/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-Separate.epf -tc ../../../trunk/examples/toolchains/AutomizerBplInline.xml -i ../../../trunk/examples/concurrent/bpl/weaver-benchmarks/generated/parallel/parallel-sum-2.wvr.bpl -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-770125f [2021-05-22 02:25:53,811 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-22 02:25:53,812 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-22 02:25:53,845 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-22 02:25:53,900 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-Separate.epf [2021-05-22 02:25:53,938 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-22 02:25:53,938 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-22 02:25:53,938 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-05-22 02:25:53,938 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-05-22 02:25:53,941 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-22 02:25:53,941 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-22 02:25:53,941 INFO L138 SettingsManager]: * Use SBE=true [2021-05-22 02:25:53,941 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-22 02:25:53,941 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-22 02:25:53,941 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-22 02:25:53,942 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-22 02:25:53,942 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-22 02:25:53,942 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-22 02:25:53,943 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-22 02:25:53,943 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-22 02:25:53,943 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-22 02:25:53,943 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-22 02:25:53,943 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-22 02:25:53,943 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-22 02:25:53,943 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-22 02:25:53,943 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-22 02:25:53,944 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-22 02:25:53,944 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-22 02:25:53,944 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-22 02:25:53,944 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-22 02:25:53,944 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-22 02:25:53,944 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-22 02:25:53,944 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-22 02:25:53,944 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-22 02:25:53,945 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-05-22 02:25:53,945 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-22 02:25:53,945 INFO L138 SettingsManager]: * Check the insufficient thread errors last=true [2021-05-22 02:25:53,945 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-05-22 02:25:54,212 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-22 02:25:54,228 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-22 02:25:54,230 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-22 02:25:54,231 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2021-05-22 02:25:54,232 INFO L275 PluginConnector]: Boogie PL CUP Parser initialized [2021-05-22 02:25:54,233 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/weaver-benchmarks/generated/parallel/parallel-sum-2.wvr.bpl [2021-05-22 02:25:54,233 INFO L110 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/weaver-benchmarks/generated/parallel/parallel-sum-2.wvr.bpl' [2021-05-22 02:25:54,264 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-22 02:25:54,265 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-22 02:25:54,266 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-05-22 02:25:54,266 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-05-22 02:25:54,266 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-05-22 02:25:54,278 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "parallel-sum-2.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 22.05 02:25:54" (1/1) ... [2021-05-22 02:25:54,284 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "parallel-sum-2.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 22.05 02:25:54" (1/1) ... [2021-05-22 02:25:54,290 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-05-22 02:25:54,292 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-22 02:25:54,293 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-22 02:25:54,293 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-22 02:25:54,299 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "parallel-sum-2.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 22.05 02:25:54" (1/1) ... [2021-05-22 02:25:54,300 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "parallel-sum-2.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 22.05 02:25:54" (1/1) ... [2021-05-22 02:25:54,310 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "parallel-sum-2.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 22.05 02:25:54" (1/1) ... [2021-05-22 02:25:54,310 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "parallel-sum-2.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 22.05 02:25:54" (1/1) ... [2021-05-22 02:25:54,317 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "parallel-sum-2.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 22.05 02:25:54" (1/1) ... [2021-05-22 02:25:54,319 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "parallel-sum-2.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 22.05 02:25:54" (1/1) ... [2021-05-22 02:25:54,320 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "parallel-sum-2.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 22.05 02:25:54" (1/1) ... [2021-05-22 02:25:54,320 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-22 02:25:54,321 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-22 02:25:54,321 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-22 02:25:54,321 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-22 02:25:54,324 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "parallel-sum-2.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 22.05 02:25:54" (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 [2021-05-22 02:25:54,394 INFO L124 BoogieDeclarations]: Specification and implementation of procedure thread1 given in one single declaration [2021-05-22 02:25:54,394 INFO L130 BoogieDeclarations]: Found specification of procedure thread1 [2021-05-22 02:25:54,394 INFO L138 BoogieDeclarations]: Found implementation of procedure thread1 [2021-05-22 02:25:54,395 INFO L124 BoogieDeclarations]: Specification and implementation of procedure thread2 given in one single declaration [2021-05-22 02:25:54,395 INFO L130 BoogieDeclarations]: Found specification of procedure thread2 [2021-05-22 02:25:54,395 INFO L138 BoogieDeclarations]: Found implementation of procedure thread2 [2021-05-22 02:25:54,395 INFO L124 BoogieDeclarations]: Specification and implementation of procedure ULTIMATE.start given in one single declaration [2021-05-22 02:25:54,395 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-22 02:25:54,395 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-22 02:25:54,395 INFO L124 BoogieDeclarations]: Specification and implementation of procedure thread3 given in one single declaration [2021-05-22 02:25:54,396 INFO L130 BoogieDeclarations]: Found specification of procedure thread3 [2021-05-22 02:25:54,396 INFO L138 BoogieDeclarations]: Found implementation of procedure thread3 [2021-05-22 02:25:54,396 INFO L124 BoogieDeclarations]: Specification and implementation of procedure thread4 given in one single declaration [2021-05-22 02:25:54,396 INFO L130 BoogieDeclarations]: Found specification of procedure thread4 [2021-05-22 02:25:54,396 INFO L138 BoogieDeclarations]: Found implementation of procedure thread4 [2021-05-22 02:25:54,396 INFO L124 BoogieDeclarations]: Specification and implementation of procedure thread5 given in one single declaration [2021-05-22 02:25:54,396 INFO L130 BoogieDeclarations]: Found specification of procedure thread5 [2021-05-22 02:25:54,397 INFO L138 BoogieDeclarations]: Found implementation of procedure thread5 [2021-05-22 02:25:54,397 INFO L124 BoogieDeclarations]: Specification and implementation of procedure thread6 given in one single declaration [2021-05-22 02:25:54,397 INFO L130 BoogieDeclarations]: Found specification of procedure thread6 [2021-05-22 02:25:54,397 INFO L138 BoogieDeclarations]: Found implementation of procedure thread6 [2021-05-22 02:25:54,398 WARN L209 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to SingleStatement [2021-05-22 02:25:54,597 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-22 02:25:54,597 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2021-05-22 02:25:54,598 WARN L327 CfgBuilder]: Unexpected successor node of atomic block begin: thread2EXIT is neither atomic block end nor error location. [2021-05-22 02:25:54,598 WARN L327 CfgBuilder]: Unexpected successor node of atomic block begin: thread3EXIT is neither atomic block end nor error location. [2021-05-22 02:25:54,598 WARN L327 CfgBuilder]: Unexpected successor node of atomic block begin: thread5EXIT is neither atomic block end nor error location. [2021-05-22 02:25:54,598 WARN L327 CfgBuilder]: Unexpected successor node of atomic block begin: thread6EXIT is neither atomic block end nor error location. [2021-05-22 02:25:54,599 INFO L202 PluginConnector]: Adding new model parallel-sum-2.wvr.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.05 02:25:54 BoogieIcfgContainer [2021-05-22 02:25:54,600 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-22 02:25:54,601 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-22 02:25:54,601 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-22 02:25:54,603 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-22 02:25:54,603 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "parallel-sum-2.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 22.05 02:25:54" (1/2) ... [2021-05-22 02:25:54,604 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@170bac3b and model type parallel-sum-2.wvr.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.05 02:25:54, skipping insertion in model container [2021-05-22 02:25:54,604 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "parallel-sum-2.wvr.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.05 02:25:54" (2/2) ... [2021-05-22 02:25:54,605 INFO L111 eAbstractionObserver]: Analyzing ICFG parallel-sum-2.wvr.bpl [2021-05-22 02:25:54,624 WARN L148 ceAbstractionStarter]: Switching off computation of Hoare annotation because input is a concurrent program [2021-05-22 02:25:54,624 INFO L214 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-22 02:25:54,625 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-05-22 02:25:54,625 INFO L478 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2021-05-22 02:25:54,743 INFO L149 ThreadInstanceAdder]: Constructed 18 joinOtherThreadTransitions. [2021-05-22 02:25:54,761 INFO L255 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-22 02:25:54,779 INFO L378 AbstractCegarLoop]: Interprodecural is true [2021-05-22 02:25:54,779 INFO L379 AbstractCegarLoop]: Hoare is false [2021-05-22 02:25:54,779 INFO L380 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-22 02:25:54,779 INFO L381 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-22 02:25:54,779 INFO L382 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-22 02:25:54,779 INFO L383 AbstractCegarLoop]: Difference is false [2021-05-22 02:25:54,779 INFO L384 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-22 02:25:54,779 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-22 02:25:54,789 INFO L100 iNet2FiniteAutomaton]: Start petriNet2FiniteAutomaton. Operand has 66 places, 55 transitions, 182 flow [2021-05-22 02:25:54,831 INFO L122 iNet2FiniteAutomaton]: Finished petriNet2FiniteAutomaton. Result has 447 states, 445 states have (on average 3.7865168539325844) internal successors, (1685), 446 states have internal predecessors, (1685), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:54,834 INFO L276 IsEmpty]: Start isEmpty. Operand has 447 states, 445 states have (on average 3.7865168539325844) internal successors, (1685), 446 states have internal predecessors, (1685), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:54,855 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-05-22 02:25:54,855 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:54,856 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, 1, 1] [2021-05-22 02:25:54,857 INFO L430 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:54,865 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:54,865 INFO L82 PathProgramCache]: Analyzing trace with hash 1598114992, now seen corresponding path program 1 times [2021-05-22 02:25:54,872 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:54,874 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [779868979] [2021-05-22 02:25:54,874 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:54,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:55,150 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:55,151 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:55,151 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [779868979] [2021-05-22 02:25:55,151 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [779868979] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-22 02:25:55,152 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-22 02:25:55,152 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-22 02:25:55,153 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [272256289] [2021-05-22 02:25:55,156 INFO L462 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-22 02:25:55,156 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:55,170 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-22 02:25:55,171 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-22 02:25:55,174 INFO L87 Difference]: Start difference. First operand has 447 states, 445 states have (on average 3.7865168539325844) internal successors, (1685), 446 states have internal predecessors, (1685), 0 states have call successors, (0), 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 5 states, 5 states have (on average 5.0) internal successors, (25), 4 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:55,306 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:55,307 INFO L93 Difference]: Finished difference Result 893 states and 3368 transitions. [2021-05-22 02:25:55,307 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-22 02:25:55,309 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 5.0) internal successors, (25), 4 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 25 [2021-05-22 02:25:55,309 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:55,335 INFO L225 Difference]: With dead ends: 893 [2021-05-22 02:25:55,336 INFO L226 Difference]: Without dead ends: 874 [2021-05-22 02:25:55,337 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 89.5ms TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-22 02:25:55,355 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 874 states. [2021-05-22 02:25:55,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 874 to 598. [2021-05-22 02:25:55,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 598 states, 597 states have (on average 3.809045226130653) internal successors, (2274), 597 states have internal predecessors, (2274), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:55,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 598 states to 598 states and 2274 transitions. [2021-05-22 02:25:55,437 INFO L78 Accepts]: Start accepts. Automaton has 598 states and 2274 transitions. Word has length 25 [2021-05-22 02:25:55,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:55,438 INFO L482 AbstractCegarLoop]: Abstraction has 598 states and 2274 transitions. [2021-05-22 02:25:55,438 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 5.0) internal successors, (25), 4 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:55,438 INFO L276 IsEmpty]: Start isEmpty. Operand 598 states and 2274 transitions. [2021-05-22 02:25:55,441 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-05-22 02:25:55,441 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:55,441 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, 1, 1] [2021-05-22 02:25:55,441 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-22 02:25:55,442 INFO L430 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:55,445 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:55,445 INFO L82 PathProgramCache]: Analyzing trace with hash -841782840, now seen corresponding path program 2 times [2021-05-22 02:25:55,445 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:55,445 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1383239382] [2021-05-22 02:25:55,445 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:55,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:55,571 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:55,571 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:55,571 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1383239382] [2021-05-22 02:25:55,572 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1383239382] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-22 02:25:55,572 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-22 02:25:55,573 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-22 02:25:55,573 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1722059375] [2021-05-22 02:25:55,574 INFO L462 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-22 02:25:55,575 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:55,577 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-22 02:25:55,577 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-22 02:25:55,577 INFO L87 Difference]: Start difference. First operand 598 states and 2274 transitions. Second operand has 5 states, 5 states have (on average 5.0) internal successors, (25), 4 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:55,658 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:55,658 INFO L93 Difference]: Finished difference Result 872 states and 3319 transitions. [2021-05-22 02:25:55,659 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-22 02:25:55,659 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 5.0) internal successors, (25), 4 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 25 [2021-05-22 02:25:55,660 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:55,669 INFO L225 Difference]: With dead ends: 872 [2021-05-22 02:25:55,669 INFO L226 Difference]: Without dead ends: 841 [2021-05-22 02:25:55,670 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 58.6ms TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-22 02:25:55,674 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 841 states. [2021-05-22 02:25:55,691 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 841 to 596. [2021-05-22 02:25:55,692 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 596 states, 595 states have (on average 3.7663865546218487) internal successors, (2241), 595 states have internal predecessors, (2241), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:55,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 596 states to 596 states and 2241 transitions. [2021-05-22 02:25:55,696 INFO L78 Accepts]: Start accepts. Automaton has 596 states and 2241 transitions. Word has length 25 [2021-05-22 02:25:55,696 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:55,696 INFO L482 AbstractCegarLoop]: Abstraction has 596 states and 2241 transitions. [2021-05-22 02:25:55,696 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 5.0) internal successors, (25), 4 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:55,698 INFO L276 IsEmpty]: Start isEmpty. Operand 596 states and 2241 transitions. [2021-05-22 02:25:55,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-22 02:25:55,700 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:55,700 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, 1, 1, 1, 1] [2021-05-22 02:25:55,700 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-22 02:25:55,701 INFO L430 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:55,701 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:55,701 INFO L82 PathProgramCache]: Analyzing trace with hash -1312476017, now seen corresponding path program 1 times [2021-05-22 02:25:55,702 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:55,702 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [868237870] [2021-05-22 02:25:55,702 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:55,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:55,810 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:55,811 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:55,811 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [868237870] [2021-05-22 02:25:55,812 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [868237870] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:55,814 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1769007263] [2021-05-22 02:25:55,815 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 [2021-05-22 02:25:55,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:55,891 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-22 02:25:55,903 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:56,081 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:56,082 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1769007263] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-22 02:25:56,082 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-05-22 02:25:56,082 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 7 [2021-05-22 02:25:56,082 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [376981537] [2021-05-22 02:25:56,082 INFO L462 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-22 02:25:56,083 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:56,083 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-22 02:25:56,083 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-05-22 02:25:56,083 INFO L87 Difference]: Start difference. First operand 596 states and 2241 transitions. Second operand has 4 states, 4 states have (on average 6.75) internal successors, (27), 3 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:56,124 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:56,124 INFO L93 Difference]: Finished difference Result 867 states and 3197 transitions. [2021-05-22 02:25:56,124 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-22 02:25:56,125 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 6.75) internal successors, (27), 3 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 27 [2021-05-22 02:25:56,125 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:56,130 INFO L225 Difference]: With dead ends: 867 [2021-05-22 02:25:56,130 INFO L226 Difference]: Without dead ends: 836 [2021-05-22 02:25:56,130 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 45.1ms TimeCoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2021-05-22 02:25:56,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 836 states. [2021-05-22 02:25:56,147 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 836 to 734. [2021-05-22 02:25:56,149 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 734 states, 733 states have (on average 3.8663028649386084) internal successors, (2834), 733 states have internal predecessors, (2834), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:56,152 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 734 states to 734 states and 2834 transitions. [2021-05-22 02:25:56,152 INFO L78 Accepts]: Start accepts. Automaton has 734 states and 2834 transitions. Word has length 27 [2021-05-22 02:25:56,153 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:56,153 INFO L482 AbstractCegarLoop]: Abstraction has 734 states and 2834 transitions. [2021-05-22 02:25:56,153 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 6.75) internal successors, (27), 3 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:56,153 INFO L276 IsEmpty]: Start isEmpty. Operand 734 states and 2834 transitions. [2021-05-22 02:25:56,155 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-22 02:25:56,155 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:56,155 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, 1, 1, 1, 1] [2021-05-22 02:25:56,368 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-05-22 02:25:56,369 INFO L430 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:56,369 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:56,369 INFO L82 PathProgramCache]: Analyzing trace with hash 731220239, now seen corresponding path program 2 times [2021-05-22 02:25:56,369 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:56,370 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [236615586] [2021-05-22 02:25:56,370 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:56,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:56,441 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:56,441 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:56,441 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [236615586] [2021-05-22 02:25:56,442 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [236615586] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:56,442 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1166821927] [2021-05-22 02:25:56,442 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 [2021-05-22 02:25:56,498 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:25:56,499 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:25:56,499 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-22 02:25:56,501 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:56,604 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:56,604 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1166821927] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:56,604 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:56,604 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 7 [2021-05-22 02:25:56,604 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [548954045] [2021-05-22 02:25:56,605 INFO L462 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-22 02:25:56,605 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:56,605 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-22 02:25:56,606 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2021-05-22 02:25:56,606 INFO L87 Difference]: Start difference. First operand 734 states and 2834 transitions. Second operand has 8 states, 8 states have (on average 6.125) internal successors, (49), 7 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:56,733 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:56,733 INFO L93 Difference]: Finished difference Result 1660 states and 6252 transitions. [2021-05-22 02:25:56,733 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-22 02:25:56,733 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 6.125) internal successors, (49), 7 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 27 [2021-05-22 02:25:56,734 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:56,744 INFO L225 Difference]: With dead ends: 1660 [2021-05-22 02:25:56,744 INFO L226 Difference]: Without dead ends: 1532 [2021-05-22 02:25:56,744 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 68.8ms TimeCoverageRelationStatistics Valid=45, Invalid=87, Unknown=0, NotChecked=0, Total=132 [2021-05-22 02:25:56,748 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1532 states. [2021-05-22 02:25:56,779 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1532 to 1029. [2021-05-22 02:25:56,783 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1029 states, 1028 states have (on average 4.135214007782102) internal successors, (4251), 1028 states have internal predecessors, (4251), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:56,788 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1029 states to 1029 states and 4251 transitions. [2021-05-22 02:25:56,788 INFO L78 Accepts]: Start accepts. Automaton has 1029 states and 4251 transitions. Word has length 27 [2021-05-22 02:25:56,788 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:56,788 INFO L482 AbstractCegarLoop]: Abstraction has 1029 states and 4251 transitions. [2021-05-22 02:25:56,789 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 6.125) internal successors, (49), 7 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:56,789 INFO L276 IsEmpty]: Start isEmpty. Operand 1029 states and 4251 transitions. [2021-05-22 02:25:56,791 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-22 02:25:56,792 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:56,792 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, 1, 1, 1, 1] [2021-05-22 02:25:56,996 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:56,997 INFO L430 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:56,997 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:56,997 INFO L82 PathProgramCache]: Analyzing trace with hash -700559147, now seen corresponding path program 3 times [2021-05-22 02:25:56,997 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:56,997 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [667631658] [2021-05-22 02:25:56,998 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:57,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:57,038 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:57,038 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:57,039 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [667631658] [2021-05-22 02:25:57,039 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [667631658] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:57,039 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [242648114] [2021-05-22 02:25:57,039 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 [2021-05-22 02:25:57,101 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-22 02:25:57,101 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:25:57,102 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-22 02:25:57,103 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:57,168 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:57,168 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [242648114] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-22 02:25:57,168 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-05-22 02:25:57,168 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4] total 7 [2021-05-22 02:25:57,169 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1947520797] [2021-05-22 02:25:57,169 INFO L462 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-22 02:25:57,169 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:57,169 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-22 02:25:57,170 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-05-22 02:25:57,170 INFO L87 Difference]: Start difference. First operand 1029 states and 4251 transitions. Second operand has 5 states, 5 states have (on average 5.4) internal successors, (27), 4 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:57,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:57,226 INFO L93 Difference]: Finished difference Result 1331 states and 5140 transitions. [2021-05-22 02:25:57,227 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-22 02:25:57,227 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 5.4) internal successors, (27), 4 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 27 [2021-05-22 02:25:57,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:57,235 INFO L225 Difference]: With dead ends: 1331 [2021-05-22 02:25:57,236 INFO L226 Difference]: Without dead ends: 1250 [2021-05-22 02:25:57,240 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 28.4ms TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-05-22 02:25:57,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1250 states. [2021-05-22 02:25:57,268 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1250 to 954. [2021-05-22 02:25:57,270 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 954 states, 953 states have (on average 4.074501573976915) internal successors, (3883), 953 states have internal predecessors, (3883), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:57,275 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 954 states to 954 states and 3883 transitions. [2021-05-22 02:25:57,275 INFO L78 Accepts]: Start accepts. Automaton has 954 states and 3883 transitions. Word has length 27 [2021-05-22 02:25:57,276 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:57,276 INFO L482 AbstractCegarLoop]: Abstraction has 954 states and 3883 transitions. [2021-05-22 02:25:57,276 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 5.4) internal successors, (27), 4 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:57,276 INFO L276 IsEmpty]: Start isEmpty. Operand 954 states and 3883 transitions. [2021-05-22 02:25:57,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-22 02:25:57,281 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:57,281 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, 1, 1, 1, 1] [2021-05-22 02:25:57,492 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:57,493 INFO L430 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:57,493 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:57,493 INFO L82 PathProgramCache]: Analyzing trace with hash -1769205167, now seen corresponding path program 1 times [2021-05-22 02:25:57,493 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:57,494 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1298193162] [2021-05-22 02:25:57,494 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:57,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:57,546 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:57,546 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:57,547 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1298193162] [2021-05-22 02:25:57,547 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1298193162] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:57,547 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1724688383] [2021-05-22 02:25:57,547 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:57,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:57,603 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-22 02:25:57,604 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:57,699 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:57,700 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1724688383] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:57,700 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:57,700 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 3] total 6 [2021-05-22 02:25:57,700 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [720663289] [2021-05-22 02:25:57,700 INFO L462 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-22 02:25:57,700 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:57,701 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-22 02:25:57,701 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-05-22 02:25:57,701 INFO L87 Difference]: Start difference. First operand 954 states and 3883 transitions. Second operand has 7 states, 7 states have (on average 7.0) internal successors, (49), 6 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:57,777 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:57,778 INFO L93 Difference]: Finished difference Result 1888 states and 7508 transitions. [2021-05-22 02:25:57,778 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-22 02:25:57,778 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 7.0) internal successors, (49), 6 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 27 [2021-05-22 02:25:57,779 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:57,790 INFO L225 Difference]: With dead ends: 1888 [2021-05-22 02:25:57,790 INFO L226 Difference]: Without dead ends: 1828 [2021-05-22 02:25:57,790 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 49.8ms TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-05-22 02:25:57,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1828 states. [2021-05-22 02:25:57,829 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1828 to 1443. [2021-05-22 02:25:57,833 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1443 states, 1442 states have (on average 4.125520110957004) internal successors, (5949), 1442 states have internal predecessors, (5949), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:57,840 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1443 states to 1443 states and 5949 transitions. [2021-05-22 02:25:57,840 INFO L78 Accepts]: Start accepts. Automaton has 1443 states and 5949 transitions. Word has length 27 [2021-05-22 02:25:57,840 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:57,840 INFO L482 AbstractCegarLoop]: Abstraction has 1443 states and 5949 transitions. [2021-05-22 02:25:57,841 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 7.0) internal successors, (49), 6 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:57,841 INFO L276 IsEmpty]: Start isEmpty. Operand 1443 states and 5949 transitions. [2021-05-22 02:25:57,846 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-22 02:25:57,846 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:57,846 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, 1, 1, 1, 1] [2021-05-22 02:25:58,060 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:58,061 INFO L430 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:58,061 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:58,061 INFO L82 PathProgramCache]: Analyzing trace with hash 55195285, now seen corresponding path program 2 times [2021-05-22 02:25:58,061 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:58,061 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1727442967] [2021-05-22 02:25:58,061 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:58,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:58,084 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:58,084 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:58,084 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1727442967] [2021-05-22 02:25:58,084 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1727442967] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-22 02:25:58,084 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-22 02:25:58,084 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-22 02:25:58,084 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1456563592] [2021-05-22 02:25:58,085 INFO L462 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-22 02:25:58,085 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:58,085 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-22 02:25:58,085 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-22 02:25:58,085 INFO L87 Difference]: Start difference. First operand 1443 states and 5949 transitions. Second operand has 4 states, 4 states have (on average 6.75) internal successors, (27), 3 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:58,117 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:58,117 INFO L93 Difference]: Finished difference Result 1479 states and 6007 transitions. [2021-05-22 02:25:58,117 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-22 02:25:58,117 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 6.75) internal successors, (27), 3 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 27 [2021-05-22 02:25:58,117 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:58,126 INFO L225 Difference]: With dead ends: 1479 [2021-05-22 02:25:58,126 INFO L226 Difference]: Without dead ends: 1437 [2021-05-22 02:25:58,126 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 8.3ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-22 02:25:58,129 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1437 states. [2021-05-22 02:25:58,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1437 to 1422. [2021-05-22 02:25:58,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1422 states, 1421 states have (on average 4.130190007037298) internal successors, (5869), 1421 states have internal predecessors, (5869), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:58,166 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1422 states to 1422 states and 5869 transitions. [2021-05-22 02:25:58,167 INFO L78 Accepts]: Start accepts. Automaton has 1422 states and 5869 transitions. Word has length 27 [2021-05-22 02:25:58,167 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:58,167 INFO L482 AbstractCegarLoop]: Abstraction has 1422 states and 5869 transitions. [2021-05-22 02:25:58,167 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 6.75) internal successors, (27), 3 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:58,167 INFO L276 IsEmpty]: Start isEmpty. Operand 1422 states and 5869 transitions. [2021-05-22 02:25:58,171 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-22 02:25:58,171 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:58,171 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, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:58,171 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-05-22 02:25:58,171 INFO L430 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:58,172 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:58,172 INFO L82 PathProgramCache]: Analyzing trace with hash 1098192368, now seen corresponding path program 1 times [2021-05-22 02:25:58,172 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:58,172 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [108324575] [2021-05-22 02:25:58,172 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:58,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:58,334 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:58,334 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:58,334 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [108324575] [2021-05-22 02:25:58,335 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [108324575] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:58,335 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1884134221] [2021-05-22 02:25:58,335 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:58,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:58,378 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 29 conjunts are in the unsatisfiable core [2021-05-22 02:25:58,380 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:58,550 WARN L348 FreeRefinementEngine]: Global settings require throwing the following exception [2021-05-22 02:25:58,774 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:58,775 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$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-05-22 02:25:58,778 INFO L168 Benchmark]: Toolchain (without parser) took 4512.61 ms. Allocated memory is still 371.2 MB. Free memory was 350.1 MB in the beginning and 196.9 MB in the end (delta: 153.2 MB). Peak memory consumption was 153.8 MB. Max. memory is 16.0 GB. [2021-05-22 02:25:58,778 INFO L168 Benchmark]: Boogie PL CUP Parser took 0.12 ms. Allocated memory is still 371.2 MB. Free memory is still 351.4 MB. There was no memory consumed. Max. memory is 16.0 GB. [2021-05-22 02:25:58,778 INFO L168 Benchmark]: Boogie Procedure Inliner took 24.69 ms. Allocated memory is still 371.2 MB. Free memory was 350.1 MB in the beginning and 348.6 MB in the end (delta: 1.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.0 GB. [2021-05-22 02:25:58,778 INFO L168 Benchmark]: Boogie Preprocessor took 28.54 ms. Allocated memory is still 371.2 MB. Free memory was 348.6 MB in the beginning and 347.6 MB in the end (delta: 1.0 MB). There was no memory consumed. Max. memory is 16.0 GB. [2021-05-22 02:25:58,778 INFO L168 Benchmark]: RCFGBuilder took 278.50 ms. Allocated memory is still 371.2 MB. Free memory was 347.5 MB in the beginning and 330.8 MB in the end (delta: 16.7 MB). Peak memory consumption was 16.8 MB. Max. memory is 16.0 GB. [2021-05-22 02:25:58,778 INFO L168 Benchmark]: TraceAbstraction took 4176.29 ms. Allocated memory is still 371.2 MB. Free memory was 330.3 MB in the beginning and 196.9 MB in the end (delta: 133.4 MB). Peak memory consumption was 135.0 MB. Max. memory is 16.0 GB. [2021-05-22 02:25:58,779 INFO L339 ainManager$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 371.2 MB. Free memory is still 351.4 MB. There was no memory consumed. Max. memory is 16.0 GB. * Boogie Procedure Inliner took 24.69 ms. Allocated memory is still 371.2 MB. Free memory was 350.1 MB in the beginning and 348.6 MB in the end (delta: 1.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.0 GB. * Boogie Preprocessor took 28.54 ms. Allocated memory is still 371.2 MB. Free memory was 348.6 MB in the beginning and 347.6 MB in the end (delta: 1.0 MB). There was no memory consumed. Max. memory is 16.0 GB. * RCFGBuilder took 278.50 ms. Allocated memory is still 371.2 MB. Free memory was 347.5 MB in the beginning and 330.8 MB in the end (delta: 16.7 MB). Peak memory consumption was 16.8 MB. Max. memory is 16.0 GB. * TraceAbstraction took 4176.29 ms. Allocated memory is still 371.2 MB. Free memory was 330.3 MB in the beginning and 196.9 MB in the end (delta: 133.4 MB). Peak memory consumption was 135.0 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...