/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/popl20-bad/buffer-mult-alt.wvr.bpl -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-770125f [2021-05-22 02:49:19,271 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-22 02:49:19,273 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-22 02:49:19,299 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-22 02:49:19,327 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-22 02:49:19,328 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-22 02:49:19,328 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-22 02:49:19,329 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 02:49:19,367 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-22 02:49:19,367 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-22 02:49:19,368 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-05-22 02:49:19,368 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-05-22 02:49:19,369 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-22 02:49:19,369 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-22 02:49:19,369 INFO L138 SettingsManager]: * Use SBE=true [2021-05-22 02:49:19,369 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-22 02:49:19,370 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-22 02:49:19,370 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-22 02:49:19,370 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-22 02:49:19,370 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-22 02:49:19,370 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-22 02:49:19,371 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-22 02:49:19,371 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-22 02:49:19,371 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-22 02:49:19,371 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-22 02:49:19,371 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-22 02:49:19,372 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-22 02:49:19,372 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-22 02:49:19,372 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-22 02:49:19,372 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-22 02:49:19,372 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-22 02:49:19,372 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-22 02:49:19,373 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-22 02:49:19,373 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-22 02:49:19,373 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-22 02:49:19,373 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-22 02:49:19,373 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-22 02:49:19,374 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-05-22 02:49:19,374 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-22 02:49:19,374 INFO L138 SettingsManager]: * Check the insufficient thread errors last=true [2021-05-22 02:49:19,374 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-05-22 02:49:19,645 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-22 02:49:19,662 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-22 02:49:19,664 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-22 02:49:19,665 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2021-05-22 02:49:19,667 INFO L275 PluginConnector]: Boogie PL CUP Parser initialized [2021-05-22 02:49:19,667 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/weaver-benchmarks/generated/popl20-bad/buffer-mult-alt.wvr.bpl [2021-05-22 02:49:19,688 INFO L110 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/weaver-benchmarks/generated/popl20-bad/buffer-mult-alt.wvr.bpl' [2021-05-22 02:49:19,710 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-22 02:49:19,711 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-22 02:49:19,714 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-05-22 02:49:19,714 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-05-22 02:49:19,714 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-05-22 02:49:19,723 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "buffer-mult-alt.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 22.05 02:49:19" (1/1) ... [2021-05-22 02:49:19,729 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "buffer-mult-alt.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 22.05 02:49:19" (1/1) ... [2021-05-22 02:49:19,735 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-05-22 02:49:19,737 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-22 02:49:19,737 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-22 02:49:19,737 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-22 02:49:19,742 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "buffer-mult-alt.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 22.05 02:49:19" (1/1) ... [2021-05-22 02:49:19,743 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "buffer-mult-alt.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 22.05 02:49:19" (1/1) ... [2021-05-22 02:49:19,743 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "buffer-mult-alt.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 22.05 02:49:19" (1/1) ... [2021-05-22 02:49:19,744 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "buffer-mult-alt.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 22.05 02:49:19" (1/1) ... [2021-05-22 02:49:19,746 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "buffer-mult-alt.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 22.05 02:49:19" (1/1) ... [2021-05-22 02:49:19,749 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "buffer-mult-alt.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 22.05 02:49:19" (1/1) ... [2021-05-22 02:49:19,750 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "buffer-mult-alt.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 22.05 02:49:19" (1/1) ... [2021-05-22 02:49:19,751 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-22 02:49:19,752 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-22 02:49:19,752 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-22 02:49:19,752 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-22 02:49:19,753 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "buffer-mult-alt.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 22.05 02:49:19" (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 02:49:19,816 INFO L124 BoogieDeclarations]: Specification and implementation of procedure thread1 given in one single declaration [2021-05-22 02:49:19,816 INFO L130 BoogieDeclarations]: Found specification of procedure thread1 [2021-05-22 02:49:19,816 INFO L138 BoogieDeclarations]: Found implementation of procedure thread1 [2021-05-22 02:49:19,817 INFO L124 BoogieDeclarations]: Specification and implementation of procedure thread2 given in one single declaration [2021-05-22 02:49:19,817 INFO L130 BoogieDeclarations]: Found specification of procedure thread2 [2021-05-22 02:49:19,817 INFO L138 BoogieDeclarations]: Found implementation of procedure thread2 [2021-05-22 02:49:19,817 INFO L124 BoogieDeclarations]: Specification and implementation of procedure ULTIMATE.start given in one single declaration [2021-05-22 02:49:19,817 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-22 02:49:19,817 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-22 02:49:19,818 INFO L124 BoogieDeclarations]: Specification and implementation of procedure thread3 given in one single declaration [2021-05-22 02:49:19,818 INFO L130 BoogieDeclarations]: Found specification of procedure thread3 [2021-05-22 02:49:19,818 INFO L138 BoogieDeclarations]: Found implementation of procedure thread3 [2021-05-22 02:49:19,818 INFO L124 BoogieDeclarations]: Specification and implementation of procedure thread4 given in one single declaration [2021-05-22 02:49:19,818 INFO L130 BoogieDeclarations]: Found specification of procedure thread4 [2021-05-22 02:49:19,818 INFO L138 BoogieDeclarations]: Found implementation of procedure thread4 [2021-05-22 02:49:19,819 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 02:49:20,044 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-22 02:49:20,045 INFO L299 CfgBuilder]: Removed 0 assume(true) statements. [2021-05-22 02:49:20,046 INFO L202 PluginConnector]: Adding new model buffer-mult-alt.wvr.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.05 02:49:20 BoogieIcfgContainer [2021-05-22 02:49:20,046 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-22 02:49:20,048 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-22 02:49:20,048 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-22 02:49:20,050 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-22 02:49:20,050 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "buffer-mult-alt.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 22.05 02:49:19" (1/2) ... [2021-05-22 02:49:20,051 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@44a37e3a and model type buffer-mult-alt.wvr.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.05 02:49:20, skipping insertion in model container [2021-05-22 02:49:20,051 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "buffer-mult-alt.wvr.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.05 02:49:20" (2/2) ... [2021-05-22 02:49:20,052 INFO L111 eAbstractionObserver]: Analyzing ICFG buffer-mult-alt.wvr.bpl [2021-05-22 02:49:20,057 WARN L148 ceAbstractionStarter]: Switching off computation of Hoare annotation because input is a concurrent program [2021-05-22 02:49:20,057 INFO L214 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-22 02:49:20,058 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-05-22 02:49:20,058 INFO L478 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2021-05-22 02:49:20,155 INFO L149 ThreadInstanceAdder]: Constructed 4 joinOtherThreadTransitions. [2021-05-22 02:49:20,177 INFO L255 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-22 02:49:20,193 INFO L378 AbstractCegarLoop]: Interprodecural is true [2021-05-22 02:49:20,209 INFO L379 AbstractCegarLoop]: Hoare is false [2021-05-22 02:49:20,209 INFO L380 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-22 02:49:20,209 INFO L381 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-22 02:49:20,209 INFO L382 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-22 02:49:20,209 INFO L383 AbstractCegarLoop]: Difference is false [2021-05-22 02:49:20,209 INFO L384 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-22 02:49:20,209 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-22 02:49:20,222 INFO L100 iNet2FiniteAutomaton]: Start petriNet2FiniteAutomaton. Operand has 44 places, 35 transitions, 102 flow [2021-05-22 02:49:20,274 INFO L122 iNet2FiniteAutomaton]: Finished petriNet2FiniteAutomaton. Result has 637 states, 635 states have (on average 3.8866141732283466) internal successors, (2468), 636 states have internal predecessors, (2468), 0 states have call successors, (0), 0 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 02:49:20,280 INFO L276 IsEmpty]: Start isEmpty. Operand has 637 states, 635 states have (on average 3.8866141732283466) internal successors, (2468), 636 states have internal predecessors, (2468), 0 states have call successors, (0), 0 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 02:49:20,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-22 02:49:20,296 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:49:20,296 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:49:20,297 INFO L430 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:49:20,301 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:49:20,302 INFO L82 PathProgramCache]: Analyzing trace with hash -1014933584, now seen corresponding path program 1 times [2021-05-22 02:49:20,309 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:49:20,309 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [191986426] [2021-05-22 02:49:20,310 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:49:20,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:49:20,423 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 02:49:20,424 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:49:20,424 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [191986426] [2021-05-22 02:49:20,425 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [191986426] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-22 02:49:20,425 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-22 02:49:20,425 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-05-22 02:49:20,425 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [987244937] [2021-05-22 02:49:20,429 INFO L462 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-22 02:49:20,429 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:49:20,438 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-22 02:49:20,439 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-22 02:49:20,443 INFO L87 Difference]: Start difference. First operand has 637 states, 635 states have (on average 3.8866141732283466) internal successors, (2468), 636 states have internal predecessors, (2468), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 6.333333333333333) internal successors, (19), 2 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:49:20,500 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:49:20,501 INFO L93 Difference]: Finished difference Result 691 states and 2633 transitions. [2021-05-22 02:49:20,501 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-22 02:49:20,502 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 6.333333333333333) internal successors, (19), 2 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2021-05-22 02:49:20,503 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:49:20,524 INFO L225 Difference]: With dead ends: 691 [2021-05-22 02:49:20,524 INFO L226 Difference]: Without dead ends: 691 [2021-05-22 02:49:20,525 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 8.2ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-22 02:49:20,546 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 691 states. [2021-05-22 02:49:20,657 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 691 to 691. [2021-05-22 02:49:20,661 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 691 states, 690 states have (on average 3.815942028985507) internal successors, (2633), 690 states have internal predecessors, (2633), 0 states have call successors, (0), 0 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 02:49:20,675 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 691 states to 691 states and 2633 transitions. [2021-05-22 02:49:20,676 INFO L78 Accepts]: Start accepts. Automaton has 691 states and 2633 transitions. Word has length 19 [2021-05-22 02:49:20,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:49:20,676 INFO L482 AbstractCegarLoop]: Abstraction has 691 states and 2633 transitions. [2021-05-22 02:49:20,677 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 6.333333333333333) internal successors, (19), 2 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:49:20,679 INFO L276 IsEmpty]: Start isEmpty. Operand 691 states and 2633 transitions. [2021-05-22 02:49:20,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-22 02:49:20,683 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:49:20,684 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:49:20,684 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-22 02:49:20,685 INFO L430 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:49:20,689 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:49:20,689 INFO L82 PathProgramCache]: Analyzing trace with hash 810519764, now seen corresponding path program 1 times [2021-05-22 02:49:20,690 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:49:20,691 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [493428961] [2021-05-22 02:49:20,691 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:49:20,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:49:20,777 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 02:49:20,777 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:49:20,778 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [493428961] [2021-05-22 02:49:20,778 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [493428961] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:49:20,778 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [580135694] [2021-05-22 02:49:20,778 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 02:49:20,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:49:20,865 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 3 conjunts are in the unsatisfiable core [2021-05-22 02:49:20,869 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:49:20,985 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 02:49:20,985 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [580135694] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-22 02:49:20,985 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-05-22 02:49:20,985 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 4 [2021-05-22 02:49:20,986 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1298776216] [2021-05-22 02:49:20,987 INFO L462 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-22 02:49:20,987 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:49:20,995 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-22 02:49:20,996 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-22 02:49:20,996 INFO L87 Difference]: Start difference. First operand 691 states and 2633 transitions. Second operand has 4 states, 4 states have (on average 5.5) internal successors, (22), 3 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:49:21,047 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:49:21,047 INFO L93 Difference]: Finished difference Result 1250 states and 4705 transitions. [2021-05-22 02:49:21,048 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-22 02:49:21,048 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 5.5) internal successors, (22), 3 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-05-22 02:49:21,048 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:49:21,072 INFO L225 Difference]: With dead ends: 1250 [2021-05-22 02:49:21,072 INFO L226 Difference]: Without dead ends: 1250 [2021-05-22 02:49:21,074 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 21.4ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-22 02:49:21,081 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1250 states. [2021-05-22 02:49:21,114 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1250 to 815. [2021-05-22 02:49:21,116 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 815 states, 814 states have (on average 3.839066339066339) internal successors, (3125), 814 states have internal predecessors, (3125), 0 states have call successors, (0), 0 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 02:49:21,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 815 states to 815 states and 3125 transitions. [2021-05-22 02:49:21,123 INFO L78 Accepts]: Start accepts. Automaton has 815 states and 3125 transitions. Word has length 22 [2021-05-22 02:49:21,124 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:49:21,124 INFO L482 AbstractCegarLoop]: Abstraction has 815 states and 3125 transitions. [2021-05-22 02:49:21,125 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 5.5) internal successors, (22), 3 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:49:21,125 INFO L276 IsEmpty]: Start isEmpty. Operand 815 states and 3125 transitions. [2021-05-22 02:49:21,128 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-05-22 02:49:21,128 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:49:21,129 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:49:21,349 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-05-22 02:49:21,349 INFO L430 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:49:21,350 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:49:21,350 INFO L82 PathProgramCache]: Analyzing trace with hash 234896854, now seen corresponding path program 1 times [2021-05-22 02:49:21,350 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:49:21,350 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2023800077] [2021-05-22 02:49:21,350 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:49:21,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:49:21,468 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 02:49:21,468 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:49:21,469 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2023800077] [2021-05-22 02:49:21,470 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2023800077] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:49:21,470 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2055406432] [2021-05-22 02:49:21,470 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:49:21,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:49:21,525 INFO L263 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-22 02:49:21,529 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:49:21,644 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-05-22 02:49:21,646 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:49:21,648 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:49:21,648 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:49:21,648 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:11, output treesize:3 [2021-05-22 02:49:21,670 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 02:49:21,671 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2055406432] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:49:21,671 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:49:21,671 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6 [2021-05-22 02:49:21,671 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1334811055] [2021-05-22 02:49:21,671 INFO L462 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-22 02:49:21,671 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:49:21,672 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-22 02:49:21,672 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-05-22 02:49:21,672 INFO L87 Difference]: Start difference. First operand 815 states and 3125 transitions. Second operand has 7 states, 7 states have (on average 5.142857142857143) internal successors, (36), 6 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 02:49:21,771 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:49:21,771 INFO L93 Difference]: Finished difference Result 1934 states and 7455 transitions. [2021-05-22 02:49:21,772 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-22 02:49:21,772 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 5.142857142857143) internal successors, (36), 6 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-05-22 02:49:21,772 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:49:21,785 INFO L225 Difference]: With dead ends: 1934 [2021-05-22 02:49:21,786 INFO L226 Difference]: Without dead ends: 1807 [2021-05-22 02:49:21,786 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 21 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 41.3ms TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-05-22 02:49:21,792 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1807 states. [2021-05-22 02:49:21,847 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1807 to 1306. [2021-05-22 02:49:21,851 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1306 states, 1305 states have (on average 3.8521072796934868) internal successors, (5027), 1305 states have internal predecessors, (5027), 0 states have call successors, (0), 0 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 02:49:21,858 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1306 states to 1306 states and 5027 transitions. [2021-05-22 02:49:21,858 INFO L78 Accepts]: Start accepts. Automaton has 1306 states and 5027 transitions. Word has length 24 [2021-05-22 02:49:21,859 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:49:21,860 INFO L482 AbstractCegarLoop]: Abstraction has 1306 states and 5027 transitions. [2021-05-22 02:49:21,860 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 5.142857142857143) internal successors, (36), 6 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 02:49:21,860 INFO L276 IsEmpty]: Start isEmpty. Operand 1306 states and 5027 transitions. [2021-05-22 02:49:21,864 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-22 02:49:21,864 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:49:21,864 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:49:22,080 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:49:22,081 INFO L430 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:49:22,081 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:49:22,082 INFO L82 PathProgramCache]: Analyzing trace with hash 1112061528, now seen corresponding path program 2 times [2021-05-22 02:49:22,082 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:49:22,082 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2013917103] [2021-05-22 02:49:22,082 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:49:22,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:49:22,145 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:49:22,146 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:49:22,146 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2013917103] [2021-05-22 02:49:22,146 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2013917103] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:49:22,146 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1465464289] [2021-05-22 02:49:22,146 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 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 02:49:22,191 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:49:22,191 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:49:22,192 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-22 02:49:22,193 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:49:22,267 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:49:22,268 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1465464289] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:49:22,268 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:49:22,268 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 3] total 6 [2021-05-22 02:49:22,268 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1422631439] [2021-05-22 02:49:22,269 INFO L462 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-22 02:49:22,269 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:49:22,269 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-22 02:49:22,269 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-05-22 02:49:22,269 INFO L87 Difference]: Start difference. First operand 1306 states and 5027 transitions. Second operand has 7 states, 7 states have (on average 5.571428571428571) internal successors, (39), 6 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:49:22,370 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:49:22,371 INFO L93 Difference]: Finished difference Result 2404 states and 8959 transitions. [2021-05-22 02:49:22,372 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-22 02:49:22,373 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 5.571428571428571) internal successors, (39), 6 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2021-05-22 02:49:22,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:49:22,389 INFO L225 Difference]: With dead ends: 2404 [2021-05-22 02:49:22,389 INFO L226 Difference]: Without dead ends: 2234 [2021-05-22 02:49:22,389 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 41.1ms TimeCoverageRelationStatistics Valid=25, Invalid=31, Unknown=0, NotChecked=0, Total=56 [2021-05-22 02:49:22,395 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2234 states. [2021-05-22 02:49:22,461 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2234 to 1906. [2021-05-22 02:49:22,465 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1906 states, 1905 states have (on average 3.859317585301837) internal successors, (7352), 1905 states have internal predecessors, (7352), 0 states have call successors, (0), 0 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 02:49:22,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1906 states to 1906 states and 7352 transitions. [2021-05-22 02:49:22,475 INFO L78 Accepts]: Start accepts. Automaton has 1906 states and 7352 transitions. Word has length 26 [2021-05-22 02:49:22,475 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:49:22,475 INFO L482 AbstractCegarLoop]: Abstraction has 1906 states and 7352 transitions. [2021-05-22 02:49:22,476 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 5.571428571428571) internal successors, (39), 6 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:49:22,476 INFO L276 IsEmpty]: Start isEmpty. Operand 1906 states and 7352 transitions. [2021-05-22 02:49:22,481 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-22 02:49:22,481 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:49:22,481 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:49:22,696 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:49:22,697 INFO L430 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:49:22,697 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:49:22,697 INFO L82 PathProgramCache]: Analyzing trace with hash 1469512084, now seen corresponding path program 1 times [2021-05-22 02:49:22,698 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:49:22,698 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1615310648] [2021-05-22 02:49:22,698 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:49:22,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:49:22,738 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-22 02:49:22,738 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:49:22,738 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1615310648] [2021-05-22 02:49:22,738 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1615310648] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-22 02:49:22,739 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-22 02:49:22,739 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-22 02:49:22,739 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1627752482] [2021-05-22 02:49:22,739 INFO L462 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-22 02:49:22,739 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:49:22,740 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-22 02:49:22,740 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-05-22 02:49:22,740 INFO L87 Difference]: Start difference. First operand 1906 states and 7352 transitions. Second operand has 4 states, 4 states have (on average 6.5) internal successors, (26), 3 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:49:22,781 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:49:22,782 INFO L93 Difference]: Finished difference Result 3426 states and 12683 transitions. [2021-05-22 02:49:22,782 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-22 02:49:22,782 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 6.5) internal successors, (26), 3 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2021-05-22 02:49:22,782 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:49:22,801 INFO L225 Difference]: With dead ends: 3426 [2021-05-22 02:49:22,801 INFO L226 Difference]: Without dead ends: 3255 [2021-05-22 02:49:22,802 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 7.0ms TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-05-22 02:49:22,809 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3255 states. [2021-05-22 02:49:22,877 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3255 to 2791. [2021-05-22 02:49:22,885 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2791 states, 2790 states have (on average 3.8562724014336918) internal successors, (10759), 2790 states have internal predecessors, (10759), 0 states have call successors, (0), 0 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 02:49:22,900 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2791 states to 2791 states and 10759 transitions. [2021-05-22 02:49:22,901 INFO L78 Accepts]: Start accepts. Automaton has 2791 states and 10759 transitions. Word has length 26 [2021-05-22 02:49:22,902 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:49:22,903 INFO L482 AbstractCegarLoop]: Abstraction has 2791 states and 10759 transitions. [2021-05-22 02:49:22,903 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 6.5) internal successors, (26), 3 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:49:22,903 INFO L276 IsEmpty]: Start isEmpty. Operand 2791 states and 10759 transitions. [2021-05-22 02:49:22,912 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-22 02:49:22,912 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:49:22,912 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:49:22,912 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-05-22 02:49:22,913 INFO L430 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:49:22,913 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:49:22,913 INFO L82 PathProgramCache]: Analyzing trace with hash -1414582092, now seen corresponding path program 3 times [2021-05-22 02:49:22,914 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:49:22,914 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2082467185] [2021-05-22 02:49:22,914 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:49:22,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:49:23,028 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:49:23,029 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:49:23,029 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2082467185] [2021-05-22 02:49:23,029 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2082467185] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:49:23,029 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [834814023] [2021-05-22 02:49:23,029 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:49:23,076 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:49:23,076 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:49:23,077 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-22 02:49:23,079 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:49:23,274 INFO L354 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-05-22 02:49:23,274 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 12 [2021-05-22 02:49:23,281 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:49:23,283 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:49:23,283 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:49:23,283 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:28, output treesize:3 [2021-05-22 02:49:23,319 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:49:23,319 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [834814023] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:49:23,319 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:49:23,320 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 11 [2021-05-22 02:49:23,320 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [853605563] [2021-05-22 02:49:23,320 INFO L462 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-22 02:49:23,320 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:49:23,321 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-22 02:49:23,321 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2021-05-22 02:49:23,321 INFO L87 Difference]: Start difference. First operand 2791 states and 10759 transitions. Second operand has 12 states, 12 states have (on average 4.75) internal successors, (57), 11 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 02:49:23,872 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:49:23,872 INFO L93 Difference]: Finished difference Result 7730 states and 29466 transitions. [2021-05-22 02:49:23,872 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-22 02:49:23,873 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 4.75) internal successors, (57), 11 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) Word has length 29 [2021-05-22 02:49:23,873 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:49:23,925 INFO L225 Difference]: With dead ends: 7730 [2021-05-22 02:49:23,925 INFO L226 Difference]: Without dead ends: 7083 [2021-05-22 02:49:23,926 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 236.9ms TimeCoverageRelationStatistics Valid=81, Invalid=299, Unknown=0, NotChecked=0, Total=380 [2021-05-22 02:49:23,940 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7083 states. [2021-05-22 02:49:24,037 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7083 to 2938. [2021-05-22 02:49:24,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2938 states, 2937 states have (on average 3.892066734763364) internal successors, (11431), 2937 states have internal predecessors, (11431), 0 states have call successors, (0), 0 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 02:49:24,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2938 states to 2938 states and 11431 transitions. [2021-05-22 02:49:24,057 INFO L78 Accepts]: Start accepts. Automaton has 2938 states and 11431 transitions. Word has length 29 [2021-05-22 02:49:24,057 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:49:24,057 INFO L482 AbstractCegarLoop]: Abstraction has 2938 states and 11431 transitions. [2021-05-22 02:49:24,058 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 4.75) internal successors, (57), 11 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 02:49:24,058 INFO L276 IsEmpty]: Start isEmpty. Operand 2938 states and 11431 transitions. [2021-05-22 02:49:24,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-22 02:49:24,068 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:49:24,068 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:49:24,293 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:49:24,293 INFO L430 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:49:24,294 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:49:24,294 INFO L82 PathProgramCache]: Analyzing trace with hash -278300307, now seen corresponding path program 1 times [2021-05-22 02:49:24,294 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:49:24,295 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [888306056] [2021-05-22 02:49:24,295 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:49:24,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:49:24,348 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-22 02:49:24,348 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:49:24,348 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [888306056] [2021-05-22 02:49:24,348 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [888306056] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:49:24,348 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [826741418] [2021-05-22 02:49:24,349 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 02:49:24,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:49:24,381 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 6 conjunts are in the unsatisfiable core [2021-05-22 02:49:24,382 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:49:24,480 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-22 02:49:24,480 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [826741418] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:49:24,480 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:49:24,480 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 7 [2021-05-22 02:49:24,480 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1091537555] [2021-05-22 02:49:24,481 INFO L462 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-22 02:49:24,481 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:49:24,481 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-22 02:49:24,481 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-05-22 02:49:24,481 INFO L87 Difference]: Start difference. First operand 2938 states and 11431 transitions. Second operand has 8 states, 8 states have (on average 4.75) internal successors, (38), 7 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:49:24,791 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:49:24,792 INFO L93 Difference]: Finished difference Result 10521 states and 39058 transitions. [2021-05-22 02:49:24,792 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-22 02:49:24,793 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.75) internal successors, (38), 7 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 29 [2021-05-22 02:49:24,793 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:49:24,833 INFO L225 Difference]: With dead ends: 10521 [2021-05-22 02:49:24,833 INFO L226 Difference]: Without dead ends: 10471 [2021-05-22 02:49:24,833 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 97.1ms TimeCoverageRelationStatistics Valid=84, Invalid=156, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:49:24,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10471 states. [2021-05-22 02:49:25,001 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10471 to 4032. [2021-05-22 02:49:25,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4032 states, 4031 states have (on average 4.0637558918382535) internal successors, (16381), 4031 states have internal predecessors, (16381), 0 states have call successors, (0), 0 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 02:49:25,032 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4032 states to 4032 states and 16381 transitions. [2021-05-22 02:49:25,032 INFO L78 Accepts]: Start accepts. Automaton has 4032 states and 16381 transitions. Word has length 29 [2021-05-22 02:49:25,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:49:25,033 INFO L482 AbstractCegarLoop]: Abstraction has 4032 states and 16381 transitions. [2021-05-22 02:49:25,033 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 4.75) internal successors, (38), 7 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:49:25,033 INFO L276 IsEmpty]: Start isEmpty. Operand 4032 states and 16381 transitions. [2021-05-22 02:49:25,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-22 02:49:25,045 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:49:25,045 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:49:25,260 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-05-22 02:49:25,261 INFO L430 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:49:25,261 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:49:25,261 INFO L82 PathProgramCache]: Analyzing trace with hash -1740155411, now seen corresponding path program 2 times [2021-05-22 02:49:25,261 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:49:25,262 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [117365678] [2021-05-22 02:49:25,262 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:49:25,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:49:25,299 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-22 02:49:25,299 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:49:25,299 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [117365678] [2021-05-22 02:49:25,299 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [117365678] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:49:25,300 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1605899135] [2021-05-22 02:49:25,300 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 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:49:25,342 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:49:25,342 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:49:25,343 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 6 conjunts are in the unsatisfiable core [2021-05-22 02:49:25,344 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:49:25,421 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-22 02:49:25,421 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1605899135] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:49:25,421 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:49:25,421 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 7 [2021-05-22 02:49:25,421 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1529465527] [2021-05-22 02:49:25,422 INFO L462 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-22 02:49:25,422 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:49:25,422 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-22 02:49:25,422 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-05-22 02:49:25,423 INFO L87 Difference]: Start difference. First operand 4032 states and 16381 transitions. Second operand has 8 states, 8 states have (on average 4.625) internal successors, (37), 7 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:49:25,659 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:49:25,659 INFO L93 Difference]: Finished difference Result 9257 states and 34579 transitions. [2021-05-22 02:49:25,659 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-22 02:49:25,659 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.625) internal successors, (37), 7 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 29 [2021-05-22 02:49:25,659 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:49:25,689 INFO L225 Difference]: With dead ends: 9257 [2021-05-22 02:49:25,690 INFO L226 Difference]: Without dead ends: 9257 [2021-05-22 02:49:25,690 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 114.7ms TimeCoverageRelationStatistics Valid=90, Invalid=150, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:49:25,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9257 states. [2021-05-22 02:49:25,827 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9257 to 4377. [2021-05-22 02:49:25,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4377 states, 4376 states have (on average 4.039076782449726) internal successors, (17675), 4376 states have internal predecessors, (17675), 0 states have call successors, (0), 0 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 02:49:25,905 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4377 states to 4377 states and 17675 transitions. [2021-05-22 02:49:25,905 INFO L78 Accepts]: Start accepts. Automaton has 4377 states and 17675 transitions. Word has length 29 [2021-05-22 02:49:25,906 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:49:25,906 INFO L482 AbstractCegarLoop]: Abstraction has 4377 states and 17675 transitions. [2021-05-22 02:49:25,906 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 4.625) internal successors, (37), 7 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:49:25,906 INFO L276 IsEmpty]: Start isEmpty. Operand 4377 states and 17675 transitions. [2021-05-22 02:49:25,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-22 02:49:25,918 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:49:25,918 INFO L521 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:49:26,119 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:49:26,119 INFO L430 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:49:26,119 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:49:26,119 INFO L82 PathProgramCache]: Analyzing trace with hash 805726646, now seen corresponding path program 4 times [2021-05-22 02:49:26,120 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:49:26,120 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1700640794] [2021-05-22 02:49:26,120 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:49:26,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:49:26,215 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 9 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:49:26,215 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:49:26,215 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1700640794] [2021-05-22 02:49:26,215 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1700640794] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:49:26,215 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [265927092] [2021-05-22 02:49:26,215 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 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:49:26,266 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:49:26,266 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:49:26,267 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 6 conjunts are in the unsatisfiable core [2021-05-22 02:49:26,270 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:49:26,336 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 9 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:49:26,336 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [265927092] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:49:26,336 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:49:26,336 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 4] total 8 [2021-05-22 02:49:26,336 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [577928905] [2021-05-22 02:49:26,336 INFO L462 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-22 02:49:26,337 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:49:26,337 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-22 02:49:26,337 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-22 02:49:26,337 INFO L87 Difference]: Start difference. First operand 4377 states and 17675 transitions. Second operand has 9 states, 9 states have (on average 5.111111111111111) internal successors, (46), 8 states have internal predecessors, (46), 0 states have call successors, (0), 0 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 02:49:26,436 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:49:26,436 INFO L93 Difference]: Finished difference Result 8693 states and 34994 transitions. [2021-05-22 02:49:26,436 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:49:26,437 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 5.111111111111111) internal successors, (46), 8 states have internal predecessors, (46), 0 states have call successors, (0), 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 31 [2021-05-22 02:49:26,437 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:49:26,466 INFO L225 Difference]: With dead ends: 8693 [2021-05-22 02:49:26,466 INFO L226 Difference]: Without dead ends: 8349 [2021-05-22 02:49:26,467 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 38.5ms TimeCoverageRelationStatistics Valid=39, Invalid=51, Unknown=0, NotChecked=0, Total=90 [2021-05-22 02:49:26,482 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8349 states. [2021-05-22 02:49:26,630 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8349 to 6935. [2021-05-22 02:49:26,644 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6935 states, 6934 states have (on average 4.129795211998847) internal successors, (28636), 6934 states have internal predecessors, (28636), 0 states have call successors, (0), 0 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 02:49:26,670 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6935 states to 6935 states and 28636 transitions. [2021-05-22 02:49:26,671 INFO L78 Accepts]: Start accepts. Automaton has 6935 states and 28636 transitions. Word has length 31 [2021-05-22 02:49:26,671 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:49:26,671 INFO L482 AbstractCegarLoop]: Abstraction has 6935 states and 28636 transitions. [2021-05-22 02:49:26,671 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 5.111111111111111) internal successors, (46), 8 states have internal predecessors, (46), 0 states have call successors, (0), 0 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 02:49:26,671 INFO L276 IsEmpty]: Start isEmpty. Operand 6935 states and 28636 transitions. [2021-05-22 02:49:26,689 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-05-22 02:49:26,689 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:49:26,689 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:49:26,904 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:49:26,905 INFO L430 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:49:26,905 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:49:26,905 INFO L82 PathProgramCache]: Analyzing trace with hash 2078445969, now seen corresponding path program 3 times [2021-05-22 02:49:26,905 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:49:26,905 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1646780037] [2021-05-22 02:49:26,905 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:49:26,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:49:26,935 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-22 02:49:26,936 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:49:26,936 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1646780037] [2021-05-22 02:49:26,936 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1646780037] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:49:26,936 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1805822355] [2021-05-22 02:49:26,936 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:49:26,994 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:49:26,995 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:49:26,995 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-22 02:49:26,996 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:49:27,045 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 6 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-22 02:49:27,045 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1805822355] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:49:27,045 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:49:27,045 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2021-05-22 02:49:27,046 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1553779855] [2021-05-22 02:49:27,046 INFO L462 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-22 02:49:27,046 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:49:27,046 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-22 02:49:27,046 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-05-22 02:49:27,047 INFO L87 Difference]: Start difference. First operand 6935 states and 28636 transitions. Second operand has 6 states, 6 states have (on average 6.0) internal successors, (36), 5 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 02:49:27,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:49:27,105 INFO L93 Difference]: Finished difference Result 8766 states and 35643 transitions. [2021-05-22 02:49:27,105 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-22 02:49:27,105 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 6.0) internal successors, (36), 5 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 32 [2021-05-22 02:49:27,106 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:49:27,132 INFO L225 Difference]: With dead ends: 8766 [2021-05-22 02:49:27,132 INFO L226 Difference]: Without dead ends: 8766 [2021-05-22 02:49:27,132 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 12.2ms TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-05-22 02:49:27,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8766 states. [2021-05-22 02:49:27,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8766 to 6543. [2021-05-22 02:49:27,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6543 states, 6542 states have (on average 4.076123509630083) internal successors, (26666), 6542 states have internal predecessors, (26666), 0 states have call successors, (0), 0 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 02:49:27,382 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6543 states to 6543 states and 26666 transitions. [2021-05-22 02:49:27,383 INFO L78 Accepts]: Start accepts. Automaton has 6543 states and 26666 transitions. Word has length 32 [2021-05-22 02:49:27,383 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:49:27,383 INFO L482 AbstractCegarLoop]: Abstraction has 6543 states and 26666 transitions. [2021-05-22 02:49:27,383 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 6.0) internal successors, (36), 5 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 02:49:27,383 INFO L276 IsEmpty]: Start isEmpty. Operand 6543 states and 26666 transitions. [2021-05-22 02:49:27,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-22 02:49:27,400 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:49:27,400 INFO L521 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:49:27,616 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-22 02:49:27,617 INFO L430 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:49:27,617 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:49:27,617 INFO L82 PathProgramCache]: Analyzing trace with hash -2103834406, now seen corresponding path program 5 times [2021-05-22 02:49:27,617 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:49:27,617 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [331557459] [2021-05-22 02:49:27,617 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:49:27,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:49:27,808 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:49:27,809 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:49:27,809 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [331557459] [2021-05-22 02:49:27,809 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [331557459] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:49:27,809 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1828676260] [2021-05-22 02:49:27,809 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 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:49:27,856 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-05-22 02:49:27,856 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:49:27,857 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:49:27,858 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:49:28,043 INFO L354 Elim1Store]: treesize reduction 32, result has 3.0 percent of original size [2021-05-22 02:49:28,043 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 36 treesize of output 16 [2021-05-22 02:49:28,045 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:49:28,047 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:49:28,047 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:49:28,047 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:36, output treesize:3 [2021-05-22 02:49:28,076 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:49:28,076 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1828676260] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:49:28,077 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:49:28,077 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 15 [2021-05-22 02:49:28,077 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1780965162] [2021-05-22 02:49:28,077 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:49:28,077 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:49:28,078 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:49:28,078 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=200, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:49:28,078 INFO L87 Difference]: Start difference. First operand 6543 states and 26666 transitions. Second operand has 16 states, 16 states have (on average 4.1875) internal successors, (67), 15 states have internal predecessors, (67), 0 states have call successors, (0), 0 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 02:49:28,651 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:49:28,651 INFO L93 Difference]: Finished difference Result 15514 states and 62640 transitions. [2021-05-22 02:49:28,651 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:49:28,651 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 4.1875) internal successors, (67), 15 states have internal predecessors, (67), 0 states have call successors, (0), 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 34 [2021-05-22 02:49:28,652 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:49:28,698 INFO L225 Difference]: With dead ends: 15514 [2021-05-22 02:49:28,699 INFO L226 Difference]: Without dead ends: 14945 [2021-05-22 02:49:28,700 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 336.6ms TimeCoverageRelationStatistics Valid=77, Invalid=385, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:49:28,728 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14945 states. [2021-05-22 02:49:28,968 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14945 to 6988. [2021-05-22 02:49:28,982 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6988 states, 6987 states have (on average 4.0978960927436665) internal successors, (28632), 6987 states have internal predecessors, (28632), 0 states have call successors, (0), 0 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 02:49:29,009 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6988 states to 6988 states and 28632 transitions. [2021-05-22 02:49:29,009 INFO L78 Accepts]: Start accepts. Automaton has 6988 states and 28632 transitions. Word has length 34 [2021-05-22 02:49:29,011 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:49:29,011 INFO L482 AbstractCegarLoop]: Abstraction has 6988 states and 28632 transitions. [2021-05-22 02:49:29,011 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 4.1875) internal successors, (67), 15 states have internal predecessors, (67), 0 states have call successors, (0), 0 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 02:49:29,011 INFO L276 IsEmpty]: Start isEmpty. Operand 6988 states and 28632 transitions. [2021-05-22 02:49:29,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-22 02:49:29,029 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:49:29,029 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:49:29,243 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:49:29,243 INFO L430 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:49:29,243 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:49:29,243 INFO L82 PathProgramCache]: Analyzing trace with hash -261271277, now seen corresponding path program 4 times [2021-05-22 02:49:29,243 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:49:29,244 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [856120739] [2021-05-22 02:49:29,244 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:49:29,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:49:29,350 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:49:29,350 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:49:29,351 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [856120739] [2021-05-22 02:49:29,351 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [856120739] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:49:29,351 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [79918145] [2021-05-22 02:49:29,351 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:49:29,386 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:49:29,386 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:49:29,387 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:49:29,390 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:49:29,584 INFO L354 Elim1Store]: treesize reduction 9, result has 10.0 percent of original size [2021-05-22 02:49:29,584 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 44 treesize of output 26 [2021-05-22 02:49:29,588 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:49:29,595 INFO L628 ElimStorePlain]: treesize reduction 7, result has 65.0 percent of original size [2021-05-22 02:49:29,596 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:49:29,596 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:44, output treesize:13 [2021-05-22 02:49:29,640 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-05-22 02:49:29,642 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:49:29,643 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:49:29,644 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:49:29,644 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:15, output treesize:5 [2021-05-22 02:49:29,657 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:49:29,658 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [79918145] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:49:29,658 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:49:29,658 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 14 [2021-05-22 02:49:29,658 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [649841652] [2021-05-22 02:49:29,658 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:49:29,658 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:49:29,659 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:49:29,659 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=177, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:49:29,659 INFO L87 Difference]: Start difference. First operand 6988 states and 28632 transitions. Second operand has 15 states, 15 states have (on average 4.2) internal successors, (63), 14 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 02:49:30,382 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:49:30,382 INFO L93 Difference]: Finished difference Result 25400 states and 103218 transitions. [2021-05-22 02:49:30,382 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-22 02:49:30,383 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 4.2) internal successors, (63), 14 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) Word has length 34 [2021-05-22 02:49:30,383 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:49:30,456 INFO L225 Difference]: With dead ends: 25400 [2021-05-22 02:49:30,457 INFO L226 Difference]: Without dead ends: 25281 [2021-05-22 02:49:30,457 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 27 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 303.2ms TimeCoverageRelationStatistics Valid=77, Invalid=429, Unknown=0, NotChecked=0, Total=506 [2021-05-22 02:49:30,493 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25281 states. [2021-05-22 02:49:30,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25281 to 9001. [2021-05-22 02:49:30,889 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9001 states, 9000 states have (on average 4.129111111111111) internal successors, (37162), 9000 states have internal predecessors, (37162), 0 states have call successors, (0), 0 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 02:49:30,922 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9001 states to 9001 states and 37162 transitions. [2021-05-22 02:49:30,922 INFO L78 Accepts]: Start accepts. Automaton has 9001 states and 37162 transitions. Word has length 34 [2021-05-22 02:49:30,922 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:49:30,922 INFO L482 AbstractCegarLoop]: Abstraction has 9001 states and 37162 transitions. [2021-05-22 02:49:30,923 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 4.2) internal successors, (63), 14 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 02:49:30,923 INFO L276 IsEmpty]: Start isEmpty. Operand 9001 states and 37162 transitions. [2021-05-22 02:49:30,945 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-22 02:49:30,945 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:49:30,945 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:49:31,160 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:49:31,161 INFO L430 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:49:31,162 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:49:31,162 INFO L82 PathProgramCache]: Analyzing trace with hash -2139027627, now seen corresponding path program 5 times [2021-05-22 02:49:31,162 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:49:31,162 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [718140598] [2021-05-22 02:49:31,162 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:49:31,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:49:31,316 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:49:31,317 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:49:31,317 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [718140598] [2021-05-22 02:49:31,317 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [718140598] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:49:31,317 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [730604087] [2021-05-22 02:49:31,317 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:49:31,346 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:49:31,346 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:49:31,347 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 24 conjunts are in the unsatisfiable core [2021-05-22 02:49:31,348 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:49:31,491 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-05-22 02:49:31,493 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:49:31,497 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:49:31,498 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:49:31,498 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:41, output treesize:32 [2021-05-22 02:49:31,527 WARN L348 FreeRefinementEngine]: Global settings require throwing the following exception [2021-05-22 02:49:31,732 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-05-22 02:49:31,733 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$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-05-22 02:49:31,735 INFO L168 Benchmark]: Toolchain (without parser) took 12024.31 ms. Allocated memory was 356.5 MB in the beginning and 1.1 GB in the end (delta: 746.6 MB). Free memory was 336.5 MB in the beginning and 801.4 MB in the end (delta: -464.9 MB). Peak memory consumption was 284.3 MB. Max. memory is 16.0 GB. [2021-05-22 02:49:31,735 INFO L168 Benchmark]: Boogie PL CUP Parser took 0.15 ms. Allocated memory is still 356.5 MB. Free memory was 337.8 MB in the beginning and 337.7 MB in the end (delta: 70.9 kB). There was no memory consumed. Max. memory is 16.0 GB. [2021-05-22 02:49:31,736 INFO L168 Benchmark]: Boogie Procedure Inliner took 21.73 ms. Allocated memory is still 356.5 MB. Free memory was 336.5 MB in the beginning and 335.0 MB in the end (delta: 1.5 MB). There was no memory consumed. Max. memory is 16.0 GB. [2021-05-22 02:49:31,736 INFO L168 Benchmark]: Boogie Preprocessor took 14.32 ms. Allocated memory is still 356.5 MB. Free memory was 335.0 MB in the beginning and 334.0 MB in the end (delta: 1.0 MB). There was no memory consumed. Max. memory is 16.0 GB. [2021-05-22 02:49:31,736 INFO L168 Benchmark]: RCFGBuilder took 294.69 ms. Allocated memory is still 356.5 MB. Free memory was 333.9 MB in the beginning and 318.5 MB in the end (delta: 15.4 MB). Peak memory consumption was 18.9 MB. Max. memory is 16.0 GB. [2021-05-22 02:49:31,736 INFO L168 Benchmark]: TraceAbstraction took 11687.20 ms. Allocated memory was 356.5 MB in the beginning and 1.1 GB in the end (delta: 746.6 MB). Free memory was 318.0 MB in the beginning and 801.4 MB in the end (delta: -483.4 MB). Peak memory consumption was 265.4 MB. Max. memory is 16.0 GB. [2021-05-22 02:49:31,736 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * Boogie PL CUP Parser took 0.15 ms. Allocated memory is still 356.5 MB. Free memory was 337.8 MB in the beginning and 337.7 MB in the end (delta: 70.9 kB). There was no memory consumed. Max. memory is 16.0 GB. * Boogie Procedure Inliner took 21.73 ms. Allocated memory is still 356.5 MB. Free memory was 336.5 MB in the beginning and 335.0 MB in the end (delta: 1.5 MB). There was no memory consumed. Max. memory is 16.0 GB. * Boogie Preprocessor took 14.32 ms. Allocated memory is still 356.5 MB. Free memory was 335.0 MB in the beginning and 334.0 MB in the end (delta: 1.0 MB). There was no memory consumed. Max. memory is 16.0 GB. * RCFGBuilder took 294.69 ms. Allocated memory is still 356.5 MB. Free memory was 333.9 MB in the beginning and 318.5 MB in the end (delta: 15.4 MB). Peak memory consumption was 18.9 MB. Max. memory is 16.0 GB. * TraceAbstraction took 11687.20 ms. Allocated memory was 356.5 MB in the beginning and 1.1 GB in the end (delta: 746.6 MB). Free memory was 318.0 MB in the beginning and 801.4 MB in the end (delta: -483.4 MB). Peak memory consumption was 265.4 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...