/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/chl/array-int-symm.wvr.bpl -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-770125f [2021-05-22 02:20:02,473 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-22 02:20:02,475 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-22 02:20:02,505 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-22 02:20:02,547 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 02:20:02,574 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-22 02:20:02,574 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-22 02:20:02,574 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-05-22 02:20:02,574 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-05-22 02:20:02,576 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-22 02:20:02,576 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-22 02:20:02,576 INFO L138 SettingsManager]: * Use SBE=true [2021-05-22 02:20:02,576 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-22 02:20:02,577 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-22 02:20:02,577 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-22 02:20:02,577 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-22 02:20:02,577 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-22 02:20:02,577 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-22 02:20:02,577 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-22 02:20:02,578 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-22 02:20:02,578 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-22 02:20:02,578 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-22 02:20:02,578 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-22 02:20:02,578 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-22 02:20:02,578 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-22 02:20:02,578 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-22 02:20:02,578 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-22 02:20:02,578 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-22 02:20:02,578 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-22 02:20:02,578 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-22 02:20:02,578 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-22 02:20:02,579 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-22 02:20:02,579 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-22 02:20:02,579 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-22 02:20:02,579 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-05-22 02:20:02,579 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-22 02:20:02,579 INFO L138 SettingsManager]: * Check the insufficient thread errors last=true [2021-05-22 02:20:02,579 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-05-22 02:20:02,853 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-22 02:20:02,865 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-22 02:20:02,866 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-22 02:20:02,867 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2021-05-22 02:20:02,868 INFO L275 PluginConnector]: Boogie PL CUP Parser initialized [2021-05-22 02:20:02,868 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/weaver-benchmarks/generated/chl/array-int-symm.wvr.bpl [2021-05-22 02:20:02,870 INFO L110 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/weaver-benchmarks/generated/chl/array-int-symm.wvr.bpl' [2021-05-22 02:20:02,915 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-22 02:20:02,916 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-22 02:20:02,933 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-05-22 02:20:02,933 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-05-22 02:20:02,933 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-05-22 02:20:02,952 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "array-int-symm.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 22.05 02:20:02" (1/1) ... [2021-05-22 02:20:02,962 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "array-int-symm.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 22.05 02:20:02" (1/1) ... [2021-05-22 02:20:02,968 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-05-22 02:20:02,972 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-22 02:20:02,972 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-22 02:20:02,972 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-22 02:20:02,978 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "array-int-symm.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 22.05 02:20:02" (1/1) ... [2021-05-22 02:20:02,978 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "array-int-symm.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 22.05 02:20:02" (1/1) ... [2021-05-22 02:20:02,986 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "array-int-symm.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 22.05 02:20:02" (1/1) ... [2021-05-22 02:20:02,987 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "array-int-symm.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 22.05 02:20:02" (1/1) ... [2021-05-22 02:20:02,993 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "array-int-symm.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 22.05 02:20:02" (1/1) ... [2021-05-22 02:20:02,995 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "array-int-symm.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 22.05 02:20:02" (1/1) ... [2021-05-22 02:20:02,997 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "array-int-symm.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 22.05 02:20:02" (1/1) ... [2021-05-22 02:20:03,003 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-22 02:20:03,021 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-22 02:20:03,021 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-22 02:20:03,021 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-22 02:20:03,022 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "array-int-symm.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 22.05 02:20:02" (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 02:20:03,112 INFO L124 BoogieDeclarations]: Specification and implementation of procedure thread1 given in one single declaration [2021-05-22 02:20:03,123 INFO L130 BoogieDeclarations]: Found specification of procedure thread1 [2021-05-22 02:20:03,124 INFO L138 BoogieDeclarations]: Found implementation of procedure thread1 [2021-05-22 02:20:03,124 INFO L124 BoogieDeclarations]: Specification and implementation of procedure thread2 given in one single declaration [2021-05-22 02:20:03,124 INFO L130 BoogieDeclarations]: Found specification of procedure thread2 [2021-05-22 02:20:03,124 INFO L138 BoogieDeclarations]: Found implementation of procedure thread2 [2021-05-22 02:20:03,124 INFO L124 BoogieDeclarations]: Specification and implementation of procedure ULTIMATE.start given in one single declaration [2021-05-22 02:20:03,124 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-22 02:20:03,124 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-22 02:20:03,125 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 02:20:03,341 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-22 02:20:03,342 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-05-22 02:20:03,342 WARN L327 CfgBuilder]: Unexpected successor node of atomic block begin: thread1EXIT is neither atomic block end nor error location. [2021-05-22 02:20:03,343 WARN L327 CfgBuilder]: Unexpected successor node of atomic block begin: thread2EXIT is neither atomic block end nor error location. [2021-05-22 02:20:03,343 INFO L202 PluginConnector]: Adding new model array-int-symm.wvr.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.05 02:20:03 BoogieIcfgContainer [2021-05-22 02:20:03,343 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-22 02:20:03,345 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-22 02:20:03,345 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-22 02:20:03,347 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-22 02:20:03,347 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "array-int-symm.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 22.05 02:20:02" (1/2) ... [2021-05-22 02:20:03,347 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6d29182 and model type array-int-symm.wvr.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.05 02:20:03, skipping insertion in model container [2021-05-22 02:20:03,348 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "array-int-symm.wvr.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.05 02:20:03" (2/2) ... [2021-05-22 02:20:03,365 INFO L111 eAbstractionObserver]: Analyzing ICFG array-int-symm.wvr.bpl [2021-05-22 02:20:03,369 WARN L148 ceAbstractionStarter]: Switching off computation of Hoare annotation because input is a concurrent program [2021-05-22 02:20:03,369 INFO L214 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-22 02:20:03,369 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-05-22 02:20:03,369 INFO L478 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2021-05-22 02:20:03,388 INFO L149 ThreadInstanceAdder]: Constructed 2 joinOtherThreadTransitions. [2021-05-22 02:20:03,402 INFO L255 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-22 02:20:03,415 INFO L378 AbstractCegarLoop]: Interprodecural is true [2021-05-22 02:20:03,415 INFO L379 AbstractCegarLoop]: Hoare is false [2021-05-22 02:20:03,415 INFO L380 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-22 02:20:03,415 INFO L381 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-22 02:20:03,415 INFO L382 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-22 02:20:03,415 INFO L383 AbstractCegarLoop]: Difference is false [2021-05-22 02:20:03,415 INFO L384 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-22 02:20:03,415 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-22 02:20:03,420 INFO L100 iNet2FiniteAutomaton]: Start petriNet2FiniteAutomaton. Operand has 21 places, 16 transitions, 48 flow [2021-05-22 02:20:03,438 INFO L122 iNet2FiniteAutomaton]: Finished petriNet2FiniteAutomaton. Result has 21 states, 19 states have (on average 1.894736842105263) internal successors, (36), 20 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:20:03,440 INFO L276 IsEmpty]: Start isEmpty. Operand has 21 states, 19 states have (on average 1.894736842105263) internal successors, (36), 20 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:20:03,443 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-05-22 02:20:03,443 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:20:03,444 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:20:03,444 INFO L430 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:20:03,463 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:20:03,464 INFO L82 PathProgramCache]: Analyzing trace with hash -381977242, now seen corresponding path program 1 times [2021-05-22 02:20:03,473 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:20:03,473 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1335828879] [2021-05-22 02:20:03,473 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:20:03,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:20:03,710 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 02:20:03,711 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:20:03,711 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1335828879] [2021-05-22 02:20:03,711 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1335828879] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-22 02:20:03,711 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-22 02:20:03,712 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-22 02:20:03,712 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [546251271] [2021-05-22 02:20:03,715 INFO L462 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-22 02:20:03,715 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:20:03,722 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-22 02:20:03,722 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-22 02:20:03,724 INFO L87 Difference]: Start difference. First operand has 21 states, 19 states have (on average 1.894736842105263) internal successors, (36), 20 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 4 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:20:03,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:20:03,783 INFO L93 Difference]: Finished difference Result 40 states and 72 transitions. [2021-05-22 02:20:03,783 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-22 02:20:03,785 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2021-05-22 02:20:03,785 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:20:03,796 INFO L225 Difference]: With dead ends: 40 [2021-05-22 02:20:03,797 INFO L226 Difference]: Without dead ends: 37 [2021-05-22 02:20:03,798 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 120.1ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-22 02:20:03,809 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-05-22 02:20:03,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 28. [2021-05-22 02:20:03,825 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 27 states have (on average 1.9259259259259258) internal successors, (52), 27 states have internal predecessors, (52), 0 states have call successors, (0), 0 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 02:20:03,827 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 52 transitions. [2021-05-22 02:20:03,828 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 52 transitions. Word has length 10 [2021-05-22 02:20:03,828 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:20:03,828 INFO L482 AbstractCegarLoop]: Abstraction has 28 states and 52 transitions. [2021-05-22 02:20:03,828 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:20:03,828 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 52 transitions. [2021-05-22 02:20:03,829 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-05-22 02:20:03,829 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:20:03,829 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:20:03,830 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-22 02:20:03,830 INFO L430 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:20:03,835 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:20:03,835 INFO L82 PathProgramCache]: Analyzing trace with hash -481455702, now seen corresponding path program 2 times [2021-05-22 02:20:03,835 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:20:03,836 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2035161308] [2021-05-22 02:20:03,836 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:20:03,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:20:03,889 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 02:20:03,890 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:20:03,890 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2035161308] [2021-05-22 02:20:03,890 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2035161308] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-22 02:20:03,890 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-22 02:20:03,890 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-22 02:20:03,890 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1196354153] [2021-05-22 02:20:03,891 INFO L462 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-22 02:20:03,892 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:20:03,892 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-22 02:20:03,892 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-22 02:20:03,893 INFO L87 Difference]: Start difference. First operand 28 states and 52 transitions. Second operand has 4 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:20:03,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:20:03,928 INFO L93 Difference]: Finished difference Result 46 states and 84 transitions. [2021-05-22 02:20:03,928 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-22 02:20:03,929 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2021-05-22 02:20:03,929 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:20:03,929 INFO L225 Difference]: With dead ends: 46 [2021-05-22 02:20:03,930 INFO L226 Difference]: Without dead ends: 43 [2021-05-22 02:20:03,930 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 18.0ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-22 02:20:03,931 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-05-22 02:20:03,933 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 30. [2021-05-22 02:20:03,933 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 29 states have (on average 1.9310344827586208) internal successors, (56), 29 states have internal predecessors, (56), 0 states have call successors, (0), 0 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 02:20:03,934 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 56 transitions. [2021-05-22 02:20:03,934 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 56 transitions. Word has length 10 [2021-05-22 02:20:03,934 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:20:03,934 INFO L482 AbstractCegarLoop]: Abstraction has 30 states and 56 transitions. [2021-05-22 02:20:03,935 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:20:03,935 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 56 transitions. [2021-05-22 02:20:03,935 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-22 02:20:03,935 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:20:03,935 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:20:03,935 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-22 02:20:03,935 INFO L430 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:20:03,936 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:20:03,936 INFO L82 PathProgramCache]: Analyzing trace with hash 1042522380, now seen corresponding path program 1 times [2021-05-22 02:20:03,936 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:20:03,936 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [753824211] [2021-05-22 02:20:03,936 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:20:03,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:20:03,999 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 02:20:04,000 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:20:04,000 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [753824211] [2021-05-22 02:20:04,000 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [753824211] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-22 02:20:04,000 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-22 02:20:04,000 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-22 02:20:04,000 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1663693283] [2021-05-22 02:20:04,001 INFO L462 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-22 02:20:04,001 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:20:04,001 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-22 02:20:04,001 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-22 02:20:04,001 INFO L87 Difference]: Start difference. First operand 30 states and 56 transitions. Second operand has 5 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:20:04,045 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:20:04,046 INFO L93 Difference]: Finished difference Result 41 states and 72 transitions. [2021-05-22 02:20:04,046 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-22 02:20:04,046 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-05-22 02:20:04,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:20:04,047 INFO L225 Difference]: With dead ends: 41 [2021-05-22 02:20:04,047 INFO L226 Difference]: Without dead ends: 36 [2021-05-22 02:20:04,047 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 47.0ms TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-22 02:20:04,048 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-05-22 02:20:04,049 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 27. [2021-05-22 02:20:04,050 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.9230769230769231) internal successors, (50), 26 states have internal predecessors, (50), 0 states have call successors, (0), 0 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 02:20:04,050 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 50 transitions. [2021-05-22 02:20:04,050 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 50 transitions. Word has length 11 [2021-05-22 02:20:04,050 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:20:04,050 INFO L482 AbstractCegarLoop]: Abstraction has 27 states and 50 transitions. [2021-05-22 02:20:04,050 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:20:04,051 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 50 transitions. [2021-05-22 02:20:04,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-22 02:20:04,051 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:20:04,051 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:20:04,051 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-22 02:20:04,051 INFO L430 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:20:04,052 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:20:04,052 INFO L82 PathProgramCache]: Analyzing trace with hash -707752582, now seen corresponding path program 1 times [2021-05-22 02:20:04,052 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:20:04,052 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1123191299] [2021-05-22 02:20:04,052 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:20:04,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:20:04,084 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 02:20:04,085 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:20:04,085 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1123191299] [2021-05-22 02:20:04,085 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1123191299] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:20:04,085 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1807594563] [2021-05-22 02:20:04,085 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 02:20:04,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:20:04,136 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 6 conjunts are in the unsatisfiable core [2021-05-22 02:20:04,138 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:20:04,294 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 02:20:04,294 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1807594563] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:20:04,295 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:20:04,295 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2021-05-22 02:20:04,295 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1844407509] [2021-05-22 02:20:04,295 INFO L462 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-22 02:20:04,295 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:20:04,296 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-22 02:20:04,296 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-22 02:20:04,296 INFO L87 Difference]: Start difference. First operand 27 states and 50 transitions. Second operand has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 6 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:20:04,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:20:04,348 INFO L93 Difference]: Finished difference Result 39 states and 71 transitions. [2021-05-22 02:20:04,349 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-22 02:20:04,349 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 6 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-05-22 02:20:04,349 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:20:04,351 INFO L225 Difference]: With dead ends: 39 [2021-05-22 02:20:04,352 INFO L226 Difference]: Without dead ends: 39 [2021-05-22 02:20:04,352 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 11 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 42.6ms TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-05-22 02:20:04,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-05-22 02:20:04,358 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 28. [2021-05-22 02:20:04,359 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 27 states have (on average 1.962962962962963) internal successors, (53), 27 states have internal predecessors, (53), 0 states have call successors, (0), 0 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 02:20:04,361 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 53 transitions. [2021-05-22 02:20:04,361 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 53 transitions. Word has length 11 [2021-05-22 02:20:04,361 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:20:04,362 INFO L482 AbstractCegarLoop]: Abstraction has 28 states and 53 transitions. [2021-05-22 02:20:04,362 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 6 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:20:04,362 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 53 transitions. [2021-05-22 02:20:04,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-22 02:20:04,362 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:20:04,363 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:20:04,576 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:20:04,577 INFO L430 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:20:04,577 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:20:04,577 INFO L82 PathProgramCache]: Analyzing trace with hash -742242342, now seen corresponding path program 2 times [2021-05-22 02:20:04,577 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:20:04,578 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1876174387] [2021-05-22 02:20:04,578 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:20:04,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:20:04,643 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 02:20:04,643 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:20:04,643 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1876174387] [2021-05-22 02:20:04,643 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1876174387] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:20:04,643 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1911095998] [2021-05-22 02:20:04,643 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 02:20:04,708 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:20:04,708 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:20:04,709 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 6 conjunts are in the unsatisfiable core [2021-05-22 02:20:04,710 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:20:04,764 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 02:20:04,764 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1911095998] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:20:04,764 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:20:04,764 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 7 [2021-05-22 02:20:04,765 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [626899456] [2021-05-22 02:20:04,765 INFO L462 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-22 02:20:04,765 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:20:04,766 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-22 02:20:04,766 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-05-22 02:20:04,766 INFO L87 Difference]: Start difference. First operand 28 states and 53 transitions. Second operand has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 7 states have internal predecessors, (15), 0 states have call successors, (0), 0 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 02:20:04,808 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:20:04,808 INFO L93 Difference]: Finished difference Result 52 states and 92 transitions. [2021-05-22 02:20:04,808 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-22 02:20:04,808 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 7 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-05-22 02:20:04,809 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:20:04,810 INFO L225 Difference]: With dead ends: 52 [2021-05-22 02:20:04,810 INFO L226 Difference]: Without dead ends: 52 [2021-05-22 02:20:04,811 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 37.1ms TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-05-22 02:20:04,811 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-05-22 02:20:04,816 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 30. [2021-05-22 02:20:04,817 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 29 states have (on average 2.0689655172413794) internal successors, (60), 29 states have internal predecessors, (60), 0 states have call successors, (0), 0 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 02:20:04,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 60 transitions. [2021-05-22 02:20:04,818 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 60 transitions. Word has length 11 [2021-05-22 02:20:04,819 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:20:04,819 INFO L482 AbstractCegarLoop]: Abstraction has 30 states and 60 transitions. [2021-05-22 02:20:04,819 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 7 states have internal predecessors, (15), 0 states have call successors, (0), 0 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 02:20:04,820 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 60 transitions. [2021-05-22 02:20:04,820 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-22 02:20:04,820 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:20:04,820 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:20:05,037 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:20:05,037 INFO L430 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:20:05,038 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:20:05,038 INFO L82 PathProgramCache]: Analyzing trace with hash 59373886, now seen corresponding path program 2 times [2021-05-22 02:20:05,038 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:20:05,038 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [568689467] [2021-05-22 02:20:05,038 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:20:05,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:20:05,103 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 02:20:05,103 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:20:05,103 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [568689467] [2021-05-22 02:20:05,104 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [568689467] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-22 02:20:05,104 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-22 02:20:05,106 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-22 02:20:05,106 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [423646231] [2021-05-22 02:20:05,106 INFO L462 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-22 02:20:05,106 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:20:05,107 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-22 02:20:05,107 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-22 02:20:05,107 INFO L87 Difference]: Start difference. First operand 30 states and 60 transitions. Second operand has 5 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:20:05,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:20:05,143 INFO L93 Difference]: Finished difference Result 42 states and 77 transitions. [2021-05-22 02:20:05,143 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-22 02:20:05,147 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-05-22 02:20:05,147 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:20:05,147 INFO L225 Difference]: With dead ends: 42 [2021-05-22 02:20:05,147 INFO L226 Difference]: Without dead ends: 41 [2021-05-22 02:20:05,148 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 35.7ms TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-22 02:20:05,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-05-22 02:20:05,153 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 32. [2021-05-22 02:20:05,153 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 31 states have (on average 2.064516129032258) internal successors, (64), 31 states have internal predecessors, (64), 0 states have call successors, (0), 0 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 02:20:05,153 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 64 transitions. [2021-05-22 02:20:05,154 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 64 transitions. Word has length 11 [2021-05-22 02:20:05,154 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:20:05,154 INFO L482 AbstractCegarLoop]: Abstraction has 32 states and 64 transitions. [2021-05-22 02:20:05,154 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:20:05,154 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 64 transitions. [2021-05-22 02:20:05,154 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-22 02:20:05,154 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:20:05,154 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:20:05,155 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-05-22 02:20:05,155 INFO L430 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:20:05,155 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:20:05,155 INFO L82 PathProgramCache]: Analyzing trace with hash 865278844, now seen corresponding path program 3 times [2021-05-22 02:20:05,155 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:20:05,156 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1057036837] [2021-05-22 02:20:05,156 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:20:05,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:20:05,181 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 02:20:05,182 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:20:05,182 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1057036837] [2021-05-22 02:20:05,182 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1057036837] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-22 02:20:05,182 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-22 02:20:05,182 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-22 02:20:05,182 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1574350016] [2021-05-22 02:20:05,182 INFO L462 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-22 02:20:05,182 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:20:05,182 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-22 02:20:05,183 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-22 02:20:05,183 INFO L87 Difference]: Start difference. First operand 32 states and 64 transitions. Second operand has 5 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:20:05,214 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:20:05,214 INFO L93 Difference]: Finished difference Result 46 states and 84 transitions. [2021-05-22 02:20:05,214 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-22 02:20:05,214 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-05-22 02:20:05,214 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:20:05,215 INFO L225 Difference]: With dead ends: 46 [2021-05-22 02:20:05,215 INFO L226 Difference]: Without dead ends: 44 [2021-05-22 02:20:05,215 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 23.9ms TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-22 02:20:05,215 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-05-22 02:20:05,216 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 32. [2021-05-22 02:20:05,216 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 31 states have (on average 2.032258064516129) internal successors, (63), 31 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:20:05,217 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 63 transitions. [2021-05-22 02:20:05,217 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 63 transitions. Word has length 11 [2021-05-22 02:20:05,217 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:20:05,217 INFO L482 AbstractCegarLoop]: Abstraction has 32 states and 63 transitions. [2021-05-22 02:20:05,217 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:20:05,217 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 63 transitions. [2021-05-22 02:20:05,217 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-22 02:20:05,217 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:20:05,217 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:20:05,217 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-05-22 02:20:05,217 INFO L430 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:20:05,218 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:20:05,218 INFO L82 PathProgramCache]: Analyzing trace with hash 1777717592, now seen corresponding path program 3 times [2021-05-22 02:20:05,218 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:20:05,218 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1267749733] [2021-05-22 02:20:05,218 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:20:05,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:20:05,262 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 02:20:05,262 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:20:05,262 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1267749733] [2021-05-22 02:20:05,263 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1267749733] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-22 02:20:05,263 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-22 02:20:05,263 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-22 02:20:05,263 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1083576049] [2021-05-22 02:20:05,263 INFO L462 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-22 02:20:05,263 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:20:05,263 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-22 02:20:05,263 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-22 02:20:05,263 INFO L87 Difference]: Start difference. First operand 32 states and 63 transitions. Second operand has 5 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:20:05,316 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:20:05,316 INFO L93 Difference]: Finished difference Result 38 states and 73 transitions. [2021-05-22 02:20:05,316 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-22 02:20:05,316 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-05-22 02:20:05,316 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:20:05,317 INFO L225 Difference]: With dead ends: 38 [2021-05-22 02:20:05,317 INFO L226 Difference]: Without dead ends: 38 [2021-05-22 02:20:05,317 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 42.5ms TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-22 02:20:05,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-05-22 02:20:05,318 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 30. [2021-05-22 02:20:05,318 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 29 states have (on average 2.0) internal successors, (58), 29 states have internal predecessors, (58), 0 states have call successors, (0), 0 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 02:20:05,318 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 58 transitions. [2021-05-22 02:20:05,319 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 58 transitions. Word has length 11 [2021-05-22 02:20:05,319 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:20:05,319 INFO L482 AbstractCegarLoop]: Abstraction has 30 states and 58 transitions. [2021-05-22 02:20:05,319 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:20:05,319 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 58 transitions. [2021-05-22 02:20:05,319 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-22 02:20:05,319 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:20:05,319 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:20:05,319 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-05-22 02:20:05,319 INFO L430 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:20:05,320 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:20:05,320 INFO L82 PathProgramCache]: Analyzing trace with hash 617529826, now seen corresponding path program 4 times [2021-05-22 02:20:05,320 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:20:05,320 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [619093042] [2021-05-22 02:20:05,320 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:20:05,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:20:05,343 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 02:20:05,343 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:20:05,343 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [619093042] [2021-05-22 02:20:05,343 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [619093042] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:20:05,344 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1315440457] [2021-05-22 02:20:05,344 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 02:20:05,366 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:20:05,367 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:20:05,367 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 6 conjunts are in the unsatisfiable core [2021-05-22 02:20:05,367 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:20:05,410 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 02:20:05,410 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1315440457] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:20:05,410 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:20:05,410 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2021-05-22 02:20:05,410 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1411464427] [2021-05-22 02:20:05,411 INFO L462 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-22 02:20:05,411 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:20:05,411 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-22 02:20:05,411 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-22 02:20:05,411 INFO L87 Difference]: Start difference. First operand 30 states and 58 transitions. Second operand has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 6 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:20:05,454 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:20:05,454 INFO L93 Difference]: Finished difference Result 42 states and 78 transitions. [2021-05-22 02:20:05,455 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-22 02:20:05,455 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 6 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-05-22 02:20:05,455 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:20:05,456 INFO L225 Difference]: With dead ends: 42 [2021-05-22 02:20:05,456 INFO L226 Difference]: Without dead ends: 42 [2021-05-22 02:20:05,456 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 10 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 32.9ms TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-05-22 02:20:05,456 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-05-22 02:20:05,461 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 29. [2021-05-22 02:20:05,461 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 28 states have (on average 2.0357142857142856) internal successors, (57), 28 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:20:05,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 57 transitions. [2021-05-22 02:20:05,462 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 57 transitions. Word has length 11 [2021-05-22 02:20:05,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:20:05,462 INFO L482 AbstractCegarLoop]: Abstraction has 29 states and 57 transitions. [2021-05-22 02:20:05,462 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 6 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:20:05,462 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 57 transitions. [2021-05-22 02:20:05,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-22 02:20:05,464 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:20:05,464 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:20:05,683 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:20:05,683 INFO L430 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:20:05,684 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:20:05,684 INFO L82 PathProgramCache]: Analyzing trace with hash -2019919942, now seen corresponding path program 4 times [2021-05-22 02:20:05,684 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:20:05,684 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1741961930] [2021-05-22 02:20:05,684 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:20:05,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:20:05,733 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 02:20:05,733 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:20:05,733 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1741961930] [2021-05-22 02:20:05,733 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1741961930] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-22 02:20:05,733 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-22 02:20:05,733 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-22 02:20:05,733 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1864243425] [2021-05-22 02:20:05,734 INFO L462 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-22 02:20:05,734 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:20:05,734 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-22 02:20:05,734 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-22 02:20:05,735 INFO L87 Difference]: Start difference. First operand 29 states and 57 transitions. Second operand has 5 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:20:05,834 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:20:05,834 INFO L93 Difference]: Finished difference Result 41 states and 74 transitions. [2021-05-22 02:20:05,835 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-22 02:20:05,835 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-05-22 02:20:05,835 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:20:05,835 INFO L225 Difference]: With dead ends: 41 [2021-05-22 02:20:05,835 INFO L226 Difference]: Without dead ends: 39 [2021-05-22 02:20:05,835 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 98.4ms TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-22 02:20:05,836 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-05-22 02:20:05,836 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 29. [2021-05-22 02:20:05,837 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 28 states have (on average 2.0) internal successors, (56), 28 states have internal predecessors, (56), 0 states have call successors, (0), 0 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 02:20:05,837 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 56 transitions. [2021-05-22 02:20:05,837 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 56 transitions. Word has length 11 [2021-05-22 02:20:05,837 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:20:05,837 INFO L482 AbstractCegarLoop]: Abstraction has 29 states and 56 transitions. [2021-05-22 02:20:05,837 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:20:05,837 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 56 transitions. [2021-05-22 02:20:05,837 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-22 02:20:05,837 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:20:05,837 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:20:05,837 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-05-22 02:20:05,838 INFO L430 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:20:05,838 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:20:05,838 INFO L82 PathProgramCache]: Analyzing trace with hash 1491865152, now seen corresponding path program 5 times [2021-05-22 02:20:05,838 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:20:05,838 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [870480076] [2021-05-22 02:20:05,838 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:20:05,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:20:05,858 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 02:20:05,858 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:20:05,859 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [870480076] [2021-05-22 02:20:05,859 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [870480076] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:20:05,859 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [18640198] [2021-05-22 02:20:05,859 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 02:20:05,895 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:20:05,895 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:20:05,896 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 6 conjunts are in the unsatisfiable core [2021-05-22 02:20:05,896 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:20:05,937 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 02:20:05,937 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [18640198] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:20:05,937 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:20:05,937 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 7 [2021-05-22 02:20:05,937 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1700735662] [2021-05-22 02:20:05,937 INFO L462 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-22 02:20:05,937 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:20:05,938 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-22 02:20:05,938 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-05-22 02:20:05,938 INFO L87 Difference]: Start difference. First operand 29 states and 56 transitions. Second operand has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 7 states have internal predecessors, (15), 0 states have call successors, (0), 0 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 02:20:05,969 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:20:05,969 INFO L93 Difference]: Finished difference Result 44 states and 80 transitions. [2021-05-22 02:20:05,969 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-22 02:20:05,970 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 7 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-05-22 02:20:05,970 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:20:05,970 INFO L225 Difference]: With dead ends: 44 [2021-05-22 02:20:05,970 INFO L226 Difference]: Without dead ends: 44 [2021-05-22 02:20:05,970 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 33.6ms TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-05-22 02:20:05,970 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-05-22 02:20:05,971 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 29. [2021-05-22 02:20:05,972 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 28 states have (on average 2.0) internal successors, (56), 28 states have internal predecessors, (56), 0 states have call successors, (0), 0 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 02:20:05,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 56 transitions. [2021-05-22 02:20:05,972 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 56 transitions. Word has length 11 [2021-05-22 02:20:05,972 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:20:05,972 INFO L482 AbstractCegarLoop]: Abstraction has 29 states and 56 transitions. [2021-05-22 02:20:05,972 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 7 states have internal predecessors, (15), 0 states have call successors, (0), 0 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 02:20:05,972 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 56 transitions. [2021-05-22 02:20:05,972 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-22 02:20:05,972 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:20:05,972 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:20:06,181 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:20:06,181 INFO L430 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:20:06,181 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:20:06,182 INFO L82 PathProgramCache]: Analyzing trace with hash -2001485916, now seen corresponding path program 5 times [2021-05-22 02:20:06,182 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:20:06,182 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [880328232] [2021-05-22 02:20:06,182 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:20:06,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:20:06,221 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 02:20:06,221 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:20:06,221 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [880328232] [2021-05-22 02:20:06,221 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [880328232] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-22 02:20:06,221 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-22 02:20:06,221 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-22 02:20:06,221 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [625255911] [2021-05-22 02:20:06,222 INFO L462 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-22 02:20:06,222 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:20:06,222 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-22 02:20:06,222 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-22 02:20:06,222 INFO L87 Difference]: Start difference. First operand 29 states and 56 transitions. Second operand has 5 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:20:06,286 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:20:06,286 INFO L93 Difference]: Finished difference Result 41 states and 73 transitions. [2021-05-22 02:20:06,286 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-22 02:20:06,286 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-05-22 02:20:06,286 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:20:06,287 INFO L225 Difference]: With dead ends: 41 [2021-05-22 02:20:06,287 INFO L226 Difference]: Without dead ends: 40 [2021-05-22 02:20:06,287 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 34.1ms TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-22 02:20:06,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-05-22 02:20:06,288 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 31. [2021-05-22 02:20:06,288 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 30 states have (on average 2.0) internal successors, (60), 30 states have internal predecessors, (60), 0 states have call successors, (0), 0 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 02:20:06,288 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 60 transitions. [2021-05-22 02:20:06,289 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 60 transitions. Word has length 11 [2021-05-22 02:20:06,289 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:20:06,289 INFO L482 AbstractCegarLoop]: Abstraction has 31 states and 60 transitions. [2021-05-22 02:20:06,289 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:20:06,289 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 60 transitions. [2021-05-22 02:20:06,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-22 02:20:06,289 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:20:06,289 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:20:06,289 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-05-22 02:20:06,289 INFO L430 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:20:06,290 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:20:06,290 INFO L82 PathProgramCache]: Analyzing trace with hash -1195580958, now seen corresponding path program 6 times [2021-05-22 02:20:06,290 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:20:06,290 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [206242113] [2021-05-22 02:20:06,290 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:20:06,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:20:06,318 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 02:20:06,318 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:20:06,318 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [206242113] [2021-05-22 02:20:06,318 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [206242113] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-22 02:20:06,318 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-22 02:20:06,319 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-22 02:20:06,319 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [99843973] [2021-05-22 02:20:06,319 INFO L462 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-22 02:20:06,319 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:20:06,319 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-22 02:20:06,320 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-22 02:20:06,320 INFO L87 Difference]: Start difference. First operand 31 states and 60 transitions. Second operand has 5 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:20:06,361 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:20:06,361 INFO L93 Difference]: Finished difference Result 35 states and 65 transitions. [2021-05-22 02:20:06,361 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-22 02:20:06,361 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-05-22 02:20:06,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:20:06,362 INFO L225 Difference]: With dead ends: 35 [2021-05-22 02:20:06,362 INFO L226 Difference]: Without dead ends: 33 [2021-05-22 02:20:06,362 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 31.2ms TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-22 02:20:06,362 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-05-22 02:20:06,363 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 31. [2021-05-22 02:20:06,363 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 30 states have (on average 1.9666666666666666) internal successors, (59), 30 states have internal predecessors, (59), 0 states have call successors, (0), 0 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 02:20:06,363 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 59 transitions. [2021-05-22 02:20:06,363 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 59 transitions. Word has length 11 [2021-05-22 02:20:06,364 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:20:06,364 INFO L482 AbstractCegarLoop]: Abstraction has 31 states and 59 transitions. [2021-05-22 02:20:06,364 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:20:06,364 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 59 transitions. [2021-05-22 02:20:06,364 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-22 02:20:06,364 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:20:06,364 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:20:06,364 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-05-22 02:20:06,364 INFO L430 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:20:06,365 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:20:06,365 INFO L82 PathProgramCache]: Analyzing trace with hash -283142210, now seen corresponding path program 6 times [2021-05-22 02:20:06,365 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:20:06,365 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [870093053] [2021-05-22 02:20:06,365 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:20:06,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:20:06,386 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 02:20:06,386 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:20:06,386 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [870093053] [2021-05-22 02:20:06,386 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [870093053] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-22 02:20:06,387 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-22 02:20:06,387 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-22 02:20:06,387 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [440782583] [2021-05-22 02:20:06,387 INFO L462 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-22 02:20:06,387 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:20:06,387 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-22 02:20:06,387 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-22 02:20:06,388 INFO L87 Difference]: Start difference. First operand 31 states and 59 transitions. Second operand has 5 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:20:06,438 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:20:06,438 INFO L93 Difference]: Finished difference Result 32 states and 60 transitions. [2021-05-22 02:20:06,438 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-22 02:20:06,439 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-05-22 02:20:06,439 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:20:06,439 INFO L225 Difference]: With dead ends: 32 [2021-05-22 02:20:06,439 INFO L226 Difference]: Without dead ends: 32 [2021-05-22 02:20:06,439 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 37.5ms TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-22 02:20:06,439 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-05-22 02:20:06,440 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 28. [2021-05-22 02:20:06,440 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 27 states have (on average 1.9259259259259258) internal successors, (52), 27 states have internal predecessors, (52), 0 states have call successors, (0), 0 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 02:20:06,440 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 52 transitions. [2021-05-22 02:20:06,441 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 52 transitions. Word has length 11 [2021-05-22 02:20:06,441 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:20:06,441 INFO L482 AbstractCegarLoop]: Abstraction has 28 states and 52 transitions. [2021-05-22 02:20:06,441 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:20:06,441 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 52 transitions. [2021-05-22 02:20:06,441 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-22 02:20:06,441 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:20:06,441 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:20:06,441 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-05-22 02:20:06,441 INFO L430 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:20:06,442 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:20:06,442 INFO L82 PathProgramCache]: Analyzing trace with hash -466578568, now seen corresponding path program 1 times [2021-05-22 02:20:06,442 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:20:06,442 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [326843261] [2021-05-22 02:20:06,442 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:20:06,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:20:06,725 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 02:20:06,725 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:20:06,725 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [326843261] [2021-05-22 02:20:06,725 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [326843261] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:20:06,725 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1067722129] [2021-05-22 02:20:06,725 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 02:20:06,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:20:06,789 INFO L263 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-22 02:20:06,790 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:20:06,851 WARN L348 FreeRefinementEngine]: Global settings require throwing the following exception [2021-05-22 02:20:07,066 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-22 02:20:07,067 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$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-05-22 02:20:07,070 INFO L168 Benchmark]: Toolchain (without parser) took 4154.01 ms. Allocated memory was 255.9 MB in the beginning and 341.8 MB in the end (delta: 86.0 MB). Free memory was 235.1 MB in the beginning and 299.7 MB in the end (delta: -64.7 MB). Peak memory consumption was 22.6 MB. Max. memory is 16.0 GB. [2021-05-22 02:20:07,070 INFO L168 Benchmark]: Boogie PL CUP Parser took 0.08 ms. Allocated memory is still 255.9 MB. Free memory is still 236.2 MB. There was no memory consumed. Max. memory is 16.0 GB. [2021-05-22 02:20:07,070 INFO L168 Benchmark]: Boogie Procedure Inliner took 35.44 ms. Allocated memory is still 255.9 MB. Free memory was 235.0 MB in the beginning and 233.5 MB in the end (delta: 1.4 MB). There was no memory consumed. Max. memory is 16.0 GB. [2021-05-22 02:20:07,070 INFO L168 Benchmark]: Boogie Preprocessor took 32.14 ms. Allocated memory is still 255.9 MB. Free memory was 233.5 MB in the beginning and 232.5 MB in the end (delta: 1.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.0 GB. [2021-05-22 02:20:07,070 INFO L168 Benchmark]: RCFGBuilder took 322.95 ms. Allocated memory is still 255.9 MB. Free memory was 232.5 MB in the beginning and 215.4 MB in the end (delta: 17.1 MB). Peak memory consumption was 16.8 MB. Max. memory is 16.0 GB. [2021-05-22 02:20:07,070 INFO L168 Benchmark]: TraceAbstraction took 3724.78 ms. Allocated memory was 255.9 MB in the beginning and 341.8 MB in the end (delta: 86.0 MB). Free memory was 214.9 MB in the beginning and 299.7 MB in the end (delta: -84.8 MB). Peak memory consumption was 3.7 MB. Max. memory is 16.0 GB. [2021-05-22 02:20:07,071 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * Boogie PL CUP Parser took 0.08 ms. Allocated memory is still 255.9 MB. Free memory is still 236.2 MB. There was no memory consumed. Max. memory is 16.0 GB. * Boogie Procedure Inliner took 35.44 ms. Allocated memory is still 255.9 MB. Free memory was 235.0 MB in the beginning and 233.5 MB in the end (delta: 1.4 MB). There was no memory consumed. Max. memory is 16.0 GB. * Boogie Preprocessor took 32.14 ms. Allocated memory is still 255.9 MB. Free memory was 233.5 MB in the beginning and 232.5 MB in the end (delta: 1.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.0 GB. * RCFGBuilder took 322.95 ms. Allocated memory is still 255.9 MB. Free memory was 232.5 MB in the beginning and 215.4 MB in the end (delta: 17.1 MB). Peak memory consumption was 16.8 MB. Max. memory is 16.0 GB. * TraceAbstraction took 3724.78 ms. Allocated memory was 255.9 MB in the beginning and 341.8 MB in the end (delta: 86.0 MB). Free memory was 214.9 MB in the beginning and 299.7 MB in the end (delta: -84.8 MB). Peak memory consumption was 3.7 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...