/usr/bin/java -Xmx16000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -s ../../../trunk/examples/settings/automizer/concurrent/svcomp-Reach-32bit-Automizer_Default-noMmResRef-FA-NoLbe-Separate.epf -tc ../../../trunk/examples/toolchains/AutomizerBplInline.xml -i ../../../trunk/examples/concurrent/bpl/pthread_nondet_loop_bound.bpl -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-770125f [2021-05-22 01:33:51,198 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-22 01:33:51,201 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-22 01:33:51,242 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-22 01:33:51,294 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-22 01:33:51,294 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-22 01:33:51,295 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-22 01:33:51,296 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/concurrent/svcomp-Reach-32bit-Automizer_Default-noMmResRef-FA-NoLbe-Separate.epf [2021-05-22 01:33:51,330 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-22 01:33:51,331 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-22 01:33:51,331 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-05-22 01:33:51,331 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-05-22 01:33:51,334 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-22 01:33:51,334 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-22 01:33:51,334 INFO L138 SettingsManager]: * Use SBE=true [2021-05-22 01:33:51,334 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-22 01:33:51,334 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-22 01:33:51,334 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-22 01:33:51,335 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-22 01:33:51,335 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-22 01:33:51,335 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-22 01:33:51,336 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-22 01:33:51,336 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-22 01:33:51,336 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-22 01:33:51,336 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-22 01:33:51,336 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-22 01:33:51,336 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-22 01:33:51,336 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-22 01:33:51,336 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-22 01:33:51,336 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-22 01:33:51,337 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-22 01:33:51,337 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-22 01:33:51,337 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-22 01:33:51,337 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-22 01:33:51,337 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-22 01:33:51,337 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-22 01:33:51,337 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-22 01:33:51,338 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-05-22 01:33:51,338 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-22 01:33:51,338 INFO L138 SettingsManager]: * Check the insufficient thread errors last=true [2021-05-22 01:33:51,338 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-05-22 01:33:51,638 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-22 01:33:51,653 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-22 01:33:51,656 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-22 01:33:51,656 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2021-05-22 01:33:51,657 INFO L275 PluginConnector]: Boogie PL CUP Parser initialized [2021-05-22 01:33:51,658 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/pthread_nondet_loop_bound.bpl [2021-05-22 01:33:51,658 INFO L110 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/pthread_nondet_loop_bound.bpl' [2021-05-22 01:33:51,683 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-22 01:33:51,684 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-22 01:33:51,685 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-05-22 01:33:51,685 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-05-22 01:33:51,685 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-05-22 01:33:51,695 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "pthread_nondet_loop_bound.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 22.05 01:33:51" (1/1) ... [2021-05-22 01:33:51,701 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "pthread_nondet_loop_bound.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 22.05 01:33:51" (1/1) ... [2021-05-22 01:33:51,707 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-05-22 01:33:51,708 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-22 01:33:51,708 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-22 01:33:51,708 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-22 01:33:51,714 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "pthread_nondet_loop_bound.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 22.05 01:33:51" (1/1) ... [2021-05-22 01:33:51,714 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "pthread_nondet_loop_bound.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 22.05 01:33:51" (1/1) ... [2021-05-22 01:33:51,714 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "pthread_nondet_loop_bound.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 22.05 01:33:51" (1/1) ... [2021-05-22 01:33:51,714 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "pthread_nondet_loop_bound.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 22.05 01:33:51" (1/1) ... [2021-05-22 01:33:51,716 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "pthread_nondet_loop_bound.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 22.05 01:33:51" (1/1) ... [2021-05-22 01:33:51,718 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "pthread_nondet_loop_bound.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 22.05 01:33:51" (1/1) ... [2021-05-22 01:33:51,719 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "pthread_nondet_loop_bound.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 22.05 01:33:51" (1/1) ... [2021-05-22 01:33:51,720 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-22 01:33:51,721 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-22 01:33:51,721 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-22 01:33:51,722 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-22 01:33:51,724 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "pthread_nondet_loop_bound.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 22.05 01:33:51" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-22 01:33:51,792 INFO L124 BoogieDeclarations]: Specification and implementation of procedure ULTIMATE.start given in one single declaration [2021-05-22 01:33:51,793 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-22 01:33:51,793 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-22 01:33:51,793 INFO L124 BoogieDeclarations]: Specification and implementation of procedure thread given in one single declaration [2021-05-22 01:33:51,793 INFO L130 BoogieDeclarations]: Found specification of procedure thread [2021-05-22 01:33:51,793 INFO L138 BoogieDeclarations]: Found implementation of procedure thread [2021-05-22 01:33:51,794 WARN L209 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to SingleStatement [2021-05-22 01:33:51,931 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-22 01:33:51,931 INFO L299 CfgBuilder]: Removed 0 assume(true) statements. [2021-05-22 01:33:51,933 INFO L202 PluginConnector]: Adding new model pthread_nondet_loop_bound.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.05 01:33:51 BoogieIcfgContainer [2021-05-22 01:33:51,933 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-22 01:33:51,935 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-22 01:33:51,935 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-22 01:33:51,938 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-22 01:33:51,938 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "pthread_nondet_loop_bound.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 22.05 01:33:51" (1/2) ... [2021-05-22 01:33:51,939 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@155e5c05 and model type pthread_nondet_loop_bound.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.05 01:33:51, skipping insertion in model container [2021-05-22 01:33:51,939 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "pthread_nondet_loop_bound.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.05 01:33:51" (2/2) ... [2021-05-22 01:33:51,940 INFO L111 eAbstractionObserver]: Analyzing ICFG pthread_nondet_loop_bound.bpl [2021-05-22 01:33:51,950 WARN L148 ceAbstractionStarter]: Switching off computation of Hoare annotation because input is a concurrent program [2021-05-22 01:33:51,950 INFO L214 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-22 01:33:51,950 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-05-22 01:33:51,951 INFO L478 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2021-05-22 01:33:51,982 WARN L313 ript$VariableManager]: TermVariabe threadThread1of1ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-05-22 01:33:51,983 WARN L313 ript$VariableManager]: TermVariabe threadThread1of1ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-05-22 01:33:51,984 WARN L313 ript$VariableManager]: TermVariabe threadThread1of1ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-05-22 01:33:51,984 WARN L313 ript$VariableManager]: TermVariabe threadThread1of1ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-05-22 01:33:51,990 WARN L313 ript$VariableManager]: TermVariabe threadThread1of1ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-05-22 01:33:51,995 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-05-22 01:33:52,018 INFO L255 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-05-22 01:33:52,034 INFO L378 AbstractCegarLoop]: Interprodecural is true [2021-05-22 01:33:52,034 INFO L379 AbstractCegarLoop]: Hoare is false [2021-05-22 01:33:52,034 INFO L380 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-22 01:33:52,034 INFO L381 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-22 01:33:52,034 INFO L382 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-22 01:33:52,034 INFO L383 AbstractCegarLoop]: Difference is false [2021-05-22 01:33:52,035 INFO L384 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-22 01:33:52,035 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-22 01:33:52,042 INFO L100 iNet2FiniteAutomaton]: Start petriNet2FiniteAutomaton. Operand has 16 places, 13 transitions, 31 flow [2021-05-22 01:33:52,052 INFO L122 iNet2FiniteAutomaton]: Finished petriNet2FiniteAutomaton. Result has 42 states, 37 states have (on average 1.7837837837837838) internal successors, (66), 41 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:33:52,054 INFO L276 IsEmpty]: Start isEmpty. Operand has 42 states, 37 states have (on average 1.7837837837837838) internal successors, (66), 41 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:33:52,058 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-05-22 01:33:52,059 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:33:52,059 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:33:52,060 INFO L430 AbstractCegarLoop]: === Iteration 1 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:33:52,064 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:33:52,064 INFO L82 PathProgramCache]: Analyzing trace with hash 268785362, now seen corresponding path program 1 times [2021-05-22 01:33:52,072 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:33:52,072 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1094351235] [2021-05-22 01:33:52,072 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:33:52,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:33:52,222 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:33:52,222 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:33:52,223 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1094351235] [2021-05-22 01:33:52,223 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1094351235] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-22 01:33:52,224 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-22 01:33:52,224 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-22 01:33:52,224 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1432366452] [2021-05-22 01:33:52,227 INFO L462 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-22 01:33:52,228 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:33:52,238 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-22 01:33:52,238 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-05-22 01:33:52,240 INFO L87 Difference]: Start difference. First operand has 42 states, 37 states have (on average 1.7837837837837838) internal successors, (66), 41 states have internal predecessors, (66), 0 states have call successors, (0), 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 7 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 6 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:33:52,440 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:33:52,441 INFO L93 Difference]: Finished difference Result 42 states and 62 transitions. [2021-05-22 01:33:52,441 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-22 01:33:52,442 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 6 states have internal predecessors, (7), 0 states have call successors, (0), 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 7 [2021-05-22 01:33:52,443 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:33:52,447 INFO L225 Difference]: With dead ends: 42 [2021-05-22 01:33:52,447 INFO L226 Difference]: Without dead ends: 0 [2021-05-22 01:33:52,448 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 115.4ms TimeCoverageRelationStatistics Valid=47, Invalid=85, Unknown=0, NotChecked=0, Total=132 [2021-05-22 01:33:52,460 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-05-22 01:33:52,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-05-22 01:33:52,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:33:52,464 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-05-22 01:33:52,465 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 7 [2021-05-22 01:33:52,465 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:33:52,465 INFO L482 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-05-22 01:33:52,466 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 7 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 6 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:33:52,466 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-05-22 01:33:52,466 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-05-22 01:33:52,466 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-22 01:33:52,467 INFO L315 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE (1/2) [2021-05-22 01:33:52,469 INFO L255 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-22 01:33:52,470 INFO L378 AbstractCegarLoop]: Interprodecural is true [2021-05-22 01:33:52,471 INFO L379 AbstractCegarLoop]: Hoare is false [2021-05-22 01:33:52,471 INFO L380 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-22 01:33:52,471 INFO L381 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-22 01:33:52,471 INFO L382 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-22 01:33:52,471 INFO L383 AbstractCegarLoop]: Difference is false [2021-05-22 01:33:52,471 INFO L384 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-22 01:33:52,471 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == InUseError======== [2021-05-22 01:33:52,472 INFO L100 iNet2FiniteAutomaton]: Start petriNet2FiniteAutomaton. Operand has 16 places, 13 transitions, 31 flow [2021-05-22 01:33:52,475 INFO L122 iNet2FiniteAutomaton]: Finished petriNet2FiniteAutomaton. Result has 42 states, 37 states have (on average 1.7837837837837838) internal successors, (66), 41 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:33:52,475 INFO L276 IsEmpty]: Start isEmpty. Operand has 42 states, 37 states have (on average 1.7837837837837838) internal successors, (66), 41 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:33:52,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-05-22 01:33:52,476 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:33:52,476 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1] [2021-05-22 01:33:52,476 INFO L430 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION]=== [2021-05-22 01:33:52,481 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:33:52,481 INFO L82 PathProgramCache]: Analyzing trace with hash 268777336, now seen corresponding path program 1 times [2021-05-22 01:33:52,482 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:33:52,482 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1400827086] [2021-05-22 01:33:52,482 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:33:52,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-05-22 01:33:52,491 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-05-22 01:33:52,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-05-22 01:33:52,495 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-05-22 01:33:52,510 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-05-22 01:33:52,511 INFO L622 BasicCegarLoop]: Counterexample might be feasible [2021-05-22 01:33:52,511 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-22 01:33:52,512 INFO L315 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2021-05-22 01:33:52,512 WARN L242 ceAbstractionStarter]: 1 thread instances were not sufficient, I will increase this number and restart the analysis [2021-05-22 01:33:52,512 INFO L478 ceAbstractionStarter]: Constructing petrified ICFG for 2 thread instances. [2021-05-22 01:33:52,519 WARN L313 ript$VariableManager]: TermVariabe threadThread1of2ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-05-22 01:33:52,519 WARN L313 ript$VariableManager]: TermVariabe threadThread1of2ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-05-22 01:33:52,520 WARN L313 ript$VariableManager]: TermVariabe threadThread1of2ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-05-22 01:33:52,520 WARN L313 ript$VariableManager]: TermVariabe threadThread1of2ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-05-22 01:33:52,521 WARN L313 ript$VariableManager]: TermVariabe threadThread2of2ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-05-22 01:33:52,521 WARN L313 ript$VariableManager]: TermVariabe threadThread2of2ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-05-22 01:33:52,521 WARN L313 ript$VariableManager]: TermVariabe threadThread2of2ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-05-22 01:33:52,522 WARN L313 ript$VariableManager]: TermVariabe threadThread2of2ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-05-22 01:33:52,524 WARN L313 ript$VariableManager]: TermVariabe threadThread1of2ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-05-22 01:33:52,526 WARN L313 ript$VariableManager]: TermVariabe threadThread2of2ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-05-22 01:33:52,528 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-05-22 01:33:52,529 INFO L255 AbstractCegarLoop]: Starting to check reachability of 3 error locations. [2021-05-22 01:33:52,536 INFO L378 AbstractCegarLoop]: Interprodecural is true [2021-05-22 01:33:52,536 INFO L379 AbstractCegarLoop]: Hoare is false [2021-05-22 01:33:52,536 INFO L380 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-22 01:33:52,536 INFO L381 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-22 01:33:52,537 INFO L382 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-22 01:33:52,537 INFO L383 AbstractCegarLoop]: Difference is false [2021-05-22 01:33:52,537 INFO L384 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-22 01:33:52,537 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-22 01:33:52,539 INFO L100 iNet2FiniteAutomaton]: Start petriNet2FiniteAutomaton. Operand has 24 places, 19 transitions, 50 flow [2021-05-22 01:33:52,563 INFO L122 iNet2FiniteAutomaton]: Finished petriNet2FiniteAutomaton. Result has 252 states, 241 states have (on average 2.4937759336099585) internal successors, (601), 251 states have internal predecessors, (601), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:33:52,565 INFO L276 IsEmpty]: Start isEmpty. Operand has 252 states, 241 states have (on average 2.4937759336099585) internal successors, (601), 251 states have internal predecessors, (601), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:33:52,565 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-05-22 01:33:52,565 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:33:52,566 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:33:52,566 INFO L430 AbstractCegarLoop]: === Iteration 1 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:33:52,566 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:33:52,567 INFO L82 PathProgramCache]: Analyzing trace with hash 513720736, now seen corresponding path program 1 times [2021-05-22 01:33:52,567 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:33:52,567 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1855271161] [2021-05-22 01:33:52,567 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:33:52,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:33:52,663 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:33:52,663 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:33:52,663 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1855271161] [2021-05-22 01:33:52,664 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1855271161] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-22 01:33:52,664 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-22 01:33:52,664 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-22 01:33:52,664 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1559873808] [2021-05-22 01:33:52,664 INFO L462 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-22 01:33:52,665 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:33:52,665 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-22 01:33:52,665 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-05-22 01:33:52,666 INFO L87 Difference]: Start difference. First operand has 252 states, 241 states have (on average 2.4937759336099585) internal successors, (601), 251 states have internal predecessors, (601), 0 states have call successors, (0), 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 7 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 6 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:33:52,940 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:33:52,941 INFO L93 Difference]: Finished difference Result 497 states and 1072 transitions. [2021-05-22 01:33:52,941 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-22 01:33:52,941 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 6 states have internal predecessors, (7), 0 states have call successors, (0), 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 7 [2021-05-22 01:33:52,942 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:33:52,956 INFO L225 Difference]: With dead ends: 497 [2021-05-22 01:33:52,957 INFO L226 Difference]: Without dead ends: 327 [2021-05-22 01:33:52,957 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 156.4ms TimeCoverageRelationStatistics Valid=72, Invalid=138, Unknown=0, NotChecked=0, Total=210 [2021-05-22 01:33:52,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 327 states. [2021-05-22 01:33:53,007 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 327 to 217. [2021-05-22 01:33:53,007 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 217 states, 211 states have (on average 2.322274881516588) internal successors, (490), 216 states have internal predecessors, (490), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:33:53,008 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 217 states to 217 states and 490 transitions. [2021-05-22 01:33:53,009 INFO L78 Accepts]: Start accepts. Automaton has 217 states and 490 transitions. Word has length 7 [2021-05-22 01:33:53,009 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:33:53,009 INFO L482 AbstractCegarLoop]: Abstraction has 217 states and 490 transitions. [2021-05-22 01:33:53,009 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 7 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 6 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:33:53,009 INFO L276 IsEmpty]: Start isEmpty. Operand 217 states and 490 transitions. [2021-05-22 01:33:53,010 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-05-22 01:33:53,010 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:33:53,010 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:33:53,011 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-22 01:33:53,011 INFO L430 AbstractCegarLoop]: === Iteration 2 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:33:53,011 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:33:53,012 INFO L82 PathProgramCache]: Analyzing trace with hash 1047128168, now seen corresponding path program 1 times [2021-05-22 01:33:53,012 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:33:53,012 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2117716323] [2021-05-22 01:33:53,012 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:33:53,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:33:53,072 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-22 01:33:53,072 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:33:53,072 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2117716323] [2021-05-22 01:33:53,073 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2117716323] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:33:53,073 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1039856057] [2021-05-22 01:33:53,073 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) [2021-05-22 01:33:53,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:33:53,115 INFO L263 TraceCheckSpWp]: Trace formula consists of 19 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-22 01:33:53,117 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:33:53,294 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:33:53,294 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1039856057] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:33:53,295 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:33:53,295 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6] total 10 [2021-05-22 01:33:53,296 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1129554613] [2021-05-22 01:33:53,297 INFO L462 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-22 01:33:53,297 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:33:53,298 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-22 01:33:53,298 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2021-05-22 01:33:53,298 INFO L87 Difference]: Start difference. First operand 217 states and 490 transitions. Second operand has 12 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 11 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:33:53,571 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:33:53,571 INFO L93 Difference]: Finished difference Result 344 states and 671 transitions. [2021-05-22 01:33:53,572 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-22 01:33:53,572 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 11 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2021-05-22 01:33:53,572 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:33:53,574 INFO L225 Difference]: With dead ends: 344 [2021-05-22 01:33:53,574 INFO L226 Difference]: Without dead ends: 277 [2021-05-22 01:33:53,575 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 84 ImplicationChecksByTransitivity, 189.2ms TimeCoverageRelationStatistics Valid=149, Invalid=357, Unknown=0, NotChecked=0, Total=506 [2021-05-22 01:33:53,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 277 states. [2021-05-22 01:33:53,596 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 277 to 181. [2021-05-22 01:33:53,596 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 181 states, 175 states have (on average 2.2514285714285713) internal successors, (394), 180 states have internal predecessors, (394), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:33:53,597 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 394 transitions. [2021-05-22 01:33:53,597 INFO L78 Accepts]: Start accepts. Automaton has 181 states and 394 transitions. Word has length 10 [2021-05-22 01:33:53,598 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:33:53,598 INFO L482 AbstractCegarLoop]: Abstraction has 181 states and 394 transitions. [2021-05-22 01:33:53,598 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 12 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 11 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:33:53,598 INFO L276 IsEmpty]: Start isEmpty. Operand 181 states and 394 transitions. [2021-05-22 01:33:53,599 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-22 01:33:53,600 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:33:53,600 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:33:53,815 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:33:53,815 INFO L430 AbstractCegarLoop]: === Iteration 3 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:33:53,816 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:33:53,816 INFO L82 PathProgramCache]: Analyzing trace with hash 1267816994, now seen corresponding path program 1 times [2021-05-22 01:33:53,816 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:33:53,816 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [388477570] [2021-05-22 01:33:53,817 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:33:53,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:33:53,905 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:33:53,906 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:33:53,906 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [388477570] [2021-05-22 01:33:53,906 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [388477570] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:33:53,906 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [769125177] [2021-05-22 01:33:53,906 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:33:53,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:33:53,933 INFO L263 TraceCheckSpWp]: Trace formula consists of 23 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-22 01:33:53,934 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:33:54,094 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:33:54,095 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [769125177] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:33:54,095 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:33:54,095 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 15 [2021-05-22 01:33:54,095 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2076423323] [2021-05-22 01:33:54,095 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 01:33:54,096 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:33:54,097 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 01:33:54,097 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=220, Unknown=0, NotChecked=0, Total=272 [2021-05-22 01:33:54,097 INFO L87 Difference]: Start difference. First operand 181 states and 394 transitions. Second operand has 17 states, 16 states have (on average 1.4375) internal successors, (23), 16 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) [2021-05-22 01:33:54,685 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:33:54,685 INFO L93 Difference]: Finished difference Result 393 states and 790 transitions. [2021-05-22 01:33:54,685 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-22 01:33:54,686 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 1.4375) internal successors, (23), 16 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 12 [2021-05-22 01:33:54,686 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:33:54,687 INFO L225 Difference]: With dead ends: 393 [2021-05-22 01:33:54,687 INFO L226 Difference]: Without dead ends: 297 [2021-05-22 01:33:54,688 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 383 ImplicationChecksByTransitivity, 478.8ms TimeCoverageRelationStatistics Valid=402, Invalid=1238, Unknown=0, NotChecked=0, Total=1640 [2021-05-22 01:33:54,689 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 297 states. [2021-05-22 01:33:54,694 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 297 to 127. [2021-05-22 01:33:54,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 121 states have (on average 2.1404958677685952) internal successors, (259), 126 states have internal predecessors, (259), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:33:54,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 259 transitions. [2021-05-22 01:33:54,695 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 259 transitions. Word has length 12 [2021-05-22 01:33:54,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:33:54,695 INFO L482 AbstractCegarLoop]: Abstraction has 127 states and 259 transitions. [2021-05-22 01:33:54,696 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 16 states have (on average 1.4375) internal successors, (23), 16 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) [2021-05-22 01:33:54,696 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 259 transitions. [2021-05-22 01:33:54,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-22 01:33:54,699 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:33:54,700 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:33:54,912 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:33:54,913 INFO L430 AbstractCegarLoop]: === Iteration 4 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:33:54,913 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:33:54,913 INFO L82 PathProgramCache]: Analyzing trace with hash 1263055394, now seen corresponding path program 2 times [2021-05-22 01:33:54,914 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:33:54,914 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1904195750] [2021-05-22 01:33:54,914 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:33:54,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:33:54,984 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:33:54,984 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:33:54,985 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1904195750] [2021-05-22 01:33:54,985 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1904195750] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:33:54,985 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [22924723] [2021-05-22 01:33:54,985 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:33:55,010 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 01:33:55,010 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 01:33:55,010 INFO L263 TraceCheckSpWp]: Trace formula consists of 23 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-22 01:33:55,011 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:33:55,165 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:33:55,166 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [22924723] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:33:55,166 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:33:55,166 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 15 [2021-05-22 01:33:55,166 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1642884495] [2021-05-22 01:33:55,167 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 01:33:55,167 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:33:55,168 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 01:33:55,168 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=220, Unknown=0, NotChecked=0, Total=272 [2021-05-22 01:33:55,168 INFO L87 Difference]: Start difference. First operand 127 states and 259 transitions. Second operand has 17 states, 16 states have (on average 1.4375) internal successors, (23), 16 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) [2021-05-22 01:33:55,560 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:33:55,560 INFO L93 Difference]: Finished difference Result 255 states and 507 transitions. [2021-05-22 01:33:55,561 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-22 01:33:55,562 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 1.4375) internal successors, (23), 16 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 12 [2021-05-22 01:33:55,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:33:55,562 INFO L225 Difference]: With dead ends: 255 [2021-05-22 01:33:55,562 INFO L226 Difference]: Without dead ends: 148 [2021-05-22 01:33:55,563 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 167 ImplicationChecksByTransitivity, 288.5ms TimeCoverageRelationStatistics Valid=248, Invalid=682, Unknown=0, NotChecked=0, Total=930 [2021-05-22 01:33:55,564 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2021-05-22 01:33:55,565 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 120. [2021-05-22 01:33:55,565 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 120 states, 114 states have (on average 2.1491228070175437) internal successors, (245), 119 states have internal predecessors, (245), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:33:55,566 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 245 transitions. [2021-05-22 01:33:55,566 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 245 transitions. Word has length 12 [2021-05-22 01:33:55,566 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:33:55,566 INFO L482 AbstractCegarLoop]: Abstraction has 120 states and 245 transitions. [2021-05-22 01:33:55,566 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 16 states have (on average 1.4375) internal successors, (23), 16 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) [2021-05-22 01:33:55,567 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 245 transitions. [2021-05-22 01:33:55,567 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-22 01:33:55,567 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:33:55,567 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:33:55,786 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:33:55,786 INFO L430 AbstractCegarLoop]: === Iteration 5 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:33:55,786 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:33:55,787 INFO L82 PathProgramCache]: Analyzing trace with hash 1224329442, now seen corresponding path program 3 times [2021-05-22 01:33:55,787 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:33:55,787 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1538749199] [2021-05-22 01:33:55,787 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:33:55,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:33:55,833 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-22 01:33:55,837 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:33:55,838 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1538749199] [2021-05-22 01:33:55,838 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1538749199] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:33:55,838 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1331240001] [2021-05-22 01:33:55,838 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:33:55,867 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-22 01:33:55,868 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 01:33:55,868 INFO L263 TraceCheckSpWp]: Trace formula consists of 23 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-22 01:33:55,869 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:33:55,987 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:33:55,987 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1331240001] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:33:55,988 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:33:55,988 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8] total 14 [2021-05-22 01:33:55,988 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2146341218] [2021-05-22 01:33:55,988 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 01:33:55,988 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:33:55,988 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 01:33:55,989 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=193, Unknown=0, NotChecked=0, Total=240 [2021-05-22 01:33:55,989 INFO L87 Difference]: Start difference. First operand 120 states and 245 transitions. Second operand has 16 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 15 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) [2021-05-22 01:33:56,318 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:33:56,319 INFO L93 Difference]: Finished difference Result 261 states and 512 transitions. [2021-05-22 01:33:56,319 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-22 01:33:56,319 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 15 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 12 [2021-05-22 01:33:56,320 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:33:56,320 INFO L225 Difference]: With dead ends: 261 [2021-05-22 01:33:56,320 INFO L226 Difference]: Without dead ends: 147 [2021-05-22 01:33:56,321 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 179 ImplicationChecksByTransitivity, 257.1ms TimeCoverageRelationStatistics Valid=270, Invalid=722, Unknown=0, NotChecked=0, Total=992 [2021-05-22 01:33:56,322 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2021-05-22 01:33:56,324 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 119. [2021-05-22 01:33:56,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119 states, 113 states have (on average 2.150442477876106) internal successors, (243), 118 states have internal predecessors, (243), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:33:56,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 243 transitions. [2021-05-22 01:33:56,325 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 243 transitions. Word has length 12 [2021-05-22 01:33:56,325 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:33:56,325 INFO L482 AbstractCegarLoop]: Abstraction has 119 states and 243 transitions. [2021-05-22 01:33:56,325 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 15 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) [2021-05-22 01:33:56,325 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 243 transitions. [2021-05-22 01:33:56,326 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-22 01:33:56,326 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:33:56,326 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:33:56,549 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:33:56,549 INFO L430 AbstractCegarLoop]: === Iteration 6 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:33:56,549 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:33:56,550 INFO L82 PathProgramCache]: Analyzing trace with hash -1383215740, now seen corresponding path program 4 times [2021-05-22 01:33:56,550 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:33:56,550 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1938428214] [2021-05-22 01:33:56,550 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:33:56,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:33:56,595 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-22 01:33:56,595 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:33:56,595 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1938428214] [2021-05-22 01:33:56,595 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1938428214] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:33:56,595 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [667810377] [2021-05-22 01:33:56,595 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 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:33:56,616 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 01:33:56,616 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 01:33:56,617 INFO L263 TraceCheckSpWp]: Trace formula consists of 23 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-22 01:33:56,618 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:33:56,737 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:33:56,737 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [667810377] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:33:56,737 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:33:56,738 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8] total 14 [2021-05-22 01:33:56,738 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1552857180] [2021-05-22 01:33:56,738 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 01:33:56,738 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:33:56,738 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 01:33:56,739 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-05-22 01:33:56,739 INFO L87 Difference]: Start difference. First operand 119 states and 243 transitions. Second operand has 16 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 15 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) [2021-05-22 01:33:56,987 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:33:56,987 INFO L93 Difference]: Finished difference Result 92 states and 165 transitions. [2021-05-22 01:33:56,988 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-22 01:33:56,988 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 15 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 12 [2021-05-22 01:33:56,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:33:56,989 INFO L225 Difference]: With dead ends: 92 [2021-05-22 01:33:56,989 INFO L226 Difference]: Without dead ends: 0 [2021-05-22 01:33:56,989 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 126 ImplicationChecksByTransitivity, 242.6ms TimeCoverageRelationStatistics Valid=226, Invalid=586, Unknown=0, NotChecked=0, Total=812 [2021-05-22 01:33:56,989 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-05-22 01:33:56,989 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-05-22 01:33:56,990 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:33:56,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-05-22 01:33:56,990 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 12 [2021-05-22 01:33:56,990 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:33:56,990 INFO L482 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-05-22 01:33:56,990 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 15 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) [2021-05-22 01:33:56,990 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-05-22 01:33:56,990 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-05-22 01:33:57,212 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:33:57,212 INFO L315 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE (1/2) [2021-05-22 01:33:57,213 INFO L255 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-22 01:33:57,213 INFO L378 AbstractCegarLoop]: Interprodecural is true [2021-05-22 01:33:57,213 INFO L379 AbstractCegarLoop]: Hoare is false [2021-05-22 01:33:57,213 INFO L380 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-22 01:33:57,214 INFO L381 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-22 01:33:57,214 INFO L382 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-22 01:33:57,214 INFO L383 AbstractCegarLoop]: Difference is false [2021-05-22 01:33:57,214 INFO L384 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-22 01:33:57,214 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == InUseError======== [2021-05-22 01:33:57,214 INFO L100 iNet2FiniteAutomaton]: Start petriNet2FiniteAutomaton. Operand has 24 places, 19 transitions, 50 flow [2021-05-22 01:33:57,219 INFO L122 iNet2FiniteAutomaton]: Finished petriNet2FiniteAutomaton. Result has 252 states, 241 states have (on average 2.4937759336099585) internal successors, (601), 251 states have internal predecessors, (601), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:33:57,220 INFO L276 IsEmpty]: Start isEmpty. Operand has 252 states, 241 states have (on average 2.4937759336099585) internal successors, (601), 251 states have internal predecessors, (601), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:33:57,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-05-22 01:33:57,221 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:33:57,221 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1] [2021-05-22 01:33:57,221 INFO L430 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION]=== [2021-05-22 01:33:57,221 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:33:57,221 INFO L82 PathProgramCache]: Analyzing trace with hash 1047115182, now seen corresponding path program 1 times [2021-05-22 01:33:57,221 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:33:57,221 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1504194720] [2021-05-22 01:33:57,222 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:33:57,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-05-22 01:33:57,226 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-05-22 01:33:57,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-05-22 01:33:57,228 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-05-22 01:33:57,229 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-05-22 01:33:57,229 INFO L622 BasicCegarLoop]: Counterexample might be feasible [2021-05-22 01:33:57,229 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-05-22 01:33:57,230 INFO L315 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2021-05-22 01:33:57,230 WARN L242 ceAbstractionStarter]: 2 thread instances were not sufficient, I will increase this number and restart the analysis [2021-05-22 01:33:57,230 INFO L478 ceAbstractionStarter]: Constructing petrified ICFG for 3 thread instances. [2021-05-22 01:33:57,233 WARN L313 ript$VariableManager]: TermVariabe threadThread3of3ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-05-22 01:33:57,233 WARN L313 ript$VariableManager]: TermVariabe threadThread3of3ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-05-22 01:33:57,233 WARN L313 ript$VariableManager]: TermVariabe threadThread3of3ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-05-22 01:33:57,234 WARN L313 ript$VariableManager]: TermVariabe threadThread3of3ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-05-22 01:33:57,234 WARN L313 ript$VariableManager]: TermVariabe threadThread2of3ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-05-22 01:33:57,234 WARN L313 ript$VariableManager]: TermVariabe threadThread2of3ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-05-22 01:33:57,234 WARN L313 ript$VariableManager]: TermVariabe threadThread2of3ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-05-22 01:33:57,234 WARN L313 ript$VariableManager]: TermVariabe threadThread2of3ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-05-22 01:33:57,235 WARN L313 ript$VariableManager]: TermVariabe threadThread1of3ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-05-22 01:33:57,235 WARN L313 ript$VariableManager]: TermVariabe threadThread1of3ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-05-22 01:33:57,235 WARN L313 ript$VariableManager]: TermVariabe threadThread1of3ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-05-22 01:33:57,235 WARN L313 ript$VariableManager]: TermVariabe threadThread1of3ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-05-22 01:33:57,236 WARN L313 ript$VariableManager]: TermVariabe threadThread1of3ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-05-22 01:33:57,237 WARN L313 ript$VariableManager]: TermVariabe threadThread2of3ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-05-22 01:33:57,237 WARN L313 ript$VariableManager]: TermVariabe threadThread3of3ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-05-22 01:33:57,238 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-05-22 01:33:57,238 INFO L255 AbstractCegarLoop]: Starting to check reachability of 4 error locations. [2021-05-22 01:33:57,239 INFO L378 AbstractCegarLoop]: Interprodecural is true [2021-05-22 01:33:57,239 INFO L379 AbstractCegarLoop]: Hoare is false [2021-05-22 01:33:57,239 INFO L380 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-22 01:33:57,239 INFO L381 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-22 01:33:57,239 INFO L382 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-22 01:33:57,239 INFO L383 AbstractCegarLoop]: Difference is false [2021-05-22 01:33:57,240 INFO L384 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-22 01:33:57,240 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-22 01:33:57,241 INFO L100 iNet2FiniteAutomaton]: Start petriNet2FiniteAutomaton. Operand has 32 places, 25 transitions, 71 flow [2021-05-22 01:33:57,304 INFO L122 iNet2FiniteAutomaton]: Finished petriNet2FiniteAutomaton. Result has 1512 states, 1489 states have (on average 3.264607118871726) internal successors, (4861), 1511 states have internal predecessors, (4861), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:33:57,307 INFO L276 IsEmpty]: Start isEmpty. Operand has 1512 states, 1489 states have (on average 3.264607118871726) internal successors, (4861), 1511 states have internal predecessors, (4861), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:33:57,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-05-22 01:33:57,307 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:33:57,307 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:33:57,307 INFO L430 AbstractCegarLoop]: === Iteration 1 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:33:57,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:33:57,308 INFO L82 PathProgramCache]: Analyzing trace with hash 1966221566, now seen corresponding path program 1 times [2021-05-22 01:33:57,308 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:33:57,308 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1141617795] [2021-05-22 01:33:57,308 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:33:57,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:33:57,348 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:33:57,349 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:33:57,349 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1141617795] [2021-05-22 01:33:57,349 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1141617795] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-22 01:33:57,349 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-22 01:33:57,349 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-22 01:33:57,349 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2108696462] [2021-05-22 01:33:57,349 INFO L462 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-22 01:33:57,349 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:33:57,350 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-22 01:33:57,350 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-05-22 01:33:57,355 INFO L87 Difference]: Start difference. First operand has 1512 states, 1489 states have (on average 3.264607118871726) internal successors, (4861), 1511 states have internal predecessors, (4861), 0 states have call successors, (0), 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 7 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 6 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:33:57,559 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:33:57,560 INFO L93 Difference]: Finished difference Result 4185 states and 12022 transitions. [2021-05-22 01:33:57,560 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-22 01:33:57,560 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 6 states have internal predecessors, (7), 0 states have call successors, (0), 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 7 [2021-05-22 01:33:57,560 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:33:57,583 INFO L225 Difference]: With dead ends: 4185 [2021-05-22 01:33:57,583 INFO L226 Difference]: Without dead ends: 3603 [2021-05-22 01:33:57,583 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 65.0ms TimeCoverageRelationStatistics Valid=72, Invalid=138, Unknown=0, NotChecked=0, Total=210 [2021-05-22 01:33:57,608 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3603 states. [2021-05-22 01:33:57,661 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3603 to 1891. [2021-05-22 01:33:57,665 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1891 states, 1874 states have (on average 3.1376734258271077) internal successors, (5880), 1890 states have internal predecessors, (5880), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:33:57,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1891 states to 1891 states and 5880 transitions. [2021-05-22 01:33:57,675 INFO L78 Accepts]: Start accepts. Automaton has 1891 states and 5880 transitions. Word has length 7 [2021-05-22 01:33:57,675 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:33:57,675 INFO L482 AbstractCegarLoop]: Abstraction has 1891 states and 5880 transitions. [2021-05-22 01:33:57,675 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 7 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 6 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:33:57,675 INFO L276 IsEmpty]: Start isEmpty. Operand 1891 states and 5880 transitions. [2021-05-22 01:33:57,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-05-22 01:33:57,676 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:33:57,676 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:33:57,676 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-05-22 01:33:57,676 INFO L430 AbstractCegarLoop]: === Iteration 2 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:33:57,676 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:33:57,677 INFO L82 PathProgramCache]: Analyzing trace with hash 408196648, now seen corresponding path program 1 times [2021-05-22 01:33:57,677 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:33:57,677 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [720491646] [2021-05-22 01:33:57,677 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:33:57,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:33:57,704 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-22 01:33:57,704 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:33:57,704 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [720491646] [2021-05-22 01:33:57,705 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [720491646] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:33:57,705 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [153466007] [2021-05-22 01:33:57,705 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:33:57,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:33:57,736 INFO L263 TraceCheckSpWp]: Trace formula consists of 19 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-22 01:33:57,737 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:33:57,809 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:33:57,809 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [153466007] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:33:57,809 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:33:57,809 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6] total 10 [2021-05-22 01:33:57,809 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [354177842] [2021-05-22 01:33:57,810 INFO L462 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-22 01:33:57,810 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:33:57,810 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-22 01:33:57,810 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2021-05-22 01:33:57,810 INFO L87 Difference]: Start difference. First operand 1891 states and 5880 transitions. Second operand has 12 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 11 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:33:58,151 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:33:58,151 INFO L93 Difference]: Finished difference Result 5061 states and 14019 transitions. [2021-05-22 01:33:58,151 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-22 01:33:58,152 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 11 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2021-05-22 01:33:58,152 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:33:58,176 INFO L225 Difference]: With dead ends: 5061 [2021-05-22 01:33:58,176 INFO L226 Difference]: Without dead ends: 4805 [2021-05-22 01:33:58,176 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 84 ImplicationChecksByTransitivity, 139.6ms TimeCoverageRelationStatistics Valid=149, Invalid=357, Unknown=0, NotChecked=0, Total=506 [2021-05-22 01:33:58,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4805 states. [2021-05-22 01:33:58,284 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4805 to 2044. [2021-05-22 01:33:58,289 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2044 states, 2027 states have (on average 3.1174148988653183) internal successors, (6319), 2043 states have internal predecessors, (6319), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:33:58,299 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2044 states to 2044 states and 6319 transitions. [2021-05-22 01:33:58,299 INFO L78 Accepts]: Start accepts. Automaton has 2044 states and 6319 transitions. Word has length 10 [2021-05-22 01:33:58,299 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:33:58,299 INFO L482 AbstractCegarLoop]: Abstraction has 2044 states and 6319 transitions. [2021-05-22 01:33:58,300 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 12 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 11 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:33:58,300 INFO L276 IsEmpty]: Start isEmpty. Operand 2044 states and 6319 transitions. [2021-05-22 01:33:58,300 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-22 01:33:58,300 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:33:58,300 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:33:58,516 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:33:58,517 INFO L430 AbstractCegarLoop]: === Iteration 3 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:33:58,517 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:33:58,517 INFO L82 PathProgramCache]: Analyzing trace with hash 1819859788, now seen corresponding path program 1 times [2021-05-22 01:33:58,517 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:33:58,517 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1567350293] [2021-05-22 01:33:58,518 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:33:58,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:33:58,558 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-22 01:33:58,558 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:33:58,558 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1567350293] [2021-05-22 01:33:58,558 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1567350293] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:33:58,558 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1387804315] [2021-05-22 01:33:58,558 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 [2021-05-22 01:33:58,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:33:58,582 INFO L263 TraceCheckSpWp]: Trace formula consists of 23 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-22 01:33:58,583 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:33:58,688 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:33:58,688 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1387804315] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:33:58,688 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:33:58,688 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8] total 14 [2021-05-22 01:33:58,688 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1446417833] [2021-05-22 01:33:58,689 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 01:33:58,689 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:33:58,689 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 01:33:58,689 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=193, Unknown=0, NotChecked=0, Total=240 [2021-05-22 01:33:58,690 INFO L87 Difference]: Start difference. First operand 2044 states and 6319 transitions. Second operand has 16 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 15 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) [2021-05-22 01:33:59,537 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:33:59,538 INFO L93 Difference]: Finished difference Result 8669 states and 23530 transitions. [2021-05-22 01:33:59,538 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-05-22 01:33:59,538 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 15 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 12 [2021-05-22 01:33:59,538 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:33:59,580 INFO L225 Difference]: With dead ends: 8669 [2021-05-22 01:33:59,580 INFO L226 Difference]: Without dead ends: 8396 [2021-05-22 01:33:59,581 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 580 ImplicationChecksByTransitivity, 460.6ms TimeCoverageRelationStatistics Valid=561, Invalid=1601, Unknown=0, NotChecked=0, Total=2162 [2021-05-22 01:33:59,621 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8396 states. [2021-05-22 01:33:59,704 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8396 to 2150. [2021-05-22 01:33:59,709 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2150 states, 2133 states have (on average 3.123300515705579) internal successors, (6662), 2149 states have internal predecessors, (6662), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:33:59,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2150 states to 2150 states and 6662 transitions. [2021-05-22 01:33:59,716 INFO L78 Accepts]: Start accepts. Automaton has 2150 states and 6662 transitions. Word has length 12 [2021-05-22 01:33:59,717 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:33:59,717 INFO L482 AbstractCegarLoop]: Abstraction has 2150 states and 6662 transitions. [2021-05-22 01:33:59,717 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 15 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) [2021-05-22 01:33:59,717 INFO L276 IsEmpty]: Start isEmpty. Operand 2150 states and 6662 transitions. [2021-05-22 01:33:59,717 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-22 01:33:59,718 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:33:59,718 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:33:59,937 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:33:59,937 INFO L430 AbstractCegarLoop]: === Iteration 4 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:33:59,937 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:33:59,938 INFO L82 PathProgramCache]: Analyzing trace with hash 1434960332, now seen corresponding path program 2 times [2021-05-22 01:33:59,938 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:33:59,938 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1753004980] [2021-05-22 01:33:59,938 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:33:59,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:33:59,984 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:33:59,984 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:33:59,984 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1753004980] [2021-05-22 01:33:59,984 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1753004980] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:33:59,985 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [584149889] [2021-05-22 01:33:59,985 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 [2021-05-22 01:34:00,004 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 01:34:00,004 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 01:34:00,004 INFO L263 TraceCheckSpWp]: Trace formula consists of 23 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-22 01:34:00,005 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:34:00,127 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:34:00,127 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [584149889] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:34:00,127 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:34:00,127 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 15 [2021-05-22 01:34:00,127 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2133858017] [2021-05-22 01:34:00,127 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 01:34:00,128 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:34:00,128 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 01:34:00,128 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=220, Unknown=0, NotChecked=0, Total=272 [2021-05-22 01:34:00,128 INFO L87 Difference]: Start difference. First operand 2150 states and 6662 transitions. Second operand has 17 states, 16 states have (on average 1.4375) internal successors, (23), 16 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) [2021-05-22 01:34:01,193 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:34:01,193 INFO L93 Difference]: Finished difference Result 10276 states and 27703 transitions. [2021-05-22 01:34:01,193 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-05-22 01:34:01,193 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 1.4375) internal successors, (23), 16 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 12 [2021-05-22 01:34:01,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:34:01,223 INFO L225 Difference]: With dead ends: 10276 [2021-05-22 01:34:01,223 INFO L226 Difference]: Without dead ends: 9902 [2021-05-22 01:34:01,224 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1135 ImplicationChecksByTransitivity, 573.4ms TimeCoverageRelationStatistics Valid=883, Invalid=2657, Unknown=0, NotChecked=0, Total=3540 [2021-05-22 01:34:01,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9902 states. [2021-05-22 01:34:01,356 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9902 to 2061. [2021-05-22 01:34:01,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2061 states, 2044 states have (on average 3.0939334637964775) internal successors, (6324), 2060 states have internal predecessors, (6324), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:34:01,367 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2061 states to 2061 states and 6324 transitions. [2021-05-22 01:34:01,368 INFO L78 Accepts]: Start accepts. Automaton has 2061 states and 6324 transitions. Word has length 12 [2021-05-22 01:34:01,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:34:01,368 INFO L482 AbstractCegarLoop]: Abstraction has 2061 states and 6324 transitions. [2021-05-22 01:34:01,369 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 16 states have (on average 1.4375) internal successors, (23), 16 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) [2021-05-22 01:34:01,369 INFO L276 IsEmpty]: Start isEmpty. Operand 2061 states and 6324 transitions. [2021-05-22 01:34:01,370 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-22 01:34:01,370 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:34:01,370 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:34:01,588 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-05-22 01:34:01,589 INFO L430 AbstractCegarLoop]: === Iteration 5 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:34:01,589 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:34:01,589 INFO L82 PathProgramCache]: Analyzing trace with hash 35510376, now seen corresponding path program 3 times [2021-05-22 01:34:01,590 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:34:01,590 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1672670681] [2021-05-22 01:34:01,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:34:01,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:34:01,651 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-22 01:34:01,652 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:34:01,652 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1672670681] [2021-05-22 01:34:01,652 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1672670681] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:34:01,652 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [35559157] [2021-05-22 01:34:01,652 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 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:34:01,676 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-22 01:34:01,676 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 01:34:01,677 INFO L263 TraceCheckSpWp]: Trace formula consists of 23 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-22 01:34:01,677 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:34:01,815 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:34:01,815 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [35559157] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:34:01,815 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:34:01,815 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8] total 14 [2021-05-22 01:34:01,816 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1202361613] [2021-05-22 01:34:01,816 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 01:34:01,816 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:34:01,816 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 01:34:01,816 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=194, Unknown=0, NotChecked=0, Total=240 [2021-05-22 01:34:01,817 INFO L87 Difference]: Start difference. First operand 2061 states and 6324 transitions. Second operand has 16 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 15 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) [2021-05-22 01:34:02,633 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:34:02,633 INFO L93 Difference]: Finished difference Result 7635 states and 20327 transitions. [2021-05-22 01:34:02,633 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-05-22 01:34:02,633 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 15 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 12 [2021-05-22 01:34:02,634 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:34:02,652 INFO L225 Difference]: With dead ends: 7635 [2021-05-22 01:34:02,653 INFO L226 Difference]: Without dead ends: 7410 [2021-05-22 01:34:02,654 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 798 ImplicationChecksByTransitivity, 523.5ms TimeCoverageRelationStatistics Valid=667, Invalid=1985, Unknown=0, NotChecked=0, Total=2652 [2021-05-22 01:34:02,678 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7410 states. [2021-05-22 01:34:02,765 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7410 to 2030. [2021-05-22 01:34:02,769 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2030 states, 2013 states have (on average 3.085444610034774) internal successors, (6211), 2029 states have internal predecessors, (6211), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:34:02,775 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2030 states to 2030 states and 6211 transitions. [2021-05-22 01:34:02,775 INFO L78 Accepts]: Start accepts. Automaton has 2030 states and 6211 transitions. Word has length 12 [2021-05-22 01:34:02,775 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:34:02,775 INFO L482 AbstractCegarLoop]: Abstraction has 2030 states and 6211 transitions. [2021-05-22 01:34:02,776 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 15 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) [2021-05-22 01:34:02,776 INFO L276 IsEmpty]: Start isEmpty. Operand 2030 states and 6211 transitions. [2021-05-22 01:34:02,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-22 01:34:02,776 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:34:02,776 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:34:02,990 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:34:02,991 INFO L430 AbstractCegarLoop]: === Iteration 6 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:34:02,991 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:34:02,991 INFO L82 PathProgramCache]: Analyzing trace with hash -825742738, now seen corresponding path program 4 times [2021-05-22 01:34:02,991 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:34:02,991 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [342797440] [2021-05-22 01:34:02,991 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:34:02,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:34:03,047 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-22 01:34:03,048 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:34:03,048 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [342797440] [2021-05-22 01:34:03,048 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [342797440] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:34:03,048 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2136287406] [2021-05-22 01:34:03,048 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:34:03,067 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 01:34:03,067 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 01:34:03,068 INFO L263 TraceCheckSpWp]: Trace formula consists of 23 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-22 01:34:03,069 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:34:03,191 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:34:03,192 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2136287406] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:34:03,192 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:34:03,192 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8] total 14 [2021-05-22 01:34:03,192 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [928211535] [2021-05-22 01:34:03,192 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 01:34:03,192 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:34:03,193 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 01:34:03,193 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-05-22 01:34:03,193 INFO L87 Difference]: Start difference. First operand 2030 states and 6211 transitions. Second operand has 16 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 15 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) [2021-05-22 01:34:04,238 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:34:04,238 INFO L93 Difference]: Finished difference Result 8580 states and 22623 transitions. [2021-05-22 01:34:04,238 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-05-22 01:34:04,239 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 15 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 12 [2021-05-22 01:34:04,239 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:34:04,257 INFO L225 Difference]: With dead ends: 8580 [2021-05-22 01:34:04,257 INFO L226 Difference]: Without dead ends: 8393 [2021-05-22 01:34:04,258 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1453 ImplicationChecksByTransitivity, 609.4ms TimeCoverageRelationStatistics Valid=1000, Invalid=3160, Unknown=0, NotChecked=0, Total=4160 [2021-05-22 01:34:04,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8393 states. [2021-05-22 01:34:04,354 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8393 to 1752. [2021-05-22 01:34:04,364 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1752 states, 1738 states have (on average 3.0794016110471807) internal successors, (5352), 1751 states have internal predecessors, (5352), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:34:04,369 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1752 states to 1752 states and 5352 transitions. [2021-05-22 01:34:04,369 INFO L78 Accepts]: Start accepts. Automaton has 1752 states and 5352 transitions. Word has length 12 [2021-05-22 01:34:04,369 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:34:04,369 INFO L482 AbstractCegarLoop]: Abstraction has 1752 states and 5352 transitions. [2021-05-22 01:34:04,370 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 15 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) [2021-05-22 01:34:04,370 INFO L276 IsEmpty]: Start isEmpty. Operand 1752 states and 5352 transitions. [2021-05-22 01:34:04,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-05-22 01:34:04,371 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:34:04,371 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:34:04,594 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-22 01:34:04,594 INFO L430 AbstractCegarLoop]: === Iteration 7 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:34:04,595 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:34:04,595 INFO L82 PathProgramCache]: Analyzing trace with hash 1147369523, now seen corresponding path program 1 times [2021-05-22 01:34:04,595 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:34:04,595 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1089665192] [2021-05-22 01:34:04,595 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:34:04,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:34:04,629 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-05-22 01:34:04,630 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:34:04,630 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1089665192] [2021-05-22 01:34:04,630 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1089665192] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:34:04,630 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [329805546] [2021-05-22 01:34:04,630 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:34:04,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:34:04,654 INFO L263 TraceCheckSpWp]: Trace formula consists of 24 conjuncts, 8 conjunts are in the unsatisfiable core [2021-05-22 01:34:04,655 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:34:04,732 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:34:04,732 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [329805546] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:34:04,732 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:34:04,732 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 7] total 11 [2021-05-22 01:34:04,732 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1943148408] [2021-05-22 01:34:04,733 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-22 01:34:04,733 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:34:04,733 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-22 01:34:04,733 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=117, Unknown=0, NotChecked=0, Total=156 [2021-05-22 01:34:04,733 INFO L87 Difference]: Start difference. First operand 1752 states and 5352 transitions. Second operand has 13 states, 12 states have (on average 1.9166666666666667) 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) [2021-05-22 01:34:05,004 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:34:05,004 INFO L93 Difference]: Finished difference Result 4301 states and 11979 transitions. [2021-05-22 01:34:05,005 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-22 01:34:05,005 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 1.9166666666666667) 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 13 [2021-05-22 01:34:05,005 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:34:05,014 INFO L225 Difference]: With dead ends: 4301 [2021-05-22 01:34:05,014 INFO L226 Difference]: Without dead ends: 3986 [2021-05-22 01:34:05,014 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 104 ImplicationChecksByTransitivity, 144.9ms TimeCoverageRelationStatistics Valid=172, Invalid=428, Unknown=0, NotChecked=0, Total=600 [2021-05-22 01:34:05,027 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3986 states. [2021-05-22 01:34:05,062 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3986 to 1672. [2021-05-22 01:34:05,065 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1672 states, 1658 states have (on average 3.0554885404101326) internal successors, (5066), 1671 states have internal predecessors, (5066), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:34:05,068 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1672 states to 1672 states and 5066 transitions. [2021-05-22 01:34:05,069 INFO L78 Accepts]: Start accepts. Automaton has 1672 states and 5066 transitions. Word has length 13 [2021-05-22 01:34:05,070 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:34:05,070 INFO L482 AbstractCegarLoop]: Abstraction has 1672 states and 5066 transitions. [2021-05-22 01:34:05,070 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 13 states, 12 states have (on average 1.9166666666666667) 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) [2021-05-22 01:34:05,070 INFO L276 IsEmpty]: Start isEmpty. Operand 1672 states and 5066 transitions. [2021-05-22 01:34:05,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-22 01:34:05,071 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:34:05,071 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:34:05,284 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-05-22 01:34:05,285 INFO L430 AbstractCegarLoop]: === Iteration 8 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:34:05,285 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:34:05,285 INFO L82 PathProgramCache]: Analyzing trace with hash -315938114, now seen corresponding path program 1 times [2021-05-22 01:34:05,285 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:34:05,285 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [477886624] [2021-05-22 01:34:05,285 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:34:05,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:34:05,322 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-22 01:34:05,322 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:34:05,322 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [477886624] [2021-05-22 01:34:05,322 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [477886624] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:34:05,322 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1373461327] [2021-05-22 01:34:05,322 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:34:05,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:34:05,346 INFO L263 TraceCheckSpWp]: Trace formula consists of 28 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-22 01:34:05,346 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:34:05,472 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:34:05,473 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1373461327] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:34:05,473 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:34:05,473 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 15 [2021-05-22 01:34:05,473 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1909473194] [2021-05-22 01:34:05,473 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 01:34:05,473 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:34:05,474 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 01:34:05,474 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=219, Unknown=0, NotChecked=0, Total=272 [2021-05-22 01:34:05,474 INFO L87 Difference]: Start difference. First operand 1672 states and 5066 transitions. Second operand has 17 states, 16 states have (on average 1.6875) internal successors, (27), 16 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:34:06,346 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:34:06,347 INFO L93 Difference]: Finished difference Result 6916 states and 19316 transitions. [2021-05-22 01:34:06,347 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-05-22 01:34:06,347 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 1.6875) internal successors, (27), 16 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2021-05-22 01:34:06,347 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:34:06,360 INFO L225 Difference]: With dead ends: 6916 [2021-05-22 01:34:06,360 INFO L226 Difference]: Without dead ends: 6499 [2021-05-22 01:34:06,361 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 622 ImplicationChecksByTransitivity, 444.1ms TimeCoverageRelationStatistics Valid=587, Invalid=1863, Unknown=0, NotChecked=0, Total=2450 [2021-05-22 01:34:06,380 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6499 states. [2021-05-22 01:34:06,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6499 to 1889. [2021-05-22 01:34:06,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1889 states, 1875 states have (on average 3.0912) internal successors, (5796), 1888 states have internal predecessors, (5796), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:34:06,440 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1889 states to 1889 states and 5796 transitions. [2021-05-22 01:34:06,440 INFO L78 Accepts]: Start accepts. Automaton has 1889 states and 5796 transitions. Word has length 15 [2021-05-22 01:34:06,440 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:34:06,440 INFO L482 AbstractCegarLoop]: Abstraction has 1889 states and 5796 transitions. [2021-05-22 01:34:06,440 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 16 states have (on average 1.6875) internal successors, (27), 16 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:34:06,441 INFO L276 IsEmpty]: Start isEmpty. Operand 1889 states and 5796 transitions. [2021-05-22 01:34:06,442 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-22 01:34:06,442 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:34:06,442 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:34:06,665 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-05-22 01:34:06,665 INFO L430 AbstractCegarLoop]: === Iteration 9 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:34:06,665 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:34:06,666 INFO L82 PathProgramCache]: Analyzing trace with hash -1541673622, now seen corresponding path program 1 times [2021-05-22 01:34:06,666 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:34:06,666 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1982244478] [2021-05-22 01:34:06,666 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:34:06,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:34:06,740 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:34:06,740 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:34:06,741 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1982244478] [2021-05-22 01:34:06,741 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1982244478] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:34:06,741 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1414324585] [2021-05-22 01:34:06,741 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 [2021-05-22 01:34:06,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:34:06,767 INFO L263 TraceCheckSpWp]: Trace formula consists of 28 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-22 01:34:06,768 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:34:06,906 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:34:06,906 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1414324585] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:34:06,906 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:34:06,906 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 17 [2021-05-22 01:34:06,906 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1193306762] [2021-05-22 01:34:06,907 INFO L462 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-22 01:34:06,907 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:34:06,907 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-22 01:34:06,907 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=283, Unknown=0, NotChecked=0, Total=342 [2021-05-22 01:34:06,907 INFO L87 Difference]: Start difference. First operand 1889 states and 5796 transitions. Second operand has 19 states, 18 states have (on average 1.6111111111111112) internal successors, (29), 18 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) [2021-05-22 01:34:07,605 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:34:07,606 INFO L93 Difference]: Finished difference Result 6715 states and 19141 transitions. [2021-05-22 01:34:07,606 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-05-22 01:34:07,606 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 1.6111111111111112) internal successors, (29), 18 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) Word has length 15 [2021-05-22 01:34:07,606 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:34:07,615 INFO L225 Difference]: With dead ends: 6715 [2021-05-22 01:34:07,615 INFO L226 Difference]: Without dead ends: 5971 [2021-05-22 01:34:07,616 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 591 ImplicationChecksByTransitivity, 479.8ms TimeCoverageRelationStatistics Valid=590, Invalid=1860, Unknown=0, NotChecked=0, Total=2450 [2021-05-22 01:34:07,629 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5971 states. [2021-05-22 01:34:07,677 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5971 to 1994. [2021-05-22 01:34:07,679 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1994 states, 1980 states have (on average 3.0717171717171716) internal successors, (6082), 1993 states have internal predecessors, (6082), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:34:07,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1994 states to 1994 states and 6082 transitions. [2021-05-22 01:34:07,684 INFO L78 Accepts]: Start accepts. Automaton has 1994 states and 6082 transitions. Word has length 15 [2021-05-22 01:34:07,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:34:07,685 INFO L482 AbstractCegarLoop]: Abstraction has 1994 states and 6082 transitions. [2021-05-22 01:34:07,685 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 19 states, 18 states have (on average 1.6111111111111112) internal successors, (29), 18 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) [2021-05-22 01:34:07,685 INFO L276 IsEmpty]: Start isEmpty. Operand 1994 states and 6082 transitions. [2021-05-22 01:34:07,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-22 01:34:07,686 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:34:07,686 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:34:07,908 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-05-22 01:34:07,909 INFO L430 AbstractCegarLoop]: === Iteration 10 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:34:07,909 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:34:07,909 INFO L82 PathProgramCache]: Analyzing trace with hash -1184473124, now seen corresponding path program 2 times [2021-05-22 01:34:07,909 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:34:07,909 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [63215623] [2021-05-22 01:34:07,909 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:34:07,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:34:07,973 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:34:07,974 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:34:07,974 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [63215623] [2021-05-22 01:34:07,974 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [63215623] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:34:07,974 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [57286648] [2021-05-22 01:34:07,974 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 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 [2021-05-22 01:34:07,995 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 01:34:07,996 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 01:34:07,996 INFO L263 TraceCheckSpWp]: Trace formula consists of 28 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-22 01:34:07,997 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:34:08,116 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-22 01:34:08,117 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [57286648] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:34:08,117 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:34:08,117 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 16 [2021-05-22 01:34:08,117 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1814141055] [2021-05-22 01:34:08,117 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 01:34:08,117 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:34:08,118 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 01:34:08,118 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=255, Unknown=0, NotChecked=0, Total=306 [2021-05-22 01:34:08,118 INFO L87 Difference]: Start difference. First operand 1994 states and 6082 transitions. Second operand has 18 states, 17 states have (on average 1.7058823529411764) 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) [2021-05-22 01:34:08,926 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:34:08,926 INFO L93 Difference]: Finished difference Result 5741 states and 16399 transitions. [2021-05-22 01:34:08,926 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-22 01:34:08,926 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 1.7058823529411764) 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) Word has length 15 [2021-05-22 01:34:08,926 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:34:08,933 INFO L225 Difference]: With dead ends: 5741 [2021-05-22 01:34:08,933 INFO L226 Difference]: Without dead ends: 5279 [2021-05-22 01:34:08,934 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 350 ImplicationChecksByTransitivity, 448.3ms TimeCoverageRelationStatistics Valid=461, Invalid=1345, Unknown=0, NotChecked=0, Total=1806 [2021-05-22 01:34:08,944 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5279 states. [2021-05-22 01:34:08,987 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5279 to 1797. [2021-05-22 01:34:08,989 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1797 states, 1783 states have (on average 2.9938306225462705) internal successors, (5338), 1796 states have internal predecessors, (5338), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:34:08,993 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1797 states to 1797 states and 5338 transitions. [2021-05-22 01:34:08,994 INFO L78 Accepts]: Start accepts. Automaton has 1797 states and 5338 transitions. Word has length 15 [2021-05-22 01:34:08,994 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:34:08,994 INFO L482 AbstractCegarLoop]: Abstraction has 1797 states and 5338 transitions. [2021-05-22 01:34:08,994 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 17 states have (on average 1.7058823529411764) 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) [2021-05-22 01:34:08,994 INFO L276 IsEmpty]: Start isEmpty. Operand 1797 states and 5338 transitions. [2021-05-22 01:34:08,995 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-22 01:34:08,995 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:34:08,995 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:34:09,215 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:34:09,216 INFO L430 AbstractCegarLoop]: === Iteration 11 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:34:09,216 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:34:09,216 INFO L82 PathProgramCache]: Analyzing trace with hash -1184478094, now seen corresponding path program 2 times [2021-05-22 01:34:09,216 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:34:09,216 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1070448833] [2021-05-22 01:34:09,216 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:34:09,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:34:09,274 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:34:09,274 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:34:09,274 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1070448833] [2021-05-22 01:34:09,274 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1070448833] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:34:09,274 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1808396074] [2021-05-22 01:34:09,274 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 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 [2021-05-22 01:34:09,294 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 01:34:09,295 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 01:34:09,295 INFO L263 TraceCheckSpWp]: Trace formula consists of 28 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-22 01:34:09,296 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:34:09,413 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-22 01:34:09,414 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1808396074] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:34:09,414 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:34:09,414 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 16 [2021-05-22 01:34:09,414 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1052925960] [2021-05-22 01:34:09,414 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 01:34:09,414 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:34:09,414 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 01:34:09,415 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=255, Unknown=0, NotChecked=0, Total=306 [2021-05-22 01:34:09,415 INFO L87 Difference]: Start difference. First operand 1797 states and 5338 transitions. Second operand has 18 states, 17 states have (on average 1.7058823529411764) 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) [2021-05-22 01:34:10,135 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:34:10,135 INFO L93 Difference]: Finished difference Result 4136 states and 11633 transitions. [2021-05-22 01:34:10,136 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-22 01:34:10,136 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 1.7058823529411764) 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) Word has length 15 [2021-05-22 01:34:10,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:34:10,140 INFO L225 Difference]: With dead ends: 4136 [2021-05-22 01:34:10,141 INFO L226 Difference]: Without dead ends: 3737 [2021-05-22 01:34:10,141 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 332 ImplicationChecksByTransitivity, 405.2ms TimeCoverageRelationStatistics Valid=419, Invalid=1303, Unknown=0, NotChecked=0, Total=1722 [2021-05-22 01:34:10,149 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3737 states. [2021-05-22 01:34:10,175 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3737 to 1743. [2021-05-22 01:34:10,177 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1743 states, 1729 states have (on average 2.9467900520532098) internal successors, (5095), 1742 states have internal predecessors, (5095), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:34:10,181 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1743 states to 1743 states and 5095 transitions. [2021-05-22 01:34:10,181 INFO L78 Accepts]: Start accepts. Automaton has 1743 states and 5095 transitions. Word has length 15 [2021-05-22 01:34:10,182 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:34:10,182 INFO L482 AbstractCegarLoop]: Abstraction has 1743 states and 5095 transitions. [2021-05-22 01:34:10,182 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 17 states have (on average 1.7058823529411764) 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) [2021-05-22 01:34:10,182 INFO L276 IsEmpty]: Start isEmpty. Operand 1743 states and 5095 transitions. [2021-05-22 01:34:10,183 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-22 01:34:10,183 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:34:10,183 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:34:10,400 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:34:10,401 INFO L430 AbstractCegarLoop]: === Iteration 12 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:34:10,401 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:34:10,401 INFO L82 PathProgramCache]: Analyzing trace with hash 987378288, now seen corresponding path program 3 times [2021-05-22 01:34:10,401 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:34:10,401 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1406411055] [2021-05-22 01:34:10,401 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:34:10,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:34:10,455 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:34:10,455 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:34:10,455 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1406411055] [2021-05-22 01:34:10,455 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1406411055] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:34:10,455 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1010811833] [2021-05-22 01:34:10,455 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 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 [2021-05-22 01:34:10,476 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 01:34:10,476 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 01:34:10,476 INFO L263 TraceCheckSpWp]: Trace formula consists of 28 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-22 01:34:10,477 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:34:10,589 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:34:10,590 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1010811833] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:34:10,590 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:34:10,590 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 17 [2021-05-22 01:34:10,590 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2057480536] [2021-05-22 01:34:10,590 INFO L462 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-22 01:34:10,590 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:34:10,590 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-22 01:34:10,591 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=286, Unknown=0, NotChecked=0, Total=342 [2021-05-22 01:34:10,591 INFO L87 Difference]: Start difference. First operand 1743 states and 5095 transitions. Second operand has 19 states, 18 states have (on average 1.6111111111111112) internal successors, (29), 18 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) [2021-05-22 01:34:11,286 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:34:11,287 INFO L93 Difference]: Finished difference Result 6386 states and 17512 transitions. [2021-05-22 01:34:11,292 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-22 01:34:11,292 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 1.6111111111111112) internal successors, (29), 18 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) Word has length 15 [2021-05-22 01:34:11,292 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:34:11,302 INFO L225 Difference]: With dead ends: 6386 [2021-05-22 01:34:11,302 INFO L226 Difference]: Without dead ends: 5735 [2021-05-22 01:34:11,303 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 515 ImplicationChecksByTransitivity, 409.9ms TimeCoverageRelationStatistics Valid=522, Invalid=1734, Unknown=0, NotChecked=0, Total=2256 [2021-05-22 01:34:11,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5735 states. [2021-05-22 01:34:11,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5735 to 1437. [2021-05-22 01:34:11,351 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1437 states, 1423 states have (on average 2.904427266338721) internal successors, (4133), 1436 states have internal predecessors, (4133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:34:11,354 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1437 states to 1437 states and 4133 transitions. [2021-05-22 01:34:11,354 INFO L78 Accepts]: Start accepts. Automaton has 1437 states and 4133 transitions. Word has length 15 [2021-05-22 01:34:11,354 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:34:11,354 INFO L482 AbstractCegarLoop]: Abstraction has 1437 states and 4133 transitions. [2021-05-22 01:34:11,354 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 19 states, 18 states have (on average 1.6111111111111112) internal successors, (29), 18 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) [2021-05-22 01:34:11,354 INFO L276 IsEmpty]: Start isEmpty. Operand 1437 states and 4133 transitions. [2021-05-22 01:34:11,355 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-22 01:34:11,356 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:34:11,356 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:34:11,560 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:34:11,561 INFO L430 AbstractCegarLoop]: === Iteration 13 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:34:11,561 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:34:11,561 INFO L82 PathProgramCache]: Analyzing trace with hash 940951586, now seen corresponding path program 3 times [2021-05-22 01:34:11,561 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:34:11,561 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [75328358] [2021-05-22 01:34:11,561 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:34:11,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:34:11,602 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-22 01:34:11,603 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:34:11,603 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [75328358] [2021-05-22 01:34:11,603 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [75328358] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:34:11,603 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [493862253] [2021-05-22 01:34:11,603 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 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 [2021-05-22 01:34:11,623 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 01:34:11,623 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 01:34:11,623 INFO L263 TraceCheckSpWp]: Trace formula consists of 28 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-22 01:34:11,624 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:34:11,731 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:34:11,731 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [493862253] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:34:11,731 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:34:11,731 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 16 [2021-05-22 01:34:11,731 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [310372644] [2021-05-22 01:34:11,731 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 01:34:11,731 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:34:11,732 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 01:34:11,732 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-05-22 01:34:11,732 INFO L87 Difference]: Start difference. First operand 1437 states and 4133 transitions. Second operand has 18 states, 17 states have (on average 1.6470588235294117) internal successors, (28), 17 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:34:12,507 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:34:12,507 INFO L93 Difference]: Finished difference Result 4968 states and 13831 transitions. [2021-05-22 01:34:12,507 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-05-22 01:34:12,507 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 1.6470588235294117) internal successors, (28), 17 states have internal predecessors, (28), 0 states have call successors, (0), 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 15 [2021-05-22 01:34:12,507 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:34:12,513 INFO L225 Difference]: With dead ends: 4968 [2021-05-22 01:34:12,513 INFO L226 Difference]: Without dead ends: 4548 [2021-05-22 01:34:12,514 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 735 ImplicationChecksByTransitivity, 508.2ms TimeCoverageRelationStatistics Valid=672, Invalid=2190, Unknown=0, NotChecked=0, Total=2862 [2021-05-22 01:34:12,522 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4548 states. [2021-05-22 01:34:12,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4548 to 1390. [2021-05-22 01:34:12,549 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1390 states, 1376 states have (on average 2.914970930232558) internal successors, (4011), 1389 states have internal predecessors, (4011), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:34:12,552 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1390 states to 1390 states and 4011 transitions. [2021-05-22 01:34:12,552 INFO L78 Accepts]: Start accepts. Automaton has 1390 states and 4011 transitions. Word has length 15 [2021-05-22 01:34:12,552 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:34:12,552 INFO L482 AbstractCegarLoop]: Abstraction has 1390 states and 4011 transitions. [2021-05-22 01:34:12,552 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 17 states have (on average 1.6470588235294117) internal successors, (28), 17 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:34:12,552 INFO L276 IsEmpty]: Start isEmpty. Operand 1390 states and 4011 transitions. [2021-05-22 01:34:12,553 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-22 01:34:12,553 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:34:12,553 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:34:12,758 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-05-22 01:34:12,758 INFO L430 AbstractCegarLoop]: === Iteration 14 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:34:12,758 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:34:12,758 INFO L82 PathProgramCache]: Analyzing trace with hash 1484058716, now seen corresponding path program 4 times [2021-05-22 01:34:12,758 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:34:12,759 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [893359346] [2021-05-22 01:34:12,759 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:34:12,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:34:12,805 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-22 01:34:12,805 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:34:12,805 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [893359346] [2021-05-22 01:34:12,805 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [893359346] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:34:12,805 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [840776121] [2021-05-22 01:34:12,805 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 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:34:12,825 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 01:34:12,825 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 01:34:12,825 INFO L263 TraceCheckSpWp]: Trace formula consists of 28 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-22 01:34:12,826 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:34:12,923 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:34:12,923 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [840776121] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:34:12,923 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:34:12,923 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 16 [2021-05-22 01:34:12,923 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1722393167] [2021-05-22 01:34:12,923 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 01:34:12,923 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:34:12,924 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 01:34:12,924 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=246, Unknown=0, NotChecked=0, Total=306 [2021-05-22 01:34:12,924 INFO L87 Difference]: Start difference. First operand 1390 states and 4011 transitions. Second operand has 18 states, 17 states have (on average 1.6470588235294117) internal successors, (28), 17 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:34:13,730 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:34:13,731 INFO L93 Difference]: Finished difference Result 3673 states and 10129 transitions. [2021-05-22 01:34:13,731 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-05-22 01:34:13,731 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 1.6470588235294117) internal successors, (28), 17 states have internal predecessors, (28), 0 states have call successors, (0), 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 15 [2021-05-22 01:34:13,731 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:34:13,737 INFO L225 Difference]: With dead ends: 3673 [2021-05-22 01:34:13,737 INFO L226 Difference]: Without dead ends: 3469 [2021-05-22 01:34:13,739 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 818 ImplicationChecksByTransitivity, 548.1ms TimeCoverageRelationStatistics Valid=732, Invalid=2348, Unknown=0, NotChecked=0, Total=3080 [2021-05-22 01:34:13,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3469 states. [2021-05-22 01:34:13,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3469 to 1096. [2021-05-22 01:34:13,764 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1096 states, 1082 states have (on average 2.8632162661737524) internal successors, (3098), 1095 states have internal predecessors, (3098), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:34:13,766 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1096 states to 1096 states and 3098 transitions. [2021-05-22 01:34:13,766 INFO L78 Accepts]: Start accepts. Automaton has 1096 states and 3098 transitions. Word has length 15 [2021-05-22 01:34:13,766 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:34:13,766 INFO L482 AbstractCegarLoop]: Abstraction has 1096 states and 3098 transitions. [2021-05-22 01:34:13,766 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 17 states have (on average 1.6470588235294117) internal successors, (28), 17 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:34:13,766 INFO L276 IsEmpty]: Start isEmpty. Operand 1096 states and 3098 transitions. [2021-05-22 01:34:13,767 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-22 01:34:13,768 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:34:13,768 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:34:13,984 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-05-22 01:34:13,984 INFO L430 AbstractCegarLoop]: === Iteration 15 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:34:13,985 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:34:13,985 INFO L82 PathProgramCache]: Analyzing trace with hash 968950709, now seen corresponding path program 1 times [2021-05-22 01:34:13,985 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:34:13,985 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [374217306] [2021-05-22 01:34:13,985 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:34:13,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:34:14,046 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-22 01:34:14,046 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:34:14,046 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [374217306] [2021-05-22 01:34:14,046 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [374217306] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:34:14,046 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1054399061] [2021-05-22 01:34:14,046 INFO L95 rtionOrderModulation]: Keeping assertion order 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 [2021-05-22 01:34:14,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:34:14,067 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-22 01:34:14,068 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:34:14,210 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:34:14,211 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1054399061] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:34:14,211 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:34:14,211 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 19 [2021-05-22 01:34:14,211 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1602750958] [2021-05-22 01:34:14,211 INFO L462 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-22 01:34:14,211 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:34:14,212 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-22 01:34:14,212 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=356, Unknown=0, NotChecked=0, Total=420 [2021-05-22 01:34:14,212 INFO L87 Difference]: Start difference. First operand 1096 states and 3098 transitions. Second operand has 21 states, 20 states have (on average 1.55) internal successors, (31), 20 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:34:17,664 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:34:17,664 INFO L93 Difference]: Finished difference Result 10322 states and 26484 transitions. [2021-05-22 01:34:17,665 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 157 states. [2021-05-22 01:34:17,665 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 1.55) internal successors, (31), 20 states have internal predecessors, (31), 0 states have call successors, (0), 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 17 [2021-05-22 01:34:17,665 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:34:17,676 INFO L225 Difference]: With dead ends: 10322 [2021-05-22 01:34:17,676 INFO L226 Difference]: Without dead ends: 8749 [2021-05-22 01:34:17,681 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 170 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11769 ImplicationChecksByTransitivity, 2410.3ms TimeCoverageRelationStatistics Valid=4785, Invalid=24627, Unknown=0, NotChecked=0, Total=29412 [2021-05-22 01:34:17,703 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8749 states. [2021-05-22 01:34:17,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8749 to 1180. [2021-05-22 01:34:17,748 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1180 states, 1166 states have (on average 2.822469982847341) internal successors, (3291), 1179 states have internal predecessors, (3291), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:34:17,750 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1180 states to 1180 states and 3291 transitions. [2021-05-22 01:34:17,750 INFO L78 Accepts]: Start accepts. Automaton has 1180 states and 3291 transitions. Word has length 17 [2021-05-22 01:34:17,750 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:34:17,750 INFO L482 AbstractCegarLoop]: Abstraction has 1180 states and 3291 transitions. [2021-05-22 01:34:17,750 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 21 states, 20 states have (on average 1.55) internal successors, (31), 20 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:34:17,750 INFO L276 IsEmpty]: Start isEmpty. Operand 1180 states and 3291 transitions. [2021-05-22 01:34:17,752 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-22 01:34:17,752 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:34:17,752 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:34:17,976 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-05-22 01:34:17,976 INFO L430 AbstractCegarLoop]: === Iteration 16 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:34:17,976 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:34:17,976 INFO L82 PathProgramCache]: Analyzing trace with hash 1326146237, now seen corresponding path program 2 times [2021-05-22 01:34:17,976 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:34:17,976 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2046692802] [2021-05-22 01:34:17,977 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:34:17,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:34:18,029 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-22 01:34:18,029 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:34:18,029 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2046692802] [2021-05-22 01:34:18,029 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2046692802] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:34:18,029 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1987496624] [2021-05-22 01:34:18,029 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 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 [2021-05-22 01:34:18,073 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 01:34:18,073 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 01:34:18,074 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-22 01:34:18,074 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:34:18,241 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:34:18,241 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1987496624] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:34:18,241 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:34:18,241 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 19 [2021-05-22 01:34:18,241 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [72193336] [2021-05-22 01:34:18,242 INFO L462 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-22 01:34:18,242 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:34:18,242 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-22 01:34:18,242 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=351, Unknown=0, NotChecked=0, Total=420 [2021-05-22 01:34:18,242 INFO L87 Difference]: Start difference. First operand 1180 states and 3291 transitions. Second operand has 21 states, 20 states have (on average 1.55) internal successors, (31), 20 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:34:20,157 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:34:20,158 INFO L93 Difference]: Finished difference Result 6894 states and 17893 transitions. [2021-05-22 01:34:20,158 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2021-05-22 01:34:20,158 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 1.55) internal successors, (31), 20 states have internal predecessors, (31), 0 states have call successors, (0), 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 17 [2021-05-22 01:34:20,158 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:34:20,166 INFO L225 Difference]: With dead ends: 6894 [2021-05-22 01:34:20,166 INFO L226 Difference]: Without dead ends: 6517 [2021-05-22 01:34:20,167 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3352 ImplicationChecksByTransitivity, 1089.4ms TimeCoverageRelationStatistics Valid=1740, Invalid=7962, Unknown=0, NotChecked=0, Total=9702 [2021-05-22 01:34:20,180 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6517 states. [2021-05-22 01:34:20,213 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6517 to 1151. [2021-05-22 01:34:20,214 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1151 states, 1137 states have (on average 2.8346525945470535) internal successors, (3223), 1150 states have internal predecessors, (3223), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:34:20,217 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1151 states to 1151 states and 3223 transitions. [2021-05-22 01:34:20,217 INFO L78 Accepts]: Start accepts. Automaton has 1151 states and 3223 transitions. Word has length 17 [2021-05-22 01:34:20,217 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:34:20,217 INFO L482 AbstractCegarLoop]: Abstraction has 1151 states and 3223 transitions. [2021-05-22 01:34:20,217 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 21 states, 20 states have (on average 1.55) internal successors, (31), 20 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:34:20,217 INFO L276 IsEmpty]: Start isEmpty. Operand 1151 states and 3223 transitions. [2021-05-22 01:34:20,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-22 01:34:20,218 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:34:20,218 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:34:20,441 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-05-22 01:34:20,441 INFO L430 AbstractCegarLoop]: === Iteration 17 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:34:20,442 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:34:20,442 INFO L82 PathProgramCache]: Analyzing trace with hash -796964677, now seen corresponding path program 3 times [2021-05-22 01:34:20,442 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:34:20,442 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2000676992] [2021-05-22 01:34:20,442 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:34:20,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:34:20,493 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-22 01:34:20,493 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:34:20,493 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2000676992] [2021-05-22 01:34:20,493 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2000676992] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:34:20,493 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1256266851] [2021-05-22 01:34:20,493 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 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:34:20,514 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 01:34:20,514 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 01:34:20,514 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-22 01:34:20,515 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:34:20,649 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:34:20,649 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1256266851] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:34:20,649 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:34:20,649 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11] total 20 [2021-05-22 01:34:20,649 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1758949668] [2021-05-22 01:34:20,649 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-22 01:34:20,650 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:34:20,650 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-22 01:34:20,650 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=395, Unknown=0, NotChecked=0, Total=462 [2021-05-22 01:34:20,650 INFO L87 Difference]: Start difference. First operand 1151 states and 3223 transitions. Second operand has 22 states, 21 states have (on average 1.5238095238095237) internal successors, (32), 21 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) [2021-05-22 01:34:23,250 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:34:23,250 INFO L93 Difference]: Finished difference Result 10275 states and 26496 transitions. [2021-05-22 01:34:23,250 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 130 states. [2021-05-22 01:34:23,250 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 1.5238095238095237) internal successors, (32), 21 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) Word has length 17 [2021-05-22 01:34:23,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:34:23,262 INFO L225 Difference]: With dead ends: 10275 [2021-05-22 01:34:23,263 INFO L226 Difference]: Without dead ends: 9544 [2021-05-22 01:34:23,264 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 145 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8451 ImplicationChecksByTransitivity, 1835.4ms TimeCoverageRelationStatistics Valid=4325, Invalid=17137, Unknown=0, NotChecked=0, Total=21462 [2021-05-22 01:34:23,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9544 states. [2021-05-22 01:34:23,341 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9544 to 1138. [2021-05-22 01:34:23,342 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1138 states, 1124 states have (on average 2.8354092526690393) internal successors, (3187), 1137 states have internal predecessors, (3187), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:34:23,345 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1138 states to 1138 states and 3187 transitions. [2021-05-22 01:34:23,345 INFO L78 Accepts]: Start accepts. Automaton has 1138 states and 3187 transitions. Word has length 17 [2021-05-22 01:34:23,345 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:34:23,345 INFO L482 AbstractCegarLoop]: Abstraction has 1138 states and 3187 transitions. [2021-05-22 01:34:23,345 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 21 states have (on average 1.5238095238095237) internal successors, (32), 21 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) [2021-05-22 01:34:23,345 INFO L276 IsEmpty]: Start isEmpty. Operand 1138 states and 3187 transitions. [2021-05-22 01:34:23,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-22 01:34:23,346 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:34:23,346 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:34:23,560 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-05-22 01:34:23,561 INFO L430 AbstractCegarLoop]: === Iteration 18 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:34:23,561 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:34:23,561 INFO L82 PathProgramCache]: Analyzing trace with hash -1225057825, now seen corresponding path program 4 times [2021-05-22 01:34:23,561 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:34:23,561 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1996285088] [2021-05-22 01:34:23,561 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:34:23,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:34:23,611 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-22 01:34:23,611 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:34:23,611 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1996285088] [2021-05-22 01:34:23,611 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1996285088] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:34:23,611 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1086745031] [2021-05-22 01:34:23,611 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 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:34:23,630 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 01:34:23,631 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 01:34:23,631 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-22 01:34:23,632 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:34:23,762 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:34:23,763 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1086745031] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:34:23,763 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:34:23,763 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 19 [2021-05-22 01:34:23,763 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1889632887] [2021-05-22 01:34:23,763 INFO L462 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-22 01:34:23,763 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:34:23,764 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-22 01:34:23,764 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=348, Unknown=0, NotChecked=0, Total=420 [2021-05-22 01:34:23,764 INFO L87 Difference]: Start difference. First operand 1138 states and 3187 transitions. Second operand has 21 states, 20 states have (on average 1.6) internal successors, (32), 20 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) [2021-05-22 01:34:25,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:34:25,240 INFO L93 Difference]: Finished difference Result 5037 states and 12832 transitions. [2021-05-22 01:34:25,240 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2021-05-22 01:34:25,240 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 1.6) internal successors, (32), 20 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) Word has length 17 [2021-05-22 01:34:25,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:34:25,246 INFO L225 Difference]: With dead ends: 5037 [2021-05-22 01:34:25,246 INFO L226 Difference]: Without dead ends: 4775 [2021-05-22 01:34:25,247 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2751 ImplicationChecksByTransitivity, 927.2ms TimeCoverageRelationStatistics Valid=1574, Invalid=6258, Unknown=0, NotChecked=0, Total=7832 [2021-05-22 01:34:25,258 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4775 states. [2021-05-22 01:34:25,278 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4775 to 1123. [2021-05-22 01:34:25,279 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1123 states, 1109 states have (on average 2.848512173128945) internal successors, (3159), 1122 states have internal predecessors, (3159), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:34:25,281 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1123 states to 1123 states and 3159 transitions. [2021-05-22 01:34:25,281 INFO L78 Accepts]: Start accepts. Automaton has 1123 states and 3159 transitions. Word has length 17 [2021-05-22 01:34:25,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:34:25,281 INFO L482 AbstractCegarLoop]: Abstraction has 1123 states and 3159 transitions. [2021-05-22 01:34:25,282 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 21 states, 20 states have (on average 1.6) internal successors, (32), 20 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) [2021-05-22 01:34:25,282 INFO L276 IsEmpty]: Start isEmpty. Operand 1123 states and 3159 transitions. [2021-05-22 01:34:25,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-22 01:34:25,283 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:34:25,283 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:34:25,500 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:34:25,501 INFO L430 AbstractCegarLoop]: === Iteration 19 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:34:25,501 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:34:25,501 INFO L82 PathProgramCache]: Analyzing trace with hash 224899923, now seen corresponding path program 5 times [2021-05-22 01:34:25,501 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:34:25,501 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [436567501] [2021-05-22 01:34:25,501 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:34:25,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:34:25,558 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:34:25,558 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:34:25,559 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [436567501] [2021-05-22 01:34:25,559 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [436567501] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:34:25,559 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [701466069] [2021-05-22 01:34:25,559 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 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:34:25,580 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 01:34:25,580 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 01:34:25,580 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-22 01:34:25,581 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:34:25,724 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:34:25,724 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [701466069] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:34:25,724 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:34:25,724 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 21 [2021-05-22 01:34:25,724 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1201044672] [2021-05-22 01:34:25,725 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-22 01:34:25,725 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:34:25,725 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-22 01:34:25,725 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=431, Unknown=0, NotChecked=0, Total=506 [2021-05-22 01:34:25,725 INFO L87 Difference]: Start difference. First operand 1123 states and 3159 transitions. Second operand has 23 states, 22 states have (on average 1.5) internal successors, (33), 22 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:34:26,925 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:34:26,925 INFO L93 Difference]: Finished difference Result 5081 states and 13306 transitions. [2021-05-22 01:34:26,926 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2021-05-22 01:34:26,926 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 22 states have (on average 1.5) internal successors, (33), 22 states have internal predecessors, (33), 0 states have call successors, (0), 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 17 [2021-05-22 01:34:26,926 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:34:26,931 INFO L225 Difference]: With dead ends: 5081 [2021-05-22 01:34:26,931 INFO L226 Difference]: Without dead ends: 4469 [2021-05-22 01:34:26,932 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1908 ImplicationChecksByTransitivity, 788.5ms TimeCoverageRelationStatistics Valid=1343, Invalid=4977, Unknown=0, NotChecked=0, Total=6320 [2021-05-22 01:34:26,940 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4469 states. [2021-05-22 01:34:26,957 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4469 to 1155. [2021-05-22 01:34:26,958 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1155 states, 1141 states have (on average 2.832602979842244) internal successors, (3232), 1154 states have internal predecessors, (3232), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:34:26,961 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1155 states to 1155 states and 3232 transitions. [2021-05-22 01:34:26,961 INFO L78 Accepts]: Start accepts. Automaton has 1155 states and 3232 transitions. Word has length 17 [2021-05-22 01:34:26,961 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:34:26,961 INFO L482 AbstractCegarLoop]: Abstraction has 1155 states and 3232 transitions. [2021-05-22 01:34:26,961 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 22 states have (on average 1.5) internal successors, (33), 22 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:34:26,961 INFO L276 IsEmpty]: Start isEmpty. Operand 1155 states and 3232 transitions. [2021-05-22 01:34:26,962 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-22 01:34:26,963 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:34:26,963 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:34:27,176 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-05-22 01:34:27,177 INFO L430 AbstractCegarLoop]: === Iteration 20 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:34:27,177 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:34:27,177 INFO L82 PathProgramCache]: Analyzing trace with hash 215376723, now seen corresponding path program 6 times [2021-05-22 01:34:27,177 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:34:27,177 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1110295339] [2021-05-22 01:34:27,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:34:27,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:34:27,237 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:34:27,238 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:34:27,238 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1110295339] [2021-05-22 01:34:27,238 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1110295339] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:34:27,238 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1548808559] [2021-05-22 01:34:27,238 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 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:34:27,257 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 01:34:27,257 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 01:34:27,258 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-22 01:34:27,258 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:34:27,407 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:34:27,407 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1548808559] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:34:27,407 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:34:27,407 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 21 [2021-05-22 01:34:27,407 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2060309098] [2021-05-22 01:34:27,408 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-22 01:34:27,408 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:34:27,408 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-22 01:34:27,408 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=431, Unknown=0, NotChecked=0, Total=506 [2021-05-22 01:34:27,408 INFO L87 Difference]: Start difference. First operand 1155 states and 3232 transitions. Second operand has 23 states, 22 states have (on average 1.5) internal successors, (33), 22 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:34:28,976 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:34:28,976 INFO L93 Difference]: Finished difference Result 5995 states and 15370 transitions. [2021-05-22 01:34:28,976 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2021-05-22 01:34:28,976 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 22 states have (on average 1.5) internal successors, (33), 22 states have internal predecessors, (33), 0 states have call successors, (0), 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 17 [2021-05-22 01:34:28,976 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:34:28,983 INFO L225 Difference]: With dead ends: 5995 [2021-05-22 01:34:28,983 INFO L226 Difference]: Without dead ends: 5367 [2021-05-22 01:34:28,984 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3589 ImplicationChecksByTransitivity, 1056.3ms TimeCoverageRelationStatistics Valid=1947, Invalid=8559, Unknown=0, NotChecked=0, Total=10506 [2021-05-22 01:34:28,994 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5367 states. [2021-05-22 01:34:29,012 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5367 to 1127. [2021-05-22 01:34:29,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1127 states, 1113 states have (on average 2.8373764600179694) internal successors, (3158), 1126 states have internal predecessors, (3158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:34:29,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1127 states to 1127 states and 3158 transitions. [2021-05-22 01:34:29,015 INFO L78 Accepts]: Start accepts. Automaton has 1127 states and 3158 transitions. Word has length 17 [2021-05-22 01:34:29,015 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:34:29,015 INFO L482 AbstractCegarLoop]: Abstraction has 1127 states and 3158 transitions. [2021-05-22 01:34:29,015 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 22 states have (on average 1.5) internal successors, (33), 22 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:34:29,015 INFO L276 IsEmpty]: Start isEmpty. Operand 1127 states and 3158 transitions. [2021-05-22 01:34:29,016 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-22 01:34:29,016 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:34:29,016 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:34:29,220 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-05-22 01:34:29,221 INFO L430 AbstractCegarLoop]: === Iteration 21 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:34:29,221 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:34:29,221 INFO L82 PathProgramCache]: Analyzing trace with hash -340116773, now seen corresponding path program 7 times [2021-05-22 01:34:29,221 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:34:29,221 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [689315197] [2021-05-22 01:34:29,221 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:34:29,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:34:29,271 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-22 01:34:29,271 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:34:29,271 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [689315197] [2021-05-22 01:34:29,271 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [689315197] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:34:29,271 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [366263461] [2021-05-22 01:34:29,271 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 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:34:29,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:34:29,290 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-22 01:34:29,291 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:34:29,415 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:34:29,416 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [366263461] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:34:29,416 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:34:29,416 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 19 [2021-05-22 01:34:29,416 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1038809655] [2021-05-22 01:34:29,416 INFO L462 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-22 01:34:29,416 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:34:29,416 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-22 01:34:29,416 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=348, Unknown=0, NotChecked=0, Total=420 [2021-05-22 01:34:29,416 INFO L87 Difference]: Start difference. First operand 1127 states and 3158 transitions. Second operand has 21 states, 20 states have (on average 1.65) internal successors, (33), 20 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:34:30,052 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:34:30,053 INFO L93 Difference]: Finished difference Result 3426 states and 9034 transitions. [2021-05-22 01:34:30,053 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-05-22 01:34:30,053 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 1.65) internal successors, (33), 20 states have internal predecessors, (33), 0 states have call successors, (0), 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 17 [2021-05-22 01:34:30,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:34:30,057 INFO L225 Difference]: With dead ends: 3426 [2021-05-22 01:34:30,057 INFO L226 Difference]: Without dead ends: 3081 [2021-05-22 01:34:30,057 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 738 ImplicationChecksByTransitivity, 449.3ms TimeCoverageRelationStatistics Valid=633, Invalid=2229, Unknown=0, NotChecked=0, Total=2862 [2021-05-22 01:34:30,063 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3081 states. [2021-05-22 01:34:30,074 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3081 to 1123. [2021-05-22 01:34:30,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1123 states, 1109 states have (on average 2.841298467087466) internal successors, (3151), 1122 states have internal predecessors, (3151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:34:30,077 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1123 states to 1123 states and 3151 transitions. [2021-05-22 01:34:30,077 INFO L78 Accepts]: Start accepts. Automaton has 1123 states and 3151 transitions. Word has length 17 [2021-05-22 01:34:30,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:34:30,077 INFO L482 AbstractCegarLoop]: Abstraction has 1123 states and 3151 transitions. [2021-05-22 01:34:30,077 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 21 states, 20 states have (on average 1.65) internal successors, (33), 20 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:34:30,077 INFO L276 IsEmpty]: Start isEmpty. Operand 1123 states and 3151 transitions. [2021-05-22 01:34:30,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-22 01:34:30,078 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:34:30,078 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:34:30,283 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,26 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:34:30,284 INFO L430 AbstractCegarLoop]: === Iteration 22 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:34:30,284 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:34:30,284 INFO L82 PathProgramCache]: Analyzing trace with hash -112342949, now seen corresponding path program 8 times [2021-05-22 01:34:30,284 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:34:30,284 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [256731639] [2021-05-22 01:34:30,284 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:34:30,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:34:30,345 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:34:30,345 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:34:30,345 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [256731639] [2021-05-22 01:34:30,345 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [256731639] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:34:30,345 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1125896860] [2021-05-22 01:34:30,345 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 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:34:30,378 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 01:34:30,378 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 01:34:30,378 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-22 01:34:30,379 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:34:30,520 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:34:30,520 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1125896860] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:34:30,520 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:34:30,520 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 21 [2021-05-22 01:34:30,520 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1565432181] [2021-05-22 01:34:30,520 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-22 01:34:30,520 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:34:30,521 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-22 01:34:30,521 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=423, Unknown=0, NotChecked=0, Total=506 [2021-05-22 01:34:30,521 INFO L87 Difference]: Start difference. First operand 1123 states and 3151 transitions. Second operand has 23 states, 22 states have (on average 1.5) internal successors, (33), 22 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:34:31,462 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:34:31,462 INFO L93 Difference]: Finished difference Result 4283 states and 11040 transitions. [2021-05-22 01:34:31,462 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-05-22 01:34:31,462 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 22 states have (on average 1.5) internal successors, (33), 22 states have internal predecessors, (33), 0 states have call successors, (0), 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 17 [2021-05-22 01:34:31,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:34:31,467 INFO L225 Difference]: With dead ends: 4283 [2021-05-22 01:34:31,467 INFO L226 Difference]: Without dead ends: 4022 [2021-05-22 01:34:31,467 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1218 ImplicationChecksByTransitivity, 555.2ms TimeCoverageRelationStatistics Valid=906, Invalid=3384, Unknown=0, NotChecked=0, Total=4290 [2021-05-22 01:34:31,475 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4022 states. [2021-05-22 01:34:31,490 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4022 to 1114. [2021-05-22 01:34:31,491 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1114 states, 1100 states have (on average 2.8181818181818183) internal successors, (3100), 1113 states have internal predecessors, (3100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:34:31,492 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1114 states to 1114 states and 3100 transitions. [2021-05-22 01:34:31,492 INFO L78 Accepts]: Start accepts. Automaton has 1114 states and 3100 transitions. Word has length 17 [2021-05-22 01:34:31,492 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:34:31,492 INFO L482 AbstractCegarLoop]: Abstraction has 1114 states and 3100 transitions. [2021-05-22 01:34:31,492 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 22 states have (on average 1.5) internal successors, (33), 22 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:34:31,492 INFO L276 IsEmpty]: Start isEmpty. Operand 1114 states and 3100 transitions. [2021-05-22 01:34:31,493 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-22 01:34:31,493 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:34:31,493 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:34:31,696 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,27 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:34:31,697 INFO L430 AbstractCegarLoop]: === Iteration 23 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:34:31,697 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:34:31,697 INFO L82 PathProgramCache]: Analyzing trace with hash -117104549, now seen corresponding path program 9 times [2021-05-22 01:34:31,697 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:34:31,697 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [515202243] [2021-05-22 01:34:31,697 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:34:31,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:34:31,760 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:34:31,760 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:34:31,760 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [515202243] [2021-05-22 01:34:31,760 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [515202243] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:34:31,760 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [614751192] [2021-05-22 01:34:31,760 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 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:34:31,779 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 01:34:31,779 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 01:34:31,780 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-22 01:34:31,780 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:34:31,917 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:34:31,917 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [614751192] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:34:31,917 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:34:31,917 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 21 [2021-05-22 01:34:31,917 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [101288761] [2021-05-22 01:34:31,917 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-22 01:34:31,917 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:34:31,918 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-22 01:34:31,918 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=423, Unknown=0, NotChecked=0, Total=506 [2021-05-22 01:34:31,918 INFO L87 Difference]: Start difference. First operand 1114 states and 3100 transitions. Second operand has 23 states, 22 states have (on average 1.5) internal successors, (33), 22 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:34:33,048 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:34:33,049 INFO L93 Difference]: Finished difference Result 3935 states and 9986 transitions. [2021-05-22 01:34:33,049 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2021-05-22 01:34:33,049 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 22 states have (on average 1.5) internal successors, (33), 22 states have internal predecessors, (33), 0 states have call successors, (0), 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 17 [2021-05-22 01:34:33,049 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:34:33,053 INFO L225 Difference]: With dead ends: 3935 [2021-05-22 01:34:33,053 INFO L226 Difference]: Without dead ends: 3639 [2021-05-22 01:34:33,053 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1859 ImplicationChecksByTransitivity, 690.2ms TimeCoverageRelationStatistics Valid=1188, Invalid=4974, Unknown=0, NotChecked=0, Total=6162 [2021-05-22 01:34:33,060 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3639 states. [2021-05-22 01:34:33,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3639 to 1064. [2021-05-22 01:34:33,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1064 states, 1050 states have (on average 2.842857142857143) internal successors, (2985), 1063 states have internal predecessors, (2985), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:34:33,076 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1064 states to 1064 states and 2985 transitions. [2021-05-22 01:34:33,076 INFO L78 Accepts]: Start accepts. Automaton has 1064 states and 2985 transitions. Word has length 17 [2021-05-22 01:34:33,076 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:34:33,076 INFO L482 AbstractCegarLoop]: Abstraction has 1064 states and 2985 transitions. [2021-05-22 01:34:33,076 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 22 states have (on average 1.5) internal successors, (33), 22 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:34:33,076 INFO L276 IsEmpty]: Start isEmpty. Operand 1064 states and 2985 transitions. [2021-05-22 01:34:33,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-22 01:34:33,077 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:34:33,077 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:34:33,279 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable31 [2021-05-22 01:34:33,280 INFO L430 AbstractCegarLoop]: === Iteration 24 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:34:33,280 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:34:33,280 INFO L82 PathProgramCache]: Analyzing trace with hash -307704103, now seen corresponding path program 10 times [2021-05-22 01:34:33,280 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:34:33,280 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2103821233] [2021-05-22 01:34:33,280 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:34:33,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:34:33,342 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:34:33,343 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:34:33,343 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2103821233] [2021-05-22 01:34:33,343 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2103821233] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:34:33,343 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2006661668] [2021-05-22 01:34:33,343 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 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:34:33,380 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 01:34:33,380 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 01:34:33,380 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-22 01:34:33,381 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:34:33,536 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:34:33,536 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2006661668] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:34:33,536 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:34:33,536 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 21 [2021-05-22 01:34:33,537 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [408894773] [2021-05-22 01:34:33,537 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-22 01:34:33,537 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:34:33,537 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-22 01:34:33,537 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=434, Unknown=0, NotChecked=0, Total=506 [2021-05-22 01:34:33,537 INFO L87 Difference]: Start difference. First operand 1064 states and 2985 transitions. Second operand has 23 states, 22 states have (on average 1.5) internal successors, (33), 22 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:34:34,654 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:34:34,654 INFO L93 Difference]: Finished difference Result 5352 states and 13715 transitions. [2021-05-22 01:34:34,654 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2021-05-22 01:34:34,654 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 22 states have (on average 1.5) internal successors, (33), 22 states have internal predecessors, (33), 0 states have call successors, (0), 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 17 [2021-05-22 01:34:34,654 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:34:34,660 INFO L225 Difference]: With dead ends: 5352 [2021-05-22 01:34:34,660 INFO L226 Difference]: Without dead ends: 4731 [2021-05-22 01:34:34,660 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1642 ImplicationChecksByTransitivity, 782.3ms TimeCoverageRelationStatistics Valid=1382, Invalid=4470, Unknown=0, NotChecked=0, Total=5852 [2021-05-22 01:34:34,669 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4731 states. [2021-05-22 01:34:34,684 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4731 to 1055. [2021-05-22 01:34:34,685 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1055 states, 1041 states have (on average 2.8155619596541785) internal successors, (2931), 1054 states have internal predecessors, (2931), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:34:34,687 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1055 states to 1055 states and 2931 transitions. [2021-05-22 01:34:34,687 INFO L78 Accepts]: Start accepts. Automaton has 1055 states and 2931 transitions. Word has length 17 [2021-05-22 01:34:34,687 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:34:34,687 INFO L482 AbstractCegarLoop]: Abstraction has 1055 states and 2931 transitions. [2021-05-22 01:34:34,687 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 22 states have (on average 1.5) internal successors, (33), 22 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:34:34,687 INFO L276 IsEmpty]: Start isEmpty. Operand 1055 states and 2931 transitions. [2021-05-22 01:34:34,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-22 01:34:34,688 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:34:34,688 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:34:34,897 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,29 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:34:34,898 INFO L430 AbstractCegarLoop]: === Iteration 25 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:34:34,899 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:34:34,899 INFO L82 PathProgramCache]: Analyzing trace with hash -317227303, now seen corresponding path program 11 times [2021-05-22 01:34:34,899 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:34:34,899 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [6384824] [2021-05-22 01:34:34,899 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:34:34,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:34:34,964 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:34:34,964 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:34:34,964 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [6384824] [2021-05-22 01:34:34,964 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [6384824] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:34:34,964 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2092542417] [2021-05-22 01:34:34,964 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 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:34:34,984 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 01:34:34,984 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 01:34:34,985 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-22 01:34:34,985 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:34:35,130 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:34:35,130 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2092542417] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:34:35,130 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:34:35,131 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 21 [2021-05-22 01:34:35,131 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1284035239] [2021-05-22 01:34:35,131 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-22 01:34:35,131 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:34:35,131 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-22 01:34:35,131 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=434, Unknown=0, NotChecked=0, Total=506 [2021-05-22 01:34:35,131 INFO L87 Difference]: Start difference. First operand 1055 states and 2931 transitions. Second operand has 23 states, 22 states have (on average 1.5) internal successors, (33), 22 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:34:36,507 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:34:36,507 INFO L93 Difference]: Finished difference Result 4588 states and 11650 transitions. [2021-05-22 01:34:36,507 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2021-05-22 01:34:36,507 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 22 states have (on average 1.5) internal successors, (33), 22 states have internal predecessors, (33), 0 states have call successors, (0), 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 17 [2021-05-22 01:34:36,507 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:34:36,511 INFO L225 Difference]: With dead ends: 4588 [2021-05-22 01:34:36,511 INFO L226 Difference]: Without dead ends: 3990 [2021-05-22 01:34:36,512 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2309 ImplicationChecksByTransitivity, 903.6ms TimeCoverageRelationStatistics Valid=1581, Invalid=6075, Unknown=0, NotChecked=0, Total=7656 [2021-05-22 01:34:36,519 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3990 states. [2021-05-22 01:34:36,532 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3990 to 877. [2021-05-22 01:34:36,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 877 states, 863 states have (on average 2.7879490150637314) internal successors, (2406), 876 states have internal predecessors, (2406), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:34:36,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 877 states to 877 states and 2406 transitions. [2021-05-22 01:34:36,534 INFO L78 Accepts]: Start accepts. Automaton has 877 states and 2406 transitions. Word has length 17 [2021-05-22 01:34:36,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:34:36,534 INFO L482 AbstractCegarLoop]: Abstraction has 877 states and 2406 transitions. [2021-05-22 01:34:36,534 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 22 states have (on average 1.5) internal successors, (33), 22 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:34:36,534 INFO L276 IsEmpty]: Start isEmpty. Operand 877 states and 2406 transitions. [2021-05-22 01:34:36,534 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-22 01:34:36,534 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:34:36,535 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:34:36,748 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2021-05-22 01:34:36,749 INFO L430 AbstractCegarLoop]: === Iteration 26 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:34:36,749 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:34:36,749 INFO L82 PathProgramCache]: Analyzing trace with hash -872720799, now seen corresponding path program 12 times [2021-05-22 01:34:36,749 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:34:36,749 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1429042923] [2021-05-22 01:34:36,749 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:34:36,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:34:36,796 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-22 01:34:36,796 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:34:36,796 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1429042923] [2021-05-22 01:34:36,797 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1429042923] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:34:36,797 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1601876813] [2021-05-22 01:34:36,797 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 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:34:36,816 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 01:34:36,816 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 01:34:36,816 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-22 01:34:36,817 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:34:36,992 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:34:36,992 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1601876813] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:34:36,992 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:34:36,992 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 19 [2021-05-22 01:34:36,992 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1351431946] [2021-05-22 01:34:36,993 INFO L462 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-22 01:34:36,993 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:34:36,993 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-22 01:34:36,993 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=353, Unknown=0, NotChecked=0, Total=420 [2021-05-22 01:34:36,993 INFO L87 Difference]: Start difference. First operand 877 states and 2406 transitions. Second operand has 21 states, 20 states have (on average 1.65) internal successors, (33), 20 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:34:37,926 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:34:37,927 INFO L93 Difference]: Finished difference Result 3426 states and 8779 transitions. [2021-05-22 01:34:37,927 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-05-22 01:34:37,927 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 1.65) internal successors, (33), 20 states have internal predecessors, (33), 0 states have call successors, (0), 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 17 [2021-05-22 01:34:37,927 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:34:37,930 INFO L225 Difference]: With dead ends: 3426 [2021-05-22 01:34:37,930 INFO L226 Difference]: Without dead ends: 3081 [2021-05-22 01:34:37,931 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1265 ImplicationChecksByTransitivity, 639.8ms TimeCoverageRelationStatistics Valid=968, Invalid=3454, Unknown=0, NotChecked=0, Total=4422 [2021-05-22 01:34:37,936 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3081 states. [2021-05-22 01:34:37,947 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3081 to 873. [2021-05-22 01:34:37,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 873 states, 859 states have (on average 2.792782305005821) internal successors, (2399), 872 states have internal predecessors, (2399), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:34:37,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 873 states to 873 states and 2399 transitions. [2021-05-22 01:34:37,949 INFO L78 Accepts]: Start accepts. Automaton has 873 states and 2399 transitions. Word has length 17 [2021-05-22 01:34:37,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:34:37,949 INFO L482 AbstractCegarLoop]: Abstraction has 873 states and 2399 transitions. [2021-05-22 01:34:37,949 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 21 states, 20 states have (on average 1.65) internal successors, (33), 20 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:34:37,949 INFO L276 IsEmpty]: Start isEmpty. Operand 873 states and 2399 transitions. [2021-05-22 01:34:37,949 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-22 01:34:37,949 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:34:37,949 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:34:38,150 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34,31 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:34:38,150 INFO L430 AbstractCegarLoop]: === Iteration 27 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:34:38,150 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:34:38,150 INFO L82 PathProgramCache]: Analyzing trace with hash 381361351, now seen corresponding path program 13 times [2021-05-22 01:34:38,150 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:34:38,150 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2082383487] [2021-05-22 01:34:38,150 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:34:38,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:34:38,202 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-22 01:34:38,202 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:34:38,202 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2082383487] [2021-05-22 01:34:38,202 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2082383487] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:34:38,202 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1326489310] [2021-05-22 01:34:38,202 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 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:34:38,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:34:38,239 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-22 01:34:38,239 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:34:38,391 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:34:38,391 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1326489310] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:34:38,391 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:34:38,391 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 19 [2021-05-22 01:34:38,392 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1125185205] [2021-05-22 01:34:38,393 INFO L462 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-22 01:34:38,393 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:34:38,393 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-22 01:34:38,393 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=356, Unknown=0, NotChecked=0, Total=420 [2021-05-22 01:34:38,393 INFO L87 Difference]: Start difference. First operand 873 states and 2399 transitions. Second operand has 21 states, 20 states have (on average 1.6) internal successors, (32), 20 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) [2021-05-22 01:34:39,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:34:39,145 INFO L93 Difference]: Finished difference Result 2668 states and 6811 transitions. [2021-05-22 01:34:39,145 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-05-22 01:34:39,145 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 1.6) internal successors, (32), 20 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) Word has length 17 [2021-05-22 01:34:39,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:34:39,148 INFO L225 Difference]: With dead ends: 2668 [2021-05-22 01:34:39,148 INFO L226 Difference]: Without dead ends: 2353 [2021-05-22 01:34:39,148 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 667 ImplicationChecksByTransitivity, 546.2ms TimeCoverageRelationStatistics Valid=594, Invalid=2162, Unknown=0, NotChecked=0, Total=2756 [2021-05-22 01:34:39,153 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2353 states. [2021-05-22 01:34:39,163 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2353 to 858. [2021-05-22 01:34:39,163 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 858 states, 844 states have (on average 2.7950236966824646) internal successors, (2359), 857 states have internal predecessors, (2359), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:34:39,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 858 states to 858 states and 2359 transitions. [2021-05-22 01:34:39,164 INFO L78 Accepts]: Start accepts. Automaton has 858 states and 2359 transitions. Word has length 17 [2021-05-22 01:34:39,165 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:34:39,165 INFO L482 AbstractCegarLoop]: Abstraction has 858 states and 2359 transitions. [2021-05-22 01:34:39,165 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 21 states, 20 states have (on average 1.6) internal successors, (32), 20 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) [2021-05-22 01:34:39,165 INFO L276 IsEmpty]: Start isEmpty. Operand 858 states and 2359 transitions. [2021-05-22 01:34:39,165 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-22 01:34:39,165 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:34:39,165 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:34:39,365 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2021-05-22 01:34:39,366 INFO L430 AbstractCegarLoop]: === Iteration 28 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:34:39,366 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:34:39,366 INFO L82 PathProgramCache]: Analyzing trace with hash -821169831, now seen corresponding path program 14 times [2021-05-22 01:34:39,366 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:34:39,366 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1766636434] [2021-05-22 01:34:39,366 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:34:39,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:34:39,412 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-22 01:34:39,412 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:34:39,412 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1766636434] [2021-05-22 01:34:39,412 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1766636434] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:34:39,412 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [968715013] [2021-05-22 01:34:39,412 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 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:34:39,444 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 01:34:39,445 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 01:34:39,445 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-22 01:34:39,446 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:34:39,572 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:34:39,573 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [968715013] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:34:39,573 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:34:39,573 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 19 [2021-05-22 01:34:39,573 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1217853120] [2021-05-22 01:34:39,573 INFO L462 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-22 01:34:39,573 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:34:39,573 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-22 01:34:39,573 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=354, Unknown=0, NotChecked=0, Total=420 [2021-05-22 01:34:39,574 INFO L87 Difference]: Start difference. First operand 858 states and 2359 transitions. Second operand has 21 states, 20 states have (on average 1.65) internal successors, (33), 20 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:34:41,492 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:34:41,492 INFO L93 Difference]: Finished difference Result 5819 states and 14828 transitions. [2021-05-22 01:34:41,492 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2021-05-22 01:34:41,492 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 1.65) internal successors, (33), 20 states have internal predecessors, (33), 0 states have call successors, (0), 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 17 [2021-05-22 01:34:41,492 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:34:41,497 INFO L225 Difference]: With dead ends: 5819 [2021-05-22 01:34:41,497 INFO L226 Difference]: Without dead ends: 5006 [2021-05-22 01:34:41,498 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4301 ImplicationChecksByTransitivity, 1354.0ms TimeCoverageRelationStatistics Valid=2380, Invalid=10276, Unknown=0, NotChecked=0, Total=12656 [2021-05-22 01:34:41,507 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5006 states. [2021-05-22 01:34:41,522 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5006 to 935. [2021-05-22 01:34:41,523 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 935 states, 921 states have (on average 2.8393051031487513) internal successors, (2615), 934 states have internal predecessors, (2615), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:34:41,524 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 935 states to 935 states and 2615 transitions. [2021-05-22 01:34:41,524 INFO L78 Accepts]: Start accepts. Automaton has 935 states and 2615 transitions. Word has length 17 [2021-05-22 01:34:41,524 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:34:41,524 INFO L482 AbstractCegarLoop]: Abstraction has 935 states and 2615 transitions. [2021-05-22 01:34:41,524 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 21 states, 20 states have (on average 1.65) internal successors, (33), 20 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:34:41,524 INFO L276 IsEmpty]: Start isEmpty. Operand 935 states and 2615 transitions. [2021-05-22 01:34:41,525 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-22 01:34:41,525 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:34:41,525 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:34:41,725 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-05-22 01:34:41,725 INFO L430 AbstractCegarLoop]: === Iteration 29 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:34:41,725 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:34:41,725 INFO L82 PathProgramCache]: Analyzing trace with hash -1682422945, now seen corresponding path program 15 times [2021-05-22 01:34:41,726 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:34:41,726 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1419745764] [2021-05-22 01:34:41,726 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:34:41,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:34:41,780 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-22 01:34:41,780 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:34:41,780 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1419745764] [2021-05-22 01:34:41,780 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1419745764] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:34:41,780 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [133818191] [2021-05-22 01:34:41,780 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 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:34:41,799 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 01:34:41,799 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 01:34:41,799 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-22 01:34:41,800 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:34:41,930 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:34:41,930 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [133818191] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:34:41,931 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:34:41,931 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 19 [2021-05-22 01:34:41,931 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1113901671] [2021-05-22 01:34:41,931 INFO L462 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-22 01:34:41,931 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:34:41,931 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-22 01:34:41,931 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=348, Unknown=0, NotChecked=0, Total=420 [2021-05-22 01:34:41,931 INFO L87 Difference]: Start difference. First operand 935 states and 2615 transitions. Second operand has 21 states, 20 states have (on average 1.65) internal successors, (33), 20 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:34:43,506 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:34:43,506 INFO L93 Difference]: Finished difference Result 4438 states and 11478 transitions. [2021-05-22 01:34:43,507 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2021-05-22 01:34:43,507 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 1.65) internal successors, (33), 20 states have internal predecessors, (33), 0 states have call successors, (0), 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 17 [2021-05-22 01:34:43,507 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:34:43,511 INFO L225 Difference]: With dead ends: 4438 [2021-05-22 01:34:43,511 INFO L226 Difference]: Without dead ends: 3954 [2021-05-22 01:34:43,512 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2902 ImplicationChecksByTransitivity, 1007.7ms TimeCoverageRelationStatistics Valid=1735, Invalid=7007, Unknown=0, NotChecked=0, Total=8742 [2021-05-22 01:34:43,519 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3954 states. [2021-05-22 01:34:43,532 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3954 to 907. [2021-05-22 01:34:43,533 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 907 states, 893 states have (on average 2.861142217245241) internal successors, (2555), 906 states have internal predecessors, (2555), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:34:43,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 907 states to 907 states and 2555 transitions. [2021-05-22 01:34:43,534 INFO L78 Accepts]: Start accepts. Automaton has 907 states and 2555 transitions. Word has length 17 [2021-05-22 01:34:43,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:34:43,534 INFO L482 AbstractCegarLoop]: Abstraction has 907 states and 2555 transitions. [2021-05-22 01:34:43,534 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 21 states, 20 states have (on average 1.65) internal successors, (33), 20 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:34:43,534 INFO L276 IsEmpty]: Start isEmpty. Operand 907 states and 2555 transitions. [2021-05-22 01:34:43,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-22 01:34:43,535 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:34:43,535 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:34:43,735 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2021-05-22 01:34:43,735 INFO L430 AbstractCegarLoop]: === Iteration 30 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:34:43,736 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:34:43,736 INFO L82 PathProgramCache]: Analyzing trace with hash 1954142233, now seen corresponding path program 16 times [2021-05-22 01:34:43,736 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:34:43,736 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1010218873] [2021-05-22 01:34:43,736 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:34:43,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:34:43,788 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-22 01:34:43,788 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:34:43,788 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1010218873] [2021-05-22 01:34:43,788 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1010218873] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:34:43,788 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1709114409] [2021-05-22 01:34:43,788 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 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:34:43,810 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 01:34:43,811 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 01:34:43,811 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-22 01:34:43,811 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:34:43,963 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:34:43,963 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1709114409] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:34:43,964 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:34:43,964 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11] total 20 [2021-05-22 01:34:43,964 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [850661498] [2021-05-22 01:34:43,964 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-22 01:34:43,964 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:34:43,964 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-22 01:34:43,964 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=396, Unknown=0, NotChecked=0, Total=462 [2021-05-22 01:34:43,964 INFO L87 Difference]: Start difference. First operand 907 states and 2555 transitions. Second operand has 22 states, 21 states have (on average 1.5238095238095237) internal successors, (32), 21 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) [2021-05-22 01:34:45,409 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:34:45,409 INFO L93 Difference]: Finished difference Result 3573 states and 9223 transitions. [2021-05-22 01:34:45,409 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2021-05-22 01:34:45,410 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 1.5238095238095237) internal successors, (32), 21 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) Word has length 17 [2021-05-22 01:34:45,410 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:34:45,412 INFO L225 Difference]: With dead ends: 3573 [2021-05-22 01:34:45,412 INFO L226 Difference]: Without dead ends: 2462 [2021-05-22 01:34:45,412 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2198 ImplicationChecksByTransitivity, 1095.4ms TimeCoverageRelationStatistics Valid=1672, Invalid=5810, Unknown=0, NotChecked=0, Total=7482 [2021-05-22 01:34:45,417 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2462 states. [2021-05-22 01:34:45,425 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2462 to 833. [2021-05-22 01:34:45,426 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 833 states, 819 states have (on average 2.769230769230769) internal successors, (2268), 832 states have internal predecessors, (2268), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:34:45,427 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 833 states to 833 states and 2268 transitions. [2021-05-22 01:34:45,427 INFO L78 Accepts]: Start accepts. Automaton has 833 states and 2268 transitions. Word has length 17 [2021-05-22 01:34:45,427 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:34:45,427 INFO L482 AbstractCegarLoop]: Abstraction has 833 states and 2268 transitions. [2021-05-22 01:34:45,427 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 21 states have (on average 1.5238095238095237) internal successors, (32), 21 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) [2021-05-22 01:34:45,427 INFO L276 IsEmpty]: Start isEmpty. Operand 833 states and 2268 transitions. [2021-05-22 01:34:45,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-22 01:34:45,427 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:34:45,427 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:34:45,628 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-05-22 01:34:45,628 INFO L430 AbstractCegarLoop]: === Iteration 31 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:34:45,628 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:34:45,628 INFO L82 PathProgramCache]: Analyzing trace with hash -1983629535, now seen corresponding path program 17 times [2021-05-22 01:34:45,628 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:34:45,628 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [349701716] [2021-05-22 01:34:45,628 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:34:45,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:34:45,678 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-22 01:34:45,678 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:34:45,678 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [349701716] [2021-05-22 01:34:45,678 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [349701716] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:34:45,678 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [58945673] [2021-05-22 01:34:45,678 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 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:34:45,697 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 01:34:45,697 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 01:34:45,698 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-22 01:34:45,698 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:34:45,830 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:34:45,831 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [58945673] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:34:45,831 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:34:45,831 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11] total 20 [2021-05-22 01:34:45,831 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1499040049] [2021-05-22 01:34:45,831 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-22 01:34:45,831 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:34:45,831 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-22 01:34:45,831 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=391, Unknown=0, NotChecked=0, Total=462 [2021-05-22 01:34:45,831 INFO L87 Difference]: Start difference. First operand 833 states and 2268 transitions. Second operand has 22 states, 21 states have (on average 1.5238095238095237) internal successors, (32), 21 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) [2021-05-22 01:34:46,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:34:46,605 INFO L93 Difference]: Finished difference Result 2318 states and 6089 transitions. [2021-05-22 01:34:46,605 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-05-22 01:34:46,605 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 1.5238095238095237) internal successors, (32), 21 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) Word has length 17 [2021-05-22 01:34:46,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:34:46,607 INFO L225 Difference]: With dead ends: 2318 [2021-05-22 01:34:46,607 INFO L226 Difference]: Without dead ends: 1995 [2021-05-22 01:34:46,607 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 854 ImplicationChecksByTransitivity, 571.6ms TimeCoverageRelationStatistics Valid=865, Invalid=2675, Unknown=0, NotChecked=0, Total=3540 [2021-05-22 01:34:46,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1995 states. [2021-05-22 01:34:46,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1995 to 801. [2021-05-22 01:34:46,620 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 801 states, 787 states have (on average 2.7878017789072427) internal successors, (2194), 800 states have internal predecessors, (2194), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:34:46,621 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 801 states to 801 states and 2194 transitions. [2021-05-22 01:34:46,621 INFO L78 Accepts]: Start accepts. Automaton has 801 states and 2194 transitions. Word has length 17 [2021-05-22 01:34:46,621 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:34:46,621 INFO L482 AbstractCegarLoop]: Abstraction has 801 states and 2194 transitions. [2021-05-22 01:34:46,621 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 21 states have (on average 1.5238095238095237) internal successors, (32), 21 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) [2021-05-22 01:34:46,621 INFO L276 IsEmpty]: Start isEmpty. Operand 801 states and 2194 transitions. [2021-05-22 01:34:46,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-22 01:34:46,621 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:34:46,621 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:34:46,822 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2021-05-22 01:34:46,822 INFO L430 AbstractCegarLoop]: === Iteration 32 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:34:46,822 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:34:46,822 INFO L82 PathProgramCache]: Analyzing trace with hash 188226847, now seen corresponding path program 18 times [2021-05-22 01:34:46,822 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:34:46,822 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1871873895] [2021-05-22 01:34:46,822 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:34:46,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:34:46,876 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-22 01:34:46,876 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:34:46,876 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1871873895] [2021-05-22 01:34:46,876 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1871873895] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:34:46,877 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1816295357] [2021-05-22 01:34:46,877 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 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:34:46,895 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 01:34:46,895 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 01:34:46,896 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-22 01:34:46,896 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:34:47,051 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:34:47,052 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1816295357] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:34:47,052 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:34:47,052 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11] total 20 [2021-05-22 01:34:47,052 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1551103218] [2021-05-22 01:34:47,052 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-22 01:34:47,052 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:34:47,053 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-22 01:34:47,053 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=396, Unknown=0, NotChecked=0, Total=462 [2021-05-22 01:34:47,053 INFO L87 Difference]: Start difference. First operand 801 states and 2194 transitions. Second operand has 22 states, 21 states have (on average 1.5238095238095237) internal successors, (32), 21 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) [2021-05-22 01:34:47,959 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:34:47,959 INFO L93 Difference]: Finished difference Result 2435 states and 6205 transitions. [2021-05-22 01:34:47,960 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-05-22 01:34:47,960 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 1.5238095238095237) internal successors, (32), 21 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) Word has length 17 [2021-05-22 01:34:47,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:34:47,962 INFO L225 Difference]: With dead ends: 2435 [2021-05-22 01:34:47,962 INFO L226 Difference]: Without dead ends: 1818 [2021-05-22 01:34:47,962 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1071 ImplicationChecksByTransitivity, 743.4ms TimeCoverageRelationStatistics Valid=1113, Invalid=3047, Unknown=0, NotChecked=0, Total=4160 [2021-05-22 01:34:47,966 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1818 states. [2021-05-22 01:34:47,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1818 to 768. [2021-05-22 01:34:47,973 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 768 states, 754 states have (on average 2.8090185676392574) internal successors, (2118), 767 states have internal predecessors, (2118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:34:47,974 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 768 states to 768 states and 2118 transitions. [2021-05-22 01:34:47,974 INFO L78 Accepts]: Start accepts. Automaton has 768 states and 2118 transitions. Word has length 17 [2021-05-22 01:34:47,974 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:34:47,974 INFO L482 AbstractCegarLoop]: Abstraction has 768 states and 2118 transitions. [2021-05-22 01:34:47,974 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 21 states have (on average 1.5238095238095237) internal successors, (32), 21 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) [2021-05-22 01:34:47,974 INFO L276 IsEmpty]: Start isEmpty. Operand 768 states and 2118 transitions. [2021-05-22 01:34:47,975 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-22 01:34:47,975 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:34:47,975 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:34:48,175 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable40 [2021-05-22 01:34:48,175 INFO L430 AbstractCegarLoop]: === Iteration 33 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:34:48,175 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:34:48,175 INFO L82 PathProgramCache]: Analyzing trace with hash -239866301, now seen corresponding path program 19 times [2021-05-22 01:34:48,176 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:34:48,176 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [769316338] [2021-05-22 01:34:48,176 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:34:48,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:34:48,219 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-22 01:34:48,220 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:34:48,220 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [769316338] [2021-05-22 01:34:48,220 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [769316338] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:34:48,220 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [374594099] [2021-05-22 01:34:48,220 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 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:34:48,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:34:48,239 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-22 01:34:48,239 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:34:48,381 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:34:48,382 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [374594099] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:34:48,382 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:34:48,382 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 19 [2021-05-22 01:34:48,382 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [757472638] [2021-05-22 01:34:48,382 INFO L462 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-22 01:34:48,382 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:34:48,382 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-22 01:34:48,382 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=352, Unknown=0, NotChecked=0, Total=420 [2021-05-22 01:34:48,382 INFO L87 Difference]: Start difference. First operand 768 states and 2118 transitions. Second operand has 21 states, 20 states have (on average 1.6) internal successors, (32), 20 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) [2021-05-22 01:34:49,104 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:34:49,104 INFO L93 Difference]: Finished difference Result 2017 states and 5048 transitions. [2021-05-22 01:34:49,104 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-05-22 01:34:49,104 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 1.6) internal successors, (32), 20 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) Word has length 17 [2021-05-22 01:34:49,104 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:34:49,106 INFO L225 Difference]: With dead ends: 2017 [2021-05-22 01:34:49,106 INFO L226 Difference]: Without dead ends: 1544 [2021-05-22 01:34:49,106 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 853 ImplicationChecksByTransitivity, 537.3ms TimeCoverageRelationStatistics Valid=821, Invalid=2719, Unknown=0, NotChecked=0, Total=3540 [2021-05-22 01:34:49,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1544 states. [2021-05-22 01:34:49,116 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1544 to 726. [2021-05-22 01:34:49,117 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 726 states, 712 states have (on average 2.832865168539326) internal successors, (2017), 725 states have internal predecessors, (2017), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:34:49,118 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 726 states to 726 states and 2017 transitions. [2021-05-22 01:34:49,118 INFO L78 Accepts]: Start accepts. Automaton has 726 states and 2017 transitions. Word has length 17 [2021-05-22 01:34:49,118 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:34:49,118 INFO L482 AbstractCegarLoop]: Abstraction has 726 states and 2017 transitions. [2021-05-22 01:34:49,118 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 21 states, 20 states have (on average 1.6) internal successors, (32), 20 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) [2021-05-22 01:34:49,118 INFO L276 IsEmpty]: Start isEmpty. Operand 726 states and 2017 transitions. [2021-05-22 01:34:49,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-22 01:34:49,118 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:34:49,119 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:34:49,319 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable41 [2021-05-22 01:34:49,319 INFO L430 AbstractCegarLoop]: === Iteration 34 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:34:49,319 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:34:49,319 INFO L82 PathProgramCache]: Analyzing trace with hash -105915949, now seen corresponding path program 20 times [2021-05-22 01:34:49,319 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:34:49,320 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [941031375] [2021-05-22 01:34:49,320 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:34:49,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:34:49,384 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-22 01:34:49,384 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:34:49,384 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [941031375] [2021-05-22 01:34:49,384 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [941031375] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:34:49,384 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [558401091] [2021-05-22 01:34:49,384 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 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:34:49,431 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 01:34:49,431 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 01:34:49,432 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-22 01:34:49,432 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:34:49,576 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:34:49,576 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [558401091] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:34:49,576 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:34:49,576 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11] total 20 [2021-05-22 01:34:49,576 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1319909821] [2021-05-22 01:34:49,576 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-22 01:34:49,576 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:34:49,576 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-22 01:34:49,576 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=391, Unknown=0, NotChecked=0, Total=462 [2021-05-22 01:34:49,577 INFO L87 Difference]: Start difference. First operand 726 states and 2017 transitions. Second operand has 22 states, 21 states have (on average 1.5238095238095237) internal successors, (32), 21 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) [2021-05-22 01:34:50,166 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:34:50,166 INFO L93 Difference]: Finished difference Result 1658 states and 4211 transitions. [2021-05-22 01:34:50,166 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-22 01:34:50,167 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 1.5238095238095237) internal successors, (32), 21 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) Word has length 17 [2021-05-22 01:34:50,167 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:34:50,168 INFO L225 Difference]: With dead ends: 1658 [2021-05-22 01:34:50,168 INFO L226 Difference]: Without dead ends: 1346 [2021-05-22 01:34:50,168 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 530 ImplicationChecksByTransitivity, 487.3ms TimeCoverageRelationStatistics Valid=543, Invalid=1809, Unknown=0, NotChecked=0, Total=2352 [2021-05-22 01:34:50,172 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1346 states. [2021-05-22 01:34:50,180 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1346 to 714. [2021-05-22 01:34:50,180 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 714 states, 700 states have (on average 2.8014285714285716) internal successors, (1961), 713 states have internal predecessors, (1961), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:34:50,182 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 714 states to 714 states and 1961 transitions. [2021-05-22 01:34:50,182 INFO L78 Accepts]: Start accepts. Automaton has 714 states and 1961 transitions. Word has length 17 [2021-05-22 01:34:50,182 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:34:50,182 INFO L482 AbstractCegarLoop]: Abstraction has 714 states and 1961 transitions. [2021-05-22 01:34:50,182 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 21 states have (on average 1.5238095238095237) internal successors, (32), 21 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) [2021-05-22 01:34:50,182 INFO L276 IsEmpty]: Start isEmpty. Operand 714 states and 1961 transitions. [2021-05-22 01:34:50,182 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-22 01:34:50,183 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:34:50,183 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:34:50,404 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42,39 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:34:50,404 INFO L430 AbstractCegarLoop]: === Iteration 35 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:34:50,404 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:34:50,404 INFO L82 PathProgramCache]: Analyzing trace with hash 251279579, now seen corresponding path program 21 times [2021-05-22 01:34:50,404 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:34:50,404 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [876870975] [2021-05-22 01:34:50,404 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:34:50,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:34:50,456 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-22 01:34:50,456 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:34:50,456 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [876870975] [2021-05-22 01:34:50,456 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [876870975] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:34:50,456 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [762204251] [2021-05-22 01:34:50,456 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 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:34:50,476 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 01:34:50,476 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 01:34:50,476 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-22 01:34:50,476 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:34:50,593 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:34:50,593 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [762204251] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:34:50,593 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:34:50,593 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11] total 20 [2021-05-22 01:34:50,593 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1872286575] [2021-05-22 01:34:50,593 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-22 01:34:50,594 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:34:50,594 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-22 01:34:50,594 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=386, Unknown=0, NotChecked=0, Total=462 [2021-05-22 01:34:50,594 INFO L87 Difference]: Start difference. First operand 714 states and 1961 transitions. Second operand has 22 states, 21 states have (on average 1.5238095238095237) internal successors, (32), 21 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) [2021-05-22 01:34:51,107 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:34:51,108 INFO L93 Difference]: Finished difference Result 960 states and 2431 transitions. [2021-05-22 01:34:51,108 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-22 01:34:51,108 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 1.5238095238095237) internal successors, (32), 21 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) Word has length 17 [2021-05-22 01:34:51,108 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:34:51,109 INFO L225 Difference]: With dead ends: 960 [2021-05-22 01:34:51,109 INFO L226 Difference]: Without dead ends: 648 [2021-05-22 01:34:51,109 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 430 ImplicationChecksByTransitivity, 391.2ms TimeCoverageRelationStatistics Valid=469, Invalid=1601, Unknown=0, NotChecked=0, Total=2070 [2021-05-22 01:34:51,111 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 648 states. [2021-05-22 01:34:51,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 648 to 504. [2021-05-22 01:34:51,115 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 504 states, 490 states have (on average 2.710204081632653) internal successors, (1328), 503 states have internal predecessors, (1328), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:34:51,116 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 504 states to 504 states and 1328 transitions. [2021-05-22 01:34:51,116 INFO L78 Accepts]: Start accepts. Automaton has 504 states and 1328 transitions. Word has length 17 [2021-05-22 01:34:51,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:34:51,116 INFO L482 AbstractCegarLoop]: Abstraction has 504 states and 1328 transitions. [2021-05-22 01:34:51,116 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 21 states have (on average 1.5238095238095237) internal successors, (32), 21 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) [2021-05-22 01:34:51,116 INFO L276 IsEmpty]: Start isEmpty. Operand 504 states and 1328 transitions. [2021-05-22 01:34:51,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-22 01:34:51,116 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:34:51,116 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:34:51,317 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable43 [2021-05-22 01:34:51,317 INFO L430 AbstractCegarLoop]: === Iteration 36 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:34:51,317 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:34:51,317 INFO L82 PathProgramCache]: Analyzing trace with hash -1871831335, now seen corresponding path program 22 times [2021-05-22 01:34:51,317 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:34:51,317 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1609900609] [2021-05-22 01:34:51,317 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:34:51,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:34:51,371 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-22 01:34:51,372 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:34:51,372 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1609900609] [2021-05-22 01:34:51,372 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1609900609] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:34:51,372 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2076827310] [2021-05-22 01:34:51,372 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 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:34:51,391 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 01:34:51,391 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 01:34:51,391 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-22 01:34:51,392 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:34:51,522 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:34:51,523 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2076827310] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:34:51,523 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:34:51,523 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11] total 20 [2021-05-22 01:34:51,523 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2112752886] [2021-05-22 01:34:51,523 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-22 01:34:51,523 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:34:51,523 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-22 01:34:51,524 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=394, Unknown=0, NotChecked=0, Total=462 [2021-05-22 01:34:51,524 INFO L87 Difference]: Start difference. First operand 504 states and 1328 transitions. Second operand has 22 states, 21 states have (on average 1.5238095238095237) internal successors, (32), 21 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) [2021-05-22 01:34:51,950 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:34:51,951 INFO L93 Difference]: Finished difference Result 452 states and 1063 transitions. [2021-05-22 01:34:51,951 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-22 01:34:51,951 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 1.5238095238095237) internal successors, (32), 21 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) Word has length 17 [2021-05-22 01:34:51,951 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:34:51,951 INFO L225 Difference]: With dead ends: 452 [2021-05-22 01:34:51,951 INFO L226 Difference]: Without dead ends: 0 [2021-05-22 01:34:51,951 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 333 ImplicationChecksByTransitivity, 431.4ms TimeCoverageRelationStatistics Valid=423, Invalid=1383, Unknown=0, NotChecked=0, Total=1806 [2021-05-22 01:34:51,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-05-22 01:34:51,951 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-05-22 01:34:51,951 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:34:51,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-05-22 01:34:51,952 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 17 [2021-05-22 01:34:51,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:34:51,952 INFO L482 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-05-22 01:34:51,952 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 21 states have (on average 1.5238095238095237) internal successors, (32), 21 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) [2021-05-22 01:34:51,952 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-05-22 01:34:51,952 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-05-22 01:34:52,152 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44,41 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:34:52,152 INFO L315 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE (1/2) [2021-05-22 01:34:52,153 INFO L255 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-22 01:34:52,153 INFO L378 AbstractCegarLoop]: Interprodecural is true [2021-05-22 01:34:52,153 INFO L379 AbstractCegarLoop]: Hoare is false [2021-05-22 01:34:52,153 INFO L380 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-22 01:34:52,153 INFO L381 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-22 01:34:52,153 INFO L382 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-22 01:34:52,153 INFO L383 AbstractCegarLoop]: Difference is false [2021-05-22 01:34:52,153 INFO L384 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-22 01:34:52,153 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == InUseError======== [2021-05-22 01:34:52,154 INFO L100 iNet2FiniteAutomaton]: Start petriNet2FiniteAutomaton. Operand has 32 places, 25 transitions, 71 flow [2021-05-22 01:34:52,189 INFO L122 iNet2FiniteAutomaton]: Finished petriNet2FiniteAutomaton. Result has 1512 states, 1489 states have (on average 3.264607118871726) internal successors, (4861), 1511 states have internal predecessors, (4861), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:34:52,191 INFO L276 IsEmpty]: Start isEmpty. Operand has 1512 states, 1489 states have (on average 3.264607118871726) internal successors, (4861), 1511 states have internal predecessors, (4861), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:34:52,191 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-05-22 01:34:52,192 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:34:52,192 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1] [2021-05-22 01:34:52,192 INFO L430 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION]=== [2021-05-22 01:34:52,192 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:34:52,192 INFO L82 PathProgramCache]: Analyzing trace with hash 1147361507, now seen corresponding path program 1 times [2021-05-22 01:34:52,192 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:34:52,192 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [292946906] [2021-05-22 01:34:52,192 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:34:52,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-05-22 01:34:52,194 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-05-22 01:34:52,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-05-22 01:34:52,195 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-05-22 01:34:52,197 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-05-22 01:34:52,197 INFO L622 BasicCegarLoop]: Counterexample might be feasible [2021-05-22 01:34:52,197 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2021-05-22 01:34:52,197 INFO L315 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2021-05-22 01:34:52,197 WARN L242 ceAbstractionStarter]: 3 thread instances were not sufficient, I will increase this number and restart the analysis [2021-05-22 01:34:52,197 INFO L478 ceAbstractionStarter]: Constructing petrified ICFG for 4 thread instances. [2021-05-22 01:34:52,203 WARN L313 ript$VariableManager]: TermVariabe threadThread3of4ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-05-22 01:34:52,203 WARN L313 ript$VariableManager]: TermVariabe threadThread3of4ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-05-22 01:34:52,203 WARN L313 ript$VariableManager]: TermVariabe threadThread3of4ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-05-22 01:34:52,204 WARN L313 ript$VariableManager]: TermVariabe threadThread3of4ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-05-22 01:34:52,204 WARN L313 ript$VariableManager]: TermVariabe threadThread1of4ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-05-22 01:34:52,204 WARN L313 ript$VariableManager]: TermVariabe threadThread1of4ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-05-22 01:34:52,204 WARN L313 ript$VariableManager]: TermVariabe threadThread1of4ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-05-22 01:34:52,204 WARN L313 ript$VariableManager]: TermVariabe threadThread1of4ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-05-22 01:34:52,204 WARN L313 ript$VariableManager]: TermVariabe threadThread2of4ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-05-22 01:34:52,204 WARN L313 ript$VariableManager]: TermVariabe threadThread2of4ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-05-22 01:34:52,205 WARN L313 ript$VariableManager]: TermVariabe threadThread2of4ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-05-22 01:34:52,205 WARN L313 ript$VariableManager]: TermVariabe threadThread2of4ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-05-22 01:34:52,205 WARN L313 ript$VariableManager]: TermVariabe threadThread4of4ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-05-22 01:34:52,205 WARN L313 ript$VariableManager]: TermVariabe threadThread4of4ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-05-22 01:34:52,205 WARN L313 ript$VariableManager]: TermVariabe threadThread4of4ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-05-22 01:34:52,205 WARN L313 ript$VariableManager]: TermVariabe threadThread4of4ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-05-22 01:34:52,205 WARN L313 ript$VariableManager]: TermVariabe threadThread1of4ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-05-22 01:34:52,206 WARN L313 ript$VariableManager]: TermVariabe threadThread2of4ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-05-22 01:34:52,207 WARN L313 ript$VariableManager]: TermVariabe threadThread3of4ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-05-22 01:34:52,207 WARN L313 ript$VariableManager]: TermVariabe threadThread4of4ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-05-22 01:34:52,208 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-05-22 01:34:52,208 INFO L255 AbstractCegarLoop]: Starting to check reachability of 5 error locations. [2021-05-22 01:34:52,209 INFO L378 AbstractCegarLoop]: Interprodecural is true [2021-05-22 01:34:52,209 INFO L379 AbstractCegarLoop]: Hoare is false [2021-05-22 01:34:52,209 INFO L380 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-22 01:34:52,209 INFO L381 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-22 01:34:52,209 INFO L382 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-22 01:34:52,209 INFO L383 AbstractCegarLoop]: Difference is false [2021-05-22 01:34:52,209 INFO L384 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-22 01:34:52,209 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-22 01:34:52,210 INFO L100 iNet2FiniteAutomaton]: Start petriNet2FiniteAutomaton. Operand has 40 places, 31 transitions, 94 flow [2021-05-22 01:34:52,771 INFO L122 iNet2FiniteAutomaton]: Finished petriNet2FiniteAutomaton. Result has 9072 states, 9025 states have (on average 4.068808864265928) internal successors, (36721), 9071 states have internal predecessors, (36721), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:34:52,787 INFO L276 IsEmpty]: Start isEmpty. Operand has 9072 states, 9025 states have (on average 4.068808864265928) internal successors, (36721), 9071 states have internal predecessors, (36721), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:34:52,787 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-05-22 01:34:52,787 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:34:52,787 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:34:52,788 INFO L430 AbstractCegarLoop]: === Iteration 1 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:34:52,788 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:34:52,788 INFO L82 PathProgramCache]: Analyzing trace with hash 331295731, now seen corresponding path program 1 times [2021-05-22 01:34:52,788 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:34:52,788 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1622491501] [2021-05-22 01:34:52,788 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:34:52,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:34:52,808 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:34:52,808 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:34:52,808 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1622491501] [2021-05-22 01:34:52,808 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1622491501] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-22 01:34:52,808 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-22 01:34:52,808 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-22 01:34:52,809 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [512634228] [2021-05-22 01:34:52,809 INFO L462 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-22 01:34:52,809 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:34:52,809 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-22 01:34:52,809 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-05-22 01:34:52,826 INFO L87 Difference]: Start difference. First operand has 9072 states, 9025 states have (on average 4.068808864265928) internal successors, (36721), 9071 states have internal predecessors, (36721), 0 states have call successors, (0), 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 7 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 6 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:34:53,107 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:34:53,107 INFO L93 Difference]: Finished difference Result 29977 states and 108006 transitions. [2021-05-22 01:34:53,109 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-22 01:34:53,109 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 6 states have internal predecessors, (7), 0 states have call successors, (0), 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 7 [2021-05-22 01:34:53,109 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:34:53,175 INFO L225 Difference]: With dead ends: 29977 [2021-05-22 01:34:53,176 INFO L226 Difference]: Without dead ends: 28143 [2021-05-22 01:34:53,176 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 61.1ms TimeCoverageRelationStatistics Valid=72, Invalid=138, Unknown=0, NotChecked=0, Total=210 [2021-05-22 01:34:53,441 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28143 states. [2021-05-22 01:34:53,741 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28143 to 13687. [2021-05-22 01:34:53,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13687 states, 13647 states have (on average 3.922400527588481) internal successors, (53529), 13686 states have internal predecessors, (53529), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:34:53,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13687 states to 13687 states and 53529 transitions. [2021-05-22 01:34:53,794 INFO L78 Accepts]: Start accepts. Automaton has 13687 states and 53529 transitions. Word has length 7 [2021-05-22 01:34:53,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:34:53,794 INFO L482 AbstractCegarLoop]: Abstraction has 13687 states and 53529 transitions. [2021-05-22 01:34:53,794 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 7 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 6 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:34:53,794 INFO L276 IsEmpty]: Start isEmpty. Operand 13687 states and 53529 transitions. [2021-05-22 01:34:53,794 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-05-22 01:34:53,794 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:34:53,794 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:34:53,795 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2021-05-22 01:34:53,795 INFO L430 AbstractCegarLoop]: === Iteration 2 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:34:53,795 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:34:53,795 INFO L82 PathProgramCache]: Analyzing trace with hash -590120179, now seen corresponding path program 1 times [2021-05-22 01:34:53,795 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:34:53,795 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1651662496] [2021-05-22 01:34:53,795 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:34:53,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:34:53,815 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-22 01:34:53,815 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:34:53,815 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1651662496] [2021-05-22 01:34:53,815 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1651662496] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:34:53,815 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [878400154] [2021-05-22 01:34:53,815 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:34:53,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:34:53,833 INFO L263 TraceCheckSpWp]: Trace formula consists of 19 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-22 01:34:53,834 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:34:53,879 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:34:53,879 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [878400154] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:34:53,879 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:34:53,879 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6] total 10 [2021-05-22 01:34:53,879 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [352931118] [2021-05-22 01:34:53,880 INFO L462 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-22 01:34:53,880 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:34:53,880 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-22 01:34:53,880 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2021-05-22 01:34:53,880 INFO L87 Difference]: Start difference. First operand 13687 states and 53529 transitions. Second operand has 12 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 11 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:34:54,389 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:34:54,389 INFO L93 Difference]: Finished difference Result 43039 states and 152646 transitions. [2021-05-22 01:34:54,390 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-22 01:34:54,390 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 11 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2021-05-22 01:34:54,390 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:34:54,628 INFO L225 Difference]: With dead ends: 43039 [2021-05-22 01:34:54,629 INFO L226 Difference]: Without dead ends: 42197 [2021-05-22 01:34:54,629 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 210.4ms TimeCoverageRelationStatistics Valid=149, Invalid=357, Unknown=0, NotChecked=0, Total=506 [2021-05-22 01:34:54,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42197 states. [2021-05-22 01:34:55,265 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42197 to 15660. [2021-05-22 01:34:55,285 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15660 states, 15620 states have (on average 3.9289372599231753) internal successors, (61370), 15659 states have internal predecessors, (61370), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:34:55,414 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15660 states to 15660 states and 61370 transitions. [2021-05-22 01:34:55,415 INFO L78 Accepts]: Start accepts. Automaton has 15660 states and 61370 transitions. Word has length 10 [2021-05-22 01:34:55,415 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:34:55,415 INFO L482 AbstractCegarLoop]: Abstraction has 15660 states and 61370 transitions. [2021-05-22 01:34:55,415 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 12 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 11 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:34:55,415 INFO L276 IsEmpty]: Start isEmpty. Operand 15660 states and 61370 transitions. [2021-05-22 01:34:55,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-22 01:34:55,415 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:34:55,415 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:34:55,615 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2021-05-22 01:34:55,616 INFO L430 AbstractCegarLoop]: === Iteration 3 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:34:55,616 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:34:55,616 INFO L82 PathProgramCache]: Analyzing trace with hash 1450030414, now seen corresponding path program 1 times [2021-05-22 01:34:55,616 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:34:55,616 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1152516196] [2021-05-22 01:34:55,616 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:34:55,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:34:55,660 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-22 01:34:55,660 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:34:55,660 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1152516196] [2021-05-22 01:34:55,660 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1152516196] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:34:55,660 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1126367291] [2021-05-22 01:34:55,660 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:34:55,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:34:55,695 INFO L263 TraceCheckSpWp]: Trace formula consists of 23 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-22 01:34:55,695 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:34:55,779 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:34:55,780 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1126367291] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:34:55,780 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:34:55,780 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8] total 14 [2021-05-22 01:34:55,780 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1499757661] [2021-05-22 01:34:55,780 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 01:34:55,780 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:34:55,780 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 01:34:55,780 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-05-22 01:34:55,780 INFO L87 Difference]: Start difference. First operand 15660 states and 61370 transitions. Second operand has 16 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 15 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) [2021-05-22 01:34:57,283 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:34:57,283 INFO L93 Difference]: Finished difference Result 96602 states and 330749 transitions. [2021-05-22 01:34:57,284 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-05-22 01:34:57,284 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 15 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 12 [2021-05-22 01:34:57,284 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:34:57,733 INFO L225 Difference]: With dead ends: 96602 [2021-05-22 01:34:57,733 INFO L226 Difference]: Without dead ends: 95787 [2021-05-22 01:34:57,733 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1457 ImplicationChecksByTransitivity, 618.9ms TimeCoverageRelationStatistics Valid=1000, Invalid=3160, Unknown=0, NotChecked=0, Total=4160 [2021-05-22 01:34:58,182 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95787 states. [2021-05-22 01:34:58,912 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95787 to 17113. [2021-05-22 01:34:58,933 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17113 states, 17073 states have (on average 3.977156914426287) internal successors, (67902), 17112 states have internal predecessors, (67902), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:34:59,139 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17113 states to 17113 states and 67902 transitions. [2021-05-22 01:34:59,140 INFO L78 Accepts]: Start accepts. Automaton has 17113 states and 67902 transitions. Word has length 12 [2021-05-22 01:34:59,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:34:59,140 INFO L482 AbstractCegarLoop]: Abstraction has 17113 states and 67902 transitions. [2021-05-22 01:34:59,140 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 15 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) [2021-05-22 01:34:59,140 INFO L276 IsEmpty]: Start isEmpty. Operand 17113 states and 67902 transitions. [2021-05-22 01:34:59,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-22 01:34:59,140 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:34:59,140 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:34:59,341 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48 [2021-05-22 01:34:59,341 INFO L430 AbstractCegarLoop]: === Iteration 4 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:34:59,341 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:34:59,341 INFO L82 PathProgramCache]: Analyzing trace with hash -169812180, now seen corresponding path program 2 times [2021-05-22 01:34:59,341 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:34:59,341 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1626414103] [2021-05-22 01:34:59,341 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:34:59,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:34:59,379 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:34:59,379 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:34:59,379 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1626414103] [2021-05-22 01:34:59,379 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1626414103] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:34:59,379 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2001768409] [2021-05-22 01:34:59,379 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 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:34:59,400 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 01:34:59,401 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 01:34:59,401 INFO L263 TraceCheckSpWp]: Trace formula consists of 23 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-22 01:34:59,402 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:34:59,489 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:34:59,489 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2001768409] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:34:59,489 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:34:59,489 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 15 [2021-05-22 01:34:59,489 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [604452070] [2021-05-22 01:34:59,489 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 01:34:59,489 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:34:59,490 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 01:34:59,490 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=220, Unknown=0, NotChecked=0, Total=272 [2021-05-22 01:34:59,490 INFO L87 Difference]: Start difference. First operand 17113 states and 67902 transitions. Second operand has 17 states, 16 states have (on average 1.4375) internal successors, (23), 16 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) [2021-05-22 01:34:59,842 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 13 [2021-05-22 01:35:00,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:35:00,941 INFO L93 Difference]: Finished difference Result 102029 states and 353544 transitions. [2021-05-22 01:35:00,942 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-05-22 01:35:00,942 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 1.4375) internal successors, (23), 16 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 12 [2021-05-22 01:35:00,942 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:35:01,425 INFO L225 Difference]: With dead ends: 102029 [2021-05-22 01:35:01,425 INFO L226 Difference]: Without dead ends: 100725 [2021-05-22 01:35:01,425 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1145 ImplicationChecksByTransitivity, 586.0ms TimeCoverageRelationStatistics Valid=883, Invalid=2657, Unknown=0, NotChecked=0, Total=3540 [2021-05-22 01:35:01,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100725 states. [2021-05-22 01:35:02,700 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100725 to 15782. [2021-05-22 01:35:02,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15782 states, 15745 states have (on average 3.9103842489679264) internal successors, (61569), 15781 states have internal predecessors, (61569), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:35:02,760 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15782 states to 15782 states and 61569 transitions. [2021-05-22 01:35:02,761 INFO L78 Accepts]: Start accepts. Automaton has 15782 states and 61569 transitions. Word has length 12 [2021-05-22 01:35:02,761 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:35:02,761 INFO L482 AbstractCegarLoop]: Abstraction has 15782 states and 61569 transitions. [2021-05-22 01:35:02,761 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 16 states have (on average 1.4375) internal successors, (23), 16 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) [2021-05-22 01:35:02,761 INFO L276 IsEmpty]: Start isEmpty. Operand 15782 states and 61569 transitions. [2021-05-22 01:35:02,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-05-22 01:35:02,761 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:35:02,761 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:35:02,964 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2021-05-22 01:35:02,965 INFO L430 AbstractCegarLoop]: === Iteration 5 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:35:02,965 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:35:02,965 INFO L82 PathProgramCache]: Analyzing trace with hash -1503398707, now seen corresponding path program 1 times [2021-05-22 01:35:02,965 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:35:02,965 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1990572438] [2021-05-22 01:35:02,965 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:35:02,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:35:02,986 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-05-22 01:35:02,986 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:35:02,986 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1990572438] [2021-05-22 01:35:02,986 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1990572438] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:35:02,986 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [883355754] [2021-05-22 01:35:02,986 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:35:03,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:35:03,005 INFO L263 TraceCheckSpWp]: Trace formula consists of 24 conjuncts, 8 conjunts are in the unsatisfiable core [2021-05-22 01:35:03,005 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:35:03,074 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:35:03,075 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [883355754] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:35:03,075 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:35:03,075 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 7] total 11 [2021-05-22 01:35:03,075 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [580794026] [2021-05-22 01:35:03,075 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-22 01:35:03,075 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:35:03,075 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-22 01:35:03,075 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=117, Unknown=0, NotChecked=0, Total=156 [2021-05-22 01:35:03,075 INFO L87 Difference]: Start difference. First operand 15782 states and 61569 transitions. Second operand has 13 states, 12 states have (on average 1.9166666666666667) 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) [2021-05-22 01:35:03,649 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:35:03,649 INFO L93 Difference]: Finished difference Result 48279 states and 172275 transitions. [2021-05-22 01:35:03,649 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-22 01:35:03,649 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 1.9166666666666667) 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 13 [2021-05-22 01:35:03,650 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:35:03,768 INFO L225 Difference]: With dead ends: 48279 [2021-05-22 01:35:03,768 INFO L226 Difference]: Without dead ends: 47147 [2021-05-22 01:35:03,768 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 105 ImplicationChecksByTransitivity, 129.8ms TimeCoverageRelationStatistics Valid=172, Invalid=428, Unknown=0, NotChecked=0, Total=600 [2021-05-22 01:35:04,145 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47147 states. [2021-05-22 01:35:04,631 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47147 to 17412. [2021-05-22 01:35:04,651 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17412 states, 17375 states have (on average 3.9093525179856115) internal successors, (67925), 17411 states have internal predecessors, (67925), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:35:04,701 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17412 states to 17412 states and 67925 transitions. [2021-05-22 01:35:04,701 INFO L78 Accepts]: Start accepts. Automaton has 17412 states and 67925 transitions. Word has length 13 [2021-05-22 01:35:04,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:35:04,701 INFO L482 AbstractCegarLoop]: Abstraction has 17412 states and 67925 transitions. [2021-05-22 01:35:04,702 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 13 states, 12 states have (on average 1.9166666666666667) 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) [2021-05-22 01:35:04,702 INFO L276 IsEmpty]: Start isEmpty. Operand 17412 states and 67925 transitions. [2021-05-22 01:35:04,702 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-22 01:35:04,702 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:35:04,703 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:35:04,920 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable50 [2021-05-22 01:35:04,921 INFO L430 AbstractCegarLoop]: === Iteration 6 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:35:04,921 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:35:04,921 INFO L82 PathProgramCache]: Analyzing trace with hash -1459288340, now seen corresponding path program 1 times [2021-05-22 01:35:04,921 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:35:04,921 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [698419384] [2021-05-22 01:35:04,921 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:35:04,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:35:04,962 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-22 01:35:04,962 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:35:04,962 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [698419384] [2021-05-22 01:35:04,962 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [698419384] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:35:04,963 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [47149338] [2021-05-22 01:35:04,963 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:35:04,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:35:04,982 INFO L263 TraceCheckSpWp]: Trace formula consists of 28 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-22 01:35:04,983 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:35:05,086 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:35:05,086 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [47149338] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:35:05,086 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:35:05,086 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 16 [2021-05-22 01:35:05,086 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1601384394] [2021-05-22 01:35:05,087 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 01:35:05,087 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:35:05,087 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 01:35:05,087 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=246, Unknown=0, NotChecked=0, Total=306 [2021-05-22 01:35:05,087 INFO L87 Difference]: Start difference. First operand 17412 states and 67925 transitions. Second operand has 18 states, 17 states have (on average 1.6470588235294117) internal successors, (28), 17 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:35:06,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:35:06,573 INFO L93 Difference]: Finished difference Result 83381 states and 298658 transitions. [2021-05-22 01:35:06,573 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-05-22 01:35:06,573 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 1.6470588235294117) internal successors, (28), 17 states have internal predecessors, (28), 0 states have call successors, (0), 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 15 [2021-05-22 01:35:06,576 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:35:06,802 INFO L225 Difference]: With dead ends: 83381 [2021-05-22 01:35:06,802 INFO L226 Difference]: Without dead ends: 82631 [2021-05-22 01:35:06,803 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 977 ImplicationChecksByTransitivity, 615.2ms TimeCoverageRelationStatistics Valid=823, Invalid=2717, Unknown=0, NotChecked=0, Total=3540 [2021-05-22 01:35:07,346 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82631 states. [2021-05-22 01:35:08,043 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82631 to 18374. [2021-05-22 01:35:08,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18374 states, 18337 states have (on average 3.937830615695043) internal successors, (72208), 18373 states have internal predecessors, (72208), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:35:08,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18374 states to 18374 states and 72208 transitions. [2021-05-22 01:35:08,115 INFO L78 Accepts]: Start accepts. Automaton has 18374 states and 72208 transitions. Word has length 15 [2021-05-22 01:35:08,115 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:35:08,115 INFO L482 AbstractCegarLoop]: Abstraction has 18374 states and 72208 transitions. [2021-05-22 01:35:08,115 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 17 states have (on average 1.6470588235294117) internal successors, (28), 17 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:35:08,115 INFO L276 IsEmpty]: Start isEmpty. Operand 18374 states and 72208 transitions. [2021-05-22 01:35:08,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-22 01:35:08,116 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:35:08,116 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:35:08,324 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51,46 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:35:08,324 INFO L430 AbstractCegarLoop]: === Iteration 7 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:35:08,325 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:35:08,325 INFO L82 PathProgramCache]: Analyzing trace with hash 210295032, now seen corresponding path program 1 times [2021-05-22 01:35:08,325 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:35:08,325 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1061138520] [2021-05-22 01:35:08,325 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:35:08,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:35:08,365 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-22 01:35:08,365 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:35:08,365 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1061138520] [2021-05-22 01:35:08,365 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1061138520] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:35:08,365 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1872403527] [2021-05-22 01:35:08,365 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:35:08,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:35:08,388 INFO L263 TraceCheckSpWp]: Trace formula consists of 28 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-22 01:35:08,389 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:35:08,480 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:35:08,480 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1872403527] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:35:08,480 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:35:08,480 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 15 [2021-05-22 01:35:08,480 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [229292279] [2021-05-22 01:35:08,481 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 01:35:08,481 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:35:08,481 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 01:35:08,481 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=219, Unknown=0, NotChecked=0, Total=272 [2021-05-22 01:35:08,481 INFO L87 Difference]: Start difference. First operand 18374 states and 72208 transitions. Second operand has 17 states, 16 states have (on average 1.75) internal successors, (28), 16 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:35:09,896 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:35:09,896 INFO L93 Difference]: Finished difference Result 86468 states and 311613 transitions. [2021-05-22 01:35:09,897 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-05-22 01:35:09,897 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 1.75) internal successors, (28), 16 states have internal predecessors, (28), 0 states have call successors, (0), 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 15 [2021-05-22 01:35:09,897 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:35:10,130 INFO L225 Difference]: With dead ends: 86468 [2021-05-22 01:35:10,130 INFO L226 Difference]: Without dead ends: 85466 [2021-05-22 01:35:10,130 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 696 ImplicationChecksByTransitivity, 446.3ms TimeCoverageRelationStatistics Valid=625, Invalid=2027, Unknown=0, NotChecked=0, Total=2652 [2021-05-22 01:35:10,740 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85466 states. [2021-05-22 01:35:11,453 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85466 to 19632. [2021-05-22 01:35:11,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19632 states, 19595 states have (on average 3.9771880581781067) internal successors, (77933), 19631 states have internal predecessors, (77933), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:35:11,525 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19632 states to 19632 states and 77933 transitions. [2021-05-22 01:35:11,525 INFO L78 Accepts]: Start accepts. Automaton has 19632 states and 77933 transitions. Word has length 15 [2021-05-22 01:35:11,525 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:35:11,525 INFO L482 AbstractCegarLoop]: Abstraction has 19632 states and 77933 transitions. [2021-05-22 01:35:11,525 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 16 states have (on average 1.75) internal successors, (28), 16 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:35:11,525 INFO L276 IsEmpty]: Start isEmpty. Operand 19632 states and 77933 transitions. [2021-05-22 01:35:11,526 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-22 01:35:11,526 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:35:11,526 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:35:11,727 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable52 [2021-05-22 01:35:11,727 INFO L430 AbstractCegarLoop]: === Iteration 8 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:35:11,727 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:35:11,727 INFO L82 PathProgramCache]: Analyzing trace with hash -1657134634, now seen corresponding path program 2 times [2021-05-22 01:35:11,727 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:35:11,727 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [838731821] [2021-05-22 01:35:11,727 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:35:11,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:35:11,767 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:35:11,768 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:35:11,768 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [838731821] [2021-05-22 01:35:11,768 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [838731821] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:35:11,768 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1221414696] [2021-05-22 01:35:11,768 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 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:35:11,787 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 01:35:11,787 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 01:35:11,787 INFO L263 TraceCheckSpWp]: Trace formula consists of 28 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-22 01:35:11,787 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:35:11,869 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-22 01:35:11,870 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1221414696] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:35:11,870 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:35:11,870 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 16 [2021-05-22 01:35:11,870 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [849251120] [2021-05-22 01:35:11,870 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 01:35:11,870 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:35:11,870 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 01:35:11,870 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=255, Unknown=0, NotChecked=0, Total=306 [2021-05-22 01:35:11,870 INFO L87 Difference]: Start difference. First operand 19632 states and 77933 transitions. Second operand has 18 states, 17 states have (on average 1.7058823529411764) 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) [2021-05-22 01:35:13,072 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:35:13,072 INFO L93 Difference]: Finished difference Result 66483 states and 242457 transitions. [2021-05-22 01:35:13,073 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-22 01:35:13,073 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 1.7058823529411764) 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) Word has length 15 [2021-05-22 01:35:13,073 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:35:13,247 INFO L225 Difference]: With dead ends: 66483 [2021-05-22 01:35:13,247 INFO L226 Difference]: Without dead ends: 64976 [2021-05-22 01:35:13,247 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 386 ImplicationChecksByTransitivity, 403.1ms TimeCoverageRelationStatistics Valid=513, Invalid=1467, Unknown=0, NotChecked=0, Total=1980 [2021-05-22 01:35:13,778 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64976 states. [2021-05-22 01:35:14,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64976 to 18426. [2021-05-22 01:35:14,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18426 states, 18389 states have (on average 3.90989178313122) internal successors, (71899), 18425 states have internal predecessors, (71899), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:35:14,388 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18426 states to 18426 states and 71899 transitions. [2021-05-22 01:35:14,388 INFO L78 Accepts]: Start accepts. Automaton has 18426 states and 71899 transitions. Word has length 15 [2021-05-22 01:35:14,389 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:35:14,389 INFO L482 AbstractCegarLoop]: Abstraction has 18426 states and 71899 transitions. [2021-05-22 01:35:14,389 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 17 states have (on average 1.7058823529411764) 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) [2021-05-22 01:35:14,389 INFO L276 IsEmpty]: Start isEmpty. Operand 18426 states and 71899 transitions. [2021-05-22 01:35:14,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-22 01:35:14,390 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:35:14,390 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:35:14,596 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53,48 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:35:14,596 INFO L430 AbstractCegarLoop]: === Iteration 9 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:35:14,597 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:35:14,597 INFO L82 PathProgramCache]: Analyzing trace with hash -1657139604, now seen corresponding path program 2 times [2021-05-22 01:35:14,597 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:35:14,597 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [611892582] [2021-05-22 01:35:14,597 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:35:14,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:35:14,641 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:35:14,641 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:35:14,641 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [611892582] [2021-05-22 01:35:14,641 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [611892582] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:35:14,641 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1448462392] [2021-05-22 01:35:14,642 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 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:35:14,662 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 01:35:14,662 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 01:35:14,663 INFO L263 TraceCheckSpWp]: Trace formula consists of 28 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-22 01:35:14,663 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:35:14,760 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-22 01:35:14,760 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1448462392] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:35:14,760 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:35:14,760 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 16 [2021-05-22 01:35:14,760 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [452140802] [2021-05-22 01:35:14,760 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 01:35:14,760 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:35:14,761 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 01:35:14,761 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=255, Unknown=0, NotChecked=0, Total=306 [2021-05-22 01:35:14,761 INFO L87 Difference]: Start difference. First operand 18426 states and 71899 transitions. Second operand has 18 states, 17 states have (on average 1.7058823529411764) 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) [2021-05-22 01:35:15,993 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:35:15,993 INFO L93 Difference]: Finished difference Result 68276 states and 248910 transitions. [2021-05-22 01:35:15,994 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-22 01:35:15,994 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 1.7058823529411764) 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) Word has length 15 [2021-05-22 01:35:15,994 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:35:16,166 INFO L225 Difference]: With dead ends: 68276 [2021-05-22 01:35:16,166 INFO L226 Difference]: Without dead ends: 66663 [2021-05-22 01:35:16,167 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 391 ImplicationChecksByTransitivity, 426.8ms TimeCoverageRelationStatistics Valid=513, Invalid=1467, Unknown=0, NotChecked=0, Total=1980 [2021-05-22 01:35:16,652 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66663 states. [2021-05-22 01:35:17,265 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66663 to 17236. [2021-05-22 01:35:17,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17236 states, 17199 states have (on average 3.856154427582999) internal successors, (66322), 17235 states have internal predecessors, (66322), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:35:17,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17236 states to 17236 states and 66322 transitions. [2021-05-22 01:35:17,325 INFO L78 Accepts]: Start accepts. Automaton has 17236 states and 66322 transitions. Word has length 15 [2021-05-22 01:35:17,325 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:35:17,325 INFO L482 AbstractCegarLoop]: Abstraction has 17236 states and 66322 transitions. [2021-05-22 01:35:17,325 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 17 states have (on average 1.7058823529411764) 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) [2021-05-22 01:35:17,325 INFO L276 IsEmpty]: Start isEmpty. Operand 17236 states and 66322 transitions. [2021-05-22 01:35:17,327 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-05-22 01:35:17,327 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:35:17,327 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:35:17,548 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable54 [2021-05-22 01:35:17,548 INFO L430 AbstractCegarLoop]: === Iteration 10 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:35:17,549 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:35:17,549 INFO L82 PathProgramCache]: Analyzing trace with hash -70336879, now seen corresponding path program 1 times [2021-05-22 01:35:17,549 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:35:17,549 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2059304526] [2021-05-22 01:35:17,549 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:35:17,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:35:17,568 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-22 01:35:17,569 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:35:17,569 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2059304526] [2021-05-22 01:35:17,569 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2059304526] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:35:17,569 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1900310617] [2021-05-22 01:35:17,569 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:35:17,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:35:17,589 INFO L263 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-22 01:35:17,589 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:35:17,677 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 12 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:35:17,677 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1900310617] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:35:17,677 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:35:17,677 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 8] total 12 [2021-05-22 01:35:17,677 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1740269984] [2021-05-22 01:35:17,677 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 01:35:17,677 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:35:17,678 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 01:35:17,678 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=136, Unknown=0, NotChecked=0, Total=182 [2021-05-22 01:35:17,678 INFO L87 Difference]: Start difference. First operand 17236 states and 66322 transitions. Second operand has 14 states, 13 states have (on average 2.076923076923077) internal successors, (27), 13 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:35:18,192 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:35:18,193 INFO L93 Difference]: Finished difference Result 49321 states and 176968 transitions. [2021-05-22 01:35:18,193 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-22 01:35:18,193 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 2.076923076923077) internal successors, (27), 13 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2021-05-22 01:35:18,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:35:18,306 INFO L225 Difference]: With dead ends: 49321 [2021-05-22 01:35:18,306 INFO L226 Difference]: Without dead ends: 47946 [2021-05-22 01:35:18,306 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 126 ImplicationChecksByTransitivity, 159.3ms TimeCoverageRelationStatistics Valid=198, Invalid=504, Unknown=0, NotChecked=0, Total=702 [2021-05-22 01:35:18,710 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47946 states. [2021-05-22 01:35:19,118 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47946 to 17908. [2021-05-22 01:35:19,140 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17908 states, 17871 states have (on average 3.8434894521851044) internal successors, (68687), 17907 states have internal predecessors, (68687), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:35:19,190 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17908 states to 17908 states and 68687 transitions. [2021-05-22 01:35:19,191 INFO L78 Accepts]: Start accepts. Automaton has 17908 states and 68687 transitions. Word has length 16 [2021-05-22 01:35:19,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:35:19,191 INFO L482 AbstractCegarLoop]: Abstraction has 17908 states and 68687 transitions. [2021-05-22 01:35:19,191 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 13 states have (on average 2.076923076923077) internal successors, (27), 13 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:35:19,191 INFO L276 IsEmpty]: Start isEmpty. Operand 17908 states and 68687 transitions. [2021-05-22 01:35:19,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-22 01:35:19,192 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:35:19,192 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:35:19,393 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable55 [2021-05-22 01:35:19,393 INFO L430 AbstractCegarLoop]: === Iteration 11 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:35:19,393 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:35:19,393 INFO L82 PathProgramCache]: Analyzing trace with hash -349315241, now seen corresponding path program 1 times [2021-05-22 01:35:19,393 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:35:19,394 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [546709482] [2021-05-22 01:35:19,394 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:35:19,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:35:19,436 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-05-22 01:35:19,436 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:35:19,436 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [546709482] [2021-05-22 01:35:19,436 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [546709482] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:35:19,436 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1453973292] [2021-05-22 01:35:19,436 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:35:19,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:35:19,457 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-22 01:35:19,457 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:35:19,583 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:35:19,583 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1453973292] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:35:19,583 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:35:19,583 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 18 [2021-05-22 01:35:19,583 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [761564000] [2021-05-22 01:35:19,583 INFO L462 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-22 01:35:19,584 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:35:19,584 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-22 01:35:19,584 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=315, Unknown=0, NotChecked=0, Total=380 [2021-05-22 01:35:19,584 INFO L87 Difference]: Start difference. First operand 17908 states and 68687 transitions. Second operand has 20 states, 19 states have (on average 1.631578947368421) internal successors, (31), 19 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:35:22,576 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 14 [2021-05-22 01:35:25,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:35:25,281 INFO L93 Difference]: Finished difference Result 228056 states and 752581 transitions. [2021-05-22 01:35:25,281 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 202 states. [2021-05-22 01:35:25,281 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 1.631578947368421) internal successors, (31), 19 states have internal predecessors, (31), 0 states have call successors, (0), 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 17 [2021-05-22 01:35:25,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:35:26,401 INFO L225 Difference]: With dead ends: 228056 [2021-05-22 01:35:26,401 INFO L226 Difference]: Without dead ends: 224200 [2021-05-22 01:35:26,403 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 223 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 214 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21581 ImplicationChecksByTransitivity, 3238.1ms TimeCoverageRelationStatistics Valid=7452, Invalid=38988, Unknown=0, NotChecked=0, Total=46440 [2021-05-22 01:35:27,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 224200 states. [2021-05-22 01:35:29,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 224200 to 19966. [2021-05-22 01:35:29,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19966 states, 19929 states have (on average 3.9042601234382057) internal successors, (77808), 19965 states have internal predecessors, (77808), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:35:29,525 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19966 states to 19966 states and 77808 transitions. [2021-05-22 01:35:29,526 INFO L78 Accepts]: Start accepts. Automaton has 19966 states and 77808 transitions. Word has length 17 [2021-05-22 01:35:29,526 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:35:29,526 INFO L482 AbstractCegarLoop]: Abstraction has 19966 states and 77808 transitions. [2021-05-22 01:35:29,526 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 20 states, 19 states have (on average 1.631578947368421) internal successors, (31), 19 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:35:29,526 INFO L276 IsEmpty]: Start isEmpty. Operand 19966 states and 77808 transitions. [2021-05-22 01:35:29,527 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-22 01:35:29,527 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:35:29,527 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:35:29,728 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56,51 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:35:29,728 INFO L430 AbstractCegarLoop]: === Iteration 12 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:35:29,728 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:35:29,728 INFO L82 PathProgramCache]: Analyzing trace with hash 2078222389, now seen corresponding path program 2 times [2021-05-22 01:35:29,728 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:35:29,728 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2100690863] [2021-05-22 01:35:29,728 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:35:29,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:35:29,782 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-22 01:35:29,782 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:35:29,782 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2100690863] [2021-05-22 01:35:29,782 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2100690863] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:35:29,782 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1573768324] [2021-05-22 01:35:29,782 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 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:35:29,801 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 01:35:29,801 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 01:35:29,802 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-22 01:35:29,802 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:35:29,963 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:35:29,963 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1573768324] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:35:29,963 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:35:29,963 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11] total 20 [2021-05-22 01:35:29,963 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [108285019] [2021-05-22 01:35:29,964 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-22 01:35:29,964 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:35:29,964 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-22 01:35:29,964 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=386, Unknown=0, NotChecked=0, Total=462 [2021-05-22 01:35:29,964 INFO L87 Difference]: Start difference. First operand 19966 states and 77808 transitions. Second operand has 22 states, 21 states have (on average 1.5238095238095237) internal successors, (32), 21 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) [2021-05-22 01:35:36,797 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:35:36,797 INFO L93 Difference]: Finished difference Result 244159 states and 816615 transitions. [2021-05-22 01:35:36,797 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 231 states. [2021-05-22 01:35:36,798 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 1.5238095238095237) internal successors, (32), 21 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) Word has length 17 [2021-05-22 01:35:36,798 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:35:37,891 INFO L225 Difference]: With dead ends: 244159 [2021-05-22 01:35:37,891 INFO L226 Difference]: Without dead ends: 239586 [2021-05-22 01:35:37,894 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 253 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 246 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28048 ImplicationChecksByTransitivity, 3881.4ms TimeCoverageRelationStatistics Valid=9716, Invalid=51540, Unknown=0, NotChecked=0, Total=61256 [2021-05-22 01:35:38,968 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 239586 states. [2021-05-22 01:35:40,706 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 239586 to 19782. [2021-05-22 01:35:40,731 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19782 states, 19745 states have (on average 3.8888832615852116) internal successors, (76786), 19781 states have internal predecessors, (76786), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:35:40,784 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19782 states to 19782 states and 76786 transitions. [2021-05-22 01:35:40,784 INFO L78 Accepts]: Start accepts. Automaton has 19782 states and 76786 transitions. Word has length 17 [2021-05-22 01:35:40,784 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:35:40,784 INFO L482 AbstractCegarLoop]: Abstraction has 19782 states and 76786 transitions. [2021-05-22 01:35:40,784 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 21 states have (on average 1.5238095238095237) internal successors, (32), 21 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) [2021-05-22 01:35:40,784 INFO L276 IsEmpty]: Start isEmpty. Operand 19782 states and 76786 transitions. [2021-05-22 01:35:40,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-22 01:35:40,786 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:35:40,786 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:35:40,986 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable57 [2021-05-22 01:35:40,986 INFO L430 AbstractCegarLoop]: === Iteration 13 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:35:40,986 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:35:40,987 INFO L82 PathProgramCache]: Analyzing trace with hash 1830826041, now seen corresponding path program 3 times [2021-05-22 01:35:40,987 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:35:40,987 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [243709438] [2021-05-22 01:35:40,987 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:35:40,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:35:41,030 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-22 01:35:41,030 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:35:41,030 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [243709438] [2021-05-22 01:35:41,030 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [243709438] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:35:41,030 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2096611350] [2021-05-22 01:35:41,030 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 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:35:41,049 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 01:35:41,050 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 01:35:41,050 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-22 01:35:41,050 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:35:41,425 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:35:41,425 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2096611350] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:35:41,425 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:35:41,425 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 19 [2021-05-22 01:35:41,425 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1432771612] [2021-05-22 01:35:41,425 INFO L462 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-22 01:35:41,425 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:35:41,425 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-22 01:35:41,425 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=348, Unknown=0, NotChecked=0, Total=420 [2021-05-22 01:35:41,426 INFO L87 Difference]: Start difference. First operand 19782 states and 76786 transitions. Second operand has 21 states, 20 states have (on average 1.65) internal successors, (33), 20 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:35:49,049 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:35:49,050 INFO L93 Difference]: Finished difference Result 278250 states and 927185 transitions. [2021-05-22 01:35:49,050 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 248 states. [2021-05-22 01:35:49,050 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 1.65) internal successors, (33), 20 states have internal predecessors, (33), 0 states have call successors, (0), 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 17 [2021-05-22 01:35:49,050 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:35:50,349 INFO L225 Difference]: With dead ends: 278250 [2021-05-22 01:35:50,349 INFO L226 Difference]: Without dead ends: 276089 [2021-05-22 01:35:50,352 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 269 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 261 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30298 ImplicationChecksByTransitivity, 3890.7ms TimeCoverageRelationStatistics Valid=10197, Invalid=58709, Unknown=0, NotChecked=0, Total=68906 [2021-05-22 01:35:51,650 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 276089 states. [2021-05-22 01:35:53,804 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 276089 to 19261. [2021-05-22 01:35:53,828 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19261 states, 19224 states have (on average 3.890813566375364) internal successors, (74797), 19260 states have internal predecessors, (74797), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:35:53,876 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19261 states to 19261 states and 74797 transitions. [2021-05-22 01:35:53,876 INFO L78 Accepts]: Start accepts. Automaton has 19261 states and 74797 transitions. Word has length 17 [2021-05-22 01:35:53,876 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:35:53,876 INFO L482 AbstractCegarLoop]: Abstraction has 19261 states and 74797 transitions. [2021-05-22 01:35:53,877 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 21 states, 20 states have (on average 1.65) internal successors, (33), 20 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:35:53,877 INFO L276 IsEmpty]: Start isEmpty. Operand 19261 states and 74797 transitions. [2021-05-22 01:35:53,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-22 01:35:53,878 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:35:53,878 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:35:54,078 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable58 [2021-05-22 01:35:54,079 INFO L430 AbstractCegarLoop]: === Iteration 14 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:35:54,079 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:35:54,079 INFO L82 PathProgramCache]: Analyzing trace with hash 230059607, now seen corresponding path program 4 times [2021-05-22 01:35:54,079 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:35:54,079 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [484180011] [2021-05-22 01:35:54,079 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:35:54,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:35:54,124 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-22 01:35:54,124 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:35:54,124 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [484180011] [2021-05-22 01:35:54,125 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [484180011] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:35:54,125 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2087387611] [2021-05-22 01:35:54,125 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 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:35:54,145 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 01:35:54,145 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 01:35:54,145 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-22 01:35:54,146 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:35:54,268 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:35:54,268 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2087387611] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:35:54,268 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:35:54,268 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 19 [2021-05-22 01:35:54,269 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2084064352] [2021-05-22 01:35:54,269 INFO L462 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-22 01:35:54,269 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:35:54,269 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-22 01:35:54,269 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=351, Unknown=0, NotChecked=0, Total=420 [2021-05-22 01:35:54,269 INFO L87 Difference]: Start difference. First operand 19261 states and 74797 transitions. Second operand has 21 states, 20 states have (on average 1.6) internal successors, (32), 20 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) [2021-05-22 01:35:58,988 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:35:58,988 INFO L93 Difference]: Finished difference Result 200419 states and 671992 transitions. [2021-05-22 01:35:58,988 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 151 states. [2021-05-22 01:35:58,988 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 1.6) internal successors, (32), 20 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) Word has length 17 [2021-05-22 01:35:58,988 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:35:59,493 INFO L225 Difference]: With dead ends: 200419 [2021-05-22 01:35:59,493 INFO L226 Difference]: Without dead ends: 196653 [2021-05-22 01:35:59,494 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 165 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11535 ImplicationChecksByTransitivity, 2325.9ms TimeCoverageRelationStatistics Valid=4766, Invalid=22956, Unknown=0, NotChecked=0, Total=27722 [2021-05-22 01:36:00,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196653 states. [2021-05-22 01:36:02,091 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196653 to 19057. [2021-05-22 01:36:02,112 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19057 states, 19020 states have (on average 3.880441640378549) internal successors, (73806), 19056 states have internal predecessors, (73806), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:36:02,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19057 states to 19057 states and 73806 transitions. [2021-05-22 01:36:02,161 INFO L78 Accepts]: Start accepts. Automaton has 19057 states and 73806 transitions. Word has length 17 [2021-05-22 01:36:02,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:36:02,161 INFO L482 AbstractCegarLoop]: Abstraction has 19057 states and 73806 transitions. [2021-05-22 01:36:02,161 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 21 states, 20 states have (on average 1.6) internal successors, (32), 20 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) [2021-05-22 01:36:02,161 INFO L276 IsEmpty]: Start isEmpty. Operand 19057 states and 73806 transitions. [2021-05-22 01:36:02,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-22 01:36:02,162 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:36:02,162 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:36:02,363 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable59 [2021-05-22 01:36:02,363 INFO L430 AbstractCegarLoop]: === Iteration 15 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:36:02,363 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:36:02,363 INFO L82 PathProgramCache]: Analyzing trace with hash 926480309, now seen corresponding path program 5 times [2021-05-22 01:36:02,363 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:36:02,363 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [458784543] [2021-05-22 01:36:02,363 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:36:02,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:36:02,425 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:36:02,425 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:36:02,425 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [458784543] [2021-05-22 01:36:02,425 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [458784543] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:36:02,425 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1838316791] [2021-05-22 01:36:02,425 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 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:36:02,444 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 01:36:02,444 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 01:36:02,444 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-22 01:36:02,445 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:36:02,583 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:36:02,583 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1838316791] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:36:02,583 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:36:02,584 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 21 [2021-05-22 01:36:02,584 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [953746986] [2021-05-22 01:36:02,584 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-22 01:36:02,584 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:36:02,584 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-22 01:36:02,584 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=423, Unknown=0, NotChecked=0, Total=506 [2021-05-22 01:36:02,584 INFO L87 Difference]: Start difference. First operand 19057 states and 73806 transitions. Second operand has 23 states, 22 states have (on average 1.5) internal successors, (33), 22 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:36:09,232 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:36:09,232 INFO L93 Difference]: Finished difference Result 228776 states and 761708 transitions. [2021-05-22 01:36:09,244 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 205 states. [2021-05-22 01:36:09,245 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 22 states have (on average 1.5) internal successors, (33), 22 states have internal predecessors, (33), 0 states have call successors, (0), 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 17 [2021-05-22 01:36:09,245 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:36:09,912 INFO L225 Difference]: With dead ends: 228776 [2021-05-22 01:36:09,912 INFO L226 Difference]: Without dead ends: 227342 [2021-05-22 01:36:09,914 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 228 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 222 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21981 ImplicationChecksByTransitivity, 2903.0ms TimeCoverageRelationStatistics Valid=8603, Invalid=41349, Unknown=0, NotChecked=0, Total=49952 [2021-05-22 01:36:11,130 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 227342 states. [2021-05-22 01:36:12,750 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 227342 to 17668. [2021-05-22 01:36:12,770 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17668 states, 17631 states have (on average 3.8456695592989623) internal successors, (67803), 17667 states have internal predecessors, (67803), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:36:12,814 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17668 states to 17668 states and 67803 transitions. [2021-05-22 01:36:12,814 INFO L78 Accepts]: Start accepts. Automaton has 17668 states and 67803 transitions. Word has length 17 [2021-05-22 01:36:12,814 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:36:12,814 INFO L482 AbstractCegarLoop]: Abstraction has 17668 states and 67803 transitions. [2021-05-22 01:36:12,814 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 22 states have (on average 1.5) internal successors, (33), 22 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:36:12,814 INFO L276 IsEmpty]: Start isEmpty. Operand 17668 states and 67803 transitions. [2021-05-22 01:36:12,816 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-22 01:36:12,816 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:36:12,816 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:36:13,016 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable60,55 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:36:13,017 INFO L430 AbstractCegarLoop]: === Iteration 16 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:36:13,017 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:36:13,017 INFO L82 PathProgramCache]: Analyzing trace with hash 921718709, now seen corresponding path program 6 times [2021-05-22 01:36:13,017 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:36:13,017 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [554902072] [2021-05-22 01:36:13,017 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:36:13,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:36:13,099 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:36:13,099 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:36:13,099 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [554902072] [2021-05-22 01:36:13,099 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [554902072] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:36:13,099 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [601148619] [2021-05-22 01:36:13,099 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 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:36:13,125 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 01:36:13,125 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 01:36:13,125 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-22 01:36:13,126 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:36:13,261 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:36:13,262 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [601148619] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:36:13,262 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:36:13,262 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 21 [2021-05-22 01:36:13,262 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2023561419] [2021-05-22 01:36:13,262 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-22 01:36:13,262 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:36:13,262 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-22 01:36:13,262 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=423, Unknown=0, NotChecked=0, Total=506 [2021-05-22 01:36:13,262 INFO L87 Difference]: Start difference. First operand 17668 states and 67803 transitions. Second operand has 23 states, 22 states have (on average 1.5) internal successors, (33), 22 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:36:19,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:36:19,937 INFO L93 Difference]: Finished difference Result 249619 states and 836495 transitions. [2021-05-22 01:36:19,938 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 203 states. [2021-05-22 01:36:19,938 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 22 states have (on average 1.5) internal successors, (33), 22 states have internal predecessors, (33), 0 states have call successors, (0), 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 17 [2021-05-22 01:36:19,938 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:36:21,194 INFO L225 Difference]: With dead ends: 249619 [2021-05-22 01:36:21,195 INFO L226 Difference]: Without dead ends: 246009 [2021-05-22 01:36:21,196 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 226 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 220 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20868 ImplicationChecksByTransitivity, 3221.1ms TimeCoverageRelationStatistics Valid=8539, Invalid=40523, Unknown=0, NotChecked=0, Total=49062 [2021-05-22 01:36:22,331 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 246009 states. [2021-05-22 01:36:23,944 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 246009 to 15661. [2021-05-22 01:36:23,964 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15661 states, 15631 states have (on average 3.8620049900838076) internal successors, (60367), 15660 states have internal predecessors, (60367), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:36:24,007 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15661 states to 15661 states and 60367 transitions. [2021-05-22 01:36:24,007 INFO L78 Accepts]: Start accepts. Automaton has 15661 states and 60367 transitions. Word has length 17 [2021-05-22 01:36:24,007 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:36:24,007 INFO L482 AbstractCegarLoop]: Abstraction has 15661 states and 60367 transitions. [2021-05-22 01:36:24,007 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 22 states have (on average 1.5) internal successors, (33), 22 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:36:24,007 INFO L276 IsEmpty]: Start isEmpty. Operand 15661 states and 60367 transitions. [2021-05-22 01:36:24,009 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-22 01:36:24,009 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:36:24,009 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:36:24,209 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable61,56 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:36:24,210 INFO L430 AbstractCegarLoop]: === Iteration 17 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:36:24,210 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:36:24,210 INFO L82 PathProgramCache]: Analyzing trace with hash -238386158, now seen corresponding path program 1 times [2021-05-22 01:36:24,210 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:36:24,210 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [129505330] [2021-05-22 01:36:24,210 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:36:24,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:36:24,256 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 10 proven. 3 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-22 01:36:24,257 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:36:24,257 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [129505330] [2021-05-22 01:36:24,257 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [129505330] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:36:24,257 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1066966620] [2021-05-22 01:36:24,257 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:36:24,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:36:24,277 INFO L263 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-22 01:36:24,277 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:36:24,386 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:36:24,386 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1066966620] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:36:24,386 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:36:24,387 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10] total 18 [2021-05-22 01:36:24,387 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1127176153] [2021-05-22 01:36:24,387 INFO L462 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-22 01:36:24,387 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:36:24,387 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-22 01:36:24,387 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=305, Unknown=0, NotChecked=0, Total=380 [2021-05-22 01:36:24,387 INFO L87 Difference]: Start difference. First operand 15661 states and 60367 transitions. Second operand has 20 states, 19 states have (on average 1.7894736842105263) internal successors, (34), 19 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:36:25,948 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:36:25,948 INFO L93 Difference]: Finished difference Result 69283 states and 251093 transitions. [2021-05-22 01:36:25,948 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-05-22 01:36:25,948 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 1.7894736842105263) internal successors, (34), 19 states have internal predecessors, (34), 0 states have call successors, (0), 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 18 [2021-05-22 01:36:25,948 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:36:26,135 INFO L225 Difference]: With dead ends: 69283 [2021-05-22 01:36:26,135 INFO L226 Difference]: Without dead ends: 68431 [2021-05-22 01:36:26,135 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1058 ImplicationChecksByTransitivity, 600.3ms TimeCoverageRelationStatistics Valid=895, Invalid=3011, Unknown=0, NotChecked=0, Total=3906 [2021-05-22 01:36:26,372 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68431 states. [2021-05-22 01:36:27,171 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68431 to 15474. [2021-05-22 01:36:27,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15474 states, 15444 states have (on average 3.8453768453768453) internal successors, (59388), 15473 states have internal predecessors, (59388), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:36:27,234 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15474 states to 15474 states and 59388 transitions. [2021-05-22 01:36:27,235 INFO L78 Accepts]: Start accepts. Automaton has 15474 states and 59388 transitions. Word has length 18 [2021-05-22 01:36:27,235 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:36:27,235 INFO L482 AbstractCegarLoop]: Abstraction has 15474 states and 59388 transitions. [2021-05-22 01:36:27,235 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 20 states, 19 states have (on average 1.7894736842105263) internal successors, (34), 19 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:36:27,235 INFO L276 IsEmpty]: Start isEmpty. Operand 15474 states and 59388 transitions. [2021-05-22 01:36:27,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-22 01:36:27,238 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:36:27,238 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:36:27,440 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable62,57 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:36:27,441 INFO L430 AbstractCegarLoop]: === Iteration 18 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:36:27,441 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:36:27,441 INFO L82 PathProgramCache]: Analyzing trace with hash -1696703797, now seen corresponding path program 1 times [2021-05-22 01:36:27,442 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:36:27,442 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1428387025] [2021-05-22 01:36:27,442 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:36:27,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:36:27,499 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 9 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-22 01:36:27,499 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:36:27,499 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1428387025] [2021-05-22 01:36:27,499 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1428387025] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:36:27,499 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [584496058] [2021-05-22 01:36:27,499 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:36:27,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:36:27,522 INFO L263 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-22 01:36:27,522 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:36:27,638 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 4 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:36:27,638 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [584496058] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:36:27,638 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:36:27,638 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 10] total 17 [2021-05-22 01:36:27,638 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1696137414] [2021-05-22 01:36:27,638 INFO L462 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-22 01:36:27,638 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:36:27,638 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-22 01:36:27,639 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=277, Unknown=0, NotChecked=0, Total=342 [2021-05-22 01:36:27,639 INFO L87 Difference]: Start difference. First operand 15474 states and 59388 transitions. Second operand has 19 states, 18 states have (on average 1.8333333333333333) internal successors, (33), 18 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:36:29,187 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:36:29,188 INFO L93 Difference]: Finished difference Result 67183 states and 242227 transitions. [2021-05-22 01:36:29,188 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-05-22 01:36:29,188 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 1.8333333333333333) internal successors, (33), 18 states have internal predecessors, (33), 0 states have call successors, (0), 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 18 [2021-05-22 01:36:29,188 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:36:29,367 INFO L225 Difference]: With dead ends: 67183 [2021-05-22 01:36:29,368 INFO L226 Difference]: Without dead ends: 65938 [2021-05-22 01:36:29,368 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 868 ImplicationChecksByTransitivity, 545.3ms TimeCoverageRelationStatistics Valid=773, Invalid=2533, Unknown=0, NotChecked=0, Total=3306 [2021-05-22 01:36:29,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65938 states. [2021-05-22 01:36:30,065 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65938 to 16194. [2021-05-22 01:36:30,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16194 states, 16164 states have (on average 3.8561618411284337) internal successors, (62331), 16193 states have internal predecessors, (62331), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:36:30,404 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16194 states to 16194 states and 62331 transitions. [2021-05-22 01:36:30,404 INFO L78 Accepts]: Start accepts. Automaton has 16194 states and 62331 transitions. Word has length 18 [2021-05-22 01:36:30,404 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:36:30,404 INFO L482 AbstractCegarLoop]: Abstraction has 16194 states and 62331 transitions. [2021-05-22 01:36:30,405 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 19 states, 18 states have (on average 1.8333333333333333) internal successors, (33), 18 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:36:30,405 INFO L276 IsEmpty]: Start isEmpty. Operand 16194 states and 62331 transitions. [2021-05-22 01:36:30,408 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-22 01:36:30,408 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:36:30,416 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:36:30,632 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable63,58 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:36:30,633 INFO L430 AbstractCegarLoop]: === Iteration 19 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:36:30,633 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:36:30,633 INFO L82 PathProgramCache]: Analyzing trace with hash -1878025230, now seen corresponding path program 1 times [2021-05-22 01:36:30,633 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:36:30,633 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1917910768] [2021-05-22 01:36:30,633 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:36:30,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:36:30,671 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 10 proven. 3 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-22 01:36:30,671 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:36:30,671 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1917910768] [2021-05-22 01:36:30,671 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1917910768] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:36:30,671 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [986836509] [2021-05-22 01:36:30,671 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 59 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 59 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:36:30,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:36:30,690 INFO L263 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-22 01:36:30,691 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:36:30,801 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:36:30,801 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [986836509] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:36:30,801 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:36:30,801 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 10] total 17 [2021-05-22 01:36:30,801 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1519437901] [2021-05-22 01:36:30,801 INFO L462 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-22 01:36:30,801 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:36:30,802 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-22 01:36:30,802 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2021-05-22 01:36:30,802 INFO L87 Difference]: Start difference. First operand 16194 states and 62331 transitions. Second operand has 19 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:36:31,946 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:36:31,947 INFO L93 Difference]: Finished difference Result 64746 states and 234169 transitions. [2021-05-22 01:36:31,947 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-05-22 01:36:31,947 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 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 18 [2021-05-22 01:36:31,947 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:36:32,114 INFO L225 Difference]: With dead ends: 64746 [2021-05-22 01:36:32,114 INFO L226 Difference]: Without dead ends: 63051 [2021-05-22 01:36:32,115 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 633 ImplicationChecksByTransitivity, 435.3ms TimeCoverageRelationStatistics Valid=620, Invalid=1930, Unknown=0, NotChecked=0, Total=2550 [2021-05-22 01:36:32,580 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63051 states. [2021-05-22 01:36:32,981 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63051 to 17049. [2021-05-22 01:36:33,002 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17049 states, 17019 states have (on average 3.8841295023209352) internal successors, (66104), 17048 states have internal predecessors, (66104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:36:33,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17049 states to 17049 states and 66104 transitions. [2021-05-22 01:36:33,048 INFO L78 Accepts]: Start accepts. Automaton has 17049 states and 66104 transitions. Word has length 18 [2021-05-22 01:36:33,048 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:36:33,048 INFO L482 AbstractCegarLoop]: Abstraction has 17049 states and 66104 transitions. [2021-05-22 01:36:33,048 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 19 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:36:33,048 INFO L276 IsEmpty]: Start isEmpty. Operand 17049 states and 66104 transitions. [2021-05-22 01:36:33,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-22 01:36:33,051 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:36:33,051 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:36:33,252 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 59 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable64 [2021-05-22 01:36:33,252 INFO L430 AbstractCegarLoop]: === Iteration 20 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:36:33,252 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:36:33,252 INFO L82 PathProgramCache]: Analyzing trace with hash 1125732939, now seen corresponding path program 2 times [2021-05-22 01:36:33,252 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:36:33,253 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [16586507] [2021-05-22 01:36:33,253 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:36:33,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:36:33,326 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 12 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:36:33,326 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:36:33,326 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [16586507] [2021-05-22 01:36:33,326 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [16586507] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:36:33,326 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1822047615] [2021-05-22 01:36:33,326 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 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:36:33,346 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 01:36:33,346 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 01:36:33,346 INFO L263 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-22 01:36:33,347 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:36:33,440 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 1 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-05-22 01:36:33,440 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1822047615] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:36:33,440 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:36:33,440 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8] total 17 [2021-05-22 01:36:33,440 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1422360512] [2021-05-22 01:36:33,441 INFO L462 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-22 01:36:33,441 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:36:33,441 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-22 01:36:33,441 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=288, Unknown=0, NotChecked=0, Total=342 [2021-05-22 01:36:33,441 INFO L87 Difference]: Start difference. First operand 17049 states and 66104 transitions. Second operand has 19 states, 18 states have (on average 1.8333333333333333) internal successors, (33), 18 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:36:35,169 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:36:35,169 INFO L93 Difference]: Finished difference Result 76150 states and 277397 transitions. [2021-05-22 01:36:35,170 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-05-22 01:36:35,170 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 1.8333333333333333) internal successors, (33), 18 states have internal predecessors, (33), 0 states have call successors, (0), 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 18 [2021-05-22 01:36:35,170 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:36:35,372 INFO L225 Difference]: With dead ends: 76150 [2021-05-22 01:36:35,372 INFO L226 Difference]: Without dead ends: 74224 [2021-05-22 01:36:35,372 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 840 ImplicationChecksByTransitivity, 618.6ms TimeCoverageRelationStatistics Valid=864, Invalid=2676, Unknown=0, NotChecked=0, Total=3540 [2021-05-22 01:36:35,851 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74224 states. [2021-05-22 01:36:36,302 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74224 to 15872. [2021-05-22 01:36:36,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15872 states, 15842 states have (on average 3.849387703572781) internal successors, (60982), 15871 states have internal predecessors, (60982), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:36:36,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15872 states to 15872 states and 60982 transitions. [2021-05-22 01:36:36,360 INFO L78 Accepts]: Start accepts. Automaton has 15872 states and 60982 transitions. Word has length 18 [2021-05-22 01:36:36,360 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:36:36,360 INFO L482 AbstractCegarLoop]: Abstraction has 15872 states and 60982 transitions. [2021-05-22 01:36:36,360 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 19 states, 18 states have (on average 1.8333333333333333) internal successors, (33), 18 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:36:36,360 INFO L276 IsEmpty]: Start isEmpty. Operand 15872 states and 60982 transitions. [2021-05-22 01:36:36,363 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-22 01:36:36,363 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:36:36,363 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:36:36,563 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable65,60 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:36:36,563 INFO L430 AbstractCegarLoop]: === Iteration 21 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:36:36,563 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:36:36,564 INFO L82 PathProgramCache]: Analyzing trace with hash 1125723024, now seen corresponding path program 2 times [2021-05-22 01:36:36,564 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:36:36,564 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2109627] [2021-05-22 01:36:36,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:36:36,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:36:36,620 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 12 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:36:36,620 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:36:36,620 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2109627] [2021-05-22 01:36:36,620 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2109627] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:36:36,620 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1077645243] [2021-05-22 01:36:36,620 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 61 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 61 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:36:36,640 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 01:36:36,640 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 01:36:36,640 INFO L263 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-22 01:36:36,641 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:36:36,733 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 1 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-05-22 01:36:36,734 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1077645243] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:36:36,734 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:36:36,734 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8] total 17 [2021-05-22 01:36:36,734 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [977593314] [2021-05-22 01:36:36,734 INFO L462 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-22 01:36:36,734 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:36:36,734 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-22 01:36:36,735 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=288, Unknown=0, NotChecked=0, Total=342 [2021-05-22 01:36:36,735 INFO L87 Difference]: Start difference. First operand 15872 states and 60982 transitions. Second operand has 19 states, 18 states have (on average 1.8333333333333333) internal successors, (33), 18 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:36:37,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:36:37,949 INFO L93 Difference]: Finished difference Result 46458 states and 169742 transitions. [2021-05-22 01:36:37,949 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-22 01:36:37,949 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 1.8333333333333333) internal successors, (33), 18 states have internal predecessors, (33), 0 states have call successors, (0), 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 18 [2021-05-22 01:36:37,950 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:36:38,064 INFO L225 Difference]: With dead ends: 46458 [2021-05-22 01:36:38,064 INFO L226 Difference]: Without dead ends: 44556 [2021-05-22 01:36:38,065 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 359 ImplicationChecksByTransitivity, 403.9ms TimeCoverageRelationStatistics Valid=483, Invalid=1409, Unknown=0, NotChecked=0, Total=1892 [2021-05-22 01:36:38,233 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44556 states. [2021-05-22 01:36:38,587 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44556 to 14808. [2021-05-22 01:36:38,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14808 states, 14778 states have (on average 3.7911084043848966) internal successors, (56025), 14807 states have internal predecessors, (56025), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:36:38,641 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14808 states to 14808 states and 56025 transitions. [2021-05-22 01:36:38,641 INFO L78 Accepts]: Start accepts. Automaton has 14808 states and 56025 transitions. Word has length 18 [2021-05-22 01:36:38,642 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:36:38,642 INFO L482 AbstractCegarLoop]: Abstraction has 14808 states and 56025 transitions. [2021-05-22 01:36:38,642 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 19 states, 18 states have (on average 1.8333333333333333) internal successors, (33), 18 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:36:38,642 INFO L276 IsEmpty]: Start isEmpty. Operand 14808 states and 56025 transitions. [2021-05-22 01:36:38,645 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-22 01:36:38,645 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:36:38,645 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:36:38,845 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 61 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable66 [2021-05-22 01:36:38,846 INFO L430 AbstractCegarLoop]: === Iteration 22 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:36:38,846 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:36:38,846 INFO L82 PathProgramCache]: Analyzing trace with hash 1125727984, now seen corresponding path program 2 times [2021-05-22 01:36:38,846 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:36:38,846 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1658977254] [2021-05-22 01:36:38,846 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:36:38,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:36:38,893 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 12 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:36:38,894 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:36:38,894 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1658977254] [2021-05-22 01:36:38,894 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1658977254] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:36:38,894 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [303654877] [2021-05-22 01:36:38,894 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 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:36:38,914 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 01:36:38,915 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 01:36:38,915 INFO L263 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-22 01:36:38,915 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:36:39,010 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 1 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-05-22 01:36:39,010 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [303654877] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:36:39,010 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:36:39,010 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8] total 17 [2021-05-22 01:36:39,010 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1953076144] [2021-05-22 01:36:39,010 INFO L462 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-22 01:36:39,010 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:36:39,011 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-22 01:36:39,011 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=288, Unknown=0, NotChecked=0, Total=342 [2021-05-22 01:36:39,011 INFO L87 Difference]: Start difference. First operand 14808 states and 56025 transitions. Second operand has 19 states, 18 states have (on average 1.8333333333333333) internal successors, (33), 18 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:36:40,625 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:36:40,625 INFO L93 Difference]: Finished difference Result 64597 states and 232784 transitions. [2021-05-22 01:36:40,626 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-05-22 01:36:40,626 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 1.8333333333333333) internal successors, (33), 18 states have internal predecessors, (33), 0 states have call successors, (0), 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 18 [2021-05-22 01:36:40,626 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:36:40,784 INFO L225 Difference]: With dead ends: 64597 [2021-05-22 01:36:40,784 INFO L226 Difference]: Without dead ends: 62791 [2021-05-22 01:36:40,784 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 851 ImplicationChecksByTransitivity, 682.4ms TimeCoverageRelationStatistics Valid=864, Invalid=2676, Unknown=0, NotChecked=0, Total=3540 [2021-05-22 01:36:40,999 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62791 states. [2021-05-22 01:36:41,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62791 to 13749. [2021-05-22 01:36:41,576 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13749 states, 13719 states have (on average 3.764924557183468) internal successors, (51651), 13748 states have internal predecessors, (51651), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:36:41,608 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13749 states to 13749 states and 51651 transitions. [2021-05-22 01:36:41,608 INFO L78 Accepts]: Start accepts. Automaton has 13749 states and 51651 transitions. Word has length 18 [2021-05-22 01:36:41,608 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:36:41,608 INFO L482 AbstractCegarLoop]: Abstraction has 13749 states and 51651 transitions. [2021-05-22 01:36:41,608 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 19 states, 18 states have (on average 1.8333333333333333) internal successors, (33), 18 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:36:41,608 INFO L276 IsEmpty]: Start isEmpty. Operand 13749 states and 51651 transitions. [2021-05-22 01:36:41,613 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 01:36:41,613 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:36:41,613 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:36:41,816 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable67,62 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:36:41,817 INFO L430 AbstractCegarLoop]: === Iteration 23 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:36:41,817 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:36:41,817 INFO L82 PathProgramCache]: Analyzing trace with hash 16696332, now seen corresponding path program 1 times [2021-05-22 01:36:41,817 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:36:41,817 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [215582626] [2021-05-22 01:36:41,817 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:36:41,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:36:41,873 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-22 01:36:41,873 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:36:41,873 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [215582626] [2021-05-22 01:36:41,874 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [215582626] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:36:41,874 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1495135023] [2021-05-22 01:36:41,874 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 63 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 63 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:36:41,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:36:41,895 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-22 01:36:41,895 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:36:42,033 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 2 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:36:42,033 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1495135023] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:36:42,033 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:36:42,034 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 12] total 20 [2021-05-22 01:36:42,034 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [931065515] [2021-05-22 01:36:42,034 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-22 01:36:42,034 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:36:42,034 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-22 01:36:42,034 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=385, Unknown=0, NotChecked=0, Total=462 [2021-05-22 01:36:42,034 INFO L87 Difference]: Start difference. First operand 13749 states and 51651 transitions. Second operand has 22 states, 21 states have (on average 1.7142857142857142) internal successors, (36), 21 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:36:43,454 WARN L205 SmtUtils]: Spent 189.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 14 [2021-05-22 01:36:46,952 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:36:46,952 INFO L93 Difference]: Finished difference Result 124064 states and 422755 transitions. [2021-05-22 01:36:46,952 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 162 states. [2021-05-22 01:36:46,952 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 1.7142857142857142) internal successors, (36), 21 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 01:36:46,952 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:36:47,285 INFO L225 Difference]: With dead ends: 124064 [2021-05-22 01:36:47,286 INFO L226 Difference]: Without dead ends: 120743 [2021-05-22 01:36:47,287 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 187 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 176 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12591 ImplicationChecksByTransitivity, 2809.0ms TimeCoverageRelationStatistics Valid=4885, Invalid=26621, Unknown=0, NotChecked=0, Total=31506 [2021-05-22 01:36:47,974 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120743 states. [2021-05-22 01:36:48,724 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120743 to 14593. [2021-05-22 01:36:48,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14593 states, 14563 states have (on average 3.772436997871318) internal successors, (54938), 14592 states have internal predecessors, (54938), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:36:48,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14593 states to 14593 states and 54938 transitions. [2021-05-22 01:36:48,781 INFO L78 Accepts]: Start accepts. Automaton has 14593 states and 54938 transitions. Word has length 20 [2021-05-22 01:36:48,781 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:36:48,781 INFO L482 AbstractCegarLoop]: Abstraction has 14593 states and 54938 transitions. [2021-05-22 01:36:48,781 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 21 states have (on average 1.7142857142857142) internal successors, (36), 21 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:36:48,781 INFO L276 IsEmpty]: Start isEmpty. Operand 14593 states and 54938 transitions. [2021-05-22 01:36:48,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 01:36:48,787 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:36:48,787 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:36:48,987 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 63 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable68 [2021-05-22 01:36:48,987 INFO L430 AbstractCegarLoop]: === Iteration 24 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:36:48,987 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:36:48,988 INFO L82 PathProgramCache]: Analyzing trace with hash -164625101, now seen corresponding path program 1 times [2021-05-22 01:36:48,988 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:36:48,988 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1134594138] [2021-05-22 01:36:48,988 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:36:48,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:36:49,039 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 8 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-22 01:36:49,040 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:36:49,040 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1134594138] [2021-05-22 01:36:49,040 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1134594138] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:36:49,040 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1521240601] [2021-05-22 01:36:49,040 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:36:49,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:36:49,062 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-22 01:36:49,063 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:36:49,502 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:36:49,502 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1521240601] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:36:49,502 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:36:49,502 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 12] total 20 [2021-05-22 01:36:49,503 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [762562327] [2021-05-22 01:36:49,503 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-22 01:36:49,503 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:36:49,503 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-22 01:36:49,503 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=383, Unknown=0, NotChecked=0, Total=462 [2021-05-22 01:36:49,503 INFO L87 Difference]: Start difference. First operand 14593 states and 54938 transitions. Second operand has 22 states, 21 states have (on average 1.7619047619047619) internal successors, (37), 21 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:36:53,692 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:36:53,693 INFO L93 Difference]: Finished difference Result 115370 states and 392053 transitions. [2021-05-22 01:36:53,693 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 144 states. [2021-05-22 01:36:53,693 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 1.7619047619047619) internal successors, (37), 21 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 01:36:53,693 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:36:53,994 INFO L225 Difference]: With dead ends: 115370 [2021-05-22 01:36:53,994 INFO L226 Difference]: Without dead ends: 111959 [2021-05-22 01:36:53,995 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 158 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9896 ImplicationChecksByTransitivity, 2577.9ms TimeCoverageRelationStatistics Valid=3915, Invalid=21525, Unknown=0, NotChecked=0, Total=25440 [2021-05-22 01:36:54,656 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111959 states. [2021-05-22 01:36:55,598 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111959 to 15307. [2021-05-22 01:36:55,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15307 states, 15277 states have (on average 3.804019113700334) internal successors, (58114), 15306 states have internal predecessors, (58114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:36:55,657 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15307 states to 15307 states and 58114 transitions. [2021-05-22 01:36:55,657 INFO L78 Accepts]: Start accepts. Automaton has 15307 states and 58114 transitions. Word has length 20 [2021-05-22 01:36:55,657 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:36:55,657 INFO L482 AbstractCegarLoop]: Abstraction has 15307 states and 58114 transitions. [2021-05-22 01:36:55,657 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 21 states have (on average 1.7619047619047619) internal successors, (37), 21 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:36:55,658 INFO L276 IsEmpty]: Start isEmpty. Operand 15307 states and 58114 transitions. [2021-05-22 01:36:55,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 01:36:55,664 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:36:55,664 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:36:55,864 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable69,64 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:36:55,864 INFO L430 AbstractCegarLoop]: === Iteration 25 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:36:55,864 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:36:55,865 INFO L82 PathProgramCache]: Analyzing trace with hash -1455834228, now seen corresponding path program 2 times [2021-05-22 01:36:55,865 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:36:55,865 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1587163259] [2021-05-22 01:36:55,865 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:36:55,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:36:55,948 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 10 proven. 3 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-22 01:36:55,948 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:36:55,948 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1587163259] [2021-05-22 01:36:55,948 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1587163259] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:36:55,948 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [376886078] [2021-05-22 01:36:55,949 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 65 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 65 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:36:55,973 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 01:36:55,974 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 01:36:55,974 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-22 01:36:55,975 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:36:56,130 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 2 proven. 12 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-22 01:36:56,130 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [376886078] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:36:56,130 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:36:56,131 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 21 [2021-05-22 01:36:56,131 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2001710776] [2021-05-22 01:36:56,131 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-22 01:36:56,131 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:36:56,131 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-22 01:36:56,131 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=430, Unknown=0, NotChecked=0, Total=506 [2021-05-22 01:36:56,131 INFO L87 Difference]: Start difference. First operand 15307 states and 58114 transitions. Second operand has 23 states, 22 states have (on average 1.7272727272727273) internal successors, (38), 22 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:37:02,920 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:37:02,920 INFO L93 Difference]: Finished difference Result 146469 states and 500098 transitions. [2021-05-22 01:37:02,921 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 212 states. [2021-05-22 01:37:02,921 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 22 states have (on average 1.7272727272727273) internal successors, (38), 22 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 01:37:02,921 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:37:03,651 INFO L225 Difference]: With dead ends: 146469 [2021-05-22 01:37:03,651 INFO L226 Difference]: Without dead ends: 141792 [2021-05-22 01:37:03,653 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 238 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 228 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22202 ImplicationChecksByTransitivity, 4188.8ms TimeCoverageRelationStatistics Valid=7953, Invalid=44717, Unknown=0, NotChecked=0, Total=52670 [2021-05-22 01:37:04,111 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141792 states. [2021-05-22 01:37:05,302 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141792 to 15036. [2021-05-22 01:37:05,322 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15036 states, 15006 states have (on average 3.7711582033853124) internal successors, (56590), 15035 states have internal predecessors, (56590), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:37:05,361 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15036 states to 15036 states and 56590 transitions. [2021-05-22 01:37:05,361 INFO L78 Accepts]: Start accepts. Automaton has 15036 states and 56590 transitions. Word has length 20 [2021-05-22 01:37:05,361 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:37:05,361 INFO L482 AbstractCegarLoop]: Abstraction has 15036 states and 56590 transitions. [2021-05-22 01:37:05,361 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 22 states have (on average 1.7272727272727273) internal successors, (38), 22 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:37:05,361 INFO L276 IsEmpty]: Start isEmpty. Operand 15036 states and 56590 transitions. [2021-05-22 01:37:05,367 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 01:37:05,367 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:37:05,367 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:37:05,568 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable70,65 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:37:05,568 INFO L430 AbstractCegarLoop]: === Iteration 26 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:37:05,568 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:37:05,568 INFO L82 PathProgramCache]: Analyzing trace with hash -1455844143, now seen corresponding path program 2 times [2021-05-22 01:37:05,568 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:37:05,568 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [541008202] [2021-05-22 01:37:05,568 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:37:05,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:37:05,629 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 10 proven. 3 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-22 01:37:05,629 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:37:05,629 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [541008202] [2021-05-22 01:37:05,629 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [541008202] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:37:05,629 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1997648696] [2021-05-22 01:37:05,630 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 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:37:05,654 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 01:37:05,654 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 01:37:05,655 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-22 01:37:05,655 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:37:05,797 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 2 proven. 12 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-22 01:37:05,798 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1997648696] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:37:05,798 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:37:05,798 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 21 [2021-05-22 01:37:05,798 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [410518152] [2021-05-22 01:37:05,798 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-22 01:37:05,798 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:37:05,798 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-22 01:37:05,798 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=430, Unknown=0, NotChecked=0, Total=506 [2021-05-22 01:37:05,799 INFO L87 Difference]: Start difference. First operand 15036 states and 56590 transitions. Second operand has 23 states, 22 states have (on average 1.7272727272727273) internal successors, (38), 22 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:37:10,383 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:37:10,383 INFO L93 Difference]: Finished difference Result 89802 states and 307440 transitions. [2021-05-22 01:37:10,383 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 135 states. [2021-05-22 01:37:10,384 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 22 states have (on average 1.7272727272727273) internal successors, (38), 22 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 01:37:10,384 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:37:10,593 INFO L225 Difference]: With dead ends: 89802 [2021-05-22 01:37:10,593 INFO L226 Difference]: Without dead ends: 84231 [2021-05-22 01:37:10,594 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 151 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8686 ImplicationChecksByTransitivity, 2570.7ms TimeCoverageRelationStatistics Valid=3742, Invalid=19514, Unknown=0, NotChecked=0, Total=23256 [2021-05-22 01:37:10,878 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84231 states. [2021-05-22 01:37:11,575 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84231 to 14246. [2021-05-22 01:37:11,592 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14246 states, 14216 states have (on average 3.7462718064153067) internal successors, (53257), 14245 states have internal predecessors, (53257), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:37:11,626 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14246 states to 14246 states and 53257 transitions. [2021-05-22 01:37:11,627 INFO L78 Accepts]: Start accepts. Automaton has 14246 states and 53257 transitions. Word has length 20 [2021-05-22 01:37:11,627 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:37:11,627 INFO L482 AbstractCegarLoop]: Abstraction has 14246 states and 53257 transitions. [2021-05-22 01:37:11,627 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 22 states have (on average 1.7272727272727273) internal successors, (38), 22 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:37:11,627 INFO L276 IsEmpty]: Start isEmpty. Operand 14246 states and 53257 transitions. [2021-05-22 01:37:11,634 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 01:37:11,634 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:37:11,634 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:37:11,834 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 66 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable71 [2021-05-22 01:37:11,834 INFO L430 AbstractCegarLoop]: === Iteration 27 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:37:11,835 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:37:11,835 INFO L82 PathProgramCache]: Analyzing trace with hash 110178282, now seen corresponding path program 3 times [2021-05-22 01:37:11,835 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:37:11,835 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [225306225] [2021-05-22 01:37:11,835 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:37:11,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:37:11,878 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-22 01:37:11,878 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:37:11,878 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [225306225] [2021-05-22 01:37:11,878 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [225306225] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:37:11,878 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1424913662] [2021-05-22 01:37:11,878 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 67 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 67 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:37:11,897 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-22 01:37:11,898 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 01:37:11,900 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-22 01:37:11,901 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:37:12,041 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 4 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:37:12,041 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1424913662] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:37:12,041 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:37:12,041 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 12] total 20 [2021-05-22 01:37:12,041 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1730914541] [2021-05-22 01:37:12,041 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-22 01:37:12,041 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:37:12,041 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-22 01:37:12,041 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=382, Unknown=0, NotChecked=0, Total=462 [2021-05-22 01:37:12,041 INFO L87 Difference]: Start difference. First operand 14246 states and 53257 transitions. Second operand has 22 states, 21 states have (on average 1.7619047619047619) internal successors, (37), 21 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:37:18,652 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:37:18,652 INFO L93 Difference]: Finished difference Result 137309 states and 465635 transitions. [2021-05-22 01:37:18,652 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 220 states. [2021-05-22 01:37:18,653 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 1.7619047619047619) internal successors, (37), 21 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 01:37:18,653 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:37:19,011 INFO L225 Difference]: With dead ends: 137309 [2021-05-22 01:37:19,011 INFO L226 Difference]: Without dead ends: 132440 [2021-05-22 01:37:19,012 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 234 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23081 ImplicationChecksByTransitivity, 3584.0ms TimeCoverageRelationStatistics Valid=8220, Invalid=47240, Unknown=0, NotChecked=0, Total=55460 [2021-05-22 01:37:19,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132440 states. [2021-05-22 01:37:20,515 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132440 to 13987. [2021-05-22 01:37:20,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13987 states, 13957 states have (on average 3.738410833273626) internal successors, (52177), 13986 states have internal predecessors, (52177), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:37:20,566 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13987 states to 13987 states and 52177 transitions. [2021-05-22 01:37:20,566 INFO L78 Accepts]: Start accepts. Automaton has 13987 states and 52177 transitions. Word has length 20 [2021-05-22 01:37:20,566 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:37:20,566 INFO L482 AbstractCegarLoop]: Abstraction has 13987 states and 52177 transitions. [2021-05-22 01:37:20,566 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 21 states have (on average 1.7619047619047619) internal successors, (37), 21 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:37:20,566 INFO L276 IsEmpty]: Start isEmpty. Operand 13987 states and 52177 transitions. [2021-05-22 01:37:20,572 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 01:37:20,572 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:37:20,572 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:37:20,773 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable72,67 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:37:20,773 INFO L430 AbstractCegarLoop]: === Iteration 28 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:37:20,773 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:37:20,773 INFO L82 PathProgramCache]: Analyzing trace with hash -1448532884, now seen corresponding path program 1 times [2021-05-22 01:37:20,773 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:37:20,774 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1981096922] [2021-05-22 01:37:20,774 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:37:20,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:37:20,816 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-22 01:37:20,817 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:37:20,817 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1981096922] [2021-05-22 01:37:20,817 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1981096922] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:37:20,817 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1170153222] [2021-05-22 01:37:20,817 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:37:20,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:37:20,837 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-22 01:37:20,837 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:37:20,968 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 2 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:37:20,968 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1170153222] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:37:20,968 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:37:20,968 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 12] total 19 [2021-05-22 01:37:20,968 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [235337574] [2021-05-22 01:37:20,969 INFO L462 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-22 01:37:20,969 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:37:20,969 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-22 01:37:20,969 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=350, Unknown=0, NotChecked=0, Total=420 [2021-05-22 01:37:20,969 INFO L87 Difference]: Start difference. First operand 13987 states and 52177 transitions. Second operand has 21 states, 20 states have (on average 1.8) internal successors, (36), 20 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:37:25,166 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:37:25,167 INFO L93 Difference]: Finished difference Result 112269 states and 380480 transitions. [2021-05-22 01:37:25,167 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 137 states. [2021-05-22 01:37:25,167 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 1.8) internal successors, (36), 20 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 01:37:25,167 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:37:25,609 INFO L225 Difference]: With dead ends: 112269 [2021-05-22 01:37:25,610 INFO L226 Difference]: Without dead ends: 108354 [2021-05-22 01:37:25,610 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 150 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8986 ImplicationChecksByTransitivity, 2012.9ms TimeCoverageRelationStatistics Valid=3541, Invalid=19411, Unknown=0, NotChecked=0, Total=22952 [2021-05-22 01:37:25,977 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108354 states. [2021-05-22 01:37:26,927 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108354 to 15105. [2021-05-22 01:37:26,945 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15105 states, 15075 states have (on average 3.7656384742951907) internal successors, (56767), 15104 states have internal predecessors, (56767), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:37:26,983 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15105 states to 15105 states and 56767 transitions. [2021-05-22 01:37:26,983 INFO L78 Accepts]: Start accepts. Automaton has 15105 states and 56767 transitions. Word has length 20 [2021-05-22 01:37:26,984 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:37:26,984 INFO L482 AbstractCegarLoop]: Abstraction has 15105 states and 56767 transitions. [2021-05-22 01:37:26,984 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 21 states, 20 states have (on average 1.8) internal successors, (36), 20 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:37:26,984 INFO L276 IsEmpty]: Start isEmpty. Operand 15105 states and 56767 transitions. [2021-05-22 01:37:26,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 01:37:26,990 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:37:26,990 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:37:27,191 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable73,68 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:37:27,191 INFO L430 AbstractCegarLoop]: === Iteration 29 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:37:27,192 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:37:27,192 INFO L82 PathProgramCache]: Analyzing trace with hash 1555215370, now seen corresponding path program 2 times [2021-05-22 01:37:27,192 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:37:27,192 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [648749244] [2021-05-22 01:37:27,192 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:37:27,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:37:27,240 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 9 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-22 01:37:27,240 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:37:27,240 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [648749244] [2021-05-22 01:37:27,240 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [648749244] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:37:27,240 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [934051495] [2021-05-22 01:37:27,240 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 69 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 69 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:37:27,259 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 01:37:27,260 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 01:37:27,260 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-22 01:37:27,260 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:37:27,405 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 2 proven. 12 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-22 01:37:27,406 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [934051495] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:37:27,406 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:37:27,406 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11] total 20 [2021-05-22 01:37:27,406 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [19006259] [2021-05-22 01:37:27,406 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-22 01:37:27,406 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:37:27,406 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-22 01:37:27,406 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=394, Unknown=0, NotChecked=0, Total=462 [2021-05-22 01:37:27,407 INFO L87 Difference]: Start difference. First operand 15105 states and 56767 transitions. Second operand has 22 states, 21 states have (on average 1.7619047619047619) internal successors, (37), 21 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:37:29,006 WARN L205 SmtUtils]: Spent 194.00 ms on a formula simplification that was a NOOP. DAG size: 20 [2021-05-22 01:37:30,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:37:30,728 INFO L93 Difference]: Finished difference Result 87215 states and 298663 transitions. [2021-05-22 01:37:30,729 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 108 states. [2021-05-22 01:37:30,729 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 1.7619047619047619) internal successors, (37), 21 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 01:37:30,729 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:37:31,167 INFO L225 Difference]: With dead ends: 87215 [2021-05-22 01:37:31,167 INFO L226 Difference]: Without dead ends: 81323 [2021-05-22 01:37:31,168 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5547 ImplicationChecksByTransitivity, 1914.6ms TimeCoverageRelationStatistics Valid=2787, Invalid=12713, Unknown=0, NotChecked=0, Total=15500 [2021-05-22 01:37:31,441 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81323 states. [2021-05-22 01:37:31,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81323 to 14471. [2021-05-22 01:37:31,956 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14471 states, 14441 states have (on average 3.7477321515130533) internal successors, (54121), 14470 states have internal predecessors, (54121), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:37:31,993 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14471 states to 14471 states and 54121 transitions. [2021-05-22 01:37:31,993 INFO L78 Accepts]: Start accepts. Automaton has 14471 states and 54121 transitions. Word has length 20 [2021-05-22 01:37:31,993 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:37:31,993 INFO L482 AbstractCegarLoop]: Abstraction has 14471 states and 54121 transitions. [2021-05-22 01:37:31,993 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 21 states have (on average 1.7619047619047619) internal successors, (37), 21 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:37:31,993 INFO L276 IsEmpty]: Start isEmpty. Operand 14471 states and 54121 transitions. [2021-05-22 01:37:31,999 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 01:37:31,999 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:37:31,999 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:37:32,200 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 69 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable74 [2021-05-22 01:37:32,200 INFO L430 AbstractCegarLoop]: === Iteration 30 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:37:32,200 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:37:32,200 INFO L82 PathProgramCache]: Analyzing trace with hash 1555220330, now seen corresponding path program 4 times [2021-05-22 01:37:32,200 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:37:32,200 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2014112834] [2021-05-22 01:37:32,200 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:37:32,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:37:32,429 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 9 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-22 01:37:32,429 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:37:32,429 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2014112834] [2021-05-22 01:37:32,429 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2014112834] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:37:32,429 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [968273927] [2021-05-22 01:37:32,429 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 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:37:32,473 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 01:37:32,473 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 01:37:32,474 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-22 01:37:32,474 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:37:32,611 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 4 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:37:32,611 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [968273927] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:37:32,611 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:37:32,611 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 12] total 21 [2021-05-22 01:37:32,611 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1129170919] [2021-05-22 01:37:32,611 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-22 01:37:32,611 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:37:32,611 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-22 01:37:32,611 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=425, Unknown=0, NotChecked=0, Total=506 [2021-05-22 01:37:32,612 INFO L87 Difference]: Start difference. First operand 14471 states and 54121 transitions. Second operand has 23 states, 22 states have (on average 1.6818181818181819) internal successors, (37), 22 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:37:37,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:37:37,093 INFO L93 Difference]: Finished difference Result 103358 states and 351171 transitions. [2021-05-22 01:37:37,094 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 156 states. [2021-05-22 01:37:37,094 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 22 states have (on average 1.6818181818181819) internal successors, (37), 22 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 01:37:37,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:37:37,554 INFO L225 Difference]: With dead ends: 103358 [2021-05-22 01:37:37,555 INFO L226 Difference]: Without dead ends: 100586 [2021-05-22 01:37:37,556 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 172 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11841 ImplicationChecksByTransitivity, 2365.7ms TimeCoverageRelationStatistics Valid=4710, Invalid=25392, Unknown=0, NotChecked=0, Total=30102 [2021-05-22 01:37:37,874 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100586 states. [2021-05-22 01:37:38,669 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100586 to 14291. [2021-05-22 01:37:38,685 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14291 states, 14261 states have (on average 3.732978052030012) internal successors, (53236), 14290 states have internal predecessors, (53236), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:37:38,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14291 states to 14291 states and 53236 transitions. [2021-05-22 01:37:38,720 INFO L78 Accepts]: Start accepts. Automaton has 14291 states and 53236 transitions. Word has length 20 [2021-05-22 01:37:38,720 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:37:38,720 INFO L482 AbstractCegarLoop]: Abstraction has 14291 states and 53236 transitions. [2021-05-22 01:37:38,721 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 22 states have (on average 1.6818181818181819) internal successors, (37), 22 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:37:38,721 INFO L276 IsEmpty]: Start isEmpty. Operand 14291 states and 53236 transitions. [2021-05-22 01:37:38,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 01:37:38,727 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:37:38,727 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:37:38,927 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable75,70 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:37:38,927 INFO L430 AbstractCegarLoop]: === Iteration 31 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:37:38,927 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:37:38,928 INFO L82 PathProgramCache]: Analyzing trace with hash 928560718, now seen corresponding path program 3 times [2021-05-22 01:37:38,928 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:37:38,928 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1509410066] [2021-05-22 01:37:38,928 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:37:38,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:37:38,975 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 8 proven. 5 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-22 01:37:38,976 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:37:38,976 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1509410066] [2021-05-22 01:37:38,976 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1509410066] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:37:38,976 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [493165735] [2021-05-22 01:37:38,976 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 71 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 71 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:37:39,011 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-22 01:37:39,012 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 01:37:39,012 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-22 01:37:39,012 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:37:39,145 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:37:39,146 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [493165735] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:37:39,146 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:37:39,146 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 12] total 20 [2021-05-22 01:37:39,146 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2107440364] [2021-05-22 01:37:39,146 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-22 01:37:39,146 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:37:39,146 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-22 01:37:39,146 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=384, Unknown=0, NotChecked=0, Total=462 [2021-05-22 01:37:39,146 INFO L87 Difference]: Start difference. First operand 14291 states and 53236 transitions. Second operand has 22 states, 21 states have (on average 1.8095238095238095) internal successors, (38), 21 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:37:41,676 WARN L205 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 17 [2021-05-22 01:37:44,213 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:37:44,213 INFO L93 Difference]: Finished difference Result 109923 states and 373049 transitions. [2021-05-22 01:37:44,213 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 167 states. [2021-05-22 01:37:44,213 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 1.8095238095238095) internal successors, (38), 21 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 01:37:44,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:37:44,500 INFO L225 Difference]: With dead ends: 109923 [2021-05-22 01:37:44,500 INFO L226 Difference]: Without dead ends: 105297 [2021-05-22 01:37:44,501 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 181 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13031 ImplicationChecksByTransitivity, 2596.1ms TimeCoverageRelationStatistics Valid=5149, Invalid=28157, Unknown=0, NotChecked=0, Total=33306 [2021-05-22 01:37:44,841 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105297 states. [2021-05-22 01:37:45,733 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105297 to 14130. [2021-05-22 01:37:45,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14130 states, 14100 states have (on average 3.7224113475177303) internal successors, (52486), 14129 states have internal predecessors, (52486), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:37:45,783 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14130 states to 14130 states and 52486 transitions. [2021-05-22 01:37:45,783 INFO L78 Accepts]: Start accepts. Automaton has 14130 states and 52486 transitions. Word has length 20 [2021-05-22 01:37:45,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:37:45,783 INFO L482 AbstractCegarLoop]: Abstraction has 14130 states and 52486 transitions. [2021-05-22 01:37:45,783 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 21 states have (on average 1.8095238095238095) internal successors, (38), 21 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:37:45,784 INFO L276 IsEmpty]: Start isEmpty. Operand 14130 states and 52486 transitions. [2021-05-22 01:37:45,790 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 01:37:45,790 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:37:45,790 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:37:45,990 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 71 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable76 [2021-05-22 01:37:45,991 INFO L430 AbstractCegarLoop]: === Iteration 32 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:37:45,991 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:37:45,991 INFO L82 PathProgramCache]: Analyzing trace with hash 661892531, now seen corresponding path program 3 times [2021-05-22 01:37:45,991 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:37:45,991 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1006998027] [2021-05-22 01:37:45,991 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:37:46,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:37:46,081 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 8 proven. 5 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-22 01:37:46,081 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:37:46,081 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1006998027] [2021-05-22 01:37:46,081 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1006998027] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:37:46,081 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1117170386] [2021-05-22 01:37:46,081 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 72 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 72 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:37:46,104 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-22 01:37:46,104 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 01:37:46,105 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-22 01:37:46,105 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:37:46,245 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:37:46,246 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1117170386] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:37:46,246 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:37:46,246 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 12] total 20 [2021-05-22 01:37:46,246 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2124679649] [2021-05-22 01:37:46,246 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-22 01:37:46,246 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:37:46,246 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-22 01:37:46,246 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=384, Unknown=0, NotChecked=0, Total=462 [2021-05-22 01:37:46,246 INFO L87 Difference]: Start difference. First operand 14130 states and 52486 transitions. Second operand has 22 states, 21 states have (on average 1.8095238095238095) internal successors, (38), 21 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:37:51,184 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:37:51,184 INFO L93 Difference]: Finished difference Result 111174 states and 381892 transitions. [2021-05-22 01:37:51,184 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 163 states. [2021-05-22 01:37:51,185 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 1.8095238095238095) internal successors, (38), 21 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 01:37:51,185 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:37:51,462 INFO L225 Difference]: With dead ends: 111174 [2021-05-22 01:37:51,462 INFO L226 Difference]: Without dead ends: 108447 [2021-05-22 01:37:51,463 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 177 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12483 ImplicationChecksByTransitivity, 2395.5ms TimeCoverageRelationStatistics Valid=4843, Invalid=27019, Unknown=0, NotChecked=0, Total=31862 [2021-05-22 01:37:52,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108447 states. [2021-05-22 01:37:52,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108447 to 14184. [2021-05-22 01:37:52,667 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14184 states, 14154 states have (on average 3.732019217182422) internal successors, (52823), 14183 states have internal predecessors, (52823), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:37:52,701 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14184 states to 14184 states and 52823 transitions. [2021-05-22 01:37:52,701 INFO L78 Accepts]: Start accepts. Automaton has 14184 states and 52823 transitions. Word has length 20 [2021-05-22 01:37:52,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:37:52,701 INFO L482 AbstractCegarLoop]: Abstraction has 14184 states and 52823 transitions. [2021-05-22 01:37:52,701 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 22 states, 21 states have (on average 1.8095238095238095) internal successors, (38), 21 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:37:52,702 INFO L276 IsEmpty]: Start isEmpty. Operand 14184 states and 52823 transitions. [2021-05-22 01:37:52,708 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 01:37:52,708 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:37:52,708 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:37:52,908 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 72 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable77 [2021-05-22 01:37:52,909 INFO L430 AbstractCegarLoop]: === Iteration 33 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:37:52,909 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:37:52,909 INFO L82 PathProgramCache]: Analyzing trace with hash -895984788, now seen corresponding path program 4 times [2021-05-22 01:37:52,909 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:37:52,909 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1499419942] [2021-05-22 01:37:52,909 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:37:52,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:37:52,960 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 10 proven. 3 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-22 01:37:52,960 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:37:52,961 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1499419942] [2021-05-22 01:37:52,961 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1499419942] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:37:52,961 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1345265849] [2021-05-22 01:37:52,961 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 73 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 73 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:37:52,993 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 01:37:52,993 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 01:37:52,993 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-22 01:37:52,994 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:37:53,159 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:37:53,160 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1345265849] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:37:53,160 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:37:53,160 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 12] total 21 [2021-05-22 01:37:53,160 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1145573734] [2021-05-22 01:37:53,160 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-22 01:37:53,160 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:37:53,160 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-22 01:37:53,161 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=423, Unknown=0, NotChecked=0, Total=506 [2021-05-22 01:37:53,161 INFO L87 Difference]: Start difference. First operand 14184 states and 52823 transitions. Second operand has 23 states, 22 states have (on average 1.7272727272727273) internal successors, (38), 22 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:37:56,984 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:37:56,984 INFO L93 Difference]: Finished difference Result 90037 states and 306719 transitions. [2021-05-22 01:37:56,984 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 123 states. [2021-05-22 01:37:56,985 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 22 states have (on average 1.7272727272727273) internal successors, (38), 22 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 01:37:56,985 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:37:57,196 INFO L225 Difference]: With dead ends: 90037 [2021-05-22 01:37:57,196 INFO L226 Difference]: Without dead ends: 86625 [2021-05-22 01:37:57,197 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 139 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7237 ImplicationChecksByTransitivity, 1687.8ms TimeCoverageRelationStatistics Valid=3366, Invalid=16374, Unknown=0, NotChecked=0, Total=19740 [2021-05-22 01:37:57,492 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86625 states. [2021-05-22 01:37:58,229 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86625 to 13849. [2021-05-22 01:37:58,246 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13849 states, 13819 states have (on average 3.6978073666690787) internal successors, (51100), 13848 states have internal predecessors, (51100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:37:58,279 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13849 states to 13849 states and 51100 transitions. [2021-05-22 01:37:58,279 INFO L78 Accepts]: Start accepts. Automaton has 13849 states and 51100 transitions. Word has length 20 [2021-05-22 01:37:58,280 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:37:58,280 INFO L482 AbstractCegarLoop]: Abstraction has 13849 states and 51100 transitions. [2021-05-22 01:37:58,280 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 22 states have (on average 1.7272727272727273) internal successors, (38), 22 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:37:58,280 INFO L276 IsEmpty]: Start isEmpty. Operand 13849 states and 51100 transitions. [2021-05-22 01:37:58,286 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 01:37:58,286 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:37:58,286 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:37:58,487 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 73 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable78 [2021-05-22 01:37:58,487 INFO L430 AbstractCegarLoop]: === Iteration 34 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:37:58,487 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:37:58,487 INFO L82 PathProgramCache]: Analyzing trace with hash -895989743, now seen corresponding path program 4 times [2021-05-22 01:37:58,487 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:37:58,487 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [496899741] [2021-05-22 01:37:58,487 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:37:58,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:37:58,535 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 10 proven. 3 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-22 01:37:58,535 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:37:58,535 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [496899741] [2021-05-22 01:37:58,535 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [496899741] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:37:58,535 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1211796051] [2021-05-22 01:37:58,535 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 74 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 74 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:37:58,556 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 01:37:58,556 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 01:37:58,556 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-22 01:37:58,556 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:37:58,699 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:37:58,699 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1211796051] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:37:58,699 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:37:58,699 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 12] total 21 [2021-05-22 01:37:58,699 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [725765190] [2021-05-22 01:37:58,699 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-22 01:37:58,699 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:37:58,700 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-22 01:37:58,700 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=423, Unknown=0, NotChecked=0, Total=506 [2021-05-22 01:37:58,700 INFO L87 Difference]: Start difference. First operand 13849 states and 51100 transitions. Second operand has 23 states, 22 states have (on average 1.7272727272727273) internal successors, (38), 22 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:38:02,163 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:38:02,163 INFO L93 Difference]: Finished difference Result 83985 states and 285638 transitions. [2021-05-22 01:38:02,164 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 114 states. [2021-05-22 01:38:02,164 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 22 states have (on average 1.7272727272727273) internal successors, (38), 22 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 01:38:02,164 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:38:02,339 INFO L225 Difference]: With dead ends: 83985 [2021-05-22 01:38:02,339 INFO L226 Difference]: Without dead ends: 80537 [2021-05-22 01:38:02,340 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 130 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6202 ImplicationChecksByTransitivity, 1669.6ms TimeCoverageRelationStatistics Valid=2941, Invalid=14351, Unknown=0, NotChecked=0, Total=17292 [2021-05-22 01:38:02,793 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80537 states. [2021-05-22 01:38:03,231 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80537 to 13213. [2021-05-22 01:38:03,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13213 states, 13183 states have (on average 3.661913069862702) internal successors, (48275), 13212 states have internal predecessors, (48275), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:38:03,279 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13213 states to 13213 states and 48275 transitions. [2021-05-22 01:38:03,279 INFO L78 Accepts]: Start accepts. Automaton has 13213 states and 48275 transitions. Word has length 20 [2021-05-22 01:38:03,280 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:38:03,280 INFO L482 AbstractCegarLoop]: Abstraction has 13213 states and 48275 transitions. [2021-05-22 01:38:03,280 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 23 states, 22 states have (on average 1.7272727272727273) internal successors, (38), 22 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:38:03,280 INFO L276 IsEmpty]: Start isEmpty. Operand 13213 states and 48275 transitions. [2021-05-22 01:38:03,286 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 01:38:03,286 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:38:03,286 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:38:03,487 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable79,74 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:38:03,487 INFO L430 AbstractCegarLoop]: === Iteration 35 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:38:03,487 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:38:03,487 INFO L82 PathProgramCache]: Analyzing trace with hash -502412406, now seen corresponding path program 5 times [2021-05-22 01:38:03,487 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:38:03,487 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [61848587] [2021-05-22 01:38:03,487 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:38:03,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:38:03,561 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 12 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:38:03,561 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:38:03,561 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [61848587] [2021-05-22 01:38:03,561 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [61848587] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:38:03,561 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [91460368] [2021-05-22 01:38:03,561 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 75 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 75 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:38:03,590 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-05-22 01:38:03,591 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 01:38:03,591 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-22 01:38:03,592 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:38:03,742 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 12 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:38:03,742 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [91460368] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:38:03,742 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:38:03,742 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 23 [2021-05-22 01:38:03,742 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [548762674] [2021-05-22 01:38:03,742 INFO L462 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-22 01:38:03,742 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:38:03,743 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-22 01:38:03,743 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=502, Unknown=0, NotChecked=0, Total=600 [2021-05-22 01:38:03,743 INFO L87 Difference]: Start difference. First operand 13213 states and 48275 transitions. Second operand has 25 states, 24 states have (on average 1.625) internal successors, (39), 24 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:38:08,200 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:38:08,200 INFO L93 Difference]: Finished difference Result 89637 states and 302269 transitions. [2021-05-22 01:38:08,200 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 151 states. [2021-05-22 01:38:08,200 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 1.625) internal successors, (39), 24 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 01:38:08,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:38:08,411 INFO L225 Difference]: With dead ends: 89637 [2021-05-22 01:38:08,411 INFO L226 Difference]: Without dead ends: 86823 [2021-05-22 01:38:08,412 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 170 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11122 ImplicationChecksByTransitivity, 2176.9ms TimeCoverageRelationStatistics Valid=4815, Invalid=24597, Unknown=0, NotChecked=0, Total=29412 [2021-05-22 01:38:08,871 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86823 states. [2021-05-22 01:38:09,359 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86823 to 12694. [2021-05-22 01:38:09,374 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12694 states, 12664 states have (on average 3.636370814908402) internal successors, (46051), 12693 states have internal predecessors, (46051), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:38:09,404 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12694 states to 12694 states and 46051 transitions. [2021-05-22 01:38:09,404 INFO L78 Accepts]: Start accepts. Automaton has 12694 states and 46051 transitions. Word has length 20 [2021-05-22 01:38:09,404 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:38:09,404 INFO L482 AbstractCegarLoop]: Abstraction has 12694 states and 46051 transitions. [2021-05-22 01:38:09,404 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 25 states, 24 states have (on average 1.625) internal successors, (39), 24 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:38:09,404 INFO L276 IsEmpty]: Start isEmpty. Operand 12694 states and 46051 transitions. [2021-05-22 01:38:09,410 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 01:38:09,410 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:38:09,410 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:38:09,610 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable80,75 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:38:09,611 INFO L430 AbstractCegarLoop]: === Iteration 36 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:38:09,611 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:38:09,611 INFO L82 PathProgramCache]: Analyzing trace with hash -502407446, now seen corresponding path program 5 times [2021-05-22 01:38:09,611 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:38:09,611 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1537691586] [2021-05-22 01:38:09,611 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:38:09,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:38:09,674 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 12 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:38:09,674 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:38:09,674 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1537691586] [2021-05-22 01:38:09,674 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1537691586] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:38:09,674 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [304480593] [2021-05-22 01:38:09,674 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 76 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 76 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:38:09,695 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-05-22 01:38:09,696 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 01:38:09,696 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-22 01:38:09,696 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:38:09,840 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 12 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:38:09,840 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [304480593] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:38:09,840 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:38:09,840 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 23 [2021-05-22 01:38:09,841 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [669870722] [2021-05-22 01:38:09,841 INFO L462 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-22 01:38:09,841 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:38:09,841 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-22 01:38:09,841 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=502, Unknown=0, NotChecked=0, Total=600 [2021-05-22 01:38:09,841 INFO L87 Difference]: Start difference. First operand 12694 states and 46051 transitions. Second operand has 25 states, 24 states have (on average 1.625) internal successors, (39), 24 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:38:10,743 WARN L205 SmtUtils]: Spent 179.00 ms on a formula simplification that was a NOOP. DAG size: 13 [2021-05-22 01:38:14,267 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:38:14,267 INFO L93 Difference]: Finished difference Result 88510 states and 301236 transitions. [2021-05-22 01:38:14,268 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 148 states. [2021-05-22 01:38:14,268 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 1.625) internal successors, (39), 24 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 01:38:14,268 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:38:14,476 INFO L225 Difference]: With dead ends: 88510 [2021-05-22 01:38:14,476 INFO L226 Difference]: Without dead ends: 87235 [2021-05-22 01:38:14,477 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 167 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10674 ImplicationChecksByTransitivity, 2083.7ms TimeCoverageRelationStatistics Valid=4639, Invalid=23753, Unknown=0, NotChecked=0, Total=28392 [2021-05-22 01:38:14,760 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87235 states. [2021-05-22 01:38:15,474 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87235 to 12124. [2021-05-22 01:38:15,488 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12124 states, 12094 states have (on average 3.6021994377377213) internal successors, (43565), 12123 states have internal predecessors, (43565), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:38:15,517 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12124 states to 12124 states and 43565 transitions. [2021-05-22 01:38:15,517 INFO L78 Accepts]: Start accepts. Automaton has 12124 states and 43565 transitions. Word has length 20 [2021-05-22 01:38:15,517 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:38:15,517 INFO L482 AbstractCegarLoop]: Abstraction has 12124 states and 43565 transitions. [2021-05-22 01:38:15,517 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 25 states, 24 states have (on average 1.625) internal successors, (39), 24 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:38:15,517 INFO L276 IsEmpty]: Start isEmpty. Operand 12124 states and 43565 transitions. [2021-05-22 01:38:15,522 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 01:38:15,523 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:38:15,523 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:38:15,723 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable81,76 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:38:15,723 INFO L430 AbstractCegarLoop]: === Iteration 37 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:38:15,723 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:38:15,724 INFO L82 PathProgramCache]: Analyzing trace with hash -511935606, now seen corresponding path program 6 times [2021-05-22 01:38:15,724 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:38:15,724 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [972190735] [2021-05-22 01:38:15,724 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:38:15,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:38:15,788 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 12 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:38:15,789 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:38:15,789 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [972190735] [2021-05-22 01:38:15,789 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [972190735] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:38:15,789 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1470389811] [2021-05-22 01:38:15,789 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 77 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 77 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:38:15,820 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-05-22 01:38:15,820 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 01:38:15,820 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-22 01:38:15,821 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:38:15,979 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 12 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:38:15,979 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1470389811] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:38:15,979 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:38:15,979 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 23 [2021-05-22 01:38:15,980 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2010571389] [2021-05-22 01:38:15,980 INFO L462 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-22 01:38:15,980 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:38:15,980 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-22 01:38:15,980 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=502, Unknown=0, NotChecked=0, Total=600 [2021-05-22 01:38:15,980 INFO L87 Difference]: Start difference. First operand 12124 states and 43565 transitions. Second operand has 25 states, 24 states have (on average 1.625) internal successors, (39), 24 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:38:17,285 WARN L205 SmtUtils]: Spent 180.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2021-05-22 01:38:19,879 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:38:19,879 INFO L93 Difference]: Finished difference Result 74393 states and 251130 transitions. [2021-05-22 01:38:19,879 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 138 states. [2021-05-22 01:38:19,879 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 1.625) internal successors, (39), 24 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 01:38:19,880 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:38:20,042 INFO L225 Difference]: With dead ends: 74393 [2021-05-22 01:38:20,042 INFO L226 Difference]: Without dead ends: 73034 [2021-05-22 01:38:20,043 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 157 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9237 ImplicationChecksByTransitivity, 1940.3ms TimeCoverageRelationStatistics Valid=4142, Invalid=20980, Unknown=0, NotChecked=0, Total=25122 [2021-05-22 01:38:20,276 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73034 states. [2021-05-22 01:38:20,696 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73034 to 10664. [2021-05-22 01:38:20,709 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10664 states, 10634 states have (on average 3.578427684784653) internal successors, (38053), 10663 states have internal predecessors, (38053), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:38:20,732 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10664 states to 10664 states and 38053 transitions. [2021-05-22 01:38:20,732 INFO L78 Accepts]: Start accepts. Automaton has 10664 states and 38053 transitions. Word has length 20 [2021-05-22 01:38:20,732 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:38:20,732 INFO L482 AbstractCegarLoop]: Abstraction has 10664 states and 38053 transitions. [2021-05-22 01:38:20,732 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 25 states, 24 states have (on average 1.625) internal successors, (39), 24 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:38:20,732 INFO L276 IsEmpty]: Start isEmpty. Operand 10664 states and 38053 transitions. [2021-05-22 01:38:20,737 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 01:38:20,737 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:38:20,737 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:38:20,937 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable82,77 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:38:20,938 INFO L430 AbstractCegarLoop]: === Iteration 38 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:38:20,940 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:38:20,940 INFO L82 PathProgramCache]: Analyzing trace with hash -511940561, now seen corresponding path program 5 times [2021-05-22 01:38:20,941 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:38:20,941 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1577149106] [2021-05-22 01:38:20,941 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:38:20,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:38:21,001 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 12 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:38:21,001 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:38:21,001 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1577149106] [2021-05-22 01:38:21,001 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1577149106] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:38:21,001 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1227115500] [2021-05-22 01:38:21,002 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 78 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 78 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:38:21,021 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-05-22 01:38:21,022 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 01:38:21,022 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-22 01:38:21,022 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:38:21,320 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 12 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:38:21,320 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1227115500] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:38:21,320 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:38:21,320 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 23 [2021-05-22 01:38:21,320 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [689290755] [2021-05-22 01:38:21,320 INFO L462 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-22 01:38:21,320 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:38:21,321 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-22 01:38:21,321 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=502, Unknown=0, NotChecked=0, Total=600 [2021-05-22 01:38:21,321 INFO L87 Difference]: Start difference. First operand 10664 states and 38053 transitions. Second operand has 25 states, 24 states have (on average 1.625) internal successors, (39), 24 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:38:25,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:38:25,195 INFO L93 Difference]: Finished difference Result 69682 states and 238068 transitions. [2021-05-22 01:38:25,195 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 137 states. [2021-05-22 01:38:25,195 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 1.625) internal successors, (39), 24 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 01:38:25,196 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:38:25,361 INFO L225 Difference]: With dead ends: 69682 [2021-05-22 01:38:25,362 INFO L226 Difference]: Without dead ends: 68422 [2021-05-22 01:38:25,363 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 156 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9158 ImplicationChecksByTransitivity, 1856.1ms TimeCoverageRelationStatistics Valid=4090, Invalid=20716, Unknown=0, NotChecked=0, Total=24806 [2021-05-22 01:38:25,581 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68422 states. [2021-05-22 01:38:26,163 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68422 to 10193. [2021-05-22 01:38:26,174 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10193 states, 10163 states have (on average 3.5395060513627867) internal successors, (35972), 10192 states have internal predecessors, (35972), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:38:26,197 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10193 states to 10193 states and 35972 transitions. [2021-05-22 01:38:26,197 INFO L78 Accepts]: Start accepts. Automaton has 10193 states and 35972 transitions. Word has length 20 [2021-05-22 01:38:26,199 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:38:26,199 INFO L482 AbstractCegarLoop]: Abstraction has 10193 states and 35972 transitions. [2021-05-22 01:38:26,199 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 25 states, 24 states have (on average 1.625) internal successors, (39), 24 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:38:26,199 INFO L276 IsEmpty]: Start isEmpty. Operand 10193 states and 35972 transitions. [2021-05-22 01:38:26,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 01:38:26,204 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:38:26,204 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:38:26,405 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 78 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable83 [2021-05-22 01:38:26,405 INFO L430 AbstractCegarLoop]: === Iteration 39 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:38:26,405 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:38:26,405 INFO L82 PathProgramCache]: Analyzing trace with hash -507169046, now seen corresponding path program 6 times [2021-05-22 01:38:26,405 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:38:26,406 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [238336781] [2021-05-22 01:38:26,406 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:38:26,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:38:26,469 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 12 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:38:26,469 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:38:26,469 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [238336781] [2021-05-22 01:38:26,469 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [238336781] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:38:26,470 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [313868906] [2021-05-22 01:38:26,470 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 79 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 79 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:38:26,507 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-05-22 01:38:26,507 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 01:38:26,508 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-22 01:38:26,508 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:38:26,654 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 12 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:38:26,654 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [313868906] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:38:26,654 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:38:26,655 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 23 [2021-05-22 01:38:26,655 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [982373370] [2021-05-22 01:38:26,655 INFO L462 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-22 01:38:26,655 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:38:26,655 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-22 01:38:26,655 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=502, Unknown=0, NotChecked=0, Total=600 [2021-05-22 01:38:26,655 INFO L87 Difference]: Start difference. First operand 10193 states and 35972 transitions. Second operand has 25 states, 24 states have (on average 1.625) internal successors, (39), 24 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:38:30,556 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:38:30,556 INFO L93 Difference]: Finished difference Result 73158 states and 249229 transitions. [2021-05-22 01:38:30,557 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 146 states. [2021-05-22 01:38:30,557 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 1.625) internal successors, (39), 24 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 01:38:30,557 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:38:30,900 INFO L225 Difference]: With dead ends: 73158 [2021-05-22 01:38:30,901 INFO L226 Difference]: Without dead ends: 71790 [2021-05-22 01:38:30,901 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 165 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10445 ImplicationChecksByTransitivity, 1883.6ms TimeCoverageRelationStatistics Valid=4563, Invalid=23159, Unknown=0, NotChecked=0, Total=27722 [2021-05-22 01:38:31,119 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71790 states. [2021-05-22 01:38:31,487 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71790 to 8929. [2021-05-22 01:38:31,497 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8929 states, 8899 states have (on average 3.522867737948084) internal successors, (31350), 8928 states have internal predecessors, (31350), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:38:31,517 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8929 states to 8929 states and 31350 transitions. [2021-05-22 01:38:31,517 INFO L78 Accepts]: Start accepts. Automaton has 8929 states and 31350 transitions. Word has length 20 [2021-05-22 01:38:31,517 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:38:31,517 INFO L482 AbstractCegarLoop]: Abstraction has 8929 states and 31350 transitions. [2021-05-22 01:38:31,517 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 25 states, 24 states have (on average 1.625) internal successors, (39), 24 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:38:31,517 INFO L276 IsEmpty]: Start isEmpty. Operand 8929 states and 31350 transitions. [2021-05-22 01:38:31,522 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 01:38:31,522 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:38:31,522 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:38:31,722 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable84,79 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:38:31,723 INFO L430 AbstractCegarLoop]: === Iteration 40 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:38:31,723 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:38:31,723 INFO L82 PathProgramCache]: Analyzing trace with hash -507178961, now seen corresponding path program 6 times [2021-05-22 01:38:31,723 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:38:31,723 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [349789738] [2021-05-22 01:38:31,723 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:38:31,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:38:31,803 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 12 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:38:31,803 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:38:31,803 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [349789738] [2021-05-22 01:38:31,803 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [349789738] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:38:31,803 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1453866734] [2021-05-22 01:38:31,804 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 80 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 80 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:38:31,828 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-05-22 01:38:31,828 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 01:38:31,829 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-22 01:38:31,829 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:38:32,021 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 12 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:38:32,021 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1453866734] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:38:32,021 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:38:32,021 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 23 [2021-05-22 01:38:32,021 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [232564164] [2021-05-22 01:38:32,021 INFO L462 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-22 01:38:32,021 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:38:32,022 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-22 01:38:32,022 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=502, Unknown=0, NotChecked=0, Total=600 [2021-05-22 01:38:32,022 INFO L87 Difference]: Start difference. First operand 8929 states and 31350 transitions. Second operand has 25 states, 24 states have (on average 1.625) internal successors, (39), 24 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:38:35,167 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:38:35,167 INFO L93 Difference]: Finished difference Result 61552 states and 209638 transitions. [2021-05-22 01:38:35,168 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 112 states. [2021-05-22 01:38:35,168 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 1.625) internal successors, (39), 24 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 01:38:35,168 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:38:35,316 INFO L225 Difference]: With dead ends: 61552 [2021-05-22 01:38:35,316 INFO L226 Difference]: Without dead ends: 58801 [2021-05-22 01:38:35,317 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6233 ImplicationChecksByTransitivity, 1495.3ms TimeCoverageRelationStatistics Valid=2800, Invalid=14756, Unknown=0, NotChecked=0, Total=17556 [2021-05-22 01:38:35,497 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58801 states. [2021-05-22 01:38:35,827 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58801 to 7611. [2021-05-22 01:38:35,835 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7611 states, 7581 states have (on average 3.4874027173196147) internal successors, (26438), 7610 states have internal predecessors, (26438), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:38:35,851 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7611 states to 7611 states and 26438 transitions. [2021-05-22 01:38:35,852 INFO L78 Accepts]: Start accepts. Automaton has 7611 states and 26438 transitions. Word has length 20 [2021-05-22 01:38:35,852 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:38:35,852 INFO L482 AbstractCegarLoop]: Abstraction has 7611 states and 26438 transitions. [2021-05-22 01:38:35,852 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 25 states, 24 states have (on average 1.625) internal successors, (39), 24 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:38:35,852 INFO L276 IsEmpty]: Start isEmpty. Operand 7611 states and 26438 transitions. [2021-05-22 01:38:35,858 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-22 01:38:35,858 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:38:35,858 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:38:36,058 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable85,80 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:38:36,059 INFO L430 AbstractCegarLoop]: === Iteration 41 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:38:36,059 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:38:36,059 INFO L82 PathProgramCache]: Analyzing trace with hash 156516717, now seen corresponding path program 1 times [2021-05-22 01:38:36,059 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:38:36,059 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1282176451] [2021-05-22 01:38:36,059 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:38:36,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:38:36,114 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-22 01:38:36,114 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:38:36,114 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1282176451] [2021-05-22 01:38:36,114 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1282176451] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:38:36,114 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [968917824] [2021-05-22 01:38:36,114 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 81 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 81 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:38:36,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:38:36,145 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-22 01:38:36,146 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:38:36,308 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:38:36,309 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [968917824] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:38:36,309 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:38:36,309 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 14] total 22 [2021-05-22 01:38:36,309 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [607795037] [2021-05-22 01:38:36,309 INFO L462 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-22 01:38:36,309 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:38:36,309 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-22 01:38:36,309 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=470, Unknown=0, NotChecked=0, Total=552 [2021-05-22 01:38:36,309 INFO L87 Difference]: Start difference. First operand 7611 states and 26438 transitions. Second operand has 24 states, 23 states have (on average 1.6956521739130435) internal successors, (39), 23 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:38:48,325 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:38:48,325 INFO L93 Difference]: Finished difference Result 130893 states and 412051 transitions. [2021-05-22 01:38:48,325 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 435 states. [2021-05-22 01:38:48,326 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 1.6956521739130435) internal successors, (39), 23 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-05-22 01:38:48,326 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:38:48,646 INFO L225 Difference]: With dead ends: 130893 [2021-05-22 01:38:48,646 INFO L226 Difference]: Without dead ends: 125848 [2021-05-22 01:38:48,657 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 464 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 451 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 94844 ImplicationChecksByTransitivity, 8305.3ms TimeCoverageRelationStatistics Valid=20977, Invalid=183779, Unknown=0, NotChecked=0, Total=204756 [2021-05-22 01:38:49,333 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125848 states. [2021-05-22 01:38:50,171 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125848 to 7633. [2021-05-22 01:38:50,179 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7633 states, 7603 states have (on average 3.5011179797448375) internal successors, (26619), 7632 states have internal predecessors, (26619), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:38:50,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7633 states to 7633 states and 26619 transitions. [2021-05-22 01:38:50,195 INFO L78 Accepts]: Start accepts. Automaton has 7633 states and 26619 transitions. Word has length 22 [2021-05-22 01:38:50,195 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:38:50,195 INFO L482 AbstractCegarLoop]: Abstraction has 7633 states and 26619 transitions. [2021-05-22 01:38:50,195 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 24 states, 23 states have (on average 1.6956521739130435) internal successors, (39), 23 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:38:50,195 INFO L276 IsEmpty]: Start isEmpty. Operand 7633 states and 26619 transitions. [2021-05-22 01:38:50,200 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-22 01:38:50,200 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:38:50,200 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:38:50,401 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable86,81 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:38:50,402 INFO L430 AbstractCegarLoop]: === Iteration 42 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:38:50,402 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:38:50,402 INFO L82 PathProgramCache]: Analyzing trace with hash -1134702325, now seen corresponding path program 2 times [2021-05-22 01:38:50,402 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:38:50,402 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [91315339] [2021-05-22 01:38:50,402 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:38:50,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:38:50,456 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-22 01:38:50,457 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:38:50,457 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [91315339] [2021-05-22 01:38:50,457 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [91315339] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:38:50,457 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1153686014] [2021-05-22 01:38:50,457 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 82 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 82 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:38:50,477 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 01:38:50,478 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 01:38:50,478 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-22 01:38:50,478 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:38:50,644 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 2 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:38:50,645 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1153686014] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:38:50,645 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:38:50,645 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 14] total 24 [2021-05-22 01:38:50,645 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [566286195] [2021-05-22 01:38:50,645 INFO L462 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-22 01:38:50,645 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:38:50,645 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-22 01:38:50,645 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=557, Unknown=0, NotChecked=0, Total=650 [2021-05-22 01:38:50,645 INFO L87 Difference]: Start difference. First operand 7633 states and 26619 transitions. Second operand has 26 states, 25 states have (on average 1.6) internal successors, (40), 25 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) [2021-05-22 01:38:55,229 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 13 [2021-05-22 01:39:01,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:39:01,631 INFO L93 Difference]: Finished difference Result 120839 states and 386460 transitions. [2021-05-22 01:39:01,632 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 411 states. [2021-05-22 01:39:01,632 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 1.6) internal successors, (40), 25 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) Word has length 22 [2021-05-22 01:39:01,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:39:01,920 INFO L225 Difference]: With dead ends: 120839 [2021-05-22 01:39:01,920 INFO L226 Difference]: Without dead ends: 117432 [2021-05-22 01:39:01,926 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 440 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 429 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 84585 ImplicationChecksByTransitivity, 7164.5ms TimeCoverageRelationStatistics Valid=17986, Invalid=167344, Unknown=0, NotChecked=0, Total=185330 [2021-05-22 01:39:02,537 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117432 states. [2021-05-22 01:39:03,076 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117432 to 6828. [2021-05-22 01:39:03,083 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6828 states, 6798 states have (on average 3.516181229773463) internal successors, (23903), 6827 states have internal predecessors, (23903), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:39:03,098 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6828 states to 6828 states and 23903 transitions. [2021-05-22 01:39:03,098 INFO L78 Accepts]: Start accepts. Automaton has 6828 states and 23903 transitions. Word has length 22 [2021-05-22 01:39:03,098 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:39:03,098 INFO L482 AbstractCegarLoop]: Abstraction has 6828 states and 23903 transitions. [2021-05-22 01:39:03,099 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 26 states, 25 states have (on average 1.6) internal successors, (40), 25 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) [2021-05-22 01:39:03,099 INFO L276 IsEmpty]: Start isEmpty. Operand 6828 states and 23903 transitions. [2021-05-22 01:39:03,103 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-22 01:39:03,103 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:39:03,103 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:39:03,303 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable87,82 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:39:03,304 INFO L430 AbstractCegarLoop]: === Iteration 43 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:39:03,304 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:39:03,304 INFO L82 PathProgramCache]: Analyzing trace with hash -1761356977, now seen corresponding path program 3 times [2021-05-22 01:39:03,304 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:39:03,304 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [703916526] [2021-05-22 01:39:03,304 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:39:03,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:39:03,356 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 5 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-05-22 01:39:03,356 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:39:03,356 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [703916526] [2021-05-22 01:39:03,356 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [703916526] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:39:03,356 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2018050416] [2021-05-22 01:39:03,356 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 83 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 83 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:39:03,383 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-22 01:39:03,383 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 01:39:03,383 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-22 01:39:03,384 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:39:03,554 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:39:03,555 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2018050416] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:39:03,555 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:39:03,555 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 14] total 23 [2021-05-22 01:39:03,555 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1131702317] [2021-05-22 01:39:03,555 INFO L462 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-22 01:39:03,555 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:39:03,555 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-22 01:39:03,555 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=510, Unknown=0, NotChecked=0, Total=600 [2021-05-22 01:39:03,555 INFO L87 Difference]: Start difference. First operand 6828 states and 23903 transitions. Second operand has 25 states, 24 states have (on average 1.7083333333333333) internal successors, (41), 24 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:39:16,026 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:39:16,026 INFO L93 Difference]: Finished difference Result 141310 states and 453746 transitions. [2021-05-22 01:39:16,026 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 412 states. [2021-05-22 01:39:16,026 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 1.7083333333333333) internal successors, (41), 24 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-05-22 01:39:16,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:39:16,360 INFO L225 Difference]: With dead ends: 141310 [2021-05-22 01:39:16,360 INFO L226 Difference]: Without dead ends: 139177 [2021-05-22 01:39:16,366 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 442 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 430 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 82680 ImplicationChecksByTransitivity, 7786.8ms TimeCoverageRelationStatistics Valid=18222, Invalid=167970, Unknown=0, NotChecked=0, Total=186192 [2021-05-22 01:39:17,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139177 states. [2021-05-22 01:39:17,747 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139177 to 6729. [2021-05-22 01:39:17,754 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6729 states, 6699 states have (on average 3.5126138229586505) internal successors, (23531), 6728 states have internal predecessors, (23531), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:39:17,768 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6729 states to 6729 states and 23531 transitions. [2021-05-22 01:39:17,768 INFO L78 Accepts]: Start accepts. Automaton has 6729 states and 23531 transitions. Word has length 22 [2021-05-22 01:39:17,768 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:39:17,768 INFO L482 AbstractCegarLoop]: Abstraction has 6729 states and 23531 transitions. [2021-05-22 01:39:17,769 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 25 states, 24 states have (on average 1.7083333333333333) internal successors, (41), 24 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:39:17,769 INFO L276 IsEmpty]: Start isEmpty. Operand 6729 states and 23531 transitions. [2021-05-22 01:39:17,773 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-22 01:39:17,773 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:39:17,773 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:39:17,973 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 83 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable88 [2021-05-22 01:39:17,973 INFO L430 AbstractCegarLoop]: === Iteration 44 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:39:17,974 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:39:17,974 INFO L82 PathProgramCache]: Analyzing trace with hash 709064813, now seen corresponding path program 4 times [2021-05-22 01:39:17,974 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:39:17,974 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2008226306] [2021-05-22 01:39:17,974 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:39:17,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:39:18,029 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 8 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-22 01:39:18,029 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:39:18,029 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2008226306] [2021-05-22 01:39:18,029 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2008226306] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:39:18,029 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [699424575] [2021-05-22 01:39:18,029 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 84 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 84 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:39:18,051 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 01:39:18,051 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 01:39:18,052 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-22 01:39:18,052 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:39:18,217 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:39:18,217 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [699424575] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:39:18,217 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:39:18,217 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 14] total 24 [2021-05-22 01:39:18,218 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1329533692] [2021-05-22 01:39:18,218 INFO L462 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-22 01:39:18,218 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:39:18,218 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-22 01:39:18,218 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=555, Unknown=0, NotChecked=0, Total=650 [2021-05-22 01:39:18,218 INFO L87 Difference]: Start difference. First operand 6729 states and 23531 transitions. Second operand has 26 states, 25 states have (on average 1.64) internal successors, (41), 25 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:39:26,768 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:39:26,768 INFO L93 Difference]: Finished difference Result 95125 states and 305471 transitions. [2021-05-22 01:39:26,768 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 296 states. [2021-05-22 01:39:26,769 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 1.64) internal successors, (41), 25 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-05-22 01:39:26,769 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:39:26,999 INFO L225 Difference]: With dead ends: 95125 [2021-05-22 01:39:26,999 INFO L226 Difference]: Without dead ends: 93187 [2021-05-22 01:39:27,003 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 326 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 315 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43498 ImplicationChecksByTransitivity, 4776.7ms TimeCoverageRelationStatistics Valid=10519, Invalid=89653, Unknown=0, NotChecked=0, Total=100172 [2021-05-22 01:39:27,521 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93187 states. [2021-05-22 01:39:27,916 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93187 to 6580. [2021-05-22 01:39:27,923 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6580 states, 6550 states have (on average 3.5254961832061067) internal successors, (23092), 6579 states have internal predecessors, (23092), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:39:27,937 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6580 states to 6580 states and 23092 transitions. [2021-05-22 01:39:27,938 INFO L78 Accepts]: Start accepts. Automaton has 6580 states and 23092 transitions. Word has length 22 [2021-05-22 01:39:27,938 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:39:27,938 INFO L482 AbstractCegarLoop]: Abstraction has 6580 states and 23092 transitions. [2021-05-22 01:39:27,938 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 26 states, 25 states have (on average 1.64) internal successors, (41), 25 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:39:27,938 INFO L276 IsEmpty]: Start isEmpty. Operand 6580 states and 23092 transitions. [2021-05-22 01:39:27,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-22 01:39:27,942 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:39:27,942 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:39:28,142 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 84 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable89 [2021-05-22 01:39:28,142 INFO L430 AbstractCegarLoop]: === Iteration 45 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:39:28,143 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:39:28,143 INFO L82 PathProgramCache]: Analyzing trace with hash 1102637195, now seen corresponding path program 5 times [2021-05-22 01:39:28,143 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:39:28,143 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1146130418] [2021-05-22 01:39:28,143 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:39:28,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:39:28,221 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 10 proven. 3 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-22 01:39:28,222 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:39:28,222 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1146130418] [2021-05-22 01:39:28,222 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1146130418] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:39:28,222 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [391500030] [2021-05-22 01:39:28,222 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 85 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 85 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:39:28,243 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-05-22 01:39:28,243 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 01:39:28,244 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-22 01:39:28,244 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:39:28,420 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:39:28,420 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [391500030] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:39:28,420 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:39:28,420 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14] total 26 [2021-05-22 01:39:28,420 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1017398717] [2021-05-22 01:39:28,421 INFO L462 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-22 01:39:28,421 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:39:28,421 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-22 01:39:28,421 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=646, Unknown=0, NotChecked=0, Total=756 [2021-05-22 01:39:28,421 INFO L87 Difference]: Start difference. First operand 6580 states and 23092 transitions. Second operand has 28 states, 27 states have (on average 1.5555555555555556) internal successors, (42), 27 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:39:28,718 WARN L205 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 13 [2021-05-22 01:39:36,305 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:39:36,305 INFO L93 Difference]: Finished difference Result 96863 states and 310624 transitions. [2021-05-22 01:39:36,306 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 292 states. [2021-05-22 01:39:36,306 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 27 states have (on average 1.5555555555555556) internal successors, (42), 27 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-05-22 01:39:36,306 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:39:36,537 INFO L225 Difference]: With dead ends: 96863 [2021-05-22 01:39:36,537 INFO L226 Difference]: Without dead ends: 95855 [2021-05-22 01:39:36,541 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 323 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 314 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43291 ImplicationChecksByTransitivity, 4633.7ms TimeCoverageRelationStatistics Valid=10337, Invalid=89203, Unknown=0, NotChecked=0, Total=99540 [2021-05-22 01:39:37,076 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95855 states. [2021-05-22 01:39:37,499 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95855 to 6601. [2021-05-22 01:39:37,506 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6601 states, 6571 states have (on average 3.517272865621671) internal successors, (23112), 6600 states have internal predecessors, (23112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:39:37,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6601 states to 6601 states and 23112 transitions. [2021-05-22 01:39:37,521 INFO L78 Accepts]: Start accepts. Automaton has 6601 states and 23112 transitions. Word has length 22 [2021-05-22 01:39:37,521 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:39:37,521 INFO L482 AbstractCegarLoop]: Abstraction has 6601 states and 23112 transitions. [2021-05-22 01:39:37,521 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 28 states, 27 states have (on average 1.5555555555555556) internal successors, (42), 27 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:39:37,522 INFO L276 IsEmpty]: Start isEmpty. Operand 6601 states and 23112 transitions. [2021-05-22 01:39:37,525 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-22 01:39:37,525 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:39:37,525 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:39:37,726 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable90,85 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:39:37,726 INFO L430 AbstractCegarLoop]: === Iteration 46 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:39:37,726 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:39:37,726 INFO L82 PathProgramCache]: Analyzing trace with hash 1093113995, now seen corresponding path program 6 times [2021-05-22 01:39:37,726 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:39:37,727 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [184726474] [2021-05-22 01:39:37,727 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:39:37,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:39:37,796 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 10 proven. 3 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-22 01:39:37,797 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:39:37,797 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [184726474] [2021-05-22 01:39:37,797 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [184726474] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:39:37,797 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1410629783] [2021-05-22 01:39:37,797 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 86 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 86 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:39:37,818 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-05-22 01:39:37,819 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 01:39:37,819 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-22 01:39:37,819 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:39:38,026 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:39:38,026 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1410629783] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:39:38,027 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:39:38,027 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14] total 26 [2021-05-22 01:39:38,027 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [248232898] [2021-05-22 01:39:38,027 INFO L462 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-22 01:39:38,027 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:39:38,027 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-22 01:39:38,027 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=646, Unknown=0, NotChecked=0, Total=756 [2021-05-22 01:39:38,027 INFO L87 Difference]: Start difference. First operand 6601 states and 23112 transitions. Second operand has 28 states, 27 states have (on average 1.5555555555555556) internal successors, (42), 27 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:39:38,754 WARN L205 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2021-05-22 01:39:45,028 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:39:45,028 INFO L93 Difference]: Finished difference Result 92250 states and 296739 transitions. [2021-05-22 01:39:45,028 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 265 states. [2021-05-22 01:39:45,028 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 27 states have (on average 1.5555555555555556) internal successors, (42), 27 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-05-22 01:39:45,028 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:39:45,243 INFO L225 Difference]: With dead ends: 92250 [2021-05-22 01:39:45,244 INFO L226 Difference]: Without dead ends: 90945 [2021-05-22 01:39:45,246 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 296 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 287 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35664 ImplicationChecksByTransitivity, 4133.3ms TimeCoverageRelationStatistics Valid=8830, Invalid=74402, Unknown=0, NotChecked=0, Total=83232 [2021-05-22 01:39:45,540 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90945 states. [2021-05-22 01:39:46,007 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90945 to 6409. [2021-05-22 01:39:46,014 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6409 states, 6379 states have (on average 3.535977425928829) internal successors, (22556), 6408 states have internal predecessors, (22556), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:39:46,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6409 states to 6409 states and 22556 transitions. [2021-05-22 01:39:46,028 INFO L78 Accepts]: Start accepts. Automaton has 6409 states and 22556 transitions. Word has length 22 [2021-05-22 01:39:46,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:39:46,028 INFO L482 AbstractCegarLoop]: Abstraction has 6409 states and 22556 transitions. [2021-05-22 01:39:46,028 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 28 states, 27 states have (on average 1.5555555555555556) internal successors, (42), 27 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:39:46,028 INFO L276 IsEmpty]: Start isEmpty. Operand 6409 states and 22556 transitions. [2021-05-22 01:39:46,032 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-22 01:39:46,032 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:39:46,032 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:39:46,232 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable91,86 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:39:46,232 INFO L430 AbstractCegarLoop]: === Iteration 47 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:39:46,232 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:39:46,232 INFO L82 PathProgramCache]: Analyzing trace with hash -201642549, now seen corresponding path program 7 times [2021-05-22 01:39:46,233 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:39:46,233 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [924871052] [2021-05-22 01:39:46,233 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:39:46,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:39:46,282 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-05-22 01:39:46,282 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:39:46,282 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [924871052] [2021-05-22 01:39:46,282 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [924871052] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:39:46,282 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [729116202] [2021-05-22 01:39:46,282 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 87 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 87 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:39:46,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:39:46,303 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-22 01:39:46,303 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:39:46,531 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 2 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:39:46,531 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [729116202] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:39:46,532 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:39:46,532 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 14] total 23 [2021-05-22 01:39:46,532 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1025479761] [2021-05-22 01:39:46,532 INFO L462 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-22 01:39:46,532 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:39:46,532 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-22 01:39:46,532 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=511, Unknown=0, NotChecked=0, Total=600 [2021-05-22 01:39:46,532 INFO L87 Difference]: Start difference. First operand 6409 states and 22556 transitions. Second operand has 25 states, 24 states have (on average 1.7083333333333333) internal successors, (41), 24 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:39:53,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:39:53,813 INFO L93 Difference]: Finished difference Result 74180 states and 234629 transitions. [2021-05-22 01:39:53,813 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 256 states. [2021-05-22 01:39:53,813 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 1.7083333333333333) internal successors, (41), 24 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-05-22 01:39:53,813 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:39:53,979 INFO L225 Difference]: With dead ends: 74180 [2021-05-22 01:39:53,979 INFO L226 Difference]: Without dead ends: 70962 [2021-05-22 01:39:53,981 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 286 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 274 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32527 ImplicationChecksByTransitivity, 4619.2ms TimeCoverageRelationStatistics Valid=9287, Invalid=66613, Unknown=0, NotChecked=0, Total=75900 [2021-05-22 01:39:54,211 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70962 states. [2021-05-22 01:39:54,545 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70962 to 6153. [2021-05-22 01:39:54,552 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6153 states, 6123 states have (on average 3.5118406010125756) internal successors, (21503), 6152 states have internal predecessors, (21503), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:39:54,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6153 states to 6153 states and 21503 transitions. [2021-05-22 01:39:54,565 INFO L78 Accepts]: Start accepts. Automaton has 6153 states and 21503 transitions. Word has length 22 [2021-05-22 01:39:54,565 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:39:54,565 INFO L482 AbstractCegarLoop]: Abstraction has 6153 states and 21503 transitions. [2021-05-22 01:39:54,565 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 25 states, 24 states have (on average 1.7083333333333333) internal successors, (41), 24 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:39:54,565 INFO L276 IsEmpty]: Start isEmpty. Operand 6153 states and 21503 transitions. [2021-05-22 01:39:54,568 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-22 01:39:54,568 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:39:54,568 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:39:54,768 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable92,87 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:39:54,769 INFO L430 AbstractCegarLoop]: === Iteration 48 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:39:54,769 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:39:54,769 INFO L82 PathProgramCache]: Analyzing trace with hash -1492861591, now seen corresponding path program 8 times [2021-05-22 01:39:54,769 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:39:54,769 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [563751459] [2021-05-22 01:39:54,769 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:39:54,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:39:54,823 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-22 01:39:54,823 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:39:54,823 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [563751459] [2021-05-22 01:39:54,823 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [563751459] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:39:54,823 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1577659988] [2021-05-22 01:39:54,824 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 88 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 88 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:39:54,844 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 01:39:54,844 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 01:39:54,845 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-22 01:39:54,845 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:39:55,016 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 4 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:39:55,017 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1577659988] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:39:55,017 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:39:55,017 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 14] total 24 [2021-05-22 01:39:55,017 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1747409577] [2021-05-22 01:39:55,017 INFO L462 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-22 01:39:55,017 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:39:55,017 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-22 01:39:55,017 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=554, Unknown=0, NotChecked=0, Total=650 [2021-05-22 01:39:55,017 INFO L87 Difference]: Start difference. First operand 6153 states and 21503 transitions. Second operand has 26 states, 25 states have (on average 1.64) internal successors, (41), 25 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:40:00,987 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:40:00,987 INFO L93 Difference]: Finished difference Result 70906 states and 226222 transitions. [2021-05-22 01:40:00,988 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 231 states. [2021-05-22 01:40:00,988 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 1.64) internal successors, (41), 25 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-05-22 01:40:00,988 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:40:01,148 INFO L225 Difference]: With dead ends: 70906 [2021-05-22 01:40:01,148 INFO L226 Difference]: Without dead ends: 68989 [2021-05-22 01:40:01,151 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 261 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 250 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26838 ImplicationChecksByTransitivity, 3543.5ms TimeCoverageRelationStatistics Valid=7791, Invalid=55461, Unknown=0, NotChecked=0, Total=63252 [2021-05-22 01:40:01,375 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68989 states. [2021-05-22 01:40:01,741 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68989 to 5660. [2021-05-22 01:40:01,747 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5660 states, 5630 states have (on average 3.5065719360568384) internal successors, (19742), 5659 states have internal predecessors, (19742), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:40:01,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5660 states to 5660 states and 19742 transitions. [2021-05-22 01:40:01,759 INFO L78 Accepts]: Start accepts. Automaton has 5660 states and 19742 transitions. Word has length 22 [2021-05-22 01:40:01,759 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:40:01,760 INFO L482 AbstractCegarLoop]: Abstraction has 5660 states and 19742 transitions. [2021-05-22 01:40:01,760 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 26 states, 25 states have (on average 1.64) internal successors, (41), 25 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:40:01,760 INFO L276 IsEmpty]: Start isEmpty. Operand 5660 states and 19742 transitions. [2021-05-22 01:40:01,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-22 01:40:01,763 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:40:01,763 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:40:01,983 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable93,88 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:40:01,983 INFO L430 AbstractCegarLoop]: === Iteration 49 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:40:01,983 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:40:01,983 INFO L82 PathProgramCache]: Analyzing trace with hash 1087181421, now seen corresponding path program 9 times [2021-05-22 01:40:01,984 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:40:01,984 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1998665633] [2021-05-22 01:40:01,984 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:40:01,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:40:02,032 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 4 proven. 7 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-22 01:40:02,033 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:40:02,033 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1998665633] [2021-05-22 01:40:02,033 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1998665633] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:40:02,033 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1364089744] [2021-05-22 01:40:02,033 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 89 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 89 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:40:02,083 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-22 01:40:02,083 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 01:40:02,084 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-22 01:40:02,084 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:40:02,252 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 2 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:40:02,252 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1364089744] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:40:02,252 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:40:02,252 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 14] total 23 [2021-05-22 01:40:02,252 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [584546661] [2021-05-22 01:40:02,252 INFO L462 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-22 01:40:02,252 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:40:02,253 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-22 01:40:02,253 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=509, Unknown=0, NotChecked=0, Total=600 [2021-05-22 01:40:02,253 INFO L87 Difference]: Start difference. First operand 5660 states and 19742 transitions. Second operand has 25 states, 24 states have (on average 1.7083333333333333) internal successors, (41), 24 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:40:07,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:40:07,907 INFO L93 Difference]: Finished difference Result 57693 states and 183080 transitions. [2021-05-22 01:40:07,907 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 211 states. [2021-05-22 01:40:07,907 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 1.7083333333333333) internal successors, (41), 24 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-05-22 01:40:07,907 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:40:08,044 INFO L225 Difference]: With dead ends: 57693 [2021-05-22 01:40:08,044 INFO L226 Difference]: Without dead ends: 55111 [2021-05-22 01:40:08,046 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 241 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 229 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22392 ImplicationChecksByTransitivity, 3507.6ms TimeCoverageRelationStatistics Valid=6935, Invalid=46195, Unknown=0, NotChecked=0, Total=53130 [2021-05-22 01:40:08,234 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55111 states. [2021-05-22 01:40:08,525 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55111 to 5609. [2021-05-22 01:40:08,531 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5609 states, 5579 states have (on average 3.494891557626815) internal successors, (19498), 5608 states have internal predecessors, (19498), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:40:08,542 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5609 states to 5609 states and 19498 transitions. [2021-05-22 01:40:08,543 INFO L78 Accepts]: Start accepts. Automaton has 5609 states and 19498 transitions. Word has length 22 [2021-05-22 01:40:08,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:40:08,543 INFO L482 AbstractCegarLoop]: Abstraction has 5609 states and 19498 transitions. [2021-05-22 01:40:08,543 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 25 states, 24 states have (on average 1.7083333333333333) internal successors, (41), 24 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:40:08,543 INFO L276 IsEmpty]: Start isEmpty. Operand 5609 states and 19498 transitions. [2021-05-22 01:40:08,546 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-22 01:40:08,546 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:40:08,546 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:40:08,746 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable94,89 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:40:08,746 INFO L430 AbstractCegarLoop]: === Iteration 50 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:40:08,746 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:40:08,746 INFO L82 PathProgramCache]: Analyzing trace with hash -470700853, now seen corresponding path program 10 times [2021-05-22 01:40:08,746 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:40:08,747 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1172844010] [2021-05-22 01:40:08,747 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:40:08,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:40:08,796 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-22 01:40:08,797 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:40:08,797 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1172844010] [2021-05-22 01:40:08,797 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1172844010] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:40:08,797 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1169012535] [2021-05-22 01:40:08,797 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 90 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 90 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:40:08,817 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 01:40:08,817 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 01:40:08,818 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-22 01:40:08,818 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:40:08,984 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 2 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:40:08,984 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1169012535] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:40:08,984 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:40:08,984 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 14] total 23 [2021-05-22 01:40:08,984 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2147130043] [2021-05-22 01:40:08,984 INFO L462 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-22 01:40:08,984 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:40:08,984 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-22 01:40:08,984 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=514, Unknown=0, NotChecked=0, Total=600 [2021-05-22 01:40:08,985 INFO L87 Difference]: Start difference. First operand 5609 states and 19498 transitions. Second operand has 25 states, 24 states have (on average 1.6666666666666667) internal successors, (40), 24 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) [2021-05-22 01:40:13,578 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:40:13,578 INFO L93 Difference]: Finished difference Result 55954 states and 178893 transitions. [2021-05-22 01:40:13,579 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 184 states. [2021-05-22 01:40:13,579 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 1.6666666666666667) internal successors, (40), 24 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) Word has length 22 [2021-05-22 01:40:13,579 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:40:13,715 INFO L225 Difference]: With dead ends: 55954 [2021-05-22 01:40:13,715 INFO L226 Difference]: Without dead ends: 54044 [2021-05-22 01:40:13,718 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 214 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 202 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16907 ImplicationChecksByTransitivity, 2731.1ms TimeCoverageRelationStatistics Valid=4953, Invalid=36459, Unknown=0, NotChecked=0, Total=41412 [2021-05-22 01:40:13,900 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54044 states. [2021-05-22 01:40:14,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54044 to 5470. [2021-05-22 01:40:14,195 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5470 states, 5440 states have (on average 3.5301470588235295) internal successors, (19204), 5469 states have internal predecessors, (19204), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:40:14,207 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5470 states to 5470 states and 19204 transitions. [2021-05-22 01:40:14,207 INFO L78 Accepts]: Start accepts. Automaton has 5470 states and 19204 transitions. Word has length 22 [2021-05-22 01:40:14,208 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:40:14,208 INFO L482 AbstractCegarLoop]: Abstraction has 5470 states and 19204 transitions. [2021-05-22 01:40:14,208 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 25 states, 24 states have (on average 1.6666666666666667) internal successors, (40), 24 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) [2021-05-22 01:40:14,208 INFO L276 IsEmpty]: Start isEmpty. Operand 5470 states and 19204 transitions. [2021-05-22 01:40:14,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-22 01:40:14,210 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:40:14,210 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:40:14,411 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable95,90 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:40:14,411 INFO L430 AbstractCegarLoop]: === Iteration 51 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:40:14,411 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:40:14,411 INFO L82 PathProgramCache]: Analyzing trace with hash -86651671, now seen corresponding path program 11 times [2021-05-22 01:40:14,412 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:40:14,412 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1510629376] [2021-05-22 01:40:14,412 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:40:14,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:40:14,482 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 9 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-22 01:40:14,482 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:40:14,482 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1510629376] [2021-05-22 01:40:14,482 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1510629376] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:40:14,482 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1799601874] [2021-05-22 01:40:14,482 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 91 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 91 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:40:14,504 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-05-22 01:40:14,505 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 01:40:14,505 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-22 01:40:14,505 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:40:14,681 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 4 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:40:14,681 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1799601874] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:40:14,681 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:40:14,681 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 14] total 25 [2021-05-22 01:40:14,681 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1880799822] [2021-05-22 01:40:14,682 INFO L462 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-22 01:40:14,682 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:40:14,682 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-22 01:40:14,682 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=602, Unknown=0, NotChecked=0, Total=702 [2021-05-22 01:40:14,682 INFO L87 Difference]: Start difference. First operand 5470 states and 19204 transitions. Second operand has 27 states, 26 states have (on average 1.5769230769230769) internal successors, (41), 26 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:40:18,987 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:40:18,987 INFO L93 Difference]: Finished difference Result 47195 states and 151255 transitions. [2021-05-22 01:40:18,987 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 161 states. [2021-05-22 01:40:18,988 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 26 states have (on average 1.5769230769230769) internal successors, (41), 26 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-05-22 01:40:18,988 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:40:19,090 INFO L225 Difference]: With dead ends: 47195 [2021-05-22 01:40:19,091 INFO L226 Difference]: Without dead ends: 45824 [2021-05-22 01:40:19,093 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 182 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13339 ImplicationChecksByTransitivity, 2268.9ms TimeCoverageRelationStatistics Valid=4208, Invalid=29464, Unknown=0, NotChecked=0, Total=33672 [2021-05-22 01:40:19,251 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45824 states. [2021-05-22 01:40:19,488 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45824 to 5419. [2021-05-22 01:40:19,493 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5419 states, 5389 states have (on average 3.5342364074967527) internal successors, (19046), 5418 states have internal predecessors, (19046), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:40:19,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5419 states to 5419 states and 19046 transitions. [2021-05-22 01:40:19,505 INFO L78 Accepts]: Start accepts. Automaton has 5419 states and 19046 transitions. Word has length 22 [2021-05-22 01:40:19,505 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:40:19,505 INFO L482 AbstractCegarLoop]: Abstraction has 5419 states and 19046 transitions. [2021-05-22 01:40:19,505 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 27 states, 26 states have (on average 1.5769230769230769) internal successors, (41), 26 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:40:19,505 INFO L276 IsEmpty]: Start isEmpty. Operand 5419 states and 19046 transitions. [2021-05-22 01:40:19,508 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-22 01:40:19,508 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:40:19,508 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:40:19,708 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable96,91 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:40:19,708 INFO L430 AbstractCegarLoop]: === Iteration 52 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:40:19,708 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:40:19,708 INFO L82 PathProgramCache]: Analyzing trace with hash -81890071, now seen corresponding path program 12 times [2021-05-22 01:40:19,709 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:40:19,709 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1601691352] [2021-05-22 01:40:19,709 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:40:19,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:40:19,776 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 9 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-22 01:40:19,776 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:40:19,776 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1601691352] [2021-05-22 01:40:19,777 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1601691352] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:40:19,777 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [280954752] [2021-05-22 01:40:19,777 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 92 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 92 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:40:19,797 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-05-22 01:40:19,798 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 01:40:19,798 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-22 01:40:19,798 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:40:19,974 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 4 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:40:19,974 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [280954752] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:40:19,974 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:40:19,974 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 14] total 25 [2021-05-22 01:40:19,974 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1513779625] [2021-05-22 01:40:19,975 INFO L462 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-22 01:40:19,975 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:40:19,975 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-22 01:40:19,975 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=602, Unknown=0, NotChecked=0, Total=702 [2021-05-22 01:40:19,975 INFO L87 Difference]: Start difference. First operand 5419 states and 19046 transitions. Second operand has 27 states, 26 states have (on average 1.5769230769230769) internal successors, (41), 26 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:40:22,565 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:40:22,565 INFO L93 Difference]: Finished difference Result 28103 states and 91207 transitions. [2021-05-22 01:40:22,565 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2021-05-22 01:40:22,565 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 26 states have (on average 1.5769230769230769) internal successors, (41), 26 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-05-22 01:40:22,565 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:40:22,621 INFO L225 Difference]: With dead ends: 28103 [2021-05-22 01:40:22,622 INFO L226 Difference]: Without dead ends: 26957 [2021-05-22 01:40:22,623 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 121 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5221 ImplicationChecksByTransitivity, 1395.9ms TimeCoverageRelationStatistics Valid=2119, Invalid=12887, Unknown=0, NotChecked=0, Total=15006 [2021-05-22 01:40:22,718 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26957 states. [2021-05-22 01:40:22,865 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26957 to 5236. [2021-05-22 01:40:22,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5236 states, 5206 states have (on average 3.546868997310795) internal successors, (18465), 5235 states have internal predecessors, (18465), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:40:22,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5236 states to 5236 states and 18465 transitions. [2021-05-22 01:40:22,882 INFO L78 Accepts]: Start accepts. Automaton has 5236 states and 18465 transitions. Word has length 22 [2021-05-22 01:40:22,882 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:40:22,882 INFO L482 AbstractCegarLoop]: Abstraction has 5236 states and 18465 transitions. [2021-05-22 01:40:22,882 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 27 states, 26 states have (on average 1.5769230769230769) internal successors, (41), 26 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:40:22,882 INFO L276 IsEmpty]: Start isEmpty. Operand 5236 states and 18465 transitions. [2021-05-22 01:40:22,884 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-22 01:40:22,884 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:40:22,884 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:40:23,085 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 92 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable97 [2021-05-22 01:40:23,085 INFO L430 AbstractCegarLoop]: === Iteration 53 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:40:23,085 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:40:23,085 INFO L82 PathProgramCache]: Analyzing trace with hash 551531471, now seen corresponding path program 13 times [2021-05-22 01:40:23,085 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:40:23,085 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1849826671] [2021-05-22 01:40:23,086 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:40:23,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:40:23,171 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-22 01:40:23,171 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:40:23,171 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1849826671] [2021-05-22 01:40:23,172 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1849826671] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:40:23,172 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1027774572] [2021-05-22 01:40:23,173 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 93 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 93 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:40:23,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:40:23,205 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-22 01:40:23,206 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:40:23,376 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:40:23,376 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1027774572] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:40:23,376 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:40:23,376 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 14] total 24 [2021-05-22 01:40:23,376 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [582573509] [2021-05-22 01:40:23,376 INFO L462 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-22 01:40:23,376 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:40:23,377 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-22 01:40:23,377 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=549, Unknown=0, NotChecked=0, Total=650 [2021-05-22 01:40:23,377 INFO L87 Difference]: Start difference. First operand 5236 states and 18465 transitions. Second operand has 26 states, 25 states have (on average 1.72) internal successors, (43), 25 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:40:26,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:40:26,694 INFO L93 Difference]: Finished difference Result 31086 states and 98284 transitions. [2021-05-22 01:40:26,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 121 states. [2021-05-22 01:40:26,694 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 1.72) internal successors, (43), 25 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-05-22 01:40:26,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:40:26,757 INFO L225 Difference]: With dead ends: 31086 [2021-05-22 01:40:26,757 INFO L226 Difference]: Without dead ends: 28949 [2021-05-22 01:40:26,759 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 141 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7469 ImplicationChecksByTransitivity, 1933.0ms TimeCoverageRelationStatistics Valid=3212, Invalid=17094, Unknown=0, NotChecked=0, Total=20306 [2021-05-22 01:40:26,865 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28949 states. [2021-05-22 01:40:27,037 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28949 to 5023. [2021-05-22 01:40:27,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5023 states, 4993 states have (on average 3.523733226517124) internal successors, (17594), 5022 states have internal predecessors, (17594), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:40:27,054 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5023 states to 5023 states and 17594 transitions. [2021-05-22 01:40:27,054 INFO L78 Accepts]: Start accepts. Automaton has 5023 states and 17594 transitions. Word has length 22 [2021-05-22 01:40:27,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:40:27,054 INFO L482 AbstractCegarLoop]: Abstraction has 5023 states and 17594 transitions. [2021-05-22 01:40:27,054 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 26 states, 25 states have (on average 1.72) internal successors, (43), 25 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:40:27,054 INFO L276 IsEmpty]: Start isEmpty. Operand 5023 states and 17594 transitions. [2021-05-22 01:40:27,056 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-22 01:40:27,056 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:40:27,056 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:40:27,256 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable98,93 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:40:27,257 INFO L430 AbstractCegarLoop]: === Iteration 54 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:40:27,257 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:40:27,257 INFO L82 PathProgramCache]: Analyzing trace with hash -1006350803, now seen corresponding path program 14 times [2021-05-22 01:40:27,257 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:40:27,257 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [99805847] [2021-05-22 01:40:27,257 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:40:27,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:40:27,319 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 8 proven. 5 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-22 01:40:27,319 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:40:27,319 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [99805847] [2021-05-22 01:40:27,319 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [99805847] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:40:27,320 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1110579953] [2021-05-22 01:40:27,320 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 94 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 94 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:40:27,341 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 01:40:27,341 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 01:40:27,342 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-22 01:40:27,342 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:40:27,532 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:40:27,533 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1110579953] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:40:27,533 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:40:27,533 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 14] total 24 [2021-05-22 01:40:27,533 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1686941086] [2021-05-22 01:40:27,533 INFO L462 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-22 01:40:27,533 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:40:27,534 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-22 01:40:27,534 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=556, Unknown=0, NotChecked=0, Total=650 [2021-05-22 01:40:27,534 INFO L87 Difference]: Start difference. First operand 5023 states and 17594 transitions. Second operand has 26 states, 25 states have (on average 1.68) internal successors, (42), 25 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:40:29,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:40:29,875 INFO L93 Difference]: Finished difference Result 29362 states and 93568 transitions. [2021-05-22 01:40:29,875 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 95 states. [2021-05-22 01:40:29,876 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 1.68) internal successors, (42), 25 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-05-22 01:40:29,876 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:40:29,937 INFO L225 Difference]: With dead ends: 29362 [2021-05-22 01:40:29,937 INFO L226 Difference]: Without dead ends: 28195 [2021-05-22 01:40:29,938 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4650 ImplicationChecksByTransitivity, 1437.7ms TimeCoverageRelationStatistics Valid=2128, Invalid=11212, Unknown=0, NotChecked=0, Total=13340 [2021-05-22 01:40:30,038 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28195 states. [2021-05-22 01:40:30,187 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28195 to 4606. [2021-05-22 01:40:30,192 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4606 states, 4576 states have (on average 3.4984702797202796) internal successors, (16009), 4605 states have internal predecessors, (16009), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:40:30,201 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4606 states to 4606 states and 16009 transitions. [2021-05-22 01:40:30,201 INFO L78 Accepts]: Start accepts. Automaton has 4606 states and 16009 transitions. Word has length 22 [2021-05-22 01:40:30,201 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:40:30,201 INFO L482 AbstractCegarLoop]: Abstraction has 4606 states and 16009 transitions. [2021-05-22 01:40:30,201 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 26 states, 25 states have (on average 1.68) internal successors, (42), 25 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:40:30,201 INFO L276 IsEmpty]: Start isEmpty. Operand 4606 states and 16009 transitions. [2021-05-22 01:40:30,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-22 01:40:30,204 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:40:30,204 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:40:30,416 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 94 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable99 [2021-05-22 01:40:30,417 INFO L430 AbstractCegarLoop]: === Iteration 55 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:40:30,417 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:40:30,417 INFO L82 PathProgramCache]: Analyzing trace with hash -2046862385, now seen corresponding path program 15 times [2021-05-22 01:40:30,417 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:40:30,417 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1042377896] [2021-05-22 01:40:30,417 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:40:30,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:40:30,478 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-22 01:40:30,478 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:40:30,478 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1042377896] [2021-05-22 01:40:30,479 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1042377896] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:40:30,479 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [999315435] [2021-05-22 01:40:30,479 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 95 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 95 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:40:30,512 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-22 01:40:30,512 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 01:40:30,512 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-22 01:40:30,513 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:40:30,725 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:40:30,725 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [999315435] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:40:30,725 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:40:30,725 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 14] total 24 [2021-05-22 01:40:30,726 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1039777347] [2021-05-22 01:40:30,726 INFO L462 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-22 01:40:30,726 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:40:30,726 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-22 01:40:30,726 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=549, Unknown=0, NotChecked=0, Total=650 [2021-05-22 01:40:30,726 INFO L87 Difference]: Start difference. First operand 4606 states and 16009 transitions. Second operand has 26 states, 25 states have (on average 1.72) internal successors, (43), 25 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:40:33,104 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:40:33,104 INFO L93 Difference]: Finished difference Result 22243 states and 70230 transitions. [2021-05-22 01:40:33,105 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2021-05-22 01:40:33,105 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 1.72) internal successors, (43), 25 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-05-22 01:40:33,105 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:40:33,149 INFO L225 Difference]: With dead ends: 22243 [2021-05-22 01:40:33,149 INFO L226 Difference]: Without dead ends: 20872 [2021-05-22 01:40:33,150 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3815 ImplicationChecksByTransitivity, 1476.0ms TimeCoverageRelationStatistics Valid=1927, Invalid=9629, Unknown=0, NotChecked=0, Total=11556 [2021-05-22 01:40:33,242 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20872 states. [2021-05-22 01:40:33,377 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20872 to 4111. [2021-05-22 01:40:33,381 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4111 states, 4081 states have (on average 3.51114922813036) internal successors, (14329), 4110 states have internal predecessors, (14329), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:40:33,391 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4111 states to 4111 states and 14329 transitions. [2021-05-22 01:40:33,391 INFO L78 Accepts]: Start accepts. Automaton has 4111 states and 14329 transitions. Word has length 22 [2021-05-22 01:40:33,391 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:40:33,391 INFO L482 AbstractCegarLoop]: Abstraction has 4111 states and 14329 transitions. [2021-05-22 01:40:33,391 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 26 states, 25 states have (on average 1.72) internal successors, (43), 25 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:40:33,391 INFO L276 IsEmpty]: Start isEmpty. Operand 4111 states and 14329 transitions. [2021-05-22 01:40:33,393 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-22 01:40:33,393 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:40:33,393 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:40:33,596 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable100,95 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:40:33,596 INFO L430 AbstractCegarLoop]: === Iteration 56 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:40:33,596 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:40:33,596 INFO L82 PathProgramCache]: Analyzing trace with hash 423559405, now seen corresponding path program 16 times [2021-05-22 01:40:33,596 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:40:33,596 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [882754376] [2021-05-22 01:40:33,597 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:40:33,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:40:33,661 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 8 proven. 5 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-22 01:40:33,661 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:40:33,661 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [882754376] [2021-05-22 01:40:33,661 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [882754376] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:40:33,661 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1869275026] [2021-05-22 01:40:33,661 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 96 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 96 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:40:33,682 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 01:40:33,682 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 01:40:33,683 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-22 01:40:33,683 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:40:33,875 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:40:33,876 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1869275026] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:40:33,876 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:40:33,876 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 14] total 24 [2021-05-22 01:40:33,876 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1055490746] [2021-05-22 01:40:33,876 INFO L462 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-22 01:40:33,876 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:40:33,876 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-22 01:40:33,876 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=556, Unknown=0, NotChecked=0, Total=650 [2021-05-22 01:40:33,876 INFO L87 Difference]: Start difference. First operand 4111 states and 14329 transitions. Second operand has 26 states, 25 states have (on average 1.68) internal successors, (42), 25 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:40:36,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:40:36,019 INFO L93 Difference]: Finished difference Result 21549 states and 68185 transitions. [2021-05-22 01:40:36,019 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 88 states. [2021-05-22 01:40:36,020 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 1.68) internal successors, (42), 25 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-05-22 01:40:36,020 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:40:36,063 INFO L225 Difference]: With dead ends: 21549 [2021-05-22 01:40:36,063 INFO L226 Difference]: Without dead ends: 20229 [2021-05-22 01:40:36,064 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4099 ImplicationChecksByTransitivity, 1338.3ms TimeCoverageRelationStatistics Valid=1956, Invalid=10034, Unknown=0, NotChecked=0, Total=11990 [2021-05-22 01:40:36,155 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20229 states. [2021-05-22 01:40:36,279 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20229 to 3712. [2021-05-22 01:40:36,283 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3712 states, 3682 states have (on average 3.4782726778924498) internal successors, (12807), 3711 states have internal predecessors, (12807), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:40:36,291 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3712 states to 3712 states and 12807 transitions. [2021-05-22 01:40:36,291 INFO L78 Accepts]: Start accepts. Automaton has 3712 states and 12807 transitions. Word has length 22 [2021-05-22 01:40:36,291 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 01:40:36,291 INFO L482 AbstractCegarLoop]: Abstraction has 3712 states and 12807 transitions. [2021-05-22 01:40:36,292 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 26 states, 25 states have (on average 1.68) internal successors, (42), 25 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:40:36,292 INFO L276 IsEmpty]: Start isEmpty. Operand 3712 states and 12807 transitions. [2021-05-22 01:40:36,293 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-22 01:40:36,293 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 01:40:36,293 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 01:40:36,493 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 96 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable101 [2021-05-22 01:40:36,493 INFO L430 AbstractCegarLoop]: === Iteration 57 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 01:40:36,494 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 01:40:36,494 INFO L82 PathProgramCache]: Analyzing trace with hash -2047925301, now seen corresponding path program 17 times [2021-05-22 01:40:36,494 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 01:40:36,494 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1387824166] [2021-05-22 01:40:36,494 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 01:40:36,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 01:40:36,567 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 10 proven. 3 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-22 01:40:36,567 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 01:40:36,567 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1387824166] [2021-05-22 01:40:36,567 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1387824166] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:40:36,567 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [25700929] [2021-05-22 01:40:36,567 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 97 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 97 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 01:40:36,588 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-05-22 01:40:36,589 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 01:40:36,589 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-22 01:40:36,589 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 01:40:36,811 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 01:40:36,811 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [25700929] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 01:40:36,811 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 01:40:36,811 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 14] total 25 [2021-05-22 01:40:36,811 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1375775552] [2021-05-22 01:40:36,811 INFO L462 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-22 01:40:36,811 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 01:40:36,811 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-22 01:40:36,812 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=600, Unknown=0, NotChecked=0, Total=702 [2021-05-22 01:40:36,812 INFO L87 Difference]: Start difference. First operand 3712 states and 12807 transitions. Second operand has 27 states, 26 states have (on average 1.6153846153846154) internal successors, (42), 26 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 01:40:38,935 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 01:40:38,935 INFO L93 Difference]: Finished difference Result 20673 states and 65027 transitions. [2021-05-22 01:40:38,936 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 87 states. [2021-05-22 01:40:38,936 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 26 states have (on average 1.6153846153846154) internal successors, (42), 26 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-05-22 01:40:38,936 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 01:40:38,977 INFO L225 Difference]: With dead ends: 20673 [2021-05-22 01:40:38,977 INFO L226 Difference]: Without dead ends: 19548 [2021-05-22 01:40:38,978 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4125 ImplicationChecksByTransitivity, 1389.1ms TimeCoverageRelationStatistics Valid=1978, Invalid=10012, Unknown=0, NotChecked=0, Total=11990 [2021-05-22 01:40:39,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19548 states.