/usr/bin/java -Xmx16000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -s ../../../trunk/examples/settings/automizer/concurrent/svcomp-Reach-32bit-Automizer_Default-noMmResRef-FA-NoLbe.epf -tc ../../../trunk/examples/toolchains/AutomizerBplInline.xml -i ../../../trunk/examples/concurrent/bpl/weaver-benchmarks/generated/popl20-more/inc-subseq-array.wvr.bpl -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-770125f [2021-05-21 21:18:18,257 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-21 21:18:18,259 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-21 21:18:18,298 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-21 21:18:18,355 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/concurrent/svcomp-Reach-32bit-Automizer_Default-noMmResRef-FA-NoLbe.epf [2021-05-21 21:18:18,391 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-21 21:18:18,391 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-21 21:18:18,392 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-05-21 21:18:18,392 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-05-21 21:18:18,394 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-21 21:18:18,394 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-21 21:18:18,394 INFO L138 SettingsManager]: * Use SBE=true [2021-05-21 21:18:18,395 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-21 21:18:18,395 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-21 21:18:18,395 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-21 21:18:18,396 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-21 21:18:18,396 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-21 21:18:18,396 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-21 21:18:18,396 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-21 21:18:18,396 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-21 21:18:18,396 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-21 21:18:18,396 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-21 21:18:18,397 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-21 21:18:18,397 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-21 21:18:18,397 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-21 21:18:18,397 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-21 21:18:18,397 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-21 21:18:18,397 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-21 21:18:18,397 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-21 21:18:18,398 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-21 21:18:18,398 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-21 21:18:18,398 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-21 21:18:18,398 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-21 21:18:18,398 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-21 21:18:18,398 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-05-21 21:18:18,398 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-21 21:18:18,398 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-05-21 21:18:18,708 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-21 21:18:18,727 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-21 21:18:18,730 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-21 21:18:18,731 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2021-05-21 21:18:18,732 INFO L275 PluginConnector]: Boogie PL CUP Parser initialized [2021-05-21 21:18:18,733 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/weaver-benchmarks/generated/popl20-more/inc-subseq-array.wvr.bpl [2021-05-21 21:18:18,733 INFO L110 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/weaver-benchmarks/generated/popl20-more/inc-subseq-array.wvr.bpl' [2021-05-21 21:18:18,773 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-21 21:18:18,774 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-21 21:18:18,775 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-05-21 21:18:18,775 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-05-21 21:18:18,775 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-05-21 21:18:18,786 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "inc-subseq-array.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 21.05 09:18:18" (1/1) ... [2021-05-21 21:18:18,792 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "inc-subseq-array.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 21.05 09:18:18" (1/1) ... [2021-05-21 21:18:18,798 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-05-21 21:18:18,800 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-21 21:18:18,800 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-21 21:18:18,800 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-21 21:18:18,805 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "inc-subseq-array.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 21.05 09:18:18" (1/1) ... [2021-05-21 21:18:18,806 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "inc-subseq-array.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 21.05 09:18:18" (1/1) ... [2021-05-21 21:18:18,806 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "inc-subseq-array.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 21.05 09:18:18" (1/1) ... [2021-05-21 21:18:18,806 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "inc-subseq-array.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 21.05 09:18:18" (1/1) ... [2021-05-21 21:18:18,808 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "inc-subseq-array.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 21.05 09:18:18" (1/1) ... [2021-05-21 21:18:18,811 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "inc-subseq-array.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 21.05 09:18:18" (1/1) ... [2021-05-21 21:18:18,811 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "inc-subseq-array.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 21.05 09:18:18" (1/1) ... [2021-05-21 21:18:18,812 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-21 21:18:18,813 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-21 21:18:18,814 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-21 21:18:18,814 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-21 21:18:18,816 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "inc-subseq-array.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 21.05 09:18:18" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-21 21:18:18,883 INFO L124 BoogieDeclarations]: Specification and implementation of procedure thread1 given in one single declaration [2021-05-21 21:18:18,883 INFO L130 BoogieDeclarations]: Found specification of procedure thread1 [2021-05-21 21:18:18,883 INFO L138 BoogieDeclarations]: Found implementation of procedure thread1 [2021-05-21 21:18:18,883 INFO L124 BoogieDeclarations]: Specification and implementation of procedure thread2 given in one single declaration [2021-05-21 21:18:18,884 INFO L130 BoogieDeclarations]: Found specification of procedure thread2 [2021-05-21 21:18:18,884 INFO L138 BoogieDeclarations]: Found implementation of procedure thread2 [2021-05-21 21:18:18,884 INFO L124 BoogieDeclarations]: Specification and implementation of procedure ULTIMATE.start given in one single declaration [2021-05-21 21:18:18,884 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-21 21:18:18,884 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-21 21:18:18,885 WARN L209 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to SingleStatement [2021-05-21 21:18:19,043 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-21 21:18:19,043 INFO L299 CfgBuilder]: Removed 0 assume(true) statements. [2021-05-21 21:18:19,045 INFO L202 PluginConnector]: Adding new model inc-subseq-array.wvr.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.05 09:18:19 BoogieIcfgContainer [2021-05-21 21:18:19,045 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-21 21:18:19,046 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-21 21:18:19,046 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-21 21:18:19,049 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-21 21:18:19,049 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "inc-subseq-array.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 21.05 09:18:18" (1/2) ... [2021-05-21 21:18:19,050 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@63372a9a and model type inc-subseq-array.wvr.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.05 09:18:19, skipping insertion in model container [2021-05-21 21:18:19,050 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "inc-subseq-array.wvr.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.05 09:18:19" (2/2) ... [2021-05-21 21:18:19,051 INFO L111 eAbstractionObserver]: Analyzing ICFG inc-subseq-array.wvr.bpl [2021-05-21 21:18:19,055 WARN L148 ceAbstractionStarter]: Switching off computation of Hoare annotation because input is a concurrent program [2021-05-21 21:18:19,056 INFO L214 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-21 21:18:19,056 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-05-21 21:18:19,057 INFO L478 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2021-05-21 21:18:19,081 INFO L149 ThreadInstanceAdder]: Constructed 2 joinOtherThreadTransitions. [2021-05-21 21:18:19,098 INFO L255 AbstractCegarLoop]: Starting to check reachability of 3 error locations. [2021-05-21 21:18:19,129 INFO L378 AbstractCegarLoop]: Interprodecural is true [2021-05-21 21:18:19,129 INFO L379 AbstractCegarLoop]: Hoare is false [2021-05-21 21:18:19,129 INFO L380 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-21 21:18:19,129 INFO L381 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-21 21:18:19,129 INFO L382 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-21 21:18:19,130 INFO L383 AbstractCegarLoop]: Difference is false [2021-05-21 21:18:19,130 INFO L384 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-21 21:18:19,130 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-21 21:18:19,137 INFO L100 iNet2FiniteAutomaton]: Start petriNet2FiniteAutomaton. Operand has 32 places, 28 transitions, 72 flow [2021-05-21 21:18:19,148 INFO L122 iNet2FiniteAutomaton]: Finished petriNet2FiniteAutomaton. Result has 65 states, 63 states have (on average 2.015873015873016) internal successors, (127), 64 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-21 21:18:19,150 INFO L276 IsEmpty]: Start isEmpty. Operand has 65 states, 63 states have (on average 2.015873015873016) internal successors, (127), 64 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-21 21:18:19,155 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-21 21:18:19,155 INFO L513 BasicCegarLoop]: Found error trace [2021-05-21 21:18:19,155 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-21 21:18:19,155 INFO L430 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-21 21:18:19,159 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-21 21:18:19,159 INFO L82 PathProgramCache]: Analyzing trace with hash 1034289359, now seen corresponding path program 1 times [2021-05-21 21:18:19,166 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-21 21:18:19,166 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1930792674] [2021-05-21 21:18:19,166 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-21 21:18:19,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 21:18:19,340 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-21 21:18:19,340 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-21 21:18:19,340 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1930792674] [2021-05-21 21:18:19,341 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1930792674] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-21 21:18:19,341 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-21 21:18:19,341 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-21 21:18:19,342 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1913647686] [2021-05-21 21:18:19,346 INFO L462 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-21 21:18:19,347 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-21 21:18:19,356 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-21 21:18:19,361 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-21 21:18:19,364 INFO L87 Difference]: Start difference. First operand has 65 states, 63 states have (on average 2.015873015873016) internal successors, (127), 64 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 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) [2021-05-21 21:18:19,404 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-21 21:18:19,404 INFO L93 Difference]: Finished difference Result 104 states and 211 transitions. [2021-05-21 21:18:19,404 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-21 21:18:19,405 INFO L78 Accepts]: Start accepts. Automaton has has 3 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 [2021-05-21 21:18:19,406 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-21 21:18:19,420 INFO L225 Difference]: With dead ends: 104 [2021-05-21 21:18:19,420 INFO L226 Difference]: Without dead ends: 87 [2021-05-21 21:18:19,422 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 28.7ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-21 21:18:19,435 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2021-05-21 21:18:19,467 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 71. [2021-05-21 21:18:19,470 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 70 states have (on average 2.0285714285714285) internal successors, (142), 70 states have internal predecessors, (142), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-21 21:18:19,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 142 transitions. [2021-05-21 21:18:19,473 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 142 transitions. Word has length 14 [2021-05-21 21:18:19,474 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-21 21:18:19,474 INFO L482 AbstractCegarLoop]: Abstraction has 71 states and 142 transitions. [2021-05-21 21:18:19,474 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 3 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) [2021-05-21 21:18:19,474 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 142 transitions. [2021-05-21 21:18:19,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-21 21:18:19,476 INFO L513 BasicCegarLoop]: Found error trace [2021-05-21 21:18:19,476 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-21 21:18:19,477 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-21 21:18:19,477 INFO L430 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-21 21:18:19,481 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-21 21:18:19,482 INFO L82 PathProgramCache]: Analyzing trace with hash -690736212, now seen corresponding path program 1 times [2021-05-21 21:18:19,482 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-21 21:18:19,484 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1927848033] [2021-05-21 21:18:19,484 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-21 21:18:19,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 21:18:19,572 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-21 21:18:19,572 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-21 21:18:19,572 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1927848033] [2021-05-21 21:18:19,573 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1927848033] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-21 21:18:19,573 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-21 21:18:19,573 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-21 21:18:19,573 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [201439209] [2021-05-21 21:18:19,575 INFO L462 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-21 21:18:19,575 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-21 21:18:19,578 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-21 21:18:19,578 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-05-21 21:18:19,578 INFO L87 Difference]: Start difference. First operand 71 states and 142 transitions. Second operand has 4 states, 4 states have (on average 4.5) internal successors, (18), 3 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) [2021-05-21 21:18:19,622 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-21 21:18:19,622 INFO L93 Difference]: Finished difference Result 91 states and 175 transitions. [2021-05-21 21:18:19,624 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-21 21:18:19,624 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.5) internal successors, (18), 3 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 [2021-05-21 21:18:19,624 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-21 21:18:19,625 INFO L225 Difference]: With dead ends: 91 [2021-05-21 21:18:19,625 INFO L226 Difference]: Without dead ends: 83 [2021-05-21 21:18:19,625 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 21.0ms TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-05-21 21:18:19,626 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-05-21 21:18:19,631 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 83. [2021-05-21 21:18:19,632 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 82 states have (on average 2.0121951219512195) internal successors, (165), 82 states have internal predecessors, (165), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-21 21:18:19,635 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 165 transitions. [2021-05-21 21:18:19,635 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 165 transitions. Word has length 18 [2021-05-21 21:18:19,635 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-21 21:18:19,636 INFO L482 AbstractCegarLoop]: Abstraction has 83 states and 165 transitions. [2021-05-21 21:18:19,636 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 4.5) internal successors, (18), 3 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) [2021-05-21 21:18:19,636 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 165 transitions. [2021-05-21 21:18:19,638 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-21 21:18:19,638 INFO L513 BasicCegarLoop]: Found error trace [2021-05-21 21:18:19,638 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-21 21:18:19,638 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-21 21:18:19,638 INFO L430 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-21 21:18:19,639 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-21 21:18:19,640 INFO L82 PathProgramCache]: Analyzing trace with hash 1451962588, now seen corresponding path program 1 times [2021-05-21 21:18:19,640 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-21 21:18:19,641 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1350169054] [2021-05-21 21:18:19,641 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-21 21:18:19,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 21:18:19,816 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-21 21:18:19,816 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-21 21:18:19,816 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1350169054] [2021-05-21 21:18:19,816 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1350169054] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 21:18:19,817 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [304267502] [2021-05-21 21:18:19,817 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-21 21:18:19,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 21:18:19,862 INFO L263 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-21 21:18:19,867 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-21 21:18:20,066 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-05-21 21:18:20,070 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-21 21:18:20,074 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-21 21:18:20,076 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-21 21:18:20,076 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:14, output treesize:7 [2021-05-21 21:18:20,116 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-05-21 21:18:20,120 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-21 21:18:20,124 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-21 21:18:20,127 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-21 21:18:20,129 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:12, output treesize:5 [2021-05-21 21:18:20,156 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-21 21:18:20,157 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [304267502] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 21:18:20,157 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-21 21:18:20,158 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 11 [2021-05-21 21:18:20,158 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [938167532] [2021-05-21 21:18:20,159 INFO L462 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-21 21:18:20,162 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-21 21:18:20,163 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-21 21:18:20,164 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=94, Unknown=0, NotChecked=0, Total=132 [2021-05-21 21:18:20,164 INFO L87 Difference]: Start difference. First operand 83 states and 165 transitions. Second operand has 12 states, 12 states have (on average 2.6666666666666665) internal successors, (32), 11 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-21 21:18:20,293 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-21 21:18:20,293 INFO L93 Difference]: Finished difference Result 154 states and 314 transitions. [2021-05-21 21:18:20,294 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-21 21:18:20,294 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.6666666666666665) internal successors, (32), 11 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2021-05-21 21:18:20,294 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-21 21:18:20,298 INFO L225 Difference]: With dead ends: 154 [2021-05-21 21:18:20,299 INFO L226 Difference]: Without dead ends: 137 [2021-05-21 21:18:20,299 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 116.0ms TimeCoverageRelationStatistics Valid=47, Invalid=109, Unknown=0, NotChecked=0, Total=156 [2021-05-21 21:18:20,301 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2021-05-21 21:18:20,318 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 115. [2021-05-21 21:18:20,319 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 114 states have (on average 2.043859649122807) internal successors, (233), 114 states have internal predecessors, (233), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-21 21:18:20,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 233 transitions. [2021-05-21 21:18:20,319 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 233 transitions. Word has length 23 [2021-05-21 21:18:20,319 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-21 21:18:20,320 INFO L482 AbstractCegarLoop]: Abstraction has 115 states and 233 transitions. [2021-05-21 21:18:20,320 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.6666666666666665) internal successors, (32), 11 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-21 21:18:20,320 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 233 transitions. [2021-05-21 21:18:20,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-21 21:18:20,321 INFO L513 BasicCegarLoop]: Found error trace [2021-05-21 21:18:20,321 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-21 21:18:20,549 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-05-21 21:18:20,549 INFO L430 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-21 21:18:20,550 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-21 21:18:20,550 INFO L82 PathProgramCache]: Analyzing trace with hash -1705470663, now seen corresponding path program 2 times [2021-05-21 21:18:20,550 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-21 21:18:20,550 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1129149311] [2021-05-21 21:18:20,550 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-21 21:18:20,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 21:18:20,604 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 6 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-21 21:18:20,604 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-21 21:18:20,604 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1129149311] [2021-05-21 21:18:20,604 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1129149311] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 21:18:20,604 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1987624296] [2021-05-21 21:18:20,604 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-21 21:18:20,643 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-21 21:18:20,643 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-21 21:18:20,643 INFO L263 TraceCheckSpWp]: Trace formula consists of 58 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-21 21:18:20,646 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-21 21:18:20,713 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 6 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-21 21:18:20,713 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1987624296] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 21:18:20,713 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-21 21:18:20,713 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 3] total 6 [2021-05-21 21:18:20,713 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1835064602] [2021-05-21 21:18:20,714 INFO L462 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-21 21:18:20,714 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-21 21:18:20,714 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-21 21:18:20,714 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-05-21 21:18:20,715 INFO L87 Difference]: Start difference. First operand 115 states and 233 transitions. Second operand has 7 states, 7 states have (on average 6.428571428571429) internal successors, (45), 6 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-21 21:18:20,792 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-21 21:18:20,792 INFO L93 Difference]: Finished difference Result 284 states and 566 transitions. [2021-05-21 21:18:20,793 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-21 21:18:20,793 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 6.428571428571429) internal successors, (45), 6 states have internal predecessors, (45), 0 states have call successors, (0), 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 27 [2021-05-21 21:18:20,794 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-21 21:18:20,795 INFO L225 Difference]: With dead ends: 284 [2021-05-21 21:18:20,795 INFO L226 Difference]: Without dead ends: 264 [2021-05-21 21:18:20,795 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 37.3ms TimeCoverageRelationStatistics Valid=25, Invalid=31, Unknown=0, NotChecked=0, Total=56 [2021-05-21 21:18:20,796 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 264 states. [2021-05-21 21:18:20,818 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 264 to 230. [2021-05-21 21:18:20,818 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 230 states, 229 states have (on average 2.1222707423580784) internal successors, (486), 229 states have internal predecessors, (486), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-21 21:18:20,820 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 230 states to 230 states and 486 transitions. [2021-05-21 21:18:20,821 INFO L78 Accepts]: Start accepts. Automaton has 230 states and 486 transitions. Word has length 27 [2021-05-21 21:18:20,821 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-21 21:18:20,822 INFO L482 AbstractCegarLoop]: Abstraction has 230 states and 486 transitions. [2021-05-21 21:18:20,822 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 6.428571428571429) internal successors, (45), 6 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-21 21:18:20,822 INFO L276 IsEmpty]: Start isEmpty. Operand 230 states and 486 transitions. [2021-05-21 21:18:20,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-05-21 21:18:20,828 INFO L513 BasicCegarLoop]: Found error trace [2021-05-21 21:18:20,828 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-21 21:18:21,051 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-21 21:18:21,051 INFO L430 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-21 21:18:21,052 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-21 21:18:21,052 INFO L82 PathProgramCache]: Analyzing trace with hash -906793463, now seen corresponding path program 3 times [2021-05-21 21:18:21,052 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-21 21:18:21,052 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1185195405] [2021-05-21 21:18:21,052 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-21 21:18:21,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 21:18:21,363 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-21 21:18:21,363 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-21 21:18:21,363 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1185195405] [2021-05-21 21:18:21,363 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1185195405] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 21:18:21,363 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [841639803] [2021-05-21 21:18:21,363 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 [2021-05-21 21:18:21,400 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-21 21:18:21,400 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-21 21:18:21,401 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-21 21:18:21,404 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-21 21:18:21,502 WARN L348 FreeRefinementEngine]: Global settings require throwing the following exception [2021-05-21 21:18:21,725 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-21 21:18:21,726 FATAL L? ?]: The Plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction has thrown an exception: java.lang.NullPointerException at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.EqualityInformation.getEqinfo(EqualityInformation.java:130) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.XnfDer.derSimple(XnfDer.java:308) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.XnfDer.tryToEliminate_EqInfoBased(XnfDer.java:138) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.XnfDer.tryToEliminate(XnfDer.java:101) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.PartialQuantifierElimination.elim(PartialQuantifierElimination.java:255) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.PartialQuantifierElimination.tryToEliminate(PartialQuantifierElimination.java:100) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.predicates.IterativePredicateTransformer$QuantifierEliminationPostprocessor.postprocess(IterativePredicateTransformer.java:246) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.predicates.IterativePredicateTransformer.applyPostprocessors(IterativePredicateTransformer.java:440) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.predicates.IterativePredicateTransformer.computeStrongestPostconditionSequence(IterativePredicateTransformer.java:201) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.singletracecheck.TraceCheckSpWp.computeInterpolantsUsingUnsatCore(TraceCheckSpWp.java:299) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.singletracecheck.TraceCheckSpWp.computeInterpolants(TraceCheckSpWp.java:185) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.singletracecheck.TraceCheckSpWp.(TraceCheckSpWp.java:163) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSpWp.construct(IpTcStrategyModuleSpWp.java:108) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSpWp.construct(IpTcStrategyModuleSpWp.java:1) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:297) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:190) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:180) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:439) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:374) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:69) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:63) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:371) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:307) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseConcurrentProgram(TraceAbstractionStarter.java:236) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:167) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-05-21 21:18:21,728 INFO L168 Benchmark]: Toolchain (without parser) took 2954.45 ms. Allocated memory is still 354.4 MB. Free memory was 333.9 MB in the beginning and 201.2 MB in the end (delta: 132.7 MB). Peak memory consumption was 133.7 MB. Max. memory is 16.0 GB. [2021-05-21 21:18:21,729 INFO L168 Benchmark]: Boogie PL CUP Parser took 0.14 ms. Allocated memory is still 354.4 MB. Free memory is still 334.9 MB. There was no memory consumed. Max. memory is 16.0 GB. [2021-05-21 21:18:21,729 INFO L168 Benchmark]: Boogie Procedure Inliner took 23.86 ms. Allocated memory is still 354.4 MB. Free memory was 333.7 MB in the beginning and 332.3 MB in the end (delta: 1.4 MB). There was no memory consumed. Max. memory is 16.0 GB. [2021-05-21 21:18:21,729 INFO L168 Benchmark]: Boogie Preprocessor took 12.73 ms. Allocated memory is still 354.4 MB. Free memory was 332.3 MB in the beginning and 331.4 MB in the end (delta: 961.7 kB). Peak memory consumption was 2.1 MB. Max. memory is 16.0 GB. [2021-05-21 21:18:21,729 INFO L168 Benchmark]: RCFGBuilder took 231.56 ms. Allocated memory is still 354.4 MB. Free memory was 331.3 MB in the beginning and 318.5 MB in the end (delta: 12.7 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.0 GB. [2021-05-21 21:18:21,729 INFO L168 Benchmark]: TraceAbstraction took 2681.62 ms. Allocated memory is still 354.4 MB. Free memory was 318.0 MB in the beginning and 201.2 MB in the end (delta: 116.8 MB). Peak memory consumption was 116.9 MB. Max. memory is 16.0 GB. [2021-05-21 21:18:21,730 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * Boogie PL CUP Parser took 0.14 ms. Allocated memory is still 354.4 MB. Free memory is still 334.9 MB. There was no memory consumed. Max. memory is 16.0 GB. * Boogie Procedure Inliner took 23.86 ms. Allocated memory is still 354.4 MB. Free memory was 333.7 MB in the beginning and 332.3 MB in the end (delta: 1.4 MB). There was no memory consumed. Max. memory is 16.0 GB. * Boogie Preprocessor took 12.73 ms. Allocated memory is still 354.4 MB. Free memory was 332.3 MB in the beginning and 331.4 MB in the end (delta: 961.7 kB). Peak memory consumption was 2.1 MB. Max. memory is 16.0 GB. * RCFGBuilder took 231.56 ms. Allocated memory is still 354.4 MB. Free memory was 331.3 MB in the beginning and 318.5 MB in the end (delta: 12.7 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.0 GB. * TraceAbstraction took 2681.62 ms. Allocated memory is still 354.4 MB. Free memory was 318.0 MB in the beginning and 201.2 MB in the end (delta: 116.8 MB). Peak memory consumption was 116.9 MB. Max. memory is 16.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - ExceptionOrErrorResult: NullPointerException: null de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: NullPointerException: null: de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.EqualityInformation.getEqinfo(EqualityInformation.java:130) RESULT: Ultimate could not prove your program: Toolchain returned no result. Received shutdown request...