/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/unroll-cond-5.wvr.bpl -------------------------------------------------------------------------------- This is Ultimate 0.2.1-a865e3bea3ade1065a4c95009cfa501fe03c5538-a865e3b [2021-02-19 17:32:08,135 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-02-19 17:32:08,138 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-02-19 17:32:08,177 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-02-19 17:32:08,232 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 [2021-02-19 17:32:08,266 INFO L113 SettingsManager]: Loading preferences was successful [2021-02-19 17:32:08,266 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-02-19 17:32:08,267 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-02-19 17:32:08,267 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-02-19 17:32:08,270 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-02-19 17:32:08,270 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-02-19 17:32:08,270 INFO L138 SettingsManager]: * Use SBE=true [2021-02-19 17:32:08,271 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-02-19 17:32:08,271 INFO L138 SettingsManager]: * sizeof long=4 [2021-02-19 17:32:08,271 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-02-19 17:32:08,272 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-02-19 17:32:08,272 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-02-19 17:32:08,272 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-02-19 17:32:08,272 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-02-19 17:32:08,272 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-02-19 17:32:08,272 INFO L138 SettingsManager]: * sizeof long double=12 [2021-02-19 17:32:08,272 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-02-19 17:32:08,272 INFO L138 SettingsManager]: * Use constant arrays=true [2021-02-19 17:32:08,273 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-02-19 17:32:08,273 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-02-19 17:32:08,273 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-02-19 17:32:08,273 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-02-19 17:32:08,273 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-02-19 17:32:08,273 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-02-19 17:32:08,273 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-02-19 17:32:08,274 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-02-19 17:32:08,274 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-02-19 17:32:08,274 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-02-19 17:32:08,274 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-02-19 17:32:08,274 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-02-19 17:32:08,274 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-02-19 17:32:08,274 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-02-19 17:32:08,560 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-02-19 17:32:08,591 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-02-19 17:32:08,592 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-02-19 17:32:08,593 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2021-02-19 17:32:08,594 INFO L275 PluginConnector]: Boogie PL CUP Parser initialized [2021-02-19 17:32:08,594 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/weaver-benchmarks/generated/unroll-cond-5.wvr.bpl [2021-02-19 17:32:08,595 INFO L110 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/weaver-benchmarks/generated/unroll-cond-5.wvr.bpl' [2021-02-19 17:32:08,626 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-02-19 17:32:08,631 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-02-19 17:32:08,632 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-02-19 17:32:08,633 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-02-19 17:32:08,633 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-02-19 17:32:08,643 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "unroll-cond-5.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 19.02 05:32:08" (1/1) ... [2021-02-19 17:32:08,651 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "unroll-cond-5.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 19.02 05:32:08" (1/1) ... [2021-02-19 17:32:08,658 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-02-19 17:32:08,659 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-02-19 17:32:08,659 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-02-19 17:32:08,660 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-02-19 17:32:08,665 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "unroll-cond-5.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 19.02 05:32:08" (1/1) ... [2021-02-19 17:32:08,665 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "unroll-cond-5.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 19.02 05:32:08" (1/1) ... [2021-02-19 17:32:08,674 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "unroll-cond-5.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 19.02 05:32:08" (1/1) ... [2021-02-19 17:32:08,675 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "unroll-cond-5.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 19.02 05:32:08" (1/1) ... [2021-02-19 17:32:08,681 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "unroll-cond-5.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 19.02 05:32:08" (1/1) ... [2021-02-19 17:32:08,683 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "unroll-cond-5.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 19.02 05:32:08" (1/1) ... [2021-02-19 17:32:08,683 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "unroll-cond-5.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 19.02 05:32:08" (1/1) ... [2021-02-19 17:32:08,684 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-02-19 17:32:08,685 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-02-19 17:32:08,685 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-02-19 17:32:08,685 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-02-19 17:32:08,686 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "unroll-cond-5.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 19.02 05:32:08" (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 [2021-02-19 17:32:08,739 INFO L124 BoogieDeclarations]: Specification and implementation of procedure thread1 given in one single declaration [2021-02-19 17:32:08,739 INFO L130 BoogieDeclarations]: Found specification of procedure thread1 [2021-02-19 17:32:08,739 INFO L138 BoogieDeclarations]: Found implementation of procedure thread1 [2021-02-19 17:32:08,739 INFO L124 BoogieDeclarations]: Specification and implementation of procedure thread2 given in one single declaration [2021-02-19 17:32:08,739 INFO L130 BoogieDeclarations]: Found specification of procedure thread2 [2021-02-19 17:32:08,739 INFO L138 BoogieDeclarations]: Found implementation of procedure thread2 [2021-02-19 17:32:08,740 INFO L124 BoogieDeclarations]: Specification and implementation of procedure ULTIMATE.start given in one single declaration [2021-02-19 17:32:08,740 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-02-19 17:32:08,740 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-02-19 17:32:08,741 WARN L209 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to SingleStatement [2021-02-19 17:32:09,173 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-02-19 17:32:09,173 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-02-19 17:32:09,174 WARN L327 CfgBuilder]: Unexpected successor node of atomic block begin: thread1EXIT is neither atomic block end nor error location. [2021-02-19 17:32:09,176 INFO L202 PluginConnector]: Adding new model unroll-cond-5.wvr.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.02 05:32:09 BoogieIcfgContainer [2021-02-19 17:32:09,176 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-02-19 17:32:09,177 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-02-19 17:32:09,178 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-02-19 17:32:09,180 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-02-19 17:32:09,180 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "unroll-cond-5.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 19.02 05:32:08" (1/2) ... [2021-02-19 17:32:09,181 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1a4786a8 and model type unroll-cond-5.wvr.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.02 05:32:09, skipping insertion in model container [2021-02-19 17:32:09,181 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "unroll-cond-5.wvr.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.02 05:32:09" (2/2) ... [2021-02-19 17:32:09,182 INFO L111 eAbstractionObserver]: Analyzing ICFG unroll-cond-5.wvr.bpl [2021-02-19 17:32:09,187 WARN L142 ceAbstractionStarter]: Switching off computation of Hoare annotation because input is a concurrent program [2021-02-19 17:32:09,188 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-02-19 17:32:09,192 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-02-19 17:32:09,194 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2021-02-19 17:32:09,234 INFO L149 ThreadInstanceAdder]: Constructed 2 joinOtherThreadTransitions. [2021-02-19 17:32:09,247 INFO L253 AbstractCegarLoop]: Starting to check reachability of 3 error locations. [2021-02-19 17:32:09,271 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-02-19 17:32:09,272 INFO L377 AbstractCegarLoop]: Hoare is true [2021-02-19 17:32:09,272 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-02-19 17:32:09,272 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-02-19 17:32:09,272 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-02-19 17:32:09,272 INFO L381 AbstractCegarLoop]: Difference is false [2021-02-19 17:32:09,272 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-02-19 17:32:09,272 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-02-19 17:32:09,280 INFO L100 iNet2FiniteAutomaton]: Start petriNet2FiniteAutomaton. Operand has 21 places, 16 transitions, 48 flow [2021-02-19 17:32:09,289 INFO L122 iNet2FiniteAutomaton]: Finished petriNet2FiniteAutomaton. Result has 18 states, 16 states have (on average 1.8125) internal successors, (29), 17 states have internal predecessors, (29), 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) [2021-02-19 17:32:09,290 INFO L276 IsEmpty]: Start isEmpty. Operand has 18 states, 16 states have (on average 1.8125) internal successors, (29), 17 states have internal predecessors, (29), 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) [2021-02-19 17:32:09,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-02-19 17:32:09,295 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 17:32:09,295 INFO L506 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 17:32:09,296 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 17:32:09,301 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 17:32:09,301 INFO L82 PathProgramCache]: Analyzing trace with hash 2134575560, now seen corresponding path program 1 times [2021-02-19 17:32:09,308 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 17:32:09,309 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1420917823] [2021-02-19 17:32:09,309 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 17:32:09,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 17:32:09,503 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 17:32:09,504 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1420917823] [2021-02-19 17:32:09,505 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-02-19 17:32:09,505 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-02-19 17:32:09,506 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2028157492] [2021-02-19 17:32:09,509 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-02-19 17:32:09,509 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 17:32:09,520 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-02-19 17:32:09,520 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-02-19 17:32:09,522 INFO L87 Difference]: Start difference. First operand has 18 states, 16 states have (on average 1.8125) internal successors, (29), 17 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 17:32:09,559 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 17:32:09,559 INFO L93 Difference]: Finished difference Result 26 states and 43 transitions. [2021-02-19 17:32:09,560 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-02-19 17:32:09,561 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2021-02-19 17:32:09,561 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 17:32:09,568 INFO L225 Difference]: With dead ends: 26 [2021-02-19 17:32:09,568 INFO L226 Difference]: Without dead ends: 18 [2021-02-19 17:32:09,569 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2021-02-19 17:32:09,580 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-02-19 17:32:09,589 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2021-02-19 17:32:09,590 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 17 states have (on average 1.8823529411764706) internal successors, (32), 17 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 17:32:09,590 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 32 transitions. [2021-02-19 17:32:09,591 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 32 transitions. Word has length 10 [2021-02-19 17:32:09,591 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 17:32:09,591 INFO L480 AbstractCegarLoop]: Abstraction has 18 states and 32 transitions. [2021-02-19 17:32:09,592 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 17:32:09,592 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 32 transitions. [2021-02-19 17:32:09,592 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-02-19 17:32:09,592 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 17:32:09,592 INFO L506 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 17:32:09,592 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-02-19 17:32:09,593 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 17:32:09,593 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 17:32:09,593 INFO L82 PathProgramCache]: Analyzing trace with hash -1416808376, now seen corresponding path program 2 times [2021-02-19 17:32:09,593 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 17:32:09,594 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1460061780] [2021-02-19 17:32:09,594 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 17:32:09,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 17:32:09,640 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 17:32:09,640 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1460061780] [2021-02-19 17:32:09,640 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-02-19 17:32:09,640 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-02-19 17:32:09,640 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1973220935] [2021-02-19 17:32:09,641 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-02-19 17:32:09,642 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 17:32:09,642 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-02-19 17:32:09,642 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-02-19 17:32:09,642 INFO L87 Difference]: Start difference. First operand 18 states and 32 transitions. Second operand has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 17:32:09,669 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 17:32:09,669 INFO L93 Difference]: Finished difference Result 28 states and 51 transitions. [2021-02-19 17:32:09,675 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-02-19 17:32:09,675 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2021-02-19 17:32:09,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 17:32:09,676 INFO L225 Difference]: With dead ends: 28 [2021-02-19 17:32:09,676 INFO L226 Difference]: Without dead ends: 23 [2021-02-19 17:32:09,677 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-02-19 17:32:09,677 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-02-19 17:32:09,679 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 20. [2021-02-19 17:32:09,680 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.8421052631578947) internal successors, (35), 19 states have internal predecessors, (35), 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) [2021-02-19 17:32:09,680 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 35 transitions. [2021-02-19 17:32:09,680 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 35 transitions. Word has length 10 [2021-02-19 17:32:09,681 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 17:32:09,681 INFO L480 AbstractCegarLoop]: Abstraction has 20 states and 35 transitions. [2021-02-19 17:32:09,681 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 17:32:09,681 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 35 transitions. [2021-02-19 17:32:09,681 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-02-19 17:32:09,681 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 17:32:09,681 INFO L506 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 17:32:09,682 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-02-19 17:32:09,682 INFO L428 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 17:32:09,682 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 17:32:09,682 INFO L82 PathProgramCache]: Analyzing trace with hash 1692819464, now seen corresponding path program 1 times [2021-02-19 17:32:09,683 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 17:32:09,683 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [865997975] [2021-02-19 17:32:09,683 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 17:32:09,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 17:32:11,168 WARN L202 SmtUtils]: Spent 1.30 s on a formula simplification. DAG size of input: 5498 DAG size of output: 55 [2021-02-19 17:32:11,280 WARN L202 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 55 DAG size of output: 35 [2021-02-19 17:32:11,873 WARN L202 SmtUtils]: Spent 521.00 ms on a formula simplification. DAG size of input: 5496 DAG size of output: 12 [2021-02-19 17:32:11,893 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 17:32:11,893 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [865997975] [2021-02-19 17:32:11,893 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2122057755] [2021-02-19 17:32:11,893 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 [2021-02-19 17:32:11,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 17:32:11,925 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 16 conjunts are in the unsatisfiable core [2021-02-19 17:32:11,929 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 17:32:13,011 WARN L202 SmtUtils]: Spent 922.00 ms on a formula simplification. DAG size of input: 2125 DAG size of output: 13 [2021-02-19 17:32:13,052 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 [2021-02-19 17:32:13,059 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-02-19 17:32:13,061 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-02-19 17:32:13,061 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-02-19 17:32:13,062 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:11, output treesize:3 [2021-02-19 17:32:13,069 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 17:32:13,070 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 17:32:13,070 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2021-02-19 17:32:13,070 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [989389393] [2021-02-19 17:32:13,070 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-02-19 17:32:13,070 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 17:32:13,086 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-02-19 17:32:13,087 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2021-02-19 17:32:13,087 INFO L87 Difference]: Start difference. First operand 20 states and 35 transitions. Second operand has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 17:32:13,148 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 17:32:13,149 INFO L93 Difference]: Finished difference Result 30 states and 51 transitions. [2021-02-19 17:32:13,149 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-02-19 17:32:13,149 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-02-19 17:32:13,150 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 17:32:13,150 INFO L225 Difference]: With dead ends: 30 [2021-02-19 17:32:13,150 INFO L226 Difference]: Without dead ends: 22 [2021-02-19 17:32:13,151 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2021-02-19 17:32:13,151 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-02-19 17:32:13,153 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2021-02-19 17:32:13,154 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 21 states have (on average 1.9047619047619047) internal successors, (40), 21 states have internal predecessors, (40), 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) [2021-02-19 17:32:13,154 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 40 transitions. [2021-02-19 17:32:13,154 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 40 transitions. Word has length 11 [2021-02-19 17:32:13,154 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 17:32:13,154 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 40 transitions. [2021-02-19 17:32:13,155 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 17:32:13,155 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 40 transitions. [2021-02-19 17:32:13,155 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-02-19 17:32:13,155 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 17:32:13,155 INFO L506 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 17:32:13,370 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-02-19 17:32:13,370 INFO L428 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 17:32:13,370 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 17:32:13,370 INFO L82 PathProgramCache]: Analyzing trace with hash -1858564472, now seen corresponding path program 2 times [2021-02-19 17:32:13,371 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 17:32:13,371 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2091883012] [2021-02-19 17:32:13,371 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 17:32:13,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 17:32:14,043 WARN L202 SmtUtils]: Spent 574.00 ms on a formula simplification. DAG size of input: 5498 DAG size of output: 55 [2021-02-19 17:32:14,151 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 17:32:14,152 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2091883012] [2021-02-19 17:32:14,152 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1077804134] [2021-02-19 17:32:14,152 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 17:32:14,179 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-02-19 17:32:14,179 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 17:32:14,180 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 16 conjunts are in the unsatisfiable core [2021-02-19 17:32:14,181 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 17:32:14,867 WARN L202 SmtUtils]: Spent 629.00 ms on a formula simplification. DAG size of input: 2127 DAG size of output: 55 [2021-02-19 17:32:14,916 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 [2021-02-19 17:32:14,917 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-02-19 17:32:14,935 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-02-19 17:32:14,935 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 5 new quantified variables, introduced 3 case distinctions, treesize of input 15 treesize of output 37 [2021-02-19 17:32:14,946 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 2 xjuncts. [2021-02-19 17:32:14,955 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-02-19 17:32:14,955 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 3 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 18 [2021-02-19 17:32:14,957 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 2 xjuncts. [2021-02-19 17:32:14,984 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-02-19 17:32:14,985 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 7 new quantified variables, introduced 6 case distinctions, treesize of input 17 treesize of output 64 [2021-02-19 17:32:15,015 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 2 xjuncts. [2021-02-19 17:32:15,081 INFO L628 ElimStorePlain]: treesize reduction 61, result has 26.5 percent of original size [2021-02-19 17:32:15,082 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-02-19 17:32:15,082 INFO L247 ElimStorePlain]: Needed 5 recursive calls to eliminate 1 variables, input treesize:108, output treesize:22 [2021-02-19 17:32:15,125 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 17:32:15,125 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 17:32:15,125 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2021-02-19 17:32:15,126 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [193224305] [2021-02-19 17:32:15,126 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-02-19 17:32:15,126 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 17:32:15,126 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-02-19 17:32:15,127 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-02-19 17:32:15,127 INFO L87 Difference]: Start difference. First operand 22 states and 40 transitions. Second operand has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 17:32:15,202 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 17:32:15,202 INFO L93 Difference]: Finished difference Result 35 states and 68 transitions. [2021-02-19 17:32:15,202 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-02-19 17:32:15,202 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-02-19 17:32:15,203 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 17:32:15,203 INFO L225 Difference]: With dead ends: 35 [2021-02-19 17:32:15,203 INFO L226 Difference]: Without dead ends: 30 [2021-02-19 17:32:15,204 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-02-19 17:32:15,204 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-02-19 17:32:15,206 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 22. [2021-02-19 17:32:15,206 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 21 states have (on average 1.9047619047619047) internal successors, (40), 21 states have internal predecessors, (40), 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) [2021-02-19 17:32:15,207 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 40 transitions. [2021-02-19 17:32:15,207 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 40 transitions. Word has length 11 [2021-02-19 17:32:15,207 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 17:32:15,207 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 40 transitions. [2021-02-19 17:32:15,207 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 17:32:15,207 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 40 transitions. [2021-02-19 17:32:15,208 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-02-19 17:32:15,208 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 17:32:15,208 INFO L506 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 17:32:15,422 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 17:32:15,422 INFO L428 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 17:32:15,422 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 17:32:15,422 INFO L82 PathProgramCache]: Analyzing trace with hash -1007420340, now seen corresponding path program 3 times [2021-02-19 17:32:15,423 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 17:32:15,423 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1597589290] [2021-02-19 17:32:15,423 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 17:32:15,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 17:32:15,473 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 17:32:15,473 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1597589290] [2021-02-19 17:32:15,473 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1885245757] [2021-02-19 17:32:15,473 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 17:32:15,497 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-02-19 17:32:15,497 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 17:32:15,498 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 16 conjunts are in the unsatisfiable core [2021-02-19 17:32:15,499 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 17:34:40,543 WARN L202 SmtUtils]: Spent 2.40 m on a formula simplification. DAG size of input: 112621 DAG size of output: 53 [2021-02-19 17:34:40,640 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-02-19 17:34:40,641 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 5 new quantified variables, introduced 3 case distinctions, treesize of input 15 treesize of output 37 [2021-02-19 17:34:40,648 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 2 xjuncts. [2021-02-19 17:34:40,656 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-02-19 17:34:40,656 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 3 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 18 [2021-02-19 17:34:40,658 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 2 xjuncts. [2021-02-19 17:34:40,661 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 [2021-02-19 17:34:40,662 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-02-19 17:34:40,689 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-02-19 17:34:40,690 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 7 new quantified variables, introduced 6 case distinctions, treesize of input 17 treesize of output 64 [2021-02-19 17:34:40,744 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 2 xjuncts. [2021-02-19 17:34:40,805 INFO L628 ElimStorePlain]: treesize reduction 58, result has 27.5 percent of original size [2021-02-19 17:34:40,806 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-02-19 17:34:40,806 INFO L247 ElimStorePlain]: Needed 5 recursive calls to eliminate 1 variables, input treesize:105, output treesize:22 [2021-02-19 17:34:40,840 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 17:34:40,841 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 17:34:40,841 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2021-02-19 17:34:40,841 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1766376232] [2021-02-19 17:34:40,842 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-02-19 17:34:40,842 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 17:34:40,845 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-02-19 17:34:40,845 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-02-19 17:34:40,846 INFO L87 Difference]: Start difference. First operand 22 states and 40 transitions. Second operand has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 17:34:40,981 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 17:34:40,981 INFO L93 Difference]: Finished difference Result 51 states and 88 transitions. [2021-02-19 17:34:40,981 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-02-19 17:34:40,982 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-02-19 17:34:40,982 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 17:34:40,983 INFO L225 Difference]: With dead ends: 51 [2021-02-19 17:34:40,983 INFO L226 Difference]: Without dead ends: 41 [2021-02-19 17:34:40,984 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=50, Invalid=106, Unknown=0, NotChecked=0, Total=156 [2021-02-19 17:34:40,985 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-02-19 17:34:40,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 26. [2021-02-19 17:34:40,988 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 25 states have (on average 1.84) internal successors, (46), 25 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) [2021-02-19 17:34:40,989 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 46 transitions. [2021-02-19 17:34:40,989 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 46 transitions. Word has length 11 [2021-02-19 17:34:40,989 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 17:34:40,989 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 46 transitions. [2021-02-19 17:34:40,989 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 17:34:40,989 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 46 transitions. [2021-02-19 17:34:40,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-02-19 17:34:40,990 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 17:34:40,990 INFO L506 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 17:34:41,206 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 17:34:41,206 INFO L428 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 17:34:41,207 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 17:34:41,207 INFO L82 PathProgramCache]: Analyzing trace with hash -1668684123, now seen corresponding path program 1 times [2021-02-19 17:34:41,207 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 17:34:41,207 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1787879041] [2021-02-19 17:34:41,207 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 17:34:41,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 17:34:41,241 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 17:34:41,241 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1787879041] [2021-02-19 17:34:41,242 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-02-19 17:34:41,242 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-02-19 17:34:41,242 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [40114314] [2021-02-19 17:34:41,242 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-02-19 17:34:41,242 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 17:34:41,242 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-02-19 17:34:41,243 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-02-19 17:34:41,243 INFO L87 Difference]: Start difference. First operand 26 states and 46 transitions. Second operand has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 17:34:41,260 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 17:34:41,260 INFO L93 Difference]: Finished difference Result 29 states and 52 transitions. [2021-02-19 17:34:41,261 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-02-19 17:34:41,261 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-02-19 17:34:41,261 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 17:34:41,261 INFO L225 Difference]: With dead ends: 29 [2021-02-19 17:34:41,261 INFO L226 Difference]: Without dead ends: 29 [2021-02-19 17:34:41,262 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-02-19 17:34:41,262 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-02-19 17:34:41,265 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 27. [2021-02-19 17:34:41,265 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.8846153846153846) internal successors, (49), 26 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 17:34:41,267 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 49 transitions. [2021-02-19 17:34:41,267 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 49 transitions. Word has length 11 [2021-02-19 17:34:41,267 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 17:34:41,268 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 49 transitions. [2021-02-19 17:34:41,268 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 17:34:41,268 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 49 transitions. [2021-02-19 17:34:41,268 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-02-19 17:34:41,269 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 17:34:41,269 INFO L506 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 17:34:41,269 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2021-02-19 17:34:41,269 INFO L428 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 17:34:41,269 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 17:34:41,269 INFO L82 PathProgramCache]: Analyzing trace with hash 883282376, now seen corresponding path program 4 times [2021-02-19 17:34:41,269 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 17:34:41,269 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [752429175] [2021-02-19 17:34:41,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 17:34:41,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 17:34:41,662 WARN L202 SmtUtils]: Spent 331.00 ms on a formula simplification. DAG size of input: 2869 DAG size of output: 55 [2021-02-19 17:34:41,786 WARN L202 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 55 DAG size of output: 38 [2021-02-19 17:34:42,355 WARN L202 SmtUtils]: Spent 529.00 ms on a formula simplification. DAG size of input: 5567 DAG size of output: 61 [2021-02-19 17:34:42,484 WARN L202 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 29 [2021-02-19 17:34:43,054 WARN L202 SmtUtils]: Spent 533.00 ms on a formula simplification. DAG size of input: 5565 DAG size of output: 17 [2021-02-19 17:34:43,075 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 17:34:43,075 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [752429175] [2021-02-19 17:34:43,075 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1822154674] [2021-02-19 17:34:43,075 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 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 [2021-02-19 17:34:43,095 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-02-19 17:34:43,095 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 17:34:43,096 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 20 conjunts are in the unsatisfiable core [2021-02-19 17:34:43,096 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 17:34:43,797 WARN L202 SmtUtils]: Spent 578.00 ms on a formula simplification. DAG size of input: 2125 DAG size of output: 15 [2021-02-19 17:34:43,805 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-02-19 17:34:43,806 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 3 new quantified variables, introduced 1 case distinctions, treesize of input 15 treesize of output 18 [2021-02-19 17:34:43,808 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-02-19 17:34:43,809 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-02-19 17:34:43,810 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-02-19 17:34:43,810 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:15, output treesize:3 [2021-02-19 17:34:43,817 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 17:34:43,817 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 17:34:43,817 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 10 [2021-02-19 17:34:43,817 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1193910730] [2021-02-19 17:34:43,817 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-02-19 17:34:43,818 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 17:34:43,818 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-02-19 17:34:43,818 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-02-19 17:34:43,818 INFO L87 Difference]: Start difference. First operand 27 states and 49 transitions. Second operand has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 10 states have internal predecessors, (20), 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) [2021-02-19 17:34:43,895 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 17:34:43,895 INFO L93 Difference]: Finished difference Result 37 states and 65 transitions. [2021-02-19 17:34:43,895 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-02-19 17:34:43,895 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 10 states have internal predecessors, (20), 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 12 [2021-02-19 17:34:43,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 17:34:43,896 INFO L225 Difference]: With dead ends: 37 [2021-02-19 17:34:43,896 INFO L226 Difference]: Without dead ends: 29 [2021-02-19 17:34:43,896 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2021-02-19 17:34:43,896 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-02-19 17:34:43,898 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2021-02-19 17:34:43,898 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 28 states have (on average 1.9285714285714286) internal successors, (54), 28 states have internal predecessors, (54), 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) [2021-02-19 17:34:43,899 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 54 transitions. [2021-02-19 17:34:43,899 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 54 transitions. Word has length 12 [2021-02-19 17:34:43,899 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 17:34:43,899 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 54 transitions. [2021-02-19 17:34:43,899 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 10 states have internal predecessors, (20), 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) [2021-02-19 17:34:43,899 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 54 transitions. [2021-02-19 17:34:43,900 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-02-19 17:34:43,900 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 17:34:43,900 INFO L506 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 17:34:44,102 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 17:34:44,102 INFO L428 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 17:34:44,102 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 17:34:44,103 INFO L82 PathProgramCache]: Analyzing trace with hash 1626865736, now seen corresponding path program 5 times [2021-02-19 17:34:44,103 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 17:34:44,103 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1086948256] [2021-02-19 17:34:44,103 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 17:34:44,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 17:34:44,877 WARN L202 SmtUtils]: Spent 709.00 ms on a formula simplification. DAG size of input: 2888 DAG size of output: 58 [2021-02-19 17:34:45,097 WARN L202 SmtUtils]: Spent 212.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 37 [2021-02-19 17:34:46,260 WARN L202 SmtUtils]: Spent 1.08 s on a formula simplification. DAG size of input: 7770 DAG size of output: 63 [2021-02-19 17:34:46,489 WARN L202 SmtUtils]: Spent 220.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 37 [2021-02-19 17:34:46,504 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 17:34:46,504 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1086948256] [2021-02-19 17:34:46,504 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1261299910] [2021-02-19 17:34:46,504 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 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 [2021-02-19 17:34:46,528 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-02-19 17:34:46,528 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 17:34:46,529 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 20 conjunts are in the unsatisfiable core [2021-02-19 17:34:46,531 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 17:34:47,216 WARN L202 SmtUtils]: Spent 618.00 ms on a formula simplification. DAG size of input: 2127 DAG size of output: 32 [2021-02-19 17:34:47,245 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-02-19 17:34:47,245 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 5 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 37 [2021-02-19 17:34:47,257 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 3 xjuncts. [2021-02-19 17:34:47,291 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-02-19 17:34:47,291 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 7 new quantified variables, introduced 6 case distinctions, treesize of input 19 treesize of output 64 [2021-02-19 17:34:47,330 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 2 xjuncts. [2021-02-19 17:34:47,336 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-02-19 17:34:47,337 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 3 new quantified variables, introduced 1 case distinctions, treesize of input 15 treesize of output 18 [2021-02-19 17:34:47,339 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-02-19 17:34:47,389 INFO L628 ElimStorePlain]: treesize reduction 33, result has 49.2 percent of original size [2021-02-19 17:34:47,390 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 3 xjuncts. [2021-02-19 17:34:47,390 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 1 variables, input treesize:85, output treesize:32 [2021-02-19 17:34:47,432 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 17:34:47,432 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 17:34:47,432 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 10 [2021-02-19 17:34:47,433 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1440717796] [2021-02-19 17:34:47,433 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-02-19 17:34:47,433 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 17:34:47,433 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-02-19 17:34:47,433 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2021-02-19 17:34:47,433 INFO L87 Difference]: Start difference. First operand 29 states and 54 transitions. Second operand has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 10 states have internal predecessors, (20), 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) [2021-02-19 17:34:47,514 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 17:34:47,514 INFO L93 Difference]: Finished difference Result 43 states and 85 transitions. [2021-02-19 17:34:47,514 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-02-19 17:34:47,514 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 10 states have internal predecessors, (20), 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 12 [2021-02-19 17:34:47,515 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 17:34:47,515 INFO L225 Difference]: With dead ends: 43 [2021-02-19 17:34:47,515 INFO L226 Difference]: Without dead ends: 38 [2021-02-19 17:34:47,515 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2021-02-19 17:34:47,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-02-19 17:34:47,517 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 29. [2021-02-19 17:34:47,518 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 28 states have (on average 1.9285714285714286) internal successors, (54), 28 states have internal predecessors, (54), 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) [2021-02-19 17:34:47,518 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 54 transitions. [2021-02-19 17:34:47,518 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 54 transitions. Word has length 12 [2021-02-19 17:34:47,518 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 17:34:47,518 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 54 transitions. [2021-02-19 17:34:47,518 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 10 states have internal predecessors, (20), 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) [2021-02-19 17:34:47,519 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 54 transitions. [2021-02-19 17:34:47,519 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-02-19 17:34:47,519 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 17:34:47,519 INFO L506 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 17:34:47,719 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2021-02-19 17:34:47,720 INFO L428 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 17:34:47,720 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 17:34:47,720 INFO L82 PathProgramCache]: Analyzing trace with hash -1816957428, now seen corresponding path program 6 times [2021-02-19 17:34:47,720 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 17:34:47,720 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1558023406] [2021-02-19 17:34:47,720 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 17:34:47,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 17:34:48,074 WARN L202 SmtUtils]: Spent 301.00 ms on a formula simplification. DAG size of input: 2846 DAG size of output: 51 [2021-02-19 17:34:48,183 WARN L202 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 31 [2021-02-19 17:34:48,202 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 17:34:48,202 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1558023406] [2021-02-19 17:34:48,202 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1636596875] [2021-02-19 17:34:48,202 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE 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 [2021-02-19 17:34:48,218 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-02-19 17:34:48,219 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 17:34:48,221 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 20 conjunts are in the unsatisfiable core [2021-02-19 17:34:48,222 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 17:34:48,347 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-02-19 17:34:48,347 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 5 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 37 [2021-02-19 17:34:48,355 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 3 xjuncts. [2021-02-19 17:34:48,379 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-02-19 17:34:48,380 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 7 new quantified variables, introduced 6 case distinctions, treesize of input 19 treesize of output 64 [2021-02-19 17:34:48,402 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 2 xjuncts. [2021-02-19 17:34:48,407 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-02-19 17:34:48,407 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 3 new quantified variables, introduced 1 case distinctions, treesize of input 15 treesize of output 18 [2021-02-19 17:34:48,409 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-02-19 17:34:48,454 INFO L628 ElimStorePlain]: treesize reduction 33, result has 49.2 percent of original size [2021-02-19 17:34:48,455 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 3 xjuncts. [2021-02-19 17:34:48,455 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 1 variables, input treesize:85, output treesize:32 [2021-02-19 17:34:48,485 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 17:34:48,485 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 17:34:48,485 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 10 [2021-02-19 17:34:48,485 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1275925621] [2021-02-19 17:34:48,486 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-02-19 17:34:48,486 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 17:34:48,486 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-02-19 17:34:48,486 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2021-02-19 17:34:48,486 INFO L87 Difference]: Start difference. First operand 29 states and 54 transitions. Second operand has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 10 states have internal predecessors, (20), 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) [2021-02-19 17:34:48,633 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 17:34:48,633 INFO L93 Difference]: Finished difference Result 61 states and 110 transitions. [2021-02-19 17:34:48,634 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-02-19 17:34:48,634 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 10 states have internal predecessors, (20), 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 12 [2021-02-19 17:34:48,634 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 17:34:48,634 INFO L225 Difference]: With dead ends: 61 [2021-02-19 17:34:48,634 INFO L226 Difference]: Without dead ends: 51 [2021-02-19 17:34:48,635 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=53, Invalid=157, Unknown=0, NotChecked=0, Total=210 [2021-02-19 17:34:48,635 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-02-19 17:34:48,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 29. [2021-02-19 17:34:48,637 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 28 states have (on average 1.9285714285714286) internal successors, (54), 28 states have internal predecessors, (54), 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) [2021-02-19 17:34:48,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 54 transitions. [2021-02-19 17:34:48,638 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 54 transitions. Word has length 12 [2021-02-19 17:34:48,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 17:34:48,638 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 54 transitions. [2021-02-19 17:34:48,638 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 10 states have internal predecessors, (20), 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) [2021-02-19 17:34:48,638 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 54 transitions. [2021-02-19 17:34:48,638 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-02-19 17:34:48,639 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 17:34:48,639 INFO L506 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 17:34:48,854 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 17:34:48,854 INFO L428 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 17:34:48,854 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 17:34:48,854 INFO L82 PathProgramCache]: Analyzing trace with hash 1816746085, now seen corresponding path program 1 times [2021-02-19 17:34:48,854 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 17:34:48,855 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1242935261] [2021-02-19 17:34:48,855 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 17:34:48,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 17:34:48,879 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 17:34:48,880 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1242935261] [2021-02-19 17:34:48,880 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [120859601] [2021-02-19 17:34:48,880 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 [2021-02-19 17:34:48,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 17:34:48,915 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 4 conjunts are in the unsatisfiable core [2021-02-19 17:34:48,916 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 17:34:48,939 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 17:34:48,939 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 17:34:48,939 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2021-02-19 17:34:48,940 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1958754857] [2021-02-19 17:34:48,940 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-02-19 17:34:48,940 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 17:34:48,940 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-02-19 17:34:48,940 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-02-19 17:34:48,941 INFO L87 Difference]: Start difference. First operand 29 states and 54 transitions. Second operand has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 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) [2021-02-19 17:34:48,980 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 17:34:48,981 INFO L93 Difference]: Finished difference Result 59 states and 102 transitions. [2021-02-19 17:34:48,981 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-02-19 17:34:48,981 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 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 12 [2021-02-19 17:34:48,981 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 17:34:48,982 INFO L225 Difference]: With dead ends: 59 [2021-02-19 17:34:48,984 INFO L226 Difference]: Without dead ends: 59 [2021-02-19 17:34:48,984 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 10 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-02-19 17:34:48,984 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-02-19 17:34:48,993 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 30. [2021-02-19 17:34:48,995 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 29 states have (on average 2.0) internal successors, (58), 29 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 17:34:48,996 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 58 transitions. [2021-02-19 17:34:48,996 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 58 transitions. Word has length 12 [2021-02-19 17:34:48,996 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 17:34:48,996 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 58 transitions. [2021-02-19 17:34:48,996 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 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) [2021-02-19 17:34:48,996 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 58 transitions. [2021-02-19 17:34:48,999 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-02-19 17:34:48,999 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 17:34:48,999 INFO L506 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 17:34:49,199 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable75,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 17:34:49,200 INFO L428 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 17:34:49,200 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 17:34:49,200 INFO L82 PathProgramCache]: Analyzing trace with hash -244113717, now seen corresponding path program 2 times [2021-02-19 17:34:49,200 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 17:34:49,201 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [540361391] [2021-02-19 17:34:49,201 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 17:34:49,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 17:34:49,219 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 17:34:49,220 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [540361391] [2021-02-19 17:34:49,220 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2106472554] [2021-02-19 17:34:49,220 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 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 [2021-02-19 17:34:49,238 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-02-19 17:34:49,238 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 17:34:49,239 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 4 conjunts are in the unsatisfiable core [2021-02-19 17:34:49,239 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 17:34:49,266 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 17:34:49,266 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 17:34:49,266 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2021-02-19 17:34:49,267 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [594393675] [2021-02-19 17:34:49,267 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-02-19 17:34:49,267 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 17:34:49,268 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-02-19 17:34:49,268 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-02-19 17:34:49,268 INFO L87 Difference]: Start difference. First operand 30 states and 58 transitions. Second operand has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 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) [2021-02-19 17:34:49,307 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 17:34:49,307 INFO L93 Difference]: Finished difference Result 43 states and 82 transitions. [2021-02-19 17:34:49,307 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-02-19 17:34:49,307 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 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 12 [2021-02-19 17:34:49,307 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 17:34:49,308 INFO L225 Difference]: With dead ends: 43 [2021-02-19 17:34:49,308 INFO L226 Difference]: Without dead ends: 43 [2021-02-19 17:34:49,308 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 10 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-02-19 17:34:49,308 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-02-19 17:34:49,310 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 32. [2021-02-19 17:34:49,310 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 31 states have (on average 2.064516129032258) internal successors, (64), 31 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 17:34:49,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 64 transitions. [2021-02-19 17:34:49,311 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 64 transitions. Word has length 12 [2021-02-19 17:34:49,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 17:34:49,311 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 64 transitions. [2021-02-19 17:34:49,311 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 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) [2021-02-19 17:34:49,311 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 64 transitions. [2021-02-19 17:34:49,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-02-19 17:34:49,311 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 17:34:49,311 INFO L506 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 17:34:49,526 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable76 [2021-02-19 17:34:49,526 INFO L428 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 17:34:49,526 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 17:34:49,526 INFO L82 PathProgramCache]: Analyzing trace with hash 1557436424, now seen corresponding path program 7 times [2021-02-19 17:34:49,526 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 17:34:49,527 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [72500006] [2021-02-19 17:34:49,527 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 17:34:49,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 17:34:49,921 WARN L202 SmtUtils]: Spent 297.00 ms on a formula simplification. DAG size of input: 2845 DAG size of output: 44 [2021-02-19 17:34:50,548 WARN L202 SmtUtils]: Spent 522.00 ms on a formula simplification. DAG size of input: 5510 DAG size of output: 25 [2021-02-19 17:34:51,115 WARN L202 SmtUtils]: Spent 498.00 ms on a formula simplification. DAG size of input: 5508 DAG size of output: 14 [2021-02-19 17:34:51,132 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 17:34:51,132 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [72500006] [2021-02-19 17:34:51,132 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1844889683] [2021-02-19 17:34:51,132 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY 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 [2021-02-19 17:34:51,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 17:34:51,158 WARN L261 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 24 conjunts are in the unsatisfiable core [2021-02-19 17:34:51,158 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 17:34:51,895 WARN L202 SmtUtils]: Spent 621.00 ms on a formula simplification. DAG size of input: 2125 DAG size of output: 16 [2021-02-19 17:34:51,908 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-02-19 17:34:51,908 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 5 new quantified variables, introduced 3 case distinctions, treesize of input 19 treesize of output 37 [2021-02-19 17:34:51,916 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-02-19 17:34:51,917 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-02-19 17:34:51,918 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-02-19 17:34:51,918 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:19, output treesize:3 [2021-02-19 17:34:51,928 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 17:34:51,928 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 17:34:51,928 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2021-02-19 17:34:51,928 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [417316934] [2021-02-19 17:34:51,929 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-02-19 17:34:51,929 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 17:34:51,929 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-02-19 17:34:51,929 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=126, Unknown=0, NotChecked=0, Total=156 [2021-02-19 17:34:51,930 INFO L87 Difference]: Start difference. First operand 32 states and 64 transitions. Second operand has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 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) [2021-02-19 17:34:52,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 17:34:52,016 INFO L93 Difference]: Finished difference Result 42 states and 80 transitions. [2021-02-19 17:34:52,016 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-02-19 17:34:52,016 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 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 13 [2021-02-19 17:34:52,016 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 17:34:52,017 INFO L225 Difference]: With dead ends: 42 [2021-02-19 17:34:52,017 INFO L226 Difference]: Without dead ends: 34 [2021-02-19 17:34:52,017 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2021-02-19 17:34:52,017 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-02-19 17:34:52,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2021-02-19 17:34:52,019 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 33 states have (on average 2.090909090909091) internal successors, (69), 33 states have internal predecessors, (69), 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) [2021-02-19 17:34:52,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 69 transitions. [2021-02-19 17:34:52,019 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 69 transitions. Word has length 13 [2021-02-19 17:34:52,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 17:34:52,019 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 69 transitions. [2021-02-19 17:34:52,019 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 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) [2021-02-19 17:34:52,020 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 69 transitions. [2021-02-19 17:34:52,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-02-19 17:34:52,020 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 17:34:52,020 INFO L506 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 17:34:52,220 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable77,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 17:34:52,221 INFO L428 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 17:34:52,221 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 17:34:52,221 INFO L82 PathProgramCache]: Analyzing trace with hash -1993947512, now seen corresponding path program 8 times [2021-02-19 17:34:52,221 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 17:34:52,221 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1270286839] [2021-02-19 17:34:52,221 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 17:34:52,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 17:34:52,635 WARN L202 SmtUtils]: Spent 291.00 ms on a formula simplification. DAG size of input: 2845 DAG size of output: 44 [2021-02-19 17:34:53,250 WARN L202 SmtUtils]: Spent 520.00 ms on a formula simplification. DAG size of input: 5510 DAG size of output: 25 [2021-02-19 17:34:53,296 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 17:34:53,296 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1270286839] [2021-02-19 17:34:53,297 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1395847357] [2021-02-19 17:34:53,297 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 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 [2021-02-19 17:34:53,314 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-02-19 17:34:53,314 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 17:34:53,315 WARN L261 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 24 conjunts are in the unsatisfiable core [2021-02-19 17:34:53,316 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 17:34:53,983 WARN L202 SmtUtils]: Spent 581.00 ms on a formula simplification. DAG size of input: 2127 DAG size of output: 25 [2021-02-19 17:34:54,004 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-02-19 17:34:54,004 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 5 new quantified variables, introduced 3 case distinctions, treesize of input 19 treesize of output 37 [2021-02-19 17:34:54,012 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-02-19 17:34:54,034 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-02-19 17:34:54,034 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 7 new quantified variables, introduced 6 case distinctions, treesize of input 21 treesize of output 64 [2021-02-19 17:34:54,057 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 3 xjuncts. [2021-02-19 17:34:54,076 INFO L628 ElimStorePlain]: treesize reduction 18, result has 50.0 percent of original size [2021-02-19 17:34:54,077 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-02-19 17:34:54,077 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:59, output treesize:18 [2021-02-19 17:34:54,105 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 17:34:54,105 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 17:34:54,106 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2021-02-19 17:34:54,106 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1331831047] [2021-02-19 17:34:54,106 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-02-19 17:34:54,106 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 17:34:54,106 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-02-19 17:34:54,106 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2021-02-19 17:34:54,107 INFO L87 Difference]: Start difference. First operand 34 states and 69 transitions. Second operand has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 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) [2021-02-19 17:34:54,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 17:34:54,218 INFO L93 Difference]: Finished difference Result 48 states and 97 transitions. [2021-02-19 17:34:54,219 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-02-19 17:34:54,219 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 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 13 [2021-02-19 17:34:54,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 17:34:54,219 INFO L225 Difference]: With dead ends: 48 [2021-02-19 17:34:54,219 INFO L226 Difference]: Without dead ends: 43 [2021-02-19 17:34:54,220 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2021-02-19 17:34:54,220 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-02-19 17:34:54,221 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 34. [2021-02-19 17:34:54,221 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 33 states have (on average 2.090909090909091) internal successors, (69), 33 states have internal predecessors, (69), 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) [2021-02-19 17:34:54,222 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 69 transitions. [2021-02-19 17:34:54,222 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 69 transitions. Word has length 13 [2021-02-19 17:34:54,222 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 17:34:54,222 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 69 transitions. [2021-02-19 17:34:54,222 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 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) [2021-02-19 17:34:54,222 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 69 transitions. [2021-02-19 17:34:54,222 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-02-19 17:34:54,223 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 17:34:54,223 INFO L506 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 17:34:54,430 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable81,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 17:34:54,430 INFO L428 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 17:34:54,430 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 17:34:54,430 INFO L82 PathProgramCache]: Analyzing trace with hash -1142803380, now seen corresponding path program 9 times [2021-02-19 17:34:54,431 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 17:34:54,431 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [831513901] [2021-02-19 17:34:54,431 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 17:34:54,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 17:34:55,137 WARN L202 SmtUtils]: Spent 621.00 ms on a formula simplification. DAG size of input: 2866 DAG size of output: 49 [2021-02-19 17:34:55,255 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 17:34:55,256 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [831513901] [2021-02-19 17:34:55,256 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [812053152] [2021-02-19 17:34:55,256 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 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-02-19 17:34:55,284 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-02-19 17:34:55,285 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 17:34:55,285 WARN L261 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 24 conjunts are in the unsatisfiable core [2021-02-19 17:34:55,287 INFO L286 TraceCheckSpWp]: Computing forward predicates... Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 17:34:56,065 WARN L202 SmtUtils]: Spent 708.00 ms on a formula simplification. DAG size of input: 2125 DAG size of output: 41 [2021-02-19 17:34:56,126 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-02-19 17:34:56,126 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 5 new quantified variables, introduced 3 case distinctions, treesize of input 19 treesize of output 37 [2021-02-19 17:34:56,134 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-02-19 17:34:56,157 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-02-19 17:34:56,157 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 7 new quantified variables, introduced 6 case distinctions, treesize of input 21 treesize of output 64 [2021-02-19 17:34:56,172 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 3 xjuncts. [2021-02-19 17:34:56,190 INFO L628 ElimStorePlain]: treesize reduction 18, result has 50.0 percent of original size [2021-02-19 17:34:56,191 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-02-19 17:34:56,191 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:59, output treesize:18 [2021-02-19 17:34:56,216 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 17:34:56,216 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 17:34:56,216 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2021-02-19 17:34:56,217 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [501685626] [2021-02-19 17:34:56,217 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-02-19 17:34:56,217 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 17:34:56,217 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-02-19 17:34:56,217 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2021-02-19 17:34:56,218 INFO L87 Difference]: Start difference. First operand 34 states and 69 transitions. Second operand has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 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) [2021-02-19 17:34:56,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 17:34:56,367 INFO L93 Difference]: Finished difference Result 73 states and 141 transitions. [2021-02-19 17:34:56,367 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-02-19 17:34:56,367 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 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 13 [2021-02-19 17:34:56,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 17:34:56,368 INFO L225 Difference]: With dead ends: 73 [2021-02-19 17:34:56,368 INFO L226 Difference]: Without dead ends: 63 [2021-02-19 17:34:56,368 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=58, Invalid=214, Unknown=0, NotChecked=0, Total=272 [2021-02-19 17:34:56,368 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-02-19 17:34:56,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 34. [2021-02-19 17:34:56,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 33 states have (on average 2.090909090909091) internal successors, (69), 33 states have internal predecessors, (69), 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) [2021-02-19 17:34:56,370 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 69 transitions. [2021-02-19 17:34:56,370 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 69 transitions. Word has length 13 [2021-02-19 17:34:56,370 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 17:34:56,370 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 69 transitions. [2021-02-19 17:34:56,370 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 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) [2021-02-19 17:34:56,370 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 69 transitions. [2021-02-19 17:34:56,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-02-19 17:34:56,371 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 17:34:56,371 INFO L506 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 17:34:56,578 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable97 [2021-02-19 17:34:56,578 INFO L428 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 17:34:56,578 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 17:34:56,578 INFO L82 PathProgramCache]: Analyzing trace with hash -1804067163, now seen corresponding path program 3 times [2021-02-19 17:34:56,578 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 17:34:56,578 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1223427672] [2021-02-19 17:34:56,578 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 17:34:56,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 17:34:56,610 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 17:34:56,611 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1223427672] [2021-02-19 17:34:56,611 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [637518956] [2021-02-19 17:34:56,611 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 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-02-19 17:34:56,644 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-02-19 17:34:56,644 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 17:34:56,645 INFO L263 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 5 conjunts are in the unsatisfiable core [2021-02-19 17:34:56,650 INFO L286 TraceCheckSpWp]: Computing forward predicates... Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 17:34:56,677 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 17:34:56,677 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 17:34:56,677 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2021-02-19 17:34:56,677 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [522421213] [2021-02-19 17:34:56,677 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-02-19 17:34:56,677 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 17:34:56,677 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-02-19 17:34:56,678 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-02-19 17:34:56,678 INFO L87 Difference]: Start difference. First operand 34 states and 69 transitions. Second operand has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 6 states have internal predecessors, (17), 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) [2021-02-19 17:34:56,722 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 17:34:56,722 INFO L93 Difference]: Finished difference Result 86 states and 153 transitions. [2021-02-19 17:34:56,723 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-02-19 17:34:56,723 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 6 states have internal predecessors, (17), 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 13 [2021-02-19 17:34:56,723 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 17:34:56,723 INFO L225 Difference]: With dead ends: 86 [2021-02-19 17:34:56,723 INFO L226 Difference]: Without dead ends: 86 [2021-02-19 17:34:56,725 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 11 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-02-19 17:34:56,725 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2021-02-19 17:34:56,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 35. [2021-02-19 17:34:56,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 2.1470588235294117) internal successors, (73), 34 states have internal predecessors, (73), 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) [2021-02-19 17:34:56,727 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 73 transitions. [2021-02-19 17:34:56,728 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 73 transitions. Word has length 13 [2021-02-19 17:34:56,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 17:34:56,728 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 73 transitions. [2021-02-19 17:34:56,728 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 6 states have internal predecessors, (17), 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) [2021-02-19 17:34:56,728 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 73 transitions. [2021-02-19 17:34:56,728 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-02-19 17:34:56,728 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 17:34:56,728 INFO L506 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 17:34:56,934 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable112 [2021-02-19 17:34:56,934 INFO L428 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 17:34:56,934 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 17:34:56,934 INFO L82 PathProgramCache]: Analyzing trace with hash 430040331, now seen corresponding path program 4 times [2021-02-19 17:34:56,934 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 17:34:56,934 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1908504933] [2021-02-19 17:34:56,934 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 17:34:56,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 17:34:56,977 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 17:34:56,978 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1908504933] [2021-02-19 17:34:56,978 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [987036910] [2021-02-19 17:34:56,978 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 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 17:34:57,015 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-02-19 17:34:57,015 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 17:34:57,016 INFO L263 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 5 conjunts are in the unsatisfiable core [2021-02-19 17:34:57,016 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 17:34:57,040 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 17:34:57,041 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 17:34:57,041 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2021-02-19 17:34:57,041 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1627443120] [2021-02-19 17:34:57,041 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-02-19 17:34:57,041 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 17:34:57,041 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-02-19 17:34:57,041 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-02-19 17:34:57,042 INFO L87 Difference]: Start difference. First operand 35 states and 73 transitions. Second operand has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 6 states have internal predecessors, (17), 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) [2021-02-19 17:34:57,082 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 17:34:57,082 INFO L93 Difference]: Finished difference Result 64 states and 118 transitions. [2021-02-19 17:34:57,083 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-02-19 17:34:57,083 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 6 states have internal predecessors, (17), 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 13 [2021-02-19 17:34:57,083 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 17:34:57,083 INFO L225 Difference]: With dead ends: 64 [2021-02-19 17:34:57,083 INFO L226 Difference]: Without dead ends: 64 [2021-02-19 17:34:57,083 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 11 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2021-02-19 17:34:57,083 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-02-19 17:34:57,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 35. [2021-02-19 17:34:57,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 2.1470588235294117) internal successors, (73), 34 states have internal predecessors, (73), 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) [2021-02-19 17:34:57,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 73 transitions. [2021-02-19 17:34:57,085 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 73 transitions. Word has length 13 [2021-02-19 17:34:57,085 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 17:34:57,085 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 73 transitions. [2021-02-19 17:34:57,085 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 6 states have internal predecessors, (17), 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) [2021-02-19 17:34:57,085 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 73 transitions. [2021-02-19 17:34:57,086 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-02-19 17:34:57,086 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 17:34:57,086 INFO L506 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 17:34:57,286 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable113 [2021-02-19 17:34:57,286 INFO L428 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 17:34:57,286 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 17:34:57,287 INFO L82 PathProgramCache]: Analyzing trace with hash 1378585548, now seen corresponding path program 10 times [2021-02-19 17:34:57,287 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 17:34:57,287 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [154195669] [2021-02-19 17:34:57,287 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 17:34:57,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 17:34:57,374 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 17:34:57,374 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [154195669] [2021-02-19 17:34:57,374 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1218479886] [2021-02-19 17:34:57,375 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 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 17:34:57,391 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-02-19 17:34:57,391 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 17:34:57,392 WARN L261 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 24 conjunts are in the unsatisfiable core [2021-02-19 17:34:57,392 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 17:37:22,305 WARN L202 SmtUtils]: Spent 2.40 m on a formula simplification. DAG size of input: 112621 DAG size of output: 53 [2021-02-19 17:37:22,466 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-02-19 17:37:22,466 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 5 new quantified variables, introduced 3 case distinctions, treesize of input 19 treesize of output 37 [2021-02-19 17:37:22,482 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-02-19 17:37:22,506 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-02-19 17:37:22,507 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 7 new quantified variables, introduced 6 case distinctions, treesize of input 21 treesize of output 64 [2021-02-19 17:37:22,539 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 3 xjuncts. [2021-02-19 17:37:22,559 INFO L628 ElimStorePlain]: treesize reduction 18, result has 50.0 percent of original size [2021-02-19 17:37:22,560 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-02-19 17:37:22,560 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:59, output treesize:18 [2021-02-19 17:37:22,595 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 17:37:22,596 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 17:37:22,596 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2021-02-19 17:37:22,596 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [92765118] [2021-02-19 17:37:22,596 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-02-19 17:37:22,596 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 17:37:22,597 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-02-19 17:37:22,597 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2021-02-19 17:37:22,597 INFO L87 Difference]: Start difference. First operand 35 states and 73 transitions. Second operand has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 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) [2021-02-19 17:37:22,961 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 17:37:22,961 INFO L93 Difference]: Finished difference Result 79 states and 154 transitions. [2021-02-19 17:37:22,962 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-02-19 17:37:22,962 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 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 13 [2021-02-19 17:37:22,962 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 17:37:22,962 INFO L225 Difference]: With dead ends: 79 [2021-02-19 17:37:22,962 INFO L226 Difference]: Without dead ends: 69 [2021-02-19 17:37:22,963 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=78, Invalid=302, Unknown=0, NotChecked=0, Total=380 [2021-02-19 17:37:22,963 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2021-02-19 17:37:22,964 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 38. [2021-02-19 17:37:22,965 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 37 states have (on average 2.135135135135135) internal successors, (79), 37 states have internal predecessors, (79), 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) [2021-02-19 17:37:22,965 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 79 transitions. [2021-02-19 17:37:22,965 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 79 transitions. Word has length 13 [2021-02-19 17:37:22,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 17:37:22,965 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 79 transitions. [2021-02-19 17:37:22,965 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 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) [2021-02-19 17:37:22,965 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 79 transitions. [2021-02-19 17:37:22,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-02-19 17:37:22,966 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 17:37:22,966 INFO L506 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 17:37:23,186 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable114 [2021-02-19 17:37:23,187 INFO L428 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 17:37:23,187 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 17:37:23,187 INFO L82 PathProgramCache]: Analyzing trace with hash 967895909, now seen corresponding path program 5 times [2021-02-19 17:37:23,187 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 17:37:23,187 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [973656912] [2021-02-19 17:37:23,187 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 17:37:23,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 17:37:23,211 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 17:37:23,211 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [973656912] [2021-02-19 17:37:23,211 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1119355001] [2021-02-19 17:37:23,211 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 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 17:37:23,258 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-02-19 17:37:23,258 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 17:37:23,259 INFO L263 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 5 conjunts are in the unsatisfiable core [2021-02-19 17:37:23,260 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 17:37:23,291 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 17:37:23,291 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 17:37:23,291 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2021-02-19 17:37:23,291 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [899037847] [2021-02-19 17:37:23,291 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-02-19 17:37:23,291 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 17:37:23,294 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-02-19 17:37:23,294 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-02-19 17:37:23,294 INFO L87 Difference]: Start difference. First operand 38 states and 79 transitions. Second operand has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 6 states have internal predecessors, (17), 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) [2021-02-19 17:37:23,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 17:37:23,336 INFO L93 Difference]: Finished difference Result 67 states and 133 transitions. [2021-02-19 17:37:23,336 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-02-19 17:37:23,336 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 6 states have internal predecessors, (17), 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 13 [2021-02-19 17:37:23,336 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 17:37:23,337 INFO L225 Difference]: With dead ends: 67 [2021-02-19 17:37:23,337 INFO L226 Difference]: Without dead ends: 67 [2021-02-19 17:37:23,337 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 11 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2021-02-19 17:37:23,337 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2021-02-19 17:37:23,339 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 40. [2021-02-19 17:37:23,339 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 39 states have (on average 2.1794871794871793) internal successors, (85), 39 states have internal predecessors, (85), 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) [2021-02-19 17:37:23,339 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 85 transitions. [2021-02-19 17:37:23,339 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 85 transitions. Word has length 13 [2021-02-19 17:37:23,339 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 17:37:23,339 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 85 transitions. [2021-02-19 17:37:23,339 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 6 states have internal predecessors, (17), 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) [2021-02-19 17:37:23,339 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 85 transitions. [2021-02-19 17:37:23,340 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-02-19 17:37:23,340 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 17:37:23,340 INFO L506 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 17:37:23,554 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable134 [2021-02-19 17:37:23,554 INFO L428 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 17:37:23,554 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 17:37:23,554 INFO L82 PathProgramCache]: Analyzing trace with hash 981375432, now seen corresponding path program 11 times [2021-02-19 17:37:23,554 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 17:37:23,554 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1627681036] [2021-02-19 17:37:23,554 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 17:37:23,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 17:37:23,946 WARN L202 SmtUtils]: Spent 297.00 ms on a formula simplification. DAG size of input: 2844 DAG size of output: 48 [2021-02-19 17:37:24,523 WARN L202 SmtUtils]: Spent 500.00 ms on a formula simplification. DAG size of input: 5510 DAG size of output: 14 [2021-02-19 17:37:24,542 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 17:37:24,542 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1627681036] [2021-02-19 17:37:24,542 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1985414793] [2021-02-19 17:37:24,542 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 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 17:37:24,558 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-02-19 17:37:24,559 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 17:37:24,559 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 22 conjunts are in the unsatisfiable core [2021-02-19 17:37:24,559 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 17:38:33,043 WARN L202 SmtUtils]: Spent 1.14 m on a formula simplification. DAG size of input: 7792 DAG size of output: 56 [2021-02-19 17:38:33,115 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-02-19 17:38:33,115 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 7 new quantified variables, introduced 6 case distinctions, treesize of input 23 treesize of output 64 [2021-02-19 17:38:33,143 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-02-19 17:38:33,144 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-02-19 17:38:33,145 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-02-19 17:38:33,145 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:23, output treesize:3 [2021-02-19 17:38:33,150 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 17:38:33,150 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 17:38:33,150 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2021-02-19 17:38:33,150 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1854941779] [2021-02-19 17:38:33,151 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-02-19 17:38:33,151 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 17:38:33,152 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-02-19 17:38:33,152 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=127, Unknown=0, NotChecked=0, Total=156 [2021-02-19 17:38:33,153 INFO L87 Difference]: Start difference. First operand 40 states and 85 transitions. Second operand has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 12 states have internal predecessors, (24), 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) [2021-02-19 17:38:33,259 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 17:38:33,260 INFO L93 Difference]: Finished difference Result 52 states and 108 transitions. [2021-02-19 17:38:33,260 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-02-19 17:38:33,260 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 12 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2021-02-19 17:38:33,260 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 17:38:33,261 INFO L225 Difference]: With dead ends: 52 [2021-02-19 17:38:33,261 INFO L226 Difference]: Without dead ends: 47 [2021-02-19 17:38:33,261 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=34, Invalid=148, Unknown=0, NotChecked=0, Total=182 [2021-02-19 17:38:33,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-02-19 17:38:33,263 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 45. [2021-02-19 17:38:33,263 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 44 states have (on average 2.1818181818181817) internal successors, (96), 44 states have internal predecessors, (96), 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) [2021-02-19 17:38:33,263 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 96 transitions. [2021-02-19 17:38:33,264 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 96 transitions. Word has length 14 [2021-02-19 17:38:33,264 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 17:38:33,264 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 96 transitions. [2021-02-19 17:38:33,265 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 12 states have internal predecessors, (24), 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) [2021-02-19 17:38:33,265 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 96 transitions. [2021-02-19 17:38:33,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-02-19 17:38:33,265 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 17:38:33,265 INFO L506 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 17:38:33,488 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable135 [2021-02-19 17:38:33,488 INFO L428 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 17:38:33,488 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 17:38:33,489 INFO L82 PathProgramCache]: Analyzing trace with hash -1718864372, now seen corresponding path program 12 times [2021-02-19 17:38:33,489 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 17:38:33,489 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [786040471] [2021-02-19 17:38:33,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 17:38:33,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 17:38:33,931 WARN L202 SmtUtils]: Spent 334.00 ms on a formula simplification. DAG size of input: 2844 DAG size of output: 48 [2021-02-19 17:38:33,990 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 17:38:33,990 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [786040471] [2021-02-19 17:38:33,990 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [331420197] [2021-02-19 17:38:33,990 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 17:38:34,007 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-02-19 17:38:34,007 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 17:38:34,007 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 22 conjunts are in the unsatisfiable core [2021-02-19 17:38:34,008 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 17:38:34,154 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-02-19 17:38:34,154 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 7 new quantified variables, introduced 6 case distinctions, treesize of input 23 treesize of output 64 [2021-02-19 17:38:34,177 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-02-19 17:38:34,178 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-02-19 17:38:34,179 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-02-19 17:38:34,179 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:23, output treesize:3 [2021-02-19 17:38:34,185 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 17:38:34,185 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 17:38:34,186 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2021-02-19 17:38:34,186 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1990417087] [2021-02-19 17:38:34,186 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-02-19 17:38:34,186 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 17:38:34,186 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-02-19 17:38:34,186 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=127, Unknown=0, NotChecked=0, Total=156 [2021-02-19 17:38:34,187 INFO L87 Difference]: Start difference. First operand 45 states and 96 transitions. Second operand has 13 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 12 states have internal predecessors, (23), 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) [2021-02-19 17:38:34,293 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 17:38:34,293 INFO L93 Difference]: Finished difference Result 63 states and 121 transitions. [2021-02-19 17:38:34,294 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-02-19 17:38:34,294 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2021-02-19 17:38:34,294 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 17:38:34,294 INFO L225 Difference]: With dead ends: 63 [2021-02-19 17:38:34,294 INFO L226 Difference]: Without dead ends: 58 [2021-02-19 17:38:34,295 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2021-02-19 17:38:34,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2021-02-19 17:38:34,296 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 45. [2021-02-19 17:38:34,296 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 44 states have (on average 2.1818181818181817) internal successors, (96), 44 states have internal predecessors, (96), 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) [2021-02-19 17:38:34,297 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 96 transitions. [2021-02-19 17:38:34,297 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 96 transitions. Word has length 14 [2021-02-19 17:38:34,297 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 17:38:34,297 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 96 transitions. [2021-02-19 17:38:34,297 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 12 states have internal predecessors, (23), 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) [2021-02-19 17:38:34,297 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 96 transitions. [2021-02-19 17:38:34,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-02-19 17:38:34,297 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 17:38:34,297 INFO L506 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 17:38:34,506 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable154,18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 17:38:34,506 INFO L428 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 17:38:34,506 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 17:38:34,506 INFO L82 PathProgramCache]: Analyzing trace with hash 1914839141, now seen corresponding path program 6 times [2021-02-19 17:38:34,506 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 17:38:34,506 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1354933450] [2021-02-19 17:38:34,506 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 17:38:34,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 17:38:34,537 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 17:38:34,537 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1354933450] [2021-02-19 17:38:34,537 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [931429255] [2021-02-19 17:38:34,537 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-02-19 17:38:34,569 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-02-19 17:38:34,569 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 17:38:34,569 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 6 conjunts are in the unsatisfiable core Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 17:38:34,571 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 17:38:34,601 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 17:38:34,601 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 17:38:34,601 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2021-02-19 17:38:34,601 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1275640441] [2021-02-19 17:38:34,603 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-02-19 17:38:34,603 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 17:38:34,604 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-02-19 17:38:34,604 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-02-19 17:38:34,604 INFO L87 Difference]: Start difference. First operand 45 states and 96 transitions. Second operand has 8 states, 8 states have (on average 2.25) internal successors, (18), 7 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 17:38:34,653 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 17:38:34,653 INFO L93 Difference]: Finished difference Result 111 states and 204 transitions. [2021-02-19 17:38:34,654 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-02-19 17:38:34,654 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.25) internal successors, (18), 7 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2021-02-19 17:38:34,654 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 17:38:34,655 INFO L225 Difference]: With dead ends: 111 [2021-02-19 17:38:34,655 INFO L226 Difference]: Without dead ends: 111 [2021-02-19 17:38:34,655 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 12 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-02-19 17:38:34,656 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2021-02-19 17:38:34,662 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 46. [2021-02-19 17:38:34,663 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 45 states have (on average 2.2222222222222223) internal successors, (100), 45 states have internal predecessors, (100), 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) [2021-02-19 17:38:34,663 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 100 transitions. [2021-02-19 17:38:34,663 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 100 transitions. Word has length 14 [2021-02-19 17:38:34,663 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 17:38:34,664 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 100 transitions. [2021-02-19 17:38:34,664 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 2.25) internal successors, (18), 7 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 17:38:34,664 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 100 transitions. [2021-02-19 17:38:34,665 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-02-19 17:38:34,666 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 17:38:34,666 INFO L506 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 17:38:34,873 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable170 [2021-02-19 17:38:34,873 INFO L428 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 17:38:34,873 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 17:38:34,873 INFO L82 PathProgramCache]: Analyzing trace with hash -146020661, now seen corresponding path program 7 times [2021-02-19 17:38:34,873 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 17:38:34,873 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1069824668] [2021-02-19 17:38:34,874 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 17:38:34,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 17:38:34,903 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 17:38:34,903 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1069824668] [2021-02-19 17:38:34,903 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1728696619] [2021-02-19 17:38:34,903 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 17:38:34,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 17:38:34,932 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 6 conjunts are in the unsatisfiable core [2021-02-19 17:38:34,932 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 17:38:34,967 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 17:38:34,968 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 17:38:34,968 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2021-02-19 17:38:34,968 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [188585923] [2021-02-19 17:38:34,968 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-02-19 17:38:34,968 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 17:38:34,969 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-02-19 17:38:34,969 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2021-02-19 17:38:34,969 INFO L87 Difference]: Start difference. First operand 46 states and 100 transitions. Second operand has 8 states, 8 states have (on average 2.25) internal successors, (18), 7 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 17:38:35,032 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 17:38:35,032 INFO L93 Difference]: Finished difference Result 104 states and 190 transitions. [2021-02-19 17:38:35,033 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-02-19 17:38:35,033 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.25) internal successors, (18), 7 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2021-02-19 17:38:35,033 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 17:38:35,033 INFO L225 Difference]: With dead ends: 104 [2021-02-19 17:38:35,033 INFO L226 Difference]: Without dead ends: 104 [2021-02-19 17:38:35,034 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 12 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2021-02-19 17:38:35,034 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2021-02-19 17:38:35,035 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 47. [2021-02-19 17:38:35,035 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 46 states have (on average 2.260869565217391) internal successors, (104), 46 states have internal predecessors, (104), 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) [2021-02-19 17:38:35,036 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 104 transitions. [2021-02-19 17:38:35,036 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 104 transitions. Word has length 14 [2021-02-19 17:38:35,036 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 17:38:35,036 INFO L480 AbstractCegarLoop]: Abstraction has 47 states and 104 transitions. [2021-02-19 17:38:35,036 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 2.25) internal successors, (18), 7 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 17:38:35,036 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 104 transitions. [2021-02-19 17:38:35,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-02-19 17:38:35,036 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 17:38:35,037 INFO L506 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 17:38:35,242 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable171,20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 17:38:35,242 INFO L428 AbstractCegarLoop]: === Iteration 23 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 17:38:35,242 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 17:38:35,242 INFO L82 PathProgramCache]: Analyzing trace with hash 802524556, now seen corresponding path program 13 times [2021-02-19 17:38:35,242 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 17:38:35,242 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [840243340] [2021-02-19 17:38:35,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 17:38:35,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 17:38:35,325 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 17:38:35,325 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [840243340] [2021-02-19 17:38:35,325 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1416888850] [2021-02-19 17:38:35,325 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 17:38:35,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 17:38:35,351 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 22 conjunts are in the unsatisfiable core [2021-02-19 17:38:35,353 INFO L286 TraceCheckSpWp]: Computing forward predicates... Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown