/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/MirabelleConcurrentIncrement.bpl -------------------------------------------------------------------------------- This is Ultimate 0.2.1-7cd14b8b9f04096d8ddfd3d9cd8a4ac590fe5404-7cd14b8 [2021-03-10 20:31:39,462 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-03-10 20:31:39,464 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-03-10 20:31:39,497 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-03-10 20:31:39,556 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 [2021-03-10 20:31:39,598 INFO L113 SettingsManager]: Loading preferences was successful [2021-03-10 20:31:39,598 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-03-10 20:31:39,598 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-03-10 20:31:39,599 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-03-10 20:31:39,600 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-03-10 20:31:39,600 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-03-10 20:31:39,600 INFO L138 SettingsManager]: * Use SBE=true [2021-03-10 20:31:39,602 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-03-10 20:31:39,602 INFO L138 SettingsManager]: * sizeof long=4 [2021-03-10 20:31:39,602 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-03-10 20:31:39,603 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-03-10 20:31:39,603 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-03-10 20:31:39,603 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-03-10 20:31:39,603 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-03-10 20:31:39,603 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-03-10 20:31:39,603 INFO L138 SettingsManager]: * sizeof long double=12 [2021-03-10 20:31:39,604 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-03-10 20:31:39,604 INFO L138 SettingsManager]: * Use constant arrays=true [2021-03-10 20:31:39,604 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-03-10 20:31:39,604 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-03-10 20:31:39,604 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-03-10 20:31:39,604 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-03-10 20:31:39,604 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-03-10 20:31:39,605 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-03-10 20:31:39,605 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-03-10 20:31:39,605 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-03-10 20:31:39,605 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-03-10 20:31:39,605 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-03-10 20:31:39,606 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-03-10 20:31:39,606 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-03-10 20:31:39,606 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-03-10 20:31:39,606 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-03-10 20:31:39,920 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-03-10 20:31:39,940 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-03-10 20:31:39,943 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-03-10 20:31:39,943 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2021-03-10 20:31:39,944 INFO L275 PluginConnector]: Boogie PL CUP Parser initialized [2021-03-10 20:31:39,945 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/MirabelleConcurrentIncrement.bpl [2021-03-10 20:31:39,946 INFO L110 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/MirabelleConcurrentIncrement.bpl' [2021-03-10 20:31:39,992 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-03-10 20:31:39,998 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-03-10 20:31:40,000 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-03-10 20:31:40,000 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-03-10 20:31:40,000 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-03-10 20:31:40,011 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "MirabelleConcurrentIncrement.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 10.03 08:31:39" (1/1) ... [2021-03-10 20:31:40,017 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "MirabelleConcurrentIncrement.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 10.03 08:31:39" (1/1) ... [2021-03-10 20:31:40,022 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-03-10 20:31:40,027 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-03-10 20:31:40,027 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-03-10 20:31:40,027 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-03-10 20:31:40,034 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "MirabelleConcurrentIncrement.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 10.03 08:31:39" (1/1) ... [2021-03-10 20:31:40,034 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "MirabelleConcurrentIncrement.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 10.03 08:31:39" (1/1) ... [2021-03-10 20:31:40,034 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "MirabelleConcurrentIncrement.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 10.03 08:31:39" (1/1) ... [2021-03-10 20:31:40,034 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "MirabelleConcurrentIncrement.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 10.03 08:31:39" (1/1) ... [2021-03-10 20:31:40,036 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "MirabelleConcurrentIncrement.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 10.03 08:31:39" (1/1) ... [2021-03-10 20:31:40,039 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "MirabelleConcurrentIncrement.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 10.03 08:31:39" (1/1) ... [2021-03-10 20:31:40,039 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "MirabelleConcurrentIncrement.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 10.03 08:31:39" (1/1) ... [2021-03-10 20:31:40,040 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-03-10 20:31:40,041 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-03-10 20:31:40,041 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-03-10 20:31:40,041 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-03-10 20:31:40,042 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "MirabelleConcurrentIncrement.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 10.03 08:31:39" (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 [2021-03-10 20:31:40,094 INFO L124 BoogieDeclarations]: Specification and implementation of procedure ULTIMATE.start given in one single declaration [2021-03-10 20:31:40,095 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-03-10 20:31:40,095 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-03-10 20:31:40,095 INFO L124 BoogieDeclarations]: Specification and implementation of procedure T1 given in one single declaration [2021-03-10 20:31:40,095 INFO L130 BoogieDeclarations]: Found specification of procedure T1 [2021-03-10 20:31:40,095 INFO L138 BoogieDeclarations]: Found implementation of procedure T1 [2021-03-10 20:31:40,095 INFO L124 BoogieDeclarations]: Specification and implementation of procedure T2 given in one single declaration [2021-03-10 20:31:40,095 INFO L130 BoogieDeclarations]: Found specification of procedure T2 [2021-03-10 20:31:40,096 INFO L138 BoogieDeclarations]: Found implementation of procedure T2 [2021-03-10 20:31:40,097 WARN L209 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to SingleStatement [2021-03-10 20:31:40,246 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-03-10 20:31:40,247 INFO L299 CfgBuilder]: Removed 0 assume(true) statements. [2021-03-10 20:31:40,248 INFO L202 PluginConnector]: Adding new model MirabelleConcurrentIncrement.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 10.03 08:31:40 BoogieIcfgContainer [2021-03-10 20:31:40,248 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-03-10 20:31:40,249 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-03-10 20:31:40,250 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-03-10 20:31:40,252 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-03-10 20:31:40,252 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "MirabelleConcurrentIncrement.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 10.03 08:31:39" (1/2) ... [2021-03-10 20:31:40,253 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@40588512 and model type MirabelleConcurrentIncrement.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 10.03 08:31:40, skipping insertion in model container [2021-03-10 20:31:40,253 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "MirabelleConcurrentIncrement.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 10.03 08:31:40" (2/2) ... [2021-03-10 20:31:40,254 INFO L111 eAbstractionObserver]: Analyzing ICFG MirabelleConcurrentIncrement.bpl [2021-03-10 20:31:40,259 WARN L142 ceAbstractionStarter]: Switching off computation of Hoare annotation because input is a concurrent program [2021-03-10 20:31:40,259 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-03-10 20:31:40,262 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-03-10 20:31:40,263 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2021-03-10 20:31:40,290 INFO L149 ThreadInstanceAdder]: Constructed 4 joinOtherThreadTransitions. [2021-03-10 20:31:40,302 INFO L253 AbstractCegarLoop]: Starting to check reachability of 3 error locations. [2021-03-10 20:31:40,318 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-10 20:31:40,318 INFO L377 AbstractCegarLoop]: Hoare is true [2021-03-10 20:31:40,318 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-10 20:31:40,318 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-10 20:31:40,319 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-10 20:31:40,319 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-10 20:31:40,319 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-10 20:31:40,319 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-10 20:31:40,326 INFO L100 iNet2FiniteAutomaton]: Start petriNet2FiniteAutomaton. Operand has 23 places, 20 transitions, 62 flow [2021-03-10 20:31:40,342 INFO L122 iNet2FiniteAutomaton]: Finished petriNet2FiniteAutomaton. Result has 34 states, 32 states have (on average 1.96875) internal successors, (63), 33 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-10 20:31:40,344 INFO L276 IsEmpty]: Start isEmpty. Operand has 34 states, 32 states have (on average 1.96875) internal successors, (63), 33 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-10 20:31:40,347 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-03-10 20:31:40,347 INFO L511 BasicCegarLoop]: Found error trace [2021-03-10 20:31:40,348 INFO L519 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-10 20:31:40,348 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-10 20:31:40,351 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-10 20:31:40,352 INFO L82 PathProgramCache]: Analyzing trace with hash -1474916704, now seen corresponding path program 1 times [2021-03-10 20:31:40,357 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-10 20:31:40,358 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1837875639] [2021-03-10 20:31:40,358 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-10 20:31:40,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-10 20:31:40,450 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-10 20:31:40,451 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1837875639] [2021-03-10 20:31:40,451 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-10 20:31:40,452 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-10 20:31:40,452 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [939307072] [2021-03-10 20:31:40,455 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-10 20:31:40,455 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-10 20:31:40,465 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-10 20:31:40,466 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-10 20:31:40,468 INFO L87 Difference]: Start difference. First operand has 34 states, 32 states have (on average 1.96875) internal successors, (63), 33 states have internal predecessors, (63), 0 states have call successors, (0), 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, 2 states have (on average 5.0) internal successors, (10), 2 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-10 20:31:40,502 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-03-10 20:31:40,502 INFO L93 Difference]: Finished difference Result 63 states and 122 transitions. [2021-03-10 20:31:40,502 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-10 20:31:40,503 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 5.0) internal successors, (10), 2 states have internal predecessors, (10), 0 states have call successors, (0), 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 10 [2021-03-10 20:31:40,504 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-03-10 20:31:40,511 INFO L225 Difference]: With dead ends: 63 [2021-03-10 20:31:40,511 INFO L226 Difference]: Without dead ends: 52 [2021-03-10 20:31:40,512 INFO L775 BasicCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 7.6ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-10 20:31:40,524 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-03-10 20:31:40,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 42. [2021-03-10 20:31:40,538 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 41 states have (on average 1.975609756097561) internal successors, (81), 41 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-10 20:31:40,540 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 81 transitions. [2021-03-10 20:31:40,540 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 81 transitions. Word has length 10 [2021-03-10 20:31:40,541 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-03-10 20:31:40,541 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 81 transitions. [2021-03-10 20:31:40,541 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 2 states have (on average 5.0) internal successors, (10), 2 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-10 20:31:40,541 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 81 transitions. [2021-03-10 20:31:40,542 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-03-10 20:31:40,542 INFO L511 BasicCegarLoop]: Found error trace [2021-03-10 20:31:40,542 INFO L519 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-10 20:31:40,543 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-03-10 20:31:40,543 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-10 20:31:40,543 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-10 20:31:40,544 INFO L82 PathProgramCache]: Analyzing trace with hash -2103181474, now seen corresponding path program 1 times [2021-03-10 20:31:40,544 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-10 20:31:40,544 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1368818305] [2021-03-10 20:31:40,544 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-10 20:31:40,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-10 20:31:40,594 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-10 20:31:40,594 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1368818305] [2021-03-10 20:31:40,594 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1888093718] [2021-03-10 20:31:40,595 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-03-10 20:31:40,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-03-10 20:31:40,664 INFO L263 TraceCheckSpWp]: Trace formula consists of 20 conjuncts, 3 conjunts are in the unsatisfiable core [2021-03-10 20:31:40,679 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-03-10 20:31:40,759 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-10 20:31:40,760 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-03-10 20:31:40,760 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 3] total 5 [2021-03-10 20:31:40,761 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2112369152] [2021-03-10 20:31:40,761 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-03-10 20:31:40,761 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-10 20:31:40,762 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-03-10 20:31:40,762 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-03-10 20:31:40,763 INFO L87 Difference]: Start difference. First operand 42 states and 81 transitions. Second operand has 6 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 5 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) [2021-03-10 20:31:40,822 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-03-10 20:31:40,822 INFO L93 Difference]: Finished difference Result 78 states and 145 transitions. [2021-03-10 20:31:40,823 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-03-10 20:31:40,823 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 5 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 12 [2021-03-10 20:31:40,823 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-03-10 20:31:40,824 INFO L225 Difference]: With dead ends: 78 [2021-03-10 20:31:40,824 INFO L226 Difference]: Without dead ends: 78 [2021-03-10 20:31:40,825 INFO L775 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 10 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 39.2ms TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-03-10 20:31:40,826 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2021-03-10 20:31:40,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 43. [2021-03-10 20:31:40,833 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 42 states have (on average 2.0238095238095237) internal successors, (85), 42 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-10 20:31:40,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 85 transitions. [2021-03-10 20:31:40,835 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 85 transitions. Word has length 12 [2021-03-10 20:31:40,835 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-03-10 20:31:40,835 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 85 transitions. [2021-03-10 20:31:40,835 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 5 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) [2021-03-10 20:31:40,835 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 85 transitions. [2021-03-10 20:31:40,836 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-03-10 20:31:40,836 INFO L511 BasicCegarLoop]: Found error trace [2021-03-10 20:31:40,836 INFO L519 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-10 20:31:41,051 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-03-10 20:31:41,052 INFO L428 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-10 20:31:41,052 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-10 20:31:41,052 INFO L82 PathProgramCache]: Analyzing trace with hash -85551518, now seen corresponding path program 1 times [2021-03-10 20:31:41,053 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-10 20:31:41,053 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1213828489] [2021-03-10 20:31:41,053 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-10 20:31:41,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-10 20:31:41,113 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-10 20:31:41,113 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1213828489] [2021-03-10 20:31:41,113 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-10 20:31:41,114 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-03-10 20:31:41,114 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1050975731] [2021-03-10 20:31:41,114 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-03-10 20:31:41,114 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-10 20:31:41,115 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-03-10 20:31:41,115 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-03-10 20:31:41,116 INFO L87 Difference]: Start difference. First operand 43 states and 85 transitions. Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-10 20:31:41,158 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-03-10 20:31:41,158 INFO L93 Difference]: Finished difference Result 51 states and 93 transitions. [2021-03-10 20:31:41,159 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-03-10 20:31:41,159 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 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 12 [2021-03-10 20:31:41,160 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-03-10 20:31:41,160 INFO L225 Difference]: With dead ends: 51 [2021-03-10 20:31:41,160 INFO L226 Difference]: Without dead ends: 43 [2021-03-10 20:31:41,161 INFO L775 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 12.1ms TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-03-10 20:31:41,161 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-03-10 20:31:41,165 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 40. [2021-03-10 20:31:41,166 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 39 states have (on average 1.9743589743589745) internal successors, (77), 39 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-10 20:31:41,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 77 transitions. [2021-03-10 20:31:41,171 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 77 transitions. Word has length 12 [2021-03-10 20:31:41,171 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-03-10 20:31:41,171 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 77 transitions. [2021-03-10 20:31:41,171 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-10 20:31:41,171 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 77 transitions. [2021-03-10 20:31:41,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-03-10 20:31:41,173 INFO L511 BasicCegarLoop]: Found error trace [2021-03-10 20:31:41,173 INFO L519 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-10 20:31:41,174 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-03-10 20:31:41,174 INFO L428 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-10 20:31:41,174 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-10 20:31:41,174 INFO L82 PathProgramCache]: Analyzing trace with hash 1933209310, now seen corresponding path program 2 times [2021-03-10 20:31:41,174 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-10 20:31:41,175 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1067205780] [2021-03-10 20:31:41,175 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-10 20:31:41,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-10 20:31:41,232 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-10 20:31:41,233 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1067205780] [2021-03-10 20:31:41,233 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-10 20:31:41,233 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-03-10 20:31:41,233 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1802918191] [2021-03-10 20:31:41,233 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-03-10 20:31:41,233 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-10 20:31:41,234 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-03-10 20:31:41,234 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-03-10 20:31:41,234 INFO L87 Difference]: Start difference. First operand 40 states and 77 transitions. Second operand has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-10 20:31:41,274 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-03-10 20:31:41,274 INFO L93 Difference]: Finished difference Result 48 states and 93 transitions. [2021-03-10 20:31:41,274 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-03-10 20:31:41,275 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 0 states have call successors, (0), 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 12 [2021-03-10 20:31:41,275 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-03-10 20:31:41,279 INFO L225 Difference]: With dead ends: 48 [2021-03-10 20:31:41,279 INFO L226 Difference]: Without dead ends: 48 [2021-03-10 20:31:41,280 INFO L775 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 16.6ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-03-10 20:31:41,280 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-03-10 20:31:41,284 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 44. [2021-03-10 20:31:41,285 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 43 states have (on average 1.9767441860465116) internal successors, (85), 43 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-10 20:31:41,285 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 85 transitions. [2021-03-10 20:31:41,285 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 85 transitions. Word has length 12 [2021-03-10 20:31:41,286 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-03-10 20:31:41,286 INFO L480 AbstractCegarLoop]: Abstraction has 44 states and 85 transitions. [2021-03-10 20:31:41,286 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-10 20:31:41,286 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 85 transitions. [2021-03-10 20:31:41,286 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-03-10 20:31:41,287 INFO L511 BasicCegarLoop]: Found error trace [2021-03-10 20:31:41,287 INFO L519 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-10 20:31:41,287 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-03-10 20:31:41,287 INFO L428 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-10 20:31:41,287 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-10 20:31:41,288 INFO L82 PathProgramCache]: Analyzing trace with hash 1742393248, now seen corresponding path program 1 times [2021-03-10 20:31:41,288 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-10 20:31:41,288 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1413552495] [2021-03-10 20:31:41,288 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-10 20:31:41,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-10 20:31:41,363 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-10 20:31:41,364 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1413552495] [2021-03-10 20:31:41,364 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1444753778] [2021-03-10 20:31:41,364 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 [2021-03-10 20:31:41,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-10 20:31:41,388 INFO L263 TraceCheckSpWp]: Trace formula consists of 23 conjuncts, 7 conjunts are in the unsatisfiable core [2021-03-10 20:31:41,389 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-03-10 20:31:41,436 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-10 20:31:41,436 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-03-10 20:31:41,436 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [2, 2] total 2 [2021-03-10 20:31:41,437 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1442483619] [2021-03-10 20:31:41,437 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-03-10 20:31:41,437 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-10 20:31:41,438 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-03-10 20:31:41,438 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-03-10 20:31:41,438 INFO L87 Difference]: Start difference. First operand 44 states and 85 transitions. Second operand has 4 states, 3 states have (on average 4.666666666666667) 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) [2021-03-10 20:31:41,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-03-10 20:31:41,470 INFO L93 Difference]: Finished difference Result 107 states and 210 transitions. [2021-03-10 20:31:41,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-03-10 20:31:41,471 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 4.666666666666667) 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 [2021-03-10 20:31:41,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-03-10 20:31:41,473 INFO L225 Difference]: With dead ends: 107 [2021-03-10 20:31:41,473 INFO L226 Difference]: Without dead ends: 98 [2021-03-10 20:31:41,474 INFO L775 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 10 SyntacticMatches, 4 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 17.6ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-03-10 20:31:41,474 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2021-03-10 20:31:41,490 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 70. [2021-03-10 20:31:41,491 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 69 states have (on average 2.1159420289855073) internal successors, (146), 69 states have internal predecessors, (146), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-10 20:31:41,492 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 146 transitions. [2021-03-10 20:31:41,492 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 146 transitions. Word has length 14 [2021-03-10 20:31:41,492 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-03-10 20:31:41,492 INFO L480 AbstractCegarLoop]: Abstraction has 70 states and 146 transitions. [2021-03-10 20:31:41,492 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 3 states have (on average 4.666666666666667) 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) [2021-03-10 20:31:41,492 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 146 transitions. [2021-03-10 20:31:41,493 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-03-10 20:31:41,493 INFO L511 BasicCegarLoop]: Found error trace [2021-03-10 20:31:41,493 INFO L519 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-10 20:31:41,694 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-03-10 20:31:41,694 INFO L428 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-10 20:31:41,695 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-10 20:31:41,695 INFO L82 PathProgramCache]: Analyzing trace with hash 1371911392, now seen corresponding path program 2 times [2021-03-10 20:31:41,695 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-10 20:31:41,695 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [931555922] [2021-03-10 20:31:41,695 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-10 20:31:41,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-10 20:31:41,747 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-03-10 20:31:41,750 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [931555922] [2021-03-10 20:31:41,750 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-10 20:31:41,751 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-03-10 20:31:41,751 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1399963933] [2021-03-10 20:31:41,751 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-03-10 20:31:41,751 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-10 20:31:41,752 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-03-10 20:31:41,752 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-03-10 20:31:41,752 INFO L87 Difference]: Start difference. First operand 70 states and 146 transitions. Second operand has 4 states, 3 states have (on average 4.666666666666667) 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) [2021-03-10 20:31:41,790 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-03-10 20:31:41,791 INFO L93 Difference]: Finished difference Result 127 states and 259 transitions. [2021-03-10 20:31:41,791 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-03-10 20:31:41,791 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 4.666666666666667) 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 [2021-03-10 20:31:41,791 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-03-10 20:31:41,792 INFO L225 Difference]: With dead ends: 127 [2021-03-10 20:31:41,793 INFO L226 Difference]: Without dead ends: 118 [2021-03-10 20:31:41,793 INFO L775 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 1 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 10.4ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-03-10 20:31:41,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2021-03-10 20:31:41,805 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 90. [2021-03-10 20:31:41,806 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 89 states have (on average 2.191011235955056) internal successors, (195), 89 states have internal predecessors, (195), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-10 20:31:41,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 195 transitions. [2021-03-10 20:31:41,807 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 195 transitions. Word has length 14 [2021-03-10 20:31:41,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-03-10 20:31:41,808 INFO L480 AbstractCegarLoop]: Abstraction has 90 states and 195 transitions. [2021-03-10 20:31:41,808 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 3 states have (on average 4.666666666666667) 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) [2021-03-10 20:31:41,808 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 195 transitions. [2021-03-10 20:31:41,809 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-03-10 20:31:41,809 INFO L511 BasicCegarLoop]: Found error trace [2021-03-10 20:31:41,809 INFO L519 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-10 20:31:41,809 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-03-10 20:31:41,809 INFO L428 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-10 20:31:41,810 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-10 20:31:41,810 INFO L82 PathProgramCache]: Analyzing trace with hash 1755689310, now seen corresponding path program 3 times [2021-03-10 20:31:41,810 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-10 20:31:41,810 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1338192054] [2021-03-10 20:31:41,811 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-10 20:31:41,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-10 20:31:41,852 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-10 20:31:41,853 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1338192054] [2021-03-10 20:31:41,853 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1737024543] [2021-03-10 20:31:41,853 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-03-10 20:31:41,880 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-03-10 20:31:41,880 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-03-10 20:31:41,881 INFO L263 TraceCheckSpWp]: Trace formula consists of 26 conjuncts, 5 conjunts are in the unsatisfiable core [2021-03-10 20:31:41,883 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-03-10 20:31:41,935 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-10 20:31:41,935 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-03-10 20:31:41,935 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2021-03-10 20:31:41,936 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [16673368] [2021-03-10 20:31:41,936 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-03-10 20:31:41,936 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-10 20:31:41,936 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-03-10 20:31:41,937 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-03-10 20:31:41,937 INFO L87 Difference]: Start difference. First operand 90 states and 195 transitions. Second operand has 7 states, 7 states have (on average 3.0) internal successors, (21), 6 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-10 20:31:42,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-03-10 20:31:42,084 INFO L93 Difference]: Finished difference Result 176 states and 345 transitions. [2021-03-10 20:31:42,085 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-03-10 20:31:42,085 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.0) internal successors, (21), 6 states have internal predecessors, (21), 0 states have call successors, (0), 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 16 [2021-03-10 20:31:42,085 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-03-10 20:31:42,087 INFO L225 Difference]: With dead ends: 176 [2021-03-10 20:31:42,087 INFO L226 Difference]: Without dead ends: 176 [2021-03-10 20:31:42,087 INFO L775 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 59.6ms TimeCoverageRelationStatistics Valid=38, Invalid=72, Unknown=0, NotChecked=0, Total=110 [2021-03-10 20:31:42,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 176 states. [2021-03-10 20:31:42,105 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 176 to 92. [2021-03-10 20:31:42,106 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 91 states have (on average 2.208791208791209) internal successors, (201), 91 states have internal predecessors, (201), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-10 20:31:42,109 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 201 transitions. [2021-03-10 20:31:42,109 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 201 transitions. Word has length 16 [2021-03-10 20:31:42,109 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-03-10 20:31:42,109 INFO L480 AbstractCegarLoop]: Abstraction has 92 states and 201 transitions. [2021-03-10 20:31:42,110 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 3.0) internal successors, (21), 6 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-10 20:31:42,110 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 201 transitions. [2021-03-10 20:31:42,110 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-03-10 20:31:42,111 INFO L511 BasicCegarLoop]: Found error trace [2021-03-10 20:31:42,111 INFO L519 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-10 20:31:42,337 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-03-10 20:31:42,337 INFO L428 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-10 20:31:42,337 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-10 20:31:42,338 INFO L82 PathProgramCache]: Analyzing trace with hash -627140766, now seen corresponding path program 4 times [2021-03-10 20:31:42,338 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-10 20:31:42,338 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [355827582] [2021-03-10 20:31:42,338 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-10 20:31:42,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-10 20:31:42,370 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-10 20:31:42,370 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [355827582] [2021-03-10 20:31:42,370 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [260076936] [2021-03-10 20:31:42,370 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-03-10 20:31:42,390 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-03-10 20:31:42,390 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-03-10 20:31:42,391 INFO L263 TraceCheckSpWp]: Trace formula consists of 26 conjuncts, 5 conjunts are in the unsatisfiable core [2021-03-10 20:31:42,391 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-03-10 20:31:42,453 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-10 20:31:42,453 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-03-10 20:31:42,453 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2021-03-10 20:31:42,453 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1349141165] [2021-03-10 20:31:42,454 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-03-10 20:31:42,454 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-10 20:31:42,454 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-03-10 20:31:42,454 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-03-10 20:31:42,455 INFO L87 Difference]: Start difference. First operand 92 states and 201 transitions. Second operand has 7 states, 7 states have (on average 3.0) internal successors, (21), 6 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-10 20:31:42,531 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-03-10 20:31:42,532 INFO L93 Difference]: Finished difference Result 161 states and 325 transitions. [2021-03-10 20:31:42,532 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-03-10 20:31:42,532 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.0) internal successors, (21), 6 states have internal predecessors, (21), 0 states have call successors, (0), 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 16 [2021-03-10 20:31:42,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-03-10 20:31:42,533 INFO L225 Difference]: With dead ends: 161 [2021-03-10 20:31:42,533 INFO L226 Difference]: Without dead ends: 150 [2021-03-10 20:31:42,533 INFO L775 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 41.1ms TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2021-03-10 20:31:42,534 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2021-03-10 20:31:42,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 112. [2021-03-10 20:31:42,538 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 111 states have (on average 2.1981981981981984) internal successors, (244), 111 states have internal predecessors, (244), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-10 20:31:42,538 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 244 transitions. [2021-03-10 20:31:42,539 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 244 transitions. Word has length 16 [2021-03-10 20:31:42,539 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-03-10 20:31:42,539 INFO L480 AbstractCegarLoop]: Abstraction has 112 states and 244 transitions. [2021-03-10 20:31:42,539 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 3.0) internal successors, (21), 6 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-10 20:31:42,539 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 244 transitions. [2021-03-10 20:31:42,540 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-03-10 20:31:42,540 INFO L511 BasicCegarLoop]: Found error trace [2021-03-10 20:31:42,540 INFO L519 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-10 20:31:42,753 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-03-10 20:31:42,753 INFO L428 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-10 20:31:42,754 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-10 20:31:42,754 INFO L82 PathProgramCache]: Analyzing trace with hash 2026275120, now seen corresponding path program 5 times [2021-03-10 20:31:42,754 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-10 20:31:42,754 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [191979625] [2021-03-10 20:31:42,754 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-10 20:31:42,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-10 20:31:42,782 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-10 20:31:42,782 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [191979625] [2021-03-10 20:31:42,783 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2003814174] [2021-03-10 20:31:42,783 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-03-10 20:31:42,802 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-03-10 20:31:42,802 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-03-10 20:31:42,803 INFO L263 TraceCheckSpWp]: Trace formula consists of 26 conjuncts, 5 conjunts are in the unsatisfiable core [2021-03-10 20:31:42,804 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-03-10 20:31:42,850 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-10 20:31:42,850 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-03-10 20:31:42,851 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 5 [2021-03-10 20:31:42,851 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1495948210] [2021-03-10 20:31:42,854 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-03-10 20:31:42,854 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-10 20:31:42,855 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-03-10 20:31:42,856 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-03-10 20:31:42,856 INFO L87 Difference]: Start difference. First operand 112 states and 244 transitions. Second operand has 6 states, 6 states have (on average 3.5) internal successors, (21), 5 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-10 20:31:42,930 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-03-10 20:31:42,930 INFO L93 Difference]: Finished difference Result 154 states and 311 transitions. [2021-03-10 20:31:42,930 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-03-10 20:31:42,931 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.5) internal successors, (21), 5 states have internal predecessors, (21), 0 states have call successors, (0), 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 16 [2021-03-10 20:31:42,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-03-10 20:31:42,932 INFO L225 Difference]: With dead ends: 154 [2021-03-10 20:31:42,932 INFO L226 Difference]: Without dead ends: 154 [2021-03-10 20:31:42,932 INFO L775 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 35.0ms TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-03-10 20:31:42,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2021-03-10 20:31:42,938 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 110. [2021-03-10 20:31:42,938 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 110 states, 109 states have (on average 2.1743119266055047) internal successors, (237), 109 states have internal predecessors, (237), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-10 20:31:42,939 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 237 transitions. [2021-03-10 20:31:42,939 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 237 transitions. Word has length 16 [2021-03-10 20:31:42,939 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-03-10 20:31:42,944 INFO L480 AbstractCegarLoop]: Abstraction has 110 states and 237 transitions. [2021-03-10 20:31:42,944 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 3.5) internal successors, (21), 5 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-10 20:31:42,944 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 237 transitions. [2021-03-10 20:31:42,949 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-03-10 20:31:42,949 INFO L511 BasicCegarLoop]: Found error trace [2021-03-10 20:31:42,949 INFO L519 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-10 20:31:43,172 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-03-10 20:31:43,173 INFO L428 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-10 20:31:43,173 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-10 20:31:43,173 INFO L82 PathProgramCache]: Analyzing trace with hash 1537391890, now seen corresponding path program 6 times [2021-03-10 20:31:43,173 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-10 20:31:43,173 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [199082790] [2021-03-10 20:31:43,174 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-10 20:31:43,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-10 20:31:43,223 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-10 20:31:43,223 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [199082790] [2021-03-10 20:31:43,223 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [338898644] [2021-03-10 20:31:43,223 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-03-10 20:31:43,256 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-03-10 20:31:43,256 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-03-10 20:31:43,257 INFO L263 TraceCheckSpWp]: Trace formula consists of 26 conjuncts, 5 conjunts are in the unsatisfiable core [2021-03-10 20:31:43,257 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-03-10 20:31:43,303 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-10 20:31:43,303 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-03-10 20:31:43,303 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 5 [2021-03-10 20:31:43,305 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2078958714] [2021-03-10 20:31:43,305 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-03-10 20:31:43,305 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-10 20:31:43,306 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-03-10 20:31:43,306 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-03-10 20:31:43,306 INFO L87 Difference]: Start difference. First operand 110 states and 237 transitions. Second operand has 6 states, 6 states have (on average 3.5) internal successors, (21), 5 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-10 20:31:43,363 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-03-10 20:31:43,363 INFO L93 Difference]: Finished difference Result 144 states and 290 transitions. [2021-03-10 20:31:43,363 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-03-10 20:31:43,364 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.5) internal successors, (21), 5 states have internal predecessors, (21), 0 states have call successors, (0), 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 16 [2021-03-10 20:31:43,364 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-03-10 20:31:43,365 INFO L225 Difference]: With dead ends: 144 [2021-03-10 20:31:43,365 INFO L226 Difference]: Without dead ends: 141 [2021-03-10 20:31:43,365 INFO L775 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 44.1ms TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-03-10 20:31:43,366 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2021-03-10 20:31:43,368 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 113. [2021-03-10 20:31:43,369 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 113 states, 112 states have (on average 2.1517857142857144) internal successors, (241), 112 states have internal predecessors, (241), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-10 20:31:43,369 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 241 transitions. [2021-03-10 20:31:43,369 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 241 transitions. Word has length 16 [2021-03-10 20:31:43,370 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-03-10 20:31:43,370 INFO L480 AbstractCegarLoop]: Abstraction has 113 states and 241 transitions. [2021-03-10 20:31:43,370 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 3.5) internal successors, (21), 5 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-10 20:31:43,370 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 241 transitions. [2021-03-10 20:31:43,370 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-03-10 20:31:43,370 INFO L511 BasicCegarLoop]: Found error trace [2021-03-10 20:31:43,371 INFO L519 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-10 20:31:43,579 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-03-10 20:31:43,579 INFO L428 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-10 20:31:43,580 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-10 20:31:43,580 INFO L82 PathProgramCache]: Analyzing trace with hash 2099418526, now seen corresponding path program 7 times [2021-03-10 20:31:43,580 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-10 20:31:43,580 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1178285890] [2021-03-10 20:31:43,580 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-10 20:31:43,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-10 20:31:43,606 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-10 20:31:43,607 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1178285890] [2021-03-10 20:31:43,607 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [782720324] [2021-03-10 20:31:43,607 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-03-10 20:31:43,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-10 20:31:43,631 INFO L263 TraceCheckSpWp]: Trace formula consists of 26 conjuncts, 5 conjunts are in the unsatisfiable core [2021-03-10 20:31:43,632 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-03-10 20:31:43,682 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-03-10 20:31:43,683 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-03-10 20:31:43,683 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 5 [2021-03-10 20:31:43,683 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [393041251] [2021-03-10 20:31:43,685 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-03-10 20:31:43,685 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-10 20:31:43,685 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-03-10 20:31:43,685 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-03-10 20:31:43,686 INFO L87 Difference]: Start difference. First operand 113 states and 241 transitions. Second operand has 6 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 5 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) [2021-03-10 20:31:43,743 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-03-10 20:31:43,743 INFO L93 Difference]: Finished difference Result 195 states and 392 transitions. [2021-03-10 20:31:43,744 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-03-10 20:31:43,744 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 5 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 16 [2021-03-10 20:31:43,744 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-03-10 20:31:43,745 INFO L225 Difference]: With dead ends: 195 [2021-03-10 20:31:43,745 INFO L226 Difference]: Without dead ends: 195 [2021-03-10 20:31:43,746 INFO L775 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 31.5ms TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-03-10 20:31:43,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 195 states. [2021-03-10 20:31:43,750 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 195 to 122. [2021-03-10 20:31:43,750 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 121 states have (on average 2.1983471074380163) internal successors, (266), 121 states have internal predecessors, (266), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-10 20:31:43,751 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 266 transitions. [2021-03-10 20:31:43,751 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 266 transitions. Word has length 16 [2021-03-10 20:31:43,753 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-03-10 20:31:43,753 INFO L480 AbstractCegarLoop]: Abstraction has 122 states and 266 transitions. [2021-03-10 20:31:43,753 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 5 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) [2021-03-10 20:31:43,753 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 266 transitions. [2021-03-10 20:31:43,753 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-03-10 20:31:43,754 INFO L511 BasicCegarLoop]: Found error trace [2021-03-10 20:31:43,754 INFO L519 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-10 20:31:43,959 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-03-10 20:31:43,959 INFO L428 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-10 20:31:43,960 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-10 20:31:43,960 INFO L82 PathProgramCache]: Analyzing trace with hash -177918814, now seen corresponding path program 8 times [2021-03-10 20:31:43,960 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-10 20:31:43,960 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1600325536] [2021-03-10 20:31:43,960 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-10 20:31:43,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-10 20:31:43,988 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-10 20:31:43,989 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1600325536] [2021-03-10 20:31:43,989 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [800321979] [2021-03-10 20:31:43,989 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-03-10 20:31:44,017 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-03-10 20:31:44,017 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-03-10 20:31:44,017 INFO L263 TraceCheckSpWp]: Trace formula consists of 26 conjuncts, 5 conjunts are in the unsatisfiable core [2021-03-10 20:31:44,018 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-03-10 20:31:44,064 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-03-10 20:31:44,065 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-03-10 20:31:44,065 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 5 [2021-03-10 20:31:44,065 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [106391824] [2021-03-10 20:31:44,065 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-03-10 20:31:44,065 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-10 20:31:44,066 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-03-10 20:31:44,066 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-03-10 20:31:44,066 INFO L87 Difference]: Start difference. First operand 122 states and 266 transitions. Second operand has 6 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 5 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) [2021-03-10 20:31:44,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-03-10 20:31:44,133 INFO L93 Difference]: Finished difference Result 177 states and 366 transitions. [2021-03-10 20:31:44,134 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-03-10 20:31:44,134 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 5 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 16 [2021-03-10 20:31:44,134 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-03-10 20:31:44,135 INFO L225 Difference]: With dead ends: 177 [2021-03-10 20:31:44,135 INFO L226 Difference]: Without dead ends: 174 [2021-03-10 20:31:44,137 INFO L775 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 29.6ms TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-03-10 20:31:44,138 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 174 states. [2021-03-10 20:31:44,142 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 174 to 128. [2021-03-10 20:31:44,142 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 128 states, 127 states have (on average 2.251968503937008) internal successors, (286), 127 states have internal predecessors, (286), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-10 20:31:44,143 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 286 transitions. [2021-03-10 20:31:44,144 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 286 transitions. Word has length 16 [2021-03-10 20:31:44,144 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-03-10 20:31:44,144 INFO L480 AbstractCegarLoop]: Abstraction has 128 states and 286 transitions. [2021-03-10 20:31:44,144 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 5 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) [2021-03-10 20:31:44,144 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 286 transitions. [2021-03-10 20:31:44,144 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-03-10 20:31:44,144 INFO L511 BasicCegarLoop]: Found error trace [2021-03-10 20:31:44,144 INFO L519 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-10 20:31:44,363 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-03-10 20:31:44,363 INFO L428 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-10 20:31:44,364 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-10 20:31:44,364 INFO L82 PathProgramCache]: Analyzing trace with hash -523408140, now seen corresponding path program 9 times [2021-03-10 20:31:44,364 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-10 20:31:44,364 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [992104030] [2021-03-10 20:31:44,364 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-10 20:31:44,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-10 20:31:44,389 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-10 20:31:44,389 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [992104030] [2021-03-10 20:31:44,389 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1358155709] [2021-03-10 20:31:44,390 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-03-10 20:31:44,409 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-03-10 20:31:44,409 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-03-10 20:31:44,410 INFO L263 TraceCheckSpWp]: Trace formula consists of 26 conjuncts, 5 conjunts are in the unsatisfiable core [2021-03-10 20:31:44,411 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-03-10 20:31:44,445 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-03-10 20:31:44,446 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-03-10 20:31:44,446 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 5 [2021-03-10 20:31:44,446 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1519664748] [2021-03-10 20:31:44,446 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-03-10 20:31:44,446 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-10 20:31:44,447 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-03-10 20:31:44,447 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-03-10 20:31:44,447 INFO L87 Difference]: Start difference. First operand 128 states and 286 transitions. Second operand has 6 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 5 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) [2021-03-10 20:31:44,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-03-10 20:31:44,512 INFO L93 Difference]: Finished difference Result 184 states and 383 transitions. [2021-03-10 20:31:44,512 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-03-10 20:31:44,513 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 5 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 16 [2021-03-10 20:31:44,513 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-03-10 20:31:44,514 INFO L225 Difference]: With dead ends: 184 [2021-03-10 20:31:44,515 INFO L226 Difference]: Without dead ends: 184 [2021-03-10 20:31:44,515 INFO L775 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 36.7ms TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2021-03-10 20:31:44,515 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2021-03-10 20:31:44,521 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 130. [2021-03-10 20:31:44,521 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 130 states, 129 states have (on average 2.248062015503876) internal successors, (290), 129 states have internal predecessors, (290), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-10 20:31:44,522 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 290 transitions. [2021-03-10 20:31:44,522 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 290 transitions. Word has length 16 [2021-03-10 20:31:44,522 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-03-10 20:31:44,522 INFO L480 AbstractCegarLoop]: Abstraction has 130 states and 290 transitions. [2021-03-10 20:31:44,523 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 5 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) [2021-03-10 20:31:44,523 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 290 transitions. [2021-03-10 20:31:44,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-03-10 20:31:44,523 INFO L511 BasicCegarLoop]: Found error trace [2021-03-10 20:31:44,523 INFO L519 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-10 20:31:44,739 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-03-10 20:31:44,739 INFO L428 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-10 20:31:44,739 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-10 20:31:44,740 INFO L82 PathProgramCache]: Analyzing trace with hash -1012291370, now seen corresponding path program 10 times [2021-03-10 20:31:44,740 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-10 20:31:44,740 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [346744944] [2021-03-10 20:31:44,740 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-10 20:31:44,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-10 20:31:44,767 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-10 20:31:44,767 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [346744944] [2021-03-10 20:31:44,767 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [940827887] [2021-03-10 20:31:44,767 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-03-10 20:31:44,785 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-03-10 20:31:44,785 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-03-10 20:31:44,786 INFO L263 TraceCheckSpWp]: Trace formula consists of 26 conjuncts, 5 conjunts are in the unsatisfiable core [2021-03-10 20:31:44,786 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-03-10 20:31:44,818 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-03-10 20:31:44,818 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-03-10 20:31:44,818 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 5 [2021-03-10 20:31:44,819 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1027009118] [2021-03-10 20:31:44,819 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-03-10 20:31:44,819 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-10 20:31:44,819 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-03-10 20:31:44,819 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-03-10 20:31:44,820 INFO L87 Difference]: Start difference. First operand 130 states and 290 transitions. Second operand has 6 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 5 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) [2021-03-10 20:31:44,883 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-03-10 20:31:44,883 INFO L93 Difference]: Finished difference Result 192 states and 395 transitions. [2021-03-10 20:31:44,884 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-03-10 20:31:44,884 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 5 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 16 [2021-03-10 20:31:44,884 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-03-10 20:31:44,885 INFO L225 Difference]: With dead ends: 192 [2021-03-10 20:31:44,885 INFO L226 Difference]: Without dead ends: 189 [2021-03-10 20:31:44,885 INFO L775 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 21.0ms TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-03-10 20:31:44,886 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 189 states. [2021-03-10 20:31:44,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 189 to 130. [2021-03-10 20:31:44,890 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 130 states, 129 states have (on average 2.24031007751938) internal successors, (289), 129 states have internal predecessors, (289), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-10 20:31:44,890 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 289 transitions. [2021-03-10 20:31:44,891 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 289 transitions. Word has length 16 [2021-03-10 20:31:44,891 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-03-10 20:31:44,891 INFO L480 AbstractCegarLoop]: Abstraction has 130 states and 289 transitions. [2021-03-10 20:31:44,891 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 5 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) [2021-03-10 20:31:44,891 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 289 transitions. [2021-03-10 20:31:44,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-03-10 20:31:44,891 INFO L511 BasicCegarLoop]: Found error trace [2021-03-10 20:31:44,891 INFO L519 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-10 20:31:45,103 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-03-10 20:31:45,103 INFO L428 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-10 20:31:45,104 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-10 20:31:45,104 INFO L82 PathProgramCache]: Analyzing trace with hash -1596493520, now seen corresponding path program 11 times [2021-03-10 20:31:45,104 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-10 20:31:45,104 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [661260603] [2021-03-10 20:31:45,104 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-10 20:31:45,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-10 20:31:45,128 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-10 20:31:45,128 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [661260603] [2021-03-10 20:31:45,128 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [80573552] [2021-03-10 20:31:45,129 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 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 [2021-03-10 20:31:45,142 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-03-10 20:31:45,142 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-03-10 20:31:45,143 INFO L263 TraceCheckSpWp]: Trace formula consists of 26 conjuncts, 5 conjunts are in the unsatisfiable core [2021-03-10 20:31:45,143 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-03-10 20:31:45,185 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-10 20:31:45,185 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-03-10 20:31:45,185 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2021-03-10 20:31:45,186 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1286157080] [2021-03-10 20:31:45,186 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-03-10 20:31:45,186 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-10 20:31:45,186 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-03-10 20:31:45,186 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-03-10 20:31:45,187 INFO L87 Difference]: Start difference. First operand 130 states and 289 transitions. Second operand has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 6 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) [2021-03-10 20:31:45,259 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-03-10 20:31:45,259 INFO L93 Difference]: Finished difference Result 173 states and 357 transitions. [2021-03-10 20:31:45,260 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-03-10 20:31:45,260 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 6 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 16 [2021-03-10 20:31:45,260 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-03-10 20:31:45,261 INFO L225 Difference]: With dead ends: 173 [2021-03-10 20:31:45,261 INFO L226 Difference]: Without dead ends: 173 [2021-03-10 20:31:45,261 INFO L775 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 40.7ms TimeCoverageRelationStatistics Valid=38, Invalid=72, Unknown=0, NotChecked=0, Total=110 [2021-03-10 20:31:45,262 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2021-03-10 20:31:45,264 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 126. [2021-03-10 20:31:45,265 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 126 states, 125 states have (on average 2.208) internal successors, (276), 125 states have internal predecessors, (276), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-10 20:31:45,265 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 276 transitions. [2021-03-10 20:31:45,265 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 276 transitions. Word has length 16 [2021-03-10 20:31:45,265 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-03-10 20:31:45,265 INFO L480 AbstractCegarLoop]: Abstraction has 126 states and 276 transitions. [2021-03-10 20:31:45,266 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 6 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) [2021-03-10 20:31:45,266 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 276 transitions. [2021-03-10 20:31:45,266 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-03-10 20:31:45,266 INFO L511 BasicCegarLoop]: Found error trace [2021-03-10 20:31:45,266 INFO L519 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-10 20:31:45,479 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-03-10 20:31:45,479 INFO L428 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-10 20:31:45,480 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-10 20:31:45,480 INFO L82 PathProgramCache]: Analyzing trace with hash -474435792, now seen corresponding path program 12 times [2021-03-10 20:31:45,480 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-10 20:31:45,480 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1600592069] [2021-03-10 20:31:45,480 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-10 20:31:45,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-10 20:31:45,505 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-10 20:31:45,505 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1600592069] [2021-03-10 20:31:45,505 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [641765496] [2021-03-10 20:31:45,505 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 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 [2021-03-10 20:31:45,518 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-03-10 20:31:45,518 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-03-10 20:31:45,519 INFO L263 TraceCheckSpWp]: Trace formula consists of 26 conjuncts, 5 conjunts are in the unsatisfiable core [2021-03-10 20:31:45,519 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-03-10 20:31:45,556 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-10 20:31:45,557 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-03-10 20:31:45,557 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2021-03-10 20:31:45,557 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [4601203] [2021-03-10 20:31:45,557 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-03-10 20:31:45,557 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-10 20:31:45,558 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-03-10 20:31:45,558 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-03-10 20:31:45,558 INFO L87 Difference]: Start difference. First operand 126 states and 276 transitions. Second operand has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 6 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) [2021-03-10 20:31:45,622 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-03-10 20:31:45,623 INFO L93 Difference]: Finished difference Result 188 states and 378 transitions. [2021-03-10 20:31:45,623 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-03-10 20:31:45,623 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 6 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 16 [2021-03-10 20:31:45,623 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-03-10 20:31:45,624 INFO L225 Difference]: With dead ends: 188 [2021-03-10 20:31:45,624 INFO L226 Difference]: Without dead ends: 179 [2021-03-10 20:31:45,624 INFO L775 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 35.2ms TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2021-03-10 20:31:45,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2021-03-10 20:31:45,627 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 132. [2021-03-10 20:31:45,628 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 132 states, 131 states have (on average 2.1908396946564888) internal successors, (287), 131 states have internal predecessors, (287), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-10 20:31:45,628 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 287 transitions. [2021-03-10 20:31:45,629 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 287 transitions. Word has length 16 [2021-03-10 20:31:45,629 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-03-10 20:31:45,629 INFO L480 AbstractCegarLoop]: Abstraction has 132 states and 287 transitions. [2021-03-10 20:31:45,629 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 6 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) [2021-03-10 20:31:45,629 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 287 transitions. [2021-03-10 20:31:45,630 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-03-10 20:31:45,630 INFO L511 BasicCegarLoop]: Found error trace [2021-03-10 20:31:45,630 INFO L519 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-10 20:31:45,843 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-03-10 20:31:45,843 INFO L428 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-10 20:31:45,843 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-10 20:31:45,844 INFO L82 PathProgramCache]: Analyzing trace with hash -734527072, now seen corresponding path program 13 times [2021-03-10 20:31:45,844 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-10 20:31:45,844 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1696474970] [2021-03-10 20:31:45,844 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-10 20:31:45,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-10 20:31:45,894 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-10 20:31:45,894 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1696474970] [2021-03-10 20:31:45,894 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1192482845] [2021-03-10 20:31:45,894 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 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 [2021-03-10 20:31:45,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-10 20:31:45,908 INFO L263 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 11 conjunts are in the unsatisfiable core [2021-03-10 20:31:45,909 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-03-10 20:31:45,947 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-10 20:31:45,947 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-03-10 20:31:45,947 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3] total 3 [2021-03-10 20:31:45,947 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1977131423] [2021-03-10 20:31:45,947 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-03-10 20:31:45,948 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-10 20:31:45,948 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-03-10 20:31:45,948 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-03-10 20:31:45,948 INFO L87 Difference]: Start difference. First operand 132 states and 287 transitions. Second operand has 5 states, 4 states have (on average 4.5) internal successors, (18), 4 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-10 20:31:45,987 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-03-10 20:31:45,988 INFO L93 Difference]: Finished difference Result 239 states and 502 transitions. [2021-03-10 20:31:45,988 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-03-10 20:31:45,988 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 4.5) internal successors, (18), 4 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2021-03-10 20:31:45,988 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-03-10 20:31:45,989 INFO L225 Difference]: With dead ends: 239 [2021-03-10 20:31:45,989 INFO L226 Difference]: Without dead ends: 230 [2021-03-10 20:31:45,990 INFO L775 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 15 SyntacticMatches, 4 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 21.2ms TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-03-10 20:31:45,990 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 230 states. [2021-03-10 20:31:45,994 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 230 to 177. [2021-03-10 20:31:45,995 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 177 states, 176 states have (on average 2.2556818181818183) internal successors, (397), 176 states have internal predecessors, (397), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-10 20:31:45,995 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 177 states to 177 states and 397 transitions. [2021-03-10 20:31:45,995 INFO L78 Accepts]: Start accepts. Automaton has 177 states and 397 transitions. Word has length 18 [2021-03-10 20:31:45,997 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-03-10 20:31:45,997 INFO L480 AbstractCegarLoop]: Abstraction has 177 states and 397 transitions. [2021-03-10 20:31:45,997 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 4 states have (on average 4.5) internal successors, (18), 4 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-10 20:31:45,997 INFO L276 IsEmpty]: Start isEmpty. Operand 177 states and 397 transitions. [2021-03-10 20:31:45,999 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-03-10 20:31:46,000 INFO L511 BasicCegarLoop]: Found error trace [2021-03-10 20:31:46,000 INFO L519 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-10 20:31:46,211 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-03-10 20:31:46,211 INFO L428 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-10 20:31:46,211 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-10 20:31:46,212 INFO L82 PathProgramCache]: Analyzing trace with hash -655786976, now seen corresponding path program 14 times [2021-03-10 20:31:46,212 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-10 20:31:46,212 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [761804596] [2021-03-10 20:31:46,212 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-10 20:31:46,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-10 20:31:46,260 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-03-10 20:31:46,260 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [761804596] [2021-03-10 20:31:46,260 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1191432810] [2021-03-10 20:31:46,260 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 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 [2021-03-10 20:31:46,274 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-03-10 20:31:46,274 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-03-10 20:31:46,275 INFO L263 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 12 conjunts are in the unsatisfiable core [2021-03-10 20:31:46,275 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-03-10 20:31:46,409 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-10 20:31:46,409 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-03-10 20:31:46,410 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 6] total 7 [2021-03-10 20:31:46,410 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [868325739] [2021-03-10 20:31:46,410 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-03-10 20:31:46,410 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-10 20:31:46,413 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-03-10 20:31:46,413 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2021-03-10 20:31:46,413 INFO L87 Difference]: Start difference. First operand 177 states and 397 transitions. Second operand has 9 states, 8 states have (on average 3.125) internal successors, (25), 8 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) [2021-03-10 20:31:46,519 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-03-10 20:31:46,519 INFO L93 Difference]: Finished difference Result 343 states and 728 transitions. [2021-03-10 20:31:46,520 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-03-10 20:31:46,520 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 3.125) internal successors, (25), 8 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 18 [2021-03-10 20:31:46,520 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-03-10 20:31:46,521 INFO L225 Difference]: With dead ends: 343 [2021-03-10 20:31:46,522 INFO L226 Difference]: Without dead ends: 325 [2021-03-10 20:31:46,522 INFO L775 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 10 SyntacticMatches, 5 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 73.8ms TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2021-03-10 20:31:46,523 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 325 states. [2021-03-10 20:31:46,528 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 325 to 219. [2021-03-10 20:31:46,529 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 219 states, 218 states have (on average 2.311926605504587) internal successors, (504), 218 states have internal predecessors, (504), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-10 20:31:46,530 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 219 states to 219 states and 504 transitions. [2021-03-10 20:31:46,530 INFO L78 Accepts]: Start accepts. Automaton has 219 states and 504 transitions. Word has length 18 [2021-03-10 20:31:46,530 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-03-10 20:31:46,530 INFO L480 AbstractCegarLoop]: Abstraction has 219 states and 504 transitions. [2021-03-10 20:31:46,530 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 8 states have (on average 3.125) internal successors, (25), 8 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) [2021-03-10 20:31:46,530 INFO L276 IsEmpty]: Start isEmpty. Operand 219 states and 504 transitions. [2021-03-10 20:31:46,531 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-03-10 20:31:46,531 INFO L511 BasicCegarLoop]: Found error trace [2021-03-10 20:31:46,531 INFO L519 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-10 20:31:46,747 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-03-10 20:31:46,747 INFO L428 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-10 20:31:46,748 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-10 20:31:46,748 INFO L82 PathProgramCache]: Analyzing trace with hash -779503072, now seen corresponding path program 15 times [2021-03-10 20:31:46,748 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-10 20:31:46,748 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1627184449] [2021-03-10 20:31:46,748 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-10 20:31:46,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-10 20:31:46,784 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-03-10 20:31:46,784 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1627184449] [2021-03-10 20:31:46,784 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1867000639] [2021-03-10 20:31:46,784 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 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 [2021-03-10 20:31:46,807 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-03-10 20:31:46,808 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-03-10 20:31:46,808 INFO L263 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 11 conjunts are in the unsatisfiable core [2021-03-10 20:31:46,809 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-03-10 20:31:46,843 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-03-10 20:31:46,843 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-03-10 20:31:46,843 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3] total 3 [2021-03-10 20:31:46,843 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1563811653] [2021-03-10 20:31:46,843 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-03-10 20:31:46,843 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-10 20:31:46,844 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-03-10 20:31:46,844 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-03-10 20:31:46,844 INFO L87 Difference]: Start difference. First operand 219 states and 504 transitions. Second operand has 5 states, 4 states have (on average 4.5) internal successors, (18), 4 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-10 20:31:46,887 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-03-10 20:31:46,887 INFO L93 Difference]: Finished difference Result 322 states and 711 transitions. [2021-03-10 20:31:46,887 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-03-10 20:31:46,887 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 4.5) internal successors, (18), 4 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2021-03-10 20:31:46,888 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-03-10 20:31:46,889 INFO L225 Difference]: With dead ends: 322 [2021-03-10 20:31:46,889 INFO L226 Difference]: Without dead ends: 313 [2021-03-10 20:31:46,889 INFO L775 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 15 SyntacticMatches, 4 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 20.6ms TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-03-10 20:31:46,891 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 313 states. [2021-03-10 20:31:46,896 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 313 to 257. [2021-03-10 20:31:46,896 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 257 states, 256 states have (on average 2.3359375) internal successors, (598), 256 states have internal predecessors, (598), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-10 20:31:46,899 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 257 states to 257 states and 598 transitions. [2021-03-10 20:31:46,899 INFO L78 Accepts]: Start accepts. Automaton has 257 states and 598 transitions. Word has length 18 [2021-03-10 20:31:46,899 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-03-10 20:31:46,899 INFO L480 AbstractCegarLoop]: Abstraction has 257 states and 598 transitions. [2021-03-10 20:31:46,899 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 4 states have (on average 4.5) internal successors, (18), 4 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-10 20:31:46,899 INFO L276 IsEmpty]: Start isEmpty. Operand 257 states and 598 transitions. [2021-03-10 20:31:46,900 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-03-10 20:31:46,900 INFO L511 BasicCegarLoop]: Found error trace [2021-03-10 20:31:46,900 INFO L519 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-10 20:31:47,115 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-03-10 20:31:47,115 INFO L428 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-10 20:31:47,115 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-10 20:31:47,116 INFO L82 PathProgramCache]: Analyzing trace with hash -853552034, now seen corresponding path program 16 times [2021-03-10 20:31:47,116 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-10 20:31:47,116 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [632645407] [2021-03-10 20:31:47,116 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-10 20:31:47,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-10 20:31:47,162 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 1 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-10 20:31:47,163 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [632645407] [2021-03-10 20:31:47,163 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [701248884] [2021-03-10 20:31:47,163 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 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 [2021-03-10 20:31:47,184 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-03-10 20:31:47,184 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-03-10 20:31:47,185 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 7 conjunts are in the unsatisfiable core [2021-03-10 20:31:47,185 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-03-10 20:31:47,230 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-10 20:31:47,230 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-03-10 20:31:47,230 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2021-03-10 20:31:47,230 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1415460920] [2021-03-10 20:31:47,231 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-03-10 20:31:47,231 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-10 20:31:47,231 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-03-10 20:31:47,231 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2021-03-10 20:31:47,231 INFO L87 Difference]: Start difference. First operand 257 states and 598 transitions. Second operand has 9 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 8 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) [2021-03-10 20:31:47,350 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-03-10 20:31:47,350 INFO L93 Difference]: Finished difference Result 402 states and 849 transitions. [2021-03-10 20:31:47,351 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-03-10 20:31:47,351 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 8 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 [2021-03-10 20:31:47,351 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-03-10 20:31:47,352 INFO L225 Difference]: With dead ends: 402 [2021-03-10 20:31:47,353 INFO L226 Difference]: Without dead ends: 402 [2021-03-10 20:31:47,353 INFO L775 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 18 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 69.8ms TimeCoverageRelationStatistics Valid=68, Invalid=142, Unknown=0, NotChecked=0, Total=210 [2021-03-10 20:31:47,355 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 402 states. [2021-03-10 20:31:47,360 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 402 to 241. [2021-03-10 20:31:47,360 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 241 states, 240 states have (on average 2.325) internal successors, (558), 240 states have internal predecessors, (558), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-10 20:31:47,361 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 241 states to 241 states and 558 transitions. [2021-03-10 20:31:47,361 INFO L78 Accepts]: Start accepts. Automaton has 241 states and 558 transitions. Word has length 20 [2021-03-10 20:31:47,361 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-03-10 20:31:47,361 INFO L480 AbstractCegarLoop]: Abstraction has 241 states and 558 transitions. [2021-03-10 20:31:47,361 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 8 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) [2021-03-10 20:31:47,361 INFO L276 IsEmpty]: Start isEmpty. Operand 241 states and 558 transitions. [2021-03-10 20:31:47,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-03-10 20:31:47,362 INFO L511 BasicCegarLoop]: Found error trace [2021-03-10 20:31:47,362 INFO L519 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-10 20:31:47,585 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-03-10 20:31:47,585 INFO L428 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-10 20:31:47,586 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-10 20:31:47,586 INFO L82 PathProgramCache]: Analyzing trace with hash -1535686302, now seen corresponding path program 17 times [2021-03-10 20:31:47,586 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-10 20:31:47,586 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [475600735] [2021-03-10 20:31:47,586 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-10 20:31:47,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-10 20:31:47,648 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-10 20:31:47,648 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [475600735] [2021-03-10 20:31:47,649 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1962877778] [2021-03-10 20:31:47,649 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 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 [2021-03-10 20:31:47,665 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-03-10 20:31:47,666 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-03-10 20:31:47,667 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 7 conjunts are in the unsatisfiable core [2021-03-10 20:31:47,668 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-03-10 20:31:47,736 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-10 20:31:47,736 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-03-10 20:31:47,736 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2021-03-10 20:31:47,737 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1504159250] [2021-03-10 20:31:47,737 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-03-10 20:31:47,737 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-10 20:31:47,737 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-03-10 20:31:47,737 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-03-10 20:31:47,737 INFO L87 Difference]: Start difference. First operand 241 states and 558 transitions. Second operand has 9 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 8 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) [2021-03-10 20:31:47,842 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-03-10 20:31:47,842 INFO L93 Difference]: Finished difference Result 375 states and 801 transitions. [2021-03-10 20:31:47,842 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-03-10 20:31:47,842 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 8 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 [2021-03-10 20:31:47,843 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-03-10 20:31:47,845 INFO L225 Difference]: With dead ends: 375 [2021-03-10 20:31:47,845 INFO L226 Difference]: Without dead ends: 358 [2021-03-10 20:31:47,845 INFO L775 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 68.0ms TimeCoverageRelationStatistics Valid=64, Invalid=118, Unknown=0, NotChecked=0, Total=182 [2021-03-10 20:31:47,846 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 358 states. [2021-03-10 20:31:47,851 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 358 to 268. [2021-03-10 20:31:47,852 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 268 states, 267 states have (on average 2.3071161048689137) internal successors, (616), 267 states have internal predecessors, (616), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-10 20:31:47,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 268 states to 268 states and 616 transitions. [2021-03-10 20:31:47,853 INFO L78 Accepts]: Start accepts. Automaton has 268 states and 616 transitions. Word has length 20 [2021-03-10 20:31:47,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-03-10 20:31:47,853 INFO L480 AbstractCegarLoop]: Abstraction has 268 states and 616 transitions. [2021-03-10 20:31:47,853 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 8 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) [2021-03-10 20:31:47,853 INFO L276 IsEmpty]: Start isEmpty. Operand 268 states and 616 transitions. [2021-03-10 20:31:47,855 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-03-10 20:31:47,855 INFO L511 BasicCegarLoop]: Found error trace [2021-03-10 20:31:47,855 INFO L519 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-10 20:31:48,077 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2021-03-10 20:31:48,077 INFO L428 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-10 20:31:48,077 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-10 20:31:48,077 INFO L82 PathProgramCache]: Analyzing trace with hash 1142582700, now seen corresponding path program 18 times [2021-03-10 20:31:48,077 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-10 20:31:48,077 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [380662319] [2021-03-10 20:31:48,077 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-10 20:31:48,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-10 20:31:48,111 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-10 20:31:48,111 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [380662319] [2021-03-10 20:31:48,111 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1689411873] [2021-03-10 20:31:48,111 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 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 [2021-03-10 20:31:48,147 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-03-10 20:31:48,147 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-03-10 20:31:48,147 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 7 conjunts are in the unsatisfiable core [2021-03-10 20:31:48,148 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-03-10 20:31:48,212 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-10 20:31:48,212 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-03-10 20:31:48,213 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 6 [2021-03-10 20:31:48,213 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1249553288] [2021-03-10 20:31:48,213 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-03-10 20:31:48,213 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-10 20:31:48,213 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-03-10 20:31:48,214 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-03-10 20:31:48,214 INFO L87 Difference]: Start difference. First operand 268 states and 616 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) [2021-03-10 20:31:48,293 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-03-10 20:31:48,293 INFO L93 Difference]: Finished difference Result 358 states and 767 transitions. [2021-03-10 20:31:48,293 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-03-10 20:31:48,294 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 [2021-03-10 20:31:48,294 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-03-10 20:31:48,295 INFO L225 Difference]: With dead ends: 358 [2021-03-10 20:31:48,295 INFO L226 Difference]: Without dead ends: 358 [2021-03-10 20:31:48,295 INFO L775 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 47.3ms TimeCoverageRelationStatistics Valid=45, Invalid=65, Unknown=0, NotChecked=0, Total=110 [2021-03-10 20:31:48,296 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 358 states. [2021-03-10 20:31:48,301 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 358 to 250. [2021-03-10 20:31:48,301 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 250 states, 249 states have (on average 2.2610441767068274) internal successors, (563), 249 states have internal predecessors, (563), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-10 20:31:48,302 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 250 states to 250 states and 563 transitions. [2021-03-10 20:31:48,302 INFO L78 Accepts]: Start accepts. Automaton has 250 states and 563 transitions. Word has length 20 [2021-03-10 20:31:48,302 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-03-10 20:31:48,302 INFO L480 AbstractCegarLoop]: Abstraction has 250 states and 563 transitions. [2021-03-10 20:31:48,302 INFO L481 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) [2021-03-10 20:31:48,303 INFO L276 IsEmpty]: Start isEmpty. Operand 250 states and 563 transitions. [2021-03-10 20:31:48,304 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-03-10 20:31:48,304 INFO L511 BasicCegarLoop]: Found error trace [2021-03-10 20:31:48,304 INFO L519 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-10 20:31:48,519 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-03-10 20:31:48,519 INFO L428 AbstractCegarLoop]: === Iteration 23 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-10 20:31:48,519 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-10 20:31:48,520 INFO L82 PathProgramCache]: Analyzing trace with hash 653699470, now seen corresponding path program 19 times [2021-03-10 20:31:48,520 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-10 20:31:48,520 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [531254235] [2021-03-10 20:31:48,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-10 20:31:48,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-10 20:31:48,571 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-10 20:31:48,572 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [531254235] [2021-03-10 20:31:48,572 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [240567071] [2021-03-10 20:31:48,572 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 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 [2021-03-10 20:31:48,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-10 20:31:48,586 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 7 conjunts are in the unsatisfiable core [2021-03-10 20:31:48,587 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-03-10 20:31:48,624 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-10 20:31:48,624 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-03-10 20:31:48,624 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 6 [2021-03-10 20:31:48,624 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [843223334] [2021-03-10 20:31:48,624 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-03-10 20:31:48,624 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-10 20:31:48,624 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-03-10 20:31:48,625 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-03-10 20:31:48,625 INFO L87 Difference]: Start difference. First operand 250 states and 563 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) [2021-03-10 20:31:48,708 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-03-10 20:31:48,708 INFO L93 Difference]: Finished difference Result 305 states and 654 transitions. [2021-03-10 20:31:48,708 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-03-10 20:31:48,708 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 [2021-03-10 20:31:48,709 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-03-10 20:31:48,710 INFO L225 Difference]: With dead ends: 305 [2021-03-10 20:31:48,710 INFO L226 Difference]: Without dead ends: 302 [2021-03-10 20:31:48,710 INFO L775 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 50.3ms TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2021-03-10 20:31:48,711 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 302 states. [2021-03-10 20:31:48,715 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 302 to 250. [2021-03-10 20:31:48,715 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 250 states, 249 states have (on average 2.2570281124497993) internal successors, (562), 249 states have internal predecessors, (562), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-10 20:31:48,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 250 states to 250 states and 562 transitions. [2021-03-10 20:31:48,716 INFO L78 Accepts]: Start accepts. Automaton has 250 states and 562 transitions. Word has length 20 [2021-03-10 20:31:48,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-03-10 20:31:48,716 INFO L480 AbstractCegarLoop]: Abstraction has 250 states and 562 transitions. [2021-03-10 20:31:48,717 INFO L481 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) [2021-03-10 20:31:48,717 INFO L276 IsEmpty]: Start isEmpty. Operand 250 states and 562 transitions. [2021-03-10 20:31:48,717 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-03-10 20:31:48,717 INFO L511 BasicCegarLoop]: Found error trace [2021-03-10 20:31:48,717 INFO L519 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-10 20:31:48,918 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-03-10 20:31:48,918 INFO L428 AbstractCegarLoop]: === Iteration 24 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-10 20:31:48,918 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-10 20:31:48,919 INFO L82 PathProgramCache]: Analyzing trace with hash -898528034, now seen corresponding path program 20 times [2021-03-10 20:31:48,919 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-10 20:31:48,919 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1323875358] [2021-03-10 20:31:48,919 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-10 20:31:48,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-10 20:31:48,955 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-10 20:31:48,955 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1323875358] [2021-03-10 20:31:48,955 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1136927165] [2021-03-10 20:31:48,955 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 [2021-03-10 20:31:48,969 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-03-10 20:31:48,969 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-03-10 20:31:48,969 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 7 conjunts are in the unsatisfiable core [2021-03-10 20:31:48,970 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-03-10 20:31:49,021 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 1 proven. 11 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-03-10 20:31:49,021 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-03-10 20:31:49,021 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 6 [2021-03-10 20:31:49,022 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1543413474] [2021-03-10 20:31:49,022 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-03-10 20:31:49,022 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-10 20:31:49,023 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-03-10 20:31:49,023 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2021-03-10 20:31:49,023 INFO L87 Difference]: Start difference. First operand 250 states and 562 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) [2021-03-10 20:31:49,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-03-10 20:31:49,113 INFO L93 Difference]: Finished difference Result 417 states and 879 transitions. [2021-03-10 20:31:49,113 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-03-10 20:31:49,113 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 [2021-03-10 20:31:49,113 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-03-10 20:31:49,115 INFO L225 Difference]: With dead ends: 417 [2021-03-10 20:31:49,115 INFO L226 Difference]: Without dead ends: 417 [2021-03-10 20:31:49,115 INFO L775 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 47.6ms TimeCoverageRelationStatistics Valid=42, Invalid=68, Unknown=0, NotChecked=0, Total=110 [2021-03-10 20:31:49,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 417 states. [2021-03-10 20:31:49,121 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 417 to 268. [2021-03-10 20:31:49,122 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 268 states, 267 states have (on average 2.2883895131086143) internal successors, (611), 267 states have internal predecessors, (611), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-10 20:31:49,123 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 268 states to 268 states and 611 transitions. [2021-03-10 20:31:49,123 INFO L78 Accepts]: Start accepts. Automaton has 268 states and 611 transitions. Word has length 20 [2021-03-10 20:31:49,123 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-03-10 20:31:49,123 INFO L480 AbstractCegarLoop]: Abstraction has 268 states and 611 transitions. [2021-03-10 20:31:49,123 INFO L481 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) [2021-03-10 20:31:49,123 INFO L276 IsEmpty]: Start isEmpty. Operand 268 states and 611 transitions. [2021-03-10 20:31:49,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-03-10 20:31:49,124 INFO L511 BasicCegarLoop]: Found error trace [2021-03-10 20:31:49,124 INFO L519 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-10 20:31:49,343 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-03-10 20:31:49,343 INFO L428 AbstractCegarLoop]: === Iteration 25 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-10 20:31:49,343 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-10 20:31:49,344 INFO L82 PathProgramCache]: Analyzing trace with hash 1119101922, now seen corresponding path program 21 times [2021-03-10 20:31:49,344 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-10 20:31:49,344 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1582774223] [2021-03-10 20:31:49,344 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-10 20:31:49,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-10 20:31:49,376 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 8 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-10 20:31:49,376 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1582774223] [2021-03-10 20:31:49,376 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [929604153] [2021-03-10 20:31:49,376 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 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-03-10 20:31:49,394 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-03-10 20:31:49,394 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-03-10 20:31:49,394 INFO L263 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 7 conjunts are in the unsatisfiable core [2021-03-10 20:31:49,395 INFO L286 TraceCheckSpWp]: Computing forward predicates... Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-03-10 20:31:49,479 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-03-10 20:31:49,479 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-03-10 20:31:49,479 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 12 [2021-03-10 20:31:49,479 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [876907104] [2021-03-10 20:31:49,480 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-03-10 20:31:49,480 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-10 20:31:49,480 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-03-10 20:31:49,480 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2021-03-10 20:31:49,480 INFO L87 Difference]: Start difference. First operand 268 states and 611 transitions. Second operand has 12 states, 12 states have (on average 3.1666666666666665) internal successors, (38), 12 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) [2021-03-10 20:31:49,763 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-03-10 20:31:49,763 INFO L93 Difference]: Finished difference Result 393 states and 847 transitions. [2021-03-10 20:31:49,764 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-03-10 20:31:49,764 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.1666666666666665) internal successors, (38), 12 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 20 [2021-03-10 20:31:49,764 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-03-10 20:31:49,765 INFO L225 Difference]: With dead ends: 393 [2021-03-10 20:31:49,765 INFO L226 Difference]: Without dead ends: 313 [2021-03-10 20:31:49,766 INFO L775 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 126 ImplicationChecksByTransitivity, 222.4ms TimeCoverageRelationStatistics Valid=179, Invalid=523, Unknown=0, NotChecked=0, Total=702 [2021-03-10 20:31:49,766 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 313 states. [2021-03-10 20:31:49,770 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 313 to 237. [2021-03-10 20:31:49,776 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 237 states, 236 states have (on average 2.3220338983050848) internal successors, (548), 236 states have internal predecessors, (548), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-10 20:31:49,777 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 237 states to 237 states and 548 transitions. [2021-03-10 20:31:49,777 INFO L78 Accepts]: Start accepts. Automaton has 237 states and 548 transitions. Word has length 20 [2021-03-10 20:31:49,778 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-03-10 20:31:49,778 INFO L480 AbstractCegarLoop]: Abstraction has 237 states and 548 transitions. [2021-03-10 20:31:49,779 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 3.1666666666666665) internal successors, (38), 12 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) [2021-03-10 20:31:49,779 INFO L276 IsEmpty]: Start isEmpty. Operand 237 states and 548 transitions. [2021-03-10 20:31:49,780 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-03-10 20:31:49,780 INFO L511 BasicCegarLoop]: Found error trace [2021-03-10 20:31:49,780 INFO L519 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-10 20:31:49,989 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-03-10 20:31:49,990 INFO L428 AbstractCegarLoop]: === Iteration 26 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-10 20:31:49,990 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-10 20:31:49,990 INFO L82 PathProgramCache]: Analyzing trace with hash 284729366, now seen corresponding path program 22 times [2021-03-10 20:31:49,990 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-10 20:31:49,990 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [21665835] [2021-03-10 20:31:49,990 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-10 20:31:49,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-10 20:31:50,020 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-03-10 20:31:50,020 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [21665835] [2021-03-10 20:31:50,020 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [57123816] [2021-03-10 20:31:50,020 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 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-03-10 20:31:50,045 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-03-10 20:31:50,045 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-03-10 20:31:50,045 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 7 conjunts are in the unsatisfiable core [2021-03-10 20:31:50,048 INFO L286 TraceCheckSpWp]: Computing forward predicates... Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-03-10 20:31:50,085 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-03-10 20:31:50,085 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-03-10 20:31:50,085 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 6 [2021-03-10 20:31:50,086 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2146350167] [2021-03-10 20:31:50,086 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-03-10 20:31:50,086 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-10 20:31:50,087 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-03-10 20:31:50,087 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2021-03-10 20:31:50,087 INFO L87 Difference]: Start difference. First operand 237 states and 548 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) [2021-03-10 20:31:50,160 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-03-10 20:31:50,160 INFO L93 Difference]: Finished difference Result 329 states and 695 transitions. [2021-03-10 20:31:50,161 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-03-10 20:31:50,161 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 [2021-03-10 20:31:50,161 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-03-10 20:31:50,162 INFO L225 Difference]: With dead ends: 329 [2021-03-10 20:31:50,162 INFO L226 Difference]: Without dead ends: 323 [2021-03-10 20:31:50,162 INFO L775 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 33.1ms TimeCoverageRelationStatistics Valid=34, Invalid=56, Unknown=0, NotChecked=0, Total=90 [2021-03-10 20:31:50,163 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 323 states. [2021-03-10 20:31:50,166 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 323 to 211. [2021-03-10 20:31:50,167 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 211 states, 210 states have (on average 2.3047619047619046) internal successors, (484), 210 states have internal predecessors, (484), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-10 20:31:50,167 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 211 states to 211 states and 484 transitions. [2021-03-10 20:31:50,167 INFO L78 Accepts]: Start accepts. Automaton has 211 states and 484 transitions. Word has length 20 [2021-03-10 20:31:50,167 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-03-10 20:31:50,167 INFO L480 AbstractCegarLoop]: Abstraction has 211 states and 484 transitions. [2021-03-10 20:31:50,167 INFO L481 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) [2021-03-10 20:31:50,167 INFO L276 IsEmpty]: Start isEmpty. Operand 211 states and 484 transitions. [2021-03-10 20:31:50,168 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-03-10 20:31:50,168 INFO L511 BasicCegarLoop]: Found error trace [2021-03-10 20:31:50,168 INFO L519 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-10 20:31:50,391 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-03-10 20:31:50,391 INFO L428 AbstractCegarLoop]: === Iteration 27 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-10 20:31:50,391 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-10 20:31:50,391 INFO L82 PathProgramCache]: Analyzing trace with hash -299472784, now seen corresponding path program 23 times [2021-03-10 20:31:50,392 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-10 20:31:50,392 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [266947044] [2021-03-10 20:31:50,392 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-10 20:31:50,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-10 20:31:50,424 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-10 20:31:50,424 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [266947044] [2021-03-10 20:31:50,424 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [190739511] [2021-03-10 20:31:50,425 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 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 [2021-03-10 20:31:50,478 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-03-10 20:31:50,478 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-03-10 20:31:50,478 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 7 conjunts are in the unsatisfiable core [2021-03-10 20:31:50,481 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-03-10 20:31:50,523 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-10 20:31:50,524 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-03-10 20:31:50,524 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 7 [2021-03-10 20:31:50,524 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1898488297] [2021-03-10 20:31:50,524 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-03-10 20:31:50,524 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-10 20:31:50,525 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-03-10 20:31:50,525 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-03-10 20:31:50,525 INFO L87 Difference]: Start difference. First operand 211 states and 484 transitions. Second operand has 8 states, 8 states have (on average 3.125) internal successors, (25), 7 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) [2021-03-10 20:31:50,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-03-10 20:31:50,619 INFO L93 Difference]: Finished difference Result 303 states and 631 transitions. [2021-03-10 20:31:50,620 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-03-10 20:31:50,620 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.125) internal successors, (25), 7 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 [2021-03-10 20:31:50,620 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-03-10 20:31:50,621 INFO L225 Difference]: With dead ends: 303 [2021-03-10 20:31:50,621 INFO L226 Difference]: Without dead ends: 303 [2021-03-10 20:31:50,621 INFO L775 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 54.4ms TimeCoverageRelationStatistics Valid=55, Invalid=101, Unknown=0, NotChecked=0, Total=156 [2021-03-10 20:31:50,624 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 303 states. [2021-03-10 20:31:50,627 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 303 to 186. [2021-03-10 20:31:50,628 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 186 states, 185 states have (on average 2.2324324324324323) internal successors, (413), 185 states have internal predecessors, (413), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-10 20:31:50,628 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 186 states to 186 states and 413 transitions. [2021-03-10 20:31:50,628 INFO L78 Accepts]: Start accepts. Automaton has 186 states and 413 transitions. Word has length 20 [2021-03-10 20:31:50,628 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-03-10 20:31:50,628 INFO L480 AbstractCegarLoop]: Abstraction has 186 states and 413 transitions. [2021-03-10 20:31:50,628 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 3.125) internal successors, (25), 7 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) [2021-03-10 20:31:50,629 INFO L276 IsEmpty]: Start isEmpty. Operand 186 states and 413 transitions. [2021-03-10 20:31:50,629 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-03-10 20:31:50,629 INFO L511 BasicCegarLoop]: Found error trace [2021-03-10 20:31:50,629 INFO L519 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-10 20:31:50,843 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-03-10 20:31:50,843 INFO L428 AbstractCegarLoop]: === Iteration 28 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-10 20:31:50,844 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-10 20:31:50,844 INFO L82 PathProgramCache]: Analyzing trace with hash 822584944, now seen corresponding path program 24 times [2021-03-10 20:31:50,844 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-10 20:31:50,844 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1299767364] [2021-03-10 20:31:50,844 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-10 20:31:50,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-10 20:31:50,884 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-10 20:31:50,885 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1299767364] [2021-03-10 20:31:50,885 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1758097999] [2021-03-10 20:31:50,885 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 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-03-10 20:31:50,915 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 6 check-sat command(s) [2021-03-10 20:31:50,915 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-03-10 20:31:50,916 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 7 conjunts are in the unsatisfiable core Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-03-10 20:31:50,917 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-03-10 20:31:50,949 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-10 20:31:50,949 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-03-10 20:31:50,949 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 7 [2021-03-10 20:31:50,949 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1589999517] [2021-03-10 20:31:50,949 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-03-10 20:31:50,949 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-10 20:31:50,950 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-03-10 20:31:50,950 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-03-10 20:31:50,950 INFO L87 Difference]: Start difference. First operand 186 states and 413 transitions. Second operand has 8 states, 8 states have (on average 3.125) internal successors, (25), 7 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) [2021-03-10 20:31:51,032 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-03-10 20:31:51,033 INFO L93 Difference]: Finished difference Result 257 states and 522 transitions. [2021-03-10 20:31:51,033 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-03-10 20:31:51,033 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.125) internal successors, (25), 7 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 [2021-03-10 20:31:51,033 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-03-10 20:31:51,034 INFO L225 Difference]: With dead ends: 257 [2021-03-10 20:31:51,034 INFO L226 Difference]: Without dead ends: 248 [2021-03-10 20:31:51,035 INFO L775 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 46.1ms TimeCoverageRelationStatistics Valid=47, Invalid=85, Unknown=0, NotChecked=0, Total=132 [2021-03-10 20:31:51,035 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 248 states. [2021-03-10 20:31:51,038 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 248 to 189. [2021-03-10 20:31:51,038 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 189 states, 188 states have (on average 2.228723404255319) internal successors, (419), 188 states have internal predecessors, (419), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-10 20:31:51,039 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 189 states to 189 states and 419 transitions. [2021-03-10 20:31:51,039 INFO L78 Accepts]: Start accepts. Automaton has 189 states and 419 transitions. Word has length 20 [2021-03-10 20:31:51,039 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-03-10 20:31:51,039 INFO L480 AbstractCegarLoop]: Abstraction has 189 states and 419 transitions. [2021-03-10 20:31:51,039 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 3.125) internal successors, (25), 7 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) [2021-03-10 20:31:51,039 INFO L276 IsEmpty]: Start isEmpty. Operand 189 states and 419 transitions. [2021-03-10 20:31:51,039 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-03-10 20:31:51,039 INFO L511 BasicCegarLoop]: Found error trace [2021-03-10 20:31:51,039 INFO L519 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-10 20:31:51,259 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27,25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-03-10 20:31:51,259 INFO L428 AbstractCegarLoop]: === Iteration 29 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-10 20:31:51,259 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-10 20:31:51,259 INFO L82 PathProgramCache]: Analyzing trace with hash 618096624, now seen corresponding path program 25 times [2021-03-10 20:31:51,260 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-10 20:31:51,260 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1556765023] [2021-03-10 20:31:51,260 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-10 20:31:51,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-10 20:31:51,294 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-10 20:31:51,294 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1556765023] [2021-03-10 20:31:51,294 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1939694261] [2021-03-10 20:31:51,294 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 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 [2021-03-10 20:31:51,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-10 20:31:51,317 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 7 conjunts are in the unsatisfiable core [2021-03-10 20:31:51,318 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-03-10 20:31:51,355 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-03-10 20:31:51,355 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-03-10 20:31:51,356 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 7 [2021-03-10 20:31:51,356 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1217540616] [2021-03-10 20:31:51,356 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-03-10 20:31:51,356 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-10 20:31:51,356 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-03-10 20:31:51,356 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-03-10 20:31:51,356 INFO L87 Difference]: Start difference. First operand 189 states and 419 transitions. Second operand has 8 states, 8 states have (on average 3.125) internal successors, (25), 7 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) [2021-03-10 20:31:51,447 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-03-10 20:31:51,447 INFO L93 Difference]: Finished difference Result 233 states and 480 transitions. [2021-03-10 20:31:51,447 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-03-10 20:31:51,447 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.125) internal successors, (25), 7 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 [2021-03-10 20:31:51,447 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-03-10 20:31:51,448 INFO L225 Difference]: With dead ends: 233 [2021-03-10 20:31:51,449 INFO L226 Difference]: Without dead ends: 224 [2021-03-10 20:31:51,449 INFO L775 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 54.5ms TimeCoverageRelationStatistics Valid=55, Invalid=101, Unknown=0, NotChecked=0, Total=156 [2021-03-10 20:31:51,449 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 224 states. [2021-03-10 20:31:51,452 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 224 to 188. [2021-03-10 20:31:51,452 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 188 states, 187 states have (on average 2.2032085561497325) internal successors, (412), 187 states have internal predecessors, (412), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-10 20:31:51,453 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 188 states to 188 states and 412 transitions. [2021-03-10 20:31:51,453 INFO L78 Accepts]: Start accepts. Automaton has 188 states and 412 transitions. Word has length 20 [2021-03-10 20:31:51,453 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-03-10 20:31:51,453 INFO L480 AbstractCegarLoop]: Abstraction has 188 states and 412 transitions. [2021-03-10 20:31:51,453 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 3.125) internal successors, (25), 7 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) [2021-03-10 20:31:51,453 INFO L276 IsEmpty]: Start isEmpty. Operand 188 states and 412 transitions. [2021-03-10 20:31:51,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-03-10 20:31:51,454 INFO L511 BasicCegarLoop]: Found error trace [2021-03-10 20:31:51,454 INFO L519 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-10 20:31:51,676 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-03-10 20:31:51,676 INFO L428 AbstractCegarLoop]: === Iteration 30 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-10 20:31:51,677 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-10 20:31:51,677 INFO L82 PathProgramCache]: Analyzing trace with hash 469387998, now seen corresponding path program 26 times [2021-03-10 20:31:51,677 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-10 20:31:51,677 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1396744964] [2021-03-10 20:31:51,677 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-10 20:31:51,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-10 20:31:51,713 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-10 20:31:51,713 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1396744964] [2021-03-10 20:31:51,713 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [519605293] [2021-03-10 20:31:51,713 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 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-03-10 20:31:51,740 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-03-10 20:31:51,740 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-03-10 20:31:51,741 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 7 conjunts are in the unsatisfiable core [2021-03-10 20:31:51,741 INFO L286 TraceCheckSpWp]: Computing forward predicates... Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-03-10 20:31:51,782 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-03-10 20:31:51,783 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-03-10 20:31:51,783 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 6 [2021-03-10 20:31:51,784 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1334249179] [2021-03-10 20:31:51,784 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-03-10 20:31:51,784 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-10 20:31:51,784 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-03-10 20:31:51,784 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-03-10 20:31:51,784 INFO L87 Difference]: Start difference. First operand 188 states and 412 transitions. Second operand has 7 states, 7 states have (on average 3.7142857142857144) internal successors, (26), 6 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) [2021-03-10 20:31:51,852 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-03-10 20:31:51,852 INFO L93 Difference]: Finished difference Result 289 states and 591 transitions. [2021-03-10 20:31:51,852 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-03-10 20:31:51,852 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.7142857142857144) internal successors, (26), 6 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 20 [2021-03-10 20:31:51,852 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-03-10 20:31:51,853 INFO L225 Difference]: With dead ends: 289 [2021-03-10 20:31:51,853 INFO L226 Difference]: Without dead ends: 286 [2021-03-10 20:31:51,854 INFO L775 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 39.9ms TimeCoverageRelationStatistics Valid=45, Invalid=65, Unknown=0, NotChecked=0, Total=110 [2021-03-10 20:31:51,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 286 states. [2021-03-10 20:31:51,858 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 286 to 201. [2021-03-10 20:31:51,858 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 201 states, 200 states have (on average 2.24) internal successors, (448), 200 states have internal predecessors, (448), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-10 20:31:51,858 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201 states to 201 states and 448 transitions. [2021-03-10 20:31:51,859 INFO L78 Accepts]: Start accepts. Automaton has 201 states and 448 transitions. Word has length 20 [2021-03-10 20:31:51,859 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-03-10 20:31:51,859 INFO L480 AbstractCegarLoop]: Abstraction has 201 states and 448 transitions. [2021-03-10 20:31:51,859 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 3.7142857142857144) internal successors, (26), 6 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) [2021-03-10 20:31:51,859 INFO L276 IsEmpty]: Start isEmpty. Operand 201 states and 448 transitions. [2021-03-10 20:31:51,859 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-03-10 20:31:51,859 INFO L511 BasicCegarLoop]: Found error trace [2021-03-10 20:31:51,859 INFO L519 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-10 20:31:52,082 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,27 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-03-10 20:31:52,082 INFO L428 AbstractCegarLoop]: === Iteration 31 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-10 20:31:52,082 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-10 20:31:52,082 INFO L82 PathProgramCache]: Analyzing trace with hash 2141528628, now seen corresponding path program 27 times [2021-03-10 20:31:52,082 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-10 20:31:52,082 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1435668716] [2021-03-10 20:31:52,082 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-10 20:31:52,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-10 20:31:52,109 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-10 20:31:52,109 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1435668716] [2021-03-10 20:31:52,109 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1038290402] [2021-03-10 20:31:52,109 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 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 [2021-03-10 20:31:52,125 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-03-10 20:31:52,125 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-03-10 20:31:52,126 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 7 conjunts are in the unsatisfiable core [2021-03-10 20:31:52,126 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-03-10 20:31:52,160 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 8 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-03-10 20:31:52,160 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-03-10 20:31:52,160 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 6 [2021-03-10 20:31:52,160 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [483664262] [2021-03-10 20:31:52,161 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-03-10 20:31:52,161 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-10 20:31:52,161 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-03-10 20:31:52,161 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-03-10 20:31:52,161 INFO L87 Difference]: Start difference. First operand 201 states and 448 transitions. Second operand has 7 states, 7 states have (on average 3.7142857142857144) internal successors, (26), 6 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) [2021-03-10 20:31:52,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-03-10 20:31:52,234 INFO L93 Difference]: Finished difference Result 308 states and 651 transitions. [2021-03-10 20:31:52,234 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-03-10 20:31:52,234 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.7142857142857144) internal successors, (26), 6 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 20 [2021-03-10 20:31:52,234 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-03-10 20:31:52,235 INFO L225 Difference]: With dead ends: 308 [2021-03-10 20:31:52,235 INFO L226 Difference]: Without dead ends: 308 [2021-03-10 20:31:52,236 INFO L775 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 38.5ms TimeCoverageRelationStatistics Valid=39, Invalid=71, Unknown=0, NotChecked=0, Total=110 [2021-03-10 20:31:52,236 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 308 states. [2021-03-10 20:31:52,240 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 308 to 218. [2021-03-10 20:31:52,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 218 states, 217 states have (on average 2.2764976958525347) internal successors, (494), 217 states have internal predecessors, (494), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-10 20:31:52,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 218 states to 218 states and 494 transitions. [2021-03-10 20:31:52,241 INFO L78 Accepts]: Start accepts. Automaton has 218 states and 494 transitions. Word has length 20 [2021-03-10 20:31:52,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-03-10 20:31:52,241 INFO L480 AbstractCegarLoop]: Abstraction has 218 states and 494 transitions. [2021-03-10 20:31:52,241 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 3.7142857142857144) internal successors, (26), 6 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) [2021-03-10 20:31:52,241 INFO L276 IsEmpty]: Start isEmpty. Operand 218 states and 494 transitions. [2021-03-10 20:31:52,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-03-10 20:31:52,242 INFO L511 BasicCegarLoop]: Found error trace [2021-03-10 20:31:52,242 INFO L519 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-10 20:31:52,459 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2021-03-10 20:31:52,459 INFO L428 AbstractCegarLoop]: === Iteration 32 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-10 20:31:52,459 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-10 20:31:52,459 INFO L82 PathProgramCache]: Analyzing trace with hash 1652645398, now seen corresponding path program 28 times [2021-03-10 20:31:52,460 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-10 20:31:52,460 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1456340685] [2021-03-10 20:31:52,460 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-10 20:31:52,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-10 20:31:52,482 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-10 20:31:52,483 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1456340685] [2021-03-10 20:31:52,483 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [445546963] [2021-03-10 20:31:52,483 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 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 [2021-03-10 20:31:52,496 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-03-10 20:31:52,496 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-03-10 20:31:52,497 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 7 conjunts are in the unsatisfiable core [2021-03-10 20:31:52,497 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-03-10 20:31:52,527 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-03-10 20:31:52,527 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-03-10 20:31:52,527 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 6 [2021-03-10 20:31:52,528 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1531221488] [2021-03-10 20:31:52,528 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-03-10 20:31:52,528 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-10 20:31:52,528 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-03-10 20:31:52,528 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-03-10 20:31:52,528 INFO L87 Difference]: Start difference. First operand 218 states and 494 transitions. Second operand has 7 states, 7 states have (on average 3.7142857142857144) internal successors, (26), 6 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) [2021-03-10 20:31:52,592 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-03-10 20:31:52,592 INFO L93 Difference]: Finished difference Result 302 states and 629 transitions. [2021-03-10 20:31:52,592 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-03-10 20:31:52,592 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.7142857142857144) internal successors, (26), 6 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 20 [2021-03-10 20:31:52,592 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-03-10 20:31:52,594 INFO L225 Difference]: With dead ends: 302 [2021-03-10 20:31:52,594 INFO L226 Difference]: Without dead ends: 299 [2021-03-10 20:31:52,595 INFO L775 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 30.7ms TimeCoverageRelationStatistics Valid=35, Invalid=55, Unknown=0, NotChecked=0, Total=90 [2021-03-10 20:31:52,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 299 states. [2021-03-10 20:31:52,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 299 to 218. [2021-03-10 20:31:52,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 218 states, 217 states have (on average 2.271889400921659) internal successors, (493), 217 states have internal predecessors, (493), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-10 20:31:52,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 218 states to 218 states and 493 transitions. [2021-03-10 20:31:52,600 INFO L78 Accepts]: Start accepts. Automaton has 218 states and 493 transitions. Word has length 20 [2021-03-10 20:31:52,600 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-03-10 20:31:52,600 INFO L480 AbstractCegarLoop]: Abstraction has 218 states and 493 transitions. [2021-03-10 20:31:52,600 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 3.7142857142857144) internal successors, (26), 6 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) [2021-03-10 20:31:52,600 INFO L276 IsEmpty]: Start isEmpty. Operand 218 states and 493 transitions. [2021-03-10 20:31:52,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-03-10 20:31:52,601 INFO L511 BasicCegarLoop]: Found error trace [2021-03-10 20:31:52,601 INFO L519 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-10 20:31:52,823 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,29 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-03-10 20:31:52,823 INFO L428 AbstractCegarLoop]: === Iteration 33 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-10 20:31:52,823 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-10 20:31:52,824 INFO L82 PathProgramCache]: Analyzing trace with hash 1068443248, now seen corresponding path program 29 times [2021-03-10 20:31:52,824 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-10 20:31:52,824 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [11771181] [2021-03-10 20:31:52,824 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-10 20:31:52,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-10 20:31:52,848 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-03-10 20:31:52,849 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [11771181] [2021-03-10 20:31:52,849 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1133249762] [2021-03-10 20:31:52,849 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 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 [2021-03-10 20:31:52,862 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-03-10 20:31:52,862 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-03-10 20:31:52,863 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 7 conjunts are in the unsatisfiable core [2021-03-10 20:31:52,863 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-03-10 20:31:52,926 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-03-10 20:31:52,926 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-03-10 20:31:52,926 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2021-03-10 20:31:52,926 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1800796207] [2021-03-10 20:31:52,926 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-03-10 20:31:52,927 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-10 20:31:52,927 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-03-10 20:31:52,927 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2021-03-10 20:31:52,927 INFO L87 Difference]: Start difference. First operand 218 states and 493 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) [2021-03-10 20:31:53,042 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-03-10 20:31:53,042 INFO L93 Difference]: Finished difference Result 318 states and 670 transitions. [2021-03-10 20:31:53,042 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-03-10 20:31:53,043 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 20 [2021-03-10 20:31:53,043 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-03-10 20:31:53,044 INFO L225 Difference]: With dead ends: 318 [2021-03-10 20:31:53,044 INFO L226 Difference]: Without dead ends: 318 [2021-03-10 20:31:53,044 INFO L775 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 60.0ms TimeCoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2021-03-10 20:31:53,045 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 318 states. [2021-03-10 20:31:53,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 318 to 222. [2021-03-10 20:31:53,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 222 states, 221 states have (on average 2.266968325791855) internal successors, (501), 221 states have internal predecessors, (501), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-10 20:31:53,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 222 states to 222 states and 501 transitions. [2021-03-10 20:31:53,049 INFO L78 Accepts]: Start accepts. Automaton has 222 states and 501 transitions. Word has length 20 [2021-03-10 20:31:53,049 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-03-10 20:31:53,049 INFO L480 AbstractCegarLoop]: Abstraction has 222 states and 501 transitions. [2021-03-10 20:31:53,049 INFO L481 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) [2021-03-10 20:31:53,049 INFO L276 IsEmpty]: Start isEmpty. Operand 222 states and 501 transitions. [2021-03-10 20:31:53,049 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-03-10 20:31:53,050 INFO L511 BasicCegarLoop]: Found error trace [2021-03-10 20:31:53,050 INFO L519 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-10 20:31:53,271 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2021-03-10 20:31:53,272 INFO L428 AbstractCegarLoop]: === Iteration 34 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-10 20:31:53,272 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-10 20:31:53,272 INFO L82 PathProgramCache]: Analyzing trace with hash -2104466320, now seen corresponding path program 30 times [2021-03-10 20:31:53,272 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-10 20:31:53,272 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [419976514] [2021-03-10 20:31:53,272 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-10 20:31:53,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-10 20:31:53,301 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-03-10 20:31:53,302 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [419976514] [2021-03-10 20:31:53,302 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2084690345] [2021-03-10 20:31:53,302 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 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 [2021-03-10 20:31:53,322 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-03-10 20:31:53,322 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-03-10 20:31:53,323 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 7 conjunts are in the unsatisfiable core [2021-03-10 20:31:53,323 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-03-10 20:31:53,360 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-03-10 20:31:53,361 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-03-10 20:31:53,361 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2021-03-10 20:31:53,361 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [164197162] [2021-03-10 20:31:53,361 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-03-10 20:31:53,361 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-10 20:31:53,362 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-03-10 20:31:53,362 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2021-03-10 20:31:53,362 INFO L87 Difference]: Start difference. First operand 222 states and 501 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) [2021-03-10 20:31:53,449 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-03-10 20:31:53,449 INFO L93 Difference]: Finished difference Result 327 states and 677 transitions. [2021-03-10 20:31:53,449 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-03-10 20:31:53,449 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 20 [2021-03-10 20:31:53,449 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-03-10 20:31:53,451 INFO L225 Difference]: With dead ends: 327 [2021-03-10 20:31:53,451 INFO L226 Difference]: Without dead ends: 318 [2021-03-10 20:31:53,451 INFO L775 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 49.4ms TimeCoverageRelationStatistics Valid=48, Invalid=84, Unknown=0, NotChecked=0, Total=132 [2021-03-10 20:31:53,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 318 states. [2021-03-10 20:31:53,454 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 318 to 222. [2021-03-10 20:31:53,455 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 222 states, 221 states have (on average 2.257918552036199) internal successors, (499), 221 states have internal predecessors, (499), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-10 20:31:53,455 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 222 states to 222 states and 499 transitions. [2021-03-10 20:31:53,455 INFO L78 Accepts]: Start accepts. Automaton has 222 states and 499 transitions. Word has length 20 [2021-03-10 20:31:53,455 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-03-10 20:31:53,455 INFO L480 AbstractCegarLoop]: Abstraction has 222 states and 499 transitions. [2021-03-10 20:31:53,455 INFO L481 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) [2021-03-10 20:31:53,456 INFO L276 IsEmpty]: Start isEmpty. Operand 222 states and 499 transitions. [2021-03-10 20:31:53,456 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-03-10 20:31:53,456 INFO L511 BasicCegarLoop]: Found error trace [2021-03-10 20:31:53,456 INFO L519 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-10 20:31:53,669 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,31 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-03-10 20:31:53,669 INFO L428 AbstractCegarLoop]: === Iteration 35 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-10 20:31:53,670 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-10 20:31:53,670 INFO L82 PathProgramCache]: Analyzing trace with hash -1481240012, now seen corresponding path program 31 times [2021-03-10 20:31:53,670 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-10 20:31:53,670 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1544512127] [2021-03-10 20:31:53,670 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-10 20:31:53,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-10 20:31:53,707 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-10 20:31:53,707 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1544512127] [2021-03-10 20:31:53,708 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [595313273] [2021-03-10 20:31:53,708 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 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 [2021-03-10 20:31:53,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-10 20:31:53,720 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 7 conjunts are in the unsatisfiable core [2021-03-10 20:31:53,720 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-03-10 20:31:53,759 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-10 20:31:53,759 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-03-10 20:31:53,759 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2021-03-10 20:31:53,759 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [146189944] [2021-03-10 20:31:53,759 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-03-10 20:31:53,759 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-10 20:31:53,760 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-03-10 20:31:53,760 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2021-03-10 20:31:53,760 INFO L87 Difference]: Start difference. First operand 222 states and 499 transitions. Second operand has 9 states, 9 states have (on average 2.888888888888889) internal successors, (26), 8 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) [2021-03-10 20:31:53,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-03-10 20:31:53,869 INFO L93 Difference]: Finished difference Result 300 states and 625 transitions. [2021-03-10 20:31:53,870 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-03-10 20:31:53,870 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.888888888888889) internal successors, (26), 8 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 20 [2021-03-10 20:31:53,870 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-03-10 20:31:53,871 INFO L225 Difference]: With dead ends: 300 [2021-03-10 20:31:53,871 INFO L226 Difference]: Without dead ends: 297 [2021-03-10 20:31:53,871 INFO L775 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 18 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 68.8ms TimeCoverageRelationStatistics Valid=68, Invalid=142, Unknown=0, NotChecked=0, Total=210 [2021-03-10 20:31:53,871 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 297 states. [2021-03-10 20:31:53,874 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 297 to 206. [2021-03-10 20:31:53,874 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 206 states, 205 states have (on average 2.2536585365853656) internal successors, (462), 205 states have internal predecessors, (462), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-10 20:31:53,875 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 206 states to 206 states and 462 transitions. [2021-03-10 20:31:53,875 INFO L78 Accepts]: Start accepts. Automaton has 206 states and 462 transitions. Word has length 20 [2021-03-10 20:31:53,875 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-03-10 20:31:53,875 INFO L480 AbstractCegarLoop]: Abstraction has 206 states and 462 transitions. [2021-03-10 20:31:53,875 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.888888888888889) internal successors, (26), 8 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) [2021-03-10 20:31:53,875 INFO L276 IsEmpty]: Start isEmpty. Operand 206 states and 462 transitions. [2021-03-10 20:31:53,876 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-03-10 20:31:53,876 INFO L511 BasicCegarLoop]: Found error trace [2021-03-10 20:31:53,876 INFO L519 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-10 20:31:54,087 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-03-10 20:31:54,087 INFO L428 AbstractCegarLoop]: === Iteration 36 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-10 20:31:54,087 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-10 20:31:54,087 INFO L82 PathProgramCache]: Analyzing trace with hash -33586060, now seen corresponding path program 32 times [2021-03-10 20:31:54,088 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-10 20:31:54,088 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [601718092] [2021-03-10 20:31:54,088 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-10 20:31:54,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-10 20:31:54,122 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-10 20:31:54,122 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [601718092] [2021-03-10 20:31:54,123 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1294768329] [2021-03-10 20:31:54,123 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 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-03-10 20:31:54,135 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-03-10 20:31:54,135 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-03-10 20:31:54,135 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 7 conjunts are in the unsatisfiable core [2021-03-10 20:31:54,135 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-03-10 20:31:54,177 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-10 20:31:54,177 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-03-10 20:31:54,177 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2021-03-10 20:31:54,177 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1970176361] [2021-03-10 20:31:54,177 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-03-10 20:31:54,178 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-10 20:31:54,178 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-03-10 20:31:54,178 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-03-10 20:31:54,178 INFO L87 Difference]: Start difference. First operand 206 states and 462 transitions. Second operand has 9 states, 9 states have (on average 2.888888888888889) internal successors, (26), 8 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) [2021-03-10 20:31:54,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-03-10 20:31:54,269 INFO L93 Difference]: Finished difference Result 296 states and 607 transitions. [2021-03-10 20:31:54,269 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-03-10 20:31:54,269 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.888888888888889) internal successors, (26), 8 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 20 [2021-03-10 20:31:54,269 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-03-10 20:31:54,270 INFO L225 Difference]: With dead ends: 296 [2021-03-10 20:31:54,270 INFO L226 Difference]: Without dead ends: 281 [2021-03-10 20:31:54,270 INFO L775 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 55.7ms TimeCoverageRelationStatistics Valid=64, Invalid=118, Unknown=0, NotChecked=0, Total=182 [2021-03-10 20:31:54,271 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 281 states. [2021-03-10 20:31:54,273 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 281 to 212. [2021-03-10 20:31:54,274 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 212 states, 211 states have (on average 2.241706161137441) internal successors, (473), 211 states have internal predecessors, (473), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-10 20:31:54,274 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 212 states to 212 states and 473 transitions. [2021-03-10 20:31:54,274 INFO L78 Accepts]: Start accepts. Automaton has 212 states and 473 transitions. Word has length 20 [2021-03-10 20:31:54,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-03-10 20:31:54,274 INFO L480 AbstractCegarLoop]: Abstraction has 212 states and 473 transitions. [2021-03-10 20:31:54,274 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.888888888888889) internal successors, (26), 8 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) [2021-03-10 20:31:54,274 INFO L276 IsEmpty]: Start isEmpty. Operand 212 states and 473 transitions. [2021-03-10 20:31:54,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-03-10 20:31:54,275 INFO L511 BasicCegarLoop]: Found error trace [2021-03-10 20:31:54,275 INFO L519 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-10 20:31:54,491 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2021-03-10 20:31:54,491 INFO L428 AbstractCegarLoop]: === Iteration 37 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-10 20:31:54,491 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-10 20:31:54,492 INFO L82 PathProgramCache]: Analyzing trace with hash -1571256086, now seen corresponding path program 33 times [2021-03-10 20:31:54,492 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-10 20:31:54,492 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [485414181] [2021-03-10 20:31:54,492 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-10 20:31:54,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-10 20:31:54,528 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-03-10 20:31:54,528 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [485414181] [2021-03-10 20:31:54,528 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [906695522] [2021-03-10 20:31:54,528 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 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 [2021-03-10 20:31:54,558 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-03-10 20:31:54,558 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-03-10 20:31:54,559 INFO L263 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 7 conjunts are in the unsatisfiable core [2021-03-10 20:31:54,559 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-03-10 20:31:54,645 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-03-10 20:31:54,645 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-03-10 20:31:54,646 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [4] total 10 [2021-03-10 20:31:54,646 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1236519318] [2021-03-10 20:31:54,646 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-03-10 20:31:54,646 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-10 20:31:54,646 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-03-10 20:31:54,646 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-03-10 20:31:54,646 INFO L87 Difference]: Start difference. First operand 212 states and 473 transitions. Second operand has 8 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 8 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-10 20:31:54,724 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-03-10 20:31:54,724 INFO L93 Difference]: Finished difference Result 239 states and 520 transitions. [2021-03-10 20:31:54,724 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-03-10 20:31:54,724 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 8 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-03-10 20:31:54,724 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-03-10 20:31:54,725 INFO L225 Difference]: With dead ends: 239 [2021-03-10 20:31:54,725 INFO L226 Difference]: Without dead ends: 224 [2021-03-10 20:31:54,725 INFO L775 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 19 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 105.2ms TimeCoverageRelationStatistics Valid=42, Invalid=140, Unknown=0, NotChecked=0, Total=182 [2021-03-10 20:31:54,726 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 224 states. [2021-03-10 20:31:54,728 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 224 to 209. [2021-03-10 20:31:54,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 209 states, 208 states have (on average 2.1923076923076925) internal successors, (456), 208 states have internal predecessors, (456), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-10 20:31:54,729 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 209 states to 209 states and 456 transitions. [2021-03-10 20:31:54,729 INFO L78 Accepts]: Start accepts. Automaton has 209 states and 456 transitions. Word has length 22 [2021-03-10 20:31:54,729 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-03-10 20:31:54,729 INFO L480 AbstractCegarLoop]: Abstraction has 209 states and 456 transitions. [2021-03-10 20:31:54,729 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 8 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-10 20:31:54,729 INFO L276 IsEmpty]: Start isEmpty. Operand 209 states and 456 transitions. [2021-03-10 20:31:54,730 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-03-10 20:31:54,730 INFO L511 BasicCegarLoop]: Found error trace [2021-03-10 20:31:54,730 INFO L519 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-10 20:31:54,951 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-03-10 20:31:54,951 INFO L428 AbstractCegarLoop]: === Iteration 38 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-10 20:31:54,951 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-10 20:31:54,951 INFO L82 PathProgramCache]: Analyzing trace with hash 792994068, now seen corresponding path program 34 times [2021-03-10 20:31:54,952 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-10 20:31:54,952 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [225698108] [2021-03-10 20:31:54,952 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-10 20:31:54,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-10 20:31:54,991 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-03-10 20:31:54,991 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [225698108] [2021-03-10 20:31:54,991 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1249724563] [2021-03-10 20:31:54,991 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 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-03-10 20:31:55,017 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-03-10 20:31:55,017 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-03-10 20:31:55,018 INFO L263 TraceCheckSpWp]: Trace formula consists of 35 conjuncts, 15 conjunts are in the unsatisfiable core [2021-03-10 20:31:55,018 INFO L286 TraceCheckSpWp]: Computing forward predicates... Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-03-10 20:31:55,056 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-03-10 20:31:55,057 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-03-10 20:31:55,057 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 4 [2021-03-10 20:31:55,057 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2044372522] [2021-03-10 20:31:55,059 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-03-10 20:31:55,059 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-10 20:31:55,059 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-03-10 20:31:55,059 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-03-10 20:31:55,059 INFO L87 Difference]: Start difference. First operand 209 states and 456 transitions. Second operand has 6 states, 5 states have (on average 4.4) internal successors, (22), 5 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) [2021-03-10 20:31:55,121 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-03-10 20:31:55,121 INFO L93 Difference]: Finished difference Result 322 states and 668 transitions. [2021-03-10 20:31:55,121 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-03-10 20:31:55,121 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 4.4) internal successors, (22), 5 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 22 [2021-03-10 20:31:55,122 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-03-10 20:31:55,123 INFO L225 Difference]: With dead ends: 322 [2021-03-10 20:31:55,123 INFO L226 Difference]: Without dead ends: 310 [2021-03-10 20:31:55,123 INFO L775 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 20 SyntacticMatches, 4 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 27.1ms TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-03-10 20:31:55,123 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 310 states. [2021-03-10 20:31:55,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 310 to 244. [2021-03-10 20:31:55,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 244 states, 243 states have (on average 2.2181069958847734) internal successors, (539), 243 states have internal predecessors, (539), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-10 20:31:55,127 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 244 states to 244 states and 539 transitions. [2021-03-10 20:31:55,127 INFO L78 Accepts]: Start accepts. Automaton has 244 states and 539 transitions. Word has length 22 [2021-03-10 20:31:55,127 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-03-10 20:31:55,127 INFO L480 AbstractCegarLoop]: Abstraction has 244 states and 539 transitions. [2021-03-10 20:31:55,128 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 5 states have (on average 4.4) internal successors, (22), 5 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) [2021-03-10 20:31:55,128 INFO L276 IsEmpty]: Start isEmpty. Operand 244 states and 539 transitions. [2021-03-10 20:31:55,128 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-03-10 20:31:55,128 INFO L511 BasicCegarLoop]: Found error trace [2021-03-10 20:31:55,128 INFO L519 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-10 20:31:55,350 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2021-03-10 20:31:55,350 INFO L428 AbstractCegarLoop]: === Iteration 39 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-10 20:31:55,351 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-10 20:31:55,351 INFO L82 PathProgramCache]: Analyzing trace with hash -1965218720, now seen corresponding path program 35 times [2021-03-10 20:31:55,351 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-10 20:31:55,351 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1785876727] [2021-03-10 20:31:55,351 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-10 20:31:55,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-10 20:31:55,391 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-03-10 20:31:55,391 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1785876727] [2021-03-10 20:31:55,391 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1434512276] [2021-03-10 20:31:55,391 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 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 [2021-03-10 20:31:55,406 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-03-10 20:31:55,406 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-03-10 20:31:55,407 INFO L263 TraceCheckSpWp]: Trace formula consists of 35 conjuncts, 15 conjunts are in the unsatisfiable core [2021-03-10 20:31:55,407 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-03-10 20:31:55,452 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-03-10 20:31:55,453 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-03-10 20:31:55,453 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 4 [2021-03-10 20:31:55,453 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1562180568] [2021-03-10 20:31:55,453 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-03-10 20:31:55,453 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-10 20:31:55,453 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-03-10 20:31:55,453 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-03-10 20:31:55,454 INFO L87 Difference]: Start difference. First operand 244 states and 539 transitions. Second operand has 6 states, 5 states have (on average 4.4) internal successors, (22), 5 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) [2021-03-10 20:31:55,514 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-03-10 20:31:55,514 INFO L93 Difference]: Finished difference Result 375 states and 800 transitions. [2021-03-10 20:31:55,515 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-03-10 20:31:55,515 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 4.4) internal successors, (22), 5 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 22 [2021-03-10 20:31:55,515 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-03-10 20:31:55,516 INFO L225 Difference]: With dead ends: 375 [2021-03-10 20:31:55,516 INFO L226 Difference]: Without dead ends: 363 [2021-03-10 20:31:55,516 INFO L775 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 17 SyntacticMatches, 7 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 35.0ms TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-03-10 20:31:55,517 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 363 states. [2021-03-10 20:31:55,521 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 363 to 294. [2021-03-10 20:31:55,521 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 294 states, 293 states have (on average 2.266211604095563) internal successors, (664), 293 states have internal predecessors, (664), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-10 20:31:55,522 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 294 states to 294 states and 664 transitions. [2021-03-10 20:31:55,522 INFO L78 Accepts]: Start accepts. Automaton has 294 states and 664 transitions. Word has length 22 [2021-03-10 20:31:55,522 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-03-10 20:31:55,522 INFO L480 AbstractCegarLoop]: Abstraction has 294 states and 664 transitions. [2021-03-10 20:31:55,522 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 5 states have (on average 4.4) internal successors, (22), 5 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) [2021-03-10 20:31:55,522 INFO L276 IsEmpty]: Start isEmpty. Operand 294 states and 664 transitions. [2021-03-10 20:31:55,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-03-10 20:31:55,523 INFO L511 BasicCegarLoop]: Found error trace [2021-03-10 20:31:55,523 INFO L519 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-10 20:31:55,739 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-03-10 20:31:55,739 INFO L428 AbstractCegarLoop]: === Iteration 40 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-10 20:31:55,739 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-10 20:31:55,739 INFO L82 PathProgramCache]: Analyzing trace with hash 116908384, now seen corresponding path program 36 times [2021-03-10 20:31:55,740 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-10 20:31:55,740 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2026248807] [2021-03-10 20:31:55,740 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-10 20:31:55,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-10 20:31:55,776 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-03-10 20:31:55,777 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2026248807] [2021-03-10 20:31:55,777 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1639324513] [2021-03-10 20:31:55,777 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 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 [2021-03-10 20:31:55,804 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 6 check-sat command(s) [2021-03-10 20:31:55,805 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-03-10 20:31:55,805 INFO L263 TraceCheckSpWp]: Trace formula consists of 35 conjuncts, 7 conjunts are in the unsatisfiable core [2021-03-10 20:31:55,805 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-03-10 20:31:55,890 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 13 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-03-10 20:31:55,890 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-03-10 20:31:55,890 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [4] total 10 [2021-03-10 20:31:55,891 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1699519865] [2021-03-10 20:31:55,891 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-03-10 20:31:55,891 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-10 20:31:55,891 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-03-10 20:31:55,891 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-03-10 20:31:55,891 INFO L87 Difference]: Start difference. First operand 294 states and 664 transitions. Second operand has 8 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 8 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-10 20:31:55,967 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-03-10 20:31:55,967 INFO L93 Difference]: Finished difference Result 320 states and 710 transitions. [2021-03-10 20:31:55,968 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-03-10 20:31:55,968 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 8 states have internal predecessors, (19), 0 states have call successors, (0), 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 22 [2021-03-10 20:31:55,968 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-03-10 20:31:55,969 INFO L225 Difference]: With dead ends: 320 [2021-03-10 20:31:55,969 INFO L226 Difference]: Without dead ends: 308 [2021-03-10 20:31:55,969 INFO L775 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 117.6ms TimeCoverageRelationStatistics Valid=59, Invalid=181, Unknown=0, NotChecked=0, Total=240 [2021-03-10 20:31:55,969 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 308 states. [2021-03-10 20:31:55,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 308 to 291. [2021-03-10 20:31:55,972 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 291 states, 290 states have (on average 2.193103448275862) internal successors, (636), 290 states have internal predecessors, (636), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-10 20:31:55,973 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 291 states to 291 states and 636 transitions. [2021-03-10 20:31:55,973 INFO L78 Accepts]: Start accepts. Automaton has 291 states and 636 transitions. Word has length 22 [2021-03-10 20:31:55,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-03-10 20:31:55,973 INFO L480 AbstractCegarLoop]: Abstraction has 291 states and 636 transitions. [2021-03-10 20:31:55,973 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 8 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-10 20:31:55,973 INFO L276 IsEmpty]: Start isEmpty. Operand 291 states and 636 transitions. [2021-03-10 20:31:55,974 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-03-10 20:31:55,974 INFO L511 BasicCegarLoop]: Found error trace [2021-03-10 20:31:55,974 INFO L519 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-10 20:31:56,187 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2021-03-10 20:31:56,187 INFO L428 AbstractCegarLoop]: === Iteration 41 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-10 20:31:56,187 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-10 20:31:56,187 INFO L82 PathProgramCache]: Analyzing trace with hash -694299372, now seen corresponding path program 37 times [2021-03-10 20:31:56,188 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-10 20:31:56,188 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1999500370] [2021-03-10 20:31:56,188 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-10 20:31:56,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-10 20:31:56,229 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-03-10 20:31:56,230 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1999500370] [2021-03-10 20:31:56,230 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [988392895] [2021-03-10 20:31:56,230 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 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 [2021-03-10 20:31:56,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-10 20:31:56,244 INFO L263 TraceCheckSpWp]: Trace formula consists of 35 conjuncts, 15 conjunts are in the unsatisfiable core [2021-03-10 20:31:56,244 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-03-10 20:31:56,283 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-03-10 20:31:56,283 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-03-10 20:31:56,283 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 4 [2021-03-10 20:31:56,283 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [320187112] [2021-03-10 20:31:56,283 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-03-10 20:31:56,283 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-10 20:31:56,284 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-03-10 20:31:56,284 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-03-10 20:31:56,284 INFO L87 Difference]: Start difference. First operand 291 states and 636 transitions. Second operand has 6 states, 5 states have (on average 4.4) internal successors, (22), 5 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) [2021-03-10 20:31:56,346 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-03-10 20:31:56,346 INFO L93 Difference]: Finished difference Result 425 states and 900 transitions. [2021-03-10 20:31:56,347 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-03-10 20:31:56,347 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 4.4) internal successors, (22), 5 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 22 [2021-03-10 20:31:56,347 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-03-10 20:31:56,348 INFO L225 Difference]: With dead ends: 425 [2021-03-10 20:31:56,348 INFO L226 Difference]: Without dead ends: 416 [2021-03-10 20:31:56,349 INFO L775 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 17 SyntacticMatches, 7 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 32.8ms TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-03-10 20:31:56,349 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 416 states. [2021-03-10 20:31:56,353 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 416 to 350. [2021-03-10 20:31:56,354 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 350 states, 349 states have (on average 2.226361031518625) internal successors, (777), 349 states have internal predecessors, (777), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-10 20:31:56,354 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 350 states to 350 states and 777 transitions. [2021-03-10 20:31:56,354 INFO L78 Accepts]: Start accepts. Automaton has 350 states and 777 transitions. Word has length 22 [2021-03-10 20:31:56,354 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-03-10 20:31:56,355 INFO L480 AbstractCegarLoop]: Abstraction has 350 states and 777 transitions. [2021-03-10 20:31:56,355 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 5 states have (on average 4.4) internal successors, (22), 5 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) [2021-03-10 20:31:56,355 INFO L276 IsEmpty]: Start isEmpty. Operand 350 states and 777 transitions. [2021-03-10 20:31:56,355 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-03-10 20:31:56,355 INFO L511 BasicCegarLoop]: Found error trace [2021-03-10 20:31:56,355 INFO L519 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-10 20:31:56,576 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable40 [2021-03-10 20:31:56,576 INFO L428 AbstractCegarLoop]: === Iteration 42 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-10 20:31:56,577 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-10 20:31:56,577 INFO L82 PathProgramCache]: Analyzing trace with hash -1224912364, now seen corresponding path program 38 times [2021-03-10 20:31:56,577 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-10 20:31:56,577 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [193432134] [2021-03-10 20:31:56,577 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-10 20:31:56,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-10 20:31:56,615 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-03-10 20:31:56,615 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [193432134] [2021-03-10 20:31:56,615 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [647738338] [2021-03-10 20:31:56,615 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 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 [2021-03-10 20:31:56,629 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-03-10 20:31:56,629 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-03-10 20:31:56,630 INFO L263 TraceCheckSpWp]: Trace formula consists of 35 conjuncts, 11 conjunts are in the unsatisfiable core [2021-03-10 20:31:56,630 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-03-10 20:31:56,751 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 10 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-10 20:31:56,752 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-03-10 20:31:56,752 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 9] total 12 [2021-03-10 20:31:56,752 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [801029310] [2021-03-10 20:31:56,752 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-03-10 20:31:56,752 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-10 20:31:56,753 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-03-10 20:31:56,753 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=124, Unknown=0, NotChecked=0, Total=182 [2021-03-10 20:31:56,754 INFO L87 Difference]: Start difference. First operand 350 states and 777 transitions. Second operand has 14 states, 13 states have (on average 3.0) internal successors, (39), 13 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) [2021-03-10 20:31:56,980 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-03-10 20:31:56,980 INFO L93 Difference]: Finished difference Result 623 states and 1302 transitions. [2021-03-10 20:31:56,980 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-03-10 20:31:56,981 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 3.0) internal successors, (39), 13 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 22 [2021-03-10 20:31:56,981 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-03-10 20:31:56,983 INFO L225 Difference]: With dead ends: 623 [2021-03-10 20:31:56,983 INFO L226 Difference]: Without dead ends: 605 [2021-03-10 20:31:56,983 INFO L775 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 14 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 156.6ms TimeCoverageRelationStatistics Valid=123, Invalid=297, Unknown=0, NotChecked=0, Total=420 [2021-03-10 20:31:56,984 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 605 states. [2021-03-10 20:31:56,989 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 605 to 410. [2021-03-10 20:31:56,989 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 410 states, 409 states have (on average 2.2665036674816625) internal successors, (927), 409 states have internal predecessors, (927), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-10 20:31:56,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 410 states to 410 states and 927 transitions. [2021-03-10 20:31:56,990 INFO L78 Accepts]: Start accepts. Automaton has 410 states and 927 transitions. Word has length 22 [2021-03-10 20:31:56,990 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-03-10 20:31:56,990 INFO L480 AbstractCegarLoop]: Abstraction has 410 states and 927 transitions. [2021-03-10 20:31:56,990 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 13 states have (on average 3.0) internal successors, (39), 13 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) [2021-03-10 20:31:56,990 INFO L276 IsEmpty]: Start isEmpty. Operand 410 states and 927 transitions. [2021-03-10 20:31:56,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-03-10 20:31:56,991 INFO L511 BasicCegarLoop]: Found error trace [2021-03-10 20:31:56,991 INFO L519 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-10 20:31:57,207 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,39 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-03-10 20:31:57,207 INFO L428 AbstractCegarLoop]: === Iteration 43 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-10 20:31:57,207 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-10 20:31:57,207 INFO L82 PathProgramCache]: Analyzing trace with hash -972138362, now seen corresponding path program 39 times [2021-03-10 20:31:57,208 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-10 20:31:57,208 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [882994684] [2021-03-10 20:31:57,208 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-10 20:31:57,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-10 20:31:57,256 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 8 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-10 20:31:57,256 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [882994684] [2021-03-10 20:31:57,256 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [840247299] [2021-03-10 20:31:57,256 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 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-03-10 20:31:57,276 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-03-10 20:31:57,276 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-03-10 20:31:57,276 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 7 conjunts are in the unsatisfiable core [2021-03-10 20:31:57,277 INFO L286 TraceCheckSpWp]: Computing forward predicates... Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-03-10 20:31:57,363 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-03-10 20:31:57,363 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-03-10 20:31:57,364 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [9] total 15 [2021-03-10 20:31:57,364 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [953062033] [2021-03-10 20:31:57,364 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-03-10 20:31:57,364 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-10 20:31:57,365 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-03-10 20:31:57,365 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2021-03-10 20:31:57,365 INFO L87 Difference]: Start difference. First operand 410 states and 927 transitions. Second operand has 8 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 8 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-10 20:31:57,464 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-03-10 20:31:57,464 INFO L93 Difference]: Finished difference Result 428 states and 965 transitions. [2021-03-10 20:31:57,464 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-03-10 20:31:57,465 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 8 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-03-10 20:31:57,465 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-03-10 20:31:57,465 INFO L225 Difference]: With dead ends: 428 [2021-03-10 20:31:57,465 INFO L226 Difference]: Without dead ends: 0 [2021-03-10 20:31:57,465 INFO L775 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 149.6ms TimeCoverageRelationStatistics Valid=79, Invalid=301, Unknown=0, NotChecked=0, Total=380 [2021-03-10 20:31:57,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-03-10 20:31:57,466 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-03-10 20:31:57,466 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-10 20:31:57,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-03-10 20:31:57,466 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 24 [2021-03-10 20:31:57,466 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-03-10 20:31:57,468 INFO L480 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-03-10 20:31:57,468 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 8 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-10 20:31:57,468 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-03-10 20:31:57,468 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-03-10 20:31:57,668 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42,40 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-03-10 20:31:57,672 INFO L202 PluginConnector]: Adding new model MirabelleConcurrentIncrement.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 10.03 08:31:57 BasicIcfg [2021-03-10 20:31:57,672 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-03-10 20:31:57,673 INFO L168 Benchmark]: Toolchain (without parser) took 17678.59 ms. Allocated memory was 255.9 MB in the beginning and 425.7 MB in the end (delta: 169.9 MB). Free memory was 236.5 MB in the beginning and 181.1 MB in the end (delta: 55.4 MB). Peak memory consumption was 225.8 MB. Max. memory is 16.0 GB. [2021-03-10 20:31:57,673 INFO L168 Benchmark]: Boogie PL CUP Parser took 0.12 ms. Allocated memory is still 255.9 MB. Free memory is still 237.6 MB. There was no memory consumed. Max. memory is 16.0 GB. [2021-03-10 20:31:57,673 INFO L168 Benchmark]: Boogie Procedure Inliner took 22.30 ms. Allocated memory is still 255.9 MB. Free memory was 236.0 MB in the beginning and 234.6 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.0 GB. [2021-03-10 20:31:57,673 INFO L168 Benchmark]: Boogie Preprocessor took 13.11 ms. Allocated memory is still 255.9 MB. Free memory was 234.6 MB in the beginning and 233.7 MB in the end (delta: 941.5 kB). Peak memory consumption was 2.1 MB. Max. memory is 16.0 GB. [2021-03-10 20:31:57,673 INFO L168 Benchmark]: RCFGBuilder took 207.19 ms. Allocated memory is still 255.9 MB. Free memory was 233.5 MB in the beginning and 238.9 MB in the end (delta: -5.4 MB). Peak memory consumption was 17.8 MB. Max. memory is 16.0 GB. [2021-03-10 20:31:57,673 INFO L168 Benchmark]: TraceAbstraction took 17422.68 ms. Allocated memory was 255.9 MB in the beginning and 425.7 MB in the end (delta: 169.9 MB). Free memory was 238.3 MB in the beginning and 181.1 MB in the end (delta: 57.2 MB). Peak memory consumption was 226.8 MB. Max. memory is 16.0 GB. [2021-03-10 20:31:57,673 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 0.12 ms. Allocated memory is still 255.9 MB. Free memory is still 237.6 MB. There was no memory consumed. Max. memory is 16.0 GB. * Boogie Procedure Inliner took 22.30 ms. Allocated memory is still 255.9 MB. Free memory was 236.0 MB in the beginning and 234.6 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.0 GB. * Boogie Preprocessor took 13.11 ms. Allocated memory is still 255.9 MB. Free memory was 234.6 MB in the beginning and 233.7 MB in the end (delta: 941.5 kB). Peak memory consumption was 2.1 MB. Max. memory is 16.0 GB. * RCFGBuilder took 207.19 ms. Allocated memory is still 255.9 MB. Free memory was 233.5 MB in the beginning and 238.9 MB in the end (delta: -5.4 MB). Peak memory consumption was 17.8 MB. Max. memory is 16.0 GB. * TraceAbstraction took 17422.68 ms. Allocated memory was 255.9 MB in the beginning and 425.7 MB in the end (delta: 169.9 MB). Free memory was 238.3 MB in the beginning and 181.1 MB in the end (delta: 57.2 MB). Peak memory consumption was 226.8 MB. Max. memory is 16.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 24]: assertion always holds For all program executions holds that assertion always holds at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - StatisticsResult: Ultimate Automizer benchmark data CFG has 3 procedures, 17 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 17352.7ms, OverallIterations: 43, TraceHistogramMax: 4, EmptinessCheckTime: 39.7ms, AutomataDifference: 3697.1ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 23.2ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 851 SDtfs, 2233 SDslu, 2558 SDs, 0 SdLazy, 3384 SolverSat, 492 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1759.6ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 1102 GetRequests, 676 SyntacticMatches, 60 SemanticMatches, 366 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 590 ImplicationChecksByTransitivity, 2256.5ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=410occurred in iteration=42, InterpolantAutomatonStates: 408, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 296.5ms AutomataMinimizationTime, 43 MinimizatonAttempts, 2839 StatesRemovedByMinimization, 42 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 80.2ms SsaConstructionTime, 357.8ms SatisfiabilityAnalysisTime, 3546.9ms InterpolantComputationTime, 1520 NumberOfCodeBlocks, 1510 NumberOfCodeBlocksAsserted, 143 NumberOfCheckSat, 1438 ConstructedInterpolants, 0 QuantifiedInterpolants, 5559 SizeOfPredicates, 33 NumberOfNonLiveVariables, 1167 ConjunctsInSsa, 290 ConjunctsInUnsatCore, 82 InterpolantComputations, 7 PerfectInterpolantSequences, 371/866 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...