:30:11,297 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-21 20:30:11,297 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [573831209] [2021-05-21 20:30:11,297 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [573831209] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:11,297 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [862831075] [2021-05-21 20:30:11,297 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 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 [2021-05-21 20:30:11,319 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-21 20:30:11,319 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-21 20:30:11,319 INFO L263 TraceCheckSpWp]: Trace formula consists of 47 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-21 20:30:11,320 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-21 20:30:11,357 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-21 20:30:11,357 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [862831075] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:11,357 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-21 20:30:11,357 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5] total 5 [2021-05-21 20:30:11,357 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1167136845] [2021-05-21 20:30:11,357 INFO L462 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-21 20:30:11,357 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-21 20:30:11,358 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-21 20:30:11,358 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-21 20:30:11,358 INFO L87 Difference]: Start difference. First operand 527 states and 1399 transitions. Second operand has 6 states, 6 states have (on average 4.166666666666667) internal successors, (25), 5 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) [2021-05-21 20:30:11,412 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-21 20:30:11,412 INFO L93 Difference]: Finished difference Result 960 states and 2485 transitions. [2021-05-21 20:30:11,412 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-21 20:30:11,413 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.166666666666667) internal successors, (25), 5 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) Word has length 20 [2021-05-21 20:30:11,413 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-21 20:30:11,416 INFO L225 Difference]: With dead ends: 960 [2021-05-21 20:30:11,416 INFO L226 Difference]: Without dead ends: 956 [2021-05-21 20:30:11,416 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 20.4ms TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-21 20:30:11,417 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 956 states. [2021-05-21 20:30:11,428 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 956 to 785. [2021-05-21 20:30:11,429 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 785 states, 784 states have (on average 2.752551020408163) internal successors, (2158), 784 states have internal predecessors, (2158), 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) [2021-05-21 20:30:11,431 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 785 states to 785 states and 2158 transitions. [2021-05-21 20:30:11,432 INFO L78 Accepts]: Start accepts. Automaton has 785 states and 2158 transitions. Word has length 20 [2021-05-21 20:30:11,432 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-21 20:30:11,432 INFO L482 AbstractCegarLoop]: Abstraction has 785 states and 2158 transitions. [2021-05-21 20:30:11,432 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 4.166666666666667) internal successors, (25), 5 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) [2021-05-21 20:30:11,432 INFO L276 IsEmpty]: Start isEmpty. Operand 785 states and 2158 transitions. [2021-05-21 20:30:11,433 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-21 20:30:11,433 INFO L513 BasicCegarLoop]: Found error trace [2021-05-21 20:30:11,433 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-21 20:30:11,644 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-21 20:30:11,644 INFO L430 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-21 20:30:11,645 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-21 20:30:11,645 INFO L82 PathProgramCache]: Analyzing trace with hash 1254555051, now seen corresponding path program 7 times [2021-05-21 20:30:11,645 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-21 20:30:11,645 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [694839830] [2021-05-21 20:30:11,645 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-21 20:30:11,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 20:30:11,668 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-21 20:30:11,668 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-21 20:30:11,668 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [694839830] [2021-05-21 20:30:11,668 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [694839830] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:11,668 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [324408285] [2021-05-21 20:30:11,668 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 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 [2021-05-21 20:30:11,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 20:30:11,703 INFO L263 TraceCheckSpWp]: Trace formula consists of 47 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-21 20:30:11,704 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-21 20:30:11,735 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-21 20:30:11,735 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [324408285] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:11,735 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-21 20:30:11,735 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5] total 5 [2021-05-21 20:30:11,736 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [573960953] [2021-05-21 20:30:11,736 INFO L462 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-21 20:30:11,736 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-21 20:30:11,736 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-21 20:30:11,736 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-21 20:30:11,736 INFO L87 Difference]: Start difference. First operand 785 states and 2158 transitions. Second operand has 6 states, 6 states have (on average 4.166666666666667) internal successors, (25), 5 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) [2021-05-21 20:30:11,807 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-21 20:30:11,807 INFO L93 Difference]: Finished difference Result 966 states and 2482 transitions. [2021-05-21 20:30:11,808 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-21 20:30:11,808 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.166666666666667) internal successors, (25), 5 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) Word has length 20 [2021-05-21 20:30:11,808 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-21 20:30:11,811 INFO L225 Difference]: With dead ends: 966 [2021-05-21 20:30:11,811 INFO L226 Difference]: Without dead ends: 966 [2021-05-21 20:30:11,811 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 31.6ms TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-05-21 20:30:11,812 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 966 states. [2021-05-21 20:30:11,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 966 to 785. [2021-05-21 20:30:11,825 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 785 states, 784 states have (on average 2.739795918367347) internal successors, (2148), 784 states have internal predecessors, (2148), 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) [2021-05-21 20:30:11,827 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 785 states to 785 states and 2148 transitions. [2021-05-21 20:30:11,828 INFO L78 Accepts]: Start accepts. Automaton has 785 states and 2148 transitions. Word has length 20 [2021-05-21 20:30:11,828 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-21 20:30:11,828 INFO L482 AbstractCegarLoop]: Abstraction has 785 states and 2148 transitions. [2021-05-21 20:30:11,828 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 4.166666666666667) internal successors, (25), 5 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) [2021-05-21 20:30:11,828 INFO L276 IsEmpty]: Start isEmpty. Operand 785 states and 2148 transitions. [2021-05-21 20:30:11,829 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-21 20:30:11,829 INFO L513 BasicCegarLoop]: Found error trace [2021-05-21 20:30:11,829 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-21 20:30:12,044 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-05-21 20:30:12,047 INFO L430 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-21 20:30:12,047 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-21 20:30:12,047 INFO L82 PathProgramCache]: Analyzing trace with hash 322738604, now seen corresponding path program 8 times [2021-05-21 20:30:12,047 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-21 20:30:12,047 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1745855635] [2021-05-21 20:30:12,047 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-21 20:30:12,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 20:30:12,078 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-21 20:30:12,078 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-21 20:30:12,078 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1745855635] [2021-05-21 20:30:12,078 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1745855635] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:12,078 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1838377389] [2021-05-21 20:30:12,078 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 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 [2021-05-21 20:30:12,105 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-21 20:30:12,106 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-21 20:30:12,106 INFO L263 TraceCheckSpWp]: Trace formula consists of 47 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-21 20:30:12,107 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-21 20:30:12,147 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-21 20:30:12,148 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1838377389] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:12,148 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-21 20:30:12,148 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 4 [2021-05-21 20:30:12,148 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [431237456] [2021-05-21 20:30:12,148 INFO L462 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-21 20:30:12,148 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-21 20:30:12,148 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-21 20:30:12,149 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-21 20:30:12,149 INFO L87 Difference]: Start difference. First operand 785 states and 2148 transitions. Second operand has 5 states, 5 states have (on average 4.0) internal successors, (20), 4 states have internal predecessors, (20), 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) [2021-05-21 20:30:12,201 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-21 20:30:12,201 INFO L93 Difference]: Finished difference Result 861 states and 2300 transitions. [2021-05-21 20:30:12,201 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-21 20:30:12,201 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.0) internal successors, (20), 4 states have internal predecessors, (20), 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 20 [2021-05-21 20:30:12,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-21 20:30:12,204 INFO L225 Difference]: With dead ends: 861 [2021-05-21 20:30:12,204 INFO L226 Difference]: Without dead ends: 858 [2021-05-21 20:30:12,204 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 17.6ms TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-21 20:30:12,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 858 states. [2021-05-21 20:30:12,215 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 858 to 781. [2021-05-21 20:30:12,216 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 781 states, 780 states have (on average 2.7346153846153847) internal successors, (2133), 780 states have internal predecessors, (2133), 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) [2021-05-21 20:30:12,218 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 781 states to 781 states and 2133 transitions. [2021-05-21 20:30:12,218 INFO L78 Accepts]: Start accepts. Automaton has 781 states and 2133 transitions. Word has length 20 [2021-05-21 20:30:12,218 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-21 20:30:12,218 INFO L482 AbstractCegarLoop]: Abstraction has 781 states and 2133 transitions. [2021-05-21 20:30:12,218 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 4.0) internal successors, (20), 4 states have internal predecessors, (20), 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) [2021-05-21 20:30:12,219 INFO L276 IsEmpty]: Start isEmpty. Operand 781 states and 2133 transitions. [2021-05-21 20:30:12,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-21 20:30:12,220 INFO L513 BasicCegarLoop]: Found error trace [2021-05-21 20:30:12,220 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-21 20:30:12,432 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-21 20:30:12,433 INFO L430 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-21 20:30:12,433 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-21 20:30:12,433 INFO L82 PathProgramCache]: Analyzing trace with hash -1057166664, now seen corresponding path program 9 times [2021-05-21 20:30:12,433 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-21 20:30:12,433 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1611368923] [2021-05-21 20:30:12,433 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-21 20:30:12,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 20:30:12,463 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-21 20:30:12,463 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-21 20:30:12,463 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1611368923] [2021-05-21 20:30:12,463 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1611368923] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:12,463 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1315097137] [2021-05-21 20:30:12,463 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 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 [2021-05-21 20:30:12,489 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-21 20:30:12,489 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-21 20:30:12,490 INFO L263 TraceCheckSpWp]: Trace formula consists of 47 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-21 20:30:12,490 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-21 20:30:12,530 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-21 20:30:12,530 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1315097137] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:12,530 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-21 20:30:12,530 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 4 [2021-05-21 20:30:12,530 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1095213064] [2021-05-21 20:30:12,530 INFO L462 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-21 20:30:12,530 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-21 20:30:12,531 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-21 20:30:12,531 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-21 20:30:12,531 INFO L87 Difference]: Start difference. First operand 781 states and 2133 transitions. Second operand has 5 states, 5 states have (on average 4.0) internal successors, (20), 4 states have internal predecessors, (20), 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) [2021-05-21 20:30:12,592 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-21 20:30:12,592 INFO L93 Difference]: Finished difference Result 1114 states and 2914 transitions. [2021-05-21 20:30:12,593 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-21 20:30:12,593 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.0) internal successors, (20), 4 states have internal predecessors, (20), 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 20 [2021-05-21 20:30:12,593 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-21 20:30:12,596 INFO L225 Difference]: With dead ends: 1114 [2021-05-21 20:30:12,596 INFO L226 Difference]: Without dead ends: 1114 [2021-05-21 20:30:12,596 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 30.5ms TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-05-21 20:30:12,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1114 states. [2021-05-21 20:30:12,610 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1114 to 899. [2021-05-21 20:30:12,611 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 899 states, 898 states have (on average 2.771714922048998) internal successors, (2489), 898 states have internal predecessors, (2489), 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) [2021-05-21 20:30:12,613 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 899 states to 899 states and 2489 transitions. [2021-05-21 20:30:12,613 INFO L78 Accepts]: Start accepts. Automaton has 899 states and 2489 transitions. Word has length 20 [2021-05-21 20:30:12,613 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-21 20:30:12,613 INFO L482 AbstractCegarLoop]: Abstraction has 899 states and 2489 transitions. [2021-05-21 20:30:12,613 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 4.0) internal successors, (20), 4 states have internal predecessors, (20), 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) [2021-05-21 20:30:12,613 INFO L276 IsEmpty]: Start isEmpty. Operand 899 states and 2489 transitions. [2021-05-21 20:30:12,614 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-21 20:30:12,615 INFO L513 BasicCegarLoop]: Found error trace [2021-05-21 20:30:12,615 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-21 20:30:12,824 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-05-21 20:30:12,825 INFO L430 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-21 20:30:12,825 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-21 20:30:12,825 INFO L82 PathProgramCache]: Analyzing trace with hash -1634542869, now seen corresponding path program 10 times [2021-05-21 20:30:12,825 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-21 20:30:12,825 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1699291051] [2021-05-21 20:30:12,825 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-21 20:30:12,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 20:30:12,853 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-21 20:30:12,854 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-21 20:30:12,854 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1699291051] [2021-05-21 20:30:12,854 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1699291051] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:12,854 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1176668725] [2021-05-21 20:30:12,854 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 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 [2021-05-21 20:30:12,875 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-21 20:30:12,876 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-21 20:30:12,876 INFO L263 TraceCheckSpWp]: Trace formula consists of 47 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-21 20:30:12,877 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-21 20:30:12,914 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-21 20:30:12,914 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1176668725] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:12,914 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-21 20:30:12,915 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5] total 5 [2021-05-21 20:30:12,915 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [792451507] [2021-05-21 20:30:12,915 INFO L462 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-21 20:30:12,915 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-21 20:30:12,915 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-21 20:30:12,915 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-21 20:30:12,915 INFO L87 Difference]: Start difference. First operand 899 states and 2489 transitions. Second operand has 6 states, 6 states have (on average 4.166666666666667) internal successors, (25), 5 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) [2021-05-21 20:30:12,978 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-21 20:30:12,978 INFO L93 Difference]: Finished difference Result 1380 states and 3776 transitions. [2021-05-21 20:30:12,978 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-21 20:30:12,979 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.166666666666667) internal successors, (25), 5 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) Word has length 20 [2021-05-21 20:30:12,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-21 20:30:12,983 INFO L225 Difference]: With dead ends: 1380 [2021-05-21 20:30:12,983 INFO L226 Difference]: Without dead ends: 1370 [2021-05-21 20:30:12,983 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 25.4ms TimeCoverageRelationStatistics Valid=24, Invalid=32, Unknown=0, NotChecked=0, Total=56 [2021-05-21 20:30:12,984 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1370 states. [2021-05-21 20:30:13,001 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1370 to 1228. [2021-05-21 20:30:13,002 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1228 states, 1227 states have (on average 2.8247758761206194) internal successors, (3466), 1227 states have internal predecessors, (3466), 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) [2021-05-21 20:30:13,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1228 states to 1228 states and 3466 transitions. [2021-05-21 20:30:13,005 INFO L78 Accepts]: Start accepts. Automaton has 1228 states and 3466 transitions. Word has length 20 [2021-05-21 20:30:13,005 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-21 20:30:13,005 INFO L482 AbstractCegarLoop]: Abstraction has 1228 states and 3466 transitions. [2021-05-21 20:30:13,005 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 4.166666666666667) internal successors, (25), 5 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) [2021-05-21 20:30:13,005 INFO L276 IsEmpty]: Start isEmpty. Operand 1228 states and 3466 transitions. [2021-05-21 20:30:13,007 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-21 20:30:13,007 INFO L513 BasicCegarLoop]: Found error trace [2021-05-21 20:30:13,007 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-21 20:30:13,216 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-05-21 20:30:13,216 INFO L430 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-21 20:30:13,217 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-21 20:30:13,217 INFO L82 PathProgramCache]: Analyzing trace with hash 2038544017, now seen corresponding path program 11 times [2021-05-21 20:30:13,217 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-21 20:30:13,217 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1723358784] [2021-05-21 20:30:13,217 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-21 20:30:13,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 20:30:13,245 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-21 20:30:13,245 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-21 20:30:13,245 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1723358784] [2021-05-21 20:30:13,245 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1723358784] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:13,245 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2110662595] [2021-05-21 20:30:13,245 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 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-21 20:30:13,271 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-21 20:30:13,271 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-21 20:30:13,271 INFO L263 TraceCheckSpWp]: Trace formula consists of 47 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-21 20:30:13,273 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-21 20:30:13,301 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-21 20:30:13,302 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2110662595] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:13,302 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-21 20:30:13,302 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5] total 5 [2021-05-21 20:30:13,302 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1133753576] [2021-05-21 20:30:13,302 INFO L462 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-21 20:30:13,302 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-21 20:30:13,302 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-21 20:30:13,302 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-21 20:30:13,303 INFO L87 Difference]: Start difference. First operand 1228 states and 3466 transitions. Second operand has 6 states, 6 states have (on average 4.166666666666667) internal successors, (25), 5 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) [2021-05-21 20:30:13,371 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-21 20:30:13,371 INFO L93 Difference]: Finished difference Result 1400 states and 3809 transitions. [2021-05-21 20:30:13,372 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-21 20:30:13,372 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.166666666666667) internal successors, (25), 5 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) Word has length 20 [2021-05-21 20:30:13,372 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-21 20:30:13,376 INFO L225 Difference]: With dead ends: 1400 [2021-05-21 20:30:13,376 INFO L226 Difference]: Without dead ends: 1400 [2021-05-21 20:30:13,376 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 27.0ms TimeCoverageRelationStatistics Valid=24, Invalid=32, Unknown=0, NotChecked=0, Total=56 [2021-05-21 20:30:13,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1400 states. [2021-05-21 20:30:13,391 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1400 to 1248. [2021-05-21 20:30:13,393 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1248 states, 1247 states have (on average 2.814755412991179) internal successors, (3510), 1247 states have internal predecessors, (3510), 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) [2021-05-21 20:30:13,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1248 states to 1248 states and 3510 transitions. [2021-05-21 20:30:13,395 INFO L78 Accepts]: Start accepts. Automaton has 1248 states and 3510 transitions. Word has length 20 [2021-05-21 20:30:13,396 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-21 20:30:13,396 INFO L482 AbstractCegarLoop]: Abstraction has 1248 states and 3510 transitions. [2021-05-21 20:30:13,396 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 4.166666666666667) internal successors, (25), 5 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) [2021-05-21 20:30:13,396 INFO L276 IsEmpty]: Start isEmpty. Operand 1248 states and 3510 transitions. [2021-05-21 20:30:13,397 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-21 20:30:13,397 INFO L513 BasicCegarLoop]: Found error trace [2021-05-21 20:30:13,397 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-21 20:30:13,616 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-05-21 20:30:13,617 INFO L430 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-21 20:30:13,617 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-21 20:30:13,617 INFO L82 PathProgramCache]: Analyzing trace with hash 1106727570, now seen corresponding path program 12 times [2021-05-21 20:30:13,617 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-21 20:30:13,617 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [651544021] [2021-05-21 20:30:13,617 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-21 20:30:13,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 20:30:13,637 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-21 20:30:13,637 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-21 20:30:13,637 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [651544021] [2021-05-21 20:30:13,637 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [651544021] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:13,637 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2017363656] [2021-05-21 20:30:13,637 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 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-21 20:30:13,672 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-05-21 20:30:13,672 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-21 20:30:13,672 INFO L263 TraceCheckSpWp]: Trace formula consists of 47 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-21 20:30:13,673 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-21 20:30:13,703 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-21 20:30:13,703 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2017363656] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:13,703 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-21 20:30:13,703 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 4 [2021-05-21 20:30:13,704 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [463344435] [2021-05-21 20:30:13,704 INFO L462 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-21 20:30:13,704 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-21 20:30:13,704 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-21 20:30:13,704 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-21 20:30:13,704 INFO L87 Difference]: Start difference. First operand 1248 states and 3510 transitions. Second operand has 5 states, 5 states have (on average 4.0) internal successors, (20), 4 states have internal predecessors, (20), 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) [2021-05-21 20:30:13,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-21 20:30:13,753 INFO L93 Difference]: Finished difference Result 1485 states and 3980 transitions. [2021-05-21 20:30:13,753 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-21 20:30:13,753 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.0) internal successors, (20), 4 states have internal predecessors, (20), 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 20 [2021-05-21 20:30:13,753 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-21 20:30:13,757 INFO L225 Difference]: With dead ends: 1485 [2021-05-21 20:30:13,757 INFO L226 Difference]: Without dead ends: 1482 [2021-05-21 20:30:13,758 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 16.8ms TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-05-21 20:30:13,760 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1482 states. [2021-05-21 20:30:13,776 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1482 to 1250. [2021-05-21 20:30:13,778 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1250 states, 1249 states have (on average 2.8086469175340274) internal successors, (3508), 1249 states have internal predecessors, (3508), 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) [2021-05-21 20:30:13,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1250 states to 1250 states and 3508 transitions. [2021-05-21 20:30:13,780 INFO L78 Accepts]: Start accepts. Automaton has 1250 states and 3508 transitions. Word has length 20 [2021-05-21 20:30:13,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-21 20:30:13,781 INFO L482 AbstractCegarLoop]: Abstraction has 1250 states and 3508 transitions. [2021-05-21 20:30:13,781 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 4.0) internal successors, (20), 4 states have internal predecessors, (20), 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) [2021-05-21 20:30:13,781 INFO L276 IsEmpty]: Start isEmpty. Operand 1250 states and 3508 transitions. [2021-05-21 20:30:13,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-21 20:30:13,782 INFO L513 BasicCegarLoop]: Found error trace [2021-05-21 20:30:13,782 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-21 20:30:13,988 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,14 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-21 20:30:13,989 INFO L430 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-21 20:30:13,989 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-21 20:30:13,989 INFO L82 PathProgramCache]: Analyzing trace with hash 400971561, now seen corresponding path program 13 times [2021-05-21 20:30:13,989 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-21 20:30:13,989 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [700166101] [2021-05-21 20:30:13,989 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-21 20:30:13,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 20:30:14,030 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-21 20:30:14,030 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-21 20:30:14,030 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [700166101] [2021-05-21 20:30:14,031 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [700166101] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:14,031 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [993329590] [2021-05-21 20:30:14,031 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 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-21 20:30:14,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 20:30:14,060 INFO L263 TraceCheckSpWp]: Trace formula consists of 47 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-21 20:30:14,061 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-21 20:30:14,105 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-21 20:30:14,105 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [993329590] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:14,105 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-21 20:30:14,105 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6] total 6 [2021-05-21 20:30:14,105 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1711616806] [2021-05-21 20:30:14,105 INFO L462 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-21 20:30:14,105 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-21 20:30:14,106 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-21 20:30:14,106 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-05-21 20:30:14,106 INFO L87 Difference]: Start difference. First operand 1250 states and 3508 transitions. Second operand has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 6 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) [2021-05-21 20:30:14,202 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-21 20:30:14,202 INFO L93 Difference]: Finished difference Result 1426 states and 3852 transitions. [2021-05-21 20:30:14,202 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-21 20:30:14,202 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 6 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) Word has length 20 [2021-05-21 20:30:14,203 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-21 20:30:14,207 INFO L225 Difference]: With dead ends: 1426 [2021-05-21 20:30:14,207 INFO L226 Difference]: Without dead ends: 1426 [2021-05-21 20:30:14,207 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 18 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 54.3ms TimeCoverageRelationStatistics Valid=36, Invalid=54, Unknown=0, NotChecked=0, Total=90 [2021-05-21 20:30:14,208 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1426 states. [2021-05-21 20:30:14,223 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1426 to 1193. [2021-05-21 20:30:14,224 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1193 states, 1192 states have (on average 2.8003355704697985) internal successors, (3338), 1192 states have internal predecessors, (3338), 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) [2021-05-21 20:30:14,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1193 states to 1193 states and 3338 transitions. [2021-05-21 20:30:14,227 INFO L78 Accepts]: Start accepts. Automaton has 1193 states and 3338 transitions. Word has length 20 [2021-05-21 20:30:14,227 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-21 20:30:14,227 INFO L482 AbstractCegarLoop]: Abstraction has 1193 states and 3338 transitions. [2021-05-21 20:30:14,227 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 6 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) [2021-05-21 20:30:14,227 INFO L276 IsEmpty]: Start isEmpty. Operand 1193 states and 3338 transitions. [2021-05-21 20:30:14,229 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-21 20:30:14,229 INFO L513 BasicCegarLoop]: Found error trace [2021-05-21 20:30:14,229 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-21 20:30:14,443 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-21 20:30:14,443 INFO L430 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-21 20:30:14,443 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-21 20:30:14,444 INFO L82 PathProgramCache]: Analyzing trace with hash 1313790136, now seen corresponding path program 14 times [2021-05-21 20:30:14,444 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-21 20:30:14,444 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1544919199] [2021-05-21 20:30:14,444 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-21 20:30:14,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 20:30:14,468 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-21 20:30:14,468 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-21 20:30:14,468 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1544919199] [2021-05-21 20:30:14,468 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1544919199] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:14,469 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [956957929] [2021-05-21 20:30:14,469 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 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-21 20:30:14,509 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-21 20:30:14,510 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-21 20:30:14,511 INFO L263 TraceCheckSpWp]: Trace formula consists of 47 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-21 20:30:14,513 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-21 20:30:14,560 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-21 20:30:14,561 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [956957929] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:14,561 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-21 20:30:14,561 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 5 [2021-05-21 20:30:14,561 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [766498292] [2021-05-21 20:30:14,561 INFO L462 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-21 20:30:14,561 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-21 20:30:14,561 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-21 20:30:14,561 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-21 20:30:14,561 INFO L87 Difference]: Start difference. First operand 1193 states and 3338 transitions. Second operand has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 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) [2021-05-21 20:30:14,623 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-21 20:30:14,624 INFO L93 Difference]: Finished difference Result 1396 states and 3748 transitions. [2021-05-21 20:30:14,624 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-21 20:30:14,624 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 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 20 [2021-05-21 20:30:14,624 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-21 20:30:14,628 INFO L225 Difference]: With dead ends: 1396 [2021-05-21 20:30:14,628 INFO L226 Difference]: Without dead ends: 1382 [2021-05-21 20:30:14,628 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 29.4ms TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-05-21 20:30:14,629 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1382 states. [2021-05-21 20:30:14,642 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1382 to 1217. [2021-05-21 20:30:14,644 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1217 states, 1216 states have (on average 2.7779605263157894) internal successors, (3378), 1216 states have internal predecessors, (3378), 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) [2021-05-21 20:30:14,647 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1217 states to 1217 states and 3378 transitions. [2021-05-21 20:30:14,647 INFO L78 Accepts]: Start accepts. Automaton has 1217 states and 3378 transitions. Word has length 20 [2021-05-21 20:30:14,647 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-21 20:30:14,647 INFO L482 AbstractCegarLoop]: Abstraction has 1217 states and 3378 transitions. [2021-05-21 20:30:14,647 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 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) [2021-05-21 20:30:14,647 INFO L276 IsEmpty]: Start isEmpty. Operand 1217 states and 3378 transitions. [2021-05-21 20:30:14,649 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-21 20:30:14,649 INFO L513 BasicCegarLoop]: Found error trace [2021-05-21 20:30:14,649 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-21 20:30:14,865 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2021-05-21 20:30:14,865 INFO L430 AbstractCegarLoop]: === Iteration 23 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-21 20:30:14,865 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-21 20:30:14,866 INFO L82 PathProgramCache]: Analyzing trace with hash -1149983723, now seen corresponding path program 1 times [2021-05-21 20:30:14,866 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-21 20:30:14,866 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1331591327] [2021-05-21 20:30:14,866 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-21 20:30:14,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 20:30:14,897 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-21 20:30:14,898 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-21 20:30:14,898 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1331591327] [2021-05-21 20:30:14,898 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1331591327] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:14,898 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [228969549] [2021-05-21 20:30:14,898 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-21 20:30:14,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 20:30:14,930 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-21 20:30:14,930 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-21 20:30:14,986 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-21 20:30:14,986 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [228969549] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:14,986 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-21 20:30:14,986 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 10 [2021-05-21 20:30:14,986 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [346794990] [2021-05-21 20:30:14,986 INFO L462 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-21 20:30:14,986 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-21 20:30:14,987 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-21 20:30:14,987 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-05-21 20:30:14,987 INFO L87 Difference]: Start difference. First operand 1217 states and 3378 transitions. Second operand has 11 states, 11 states have (on average 3.5454545454545454) internal successors, (39), 10 states have internal predecessors, (39), 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) [2021-05-21 20:30:15,257 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-21 20:30:15,258 INFO L93 Difference]: Finished difference Result 1620 states and 4189 transitions. [2021-05-21 20:30:15,258 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-21 20:30:15,258 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 3.5454545454545454) internal successors, (39), 10 states have internal predecessors, (39), 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 [2021-05-21 20:30:15,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-21 20:30:15,262 INFO L225 Difference]: With dead ends: 1620 [2021-05-21 20:30:15,262 INFO L226 Difference]: Without dead ends: 1620 [2021-05-21 20:30:15,263 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 107 ImplicationChecksByTransitivity, 158.7ms TimeCoverageRelationStatistics Valid=106, Invalid=400, Unknown=0, NotChecked=0, Total=506 [2021-05-21 20:30:15,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1620 states. [2021-05-21 20:30:15,278 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1620 to 1363. [2021-05-21 20:30:15,280 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1363 states, 1362 states have (on average 2.6908957415565347) internal successors, (3665), 1362 states have internal predecessors, (3665), 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) [2021-05-21 20:30:15,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1363 states to 1363 states and 3665 transitions. [2021-05-21 20:30:15,282 INFO L78 Accepts]: Start accepts. Automaton has 1363 states and 3665 transitions. Word has length 23 [2021-05-21 20:30:15,282 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-21 20:30:15,282 INFO L482 AbstractCegarLoop]: Abstraction has 1363 states and 3665 transitions. [2021-05-21 20:30:15,282 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 3.5454545454545454) internal successors, (39), 10 states have internal predecessors, (39), 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) [2021-05-21 20:30:15,282 INFO L276 IsEmpty]: Start isEmpty. Operand 1363 states and 3665 transitions. [2021-05-21 20:30:15,284 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-21 20:30:15,284 INFO L513 BasicCegarLoop]: Found error trace [2021-05-21 20:30:15,284 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-21 20:30:15,499 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35,17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-21 20:30:15,499 INFO L430 AbstractCegarLoop]: === Iteration 24 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-21 20:30:15,500 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-21 20:30:15,500 INFO L82 PathProgramCache]: Analyzing trace with hash -1870263307, now seen corresponding path program 15 times [2021-05-21 20:30:15,500 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-21 20:30:15,500 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [230867951] [2021-05-21 20:30:15,500 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-21 20:30:15,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 20:30:15,528 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-21 20:30:15,528 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-21 20:30:15,529 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [230867951] [2021-05-21 20:30:15,529 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [230867951] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:15,529 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [481244201] [2021-05-21 20:30:15,529 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 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-21 20:30:15,550 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-21 20:30:15,550 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-21 20:30:15,550 INFO L263 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-21 20:30:15,551 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-21 20:30:15,593 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-21 20:30:15,593 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [481244201] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:15,593 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-21 20:30:15,593 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 4 [2021-05-21 20:30:15,593 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [702730258] [2021-05-21 20:30:15,593 INFO L462 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-21 20:30:15,593 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-21 20:30:15,593 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-21 20:30:15,594 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-21 20:30:15,594 INFO L87 Difference]: Start difference. First operand 1363 states and 3665 transitions. Second operand has 5 states, 5 states have (on average 4.6) internal successors, (23), 4 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) [2021-05-21 20:30:15,650 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-21 20:30:15,651 INFO L93 Difference]: Finished difference Result 1903 states and 5027 transitions. [2021-05-21 20:30:15,651 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-21 20:30:15,651 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.6) internal successors, (23), 4 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 [2021-05-21 20:30:15,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-21 20:30:15,656 INFO L225 Difference]: With dead ends: 1903 [2021-05-21 20:30:15,656 INFO L226 Difference]: Without dead ends: 1896 [2021-05-21 20:30:15,656 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 23 SyntacticMatches, 2 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 17.0ms TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-21 20:30:15,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1896 states. [2021-05-21 20:30:15,676 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1896 to 1797. [2021-05-21 20:30:15,678 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1797 states, 1796 states have (on average 2.693207126948775) internal successors, (4837), 1796 states have internal predecessors, (4837), 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) [2021-05-21 20:30:15,681 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1797 states to 1797 states and 4837 transitions. [2021-05-21 20:30:15,681 INFO L78 Accepts]: Start accepts. Automaton has 1797 states and 4837 transitions. Word has length 23 [2021-05-21 20:30:15,681 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-21 20:30:15,681 INFO L482 AbstractCegarLoop]: Abstraction has 1797 states and 4837 transitions. [2021-05-21 20:30:15,682 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 4.6) internal successors, (23), 4 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) [2021-05-21 20:30:15,682 INFO L276 IsEmpty]: Start isEmpty. Operand 1797 states and 4837 transitions. [2021-05-21 20:30:15,702 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-21 20:30:15,702 INFO L513 BasicCegarLoop]: Found error trace [2021-05-21 20:30:15,702 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-21 20:30:15,916 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-05-21 20:30:15,917 INFO L430 AbstractCegarLoop]: === Iteration 25 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-21 20:30:15,917 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-21 20:30:15,917 INFO L82 PathProgramCache]: Analyzing trace with hash -877014541, now seen corresponding path program 16 times [2021-05-21 20:30:15,917 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-21 20:30:15,917 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1935996905] [2021-05-21 20:30:15,917 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-21 20:30:15,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 20:30:15,945 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-21 20:30:15,945 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-21 20:30:15,945 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1935996905] [2021-05-21 20:30:15,945 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1935996905] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:15,945 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1188657456] [2021-05-21 20:30:15,945 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 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-21 20:30:15,974 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-21 20:30:15,975 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-21 20:30:15,975 INFO L263 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-21 20:30:15,975 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-21 20:30:16,007 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-21 20:30:16,008 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1188657456] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:16,008 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-21 20:30:16,008 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 4 [2021-05-21 20:30:16,008 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1417496587] [2021-05-21 20:30:16,008 INFO L462 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-21 20:30:16,008 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-21 20:30:16,008 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-21 20:30:16,008 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-21 20:30:16,009 INFO L87 Difference]: Start difference. First operand 1797 states and 4837 transitions. Second operand has 5 states, 5 states have (on average 4.4) internal successors, (22), 4 states have internal predecessors, (22), 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) [2021-05-21 20:30:16,066 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-21 20:30:16,066 INFO L93 Difference]: Finished difference Result 2099 states and 5565 transitions. [2021-05-21 20:30:16,066 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-21 20:30:16,066 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.4) internal successors, (22), 4 states have internal predecessors, (22), 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 [2021-05-21 20:30:16,066 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-21 20:30:16,082 INFO L225 Difference]: With dead ends: 2099 [2021-05-21 20:30:16,083 INFO L226 Difference]: Without dead ends: 2092 [2021-05-21 20:30:16,083 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 23 SyntacticMatches, 2 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 13.2ms TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-21 20:30:16,085 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2092 states. [2021-05-21 20:30:16,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2092 to 1863. [2021-05-21 20:30:16,109 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1863 states, 1862 states have (on average 2.700859291084855) internal successors, (5029), 1862 states have internal predecessors, (5029), 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) [2021-05-21 20:30:16,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1863 states to 1863 states and 5029 transitions. [2021-05-21 20:30:16,113 INFO L78 Accepts]: Start accepts. Automaton has 1863 states and 5029 transitions. Word has length 23 [2021-05-21 20:30:16,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-21 20:30:16,113 INFO L482 AbstractCegarLoop]: Abstraction has 1863 states and 5029 transitions. [2021-05-21 20:30:16,113 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 4.4) internal successors, (22), 4 states have internal predecessors, (22), 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) [2021-05-21 20:30:16,113 INFO L276 IsEmpty]: Start isEmpty. Operand 1863 states and 5029 transitions. [2021-05-21 20:30:16,115 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-21 20:30:16,115 INFO L513 BasicCegarLoop]: Found error trace [2021-05-21 20:30:16,115 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-21 20:30:16,328 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2021-05-21 20:30:16,329 INFO L430 AbstractCegarLoop]: === Iteration 26 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-21 20:30:16,329 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-21 20:30:16,329 INFO L82 PathProgramCache]: Analyzing trace with hash 1516662741, now seen corresponding path program 1 times [2021-05-21 20:30:16,329 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-21 20:30:16,329 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1811950619] [2021-05-21 20:30:16,329 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-21 20:30:16,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 20:30:16,368 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 5 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-21 20:30:16,368 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-21 20:30:16,368 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1811950619] [2021-05-21 20:30:16,368 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1811950619] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:16,368 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1096211919] [2021-05-21 20:30:16,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-21 20:30:16,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 20:30:16,394 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-21 20:30:16,394 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-21 20:30:16,461 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-21 20:30:16,461 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1096211919] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:16,461 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-21 20:30:16,461 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 9 [2021-05-21 20:30:16,461 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [239003694] [2021-05-21 20:30:16,461 INFO L462 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-21 20:30:16,461 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-21 20:30:16,462 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-21 20:30:16,462 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-05-21 20:30:16,462 INFO L87 Difference]: Start difference. First operand 1863 states and 5029 transitions. Second operand has 10 states, 10 states have (on average 3.9) internal successors, (39), 9 states have internal predecessors, (39), 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) [2021-05-21 20:30:16,581 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-21 20:30:16,581 INFO L93 Difference]: Finished difference Result 1530 states and 4049 transitions. [2021-05-21 20:30:16,581 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-21 20:30:16,581 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.9) internal successors, (39), 9 states have internal predecessors, (39), 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 [2021-05-21 20:30:16,581 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-21 20:30:16,584 INFO L225 Difference]: With dead ends: 1530 [2021-05-21 20:30:16,584 INFO L226 Difference]: Without dead ends: 1391 [2021-05-21 20:30:16,584 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 70.8ms TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2021-05-21 20:30:16,585 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1391 states. [2021-05-21 20:30:16,598 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1391 to 1357. [2021-05-21 20:30:16,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1357 states, 1356 states have (on average 2.7109144542772863) internal successors, (3676), 1356 states have internal predecessors, (3676), 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) [2021-05-21 20:30:16,611 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1357 states to 1357 states and 3676 transitions. [2021-05-21 20:30:16,611 INFO L78 Accepts]: Start accepts. Automaton has 1357 states and 3676 transitions. Word has length 23 [2021-05-21 20:30:16,611 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-21 20:30:16,611 INFO L482 AbstractCegarLoop]: Abstraction has 1357 states and 3676 transitions. [2021-05-21 20:30:16,612 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.9) internal successors, (39), 9 states have internal predecessors, (39), 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) [2021-05-21 20:30:16,612 INFO L276 IsEmpty]: Start isEmpty. Operand 1357 states and 3676 transitions. [2021-05-21 20:30:16,613 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-21 20:30:16,613 INFO L513 BasicCegarLoop]: Found error trace [2021-05-21 20:30:16,613 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-21 20:30:16,820 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-05-21 20:30:16,821 INFO L430 AbstractCegarLoop]: === Iteration 27 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-21 20:30:16,821 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-21 20:30:16,821 INFO L82 PathProgramCache]: Analyzing trace with hash 2072587809, now seen corresponding path program 2 times [2021-05-21 20:30:16,821 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-21 20:30:16,821 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [776149792] [2021-05-21 20:30:16,821 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-21 20:30:16,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 20:30:16,860 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-21 20:30:16,861 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-21 20:30:16,861 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [776149792] [2021-05-21 20:30:16,861 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [776149792] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:16,861 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [84218593] [2021-05-21 20:30:16,861 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 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-21 20:30:16,926 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-21 20:30:16,926 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-21 20:30:16,926 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-21 20:30:16,927 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-21 20:30:16,978 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-21 20:30:16,978 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [84218593] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:16,978 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-21 20:30:16,978 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 9 [2021-05-21 20:30:16,978 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [939142207] [2021-05-21 20:30:16,978 INFO L462 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-21 20:30:16,979 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-21 20:30:16,979 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-21 20:30:16,979 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-05-21 20:30:16,979 INFO L87 Difference]: Start difference. First operand 1357 states and 3676 transitions. Second operand has 10 states, 10 states have (on average 3.6) internal successors, (36), 9 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) [2021-05-21 20:30:17,103 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-21 20:30:17,103 INFO L93 Difference]: Finished difference Result 1538 states and 4021 transitions. [2021-05-21 20:30:17,103 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-21 20:30:17,103 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.6) internal successors, (36), 9 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 23 [2021-05-21 20:30:17,103 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-21 20:30:17,106 INFO L225 Difference]: With dead ends: 1538 [2021-05-21 20:30:17,106 INFO L226 Difference]: Without dead ends: 1538 [2021-05-21 20:30:17,106 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 79.3ms TimeCoverageRelationStatistics Valid=47, Invalid=135, Unknown=0, NotChecked=0, Total=182 [2021-05-21 20:30:17,107 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1538 states. [2021-05-21 20:30:17,122 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1538 to 1383. [2021-05-21 20:30:17,124 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1383 states, 1382 states have (on average 2.703328509406657) internal successors, (3736), 1382 states have internal predecessors, (3736), 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) [2021-05-21 20:30:17,126 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1383 states to 1383 states and 3736 transitions. [2021-05-21 20:30:17,126 INFO L78 Accepts]: Start accepts. Automaton has 1383 states and 3736 transitions. Word has length 23 [2021-05-21 20:30:17,126 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-21 20:30:17,126 INFO L482 AbstractCegarLoop]: Abstraction has 1383 states and 3736 transitions. [2021-05-21 20:30:17,126 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.6) internal successors, (36), 9 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) [2021-05-21 20:30:17,126 INFO L276 IsEmpty]: Start isEmpty. Operand 1383 states and 3736 transitions. [2021-05-21 20:30:17,128 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-21 20:30:17,128 INFO L513 BasicCegarLoop]: Found error trace [2021-05-21 20:30:17,128 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-21 20:30:17,344 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2021-05-21 20:30:17,344 INFO L430 AbstractCegarLoop]: === Iteration 28 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-21 20:30:17,344 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-21 20:30:17,344 INFO L82 PathProgramCache]: Analyzing trace with hash 1575503784, now seen corresponding path program 2 times [2021-05-21 20:30:17,344 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-21 20:30:17,344 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [323456400] [2021-05-21 20:30:17,344 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-21 20:30:17,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 20:30:17,376 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 8 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-21 20:30:17,376 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-21 20:30:17,376 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [323456400] [2021-05-21 20:30:17,376 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [323456400] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:17,376 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [570556035] [2021-05-21 20:30:17,376 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 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-21 20:30:17,397 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-21 20:30:17,397 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-21 20:30:17,397 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 8 conjunts are in the unsatisfiable core [2021-05-21 20:30:17,398 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-21 20:30:17,439 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 8 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-21 20:30:17,439 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [570556035] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:17,439 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-21 20:30:17,439 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 7 [2021-05-21 20:30:17,439 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [304082975] [2021-05-21 20:30:17,439 INFO L462 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-21 20:30:17,439 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-21 20:30:17,440 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-21 20:30:17,440 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2021-05-21 20:30:17,440 INFO L87 Difference]: Start difference. First operand 1383 states and 3736 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) [2021-05-21 20:30:17,507 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-21 20:30:17,507 INFO L93 Difference]: Finished difference Result 1546 states and 4028 transitions. [2021-05-21 20:30:17,507 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-21 20:30:17,507 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 23 [2021-05-21 20:30:17,507 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-21 20:30:17,509 INFO L225 Difference]: With dead ends: 1546 [2021-05-21 20:30:17,509 INFO L226 Difference]: Without dead ends: 1526 [2021-05-21 20:30:17,509 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 40.4ms TimeCoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2021-05-21 20:30:17,511 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1526 states. [2021-05-21 20:30:17,530 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1526 to 1395. [2021-05-21 20:30:17,531 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1395 states, 1394 states have (on average 2.6886657101865135) internal successors, (3748), 1394 states have internal predecessors, (3748), 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) [2021-05-21 20:30:17,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1395 states to 1395 states and 3748 transitions. [2021-05-21 20:30:17,534 INFO L78 Accepts]: Start accepts. Automaton has 1395 states and 3748 transitions. Word has length 23 [2021-05-21 20:30:17,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-21 20:30:17,534 INFO L482 AbstractCegarLoop]: Abstraction has 1395 states and 3748 transitions. [2021-05-21 20:30:17,534 INFO L483 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) [2021-05-21 20:30:17,534 INFO L276 IsEmpty]: Start isEmpty. Operand 1395 states and 3748 transitions. [2021-05-21 20:30:17,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-21 20:30:17,535 INFO L513 BasicCegarLoop]: Found error trace [2021-05-21 20:30:17,535 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-21 20:30:17,748 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,22 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-21 20:30:17,749 INFO L430 AbstractCegarLoop]: === Iteration 29 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-21 20:30:17,749 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-21 20:30:17,749 INFO L82 PathProgramCache]: Analyzing trace with hash -1556804075, now seen corresponding path program 3 times [2021-05-21 20:30:17,749 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-21 20:30:17,749 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1396753874] [2021-05-21 20:30:17,749 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-21 20:30:17,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 20:30:17,787 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-21 20:30:17,787 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-21 20:30:17,787 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1396753874] [2021-05-21 20:30:17,788 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1396753874] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:17,788 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1938724761] [2021-05-21 20:30:17,788 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 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-21 20:30:17,816 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-21 20:30:17,817 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-21 20:30:17,817 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-21 20:30:17,817 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-21 20:30:17,866 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-21 20:30:17,866 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1938724761] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:17,866 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-21 20:30:17,866 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 9 [2021-05-21 20:30:17,866 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1545364550] [2021-05-21 20:30:17,867 INFO L462 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-21 20:30:17,867 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-21 20:30:17,867 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-21 20:30:17,867 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-05-21 20:30:17,867 INFO L87 Difference]: Start difference. First operand 1395 states and 3748 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) [2021-05-21 20:30:18,004 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-21 20:30:18,004 INFO L93 Difference]: Finished difference Result 1913 states and 4928 transitions. [2021-05-21 20:30:18,004 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-21 20:30:18,004 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 23 [2021-05-21 20:30:18,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-21 20:30:18,007 INFO L225 Difference]: With dead ends: 1913 [2021-05-21 20:30:18,007 INFO L226 Difference]: Without dead ends: 1913 [2021-05-21 20:30:18,007 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 63.1ms TimeCoverageRelationStatistics Valid=47, Invalid=135, Unknown=0, NotChecked=0, Total=182 [2021-05-21 20:30:18,009 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1913 states. [2021-05-21 20:30:18,024 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1913 to 1544. [2021-05-21 20:30:18,025 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1544 states, 1543 states have (on average 2.6824368114063515) internal successors, (4139), 1543 states have internal predecessors, (4139), 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) [2021-05-21 20:30:18,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1544 states to 1544 states and 4139 transitions. [2021-05-21 20:30:18,027 INFO L78 Accepts]: Start accepts. Automaton has 1544 states and 4139 transitions. Word has length 23 [2021-05-21 20:30:18,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-21 20:30:18,028 INFO L482 AbstractCegarLoop]: Abstraction has 1544 states and 4139 transitions. [2021-05-21 20:30:18,028 INFO L483 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) [2021-05-21 20:30:18,028 INFO L276 IsEmpty]: Start isEmpty. Operand 1544 states and 4139 transitions. [2021-05-21 20:30:18,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-21 20:30:18,029 INFO L513 BasicCegarLoop]: Found error trace [2021-05-21 20:30:18,029 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-21 20:30:18,244 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-21 20:30:18,245 INFO L430 AbstractCegarLoop]: === Iteration 30 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-21 20:30:18,245 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-21 20:30:18,245 INFO L82 PathProgramCache]: Analyzing trace with hash -56471083, now seen corresponding path program 3 times [2021-05-21 20:30:18,245 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-21 20:30:18,245 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1455506400] [2021-05-21 20:30:18,245 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-21 20:30:18,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 20:30:18,280 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-21 20:30:18,280 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-21 20:30:18,280 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1455506400] [2021-05-21 20:30:18,281 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1455506400] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-21 20:30:18,281 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-21 20:30:18,281 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-21 20:30:18,281 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [100510963] [2021-05-21 20:30:18,281 INFO L462 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-21 20:30:18,281 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-21 20:30:18,281 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-21 20:30:18,281 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-21 20:30:18,281 INFO L87 Difference]: Start difference. First operand 1544 states and 4139 transitions. Second operand has 5 states, 5 states have (on average 4.4) internal successors, (22), 4 states have internal predecessors, (22), 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) [2021-05-21 20:30:18,321 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-21 20:30:18,321 INFO L93 Difference]: Finished difference Result 1492 states and 3879 transitions. [2021-05-21 20:30:18,321 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-21 20:30:18,322 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.4) internal successors, (22), 4 states have internal predecessors, (22), 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 [2021-05-21 20:30:18,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-21 20:30:18,324 INFO L225 Difference]: With dead ends: 1492 [2021-05-21 20:30:18,324 INFO L226 Difference]: Without dead ends: 1411 [2021-05-21 20:30:18,324 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 2 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 20.6ms TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-21 20:30:18,325 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1411 states. [2021-05-21 20:30:18,338 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1411 to 1381. [2021-05-21 20:30:18,339 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1381 states, 1380 states have (on average 2.6231884057971016) internal successors, (3620), 1380 states have internal predecessors, (3620), 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) [2021-05-21 20:30:18,341 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1381 states to 1381 states and 3620 transitions. [2021-05-21 20:30:18,341 INFO L78 Accepts]: Start accepts. Automaton has 1381 states and 3620 transitions. Word has length 23 [2021-05-21 20:30:18,341 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-21 20:30:18,341 INFO L482 AbstractCegarLoop]: Abstraction has 1381 states and 3620 transitions. [2021-05-21 20:30:18,341 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 4.4) internal successors, (22), 4 states have internal predecessors, (22), 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) [2021-05-21 20:30:18,341 INFO L276 IsEmpty]: Start isEmpty. Operand 1381 states and 3620 transitions. [2021-05-21 20:30:18,342 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-21 20:30:18,342 INFO L513 BasicCegarLoop]: Found error trace [2021-05-21 20:30:18,343 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-21 20:30:18,343 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2021-05-21 20:30:18,343 INFO L430 AbstractCegarLoop]: === Iteration 31 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-21 20:30:18,343 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-21 20:30:18,343 INFO L82 PathProgramCache]: Analyzing trace with hash -670007263, now seen corresponding path program 4 times [2021-05-21 20:30:18,343 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-21 20:30:18,343 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [886111127] [2021-05-21 20:30:18,343 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-21 20:30:18,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 20:30:18,378 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-21 20:30:18,379 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-21 20:30:18,379 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [886111127] [2021-05-21 20:30:18,379 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [886111127] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:18,379 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1604081869] [2021-05-21 20:30:18,379 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 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-21 20:30:18,407 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-21 20:30:18,407 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-21 20:30:18,407 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-21 20:30:18,408 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-21 20:30:18,454 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-21 20:30:18,454 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1604081869] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:18,454 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-21 20:30:18,454 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 9 [2021-05-21 20:30:18,454 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [432705904] [2021-05-21 20:30:18,455 INFO L462 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-21 20:30:18,455 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-21 20:30:18,455 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-21 20:30:18,455 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-05-21 20:30:18,455 INFO L87 Difference]: Start difference. First operand 1381 states and 3620 transitions. Second operand has 10 states, 10 states have (on average 3.5) internal successors, (35), 9 states have internal predecessors, (35), 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) [2021-05-21 20:30:18,626 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-21 20:30:18,626 INFO L93 Difference]: Finished difference Result 1624 states and 4116 transitions. [2021-05-21 20:30:18,626 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-21 20:30:18,626 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.5) internal successors, (35), 9 states have internal predecessors, (35), 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 [2021-05-21 20:30:18,626 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-21 20:30:18,629 INFO L225 Difference]: With dead ends: 1624 [2021-05-21 20:30:18,629 INFO L226 Difference]: Without dead ends: 1612 [2021-05-21 20:30:18,629 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 90.4ms TimeCoverageRelationStatistics Valid=52, Invalid=158, Unknown=0, NotChecked=0, Total=210 [2021-05-21 20:30:18,630 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1612 states. [2021-05-21 20:30:18,643 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1612 to 1413. [2021-05-21 20:30:18,644 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1413 states, 1412 states have (on average 2.6203966005665724) internal successors, (3700), 1412 states have internal predecessors, (3700), 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) [2021-05-21 20:30:18,646 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1413 states to 1413 states and 3700 transitions. [2021-05-21 20:30:18,646 INFO L78 Accepts]: Start accepts. Automaton has 1413 states and 3700 transitions. Word has length 23 [2021-05-21 20:30:18,646 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-21 20:30:18,646 INFO L482 AbstractCegarLoop]: Abstraction has 1413 states and 3700 transitions. [2021-05-21 20:30:18,646 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.5) internal successors, (35), 9 states have internal predecessors, (35), 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) [2021-05-21 20:30:18,647 INFO L276 IsEmpty]: Start isEmpty. Operand 1413 states and 3700 transitions. [2021-05-21 20:30:18,648 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-21 20:30:18,648 INFO L513 BasicCegarLoop]: Found error trace [2021-05-21 20:30:18,648 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-21 20:30:18,873 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable46 [2021-05-21 20:30:18,874 INFO L430 AbstractCegarLoop]: === Iteration 32 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-21 20:30:18,874 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-21 20:30:18,874 INFO L82 PathProgramCache]: Analyzing trace with hash -819089257, now seen corresponding path program 17 times [2021-05-21 20:30:18,874 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-21 20:30:18,874 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1001150679] [2021-05-21 20:30:18,874 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-21 20:30:18,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 20:30:18,897 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-21 20:30:18,897 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-21 20:30:18,897 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1001150679] [2021-05-21 20:30:18,897 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1001150679] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:18,897 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1338385606] [2021-05-21 20:30:18,897 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 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-21 20:30:18,919 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-05-21 20:30:18,919 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-21 20:30:18,919 INFO L263 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-21 20:30:18,920 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-21 20:30:19,017 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 7 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-21 20:30:19,018 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1338385606] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:19,018 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-21 20:30:19,018 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 9] total 11 [2021-05-21 20:30:19,018 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2121599470] [2021-05-21 20:30:19,018 INFO L462 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-21 20:30:19,018 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-21 20:30:19,018 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-21 20:30:19,018 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=92, Unknown=0, NotChecked=0, Total=132 [2021-05-21 20:30:19,019 INFO L87 Difference]: Start difference. First operand 1413 states and 3700 transitions. Second operand has 12 states, 12 states have (on average 3.25) internal successors, (39), 11 states have internal predecessors, (39), 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) [2021-05-21 20:30:19,420 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-21 20:30:19,420 INFO L93 Difference]: Finished difference Result 2940 states and 7390 transitions. [2021-05-21 20:30:19,421 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-21 20:30:19,421 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.25) internal successors, (39), 11 states have internal predecessors, (39), 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 [2021-05-21 20:30:19,421 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-21 20:30:19,425 INFO L225 Difference]: With dead ends: 2940 [2021-05-21 20:30:19,425 INFO L226 Difference]: Without dead ends: 2926 [2021-05-21 20:30:19,425 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 94 ImplicationChecksByTransitivity, 220.4ms TimeCoverageRelationStatistics Valid=161, Invalid=439, Unknown=0, NotChecked=0, Total=600 [2021-05-21 20:30:19,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2926 states. [2021-05-21 20:30:19,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2926 to 1583. [2021-05-21 20:30:19,447 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1583 states, 1582 states have (on average 2.618204804045512) internal successors, (4142), 1582 states have internal predecessors, (4142), 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) [2021-05-21 20:30:19,450 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1583 states to 1583 states and 4142 transitions. [2021-05-21 20:30:19,450 INFO L78 Accepts]: Start accepts. Automaton has 1583 states and 4142 transitions. Word has length 23 [2021-05-21 20:30:19,450 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-21 20:30:19,450 INFO L482 AbstractCegarLoop]: Abstraction has 1583 states and 4142 transitions. [2021-05-21 20:30:19,450 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 3.25) internal successors, (39), 11 states have internal predecessors, (39), 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) [2021-05-21 20:30:19,450 INFO L276 IsEmpty]: Start isEmpty. Operand 1583 states and 4142 transitions. [2021-05-21 20:30:19,451 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-21 20:30:19,451 INFO L513 BasicCegarLoop]: Found error trace [2021-05-21 20:30:19,451 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-21 20:30:19,657 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47,25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-21 20:30:19,658 INFO L430 AbstractCegarLoop]: === Iteration 33 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-21 20:30:19,658 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-21 20:30:19,658 INFO L82 PathProgramCache]: Analyzing trace with hash 1471910071, now seen corresponding path program 5 times [2021-05-21 20:30:19,658 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-21 20:30:19,658 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [320074493] [2021-05-21 20:30:19,658 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-21 20:30:19,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 20:30:19,689 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-21 20:30:19,689 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-21 20:30:19,689 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [320074493] [2021-05-21 20:30:19,689 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [320074493] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:19,689 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [712497099] [2021-05-21 20:30:19,690 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 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-21 20:30:19,710 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-05-21 20:30:19,710 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-21 20:30:19,710 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-21 20:30:19,711 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-21 20:30:19,773 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-21 20:30:19,773 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [712497099] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:19,773 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-21 20:30:19,773 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 10 [2021-05-21 20:30:19,773 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [436389539] [2021-05-21 20:30:19,774 INFO L462 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-21 20:30:19,774 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-21 20:30:19,774 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-21 20:30:19,774 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-05-21 20:30:19,774 INFO L87 Difference]: Start difference. First operand 1583 states and 4142 transitions. Second operand has 11 states, 11 states have (on average 3.3636363636363638) internal successors, (37), 10 states have internal predecessors, (37), 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) [2021-05-21 20:30:20,020 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-21 20:30:20,020 INFO L93 Difference]: Finished difference Result 1758 states and 4409 transitions. [2021-05-21 20:30:20,021 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-21 20:30:20,021 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 3.3636363636363638) internal successors, (37), 10 states have internal predecessors, (37), 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 [2021-05-21 20:30:20,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-21 20:30:20,024 INFO L225 Difference]: With dead ends: 1758 [2021-05-21 20:30:20,024 INFO L226 Difference]: Without dead ends: 1746 [2021-05-21 20:30:20,024 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 103 ImplicationChecksByTransitivity, 144.9ms TimeCoverageRelationStatistics Valid=106, Invalid=400, Unknown=0, NotChecked=0, Total=506 [2021-05-21 20:30:20,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1746 states. [2021-05-21 20:30:20,037 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1746 to 1437. [2021-05-21 20:30:20,038 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1437 states, 1436 states have (on average 2.597493036211699) internal successors, (3730), 1436 states have internal predecessors, (3730), 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) [2021-05-21 20:30:20,040 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1437 states to 1437 states and 3730 transitions. [2021-05-21 20:30:20,040 INFO L78 Accepts]: Start accepts. Automaton has 1437 states and 3730 transitions. Word has length 23 [2021-05-21 20:30:20,040 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-21 20:30:20,040 INFO L482 AbstractCegarLoop]: Abstraction has 1437 states and 3730 transitions. [2021-05-21 20:30:20,040 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 3.3636363636363638) internal successors, (37), 10 states have internal predecessors, (37), 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) [2021-05-21 20:30:20,040 INFO L276 IsEmpty]: Start isEmpty. Operand 1437 states and 3730 transitions. [2021-05-21 20:30:20,041 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-21 20:30:20,041 INFO L513 BasicCegarLoop]: Found error trace [2021-05-21 20:30:20,041 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-21 20:30:20,256 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable50 [2021-05-21 20:30:20,257 INFO L430 AbstractCegarLoop]: === Iteration 34 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-21 20:30:20,257 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-21 20:30:20,257 INFO L82 PathProgramCache]: Analyzing trace with hash -1618050889, now seen corresponding path program 4 times [2021-05-21 20:30:20,257 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-21 20:30:20,257 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [285525143] [2021-05-21 20:30:20,257 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-21 20:30:20,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 20:30:20,294 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 7 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-21 20:30:20,295 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-21 20:30:20,295 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [285525143] [2021-05-21 20:30:20,295 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [285525143] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:20,295 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [624493956] [2021-05-21 20:30:20,295 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 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-21 20:30:20,315 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-21 20:30:20,316 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-21 20:30:20,316 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-21 20:30:20,316 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-21 20:30:20,362 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 5 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-21 20:30:20,362 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [624493956] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:20,362 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-21 20:30:20,362 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 9 [2021-05-21 20:30:20,362 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [412287444] [2021-05-21 20:30:20,362 INFO L462 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-21 20:30:20,362 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-21 20:30:20,363 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-21 20:30:20,363 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-05-21 20:30:20,363 INFO L87 Difference]: Start difference. First operand 1437 states and 3730 transitions. Second operand has 10 states, 10 states have (on average 3.7) internal successors, (37), 9 states have internal predecessors, (37), 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) [2021-05-21 20:30:20,461 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-21 20:30:20,461 INFO L93 Difference]: Finished difference Result 1432 states and 3672 transitions. [2021-05-21 20:30:20,461 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-21 20:30:20,461 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.7) internal successors, (37), 9 states have internal predecessors, (37), 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 [2021-05-21 20:30:20,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-21 20:30:20,464 INFO L225 Difference]: With dead ends: 1432 [2021-05-21 20:30:20,464 INFO L226 Difference]: Without dead ends: 1365 [2021-05-21 20:30:20,464 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 68.4ms TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2021-05-21 20:30:20,465 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1365 states. [2021-05-21 20:30:20,483 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1365 to 1356. [2021-05-21 20:30:20,484 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1356 states, 1355 states have (on average 2.607380073800738) internal successors, (3533), 1355 states have internal predecessors, (3533), 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) [2021-05-21 20:30:20,486 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1356 states to 1356 states and 3533 transitions. [2021-05-21 20:30:20,486 INFO L78 Accepts]: Start accepts. Automaton has 1356 states and 3533 transitions. Word has length 23 [2021-05-21 20:30:20,486 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-21 20:30:20,486 INFO L482 AbstractCegarLoop]: Abstraction has 1356 states and 3533 transitions. [2021-05-21 20:30:20,486 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.7) internal successors, (37), 9 states have internal predecessors, (37), 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) [2021-05-21 20:30:20,487 INFO L276 IsEmpty]: Start isEmpty. Operand 1356 states and 3533 transitions. [2021-05-21 20:30:20,488 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-21 20:30:20,488 INFO L513 BasicCegarLoop]: Found error trace [2021-05-21 20:30:20,488 INFO L521 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-21 20:30:20,703 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51,27 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-21 20:30:20,704 INFO L430 AbstractCegarLoop]: === Iteration 35 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-21 20:30:20,704 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-21 20:30:20,704 INFO L82 PathProgramCache]: Analyzing trace with hash 2131794949, now seen corresponding path program 18 times [2021-05-21 20:30:20,704 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-21 20:30:20,704 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [172588924] [2021-05-21 20:30:20,704 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-21 20:30:20,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 20:30:20,743 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 5 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-21 20:30:20,743 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-21 20:30:20,743 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [172588924] [2021-05-21 20:30:20,743 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [172588924] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:20,743 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1306157896] [2021-05-21 20:30:20,744 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 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-21 20:30:20,765 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2021-05-21 20:30:20,765 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-21 20:30:20,765 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-21 20:30:20,766 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-21 20:30:20,809 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 5 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-21 20:30:20,809 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1306157896] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:20,809 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-21 20:30:20,809 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 7 [2021-05-21 20:30:20,809 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1317802603] [2021-05-21 20:30:20,810 INFO L462 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-21 20:30:20,810 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-21 20:30:20,810 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-21 20:30:20,810 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-05-21 20:30:20,810 INFO L87 Difference]: Start difference. First operand 1356 states and 3533 transitions. Second operand has 8 states, 8 states have (on average 3.25) internal successors, (26), 7 states have internal predecessors, (26), 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) [2021-05-21 20:30:20,932 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-21 20:30:20,933 INFO L93 Difference]: Finished difference Result 1715 states and 4244 transitions. [2021-05-21 20:30:20,933 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-21 20:30:20,933 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.25) internal successors, (26), 7 states have internal predecessors, (26), 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 26 [2021-05-21 20:30:20,933 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-21 20:30:20,935 INFO L225 Difference]: With dead ends: 1715 [2021-05-21 20:30:20,935 INFO L226 Difference]: Without dead ends: 1715 [2021-05-21 20:30:20,935 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 65.6ms TimeCoverageRelationStatistics Valid=59, Invalid=97, Unknown=0, NotChecked=0, Total=156 [2021-05-21 20:30:20,937 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1715 states. [2021-05-21 20:30:20,948 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1715 to 1404. [2021-05-21 20:30:20,949 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1404 states, 1403 states have (on average 2.6129722024233786) internal successors, (3666), 1403 states have internal predecessors, (3666), 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) [2021-05-21 20:30:20,951 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1404 states to 1404 states and 3666 transitions. [2021-05-21 20:30:20,951 INFO L78 Accepts]: Start accepts. Automaton has 1404 states and 3666 transitions. Word has length 26 [2021-05-21 20:30:20,951 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-21 20:30:20,951 INFO L482 AbstractCegarLoop]: Abstraction has 1404 states and 3666 transitions. [2021-05-21 20:30:20,951 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 3.25) internal successors, (26), 7 states have internal predecessors, (26), 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) [2021-05-21 20:30:20,951 INFO L276 IsEmpty]: Start isEmpty. Operand 1404 states and 3666 transitions. [2021-05-21 20:30:20,952 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-21 20:30:20,952 INFO L513 BasicCegarLoop]: Found error trace [2021-05-21 20:30:20,952 INFO L521 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-21 20:30:21,168 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable52 [2021-05-21 20:30:21,168 INFO L430 AbstractCegarLoop]: === Iteration 36 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-21 20:30:21,168 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-21 20:30:21,168 INFO L82 PathProgramCache]: Analyzing trace with hash 761307032, now seen corresponding path program 19 times [2021-05-21 20:30:21,168 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-21 20:30:21,168 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1583499082] [2021-05-21 20:30:21,168 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-21 20:30:21,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 20:30:21,199 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 8 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-21 20:30:21,199 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-21 20:30:21,199 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1583499082] [2021-05-21 20:30:21,199 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1583499082] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:21,200 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [433015322] [2021-05-21 20:30:21,200 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 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-21 20:30:21,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 20:30:21,221 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-21 20:30:21,221 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-21 20:30:21,272 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 8 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-21 20:30:21,272 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [433015322] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:21,272 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-21 20:30:21,272 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 7 [2021-05-21 20:30:21,273 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1121968884] [2021-05-21 20:30:21,273 INFO L462 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-21 20:30:21,273 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-21 20:30:21,273 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-21 20:30:21,273 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2021-05-21 20:30:21,274 INFO L87 Difference]: Start difference. First operand 1404 states and 3666 transitions. Second operand has 8 states, 8 states have (on average 3.875) internal successors, (31), 7 states have internal predecessors, (31), 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) [2021-05-21 20:30:21,355 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-21 20:30:21,356 INFO L93 Difference]: Finished difference Result 2473 states and 6334 transitions. [2021-05-21 20:30:21,356 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-21 20:30:21,356 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.875) internal successors, (31), 7 states have internal predecessors, (31), 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 26 [2021-05-21 20:30:21,356 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-21 20:30:21,363 INFO L225 Difference]: With dead ends: 2473 [2021-05-21 20:30:21,363 INFO L226 Difference]: Without dead ends: 2455 [2021-05-21 20:30:21,363 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 38.8ms TimeCoverageRelationStatistics Valid=32, Invalid=58, Unknown=0, NotChecked=0, Total=90 [2021-05-21 20:30:21,365 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2455 states. [2021-05-21 20:30:21,389 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2455 to 2018. [2021-05-21 20:30:21,390 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2018 states, 2017 states have (on average 2.707982151710461) internal successors, (5462), 2017 states have internal predecessors, (5462), 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) [2021-05-21 20:30:21,394 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2018 states to 2018 states and 5462 transitions. [2021-05-21 20:30:21,394 INFO L78 Accepts]: Start accepts. Automaton has 2018 states and 5462 transitions. Word has length 26 [2021-05-21 20:30:21,394 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-21 20:30:21,394 INFO L482 AbstractCegarLoop]: Abstraction has 2018 states and 5462 transitions. [2021-05-21 20:30:21,394 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 3.875) internal successors, (31), 7 states have internal predecessors, (31), 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) [2021-05-21 20:30:21,394 INFO L276 IsEmpty]: Start isEmpty. Operand 2018 states and 5462 transitions. [2021-05-21 20:30:21,396 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-21 20:30:21,396 INFO L513 BasicCegarLoop]: Found error trace [2021-05-21 20:30:21,396 INFO L521 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-21 20:30:21,608 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53,29 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-21 20:30:21,609 INFO L430 AbstractCegarLoop]: === Iteration 37 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-21 20:30:21,609 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-21 20:30:21,609 INFO L82 PathProgramCache]: Analyzing trace with hash -195885608, now seen corresponding path program 20 times [2021-05-21 20:30:21,609 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-21 20:30:21,609 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [924446084] [2021-05-21 20:30:21,609 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-21 20:30:21,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 20:30:21,634 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-21 20:30:21,634 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-21 20:30:21,634 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [924446084] [2021-05-21 20:30:21,634 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [924446084] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:21,634 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [97718493] [2021-05-21 20:30:21,634 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 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-21 20:30:21,668 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-21 20:30:21,669 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-21 20:30:21,669 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-21 20:30:21,669 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-21 20:30:21,712 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 11 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-21 20:30:21,712 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [97718493] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:21,712 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-21 20:30:21,712 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6] total 6 [2021-05-21 20:30:21,712 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1323551396] [2021-05-21 20:30:21,713 INFO L462 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-21 20:30:21,713 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-21 20:30:21,713 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-21 20:30:21,713 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-05-21 20:30:21,714 INFO L87 Difference]: Start difference. First operand 2018 states and 5462 transitions. Second operand has 7 states, 7 states have (on average 4.428571428571429) internal successors, (31), 6 states have internal predecessors, (31), 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) [2021-05-21 20:30:21,810 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-21 20:30:21,811 INFO L93 Difference]: Finished difference Result 2447 states and 6260 transitions. [2021-05-21 20:30:21,811 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-21 20:30:21,811 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.428571428571429) internal successors, (31), 6 states have internal predecessors, (31), 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 26 [2021-05-21 20:30:21,811 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-21 20:30:21,814 INFO L225 Difference]: With dead ends: 2447 [2021-05-21 20:30:21,814 INFO L226 Difference]: Without dead ends: 2447 [2021-05-21 20:30:21,814 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 26 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 41.7ms TimeCoverageRelationStatistics Valid=34, Invalid=56, Unknown=0, NotChecked=0, Total=90 [2021-05-21 20:30:21,816 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2447 states. [2021-05-21 20:30:21,837 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2447 to 1914. [2021-05-21 20:30:21,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1914 states, 1913 states have (on average 2.6905384213277577) internal successors, (5147), 1913 states have internal predecessors, (5147), 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) [2021-05-21 20:30:21,841 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1914 states to 1914 states and 5147 transitions. [2021-05-21 20:30:21,841 INFO L78 Accepts]: Start accepts. Automaton has 1914 states and 5147 transitions. Word has length 26 [2021-05-21 20:30:21,841 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-21 20:30:21,841 INFO L482 AbstractCegarLoop]: Abstraction has 1914 states and 5147 transitions. [2021-05-21 20:30:21,841 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 4.428571428571429) internal successors, (31), 6 states have internal predecessors, (31), 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) [2021-05-21 20:30:21,841 INFO L276 IsEmpty]: Start isEmpty. Operand 1914 states and 5147 transitions. [2021-05-21 20:30:21,843 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-21 20:30:21,843 INFO L513 BasicCegarLoop]: Found error trace [2021-05-21 20:30:21,843 INFO L521 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-21 20:30:22,058 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable56 [2021-05-21 20:30:22,059 INFO L430 AbstractCegarLoop]: === Iteration 38 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-21 20:30:22,059 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-21 20:30:22,059 INFO L82 PathProgramCache]: Analyzing trace with hash -1127702055, now seen corresponding path program 21 times [2021-05-21 20:30:22,059 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-21 20:30:22,059 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1700373199] [2021-05-21 20:30:22,059 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-21 20:30:22,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 20:30:22,084 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 11 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-21 20:30:22,084 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-21 20:30:22,084 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1700373199] [2021-05-21 20:30:22,084 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1700373199] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:22,084 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1082168582] [2021-05-21 20:30:22,084 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 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-21 20:30:22,106 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-21 20:30:22,106 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-21 20:30:22,107 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-21 20:30:22,107 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-21 20:30:22,139 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 11 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-21 20:30:22,139 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1082168582] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:22,139 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-21 20:30:22,139 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 5 [2021-05-21 20:30:22,139 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [598028686] [2021-05-21 20:30:22,139 INFO L462 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-21 20:30:22,139 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-21 20:30:22,140 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-21 20:30:22,140 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-21 20:30:22,140 INFO L87 Difference]: Start difference. First operand 1914 states and 5147 transitions. Second operand has 6 states, 6 states have (on average 4.333333333333333) internal successors, (26), 5 states have internal predecessors, (26), 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) [2021-05-21 20:30:22,211 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-21 20:30:22,212 INFO L93 Difference]: Finished difference Result 2092 states and 5497 transitions. [2021-05-21 20:30:22,212 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-21 20:30:22,212 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.333333333333333) internal successors, (26), 5 states have internal predecessors, (26), 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 26 [2021-05-21 20:30:22,212 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-21 20:30:22,214 INFO L225 Difference]: With dead ends: 2092 [2021-05-21 20:30:22,214 INFO L226 Difference]: Without dead ends: 2089 [2021-05-21 20:30:22,217 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 28.1ms TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-05-21 20:30:22,219 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2089 states. [2021-05-21 20:30:22,234 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2089 to 1899. [2021-05-21 20:30:22,235 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1899 states, 1898 states have (on average 2.684931506849315) internal successors, (5096), 1898 states have internal predecessors, (5096), 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) [2021-05-21 20:30:22,238 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1899 states to 1899 states and 5096 transitions. [2021-05-21 20:30:22,238 INFO L78 Accepts]: Start accepts. Automaton has 1899 states and 5096 transitions. Word has length 26 [2021-05-21 20:30:22,238 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-21 20:30:22,238 INFO L482 AbstractCegarLoop]: Abstraction has 1899 states and 5096 transitions. [2021-05-21 20:30:22,238 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 4.333333333333333) internal successors, (26), 5 states have internal predecessors, (26), 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) [2021-05-21 20:30:22,238 INFO L276 IsEmpty]: Start isEmpty. Operand 1899 states and 5096 transitions. [2021-05-21 20:30:22,240 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-21 20:30:22,240 INFO L513 BasicCegarLoop]: Found error trace [2021-05-21 20:30:22,240 INFO L521 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-21 20:30:22,455 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable57,31 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-21 20:30:22,456 INFO L430 AbstractCegarLoop]: === Iteration 39 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-21 20:30:22,456 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-21 20:30:22,456 INFO L82 PathProgramCache]: Analyzing trace with hash -1111998297, now seen corresponding path program 22 times [2021-05-21 20:30:22,456 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-21 20:30:22,456 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1337261863] [2021-05-21 20:30:22,456 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-21 20:30:22,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 20:30:22,485 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 13 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-21 20:30:22,485 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-21 20:30:22,485 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1337261863] [2021-05-21 20:30:22,485 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1337261863] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:22,485 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [888252796] [2021-05-21 20:30:22,485 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 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-21 20:30:22,506 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-21 20:30:22,506 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-21 20:30:22,506 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-21 20:30:22,507 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-21 20:30:22,552 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 13 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-21 20:30:22,552 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [888252796] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:22,552 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-21 20:30:22,552 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 5 [2021-05-21 20:30:22,552 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [106782045] [2021-05-21 20:30:22,552 INFO L462 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-21 20:30:22,552 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-21 20:30:22,553 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-21 20:30:22,553 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-21 20:30:22,553 INFO L87 Difference]: Start difference. First operand 1899 states and 5096 transitions. Second operand has 6 states, 6 states have (on average 4.166666666666667) internal successors, (25), 5 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) [2021-05-21 20:30:22,639 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-21 20:30:22,640 INFO L93 Difference]: Finished difference Result 2552 states and 6599 transitions. [2021-05-21 20:30:22,640 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-21 20:30:22,640 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.166666666666667) internal successors, (25), 5 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) Word has length 26 [2021-05-21 20:30:22,640 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-21 20:30:22,642 INFO L225 Difference]: With dead ends: 2552 [2021-05-21 20:30:22,642 INFO L226 Difference]: Without dead ends: 2552 [2021-05-21 20:30:22,642 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 27 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 35.8ms TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-21 20:30:22,644 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2552 states. [2021-05-21 20:30:22,662 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2552 to 2092. [2021-05-21 20:30:22,664 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2092 states, 2091 states have (on average 2.713534194165471) internal successors, (5674), 2091 states have internal predecessors, (5674), 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) [2021-05-21 20:30:22,666 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2092 states to 2092 states and 5674 transitions. [2021-05-21 20:30:22,666 INFO L78 Accepts]: Start accepts. Automaton has 2092 states and 5674 transitions. Word has length 26 [2021-05-21 20:30:22,667 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-21 20:30:22,667 INFO L482 AbstractCegarLoop]: Abstraction has 2092 states and 5674 transitions. [2021-05-21 20:30:22,667 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 4.166666666666667) internal successors, (25), 5 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) [2021-05-21 20:30:22,667 INFO L276 IsEmpty]: Start isEmpty. Operand 2092 states and 5674 transitions. [2021-05-21 20:30:22,669 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-21 20:30:22,669 INFO L513 BasicCegarLoop]: Found error trace [2021-05-21 20:30:22,669 INFO L521 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-21 20:30:22,884 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable59 [2021-05-21 20:30:22,884 INFO L430 AbstractCegarLoop]: === Iteration 40 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-21 20:30:22,885 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-21 20:30:22,885 INFO L82 PathProgramCache]: Analyzing trace with hash -1689374502, now seen corresponding path program 23 times [2021-05-21 20:30:22,885 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-21 20:30:22,885 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1534973977] [2021-05-21 20:30:22,885 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-21 20:30:22,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 20:30:22,922 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 11 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-21 20:30:22,922 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-21 20:30:22,922 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1534973977] [2021-05-21 20:30:22,922 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1534973977] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:22,922 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1748746051] [2021-05-21 20:30:22,922 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 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-05-21 20:30:22,960 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-05-21 20:30:22,961 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-21 20:30:22,961 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-21 20:30:22,961 INFO L286 TraceCheckSpWp]: Computing forward predicates... Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-21 20:30:23,000 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 13 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-21 20:30:23,001 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1748746051] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:23,001 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-21 20:30:23,001 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 7] total 7 [2021-05-21 20:30:23,001 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1456898714] [2021-05-21 20:30:23,001 INFO L462 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-21 20:30:23,001 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-21 20:30:23,001 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-21 20:30:23,001 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-05-21 20:30:23,001 INFO L87 Difference]: Start difference. First operand 2092 states and 5674 transitions. Second operand has 8 states, 8 states have (on average 4.125) internal successors, (33), 7 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) [2021-05-21 20:30:23,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-21 20:30:23,086 INFO L93 Difference]: Finished difference Result 3728 states and 10027 transitions. [2021-05-21 20:30:23,087 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-21 20:30:23,087 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.125) internal successors, (33), 7 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 26 [2021-05-21 20:30:23,087 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-21 20:30:23,090 INFO L225 Difference]: With dead ends: 3728 [2021-05-21 20:30:23,090 INFO L226 Difference]: Without dead ends: 3712 [2021-05-21 20:30:23,090 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 32.9ms TimeCoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2021-05-21 20:30:23,093 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3712 states. [2021-05-21 20:30:23,123 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3712 to 3201. [2021-05-21 20:30:23,125 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3201 states, 3200 states have (on average 2.8134375) internal successors, (9003), 3200 states have internal predecessors, (9003), 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) [2021-05-21 20:30:23,130 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3201 states to 3201 states and 9003 transitions. [2021-05-21 20:30:23,130 INFO L78 Accepts]: Start accepts. Automaton has 3201 states and 9003 transitions. Word has length 26 [2021-05-21 20:30:23,130 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-21 20:30:23,130 INFO L482 AbstractCegarLoop]: Abstraction has 3201 states and 9003 transitions. [2021-05-21 20:30:23,130 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 4.125) internal successors, (33), 7 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) [2021-05-21 20:30:23,130 INFO L276 IsEmpty]: Start isEmpty. Operand 3201 states and 9003 transitions. [2021-05-21 20:30:23,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-21 20:30:23,133 INFO L513 BasicCegarLoop]: Found error trace [2021-05-21 20:30:23,133 INFO L521 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-21 20:30:23,348 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable60 [2021-05-21 20:30:23,348 INFO L430 AbstractCegarLoop]: === Iteration 41 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-21 20:30:23,349 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-21 20:30:23,349 INFO L82 PathProgramCache]: Analyzing trace with hash 1983712384, now seen corresponding path program 24 times [2021-05-21 20:30:23,349 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-21 20:30:23,349 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [510824014] [2021-05-21 20:30:23,349 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-21 20:30:23,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 20:30:23,375 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 10 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-21 20:30:23,376 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-21 20:30:23,376 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [510824014] [2021-05-21 20:30:23,376 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [510824014] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:23,376 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2050520307] [2021-05-21 20:30:23,376 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 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-21 20:30:23,400 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-05-21 20:30:23,400 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-21 20:30:23,401 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-21 20:30:23,401 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-21 20:30:23,441 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 12 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-21 20:30:23,442 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2050520307] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:23,442 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-21 20:30:23,442 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 7] total 7 [2021-05-21 20:30:23,442 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1278418816] [2021-05-21 20:30:23,442 INFO L462 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-21 20:30:23,442 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-21 20:30:23,442 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-21 20:30:23,442 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-05-21 20:30:23,442 INFO L87 Difference]: Start difference. First operand 3201 states and 9003 transitions. Second operand has 8 states, 8 states have (on average 4.125) internal successors, (33), 7 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) [2021-05-21 20:30:23,552 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-21 20:30:23,552 INFO L93 Difference]: Finished difference Result 3830 states and 10240 transitions. [2021-05-21 20:30:23,552 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-21 20:30:23,552 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.125) internal successors, (33), 7 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 26 [2021-05-21 20:30:23,553 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-21 20:30:23,556 INFO L225 Difference]: With dead ends: 3830 [2021-05-21 20:30:23,556 INFO L226 Difference]: Without dead ends: 3830 [2021-05-21 20:30:23,556 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 43.2ms TimeCoverageRelationStatistics Valid=45, Invalid=65, Unknown=0, NotChecked=0, Total=110 [2021-05-21 20:30:23,559 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3830 states. [2021-05-21 20:30:23,601 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3830 to 3216. [2021-05-21 20:30:23,603 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3216 states, 3215 states have (on average 2.805909797822706) internal successors, (9021), 3215 states have internal predecessors, (9021), 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) [2021-05-21 20:30:23,608 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3216 states to 3216 states and 9021 transitions. [2021-05-21 20:30:23,608 INFO L78 Accepts]: Start accepts. Automaton has 3216 states and 9021 transitions. Word has length 26 [2021-05-21 20:30:23,608 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-21 20:30:23,608 INFO L482 AbstractCegarLoop]: Abstraction has 3216 states and 9021 transitions. [2021-05-21 20:30:23,608 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 4.125) internal successors, (33), 7 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) [2021-05-21 20:30:23,608 INFO L276 IsEmpty]: Start isEmpty. Operand 3216 states and 9021 transitions. [2021-05-21 20:30:23,610 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-21 20:30:23,610 INFO L513 BasicCegarLoop]: Found error trace [2021-05-21 20:30:23,610 INFO L521 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-21 20:30:23,824 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable62,34 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-21 20:30:23,825 INFO L430 AbstractCegarLoop]: === Iteration 42 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-21 20:30:23,825 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-21 20:30:23,825 INFO L82 PathProgramCache]: Analyzing trace with hash 1051895937, now seen corresponding path program 25 times [2021-05-21 20:30:23,825 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-21 20:30:23,825 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1505947972] [2021-05-21 20:30:23,825 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-21 20:30:23,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 20:30:23,853 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 9 proven. 5 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-21 20:30:23,853 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-21 20:30:23,853 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1505947972] [2021-05-21 20:30:23,854 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1505947972] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:23,854 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [122295865] [2021-05-21 20:30:23,854 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 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-21 20:30:23,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 20:30:23,874 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-21 20:30:23,875 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-21 20:30:23,923 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 9 proven. 5 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-21 20:30:23,923 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [122295865] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:23,923 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-21 20:30:23,923 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 5 [2021-05-21 20:30:23,924 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [253751934] [2021-05-21 20:30:23,924 INFO L462 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-21 20:30:23,924 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-21 20:30:23,924 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-21 20:30:23,924 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-21 20:30:23,924 INFO L87 Difference]: Start difference. First operand 3216 states and 9021 transitions. Second operand has 6 states, 6 states have (on average 4.166666666666667) internal successors, (25), 5 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) [2021-05-21 20:30:24,000 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-21 20:30:24,000 INFO L93 Difference]: Finished difference Result 3629 states and 9839 transitions. [2021-05-21 20:30:24,000 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-21 20:30:24,000 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.166666666666667) internal successors, (25), 5 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) Word has length 26 [2021-05-21 20:30:24,000 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-21 20:30:24,004 INFO L225 Difference]: With dead ends: 3629 [2021-05-21 20:30:24,004 INFO L226 Difference]: Without dead ends: 3617 [2021-05-21 20:30:24,004 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 26.9ms TimeCoverageRelationStatistics Valid=24, Invalid=32, Unknown=0, NotChecked=0, Total=56 [2021-05-21 20:30:24,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3617 states. [2021-05-21 20:30:24,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3617 to 3079. [2021-05-21 20:30:24,035 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3079 states, 3078 states have (on average 2.7979207277452893) internal successors, (8612), 3078 states have internal predecessors, (8612), 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) [2021-05-21 20:30:24,039 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3079 states to 3079 states and 8612 transitions. [2021-05-21 20:30:24,039 INFO L78 Accepts]: Start accepts. Automaton has 3079 states and 8612 transitions. Word has length 26 [2021-05-21 20:30:24,040 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-21 20:30:24,040 INFO L482 AbstractCegarLoop]: Abstraction has 3079 states and 8612 transitions. [2021-05-21 20:30:24,040 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 4.166666666666667) internal successors, (25), 5 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) [2021-05-21 20:30:24,040 INFO L276 IsEmpty]: Start isEmpty. Operand 3079 states and 8612 transitions. [2021-05-21 20:30:24,042 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-21 20:30:24,042 INFO L513 BasicCegarLoop]: Found error trace [2021-05-21 20:30:24,042 INFO L521 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-21 20:30:24,258 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable63 [2021-05-21 20:30:24,258 INFO L430 AbstractCegarLoop]: === Iteration 43 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-21 20:30:24,258 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-21 20:30:24,258 INFO L82 PathProgramCache]: Analyzing trace with hash 346139928, now seen corresponding path program 26 times [2021-05-21 20:30:24,258 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-21 20:30:24,259 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [570302565] [2021-05-21 20:30:24,259 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-21 20:30:24,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 20:30:24,290 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 11 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-21 20:30:24,290 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-21 20:30:24,290 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [570302565] [2021-05-21 20:30:24,290 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [570302565] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:24,290 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [56748877] [2021-05-21 20:30:24,291 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 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-21 20:30:24,312 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-21 20:30:24,312 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-21 20:30:24,313 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-21 20:30:24,313 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-21 20:30:24,349 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 12 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-21 20:30:24,349 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [56748877] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:24,349 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-21 20:30:24,349 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 7 [2021-05-21 20:30:24,349 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [782290995] [2021-05-21 20:30:24,349 INFO L462 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-21 20:30:24,349 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-21 20:30:24,350 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-21 20:30:24,350 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-05-21 20:30:24,350 INFO L87 Difference]: Start difference. First operand 3079 states and 8612 transitions. Second operand has 8 states, 8 states have (on average 3.75) internal successors, (30), 7 states have internal predecessors, (30), 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) [2021-05-21 20:30:24,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-21 20:30:24,481 INFO L93 Difference]: Finished difference Result 4208 states and 11364 transitions. [2021-05-21 20:30:24,482 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-21 20:30:24,482 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.75) internal successors, (30), 7 states have internal predecessors, (30), 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 26 [2021-05-21 20:30:24,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-21 20:30:24,486 INFO L225 Difference]: With dead ends: 4208 [2021-05-21 20:30:24,486 INFO L226 Difference]: Without dead ends: 4208 [2021-05-21 20:30:24,486 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 56.6ms TimeCoverageRelationStatistics Valid=50, Invalid=82, Unknown=0, NotChecked=0, Total=132 [2021-05-21 20:30:24,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4208 states. [2021-05-21 20:30:24,518 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4208 to 3506. [2021-05-21 20:30:24,521 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3506 states, 3505 states have (on average 2.8185449358059915) internal successors, (9879), 3505 states have internal predecessors, (9879), 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) [2021-05-21 20:30:24,526 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3506 states to 3506 states and 9879 transitions. [2021-05-21 20:30:24,526 INFO L78 Accepts]: Start accepts. Automaton has 3506 states and 9879 transitions. Word has length 26 [2021-05-21 20:30:24,526 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-21 20:30:24,526 INFO L482 AbstractCegarLoop]: Abstraction has 3506 states and 9879 transitions. [2021-05-21 20:30:24,526 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 3.75) internal successors, (30), 7 states have internal predecessors, (30), 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) [2021-05-21 20:30:24,526 INFO L276 IsEmpty]: Start isEmpty. Operand 3506 states and 9879 transitions. [2021-05-21 20:30:24,529 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-21 20:30:24,529 INFO L513 BasicCegarLoop]: Found error trace [2021-05-21 20:30:24,529 INFO L521 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-21 20:30:24,740 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable65,36 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-21 20:30:24,741 INFO L430 AbstractCegarLoop]: === Iteration 44 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-21 20:30:24,741 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-21 20:30:24,741 INFO L82 PathProgramCache]: Analyzing trace with hash 1258958503, now seen corresponding path program 27 times [2021-05-21 20:30:24,741 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-21 20:30:24,741 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [676020775] [2021-05-21 20:30:24,741 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-21 20:30:24,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 20:30:24,768 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 9 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-21 20:30:24,768 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-21 20:30:24,768 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [676020775] [2021-05-21 20:30:24,768 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [676020775] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:24,768 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [544318988] [2021-05-21 20:30:24,768 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 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-21 20:30:24,797 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-21 20:30:24,797 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-21 20:30:24,798 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-21 20:30:24,798 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-21 20:30:24,830 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 9 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-21 20:30:24,830 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [544318988] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:24,830 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-21 20:30:24,830 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2021-05-21 20:30:24,830 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1714001613] [2021-05-21 20:30:24,831 INFO L462 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-21 20:30:24,831 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-21 20:30:24,831 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-21 20:30:24,831 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-05-21 20:30:24,831 INFO L87 Difference]: Start difference. First operand 3506 states and 9879 transitions. Second operand has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 6 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) [2021-05-21 20:30:24,939 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-21 20:30:24,939 INFO L93 Difference]: Finished difference Result 3876 states and 10634 transitions. [2021-05-21 20:30:24,939 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-21 20:30:24,939 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 6 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) Word has length 26 [2021-05-21 20:30:24,939 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-21 20:30:24,943 INFO L225 Difference]: With dead ends: 3876 [2021-05-21 20:30:24,943 INFO L226 Difference]: Without dead ends: 3864 [2021-05-21 20:30:24,944 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 36.5ms TimeCoverageRelationStatistics Valid=35, Invalid=55, Unknown=0, NotChecked=0, Total=90 [2021-05-21 20:30:24,947 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3864 states. [2021-05-21 20:30:24,980 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3864 to 3527. [2021-05-21 20:30:24,983 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3527 states, 3526 states have (on average 2.811401020986954) internal successors, (9913), 3526 states have internal predecessors, (9913), 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) [2021-05-21 20:30:24,988 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3527 states to 3527 states and 9913 transitions. [2021-05-21 20:30:24,988 INFO L78 Accepts]: Start accepts. Automaton has 3527 states and 9913 transitions. Word has length 26 [2021-05-21 20:30:24,989 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-21 20:30:24,989 INFO L482 AbstractCegarLoop]: Abstraction has 3527 states and 9913 transitions. [2021-05-21 20:30:24,989 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 6 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) [2021-05-21 20:30:24,989 INFO L276 IsEmpty]: Start isEmpty. Operand 3527 states and 9913 transitions. [2021-05-21 20:30:24,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-21 20:30:24,992 INFO L513 BasicCegarLoop]: Found error trace [2021-05-21 20:30:24,992 INFO L521 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-21 20:30:25,196 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable66 [2021-05-21 20:30:25,197 INFO L430 AbstractCegarLoop]: === Iteration 45 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-21 20:30:25,197 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-21 20:30:25,197 INFO L82 PathProgramCache]: Analyzing trace with hash -1264613717, now seen corresponding path program 28 times [2021-05-21 20:30:25,197 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-21 20:30:25,197 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2045825634] [2021-05-21 20:30:25,197 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-21 20:30:25,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 20:30:25,230 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 3 proven. 12 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-21 20:30:25,230 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-21 20:30:25,230 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2045825634] [2021-05-21 20:30:25,230 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2045825634] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:25,230 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1055447525] [2021-05-21 20:30:25,230 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 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-21 20:30:25,252 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-21 20:30:25,252 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-21 20:30:25,252 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-21 20:30:25,253 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-21 20:30:25,315 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 14 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-21 20:30:25,315 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1055447525] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:25,315 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-21 20:30:25,316 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2021-05-21 20:30:25,316 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [285653579] [2021-05-21 20:30:25,316 INFO L462 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-21 20:30:25,316 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-21 20:30:25,316 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-21 20:30:25,316 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=53, Unknown=0, NotChecked=0, Total=90 [2021-05-21 20:30:25,316 INFO L87 Difference]: Start difference. First operand 3527 states and 9913 transitions. Second operand has 10 states, 10 states have (on average 3.3) internal successors, (33), 9 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) [2021-05-21 20:30:25,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-21 20:30:25,481 INFO L93 Difference]: Finished difference Result 4288 states and 11605 transitions. [2021-05-21 20:30:25,481 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-21 20:30:25,481 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.3) internal successors, (33), 9 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 26 [2021-05-21 20:30:25,481 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-21 20:30:25,486 INFO L225 Difference]: With dead ends: 4288 [2021-05-21 20:30:25,486 INFO L226 Difference]: Without dead ends: 4288 [2021-05-21 20:30:25,486 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 81.4ms TimeCoverageRelationStatistics Valid=77, Invalid=105, Unknown=0, NotChecked=0, Total=182 [2021-05-21 20:30:25,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4288 states. [2021-05-21 20:30:25,523 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4288 to 3636. [2021-05-21 20:30:25,525 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3636 states, 3635 states have (on average 2.817881705639615) internal successors, (10243), 3635 states have internal predecessors, (10243), 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) [2021-05-21 20:30:25,530 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3636 states to 3636 states and 10243 transitions. [2021-05-21 20:30:25,530 INFO L78 Accepts]: Start accepts. Automaton has 3636 states and 10243 transitions. Word has length 26 [2021-05-21 20:30:25,531 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-21 20:30:25,531 INFO L482 AbstractCegarLoop]: Abstraction has 3636 states and 10243 transitions. [2021-05-21 20:30:25,531 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.3) internal successors, (33), 9 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) [2021-05-21 20:30:25,531 INFO L276 IsEmpty]: Start isEmpty. Operand 3636 states and 10243 transitions. [2021-05-21 20:30:25,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-21 20:30:25,533 INFO L513 BasicCegarLoop]: Found error trace [2021-05-21 20:30:25,533 INFO L521 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-21 20:30:25,740 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable69 [2021-05-21 20:30:25,741 INFO L430 AbstractCegarLoop]: === Iteration 46 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-21 20:30:25,741 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-21 20:30:25,741 INFO L82 PathProgramCache]: Analyzing trace with hash -535116392, now seen corresponding path program 29 times [2021-05-21 20:30:25,741 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-21 20:30:25,741 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1272794344] [2021-05-21 20:30:25,741 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-21 20:30:25,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 20:30:25,771 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 8 proven. 7 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-21 20:30:25,771 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-21 20:30:25,771 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1272794344] [2021-05-21 20:30:25,771 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1272794344] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:25,771 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1416413435] [2021-05-21 20:30:25,771 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 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-21 20:30:25,795 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-05-21 20:30:25,795 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-21 20:30:25,795 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-21 20:30:25,796 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-21 20:30:25,844 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 9 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-21 20:30:25,844 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1416413435] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:25,844 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-21 20:30:25,844 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 8 [2021-05-21 20:30:25,844 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1215668460] [2021-05-21 20:30:25,844 INFO L462 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-21 20:30:25,844 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-21 20:30:25,844 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-21 20:30:25,845 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-05-21 20:30:25,845 INFO L87 Difference]: Start difference. First operand 3636 states and 10243 transitions. Second operand has 9 states, 9 states have (on average 3.7777777777777777) internal successors, (34), 8 states have internal predecessors, (34), 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) [2021-05-21 20:30:25,959 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-21 20:30:25,959 INFO L93 Difference]: Finished difference Result 4890 states and 13623 transitions. [2021-05-21 20:30:25,959 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-21 20:30:25,959 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.7777777777777777) internal successors, (34), 8 states have internal predecessors, (34), 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 26 [2021-05-21 20:30:25,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-21 20:30:25,964 INFO L225 Difference]: With dead ends: 4890 [2021-05-21 20:30:25,964 INFO L226 Difference]: Without dead ends: 4858 [2021-05-21 20:30:25,964 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 48.4ms TimeCoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2021-05-21 20:30:25,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4858 states. [2021-05-21 20:30:26,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4858 to 4449. [2021-05-21 20:30:26,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4449 states, 4448 states have (on average 2.8424010791366907) internal successors, (12643), 4448 states have internal predecessors, (12643), 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) [2021-05-21 20:30:26,041 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4449 states to 4449 states and 12643 transitions. [2021-05-21 20:30:26,041 INFO L78 Accepts]: Start accepts. Automaton has 4449 states and 12643 transitions. Word has length 26 [2021-05-21 20:30:26,041 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-21 20:30:26,041 INFO L482 AbstractCegarLoop]: Abstraction has 4449 states and 12643 transitions. [2021-05-21 20:30:26,041 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 3.7777777777777777) internal successors, (34), 8 states have internal predecessors, (34), 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) [2021-05-21 20:30:26,041 INFO L276 IsEmpty]: Start isEmpty. Operand 4449 states and 12643 transitions. [2021-05-21 20:30:26,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-21 20:30:26,044 INFO L513 BasicCegarLoop]: Found error trace [2021-05-21 20:30:26,044 INFO L521 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-21 20:30:26,260 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable72,39 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-21 20:30:26,260 INFO L430 AbstractCegarLoop]: === Iteration 47 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-21 20:30:26,260 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-21 20:30:26,260 INFO L82 PathProgramCache]: Analyzing trace with hash -2036715645, now seen corresponding path program 30 times [2021-05-21 20:30:26,260 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-21 20:30:26,261 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [396075755] [2021-05-21 20:30:26,261 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-21 20:30:26,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 20:30:26,294 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 14 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-21 20:30:26,294 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-21 20:30:26,294 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [396075755] [2021-05-21 20:30:26,294 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [396075755] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:26,294 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1579016301] [2021-05-21 20:30:26,295 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 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-21 20:30:26,317 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-05-21 20:30:26,317 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-21 20:30:26,317 INFO L263 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-21 20:30:26,318 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-21 20:30:26,369 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 14 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-21 20:30:26,369 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1579016301] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:26,369 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-21 20:30:26,370 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 5 [2021-05-21 20:30:26,370 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2043158019] [2021-05-21 20:30:26,370 INFO L462 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-21 20:30:26,370 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-21 20:30:26,370 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-21 20:30:26,370 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-21 20:30:26,370 INFO L87 Difference]: Start difference. First operand 4449 states and 12643 transitions. Second operand has 6 states, 6 states have (on average 4.333333333333333) internal successors, (26), 5 states have internal predecessors, (26), 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) [2021-05-21 20:30:26,460 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-21 20:30:26,460 INFO L93 Difference]: Finished difference Result 5697 states and 15817 transitions. [2021-05-21 20:30:26,461 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-21 20:30:26,461 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.333333333333333) internal successors, (26), 5 states have internal predecessors, (26), 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 26 [2021-05-21 20:30:26,461 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-21 20:30:26,466 INFO L225 Difference]: With dead ends: 5697 [2021-05-21 20:30:26,466 INFO L226 Difference]: Without dead ends: 5697 [2021-05-21 20:30:26,466 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 27 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 41.1ms TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-21 20:30:26,470 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5697 states. [2021-05-21 20:30:26,514 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5697 to 5030. [2021-05-21 20:30:26,518 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5030 states, 5029 states have (on average 2.8657784847882284) internal successors, (14412), 5029 states have internal predecessors, (14412), 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) [2021-05-21 20:30:26,525 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5030 states to 5030 states and 14412 transitions. [2021-05-21 20:30:26,526 INFO L78 Accepts]: Start accepts. Automaton has 5030 states and 14412 transitions. Word has length 26 [2021-05-21 20:30:26,526 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-21 20:30:26,526 INFO L482 AbstractCegarLoop]: Abstraction has 5030 states and 14412 transitions. [2021-05-21 20:30:26,526 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 4.333333333333333) internal successors, (26), 5 states have internal predecessors, (26), 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) [2021-05-21 20:30:26,526 INFO L276 IsEmpty]: Start isEmpty. Operand 5030 states and 14412 transitions. [2021-05-21 20:30:26,529 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-21 20:30:26,529 INFO L513 BasicCegarLoop]: Found error trace [2021-05-21 20:30:26,529 INFO L521 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-21 20:30:26,742 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable75,40 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-21 20:30:26,742 INFO L430 AbstractCegarLoop]: === Iteration 48 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-21 20:30:26,742 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-21 20:30:26,742 INFO L82 PathProgramCache]: Analyzing trace with hash 1680875446, now seen corresponding path program 31 times [2021-05-21 20:30:26,742 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-21 20:30:26,742 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1113185641] [2021-05-21 20:30:26,742 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-21 20:30:26,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 20:30:26,765 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 12 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-21 20:30:26,766 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-21 20:30:26,766 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1113185641] [2021-05-21 20:30:26,766 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1113185641] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:26,766 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1462492541] [2021-05-21 20:30:26,766 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 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-21 20:30:26,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 20:30:26,786 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-21 20:30:26,786 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-21 20:30:26,828 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 13 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-21 20:30:26,829 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1462492541] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:26,829 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-21 20:30:26,829 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6] total 6 [2021-05-21 20:30:26,829 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1665115228] [2021-05-21 20:30:26,829 INFO L462 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-21 20:30:26,829 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-21 20:30:26,829 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-21 20:30:26,829 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-21 20:30:26,829 INFO L87 Difference]: Start difference. First operand 5030 states and 14412 transitions. Second operand has 7 states, 7 states have (on average 4.428571428571429) internal successors, (31), 6 states have internal predecessors, (31), 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) [2021-05-21 20:30:26,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-21 20:30:26,928 INFO L93 Difference]: Finished difference Result 6176 states and 17476 transitions. [2021-05-21 20:30:26,928 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-21 20:30:26,928 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.428571428571429) internal successors, (31), 6 states have internal predecessors, (31), 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 26 [2021-05-21 20:30:26,928 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-21 20:30:26,934 INFO L225 Difference]: With dead ends: 6176 [2021-05-21 20:30:26,934 INFO L226 Difference]: Without dead ends: 6160 [2021-05-21 20:30:26,935 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 37.2ms TimeCoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2021-05-21 20:30:26,939 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6160 states. [2021-05-21 20:30:26,983 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6160 to 5779. [2021-05-21 20:30:26,987 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5779 states, 5778 states have (on average 2.8816199376947043) internal successors, (16650), 5778 states have internal predecessors, (16650), 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) [2021-05-21 20:30:26,995 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5779 states to 5779 states and 16650 transitions. [2021-05-21 20:30:26,995 INFO L78 Accepts]: Start accepts. Automaton has 5779 states and 16650 transitions. Word has length 26 [2021-05-21 20:30:26,995 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-21 20:30:26,996 INFO L482 AbstractCegarLoop]: Abstraction has 5779 states and 16650 transitions. [2021-05-21 20:30:26,996 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 4.428571428571429) internal successors, (31), 6 states have internal predecessors, (31), 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) [2021-05-21 20:30:26,996 INFO L276 IsEmpty]: Start isEmpty. Operand 5779 states and 16650 transitions. [2021-05-21 20:30:26,998 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-21 20:30:26,998 INFO L513 BasicCegarLoop]: Found error trace [2021-05-21 20:30:26,998 INFO L521 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-21 20:30:27,199 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable76,41 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-21 20:30:27,199 INFO L430 AbstractCegarLoop]: === Iteration 49 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-21 20:30:27,199 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-21 20:30:27,199 INFO L82 PathProgramCache]: Analyzing trace with hash 1058995036, now seen corresponding path program 32 times [2021-05-21 20:30:27,199 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-21 20:30:27,199 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1445026419] [2021-05-21 20:30:27,199 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-21 20:30:27,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 20:30:27,225 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 12 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-21 20:30:27,225 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-21 20:30:27,225 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1445026419] [2021-05-21 20:30:27,225 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1445026419] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:27,225 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1456785810] [2021-05-21 20:30:27,225 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 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-21 20:30:27,246 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-21 20:30:27,247 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-21 20:30:27,247 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-21 20:30:27,247 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-21 20:30:27,295 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 13 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-21 20:30:27,295 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1456785810] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:27,295 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-21 20:30:27,295 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6] total 6 [2021-05-21 20:30:27,295 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1771667692] [2021-05-21 20:30:27,295 INFO L462 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-21 20:30:27,295 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-21 20:30:27,295 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-21 20:30:27,295 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-21 20:30:27,295 INFO L87 Difference]: Start difference. First operand 5779 states and 16650 transitions. Second operand has 7 states, 7 states have (on average 4.428571428571429) internal successors, (31), 6 states have internal predecessors, (31), 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) [2021-05-21 20:30:27,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-21 20:30:27,404 INFO L93 Difference]: Finished difference Result 6311 states and 17791 transitions. [2021-05-21 20:30:27,404 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-21 20:30:27,404 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.428571428571429) internal successors, (31), 6 states have internal predecessors, (31), 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 26 [2021-05-21 20:30:27,404 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-21 20:30:27,410 INFO L225 Difference]: With dead ends: 6311 [2021-05-21 20:30:27,410 INFO L226 Difference]: Without dead ends: 6311 [2021-05-21 20:30:27,411 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 26 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 43.3ms TimeCoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2021-05-21 20:30:27,436 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6311 states. [2021-05-21 20:30:27,480 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6311 to 5796. [2021-05-21 20:30:27,484 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5796 states, 5795 states have (on average 2.8807592752372737) internal successors, (16694), 5795 states have internal predecessors, (16694), 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) [2021-05-21 20:30:27,492 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5796 states to 5796 states and 16694 transitions. [2021-05-21 20:30:27,492 INFO L78 Accepts]: Start accepts. Automaton has 5796 states and 16694 transitions. Word has length 26 [2021-05-21 20:30:27,492 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-21 20:30:27,492 INFO L482 AbstractCegarLoop]: Abstraction has 5796 states and 16694 transitions. [2021-05-21 20:30:27,492 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 4.428571428571429) internal successors, (31), 6 states have internal predecessors, (31), 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) [2021-05-21 20:30:27,492 INFO L276 IsEmpty]: Start isEmpty. Operand 5796 states and 16694 transitions. [2021-05-21 20:30:27,495 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-21 20:30:27,495 INFO L513 BasicCegarLoop]: Found error trace [2021-05-21 20:30:27,495 INFO L521 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-21 20:30:27,695 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable78 [2021-05-21 20:30:27,695 INFO L430 AbstractCegarLoop]: === Iteration 50 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-21 20:30:27,696 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-21 20:30:27,696 INFO L82 PathProgramCache]: Analyzing trace with hash 127178589, now seen corresponding path program 33 times [2021-05-21 20:30:27,696 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-21 20:30:27,696 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1717008836] [2021-05-21 20:30:27,696 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-21 20:30:27,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 20:30:27,718 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 9 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-21 20:30:27,718 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-21 20:30:27,718 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1717008836] [2021-05-21 20:30:27,718 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1717008836] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:27,719 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1035941590] [2021-05-21 20:30:27,719 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 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-21 20:30:27,740 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-21 20:30:27,740 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-21 20:30:27,741 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-21 20:30:27,741 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-21 20:30:27,786 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 9 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-21 20:30:27,787 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1035941590] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:27,787 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-21 20:30:27,787 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 5 [2021-05-21 20:30:27,787 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [708442609] [2021-05-21 20:30:27,787 INFO L462 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-21 20:30:27,787 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-21 20:30:27,787 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-21 20:30:27,787 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-21 20:30:27,787 INFO L87 Difference]: Start difference. First operand 5796 states and 16694 transitions. Second operand has 6 states, 6 states have (on average 4.333333333333333) internal successors, (26), 5 states have internal predecessors, (26), 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) [2021-05-21 20:30:27,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-21 20:30:27,849 INFO L93 Difference]: Finished difference Result 6492 states and 18169 transitions. [2021-05-21 20:30:27,850 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-21 20:30:27,850 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.333333333333333) internal successors, (26), 5 states have internal predecessors, (26), 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 26 [2021-05-21 20:30:27,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-21 20:30:27,856 INFO L225 Difference]: With dead ends: 6492 [2021-05-21 20:30:27,856 INFO L226 Difference]: Without dead ends: 6489 [2021-05-21 20:30:27,857 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 20.7ms TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-05-21 20:30:27,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6489 states. [2021-05-21 20:30:27,916 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6489 to 5795. [2021-05-21 20:30:27,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5795 states, 5794 states have (on average 2.8795305488436314) internal successors, (16684), 5794 states have internal predecessors, (16684), 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) [2021-05-21 20:30:27,928 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5795 states to 5795 states and 16684 transitions. [2021-05-21 20:30:27,928 INFO L78 Accepts]: Start accepts. Automaton has 5795 states and 16684 transitions. Word has length 26 [2021-05-21 20:30:27,928 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-21 20:30:27,928 INFO L482 AbstractCegarLoop]: Abstraction has 5795 states and 16684 transitions. [2021-05-21 20:30:27,928 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 4.333333333333333) internal successors, (26), 5 states have internal predecessors, (26), 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) [2021-05-21 20:30:27,928 INFO L276 IsEmpty]: Start isEmpty. Operand 5795 states and 16684 transitions. [2021-05-21 20:30:27,931 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-21 20:30:27,931 INFO L513 BasicCegarLoop]: Found error trace [2021-05-21 20:30:27,931 INFO L521 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-21 20:30:28,132 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable79,43 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-21 20:30:28,133 INFO L430 AbstractCegarLoop]: === Iteration 51 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-21 20:30:28,133 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-21 20:30:28,133 INFO L82 PathProgramCache]: Analyzing trace with hash -578577420, now seen corresponding path program 34 times [2021-05-21 20:30:28,133 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-21 20:30:28,133 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1958350030] [2021-05-21 20:30:28,133 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-21 20:30:28,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 20:30:28,163 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 13 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-21 20:30:28,163 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-21 20:30:28,163 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1958350030] [2021-05-21 20:30:28,163 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1958350030] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:28,163 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [629796545] [2021-05-21 20:30:28,163 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 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-21 20:30:28,184 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-21 20:30:28,184 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-21 20:30:28,185 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-21 20:30:28,185 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-21 20:30:28,229 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 13 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-21 20:30:28,230 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [629796545] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:28,230 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-21 20:30:28,230 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 7 [2021-05-21 20:30:28,230 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [447585036] [2021-05-21 20:30:28,230 INFO L462 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-21 20:30:28,230 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-21 20:30:28,230 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-21 20:30:28,230 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2021-05-21 20:30:28,230 INFO L87 Difference]: Start difference. First operand 5795 states and 16684 transitions. Second operand has 8 states, 8 states have (on average 3.875) internal successors, (31), 7 states have internal predecessors, (31), 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) [2021-05-21 20:30:28,372 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-21 20:30:28,372 INFO L93 Difference]: Finished difference Result 6497 states and 18243 transitions. [2021-05-21 20:30:28,372 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-21 20:30:28,372 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.875) internal successors, (31), 7 states have internal predecessors, (31), 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 26 [2021-05-21 20:30:28,372 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-21 20:30:28,379 INFO L225 Difference]: With dead ends: 6497 [2021-05-21 20:30:28,379 INFO L226 Difference]: Without dead ends: 6497 [2021-05-21 20:30:28,379 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 65.1ms TimeCoverageRelationStatistics Valid=62, Invalid=94, Unknown=0, NotChecked=0, Total=156 [2021-05-21 20:30:28,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6497 states. [2021-05-21 20:30:28,431 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6497 to 5692. [2021-05-21 20:30:28,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5692 states, 5691 states have (on average 2.870848708487085) internal successors, (16338), 5691 states have internal predecessors, (16338), 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) [2021-05-21 20:30:28,478 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5692 states to 5692 states and 16338 transitions. [2021-05-21 20:30:28,478 INFO L78 Accepts]: Start accepts. Automaton has 5692 states and 16338 transitions. Word has length 26 [2021-05-21 20:30:28,478 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-21 20:30:28,478 INFO L482 AbstractCegarLoop]: Abstraction has 5692 states and 16338 transitions. [2021-05-21 20:30:28,478 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 3.875) internal successors, (31), 7 states have internal predecessors, (31), 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) [2021-05-21 20:30:28,478 INFO L276 IsEmpty]: Start isEmpty. Operand 5692 states and 16338 transitions. [2021-05-21 20:30:28,481 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-21 20:30:28,481 INFO L513 BasicCegarLoop]: Found error trace [2021-05-21 20:30:28,481 INFO L521 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-21 20:30:28,681 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable81,44 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-21 20:30:28,681 INFO L430 AbstractCegarLoop]: === Iteration 52 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-21 20:30:28,682 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-21 20:30:28,682 INFO L82 PathProgramCache]: Analyzing trace with hash 334241155, now seen corresponding path program 35 times [2021-05-21 20:30:28,682 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-21 20:30:28,682 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [314994527] [2021-05-21 20:30:28,682 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-21 20:30:28,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 20:30:28,723 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 7 proven. 9 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-21 20:30:28,723 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-21 20:30:28,723 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [314994527] [2021-05-21 20:30:28,724 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [314994527] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:28,724 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1217315840] [2021-05-21 20:30:28,724 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 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-21 20:30:28,747 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-05-21 20:30:28,747 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-21 20:30:28,748 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-21 20:30:28,748 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-21 20:30:28,790 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 8 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-21 20:30:28,791 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1217315840] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:28,791 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-21 20:30:28,791 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 8 [2021-05-21 20:30:28,791 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [8418778] [2021-05-21 20:30:28,791 INFO L462 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-21 20:30:28,791 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-21 20:30:28,791 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-21 20:30:28,792 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-05-21 20:30:28,792 INFO L87 Difference]: Start difference. First operand 5692 states and 16338 transitions. Second operand has 9 states, 9 states have (on average 3.888888888888889) internal successors, (35), 8 states have internal predecessors, (35), 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) [2021-05-21 20:30:28,894 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-21 20:30:28,894 INFO L93 Difference]: Finished difference Result 8010 states and 22671 transitions. [2021-05-21 20:30:28,895 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-21 20:30:28,895 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.888888888888889) internal successors, (35), 8 states have internal predecessors, (35), 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 26 [2021-05-21 20:30:28,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-21 20:30:28,904 INFO L225 Difference]: With dead ends: 8010 [2021-05-21 20:30:28,904 INFO L226 Difference]: Without dead ends: 7995 [2021-05-21 20:30:28,904 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 46.6ms TimeCoverageRelationStatistics Valid=39, Invalid=71, Unknown=0, NotChecked=0, Total=110 [2021-05-21 20:30:28,910 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7995 states. [2021-05-21 20:30:28,987 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7995 to 7490. [2021-05-21 20:30:28,992 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7490 states, 7489 states have (on average 2.8919748965148884) internal successors, (21658), 7489 states have internal predecessors, (21658), 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) [2021-05-21 20:30:29,003 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7490 states to 7490 states and 21658 transitions. [2021-05-21 20:30:29,004 INFO L78 Accepts]: Start accepts. Automaton has 7490 states and 21658 transitions. Word has length 26 [2021-05-21 20:30:29,004 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-21 20:30:29,004 INFO L482 AbstractCegarLoop]: Abstraction has 7490 states and 21658 transitions. [2021-05-21 20:30:29,004 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 3.888888888888889) internal successors, (35), 8 states have internal predecessors, (35), 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) [2021-05-21 20:30:29,004 INFO L276 IsEmpty]: Start isEmpty. Operand 7490 states and 21658 transitions. [2021-05-21 20:30:29,007 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-21 20:30:29,007 INFO L513 BasicCegarLoop]: Found error trace [2021-05-21 20:30:29,007 INFO L521 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-21 20:30:29,207 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable82 [2021-05-21 20:30:29,207 INFO L430 AbstractCegarLoop]: === Iteration 53 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-21 20:30:29,208 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-21 20:30:29,208 INFO L82 PathProgramCache]: Analyzing trace with hash -232684456, now seen corresponding path program 36 times [2021-05-21 20:30:29,208 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-21 20:30:29,208 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1092783361] [2021-05-21 20:30:29,208 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-21 20:30:29,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 20:30:29,245 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 8 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-21 20:30:29,245 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-21 20:30:29,245 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1092783361] [2021-05-21 20:30:29,245 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1092783361] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:29,245 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [291222716] [2021-05-21 20:30:29,245 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 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-21 20:30:29,266 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2021-05-21 20:30:29,266 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-21 20:30:29,266 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-21 20:30:29,267 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-21 20:30:29,326 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 8 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-21 20:30:29,327 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [291222716] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:29,327 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-21 20:30:29,327 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8] total 12 [2021-05-21 20:30:29,327 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1057312807] [2021-05-21 20:30:29,327 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-21 20:30:29,327 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-21 20:30:29,327 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-21 20:30:29,327 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=114, Unknown=0, NotChecked=0, Total=156 [2021-05-21 20:30:29,327 INFO L87 Difference]: Start difference. First operand 7490 states and 21658 transitions. Second operand has 13 states, 13 states have (on average 3.076923076923077) internal successors, (40), 12 states have internal predecessors, (40), 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) [2021-05-21 20:30:29,567 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-21 20:30:29,567 INFO L93 Difference]: Finished difference Result 8305 states and 23489 transitions. [2021-05-21 20:30:29,568 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-21 20:30:29,568 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 3.076923076923077) internal successors, (40), 12 states have internal predecessors, (40), 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 26 [2021-05-21 20:30:29,568 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-21 20:30:29,578 INFO L225 Difference]: With dead ends: 8305 [2021-05-21 20:30:29,578 INFO L226 Difference]: Without dead ends: 8305 [2021-05-21 20:30:29,578 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 72 ImplicationChecksByTransitivity, 123.6ms TimeCoverageRelationStatistics Valid=124, Invalid=296, Unknown=0, NotChecked=0, Total=420 [2021-05-21 20:30:29,584 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8305 states. [2021-05-21 20:30:29,694 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8305 to 5349. [2021-05-21 20:30:29,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5349 states, 5348 states have (on average 2.863874345549738) internal successors, (15316), 5348 states have internal predecessors, (15316), 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) [2021-05-21 20:30:29,705 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5349 states to 5349 states and 15316 transitions. [2021-05-21 20:30:29,705 INFO L78 Accepts]: Start accepts. Automaton has 5349 states and 15316 transitions. Word has length 26 [2021-05-21 20:30:29,705 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-21 20:30:29,705 INFO L482 AbstractCegarLoop]: Abstraction has 5349 states and 15316 transitions. [2021-05-21 20:30:29,705 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 3.076923076923077) internal successors, (40), 12 states have internal predecessors, (40), 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) [2021-05-21 20:30:29,705 INFO L276 IsEmpty]: Start isEmpty. Operand 5349 states and 15316 transitions. [2021-05-21 20:30:29,708 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-21 20:30:29,708 INFO L513 BasicCegarLoop]: Found error trace [2021-05-21 20:30:29,708 INFO L521 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-21 20:30:29,909 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable85,46 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-21 20:30:29,909 INFO L430 AbstractCegarLoop]: === Iteration 54 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-21 20:30:29,909 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-21 20:30:29,909 INFO L82 PathProgramCache]: Analyzing trace with hash 1947181405, now seen corresponding path program 37 times [2021-05-21 20:30:29,909 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-21 20:30:29,909 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [342226857] [2021-05-21 20:30:29,909 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-21 20:30:29,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 20:30:29,947 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 9 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-21 20:30:29,947 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-21 20:30:29,947 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [342226857] [2021-05-21 20:30:29,947 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [342226857] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:29,947 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1640552956] [2021-05-21 20:30:29,947 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 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-21 20:30:29,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 20:30:29,968 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-21 20:30:29,969 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-21 20:30:30,009 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 9 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-21 20:30:30,010 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1640552956] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:30,010 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-21 20:30:30,010 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 7 [2021-05-21 20:30:30,010 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [699578545] [2021-05-21 20:30:30,010 INFO L462 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-21 20:30:30,010 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-21 20:30:30,010 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-21 20:30:30,010 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-05-21 20:30:30,010 INFO L87 Difference]: Start difference. First operand 5349 states and 15316 transitions. Second operand has 8 states, 8 states have (on average 3.25) internal successors, (26), 7 states have internal predecessors, (26), 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) [2021-05-21 20:30:30,101 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-21 20:30:30,101 INFO L93 Difference]: Finished difference Result 5938 states and 16533 transitions. [2021-05-21 20:30:30,101 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-21 20:30:30,101 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.25) internal successors, (26), 7 states have internal predecessors, (26), 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 26 [2021-05-21 20:30:30,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-21 20:30:30,107 INFO L225 Difference]: With dead ends: 5938 [2021-05-21 20:30:30,107 INFO L226 Difference]: Without dead ends: 5915 [2021-05-21 20:30:30,107 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 46.3ms TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2021-05-21 20:30:30,111 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5915 states. [2021-05-21 20:30:30,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5915 to 5382. [2021-05-21 20:30:30,161 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5382 states, 5381 states have (on average 2.858018955584464) internal successors, (15379), 5381 states have internal predecessors, (15379), 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) [2021-05-21 20:30:30,169 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5382 states to 5382 states and 15379 transitions. [2021-05-21 20:30:30,169 INFO L78 Accepts]: Start accepts. Automaton has 5382 states and 15379 transitions. Word has length 26 [2021-05-21 20:30:30,169 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-21 20:30:30,169 INFO L482 AbstractCegarLoop]: Abstraction has 5382 states and 15379 transitions. [2021-05-21 20:30:30,169 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 3.25) internal successors, (26), 7 states have internal predecessors, (26), 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) [2021-05-21 20:30:30,169 INFO L276 IsEmpty]: Start isEmpty. Operand 5382 states and 15379 transitions. [2021-05-21 20:30:30,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-21 20:30:30,173 INFO L513 BasicCegarLoop]: Found error trace [2021-05-21 20:30:30,173 INFO L521 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-21 20:30:30,373 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable86 [2021-05-21 20:30:30,373 INFO L430 AbstractCegarLoop]: === Iteration 55 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-21 20:30:30,373 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-21 20:30:30,373 INFO L82 PathProgramCache]: Analyzing trace with hash -1692037720, now seen corresponding path program 5 times [2021-05-21 20:30:30,373 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-21 20:30:30,373 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [77161623] [2021-05-21 20:30:30,374 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-21 20:30:30,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 20:30:30,416 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 3 proven. 19 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-21 20:30:30,417 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-21 20:30:30,417 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [77161623] [2021-05-21 20:30:30,417 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [77161623] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 20:30:30,417 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [373352496] [2021-05-21 20:30:30,417 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 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-21 20:30:30,441 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-05-21 20:30:30,441 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-21 20:30:30,442 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-21 20:30:30,442 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-21 20:30:30,464 WARN L348 FreeRefinementEngine]: Global settings require throwing the following exception [2021-05-21 20:30:30,680 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable90,48 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-21 20:30:30,680 FATAL L? ?]: The Plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction has thrown an exception: java.lang.NullPointerException at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.EqualityInformation.getEqinfo(EqualityInformation.java:130) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.XnfDer.derSimple(XnfDer.java:308) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.XnfDer.tryToEliminate_EqInfoBased(XnfDer.java:138) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.XnfDer.tryToEliminate(XnfDer.java:101) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.PartialQuantifierElimination.elim(PartialQuantifierElimination.java:255) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.PartialQuantifierElimination.tryToEliminate(PartialQuantifierElimination.java:100) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.predicates.IterativePredicateTransformer$QuantifierEliminationPostprocessor.postprocess(IterativePredicateTransformer.java:246) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.predicates.IterativePredicateTransformer.applyPostprocessors(IterativePredicateTransformer.java:440) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.predicates.IterativePredicateTransformer.computeStrongestPostconditionSequence(IterativePredicateTransformer.java:201) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.singletracecheck.TraceCheckSpWp.computeInterpolantsUsingUnsatCore(TraceCheckSpWp.java:299) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.singletracecheck.TraceCheckSpWp.computeInterpolants(TraceCheckSpWp.java:185) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.singletracecheck.TraceCheckSpWp.(TraceCheckSpWp.java:163) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSpWp.construct(IpTcStrategyModuleSpWp.java:108) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSpWp.construct(IpTcStrategyModuleSpWp.java:1) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:297) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:190) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:180) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:439) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:374) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:69) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:63) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:371) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:307) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseConcurrentProgram(TraceAbstractionStarter.java:236) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:167) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-05-21 20:30:30,682 INFO L168 Benchmark]: Toolchain (without parser) took 23448.60 ms. Allocated memory was 415.2 MB in the beginning and 599.8 MB in the end (delta: 184.5 MB). Free memory was 394.8 MB in the beginning and 356.3 MB in the end (delta: 38.5 MB). Peak memory consumption was 225.9 MB. Max. memory is 16.0 GB. [2021-05-21 20:30:30,682 INFO L168 Benchmark]: Boogie PL CUP Parser took 0.13 ms. Allocated memory is still 415.2 MB. Free memory was 395.9 MB in the beginning and 395.9 MB in the end (delta: 65.6 kB). There was no memory consumed. Max. memory is 16.0 GB. [2021-05-21 20:30:30,686 INFO L168 Benchmark]: Boogie Procedure Inliner took 21.17 ms. Allocated memory is still 415.2 MB. Free memory was 394.7 MB in the beginning and 393.2 MB in the end (delta: 1.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.0 GB. [2021-05-21 20:30:30,686 INFO L168 Benchmark]: Boogie Preprocessor took 10.12 ms. Allocated memory is still 415.2 MB. Free memory was 393.2 MB in the beginning and 392.3 MB in the end (delta: 924.5 kB). Peak memory consumption was 2.1 MB. Max. memory is 16.0 GB. [2021-05-21 20:30:30,686 INFO L168 Benchmark]: RCFGBuilder took 171.00 ms. Allocated memory is still 415.2 MB. Free memory was 392.2 MB in the beginning and 381.1 MB in the end (delta: 11.1 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.0 GB. [2021-05-21 20:30:30,686 INFO L168 Benchmark]: TraceAbstraction took 23217.42 ms. Allocated memory was 415.2 MB in the beginning and 599.8 MB in the end (delta: 184.5 MB). Free memory was 380.7 MB in the beginning and 356.3 MB in the end (delta: 24.5 MB). Peak memory consumption was 211.2 MB. Max. memory is 16.0 GB. [2021-05-21 20:30:30,686 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * Boogie PL CUP Parser took 0.13 ms. Allocated memory is still 415.2 MB. Free memory was 395.9 MB in the beginning and 395.9 MB in the end (delta: 65.6 kB). There was no memory consumed. Max. memory is 16.0 GB. * Boogie Procedure Inliner took 21.17 ms. Allocated memory is still 415.2 MB. Free memory was 394.7 MB in the beginning and 393.2 MB in the end (delta: 1.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.0 GB. * Boogie Preprocessor took 10.12 ms. Allocated memory is still 415.2 MB. Free memory was 393.2 MB in the beginning and 392.3 MB in the end (delta: 924.5 kB). Peak memory consumption was 2.1 MB. Max. memory is 16.0 GB. * RCFGBuilder took 171.00 ms. Allocated memory is still 415.2 MB. Free memory was 392.2 MB in the beginning and 381.1 MB in the end (delta: 11.1 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.0 GB. * TraceAbstraction took 23217.42 ms. Allocated memory was 415.2 MB in the beginning and 599.8 MB in the end (delta: 184.5 MB). Free memory was 380.7 MB in the beginning and 356.3 MB in the end (delta: 24.5 MB). Peak memory consumption was 211.2 MB. Max. memory is 16.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - ExceptionOrErrorResult: NullPointerException: null de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: NullPointerException: null: de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.EqualityInformation.getEqinfo(EqualityInformation.java:130) RESULT: Ultimate could not prove your program: Toolchain returned no result. Received shutdown request...