/usr/bin/java -Xmx16000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -s ../../../trunk/examples/settings/automizer/concurrent/svcomp-Reach-32bit-Automizer_Default-noMmResRef-FA-NoLbe.epf -tc ../../../trunk/examples/toolchains/AutomizerBplInline.xml -i ../../../trunk/examples/concurrent/bpl/weaver-benchmarks/generated/popl20-bad/buffer-mult-alt.wvr.bpl -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-770125f [2021-05-21 21:15:11,212 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-21 21:15:11,215 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-21 21:15:11,251 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-21 21:15:11,298 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-21 21:15:11,298 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-21 21:15:11,299 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-21 21:15:11,303 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/concurrent/svcomp-Reach-32bit-Automizer_Default-noMmResRef-FA-NoLbe.epf [2021-05-21 21:15:11,338 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-21 21:15:11,338 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-21 21:15:11,338 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-05-21 21:15:11,338 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-05-21 21:15:11,341 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-21 21:15:11,341 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-21 21:15:11,341 INFO L138 SettingsManager]: * Use SBE=true [2021-05-21 21:15:11,341 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-21 21:15:11,341 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-21 21:15:11,341 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-21 21:15:11,342 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-21 21:15:11,342 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-21 21:15:11,342 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-21 21:15:11,342 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-21 21:15:11,343 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-21 21:15:11,343 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-21 21:15:11,343 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-21 21:15:11,343 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-21 21:15:11,343 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-21 21:15:11,343 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-21 21:15:11,343 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-21 21:15:11,343 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-21 21:15:11,343 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-21 21:15:11,344 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-21 21:15:11,344 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-21 21:15:11,344 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-21 21:15:11,344 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-21 21:15:11,344 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-21 21:15:11,345 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-21 21:15:11,345 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-05-21 21:15:11,345 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-21 21:15:11,345 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-05-21 21:15:11,684 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-21 21:15:11,701 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-21 21:15:11,703 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-21 21:15:11,704 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2021-05-21 21:15:11,705 INFO L275 PluginConnector]: Boogie PL CUP Parser initialized [2021-05-21 21:15:11,706 INFO L432 ainManager$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 [2021-05-21 21:15:11,717 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' [2021-05-21 21:15:11,740 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-21 21:15:11,741 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-21 21:15:11,742 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-05-21 21:15:11,742 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-05-21 21:15:11,743 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-05-21 21:15:11,754 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 21.05 09:15:11" (1/1) ... [2021-05-21 21:15:11,761 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 21.05 09:15:11" (1/1) ... [2021-05-21 21:15:11,768 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-05-21 21:15:11,770 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-21 21:15:11,770 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-21 21:15:11,770 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-21 21:15:11,777 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 21.05 09:15:11" (1/1) ... [2021-05-21 21:15:11,777 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 21.05 09:15:11" (1/1) ... [2021-05-21 21:15:11,778 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 21.05 09:15:11" (1/1) ... [2021-05-21 21:15:11,779 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 21.05 09:15:11" (1/1) ... [2021-05-21 21:15:11,781 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 21.05 09:15:11" (1/1) ... [2021-05-21 21:15:11,784 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 21.05 09:15:11" (1/1) ... [2021-05-21 21:15:11,785 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 21.05 09:15:11" (1/1) ... [2021-05-21 21:15:11,786 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-21 21:15:11,787 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-21 21:15:11,787 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-21 21:15:11,787 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-21 21:15:11,788 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "buffer-mult-alt.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 21.05 09:15:11" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-21 21:15:11,858 INFO L124 BoogieDeclarations]: Specification and implementation of procedure thread1 given in one single declaration [2021-05-21 21:15:11,859 INFO L130 BoogieDeclarations]: Found specification of procedure thread1 [2021-05-21 21:15:11,859 INFO L138 BoogieDeclarations]: Found implementation of procedure thread1 [2021-05-21 21:15:11,859 INFO L124 BoogieDeclarations]: Specification and implementation of procedure thread2 given in one single declaration [2021-05-21 21:15:11,860 INFO L130 BoogieDeclarations]: Found specification of procedure thread2 [2021-05-21 21:15:11,860 INFO L138 BoogieDeclarations]: Found implementation of procedure thread2 [2021-05-21 21:15:11,860 INFO L124 BoogieDeclarations]: Specification and implementation of procedure ULTIMATE.start given in one single declaration [2021-05-21 21:15:11,860 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-21 21:15:11,860 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-21 21:15:11,860 INFO L124 BoogieDeclarations]: Specification and implementation of procedure thread3 given in one single declaration [2021-05-21 21:15:11,861 INFO L130 BoogieDeclarations]: Found specification of procedure thread3 [2021-05-21 21:15:11,862 INFO L138 BoogieDeclarations]: Found implementation of procedure thread3 [2021-05-21 21:15:11,862 INFO L124 BoogieDeclarations]: Specification and implementation of procedure thread4 given in one single declaration [2021-05-21 21:15:11,862 INFO L130 BoogieDeclarations]: Found specification of procedure thread4 [2021-05-21 21:15:11,862 INFO L138 BoogieDeclarations]: Found implementation of procedure thread4 [2021-05-21 21:15:11,863 WARN L209 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to SingleStatement [2021-05-21 21:15:12,215 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-21 21:15:12,216 INFO L299 CfgBuilder]: Removed 0 assume(true) statements. [2021-05-21 21:15:12,217 INFO L202 PluginConnector]: Adding new model buffer-mult-alt.wvr.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.05 09:15:12 BoogieIcfgContainer [2021-05-21 21:15:12,217 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-21 21:15:12,219 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-21 21:15:12,219 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-21 21:15:12,221 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-21 21:15:12,222 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "buffer-mult-alt.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 21.05 09:15:11" (1/2) ... [2021-05-21 21:15:12,222 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4603d97d and model type buffer-mult-alt.wvr.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.05 09:15:12, skipping insertion in model container [2021-05-21 21:15:12,222 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 21.05 09:15:12" (2/2) ... [2021-05-21 21:15:12,224 INFO L111 eAbstractionObserver]: Analyzing ICFG buffer-mult-alt.wvr.bpl [2021-05-21 21:15:12,228 WARN L148 ceAbstractionStarter]: Switching off computation of Hoare annotation because input is a concurrent program [2021-05-21 21:15:12,229 INFO L214 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-21 21:15:12,229 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-05-21 21:15:12,230 INFO L478 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2021-05-21 21:15:12,281 INFO L149 ThreadInstanceAdder]: Constructed 4 joinOtherThreadTransitions. [2021-05-21 21:15:12,297 INFO L255 AbstractCegarLoop]: Starting to check reachability of 5 error locations. [2021-05-21 21:15:12,312 INFO L378 AbstractCegarLoop]: Interprodecural is true [2021-05-21 21:15:12,312 INFO L379 AbstractCegarLoop]: Hoare is false [2021-05-21 21:15:12,312 INFO L380 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-21 21:15:12,312 INFO L381 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-21 21:15:12,312 INFO L382 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-21 21:15:12,313 INFO L383 AbstractCegarLoop]: Difference is false [2021-05-21 21:15:12,313 INFO L384 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-21 21:15:12,313 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-21 21:15:12,321 INFO L100 iNet2FiniteAutomaton]: Start petriNet2FiniteAutomaton. Operand has 44 places, 35 transitions, 102 flow [2021-05-21 21:15:12,376 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) [2021-05-21 21:15:12,381 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) [2021-05-21 21:15:12,396 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-21 21:15:12,396 INFO L513 BasicCegarLoop]: Found error trace [2021-05-21 21:15:12,397 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-21 21:15:12,397 INFO L430 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr3INUSE_VIOLATION, ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-21 21:15:12,402 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-21 21:15:12,402 INFO L82 PathProgramCache]: Analyzing trace with hash -1014933584, now seen corresponding path program 1 times [2021-05-21 21:15:12,409 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-21 21:15:12,409 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1877980698] [2021-05-21 21:15:12,409 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-21 21:15:12,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 21:15:12,521 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-21 21:15:12,521 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-21 21:15:12,521 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1877980698] [2021-05-21 21:15:12,522 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1877980698] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-21 21:15:12,522 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-21 21:15:12,522 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-05-21 21:15:12,523 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1599442895] [2021-05-21 21:15:12,526 INFO L462 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-21 21:15:12,526 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-21 21:15:12,536 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-21 21:15:12,537 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-21 21:15:12,541 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) [2021-05-21 21:15:12,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-21 21:15:12,607 INFO L93 Difference]: Finished difference Result 691 states and 2633 transitions. [2021-05-21 21:15:12,611 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-21 21:15:12,613 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 [2021-05-21 21:15:12,613 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-21 21:15:12,638 INFO L225 Difference]: With dead ends: 691 [2021-05-21 21:15:12,639 INFO L226 Difference]: Without dead ends: 691 [2021-05-21 21:15:12,640 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 7.6ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-21 21:15:12,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 691 states. [2021-05-21 21:15:12,734 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 691 to 691. [2021-05-21 21:15:12,738 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) [2021-05-21 21:15:12,743 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 691 states to 691 states and 2633 transitions. [2021-05-21 21:15:12,745 INFO L78 Accepts]: Start accepts. Automaton has 691 states and 2633 transitions. Word has length 19 [2021-05-21 21:15:12,745 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-21 21:15:12,745 INFO L482 AbstractCegarLoop]: Abstraction has 691 states and 2633 transitions. [2021-05-21 21:15:12,745 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) [2021-05-21 21:15:12,745 INFO L276 IsEmpty]: Start isEmpty. Operand 691 states and 2633 transitions. [2021-05-21 21:15:12,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-21 21:15:12,750 INFO L513 BasicCegarLoop]: Found error trace [2021-05-21 21:15:12,750 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] [2021-05-21 21:15:12,751 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-21 21:15:12,752 INFO L430 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr3INUSE_VIOLATION, ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-21 21:15:12,755 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-21 21:15:12,755 INFO L82 PathProgramCache]: Analyzing trace with hash 810519764, now seen corresponding path program 1 times [2021-05-21 21:15:12,756 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-21 21:15:12,757 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1704148924] [2021-05-21 21:15:12,757 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-21 21:15:12,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 21:15:12,846 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-21 21:15:12,846 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-21 21:15:12,846 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1704148924] [2021-05-21 21:15:12,847 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1704148924] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 21:15:12,847 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [460954034] [2021-05-21 21:15:12,847 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-21 21:15:12,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 21:15:12,925 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 3 conjunts are in the unsatisfiable core [2021-05-21 21:15:12,929 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-21 21:15:13,091 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-21 21:15:13,091 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [460954034] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-21 21:15:13,091 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-05-21 21:15:13,091 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 4 [2021-05-21 21:15:13,092 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [197432325] [2021-05-21 21:15:13,093 INFO L462 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-21 21:15:13,093 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-21 21:15:13,094 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-21 21:15:13,094 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-21 21:15:13,097 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) [2021-05-21 21:15:13,140 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-21 21:15:13,140 INFO L93 Difference]: Finished difference Result 1250 states and 4705 transitions. [2021-05-21 21:15:13,141 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-21 21:15:13,141 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 [2021-05-21 21:15:13,141 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-21 21:15:13,150 INFO L225 Difference]: With dead ends: 1250 [2021-05-21 21:15:13,150 INFO L226 Difference]: Without dead ends: 1250 [2021-05-21 21:15:13,151 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 18.2ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-21 21:15:13,159 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1250 states. [2021-05-21 21:15:13,182 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1250 to 815. [2021-05-21 21:15:13,184 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) [2021-05-21 21:15:13,188 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 815 states to 815 states and 3125 transitions. [2021-05-21 21:15:13,189 INFO L78 Accepts]: Start accepts. Automaton has 815 states and 3125 transitions. Word has length 22 [2021-05-21 21:15:13,189 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-21 21:15:13,189 INFO L482 AbstractCegarLoop]: Abstraction has 815 states and 3125 transitions. [2021-05-21 21:15:13,189 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) [2021-05-21 21:15:13,189 INFO L276 IsEmpty]: Start isEmpty. Operand 815 states and 3125 transitions. [2021-05-21 21:15:13,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-05-21 21:15:13,192 INFO L513 BasicCegarLoop]: Found error trace [2021-05-21 21:15:13,192 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] [2021-05-21 21:15:13,416 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-05-21 21:15:13,416 INFO L430 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr3INUSE_VIOLATION, ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-21 21:15:13,417 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-21 21:15:13,417 INFO L82 PathProgramCache]: Analyzing trace with hash 234896854, now seen corresponding path program 1 times [2021-05-21 21:15:13,417 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-21 21:15:13,417 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1492424342] [2021-05-21 21:15:13,417 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-21 21:15:13,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 21:15:13,539 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-21 21:15:13,545 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-21 21:15:13,545 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1492424342] [2021-05-21 21:15:13,545 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1492424342] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 21:15:13,545 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1367838437] [2021-05-21 21:15:13,545 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 [2021-05-21 21:15:13,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 21:15:13,594 INFO L263 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-21 21:15:13,595 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-21 21:15:13,686 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-05-21 21:15:13,689 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-21 21:15:13,690 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-21 21:15:13,691 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-21 21:15:13,691 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:11, output treesize:3 [2021-05-21 21:15:13,715 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-21 21:15:13,715 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1367838437] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 21:15:13,715 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-21 21:15:13,715 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6 [2021-05-21 21:15:13,716 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1285367398] [2021-05-21 21:15:13,716 INFO L462 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-21 21:15:13,716 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-21 21:15:13,717 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-21 21:15:13,717 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-05-21 21:15:13,717 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) [2021-05-21 21:15:13,792 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-21 21:15:13,792 INFO L93 Difference]: Finished difference Result 1934 states and 7455 transitions. [2021-05-21 21:15:13,792 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-21 21:15:13,793 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 [2021-05-21 21:15:13,793 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-21 21:15:13,804 INFO L225 Difference]: With dead ends: 1934 [2021-05-21 21:15:13,804 INFO L226 Difference]: Without dead ends: 1807 [2021-05-21 21:15:13,805 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 21 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 69.8ms TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-05-21 21:15:13,809 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1807 states. [2021-05-21 21:15:13,839 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1807 to 1306. [2021-05-21 21:15:13,842 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) [2021-05-21 21:15:13,848 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1306 states to 1306 states and 5027 transitions. [2021-05-21 21:15:13,849 INFO L78 Accepts]: Start accepts. Automaton has 1306 states and 5027 transitions. Word has length 24 [2021-05-21 21:15:13,850 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-21 21:15:13,850 INFO L482 AbstractCegarLoop]: Abstraction has 1306 states and 5027 transitions. [2021-05-21 21:15:13,850 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) [2021-05-21 21:15:13,850 INFO L276 IsEmpty]: Start isEmpty. Operand 1306 states and 5027 transitions. [2021-05-21 21:15:13,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-21 21:15:13,854 INFO L513 BasicCegarLoop]: Found error trace [2021-05-21 21:15:13,854 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] [2021-05-21 21:15:14,078 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-21 21:15:14,078 INFO L430 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr3INUSE_VIOLATION, ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-21 21:15:14,079 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-21 21:15:14,079 INFO L82 PathProgramCache]: Analyzing trace with hash 1112061528, now seen corresponding path program 2 times [2021-05-21 21:15:14,079 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-21 21:15:14,079 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [12662356] [2021-05-21 21:15:14,079 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-21 21:15:14,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 21:15:14,165 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-21 21:15:14,166 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-21 21:15:14,166 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [12662356] [2021-05-21 21:15:14,166 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [12662356] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 21:15:14,166 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1960001322] [2021-05-21 21:15:14,166 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 [2021-05-21 21:15:14,238 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-21 21:15:14,238 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-21 21:15:14,239 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-21 21:15:14,243 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-21 21:15:14,307 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-21 21:15:14,307 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1960001322] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 21:15:14,307 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-21 21:15:14,307 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 3] total 6 [2021-05-21 21:15:14,308 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1575507263] [2021-05-21 21:15:14,308 INFO L462 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-21 21:15:14,308 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-21 21:15:14,309 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-21 21:15:14,309 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-05-21 21:15:14,309 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) [2021-05-21 21:15:14,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-21 21:15:14,403 INFO L93 Difference]: Finished difference Result 2404 states and 8959 transitions. [2021-05-21 21:15:14,403 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-21 21:15:14,404 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 [2021-05-21 21:15:14,406 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-21 21:15:14,421 INFO L225 Difference]: With dead ends: 2404 [2021-05-21 21:15:14,421 INFO L226 Difference]: Without dead ends: 2234 [2021-05-21 21:15:14,421 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 54.3ms TimeCoverageRelationStatistics Valid=25, Invalid=31, Unknown=0, NotChecked=0, Total=56 [2021-05-21 21:15:14,427 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2234 states. [2021-05-21 21:15:14,497 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2234 to 1906. [2021-05-21 21:15:14,502 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) [2021-05-21 21:15:14,512 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1906 states to 1906 states and 7352 transitions. [2021-05-21 21:15:14,512 INFO L78 Accepts]: Start accepts. Automaton has 1906 states and 7352 transitions. Word has length 26 [2021-05-21 21:15:14,512 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-21 21:15:14,512 INFO L482 AbstractCegarLoop]: Abstraction has 1906 states and 7352 transitions. [2021-05-21 21:15:14,513 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) [2021-05-21 21:15:14,513 INFO L276 IsEmpty]: Start isEmpty. Operand 1906 states and 7352 transitions. [2021-05-21 21:15:14,518 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-21 21:15:14,518 INFO L513 BasicCegarLoop]: Found error trace [2021-05-21 21:15:14,519 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] [2021-05-21 21:15:14,742 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-21 21:15:14,743 INFO L430 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr3INUSE_VIOLATION, ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-21 21:15:14,743 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-21 21:15:14,743 INFO L82 PathProgramCache]: Analyzing trace with hash 1469512084, now seen corresponding path program 1 times [2021-05-21 21:15:14,743 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-21 21:15:14,743 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2002381291] [2021-05-21 21:15:14,744 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-21 21:15:14,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 21:15:14,804 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-21 21:15:14,805 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-21 21:15:14,805 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2002381291] [2021-05-21 21:15:14,805 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2002381291] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-21 21:15:14,805 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-21 21:15:14,805 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-21 21:15:14,805 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1589977227] [2021-05-21 21:15:14,806 INFO L462 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-21 21:15:14,806 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-21 21:15:14,806 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-21 21:15:14,806 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-05-21 21:15:14,806 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) [2021-05-21 21:15:14,857 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-21 21:15:14,857 INFO L93 Difference]: Finished difference Result 3426 states and 12683 transitions. [2021-05-21 21:15:14,858 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-21 21:15:14,858 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 [2021-05-21 21:15:14,858 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-21 21:15:14,879 INFO L225 Difference]: With dead ends: 3426 [2021-05-21 21:15:14,880 INFO L226 Difference]: Without dead ends: 3255 [2021-05-21 21:15:14,880 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 9.2ms TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-05-21 21:15:14,887 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3255 states. [2021-05-21 21:15:14,968 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3255 to 2791. [2021-05-21 21:15:14,975 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) [2021-05-21 21:15:14,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2791 states to 2791 states and 10759 transitions. [2021-05-21 21:15:14,991 INFO L78 Accepts]: Start accepts. Automaton has 2791 states and 10759 transitions. Word has length 26 [2021-05-21 21:15:14,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-21 21:15:14,991 INFO L482 AbstractCegarLoop]: Abstraction has 2791 states and 10759 transitions. [2021-05-21 21:15:14,991 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) [2021-05-21 21:15:14,991 INFO L276 IsEmpty]: Start isEmpty. Operand 2791 states and 10759 transitions. [2021-05-21 21:15:15,000 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-21 21:15:15,001 INFO L513 BasicCegarLoop]: Found error trace [2021-05-21 21:15:15,001 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] [2021-05-21 21:15:15,001 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-05-21 21:15:15,001 INFO L430 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr3INUSE_VIOLATION, ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-21 21:15:15,002 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-21 21:15:15,002 INFO L82 PathProgramCache]: Analyzing trace with hash -1414582092, now seen corresponding path program 3 times [2021-05-21 21:15:15,002 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-21 21:15:15,002 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1494615015] [2021-05-21 21:15:15,002 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-21 21:15:15,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 21:15:15,103 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-21 21:15:15,104 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-21 21:15:15,104 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1494615015] [2021-05-21 21:15:15,104 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1494615015] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 21:15:15,104 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [819999398] [2021-05-21 21:15:15,104 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 [2021-05-21 21:15:15,154 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-21 21:15:15,154 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-21 21:15:15,155 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-21 21:15:15,160 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-21 21:15:15,359 INFO L354 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-05-21 21:15:15,359 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 [2021-05-21 21:15:15,366 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-21 21:15:15,368 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-21 21:15:15,368 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-21 21:15:15,369 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:28, output treesize:3 [2021-05-21 21:15:15,394 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-21 21:15:15,395 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [819999398] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 21:15:15,395 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-21 21:15:15,395 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 11 [2021-05-21 21:15:15,395 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1997874317] [2021-05-21 21:15:15,396 INFO L462 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-21 21:15:15,396 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-21 21:15:15,397 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-21 21:15:15,397 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2021-05-21 21:15:15,397 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) [2021-05-21 21:15:15,998 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-21 21:15:15,998 INFO L93 Difference]: Finished difference Result 7730 states and 29466 transitions. [2021-05-21 21:15:15,998 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-21 21:15:15,999 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 [2021-05-21 21:15:15,999 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-21 21:15:16,058 INFO L225 Difference]: With dead ends: 7730 [2021-05-21 21:15:16,058 INFO L226 Difference]: Without dead ends: 7083 [2021-05-21 21:15:16,059 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 261.1ms TimeCoverageRelationStatistics Valid=81, Invalid=299, Unknown=0, NotChecked=0, Total=380 [2021-05-21 21:15:16,076 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7083 states. [2021-05-21 21:15:16,186 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7083 to 2938. [2021-05-21 21:15:16,194 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) [2021-05-21 21:15:16,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2938 states to 2938 states and 11431 transitions. [2021-05-21 21:15:16,209 INFO L78 Accepts]: Start accepts. Automaton has 2938 states and 11431 transitions. Word has length 29 [2021-05-21 21:15:16,209 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-21 21:15:16,209 INFO L482 AbstractCegarLoop]: Abstraction has 2938 states and 11431 transitions. [2021-05-21 21:15:16,210 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) [2021-05-21 21:15:16,210 INFO L276 IsEmpty]: Start isEmpty. Operand 2938 states and 11431 transitions. [2021-05-21 21:15:16,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-21 21:15:16,220 INFO L513 BasicCegarLoop]: Found error trace [2021-05-21 21:15:16,221 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] [2021-05-21 21:15:16,436 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-21 21:15:16,437 INFO L430 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr3INUSE_VIOLATION, ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-21 21:15:16,437 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-21 21:15:16,437 INFO L82 PathProgramCache]: Analyzing trace with hash -278300307, now seen corresponding path program 1 times [2021-05-21 21:15:16,437 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-21 21:15:16,438 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1798793109] [2021-05-21 21:15:16,438 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-21 21:15:16,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 21:15:16,479 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-21 21:15:16,480 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-21 21:15:16,481 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1798793109] [2021-05-21 21:15:16,481 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1798793109] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 21:15:16,481 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1091429469] [2021-05-21 21:15:16,482 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 [2021-05-21 21:15:16,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 21:15:16,522 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 6 conjunts are in the unsatisfiable core [2021-05-21 21:15:16,523 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-21 21:15:16,614 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-21 21:15:16,614 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1091429469] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 21:15:16,614 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-21 21:15:16,615 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 7 [2021-05-21 21:15:16,615 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1904810637] [2021-05-21 21:15:16,616 INFO L462 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-21 21:15:16,616 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-21 21:15:16,616 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-21 21:15:16,617 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-05-21 21:15:16,617 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) [2021-05-21 21:15:16,901 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-21 21:15:16,901 INFO L93 Difference]: Finished difference Result 10521 states and 39058 transitions. [2021-05-21 21:15:16,902 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-21 21:15:16,902 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 [2021-05-21 21:15:16,902 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-21 21:15:16,947 INFO L225 Difference]: With dead ends: 10521 [2021-05-21 21:15:16,947 INFO L226 Difference]: Without dead ends: 10471 [2021-05-21 21:15:16,948 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 108.1ms TimeCoverageRelationStatistics Valid=84, Invalid=156, Unknown=0, NotChecked=0, Total=240 [2021-05-21 21:15:16,969 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10471 states. [2021-05-21 21:15:17,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10471 to 4032. [2021-05-21 21:15:17,155 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) [2021-05-21 21:15:17,172 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4032 states to 4032 states and 16381 transitions. [2021-05-21 21:15:17,172 INFO L78 Accepts]: Start accepts. Automaton has 4032 states and 16381 transitions. Word has length 29 [2021-05-21 21:15:17,172 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-21 21:15:17,172 INFO L482 AbstractCegarLoop]: Abstraction has 4032 states and 16381 transitions. [2021-05-21 21:15:17,172 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) [2021-05-21 21:15:17,173 INFO L276 IsEmpty]: Start isEmpty. Operand 4032 states and 16381 transitions. [2021-05-21 21:15:17,184 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-21 21:15:17,184 INFO L513 BasicCegarLoop]: Found error trace [2021-05-21 21:15:17,184 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] [2021-05-21 21:15:17,385 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-05-21 21:15:17,385 INFO L430 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr3INUSE_VIOLATION, ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-21 21:15:17,385 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-21 21:15:17,386 INFO L82 PathProgramCache]: Analyzing trace with hash -1740155411, now seen corresponding path program 2 times [2021-05-21 21:15:17,386 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-21 21:15:17,386 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [463185513] [2021-05-21 21:15:17,386 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-21 21:15:17,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 21:15:17,418 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-21 21:15:17,419 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-21 21:15:17,419 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [463185513] [2021-05-21 21:15:17,419 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [463185513] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 21:15:17,419 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1914398640] [2021-05-21 21:15:17,419 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 [2021-05-21 21:15:17,473 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-21 21:15:17,473 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-21 21:15:17,474 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 6 conjunts are in the unsatisfiable core [2021-05-21 21:15:17,475 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-21 21:15:17,551 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-21 21:15:17,551 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1914398640] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 21:15:17,551 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-21 21:15:17,551 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 7 [2021-05-21 21:15:17,551 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1199389785] [2021-05-21 21:15:17,551 INFO L462 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-21 21:15:17,552 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-21 21:15:17,552 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-21 21:15:17,552 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-05-21 21:15:17,552 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) [2021-05-21 21:15:17,802 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-21 21:15:17,803 INFO L93 Difference]: Finished difference Result 9257 states and 34579 transitions. [2021-05-21 21:15:17,803 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-21 21:15:17,803 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 [2021-05-21 21:15:17,804 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-21 21:15:17,835 INFO L225 Difference]: With dead ends: 9257 [2021-05-21 21:15:17,835 INFO L226 Difference]: Without dead ends: 9257 [2021-05-21 21:15:17,840 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 115.0ms TimeCoverageRelationStatistics Valid=90, Invalid=150, Unknown=0, NotChecked=0, Total=240 [2021-05-21 21:15:17,858 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9257 states. [2021-05-21 21:15:17,973 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9257 to 4377. [2021-05-21 21:15:17,987 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) [2021-05-21 21:15:18,004 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4377 states to 4377 states and 17675 transitions. [2021-05-21 21:15:18,004 INFO L78 Accepts]: Start accepts. Automaton has 4377 states and 17675 transitions. Word has length 29 [2021-05-21 21:15:18,005 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-21 21:15:18,005 INFO L482 AbstractCegarLoop]: Abstraction has 4377 states and 17675 transitions. [2021-05-21 21:15:18,005 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) [2021-05-21 21:15:18,005 INFO L276 IsEmpty]: Start isEmpty. Operand 4377 states and 17675 transitions. [2021-05-21 21:15:18,016 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-21 21:15:18,016 INFO L513 BasicCegarLoop]: Found error trace [2021-05-21 21:15:18,016 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] [2021-05-21 21:15:18,239 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-21 21:15:18,239 INFO L430 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr3INUSE_VIOLATION, ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-21 21:15:18,239 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-21 21:15:18,239 INFO L82 PathProgramCache]: Analyzing trace with hash 805726646, now seen corresponding path program 4 times [2021-05-21 21:15:18,239 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-21 21:15:18,239 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1393889270] [2021-05-21 21:15:18,240 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-21 21:15:18,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 21:15:18,310 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 9 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-21 21:15:18,310 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-21 21:15:18,310 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1393889270] [2021-05-21 21:15:18,310 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1393889270] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 21:15:18,311 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1652916287] [2021-05-21 21:15:18,311 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 [2021-05-21 21:15:18,365 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-21 21:15:18,366 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-21 21:15:18,367 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 6 conjunts are in the unsatisfiable core [2021-05-21 21:15:18,369 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-21 21:15:18,493 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 9 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-21 21:15:18,494 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1652916287] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 21:15:18,494 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-21 21:15:18,494 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 4] total 8 [2021-05-21 21:15:18,494 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [757834929] [2021-05-21 21:15:18,494 INFO L462 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-21 21:15:18,494 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-21 21:15:18,495 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-21 21:15:18,495 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-21 21:15:18,495 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) [2021-05-21 21:15:18,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-21 21:15:18,603 INFO L93 Difference]: Finished difference Result 8693 states and 34994 transitions. [2021-05-21 21:15:18,604 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-21 21:15:18,604 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 [2021-05-21 21:15:18,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-21 21:15:18,629 INFO L225 Difference]: With dead ends: 8693 [2021-05-21 21:15:18,629 INFO L226 Difference]: Without dead ends: 8349 [2021-05-21 21:15:18,629 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 109.1ms TimeCoverageRelationStatistics Valid=39, Invalid=51, Unknown=0, NotChecked=0, Total=90 [2021-05-21 21:15:18,645 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8349 states. [2021-05-21 21:15:18,796 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8349 to 6935. [2021-05-21 21:15:18,810 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) [2021-05-21 21:15:18,836 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6935 states to 6935 states and 28636 transitions. [2021-05-21 21:15:18,836 INFO L78 Accepts]: Start accepts. Automaton has 6935 states and 28636 transitions. Word has length 31 [2021-05-21 21:15:18,836 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-21 21:15:18,836 INFO L482 AbstractCegarLoop]: Abstraction has 6935 states and 28636 transitions. [2021-05-21 21:15:18,837 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) [2021-05-21 21:15:18,837 INFO L276 IsEmpty]: Start isEmpty. Operand 6935 states and 28636 transitions. [2021-05-21 21:15:18,855 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-05-21 21:15:18,856 INFO L513 BasicCegarLoop]: Found error trace [2021-05-21 21:15:18,856 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] [2021-05-21 21:15:19,068 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-21 21:15:19,069 INFO L430 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr3INUSE_VIOLATION, ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-21 21:15:19,069 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-21 21:15:19,069 INFO L82 PathProgramCache]: Analyzing trace with hash 2078445969, now seen corresponding path program 3 times [2021-05-21 21:15:19,069 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-21 21:15:19,069 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [975332132] [2021-05-21 21:15:19,070 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-21 21:15:19,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 21:15:19,118 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-21 21:15:19,118 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-21 21:15:19,118 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [975332132] [2021-05-21 21:15:19,118 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [975332132] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 21:15:19,118 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1820926122] [2021-05-21 21:15:19,118 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 [2021-05-21 21:15:19,159 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-21 21:15:19,159 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-21 21:15:19,160 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-21 21:15:19,162 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-21 21:15:19,233 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 6 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-21 21:15:19,233 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1820926122] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 21:15:19,233 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-21 21:15:19,234 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2021-05-21 21:15:19,234 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [554372940] [2021-05-21 21:15:19,234 INFO L462 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-21 21:15:19,234 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-21 21:15:19,234 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-21 21:15:19,235 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-05-21 21:15:19,235 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) [2021-05-21 21:15:19,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-21 21:15:19,299 INFO L93 Difference]: Finished difference Result 8766 states and 35643 transitions. [2021-05-21 21:15:19,299 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-21 21:15:19,300 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 [2021-05-21 21:15:19,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-21 21:15:19,327 INFO L225 Difference]: With dead ends: 8766 [2021-05-21 21:15:19,328 INFO L226 Difference]: Without dead ends: 8766 [2021-05-21 21:15:19,328 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 19.9ms TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-05-21 21:15:19,345 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8766 states. [2021-05-21 21:15:19,557 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8766 to 6543. [2021-05-21 21:15:19,569 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) [2021-05-21 21:15:19,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6543 states to 6543 states and 26666 transitions. [2021-05-21 21:15:19,593 INFO L78 Accepts]: Start accepts. Automaton has 6543 states and 26666 transitions. Word has length 32 [2021-05-21 21:15:19,593 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-21 21:15:19,593 INFO L482 AbstractCegarLoop]: Abstraction has 6543 states and 26666 transitions. [2021-05-21 21:15:19,594 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) [2021-05-21 21:15:19,594 INFO L276 IsEmpty]: Start isEmpty. Operand 6543 states and 26666 transitions. [2021-05-21 21:15:19,610 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-21 21:15:19,610 INFO L513 BasicCegarLoop]: Found error trace [2021-05-21 21:15:19,610 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] [2021-05-21 21:15:19,836 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-21 21:15:19,836 INFO L430 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr3INUSE_VIOLATION, ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-21 21:15:19,836 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-21 21:15:19,837 INFO L82 PathProgramCache]: Analyzing trace with hash -2103834406, now seen corresponding path program 5 times [2021-05-21 21:15:19,837 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-21 21:15:19,837 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1754858897] [2021-05-21 21:15:19,837 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-21 21:15:19,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 21:15:20,074 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-21 21:15:20,074 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-21 21:15:20,074 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1754858897] [2021-05-21 21:15:20,075 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1754858897] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 21:15:20,075 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [819769124] [2021-05-21 21:15:20,075 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 [2021-05-21 21:15:20,126 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-05-21 21:15:20,126 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-21 21:15:20,127 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-21 21:15:20,135 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-21 21:15:20,383 INFO L354 Elim1Store]: treesize reduction 32, result has 3.0 percent of original size [2021-05-21 21:15:20,383 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 [2021-05-21 21:15:20,386 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-21 21:15:20,387 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-21 21:15:20,388 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-21 21:15:20,388 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:36, output treesize:3 [2021-05-21 21:15:20,415 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-21 21:15:20,416 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [819769124] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 21:15:20,416 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-21 21:15:20,416 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 15 [2021-05-21 21:15:20,416 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1328764562] [2021-05-21 21:15:20,416 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-21 21:15:20,416 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-21 21:15:20,417 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-21 21:15:20,417 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=200, Unknown=0, NotChecked=0, Total=240 [2021-05-21 21:15:20,417 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) [2021-05-21 21:15:20,994 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-21 21:15:20,995 INFO L93 Difference]: Finished difference Result 15514 states and 62640 transitions. [2021-05-21 21:15:20,995 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-21 21:15:20,995 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 [2021-05-21 21:15:20,995 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-21 21:15:21,043 INFO L225 Difference]: With dead ends: 15514 [2021-05-21 21:15:21,044 INFO L226 Difference]: Without dead ends: 14945 [2021-05-21 21:15:21,044 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 347.3ms TimeCoverageRelationStatistics Valid=77, Invalid=385, Unknown=0, NotChecked=0, Total=462 [2021-05-21 21:15:21,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14945 states. [2021-05-21 21:15:21,278 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14945 to 6988. [2021-05-21 21:15:21,292 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) [2021-05-21 21:15:21,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6988 states to 6988 states and 28632 transitions. [2021-05-21 21:15:21,322 INFO L78 Accepts]: Start accepts. Automaton has 6988 states and 28632 transitions. Word has length 34 [2021-05-21 21:15:21,322 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-21 21:15:21,322 INFO L482 AbstractCegarLoop]: Abstraction has 6988 states and 28632 transitions. [2021-05-21 21:15:21,322 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) [2021-05-21 21:15:21,323 INFO L276 IsEmpty]: Start isEmpty. Operand 6988 states and 28632 transitions. [2021-05-21 21:15:21,383 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-21 21:15:21,383 INFO L513 BasicCegarLoop]: Found error trace [2021-05-21 21:15:21,383 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] [2021-05-21 21:15:21,604 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-21 21:15:21,605 INFO L430 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr3INUSE_VIOLATION, ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-21 21:15:21,605 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-21 21:15:21,605 INFO L82 PathProgramCache]: Analyzing trace with hash -261271277, now seen corresponding path program 4 times [2021-05-21 21:15:21,605 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-21 21:15:21,605 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1666654024] [2021-05-21 21:15:21,605 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-21 21:15:21,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 21:15:21,705 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-21 21:15:21,705 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-21 21:15:21,705 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1666654024] [2021-05-21 21:15:21,705 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1666654024] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 21:15:21,705 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1372664360] [2021-05-21 21:15:21,705 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 [2021-05-21 21:15:21,742 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-21 21:15:21,742 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-21 21:15:21,743 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-21 21:15:21,746 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-21 21:15:21,907 INFO L354 Elim1Store]: treesize reduction 9, result has 10.0 percent of original size [2021-05-21 21:15:21,907 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 [2021-05-21 21:15:21,909 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-21 21:15:21,917 INFO L628 ElimStorePlain]: treesize reduction 7, result has 65.0 percent of original size [2021-05-21 21:15:21,917 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-21 21:15:21,917 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:44, output treesize:13 [2021-05-21 21:15:21,960 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 [2021-05-21 21:15:21,961 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-21 21:15:21,962 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-21 21:15:21,963 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-21 21:15:21,963 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:15, output treesize:5 [2021-05-21 21:15:21,977 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-21 21:15:21,977 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1372664360] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 21:15:21,977 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-21 21:15:21,977 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 14 [2021-05-21 21:15:21,977 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [511655445] [2021-05-21 21:15:21,978 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-21 21:15:21,978 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-21 21:15:21,978 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-21 21:15:21,978 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=177, Unknown=0, NotChecked=0, Total=210 [2021-05-21 21:15:21,978 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) [2021-05-21 21:15:22,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-21 21:15:22,783 INFO L93 Difference]: Finished difference Result 25400 states and 103218 transitions. [2021-05-21 21:15:22,784 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-21 21:15:22,784 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 [2021-05-21 21:15:22,784 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-21 21:15:22,869 INFO L225 Difference]: With dead ends: 25400 [2021-05-21 21:15:22,869 INFO L226 Difference]: Without dead ends: 25281 [2021-05-21 21:15:22,870 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 27 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 341.8ms TimeCoverageRelationStatistics Valid=77, Invalid=429, Unknown=0, NotChecked=0, Total=506 [2021-05-21 21:15:22,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25281 states. [2021-05-21 21:15:23,377 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25281 to 9001. [2021-05-21 21:15:23,394 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) [2021-05-21 21:15:23,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9001 states to 9001 states and 37162 transitions. [2021-05-21 21:15:23,426 INFO L78 Accepts]: Start accepts. Automaton has 9001 states and 37162 transitions. Word has length 34 [2021-05-21 21:15:23,426 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-21 21:15:23,426 INFO L482 AbstractCegarLoop]: Abstraction has 9001 states and 37162 transitions. [2021-05-21 21:15:23,427 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) [2021-05-21 21:15:23,427 INFO L276 IsEmpty]: Start isEmpty. Operand 9001 states and 37162 transitions. [2021-05-21 21:15:23,449 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-21 21:15:23,449 INFO L513 BasicCegarLoop]: Found error trace [2021-05-21 21:15:23,450 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] [2021-05-21 21:15:23,672 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-21 21:15:23,673 INFO L430 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr3INUSE_VIOLATION, ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-21 21:15:23,673 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-21 21:15:23,674 INFO L82 PathProgramCache]: Analyzing trace with hash -2139027627, now seen corresponding path program 5 times [2021-05-21 21:15:23,674 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-21 21:15:23,674 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [398718487] [2021-05-21 21:15:23,674 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-21 21:15:23,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-21 21:15:23,848 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-21 21:15:23,848 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-21 21:15:23,848 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [398718487] [2021-05-21 21:15:23,848 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [398718487] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-21 21:15:23,848 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [819980428] [2021-05-21 21:15:23,848 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 [2021-05-21 21:15:23,887 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-21 21:15:23,887 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-21 21:15:23,888 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 24 conjunts are in the unsatisfiable core [2021-05-21 21:15:23,889 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-21 21:15:24,045 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 [2021-05-21 21:15:24,047 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-21 21:15:24,053 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-21 21:15:24,053 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-21 21:15:24,054 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:41, output treesize:32 [2021-05-21 21:15:24,088 WARN L348 FreeRefinementEngine]: Global settings require throwing the following exception [2021-05-21 21:15:24,312 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-05-21 21:15:24,313 FATAL L? ?]: The Plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction has thrown an exception: java.lang.NullPointerException at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.EqualityInformation.getEqinfo(EqualityInformation.java:130) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.XnfDer.derSimple(XnfDer.java:308) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.XnfDer.tryToEliminate_EqInfoBased(XnfDer.java:138) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.XnfDer.tryToEliminate(XnfDer.java:101) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.PartialQuantifierElimination.elim(PartialQuantifierElimination.java:255) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.PartialQuantifierElimination.tryToEliminate(PartialQuantifierElimination.java:100) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.predicates.IterativePredicateTransformer$QuantifierEliminationPostprocessor.postprocess(IterativePredicateTransformer.java:246) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.predicates.IterativePredicateTransformer.applyPostprocessors(IterativePredicateTransformer.java:440) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.predicates.IterativePredicateTransformer.computeStrongestPostconditionSequence(IterativePredicateTransformer.java:201) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.singletracecheck.TraceCheckSpWp.computeInterpolantsUsingUnsatCore(TraceCheckSpWp.java:299) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.singletracecheck.TraceCheckSpWp.computeInterpolants(TraceCheckSpWp.java:185) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.singletracecheck.TraceCheckSpWp.(TraceCheckSpWp.java:163) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSpWp.construct(IpTcStrategyModuleSpWp.java:108) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSpWp.construct(IpTcStrategyModuleSpWp.java:1) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:297) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:190) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:180) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:439) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:374) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:69) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:63) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:371) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:307) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseConcurrentProgram(TraceAbstractionStarter.java:236) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:167) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-05-21 21:15:24,315 INFO L168 Benchmark]: Toolchain (without parser) took 12573.71 ms. Allocated memory was 339.7 MB in the beginning and 1.1 GB in the end (delta: 750.8 MB). Free memory was 319.4 MB in the beginning and 795.1 MB in the end (delta: -475.8 MB). Peak memory consumption was 276.2 MB. Max. memory is 16.0 GB. [2021-05-21 21:15:24,315 INFO L168 Benchmark]: Boogie PL CUP Parser took 0.14 ms. Allocated memory is still 339.7 MB. Free memory is still 320.5 MB. There was no memory consumed. Max. memory is 16.0 GB. [2021-05-21 21:15:24,315 INFO L168 Benchmark]: Boogie Procedure Inliner took 26.57 ms. Allocated memory is still 339.7 MB. Free memory was 319.4 MB in the beginning and 317.8 MB in the end (delta: 1.5 MB). There was no memory consumed. Max. memory is 16.0 GB. [2021-05-21 21:15:24,315 INFO L168 Benchmark]: Boogie Preprocessor took 16.68 ms. Allocated memory is still 339.7 MB. Free memory was 317.8 MB in the beginning and 316.8 MB in the end (delta: 989.8 kB). Peak memory consumption was 2.1 MB. Max. memory is 16.0 GB. [2021-05-21 21:15:24,315 INFO L168 Benchmark]: RCFGBuilder took 430.45 ms. Allocated memory is still 339.7 MB. Free memory was 316.7 MB in the beginning and 301.7 MB in the end (delta: 15.1 MB). Peak memory consumption was 14.7 MB. Max. memory is 16.0 GB. [2021-05-21 21:15:24,315 INFO L168 Benchmark]: TraceAbstraction took 12095.54 ms. Allocated memory was 339.7 MB in the beginning and 1.1 GB in the end (delta: 750.8 MB). Free memory was 301.2 MB in the beginning and 795.1 MB in the end (delta: -494.0 MB). Peak memory consumption was 259.4 MB. Max. memory is 16.0 GB. [2021-05-21 21:15:24,316 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * Boogie PL CUP Parser took 0.14 ms. Allocated memory is still 339.7 MB. Free memory is still 320.5 MB. There was no memory consumed. Max. memory is 16.0 GB. * Boogie Procedure Inliner took 26.57 ms. Allocated memory is still 339.7 MB. Free memory was 319.4 MB in the beginning and 317.8 MB in the end (delta: 1.5 MB). There was no memory consumed. Max. memory is 16.0 GB. * Boogie Preprocessor took 16.68 ms. Allocated memory is still 339.7 MB. Free memory was 317.8 MB in the beginning and 316.8 MB in the end (delta: 989.8 kB). Peak memory consumption was 2.1 MB. Max. memory is 16.0 GB. * RCFGBuilder took 430.45 ms. Allocated memory is still 339.7 MB. Free memory was 316.7 MB in the beginning and 301.7 MB in the end (delta: 15.1 MB). Peak memory consumption was 14.7 MB. Max. memory is 16.0 GB. * TraceAbstraction took 12095.54 ms. Allocated memory was 339.7 MB in the beginning and 1.1 GB in the end (delta: 750.8 MB). Free memory was 301.2 MB in the beginning and 795.1 MB in the end (delta: -494.0 MB). Peak memory consumption was 259.4 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...