/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-29289db [2021-06-05 13:06:46,354 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-06-05 13:06:46,355 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-06-05 13:06:46,388 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-06-05 13:06:46,403 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-06-05 13:06:46,404 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-06-05 13:06:46,405 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-06-05 13:06:46,406 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-06-05 13:06:46,408 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-06-05 13:06:46,409 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-06-05 13:06:46,410 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-06-05 13:06:46,417 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-06-05 13:06:46,418 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-06-05 13:06:46,422 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-06-05 13:06:46,423 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-06-05 13:06:46,424 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-06-05 13:06:46,429 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-06-05 13:06:46,447 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-06-05 13:06:46,447 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-06-05 13:06:46,448 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-06-05 13:06:46,451 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 [2021-06-05 13:06:46,479 INFO L113 SettingsManager]: Loading preferences was successful [2021-06-05 13:06:46,479 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-06-05 13:06:46,480 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-06-05 13:06:46,480 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-06-05 13:06:46,482 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-06-05 13:06:46,482 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-06-05 13:06:46,482 INFO L138 SettingsManager]: * Use SBE=true [2021-06-05 13:06:46,482 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-06-05 13:06:46,483 INFO L138 SettingsManager]: * sizeof long=4 [2021-06-05 13:06:46,483 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-06-05 13:06:46,483 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-06-05 13:06:46,483 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-06-05 13:06:46,483 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-06-05 13:06:46,484 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-06-05 13:06:46,484 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-06-05 13:06:46,484 INFO L138 SettingsManager]: * sizeof long double=12 [2021-06-05 13:06:46,484 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-06-05 13:06:46,484 INFO L138 SettingsManager]: * Use constant arrays=true [2021-06-05 13:06:46,484 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-06-05 13:06:46,484 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-06-05 13:06:46,484 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-06-05 13:06:46,484 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-06-05 13:06:46,485 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-06-05 13:06:46,485 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-06-05 13:06:46,485 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-06-05 13:06:46,485 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-06-05 13:06:46,485 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-06-05 13:06:46,485 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-06-05 13:06:46,485 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-06-05 13:06:46,485 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-06-05 13:06:46,485 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-06-05 13:06:46,485 INFO L138 SettingsManager]: * Check the insufficient thread errors last=true [2021-06-05 13:06:46,486 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-06-05 13:06:46,749 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-06-05 13:06:46,764 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-06-05 13:06:46,765 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-06-05 13:06:46,766 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2021-06-05 13:06:46,774 INFO L275 PluginConnector]: Boogie PL CUP Parser initialized [2021-06-05 13:06:46,775 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/pthread_nondet_loop_bound.bpl [2021-06-05 13:06:46,775 INFO L110 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/pthread_nondet_loop_bound.bpl' [2021-06-05 13:06:46,803 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-06-05 13:06:46,804 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-06-05 13:06:46,805 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-06-05 13:06:46,805 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-06-05 13:06:46,805 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-06-05 13:06:46,822 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 05.06 01:06:46" (1/1) ... [2021-06-05 13:06:46,826 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 05.06 01:06:46" (1/1) ... [2021-06-05 13:06:46,832 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-06-05 13:06:46,833 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-06-05 13:06:46,833 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-06-05 13:06:46,833 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-06-05 13:06:46,838 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 05.06 01:06:46" (1/1) ... [2021-06-05 13:06:46,838 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 05.06 01:06:46" (1/1) ... [2021-06-05 13:06:46,839 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 05.06 01:06:46" (1/1) ... [2021-06-05 13:06:46,839 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 05.06 01:06:46" (1/1) ... [2021-06-05 13:06:46,840 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 05.06 01:06:46" (1/1) ... [2021-06-05 13:06:46,842 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 05.06 01:06:46" (1/1) ... [2021-06-05 13:06:46,842 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 05.06 01:06:46" (1/1) ... [2021-06-05 13:06:46,843 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-06-05 13:06:46,843 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-06-05 13:06:46,844 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-06-05 13:06:46,844 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-06-05 13:06:46,861 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "pthread_nondet_loop_bound.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 05.06 01:06:46" (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 [2021-06-05 13:06:46,948 INFO L124 BoogieDeclarations]: Specification and implementation of procedure ULTIMATE.start given in one single declaration [2021-06-05 13:06:46,949 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-06-05 13:06:46,949 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-06-05 13:06:46,949 INFO L124 BoogieDeclarations]: Specification and implementation of procedure thread given in one single declaration [2021-06-05 13:06:46,949 INFO L130 BoogieDeclarations]: Found specification of procedure thread [2021-06-05 13:06:46,949 INFO L138 BoogieDeclarations]: Found implementation of procedure thread [2021-06-05 13:06:46,950 WARN L209 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to SingleStatement [2021-06-05 13:06:47,045 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-06-05 13:06:47,045 INFO L299 CfgBuilder]: Removed 0 assume(true) statements. [2021-06-05 13:06:47,046 INFO L202 PluginConnector]: Adding new model pthread_nondet_loop_bound.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 05.06 01:06:47 BoogieIcfgContainer [2021-06-05 13:06:47,046 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-06-05 13:06:47,047 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-06-05 13:06:47,047 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-06-05 13:06:47,049 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-06-05 13:06:47,049 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "pthread_nondet_loop_bound.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 05.06 01:06:46" (1/2) ... [2021-06-05 13:06:47,050 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@343e9cff and model type pthread_nondet_loop_bound.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 05.06 01:06:47, skipping insertion in model container [2021-06-05 13:06:47,050 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 05.06 01:06:47" (2/2) ... [2021-06-05 13:06:47,051 INFO L111 eAbstractionObserver]: Analyzing ICFG pthread_nondet_loop_bound.bpl [2021-06-05 13:06:47,071 WARN L148 ceAbstractionStarter]: Switching off computation of Hoare annotation because input is a concurrent program [2021-06-05 13:06:47,071 INFO L214 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-06-05 13:06:47,071 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-06-05 13:06:47,072 INFO L510 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2021-06-05 13:06:47,097 WARN L313 ript$VariableManager]: TermVariabe threadThread1of1ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-05 13:06:47,097 WARN L313 ript$VariableManager]: TermVariabe threadThread1of1ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-05 13:06:47,097 WARN L313 ript$VariableManager]: TermVariabe threadThread1of1ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-05 13:06:47,097 WARN L313 ript$VariableManager]: TermVariabe threadThread1of1ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-05 13:06:47,099 WARN L313 ript$VariableManager]: TermVariabe threadThread1of1ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-05 13:06:47,102 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-06-05 13:06:47,117 INFO L255 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-06-05 13:06:47,141 INFO L378 AbstractCegarLoop]: Interprodecural is true [2021-06-05 13:06:47,141 INFO L379 AbstractCegarLoop]: Hoare is false [2021-06-05 13:06:47,141 INFO L380 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-06-05 13:06:47,142 INFO L381 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-06-05 13:06:47,147 INFO L382 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-06-05 13:06:47,147 INFO L383 AbstractCegarLoop]: Difference is false [2021-06-05 13:06:47,147 INFO L384 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-06-05 13:06:47,147 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-06-05 13:06:47,157 INFO L100 iNet2FiniteAutomaton]: Start petriNet2FiniteAutomaton. Operand has 16 places, 13 transitions, 31 flow [2021-06-05 13:06:47,176 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) [2021-06-05 13:06:47,178 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) [2021-06-05 13:06:47,182 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-06-05 13:06:47,182 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:06:47,182 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:06:47,183 INFO L430 AbstractCegarLoop]: === Iteration 1 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:06:47,186 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:06:47,186 INFO L82 PathProgramCache]: Analyzing trace with hash 268785362, now seen corresponding path program 1 times [2021-06-05 13:06:47,192 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:06:47,193 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [388085780] [2021-06-05 13:06:47,194 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:06:47,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:06:47,400 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:06:47,401 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:06:47,401 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [388085780] [2021-06-05 13:06:47,401 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [388085780] provided 1 perfect and 0 imperfect interpolant sequences [2021-06-05 13:06:47,402 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-06-05 13:06:47,402 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-06-05 13:06:47,402 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1801517047] [2021-06-05 13:06:47,405 INFO L462 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-06-05 13:06:47,405 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:06:47,413 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-06-05 13:06:47,413 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-06-05 13:06:47,415 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) [2021-06-05 13:06:47,555 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:06:47,555 INFO L93 Difference]: Finished difference Result 42 states and 62 transitions. [2021-06-05 13:06:47,557 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-06-05 13:06:47,558 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 [2021-06-05 13:06:47,558 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:06:47,561 INFO L225 Difference]: With dead ends: 42 [2021-06-05 13:06:47,561 INFO L226 Difference]: Without dead ends: 0 [2021-06-05 13:06:47,564 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 91.4ms TimeCoverageRelationStatistics Valid=47, Invalid=85, Unknown=0, NotChecked=0, Total=132 [2021-06-05 13:06:47,573 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-06-05 13:06:47,576 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-06-05 13:06:47,577 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) [2021-06-05 13:06:47,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-06-05 13:06:47,578 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 7 [2021-06-05 13:06:47,578 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:06:47,578 INFO L482 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-06-05 13:06:47,578 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) [2021-06-05 13:06:47,579 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-06-05 13:06:47,579 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-06-05 13:06:47,579 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-06-05 13:06:47,579 INFO L315 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE (1/2) [2021-06-05 13:06:47,581 INFO L255 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-06-05 13:06:47,585 INFO L378 AbstractCegarLoop]: Interprodecural is true [2021-06-05 13:06:47,585 INFO L379 AbstractCegarLoop]: Hoare is false [2021-06-05 13:06:47,585 INFO L380 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-06-05 13:06:47,585 INFO L381 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-06-05 13:06:47,585 INFO L382 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-06-05 13:06:47,585 INFO L383 AbstractCegarLoop]: Difference is false [2021-06-05 13:06:47,586 INFO L384 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-06-05 13:06:47,586 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == InUseError======== [2021-06-05 13:06:47,587 INFO L100 iNet2FiniteAutomaton]: Start petriNet2FiniteAutomaton. Operand has 16 places, 13 transitions, 31 flow [2021-06-05 13:06:47,591 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) [2021-06-05 13:06:47,592 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) [2021-06-05 13:06:47,592 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-06-05 13:06:47,592 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:06:47,593 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1] [2021-06-05 13:06:47,593 INFO L430 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION]=== [2021-06-05 13:06:47,594 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:06:47,594 INFO L82 PathProgramCache]: Analyzing trace with hash 268777336, now seen corresponding path program 1 times [2021-06-05 13:06:47,594 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:06:47,594 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1634670481] [2021-06-05 13:06:47,594 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:06:47,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-06-05 13:06:47,607 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-06-05 13:06:47,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-06-05 13:06:47,617 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-06-05 13:06:47,628 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-06-05 13:06:47,628 INFO L622 BasicCegarLoop]: Counterexample might be feasible [2021-06-05 13:06:47,629 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-06-05 13:06:47,629 INFO L315 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2021-06-05 13:06:47,629 WARN L242 ceAbstractionStarter]: 1 thread instances were not sufficient, I will increase this number and restart the analysis [2021-06-05 13:06:47,629 INFO L510 ceAbstractionStarter]: Constructing petrified ICFG for 2 thread instances. [2021-06-05 13:06:47,635 WARN L313 ript$VariableManager]: TermVariabe threadThread1of2ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-05 13:06:47,635 WARN L313 ript$VariableManager]: TermVariabe threadThread1of2ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-05 13:06:47,635 WARN L313 ript$VariableManager]: TermVariabe threadThread1of2ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-05 13:06:47,635 WARN L313 ript$VariableManager]: TermVariabe threadThread1of2ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-05 13:06:47,636 WARN L313 ript$VariableManager]: TermVariabe threadThread2of2ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-05 13:06:47,636 WARN L313 ript$VariableManager]: TermVariabe threadThread2of2ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-05 13:06:47,636 WARN L313 ript$VariableManager]: TermVariabe threadThread2of2ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-05 13:06:47,637 WARN L313 ript$VariableManager]: TermVariabe threadThread2of2ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-05 13:06:47,638 WARN L313 ript$VariableManager]: TermVariabe threadThread1of2ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-05 13:06:47,640 WARN L313 ript$VariableManager]: TermVariabe threadThread2of2ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-05 13:06:47,641 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-06-05 13:06:47,642 INFO L255 AbstractCegarLoop]: Starting to check reachability of 3 error locations. [2021-06-05 13:06:47,644 INFO L378 AbstractCegarLoop]: Interprodecural is true [2021-06-05 13:06:47,644 INFO L379 AbstractCegarLoop]: Hoare is false [2021-06-05 13:06:47,644 INFO L380 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-06-05 13:06:47,644 INFO L381 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-06-05 13:06:47,644 INFO L382 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-06-05 13:06:47,644 INFO L383 AbstractCegarLoop]: Difference is false [2021-06-05 13:06:47,644 INFO L384 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-06-05 13:06:47,645 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-06-05 13:06:47,646 INFO L100 iNet2FiniteAutomaton]: Start petriNet2FiniteAutomaton. Operand has 24 places, 19 transitions, 50 flow [2021-06-05 13:06:47,665 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) [2021-06-05 13:06:47,666 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) [2021-06-05 13:06:47,667 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-06-05 13:06:47,667 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:06:47,667 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:06:47,667 INFO L430 AbstractCegarLoop]: === Iteration 1 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:06:47,668 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:06:47,668 INFO L82 PathProgramCache]: Analyzing trace with hash 513720736, now seen corresponding path program 1 times [2021-06-05 13:06:47,668 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:06:47,668 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [175798389] [2021-06-05 13:06:47,668 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:06:47,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:06:47,725 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:06:47,725 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:06:47,727 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [175798389] [2021-06-05 13:06:47,728 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [175798389] provided 1 perfect and 0 imperfect interpolant sequences [2021-06-05 13:06:47,728 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-06-05 13:06:47,728 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-06-05 13:06:47,732 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1091781336] [2021-06-05 13:06:47,732 INFO L462 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-06-05 13:06:47,732 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:06:47,732 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-06-05 13:06:47,733 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-06-05 13:06:47,734 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) [2021-06-05 13:06:47,932 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:06:47,932 INFO L93 Difference]: Finished difference Result 497 states and 1072 transitions. [2021-06-05 13:06:47,933 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-06-05 13:06:47,933 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 [2021-06-05 13:06:47,933 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:06:47,938 INFO L225 Difference]: With dead ends: 497 [2021-06-05 13:06:47,938 INFO L226 Difference]: Without dead ends: 327 [2021-06-05 13:06:47,939 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 95.4ms TimeCoverageRelationStatistics Valid=72, Invalid=138, Unknown=0, NotChecked=0, Total=210 [2021-06-05 13:06:47,943 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 327 states. [2021-06-05 13:06:47,964 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 327 to 217. [2021-06-05 13:06:47,964 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) [2021-06-05 13:06:47,965 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 217 states to 217 states and 490 transitions. [2021-06-05 13:06:47,965 INFO L78 Accepts]: Start accepts. Automaton has 217 states and 490 transitions. Word has length 7 [2021-06-05 13:06:47,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:06:47,965 INFO L482 AbstractCegarLoop]: Abstraction has 217 states and 490 transitions. [2021-06-05 13:06:47,965 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) [2021-06-05 13:06:47,966 INFO L276 IsEmpty]: Start isEmpty. Operand 217 states and 490 transitions. [2021-06-05 13:06:47,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-06-05 13:06:47,966 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:06:47,966 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:06:47,966 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-06-05 13:06:47,966 INFO L430 AbstractCegarLoop]: === Iteration 2 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:06:47,967 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:06:47,967 INFO L82 PathProgramCache]: Analyzing trace with hash 1047128168, now seen corresponding path program 1 times [2021-06-05 13:06:47,967 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:06:47,967 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2072270847] [2021-06-05 13:06:47,967 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:06:47,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:06:48,001 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-06-05 13:06:48,002 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:06:48,002 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2072270847] [2021-06-05 13:06:48,002 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2072270847] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:06:48,002 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1509194734] [2021-06-05 13:06:48,002 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-05 13:06:48,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:06:48,027 INFO L263 TraceCheckSpWp]: Trace formula consists of 19 conjuncts, 7 conjunts are in the unsatisfiable core [2021-06-05 13:06:48,028 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:06:48,142 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:06:48,142 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1509194734] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:06:48,142 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:06:48,143 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6] total 10 [2021-06-05 13:06:48,143 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [87571627] [2021-06-05 13:06:48,144 INFO L462 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-06-05 13:06:48,144 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:06:48,144 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-06-05 13:06:48,144 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2021-06-05 13:06:48,144 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) [2021-06-05 13:06:48,345 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:06:48,345 INFO L93 Difference]: Finished difference Result 344 states and 671 transitions. [2021-06-05 13:06:48,346 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-06-05 13:06:48,346 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 [2021-06-05 13:06:48,346 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:06:48,347 INFO L225 Difference]: With dead ends: 344 [2021-06-05 13:06:48,347 INFO L226 Difference]: Without dead ends: 277 [2021-06-05 13:06:48,348 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 84 ImplicationChecksByTransitivity, 145.0ms TimeCoverageRelationStatistics Valid=149, Invalid=357, Unknown=0, NotChecked=0, Total=506 [2021-06-05 13:06:48,349 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 277 states. [2021-06-05 13:06:48,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 277 to 181. [2021-06-05 13:06:48,357 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) [2021-06-05 13:06:48,358 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 394 transitions. [2021-06-05 13:06:48,358 INFO L78 Accepts]: Start accepts. Automaton has 181 states and 394 transitions. Word has length 10 [2021-06-05 13:06:48,358 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:06:48,358 INFO L482 AbstractCegarLoop]: Abstraction has 181 states and 394 transitions. [2021-06-05 13:06:48,358 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) [2021-06-05 13:06:48,358 INFO L276 IsEmpty]: Start isEmpty. Operand 181 states and 394 transitions. [2021-06-05 13:06:48,359 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-06-05 13:06:48,359 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:06:48,359 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:06:48,578 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-05 13:06:48,578 INFO L430 AbstractCegarLoop]: === Iteration 3 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:06:48,578 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:06:48,579 INFO L82 PathProgramCache]: Analyzing trace with hash 1267816994, now seen corresponding path program 1 times [2021-06-05 13:06:48,579 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:06:48,579 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [265640964] [2021-06-05 13:06:48,579 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:06:48,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:06:48,631 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:06:48,631 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:06:48,631 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [265640964] [2021-06-05 13:06:48,631 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [265640964] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:06:48,631 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1451758460] [2021-06-05 13:06:48,631 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 [2021-06-05 13:06:48,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:06:48,652 INFO L263 TraceCheckSpWp]: Trace formula consists of 23 conjuncts, 9 conjunts are in the unsatisfiable core [2021-06-05 13:06:48,652 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:06:48,792 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:06:48,792 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1451758460] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:06:48,792 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:06:48,792 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 15 [2021-06-05 13:06:48,793 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [302278243] [2021-06-05 13:06:48,793 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-06-05 13:06:48,793 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:06:48,793 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-06-05 13:06:48,793 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=220, Unknown=0, NotChecked=0, Total=272 [2021-06-05 13:06:48,793 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) [2021-06-05 13:06:49,236 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:06:49,236 INFO L93 Difference]: Finished difference Result 393 states and 790 transitions. [2021-06-05 13:06:49,236 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-06-05 13:06:49,236 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 [2021-06-05 13:06:49,236 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:06:49,237 INFO L225 Difference]: With dead ends: 393 [2021-06-05 13:06:49,237 INFO L226 Difference]: Without dead ends: 297 [2021-06-05 13:06:49,238 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 383 ImplicationChecksByTransitivity, 339.9ms TimeCoverageRelationStatistics Valid=402, Invalid=1238, Unknown=0, NotChecked=0, Total=1640 [2021-06-05 13:06:49,239 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 297 states. [2021-06-05 13:06:49,243 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 297 to 127. [2021-06-05 13:06:49,243 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) [2021-06-05 13:06:49,243 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 259 transitions. [2021-06-05 13:06:49,243 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 259 transitions. Word has length 12 [2021-06-05 13:06:49,243 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:06:49,243 INFO L482 AbstractCegarLoop]: Abstraction has 127 states and 259 transitions. [2021-06-05 13:06:49,244 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) [2021-06-05 13:06:49,244 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 259 transitions. [2021-06-05 13:06:49,244 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-06-05 13:06:49,244 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:06:49,244 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:06:49,460 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-05 13:06:49,461 INFO L430 AbstractCegarLoop]: === Iteration 4 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:06:49,461 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:06:49,461 INFO L82 PathProgramCache]: Analyzing trace with hash 1263055394, now seen corresponding path program 2 times [2021-06-05 13:06:49,461 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:06:49,461 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1292211990] [2021-06-05 13:06:49,461 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:06:49,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:06:49,506 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:06:49,507 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:06:49,507 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1292211990] [2021-06-05 13:06:49,507 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1292211990] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:06:49,508 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1801779347] [2021-06-05 13:06:49,508 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 [2021-06-05 13:06:49,529 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-06-05 13:06:49,529 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 13:06:49,530 INFO L263 TraceCheckSpWp]: Trace formula consists of 23 conjuncts, 9 conjunts are in the unsatisfiable core [2021-06-05 13:06:49,530 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:06:49,638 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:06:49,639 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1801779347] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:06:49,639 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:06:49,639 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 15 [2021-06-05 13:06:49,639 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1445387670] [2021-06-05 13:06:49,640 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-06-05 13:06:49,640 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:06:49,640 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-06-05 13:06:49,640 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=220, Unknown=0, NotChecked=0, Total=272 [2021-06-05 13:06:49,640 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) [2021-06-05 13:06:49,948 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:06:49,948 INFO L93 Difference]: Finished difference Result 255 states and 507 transitions. [2021-06-05 13:06:49,950 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-06-05 13:06:49,950 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 [2021-06-05 13:06:49,950 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:06:49,951 INFO L225 Difference]: With dead ends: 255 [2021-06-05 13:06:49,951 INFO L226 Difference]: Without dead ends: 148 [2021-06-05 13:06:49,951 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 167 ImplicationChecksByTransitivity, 220.0ms TimeCoverageRelationStatistics Valid=248, Invalid=682, Unknown=0, NotChecked=0, Total=930 [2021-06-05 13:06:49,952 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2021-06-05 13:06:49,954 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 120. [2021-06-05 13:06:49,954 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) [2021-06-05 13:06:49,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 245 transitions. [2021-06-05 13:06:49,955 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 245 transitions. Word has length 12 [2021-06-05 13:06:49,955 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:06:49,955 INFO L482 AbstractCegarLoop]: Abstraction has 120 states and 245 transitions. [2021-06-05 13:06:49,955 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) [2021-06-05 13:06:49,955 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 245 transitions. [2021-06-05 13:06:49,955 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-06-05 13:06:49,955 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:06:49,956 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:06:50,160 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-05 13:06:50,161 INFO L430 AbstractCegarLoop]: === Iteration 5 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:06:50,161 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:06:50,161 INFO L82 PathProgramCache]: Analyzing trace with hash 1224329442, now seen corresponding path program 3 times [2021-06-05 13:06:50,161 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:06:50,162 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1593136989] [2021-06-05 13:06:50,162 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:06:50,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:06:50,197 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-06-05 13:06:50,197 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:06:50,197 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1593136989] [2021-06-05 13:06:50,197 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1593136989] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:06:50,197 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [50707070] [2021-06-05 13:06:50,197 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 [2021-06-05 13:06:50,226 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-06-05 13:06:50,226 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 13:06:50,226 INFO L263 TraceCheckSpWp]: Trace formula consists of 23 conjuncts, 9 conjunts are in the unsatisfiable core [2021-06-05 13:06:50,227 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:06:50,333 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:06:50,333 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [50707070] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:06:50,333 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:06:50,333 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8] total 14 [2021-06-05 13:06:50,334 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [934006340] [2021-06-05 13:06:50,334 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-06-05 13:06:50,334 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:06:50,334 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-06-05 13:06:50,334 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=193, Unknown=0, NotChecked=0, Total=240 [2021-06-05 13:06:50,334 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) [2021-06-05 13:06:50,630 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:06:50,630 INFO L93 Difference]: Finished difference Result 261 states and 512 transitions. [2021-06-05 13:06:50,630 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-06-05 13:06:50,630 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 [2021-06-05 13:06:50,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:06:50,632 INFO L225 Difference]: With dead ends: 261 [2021-06-05 13:06:50,632 INFO L226 Difference]: Without dead ends: 147 [2021-06-05 13:06:50,633 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 179 ImplicationChecksByTransitivity, 214.6ms TimeCoverageRelationStatistics Valid=270, Invalid=722, Unknown=0, NotChecked=0, Total=992 [2021-06-05 13:06:50,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2021-06-05 13:06:50,636 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 119. [2021-06-05 13:06:50,636 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) [2021-06-05 13:06:50,636 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 243 transitions. [2021-06-05 13:06:50,636 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 243 transitions. Word has length 12 [2021-06-05 13:06:50,636 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:06:50,636 INFO L482 AbstractCegarLoop]: Abstraction has 119 states and 243 transitions. [2021-06-05 13:06:50,636 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) [2021-06-05 13:06:50,637 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 243 transitions. [2021-06-05 13:06:50,637 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-06-05 13:06:50,637 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:06:50,637 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:06:50,847 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-05 13:06:50,848 INFO L430 AbstractCegarLoop]: === Iteration 6 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:06:50,848 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:06:50,848 INFO L82 PathProgramCache]: Analyzing trace with hash -1383215740, now seen corresponding path program 4 times [2021-06-05 13:06:50,848 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:06:50,848 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [400765973] [2021-06-05 13:06:50,848 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:06:50,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:06:50,886 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-06-05 13:06:50,887 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:06:50,887 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [400765973] [2021-06-05 13:06:50,887 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [400765973] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:06:50,887 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1188076772] [2021-06-05 13:06:50,887 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 [2021-06-05 13:06:50,905 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-06-05 13:06:50,905 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 13:06:50,906 INFO L263 TraceCheckSpWp]: Trace formula consists of 23 conjuncts, 9 conjunts are in the unsatisfiable core [2021-06-05 13:06:50,906 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:06:50,984 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:06:50,984 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1188076772] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:06:50,984 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:06:50,984 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8] total 14 [2021-06-05 13:06:50,985 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [437123059] [2021-06-05 13:06:50,985 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-06-05 13:06:50,985 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:06:50,985 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-06-05 13:06:50,985 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-06-05 13:06:50,985 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) [2021-06-05 13:06:51,193 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:06:51,193 INFO L93 Difference]: Finished difference Result 92 states and 165 transitions. [2021-06-05 13:06:51,194 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-06-05 13:06:51,194 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 [2021-06-05 13:06:51,195 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:06:51,195 INFO L225 Difference]: With dead ends: 92 [2021-06-05 13:06:51,195 INFO L226 Difference]: Without dead ends: 0 [2021-06-05 13:06:51,195 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 126 ImplicationChecksByTransitivity, 212.9ms TimeCoverageRelationStatistics Valid=226, Invalid=586, Unknown=0, NotChecked=0, Total=812 [2021-06-05 13:06:51,195 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-06-05 13:06:51,195 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-06-05 13:06:51,195 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) [2021-06-05 13:06:51,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-06-05 13:06:51,195 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 12 [2021-06-05 13:06:51,195 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:06:51,195 INFO L482 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-06-05 13:06:51,196 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) [2021-06-05 13:06:51,196 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-06-05 13:06:51,196 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-06-05 13:06:51,408 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-05 13:06:51,409 INFO L315 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE (1/2) [2021-06-05 13:06:51,409 INFO L255 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-06-05 13:06:51,409 INFO L378 AbstractCegarLoop]: Interprodecural is true [2021-06-05 13:06:51,409 INFO L379 AbstractCegarLoop]: Hoare is false [2021-06-05 13:06:51,410 INFO L380 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-06-05 13:06:51,410 INFO L381 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-06-05 13:06:51,410 INFO L382 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-06-05 13:06:51,410 INFO L383 AbstractCegarLoop]: Difference is false [2021-06-05 13:06:51,410 INFO L384 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-06-05 13:06:51,410 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == InUseError======== [2021-06-05 13:06:51,410 INFO L100 iNet2FiniteAutomaton]: Start petriNet2FiniteAutomaton. Operand has 24 places, 19 transitions, 50 flow [2021-06-05 13:06:51,415 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) [2021-06-05 13:06:51,415 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) [2021-06-05 13:06:51,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-06-05 13:06:51,416 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:06:51,416 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1] [2021-06-05 13:06:51,416 INFO L430 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION]=== [2021-06-05 13:06:51,416 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:06:51,416 INFO L82 PathProgramCache]: Analyzing trace with hash 1047115182, now seen corresponding path program 1 times [2021-06-05 13:06:51,416 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:06:51,416 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [536539288] [2021-06-05 13:06:51,416 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:06:51,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-06-05 13:06:51,419 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-06-05 13:06:51,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-06-05 13:06:51,421 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-06-05 13:06:51,422 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-06-05 13:06:51,422 INFO L622 BasicCegarLoop]: Counterexample might be feasible [2021-06-05 13:06:51,422 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-06-05 13:06:51,422 INFO L315 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2021-06-05 13:06:51,422 WARN L242 ceAbstractionStarter]: 2 thread instances were not sufficient, I will increase this number and restart the analysis [2021-06-05 13:06:51,422 INFO L510 ceAbstractionStarter]: Constructing petrified ICFG for 3 thread instances. [2021-06-05 13:06:51,425 WARN L313 ript$VariableManager]: TermVariabe threadThread3of3ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-05 13:06:51,425 WARN L313 ript$VariableManager]: TermVariabe threadThread3of3ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-05 13:06:51,425 WARN L313 ript$VariableManager]: TermVariabe threadThread3of3ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-05 13:06:51,425 WARN L313 ript$VariableManager]: TermVariabe threadThread3of3ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-05 13:06:51,425 WARN L313 ript$VariableManager]: TermVariabe threadThread2of3ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-05 13:06:51,426 WARN L313 ript$VariableManager]: TermVariabe threadThread2of3ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-05 13:06:51,426 WARN L313 ript$VariableManager]: TermVariabe threadThread2of3ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-05 13:06:51,426 WARN L313 ript$VariableManager]: TermVariabe threadThread2of3ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-05 13:06:51,426 WARN L313 ript$VariableManager]: TermVariabe threadThread1of3ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-05 13:06:51,426 WARN L313 ript$VariableManager]: TermVariabe threadThread1of3ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-05 13:06:51,426 WARN L313 ript$VariableManager]: TermVariabe threadThread1of3ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-05 13:06:51,426 WARN L313 ript$VariableManager]: TermVariabe threadThread1of3ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-05 13:06:51,426 WARN L313 ript$VariableManager]: TermVariabe threadThread1of3ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-05 13:06:51,427 WARN L313 ript$VariableManager]: TermVariabe threadThread2of3ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-05 13:06:51,428 WARN L313 ript$VariableManager]: TermVariabe threadThread3of3ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-05 13:06:51,429 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-06-05 13:06:51,429 INFO L255 AbstractCegarLoop]: Starting to check reachability of 4 error locations. [2021-06-05 13:06:51,429 INFO L378 AbstractCegarLoop]: Interprodecural is true [2021-06-05 13:06:51,429 INFO L379 AbstractCegarLoop]: Hoare is false [2021-06-05 13:06:51,430 INFO L380 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-06-05 13:06:51,430 INFO L381 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-06-05 13:06:51,430 INFO L382 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-06-05 13:06:51,430 INFO L383 AbstractCegarLoop]: Difference is false [2021-06-05 13:06:51,430 INFO L384 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-06-05 13:06:51,430 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-06-05 13:06:51,430 INFO L100 iNet2FiniteAutomaton]: Start petriNet2FiniteAutomaton. Operand has 32 places, 25 transitions, 71 flow [2021-06-05 13:06:51,469 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) [2021-06-05 13:06:51,472 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) [2021-06-05 13:06:51,472 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-06-05 13:06:51,472 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:06:51,472 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:06:51,472 INFO L430 AbstractCegarLoop]: === Iteration 1 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:06:51,473 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:06:51,473 INFO L82 PathProgramCache]: Analyzing trace with hash 1966221566, now seen corresponding path program 1 times [2021-06-05 13:06:51,473 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:06:51,473 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1158727464] [2021-06-05 13:06:51,473 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:06:51,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:06:51,497 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:06:51,497 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:06:51,497 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1158727464] [2021-06-05 13:06:51,497 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1158727464] provided 1 perfect and 0 imperfect interpolant sequences [2021-06-05 13:06:51,497 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-06-05 13:06:51,498 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-06-05 13:06:51,498 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [642035267] [2021-06-05 13:06:51,498 INFO L462 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-06-05 13:06:51,498 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:06:51,498 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-06-05 13:06:51,498 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-06-05 13:06:51,502 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) [2021-06-05 13:06:51,691 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:06:51,691 INFO L93 Difference]: Finished difference Result 4185 states and 12022 transitions. [2021-06-05 13:06:51,691 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-06-05 13:06:51,691 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 [2021-06-05 13:06:51,692 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:06:51,711 INFO L225 Difference]: With dead ends: 4185 [2021-06-05 13:06:51,711 INFO L226 Difference]: Without dead ends: 3603 [2021-06-05 13:06:51,711 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 58.4ms TimeCoverageRelationStatistics Valid=72, Invalid=138, Unknown=0, NotChecked=0, Total=210 [2021-06-05 13:06:51,728 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3603 states. [2021-06-05 13:06:51,776 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3603 to 1891. [2021-06-05 13:06:51,779 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) [2021-06-05 13:06:51,786 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1891 states to 1891 states and 5880 transitions. [2021-06-05 13:06:51,786 INFO L78 Accepts]: Start accepts. Automaton has 1891 states and 5880 transitions. Word has length 7 [2021-06-05 13:06:51,786 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:06:51,786 INFO L482 AbstractCegarLoop]: Abstraction has 1891 states and 5880 transitions. [2021-06-05 13:06:51,786 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) [2021-06-05 13:06:51,786 INFO L276 IsEmpty]: Start isEmpty. Operand 1891 states and 5880 transitions. [2021-06-05 13:06:51,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-06-05 13:06:51,789 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:06:51,789 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:06:51,789 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-06-05 13:06:51,790 INFO L430 AbstractCegarLoop]: === Iteration 2 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:06:51,790 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:06:51,790 INFO L82 PathProgramCache]: Analyzing trace with hash 408196648, now seen corresponding path program 1 times [2021-06-05 13:06:51,790 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:06:51,790 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [392016961] [2021-06-05 13:06:51,790 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:06:51,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:06:51,828 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-06-05 13:06:51,829 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:06:51,829 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [392016961] [2021-06-05 13:06:51,829 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [392016961] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:06:51,829 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1780844491] [2021-06-05 13:06:51,829 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 [2021-06-05 13:06:51,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:06:51,848 INFO L263 TraceCheckSpWp]: Trace formula consists of 19 conjuncts, 7 conjunts are in the unsatisfiable core [2021-06-05 13:06:51,849 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:06:51,905 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:06:51,905 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1780844491] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:06:51,905 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:06:51,906 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6] total 10 [2021-06-05 13:06:51,906 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [809028144] [2021-06-05 13:06:51,906 INFO L462 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-06-05 13:06:51,906 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:06:51,906 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-06-05 13:06:51,906 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2021-06-05 13:06:51,906 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) [2021-06-05 13:06:52,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:06:52,195 INFO L93 Difference]: Finished difference Result 5061 states and 14019 transitions. [2021-06-05 13:06:52,195 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-06-05 13:06:52,195 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 [2021-06-05 13:06:52,195 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:06:52,214 INFO L225 Difference]: With dead ends: 5061 [2021-06-05 13:06:52,214 INFO L226 Difference]: Without dead ends: 4805 [2021-06-05 13:06:52,215 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 84 ImplicationChecksByTransitivity, 111.2ms TimeCoverageRelationStatistics Valid=149, Invalid=357, Unknown=0, NotChecked=0, Total=506 [2021-06-05 13:06:52,248 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4805 states. [2021-06-05 13:06:52,301 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4805 to 2044. [2021-06-05 13:06:52,304 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) [2021-06-05 13:06:52,312 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2044 states to 2044 states and 6319 transitions. [2021-06-05 13:06:52,312 INFO L78 Accepts]: Start accepts. Automaton has 2044 states and 6319 transitions. Word has length 10 [2021-06-05 13:06:52,313 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:06:52,313 INFO L482 AbstractCegarLoop]: Abstraction has 2044 states and 6319 transitions. [2021-06-05 13:06:52,313 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) [2021-06-05 13:06:52,313 INFO L276 IsEmpty]: Start isEmpty. Operand 2044 states and 6319 transitions. [2021-06-05 13:06:52,313 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-06-05 13:06:52,313 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:06:52,313 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:06:52,528 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-05 13:06:52,529 INFO L430 AbstractCegarLoop]: === Iteration 3 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:06:52,529 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:06:52,529 INFO L82 PathProgramCache]: Analyzing trace with hash 1819859788, now seen corresponding path program 1 times [2021-06-05 13:06:52,529 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:06:52,529 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [120732207] [2021-06-05 13:06:52,529 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:06:52,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:06:52,564 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-06-05 13:06:52,565 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:06:52,565 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [120732207] [2021-06-05 13:06:52,565 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [120732207] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:06:52,565 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1731706280] [2021-06-05 13:06:52,565 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) [2021-06-05 13:06:52,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:06:52,587 INFO L263 TraceCheckSpWp]: Trace formula consists of 23 conjuncts, 9 conjunts are in the unsatisfiable core [2021-06-05 13:06:52,587 INFO L286 TraceCheckSpWp]: Computing forward predicates... Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-05 13:06:52,677 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:06:52,677 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1731706280] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:06:52,677 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:06:52,677 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8] total 14 [2021-06-05 13:06:52,677 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [691032240] [2021-06-05 13:06:52,678 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-06-05 13:06:52,678 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:06:52,678 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-06-05 13:06:52,678 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=193, Unknown=0, NotChecked=0, Total=240 [2021-06-05 13:06:52,678 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) [2021-06-05 13:06:53,431 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:06:53,431 INFO L93 Difference]: Finished difference Result 8669 states and 23530 transitions. [2021-06-05 13:06:53,432 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-06-05 13:06:53,432 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 [2021-06-05 13:06:53,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:06:53,475 INFO L225 Difference]: With dead ends: 8669 [2021-06-05 13:06:53,475 INFO L226 Difference]: Without dead ends: 8396 [2021-06-05 13:06:53,476 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 580 ImplicationChecksByTransitivity, 373.0ms TimeCoverageRelationStatistics Valid=561, Invalid=1601, Unknown=0, NotChecked=0, Total=2162 [2021-06-05 13:06:53,505 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8396 states. [2021-06-05 13:06:53,576 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8396 to 2150. [2021-06-05 13:06:53,580 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) [2021-06-05 13:06:53,587 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2150 states to 2150 states and 6662 transitions. [2021-06-05 13:06:53,588 INFO L78 Accepts]: Start accepts. Automaton has 2150 states and 6662 transitions. Word has length 12 [2021-06-05 13:06:53,588 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:06:53,588 INFO L482 AbstractCegarLoop]: Abstraction has 2150 states and 6662 transitions. [2021-06-05 13:06:53,588 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) [2021-06-05 13:06:53,588 INFO L276 IsEmpty]: Start isEmpty. Operand 2150 states and 6662 transitions. [2021-06-05 13:06:53,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-06-05 13:06:53,589 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:06:53,589 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:06:53,805 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-05 13:06:53,806 INFO L430 AbstractCegarLoop]: === Iteration 4 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:06:53,806 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:06:53,806 INFO L82 PathProgramCache]: Analyzing trace with hash 1434960332, now seen corresponding path program 2 times [2021-06-05 13:06:53,806 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:06:53,806 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [839333789] [2021-06-05 13:06:53,806 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:06:53,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:06:53,863 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:06:53,863 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:06:53,863 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [839333789] [2021-06-05 13:06:53,863 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [839333789] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:06:53,863 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1250948551] [2021-06-05 13:06:53,863 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 [2021-06-05 13:06:53,881 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-06-05 13:06:53,882 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 13:06:53,882 INFO L263 TraceCheckSpWp]: Trace formula consists of 23 conjuncts, 9 conjunts are in the unsatisfiable core [2021-06-05 13:06:53,885 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:06:53,983 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:06:53,983 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1250948551] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:06:53,983 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:06:53,983 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 15 [2021-06-05 13:06:53,983 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [359638849] [2021-06-05 13:06:53,983 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-06-05 13:06:53,983 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:06:53,984 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-06-05 13:06:53,984 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=220, Unknown=0, NotChecked=0, Total=272 [2021-06-05 13:06:53,984 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) [2021-06-05 13:06:54,996 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:06:54,996 INFO L93 Difference]: Finished difference Result 10276 states and 27703 transitions. [2021-06-05 13:06:54,996 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-06-05 13:06:54,997 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 [2021-06-05 13:06:54,997 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:06:55,018 INFO L225 Difference]: With dead ends: 10276 [2021-06-05 13:06:55,018 INFO L226 Difference]: Without dead ends: 9902 [2021-06-05 13:06:55,019 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1135 ImplicationChecksByTransitivity, 518.5ms TimeCoverageRelationStatistics Valid=883, Invalid=2657, Unknown=0, NotChecked=0, Total=3540 [2021-06-05 13:06:55,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9902 states. [2021-06-05 13:06:55,120 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9902 to 2061. [2021-06-05 13:06:55,124 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) [2021-06-05 13:06:55,129 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2061 states to 2061 states and 6324 transitions. [2021-06-05 13:06:55,130 INFO L78 Accepts]: Start accepts. Automaton has 2061 states and 6324 transitions. Word has length 12 [2021-06-05 13:06:55,130 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:06:55,130 INFO L482 AbstractCegarLoop]: Abstraction has 2061 states and 6324 transitions. [2021-06-05 13:06:55,130 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) [2021-06-05 13:06:55,130 INFO L276 IsEmpty]: Start isEmpty. Operand 2061 states and 6324 transitions. [2021-06-05 13:06:55,130 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-06-05 13:06:55,130 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:06:55,130 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:06:55,357 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-06-05 13:06:55,358 INFO L430 AbstractCegarLoop]: === Iteration 5 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:06:55,358 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:06:55,358 INFO L82 PathProgramCache]: Analyzing trace with hash 35510376, now seen corresponding path program 3 times [2021-06-05 13:06:55,358 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:06:55,358 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1045353621] [2021-06-05 13:06:55,358 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:06:55,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:06:55,395 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-06-05 13:06:55,395 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:06:55,395 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1045353621] [2021-06-05 13:06:55,395 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1045353621] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:06:55,395 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1676417797] [2021-06-05 13:06:55,395 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 [2021-06-05 13:06:55,414 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-06-05 13:06:55,414 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 13:06:55,415 INFO L263 TraceCheckSpWp]: Trace formula consists of 23 conjuncts, 9 conjunts are in the unsatisfiable core [2021-06-05 13:06:55,415 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:06:55,503 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:06:55,503 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1676417797] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:06:55,503 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:06:55,503 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8] total 14 [2021-06-05 13:06:55,503 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1391074751] [2021-06-05 13:06:55,503 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-06-05 13:06:55,503 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:06:55,504 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-06-05 13:06:55,504 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=194, Unknown=0, NotChecked=0, Total=240 [2021-06-05 13:06:55,504 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) [2021-06-05 13:06:56,194 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:06:56,195 INFO L93 Difference]: Finished difference Result 7635 states and 20327 transitions. [2021-06-05 13:06:56,195 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-06-05 13:06:56,195 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 [2021-06-05 13:06:56,195 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:06:56,232 INFO L225 Difference]: With dead ends: 7635 [2021-06-05 13:06:56,232 INFO L226 Difference]: Without dead ends: 7410 [2021-06-05 13:06:56,233 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 798 ImplicationChecksByTransitivity, 414.1ms TimeCoverageRelationStatistics Valid=667, Invalid=1985, Unknown=0, NotChecked=0, Total=2652 [2021-06-05 13:06:56,260 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7410 states. [2021-06-05 13:06:56,318 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7410 to 2030. [2021-06-05 13:06:56,322 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) [2021-06-05 13:06:56,327 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2030 states to 2030 states and 6211 transitions. [2021-06-05 13:06:56,327 INFO L78 Accepts]: Start accepts. Automaton has 2030 states and 6211 transitions. Word has length 12 [2021-06-05 13:06:56,327 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:06:56,327 INFO L482 AbstractCegarLoop]: Abstraction has 2030 states and 6211 transitions. [2021-06-05 13:06:56,327 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) [2021-06-05 13:06:56,327 INFO L276 IsEmpty]: Start isEmpty. Operand 2030 states and 6211 transitions. [2021-06-05 13:06:56,328 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-06-05 13:06:56,328 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:06:56,328 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:06:56,548 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-05 13:06:56,551 INFO L430 AbstractCegarLoop]: === Iteration 6 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:06:56,551 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:06:56,551 INFO L82 PathProgramCache]: Analyzing trace with hash -825742738, now seen corresponding path program 4 times [2021-06-05 13:06:56,551 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:06:56,552 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1851389995] [2021-06-05 13:06:56,552 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:06:56,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:06:56,587 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-06-05 13:06:56,588 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:06:56,588 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1851389995] [2021-06-05 13:06:56,588 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1851389995] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:06:56,588 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1841036523] [2021-06-05 13:06:56,588 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 [2021-06-05 13:06:56,620 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-06-05 13:06:56,621 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 13:06:56,621 INFO L263 TraceCheckSpWp]: Trace formula consists of 23 conjuncts, 9 conjunts are in the unsatisfiable core [2021-06-05 13:06:56,621 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:06:56,704 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:06:56,704 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1841036523] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:06:56,704 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:06:56,704 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8] total 14 [2021-06-05 13:06:56,704 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [661513323] [2021-06-05 13:06:56,705 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-06-05 13:06:56,705 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:06:56,705 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-06-05 13:06:56,705 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-06-05 13:06:56,705 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) [2021-06-05 13:06:57,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:06:57,689 INFO L93 Difference]: Finished difference Result 8580 states and 22623 transitions. [2021-06-05 13:06:57,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-06-05 13:06:57,689 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 [2021-06-05 13:06:57,689 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:06:57,705 INFO L225 Difference]: With dead ends: 8580 [2021-06-05 13:06:57,705 INFO L226 Difference]: Without dead ends: 8393 [2021-06-05 13:06:57,706 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1453 ImplicationChecksByTransitivity, 575.0ms TimeCoverageRelationStatistics Valid=1000, Invalid=3160, Unknown=0, NotChecked=0, Total=4160 [2021-06-05 13:06:57,728 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8393 states. [2021-06-05 13:06:57,783 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8393 to 1752. [2021-06-05 13:06:57,786 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) [2021-06-05 13:06:57,790 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1752 states to 1752 states and 5352 transitions. [2021-06-05 13:06:57,790 INFO L78 Accepts]: Start accepts. Automaton has 1752 states and 5352 transitions. Word has length 12 [2021-06-05 13:06:57,790 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:06:57,790 INFO L482 AbstractCegarLoop]: Abstraction has 1752 states and 5352 transitions. [2021-06-05 13:06:57,791 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) [2021-06-05 13:06:57,791 INFO L276 IsEmpty]: Start isEmpty. Operand 1752 states and 5352 transitions. [2021-06-05 13:06:57,791 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-06-05 13:06:57,791 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:06:57,791 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:06:58,004 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-06-05 13:06:58,005 INFO L430 AbstractCegarLoop]: === Iteration 7 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:06:58,005 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:06:58,005 INFO L82 PathProgramCache]: Analyzing trace with hash 1147369523, now seen corresponding path program 1 times [2021-06-05 13:06:58,005 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:06:58,005 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [881888410] [2021-06-05 13:06:58,005 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:06:58,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:06:58,032 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-06-05 13:06:58,032 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:06:58,032 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [881888410] [2021-06-05 13:06:58,032 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [881888410] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:06:58,032 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1504746030] [2021-06-05 13:06:58,032 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 [2021-06-05 13:06:58,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:06:58,052 INFO L263 TraceCheckSpWp]: Trace formula consists of 24 conjuncts, 8 conjunts are in the unsatisfiable core [2021-06-05 13:06:58,053 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:06:58,117 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:06:58,117 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1504746030] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:06:58,117 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:06:58,118 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 7] total 11 [2021-06-05 13:06:58,118 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1374668947] [2021-06-05 13:06:58,119 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-06-05 13:06:58,119 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:06:58,119 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-06-05 13:06:58,119 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=117, Unknown=0, NotChecked=0, Total=156 [2021-06-05 13:06:58,119 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) [2021-06-05 13:06:58,388 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:06:58,388 INFO L93 Difference]: Finished difference Result 4301 states and 11979 transitions. [2021-06-05 13:06:58,390 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-06-05 13:06:58,390 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 [2021-06-05 13:06:58,390 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:06:58,397 INFO L225 Difference]: With dead ends: 4301 [2021-06-05 13:06:58,398 INFO L226 Difference]: Without dead ends: 3986 [2021-06-05 13:06:58,398 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 104 ImplicationChecksByTransitivity, 127.0ms TimeCoverageRelationStatistics Valid=172, Invalid=428, Unknown=0, NotChecked=0, Total=600 [2021-06-05 13:06:58,410 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3986 states. [2021-06-05 13:06:58,437 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3986 to 1672. [2021-06-05 13:06:58,439 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) [2021-06-05 13:06:58,442 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1672 states to 1672 states and 5066 transitions. [2021-06-05 13:06:58,442 INFO L78 Accepts]: Start accepts. Automaton has 1672 states and 5066 transitions. Word has length 13 [2021-06-05 13:06:58,443 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:06:58,443 INFO L482 AbstractCegarLoop]: Abstraction has 1672 states and 5066 transitions. [2021-06-05 13:06:58,443 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) [2021-06-05 13:06:58,443 INFO L276 IsEmpty]: Start isEmpty. Operand 1672 states and 5066 transitions. [2021-06-05 13:06:58,444 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-06-05 13:06:58,444 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:06:58,444 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:06:58,644 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-06-05 13:06:58,645 INFO L430 AbstractCegarLoop]: === Iteration 8 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:06:58,645 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:06:58,645 INFO L82 PathProgramCache]: Analyzing trace with hash -315938114, now seen corresponding path program 1 times [2021-06-05 13:06:58,645 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:06:58,645 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1861878208] [2021-06-05 13:06:58,645 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:06:58,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:06:58,674 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-06-05 13:06:58,675 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:06:58,675 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1861878208] [2021-06-05 13:06:58,675 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1861878208] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:06:58,675 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1077212306] [2021-06-05 13:06:58,675 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 [2021-06-05 13:06:58,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:06:58,695 INFO L263 TraceCheckSpWp]: Trace formula consists of 28 conjuncts, 10 conjunts are in the unsatisfiable core [2021-06-05 13:06:58,695 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:06:58,810 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:06:58,810 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1077212306] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:06:58,810 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:06:58,810 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 15 [2021-06-05 13:06:58,810 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1897011650] [2021-06-05 13:06:58,811 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-06-05 13:06:58,811 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:06:58,811 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-06-05 13:06:58,811 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=219, Unknown=0, NotChecked=0, Total=272 [2021-06-05 13:06:58,811 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) [2021-06-05 13:06:59,612 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:06:59,612 INFO L93 Difference]: Finished difference Result 6916 states and 19316 transitions. [2021-06-05 13:06:59,612 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-06-05 13:06:59,612 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 [2021-06-05 13:06:59,612 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:06:59,624 INFO L225 Difference]: With dead ends: 6916 [2021-06-05 13:06:59,625 INFO L226 Difference]: Without dead ends: 6499 [2021-06-05 13:06:59,625 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 622 ImplicationChecksByTransitivity, 406.6ms TimeCoverageRelationStatistics Valid=587, Invalid=1863, Unknown=0, NotChecked=0, Total=2450 [2021-06-05 13:06:59,643 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6499 states. [2021-06-05 13:06:59,707 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6499 to 1889. [2021-06-05 13:06:59,709 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) [2021-06-05 13:06:59,712 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1889 states to 1889 states and 5796 transitions. [2021-06-05 13:06:59,712 INFO L78 Accepts]: Start accepts. Automaton has 1889 states and 5796 transitions. Word has length 15 [2021-06-05 13:06:59,712 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:06:59,712 INFO L482 AbstractCegarLoop]: Abstraction has 1889 states and 5796 transitions. [2021-06-05 13:06:59,712 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) [2021-06-05 13:06:59,713 INFO L276 IsEmpty]: Start isEmpty. Operand 1889 states and 5796 transitions. [2021-06-05 13:06:59,713 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-06-05 13:06:59,713 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:06:59,713 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:06:59,928 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-06-05 13:06:59,929 INFO L430 AbstractCegarLoop]: === Iteration 9 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:06:59,929 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:06:59,929 INFO L82 PathProgramCache]: Analyzing trace with hash -1541673622, now seen corresponding path program 1 times [2021-06-05 13:06:59,929 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:06:59,929 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [82507223] [2021-06-05 13:06:59,929 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:06:59,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:06:59,974 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:06:59,974 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:06:59,974 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [82507223] [2021-06-05 13:06:59,974 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [82507223] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:06:59,974 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1602724729] [2021-06-05 13:06:59,974 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 [2021-06-05 13:06:59,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:06:59,994 INFO L263 TraceCheckSpWp]: Trace formula consists of 28 conjuncts, 10 conjunts are in the unsatisfiable core [2021-06-05 13:06:59,995 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:07:00,096 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:07:00,096 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1602724729] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:07:00,096 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:07:00,096 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 17 [2021-06-05 13:07:00,096 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1379563858] [2021-06-05 13:07:00,096 INFO L462 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-06-05 13:07:00,096 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:07:00,097 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-06-05 13:07:00,097 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=283, Unknown=0, NotChecked=0, Total=342 [2021-06-05 13:07:00,097 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) [2021-06-05 13:07:00,696 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:07:00,696 INFO L93 Difference]: Finished difference Result 6715 states and 19141 transitions. [2021-06-05 13:07:00,696 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-06-05 13:07:00,697 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 [2021-06-05 13:07:00,697 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:07:00,706 INFO L225 Difference]: With dead ends: 6715 [2021-06-05 13:07:00,706 INFO L226 Difference]: Without dead ends: 5971 [2021-06-05 13:07:00,707 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 591 ImplicationChecksByTransitivity, 375.2ms TimeCoverageRelationStatistics Valid=590, Invalid=1860, Unknown=0, NotChecked=0, Total=2450 [2021-06-05 13:07:00,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5971 states. [2021-06-05 13:07:00,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5971 to 1994. [2021-06-05 13:07:00,761 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) [2021-06-05 13:07:00,790 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1994 states to 1994 states and 6082 transitions. [2021-06-05 13:07:00,790 INFO L78 Accepts]: Start accepts. Automaton has 1994 states and 6082 transitions. Word has length 15 [2021-06-05 13:07:00,790 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:07:00,790 INFO L482 AbstractCegarLoop]: Abstraction has 1994 states and 6082 transitions. [2021-06-05 13:07:00,790 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) [2021-06-05 13:07:00,791 INFO L276 IsEmpty]: Start isEmpty. Operand 1994 states and 6082 transitions. [2021-06-05 13:07:00,791 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-06-05 13:07:00,791 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:07:00,791 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:07:00,992 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-06-05 13:07:00,992 INFO L430 AbstractCegarLoop]: === Iteration 10 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:07:00,992 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:07:00,992 INFO L82 PathProgramCache]: Analyzing trace with hash -1184473124, now seen corresponding path program 2 times [2021-06-05 13:07:00,992 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:07:00,993 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1969059801] [2021-06-05 13:07:00,993 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:07:00,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:07:01,033 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:07:01,033 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:07:01,034 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1969059801] [2021-06-05 13:07:01,034 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1969059801] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:07:01,034 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1679905697] [2021-06-05 13:07:01,034 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 [2021-06-05 13:07:01,052 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-06-05 13:07:01,052 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 13:07:01,053 INFO L263 TraceCheckSpWp]: Trace formula consists of 28 conjuncts, 9 conjunts are in the unsatisfiable core [2021-06-05 13:07:01,053 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:07:01,159 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-06-05 13:07:01,159 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1679905697] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:07:01,159 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:07:01,159 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 16 [2021-06-05 13:07:01,159 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1714450426] [2021-06-05 13:07:01,159 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-06-05 13:07:01,159 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:07:01,160 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-06-05 13:07:01,160 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=255, Unknown=0, NotChecked=0, Total=306 [2021-06-05 13:07:01,160 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) [2021-06-05 13:07:01,806 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:07:01,806 INFO L93 Difference]: Finished difference Result 5741 states and 16399 transitions. [2021-06-05 13:07:01,807 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-06-05 13:07:01,807 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 [2021-06-05 13:07:01,807 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:07:01,814 INFO L225 Difference]: With dead ends: 5741 [2021-06-05 13:07:01,814 INFO L226 Difference]: Without dead ends: 5279 [2021-06-05 13:07:01,815 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 350 ImplicationChecksByTransitivity, 351.5ms TimeCoverageRelationStatistics Valid=461, Invalid=1345, Unknown=0, NotChecked=0, Total=1806 [2021-06-05 13:07:01,826 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5279 states. [2021-06-05 13:07:01,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5279 to 1797. [2021-06-05 13:07:01,858 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) [2021-06-05 13:07:01,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1797 states to 1797 states and 5338 transitions. [2021-06-05 13:07:01,861 INFO L78 Accepts]: Start accepts. Automaton has 1797 states and 5338 transitions. Word has length 15 [2021-06-05 13:07:01,861 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:07:01,861 INFO L482 AbstractCegarLoop]: Abstraction has 1797 states and 5338 transitions. [2021-06-05 13:07:01,861 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) [2021-06-05 13:07:01,861 INFO L276 IsEmpty]: Start isEmpty. Operand 1797 states and 5338 transitions. [2021-06-05 13:07:01,862 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-06-05 13:07:01,862 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:07:01,862 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:07:02,076 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-05 13:07:02,077 INFO L430 AbstractCegarLoop]: === Iteration 11 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:07:02,077 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:07:02,077 INFO L82 PathProgramCache]: Analyzing trace with hash -1184478094, now seen corresponding path program 2 times [2021-06-05 13:07:02,077 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:07:02,077 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1233719394] [2021-06-05 13:07:02,077 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:07:02,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:07:02,131 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:07:02,131 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:07:02,131 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1233719394] [2021-06-05 13:07:02,131 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1233719394] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:07:02,132 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [142547542] [2021-06-05 13:07:02,132 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 [2021-06-05 13:07:02,166 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-06-05 13:07:02,166 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 13:07:02,167 INFO L263 TraceCheckSpWp]: Trace formula consists of 28 conjuncts, 9 conjunts are in the unsatisfiable core [2021-06-05 13:07:02,168 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:07:02,268 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-06-05 13:07:02,269 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [142547542] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:07:02,269 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:07:02,269 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 16 [2021-06-05 13:07:02,269 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1205456420] [2021-06-05 13:07:02,270 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-06-05 13:07:02,270 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:07:02,270 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-06-05 13:07:02,271 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=255, Unknown=0, NotChecked=0, Total=306 [2021-06-05 13:07:02,271 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) [2021-06-05 13:07:02,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:07:02,966 INFO L93 Difference]: Finished difference Result 4136 states and 11633 transitions. [2021-06-05 13:07:02,966 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-06-05 13:07:02,966 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 [2021-06-05 13:07:02,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:07:02,971 INFO L225 Difference]: With dead ends: 4136 [2021-06-05 13:07:02,971 INFO L226 Difference]: Without dead ends: 3737 [2021-06-05 13:07:02,972 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 332 ImplicationChecksByTransitivity, 391.7ms TimeCoverageRelationStatistics Valid=419, Invalid=1303, Unknown=0, NotChecked=0, Total=1722 [2021-06-05 13:07:02,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3737 states. [2021-06-05 13:07:03,008 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3737 to 1743. [2021-06-05 13:07:03,009 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) [2021-06-05 13:07:03,012 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1743 states to 1743 states and 5095 transitions. [2021-06-05 13:07:03,012 INFO L78 Accepts]: Start accepts. Automaton has 1743 states and 5095 transitions. Word has length 15 [2021-06-05 13:07:03,012 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:07:03,012 INFO L482 AbstractCegarLoop]: Abstraction has 1743 states and 5095 transitions. [2021-06-05 13:07:03,012 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) [2021-06-05 13:07:03,012 INFO L276 IsEmpty]: Start isEmpty. Operand 1743 states and 5095 transitions. [2021-06-05 13:07:03,013 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-06-05 13:07:03,013 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:07:03,013 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:07:03,228 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-05 13:07:03,229 INFO L430 AbstractCegarLoop]: === Iteration 12 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:07:03,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:07:03,229 INFO L82 PathProgramCache]: Analyzing trace with hash 987378288, now seen corresponding path program 3 times [2021-06-05 13:07:03,229 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:07:03,229 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [250883175] [2021-06-05 13:07:03,229 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:07:03,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:07:03,272 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:07:03,273 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:07:03,273 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [250883175] [2021-06-05 13:07:03,273 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [250883175] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:07:03,273 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [785011838] [2021-06-05 13:07:03,273 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 [2021-06-05 13:07:03,291 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-06-05 13:07:03,291 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 13:07:03,292 INFO L263 TraceCheckSpWp]: Trace formula consists of 28 conjuncts, 10 conjunts are in the unsatisfiable core [2021-06-05 13:07:03,292 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:07:03,409 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:07:03,409 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [785011838] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:07:03,409 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:07:03,409 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 17 [2021-06-05 13:07:03,409 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [404412659] [2021-06-05 13:07:03,409 INFO L462 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-06-05 13:07:03,409 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:07:03,410 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-06-05 13:07:03,410 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=286, Unknown=0, NotChecked=0, Total=342 [2021-06-05 13:07:03,410 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) [2021-06-05 13:07:04,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:07:04,085 INFO L93 Difference]: Finished difference Result 6386 states and 17512 transitions. [2021-06-05 13:07:04,088 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-06-05 13:07:04,089 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 [2021-06-05 13:07:04,089 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:07:04,097 INFO L225 Difference]: With dead ends: 6386 [2021-06-05 13:07:04,097 INFO L226 Difference]: Without dead ends: 5735 [2021-06-05 13:07:04,097 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 515 ImplicationChecksByTransitivity, 383.3ms TimeCoverageRelationStatistics Valid=522, Invalid=1734, Unknown=0, NotChecked=0, Total=2256 [2021-06-05 13:07:04,109 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5735 states. [2021-06-05 13:07:04,137 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5735 to 1437. [2021-06-05 13:07:04,139 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) [2021-06-05 13:07:04,141 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1437 states to 1437 states and 4133 transitions. [2021-06-05 13:07:04,141 INFO L78 Accepts]: Start accepts. Automaton has 1437 states and 4133 transitions. Word has length 15 [2021-06-05 13:07:04,141 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:07:04,141 INFO L482 AbstractCegarLoop]: Abstraction has 1437 states and 4133 transitions. [2021-06-05 13:07:04,141 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) [2021-06-05 13:07:04,141 INFO L276 IsEmpty]: Start isEmpty. Operand 1437 states and 4133 transitions. [2021-06-05 13:07:04,142 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-06-05 13:07:04,142 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:07:04,142 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:07:04,356 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-05 13:07:04,357 INFO L430 AbstractCegarLoop]: === Iteration 13 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:07:04,357 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:07:04,357 INFO L82 PathProgramCache]: Analyzing trace with hash 940951586, now seen corresponding path program 3 times [2021-06-05 13:07:04,357 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:07:04,357 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [435533210] [2021-06-05 13:07:04,357 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:07:04,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:07:04,399 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-06-05 13:07:04,399 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:07:04,399 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [435533210] [2021-06-05 13:07:04,399 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [435533210] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:07:04,399 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [42573380] [2021-06-05 13:07:04,400 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 [2021-06-05 13:07:04,418 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-06-05 13:07:04,418 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 13:07:04,418 INFO L263 TraceCheckSpWp]: Trace formula consists of 28 conjuncts, 10 conjunts are in the unsatisfiable core [2021-06-05 13:07:04,419 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:07:04,536 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:07:04,536 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [42573380] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:07:04,536 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:07:04,537 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 16 [2021-06-05 13:07:04,537 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1379130594] [2021-06-05 13:07:04,537 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-06-05 13:07:04,537 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:07:04,537 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-06-05 13:07:04,537 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-06-05 13:07:04,537 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) [2021-06-05 13:07:05,249 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:07:05,249 INFO L93 Difference]: Finished difference Result 4968 states and 13831 transitions. [2021-06-05 13:07:05,249 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-06-05 13:07:05,249 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 [2021-06-05 13:07:05,249 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:07:05,255 INFO L225 Difference]: With dead ends: 4968 [2021-06-05 13:07:05,255 INFO L226 Difference]: Without dead ends: 4548 [2021-06-05 13:07:05,256 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 735 ImplicationChecksByTransitivity, 466.1ms TimeCoverageRelationStatistics Valid=672, Invalid=2190, Unknown=0, NotChecked=0, Total=2862 [2021-06-05 13:07:05,265 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4548 states. [2021-06-05 13:07:05,288 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4548 to 1390. [2021-06-05 13:07:05,289 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) [2021-06-05 13:07:05,291 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1390 states to 1390 states and 4011 transitions. [2021-06-05 13:07:05,291 INFO L78 Accepts]: Start accepts. Automaton has 1390 states and 4011 transitions. Word has length 15 [2021-06-05 13:07:05,291 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:07:05,291 INFO L482 AbstractCegarLoop]: Abstraction has 1390 states and 4011 transitions. [2021-06-05 13:07:05,291 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) [2021-06-05 13:07:05,291 INFO L276 IsEmpty]: Start isEmpty. Operand 1390 states and 4011 transitions. [2021-06-05 13:07:05,292 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-06-05 13:07:05,292 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:07:05,292 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:07:05,508 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-06-05 13:07:05,508 INFO L430 AbstractCegarLoop]: === Iteration 14 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:07:05,508 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:07:05,509 INFO L82 PathProgramCache]: Analyzing trace with hash 1484058716, now seen corresponding path program 4 times [2021-06-05 13:07:05,509 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:07:05,509 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [713062090] [2021-06-05 13:07:05,509 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:07:05,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:07:05,544 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-06-05 13:07:05,544 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:07:05,544 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [713062090] [2021-06-05 13:07:05,544 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [713062090] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:07:05,544 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1923107184] [2021-06-05 13:07:05,544 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 [2021-06-05 13:07:05,563 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-06-05 13:07:05,564 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 13:07:05,564 INFO L263 TraceCheckSpWp]: Trace formula consists of 28 conjuncts, 10 conjunts are in the unsatisfiable core [2021-06-05 13:07:05,565 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:07:05,667 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:07:05,668 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1923107184] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:07:05,668 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:07:05,668 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 16 [2021-06-05 13:07:05,668 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [562185998] [2021-06-05 13:07:05,668 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-06-05 13:07:05,668 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:07:05,668 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-06-05 13:07:05,668 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=246, Unknown=0, NotChecked=0, Total=306 [2021-06-05 13:07:05,668 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) [2021-06-05 13:07:06,404 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:07:06,404 INFO L93 Difference]: Finished difference Result 3673 states and 10129 transitions. [2021-06-05 13:07:06,404 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-06-05 13:07:06,404 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 [2021-06-05 13:07:06,404 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:07:06,409 INFO L225 Difference]: With dead ends: 3673 [2021-06-05 13:07:06,409 INFO L226 Difference]: Without dead ends: 3469 [2021-06-05 13:07:06,411 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 818 ImplicationChecksByTransitivity, 495.4ms TimeCoverageRelationStatistics Valid=732, Invalid=2348, Unknown=0, NotChecked=0, Total=3080 [2021-06-05 13:07:06,429 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3469 states. [2021-06-05 13:07:06,444 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3469 to 1096. [2021-06-05 13:07:06,445 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) [2021-06-05 13:07:06,447 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1096 states to 1096 states and 3098 transitions. [2021-06-05 13:07:06,447 INFO L78 Accepts]: Start accepts. Automaton has 1096 states and 3098 transitions. Word has length 15 [2021-06-05 13:07:06,447 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:07:06,447 INFO L482 AbstractCegarLoop]: Abstraction has 1096 states and 3098 transitions. [2021-06-05 13:07:06,447 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) [2021-06-05 13:07:06,447 INFO L276 IsEmpty]: Start isEmpty. Operand 1096 states and 3098 transitions. [2021-06-05 13:07:06,448 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-06-05 13:07:06,448 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:07:06,448 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:07:06,665 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-06-05 13:07:06,665 INFO L430 AbstractCegarLoop]: === Iteration 15 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:07:06,665 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:07:06,665 INFO L82 PathProgramCache]: Analyzing trace with hash 968950709, now seen corresponding path program 1 times [2021-06-05 13:07:06,665 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:07:06,665 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1821290823] [2021-06-05 13:07:06,665 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:07:06,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:07:06,722 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-06-05 13:07:06,722 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:07:06,722 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1821290823] [2021-06-05 13:07:06,722 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1821290823] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:07:06,722 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1725616523] [2021-06-05 13:07:06,722 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 [2021-06-05 13:07:06,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:07:06,743 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 12 conjunts are in the unsatisfiable core [2021-06-05 13:07:06,743 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:07:06,889 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:07:06,889 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1725616523] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:07:06,889 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:07:06,889 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 19 [2021-06-05 13:07:06,889 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1972353382] [2021-06-05 13:07:06,890 INFO L462 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-06-05 13:07:06,890 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:07:06,900 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-06-05 13:07:06,901 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=356, Unknown=0, NotChecked=0, Total=420 [2021-06-05 13:07:06,901 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) [2021-06-05 13:07:10,213 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:07:10,214 INFO L93 Difference]: Finished difference Result 10322 states and 26484 transitions. [2021-06-05 13:07:10,214 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 157 states. [2021-06-05 13:07:10,214 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 [2021-06-05 13:07:10,214 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:07:10,225 INFO L225 Difference]: With dead ends: 10322 [2021-06-05 13:07:10,225 INFO L226 Difference]: Without dead ends: 8749 [2021-06-05 13:07:10,230 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 170 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11769 ImplicationChecksByTransitivity, 2321.5ms TimeCoverageRelationStatistics Valid=4785, Invalid=24627, Unknown=0, NotChecked=0, Total=29412 [2021-06-05 13:07:10,248 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8749 states. [2021-06-05 13:07:10,283 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8749 to 1180. [2021-06-05 13:07:10,284 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) [2021-06-05 13:07:10,286 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1180 states to 1180 states and 3291 transitions. [2021-06-05 13:07:10,286 INFO L78 Accepts]: Start accepts. Automaton has 1180 states and 3291 transitions. Word has length 17 [2021-06-05 13:07:10,286 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:07:10,286 INFO L482 AbstractCegarLoop]: Abstraction has 1180 states and 3291 transitions. [2021-06-05 13:07:10,286 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) [2021-06-05 13:07:10,286 INFO L276 IsEmpty]: Start isEmpty. Operand 1180 states and 3291 transitions. [2021-06-05 13:07:10,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-06-05 13:07:10,287 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:07:10,287 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:07:10,504 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-06-05 13:07:10,505 INFO L430 AbstractCegarLoop]: === Iteration 16 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:07:10,505 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:07:10,505 INFO L82 PathProgramCache]: Analyzing trace with hash 1326146237, now seen corresponding path program 2 times [2021-06-05 13:07:10,505 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:07:10,505 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [142148578] [2021-06-05 13:07:10,505 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:07:10,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:07:10,551 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-06-05 13:07:10,551 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:07:10,551 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [142148578] [2021-06-05 13:07:10,551 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [142148578] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:07:10,551 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1459017251] [2021-06-05 13:07:10,552 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 [2021-06-05 13:07:10,573 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-06-05 13:07:10,573 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 13:07:10,573 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 12 conjunts are in the unsatisfiable core [2021-06-05 13:07:10,574 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:07:10,726 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:07:10,726 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1459017251] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:07:10,726 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:07:10,726 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 19 [2021-06-05 13:07:10,726 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1587868002] [2021-06-05 13:07:10,726 INFO L462 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-06-05 13:07:10,727 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:07:10,727 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-06-05 13:07:10,727 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=351, Unknown=0, NotChecked=0, Total=420 [2021-06-05 13:07:10,727 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) [2021-06-05 13:07:12,441 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:07:12,441 INFO L93 Difference]: Finished difference Result 6894 states and 17893 transitions. [2021-06-05 13:07:12,441 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2021-06-05 13:07:12,442 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 [2021-06-05 13:07:12,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:07:12,450 INFO L225 Difference]: With dead ends: 6894 [2021-06-05 13:07:12,450 INFO L226 Difference]: Without dead ends: 6517 [2021-06-05 13:07:12,450 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3352 ImplicationChecksByTransitivity, 966.6ms TimeCoverageRelationStatistics Valid=1740, Invalid=7962, Unknown=0, NotChecked=0, Total=9702 [2021-06-05 13:07:12,464 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6517 states. [2021-06-05 13:07:12,489 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6517 to 1151. [2021-06-05 13:07:12,491 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) [2021-06-05 13:07:12,492 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1151 states to 1151 states and 3223 transitions. [2021-06-05 13:07:12,492 INFO L78 Accepts]: Start accepts. Automaton has 1151 states and 3223 transitions. Word has length 17 [2021-06-05 13:07:12,492 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:07:12,492 INFO L482 AbstractCegarLoop]: Abstraction has 1151 states and 3223 transitions. [2021-06-05 13:07:12,492 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) [2021-06-05 13:07:12,492 INFO L276 IsEmpty]: Start isEmpty. Operand 1151 states and 3223 transitions. [2021-06-05 13:07:12,493 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-06-05 13:07:12,493 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:07:12,493 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:07:12,702 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-06-05 13:07:12,703 INFO L430 AbstractCegarLoop]: === Iteration 17 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:07:12,703 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:07:12,703 INFO L82 PathProgramCache]: Analyzing trace with hash -796964677, now seen corresponding path program 3 times [2021-06-05 13:07:12,703 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:07:12,703 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1509700035] [2021-06-05 13:07:12,703 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:07:12,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:07:12,753 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-06-05 13:07:12,753 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:07:12,753 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1509700035] [2021-06-05 13:07:12,753 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1509700035] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:07:12,753 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1765916527] [2021-06-05 13:07:12,753 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 [2021-06-05 13:07:12,772 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-06-05 13:07:12,772 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 13:07:12,772 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 12 conjunts are in the unsatisfiable core [2021-06-05 13:07:12,773 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:07:12,906 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:07:12,906 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1765916527] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:07:12,906 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:07:12,906 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11] total 20 [2021-06-05 13:07:12,907 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [503418443] [2021-06-05 13:07:12,907 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-06-05 13:07:12,907 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:07:12,907 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-06-05 13:07:12,907 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=395, Unknown=0, NotChecked=0, Total=462 [2021-06-05 13:07:12,907 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) [2021-06-05 13:07:15,451 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:07:15,451 INFO L93 Difference]: Finished difference Result 10275 states and 26496 transitions. [2021-06-05 13:07:15,452 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 130 states. [2021-06-05 13:07:15,452 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 [2021-06-05 13:07:15,452 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:07:15,465 INFO L225 Difference]: With dead ends: 10275 [2021-06-05 13:07:15,465 INFO L226 Difference]: Without dead ends: 9544 [2021-06-05 13:07:15,467 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 145 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8451 ImplicationChecksByTransitivity, 1787.7ms TimeCoverageRelationStatistics Valid=4325, Invalid=17137, Unknown=0, NotChecked=0, Total=21462 [2021-06-05 13:07:15,487 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9544 states. [2021-06-05 13:07:15,525 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9544 to 1138. [2021-06-05 13:07:15,527 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) [2021-06-05 13:07:15,528 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1138 states to 1138 states and 3187 transitions. [2021-06-05 13:07:15,528 INFO L78 Accepts]: Start accepts. Automaton has 1138 states and 3187 transitions. Word has length 17 [2021-06-05 13:07:15,528 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:07:15,528 INFO L482 AbstractCegarLoop]: Abstraction has 1138 states and 3187 transitions. [2021-06-05 13:07:15,528 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) [2021-06-05 13:07:15,528 INFO L276 IsEmpty]: Start isEmpty. Operand 1138 states and 3187 transitions. [2021-06-05 13:07:15,529 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-06-05 13:07:15,529 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:07:15,529 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:07:15,744 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-06-05 13:07:15,745 INFO L430 AbstractCegarLoop]: === Iteration 18 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:07:15,745 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:07:15,745 INFO L82 PathProgramCache]: Analyzing trace with hash -1225057825, now seen corresponding path program 4 times [2021-06-05 13:07:15,745 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:07:15,745 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1886801399] [2021-06-05 13:07:15,745 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:07:15,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:07:15,797 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-06-05 13:07:15,797 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:07:15,798 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1886801399] [2021-06-05 13:07:15,798 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1886801399] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:07:15,798 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1449105977] [2021-06-05 13:07:15,798 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 [2021-06-05 13:07:15,816 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-06-05 13:07:15,816 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 13:07:15,816 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 12 conjunts are in the unsatisfiable core [2021-06-05 13:07:15,817 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:07:15,943 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:07:15,943 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1449105977] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:07:15,943 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:07:15,943 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 19 [2021-06-05 13:07:15,943 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1296446560] [2021-06-05 13:07:15,944 INFO L462 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-06-05 13:07:15,944 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:07:15,944 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-06-05 13:07:15,944 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=348, Unknown=0, NotChecked=0, Total=420 [2021-06-05 13:07:15,944 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) [2021-06-05 13:07:17,327 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:07:17,327 INFO L93 Difference]: Finished difference Result 5037 states and 12832 transitions. [2021-06-05 13:07:17,327 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2021-06-05 13:07:17,327 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 [2021-06-05 13:07:17,327 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:07:17,333 INFO L225 Difference]: With dead ends: 5037 [2021-06-05 13:07:17,333 INFO L226 Difference]: Without dead ends: 4775 [2021-06-05 13:07:17,334 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2751 ImplicationChecksByTransitivity, 879.9ms TimeCoverageRelationStatistics Valid=1574, Invalid=6258, Unknown=0, NotChecked=0, Total=7832 [2021-06-05 13:07:17,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4775 states. [2021-06-05 13:07:17,364 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4775 to 1123. [2021-06-05 13:07:17,365 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) [2021-06-05 13:07:17,366 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1123 states to 1123 states and 3159 transitions. [2021-06-05 13:07:17,366 INFO L78 Accepts]: Start accepts. Automaton has 1123 states and 3159 transitions. Word has length 17 [2021-06-05 13:07:17,366 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:07:17,366 INFO L482 AbstractCegarLoop]: Abstraction has 1123 states and 3159 transitions. [2021-06-05 13:07:17,367 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) [2021-06-05 13:07:17,367 INFO L276 IsEmpty]: Start isEmpty. Operand 1123 states and 3159 transitions. [2021-06-05 13:07:17,367 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-06-05 13:07:17,367 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:07:17,367 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:07:17,583 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-05 13:07:17,583 INFO L430 AbstractCegarLoop]: === Iteration 19 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:07:17,584 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:07:17,584 INFO L82 PathProgramCache]: Analyzing trace with hash 224899923, now seen corresponding path program 5 times [2021-06-05 13:07:17,584 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:07:17,584 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [733431401] [2021-06-05 13:07:17,584 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:07:17,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:07:17,648 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:07:17,648 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:07:17,649 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [733431401] [2021-06-05 13:07:17,649 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [733431401] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:07:17,649 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [744425999] [2021-06-05 13:07:17,649 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 [2021-06-05 13:07:17,668 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-06-05 13:07:17,669 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 13:07:17,669 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 12 conjunts are in the unsatisfiable core [2021-06-05 13:07:17,669 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:07:17,808 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:07:17,808 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [744425999] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:07:17,808 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:07:17,808 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 21 [2021-06-05 13:07:17,808 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1087982525] [2021-06-05 13:07:17,808 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-06-05 13:07:17,808 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:07:17,809 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-06-05 13:07:17,809 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=431, Unknown=0, NotChecked=0, Total=506 [2021-06-05 13:07:17,809 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) [2021-06-05 13:07:18,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:07:18,943 INFO L93 Difference]: Finished difference Result 5081 states and 13306 transitions. [2021-06-05 13:07:18,943 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2021-06-05 13:07:18,943 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 [2021-06-05 13:07:18,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:07:18,948 INFO L225 Difference]: With dead ends: 5081 [2021-06-05 13:07:18,948 INFO L226 Difference]: Without dead ends: 4469 [2021-06-05 13:07:18,949 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1908 ImplicationChecksByTransitivity, 757.3ms TimeCoverageRelationStatistics Valid=1343, Invalid=4977, Unknown=0, NotChecked=0, Total=6320 [2021-06-05 13:07:18,958 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4469 states. [2021-06-05 13:07:18,976 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4469 to 1155. [2021-06-05 13:07:18,978 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) [2021-06-05 13:07:18,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1155 states to 1155 states and 3232 transitions. [2021-06-05 13:07:18,979 INFO L78 Accepts]: Start accepts. Automaton has 1155 states and 3232 transitions. Word has length 17 [2021-06-05 13:07:18,979 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:07:18,979 INFO L482 AbstractCegarLoop]: Abstraction has 1155 states and 3232 transitions. [2021-06-05 13:07:18,979 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) [2021-06-05 13:07:18,980 INFO L276 IsEmpty]: Start isEmpty. Operand 1155 states and 3232 transitions. [2021-06-05 13:07:18,980 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-06-05 13:07:18,980 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:07:18,980 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:07:19,196 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-06-05 13:07:19,196 INFO L430 AbstractCegarLoop]: === Iteration 20 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:07:19,196 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:07:19,196 INFO L82 PathProgramCache]: Analyzing trace with hash 215376723, now seen corresponding path program 6 times [2021-06-05 13:07:19,197 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:07:19,197 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [456307920] [2021-06-05 13:07:19,197 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:07:19,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:07:19,252 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:07:19,252 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:07:19,252 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [456307920] [2021-06-05 13:07:19,252 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [456307920] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:07:19,252 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [250481986] [2021-06-05 13:07:19,252 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 [2021-06-05 13:07:19,273 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-06-05 13:07:19,273 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 13:07:19,274 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 12 conjunts are in the unsatisfiable core [2021-06-05 13:07:19,274 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:07:19,414 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:07:19,415 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [250481986] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:07:19,415 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:07:19,415 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 21 [2021-06-05 13:07:19,415 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [887262592] [2021-06-05 13:07:19,415 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-06-05 13:07:19,415 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:07:19,415 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-06-05 13:07:19,415 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=431, Unknown=0, NotChecked=0, Total=506 [2021-06-05 13:07:19,416 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) [2021-06-05 13:07:20,904 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:07:20,904 INFO L93 Difference]: Finished difference Result 5995 states and 15370 transitions. [2021-06-05 13:07:20,904 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2021-06-05 13:07:20,904 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 [2021-06-05 13:07:20,904 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:07:20,910 INFO L225 Difference]: With dead ends: 5995 [2021-06-05 13:07:20,911 INFO L226 Difference]: Without dead ends: 5367 [2021-06-05 13:07:20,911 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3589 ImplicationChecksByTransitivity, 1009.3ms TimeCoverageRelationStatistics Valid=1947, Invalid=8559, Unknown=0, NotChecked=0, Total=10506 [2021-06-05 13:07:20,932 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5367 states. [2021-06-05 13:07:20,948 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5367 to 1127. [2021-06-05 13:07:20,949 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) [2021-06-05 13:07:20,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1127 states to 1127 states and 3158 transitions. [2021-06-05 13:07:20,950 INFO L78 Accepts]: Start accepts. Automaton has 1127 states and 3158 transitions. Word has length 17 [2021-06-05 13:07:20,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:07:20,950 INFO L482 AbstractCegarLoop]: Abstraction has 1127 states and 3158 transitions. [2021-06-05 13:07:20,950 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) [2021-06-05 13:07:20,951 INFO L276 IsEmpty]: Start isEmpty. Operand 1127 states and 3158 transitions. [2021-06-05 13:07:20,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-06-05 13:07:20,951 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:07:20,951 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:07:21,160 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-06-05 13:07:21,161 INFO L430 AbstractCegarLoop]: === Iteration 21 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:07:21,161 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:07:21,161 INFO L82 PathProgramCache]: Analyzing trace with hash -340116773, now seen corresponding path program 7 times [2021-06-05 13:07:21,161 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:07:21,161 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1907126725] [2021-06-05 13:07:21,161 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:07:21,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:07:21,200 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-06-05 13:07:21,200 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:07:21,200 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1907126725] [2021-06-05 13:07:21,201 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1907126725] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:07:21,201 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [698419523] [2021-06-05 13:07:21,201 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 [2021-06-05 13:07:21,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:07:21,221 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 12 conjunts are in the unsatisfiable core [2021-06-05 13:07:21,221 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:07:21,361 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:07:21,362 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [698419523] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:07:21,362 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:07:21,362 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 19 [2021-06-05 13:07:21,362 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [572225115] [2021-06-05 13:07:21,362 INFO L462 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-06-05 13:07:21,362 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:07:21,362 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-06-05 13:07:21,362 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=348, Unknown=0, NotChecked=0, Total=420 [2021-06-05 13:07:21,362 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) [2021-06-05 13:07:21,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:07:21,965 INFO L93 Difference]: Finished difference Result 3426 states and 9034 transitions. [2021-06-05 13:07:21,965 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-06-05 13:07:21,965 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 [2021-06-05 13:07:21,965 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:07:21,969 INFO L225 Difference]: With dead ends: 3426 [2021-06-05 13:07:21,969 INFO L226 Difference]: Without dead ends: 3081 [2021-06-05 13:07:21,970 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 738 ImplicationChecksByTransitivity, 413.1ms TimeCoverageRelationStatistics Valid=633, Invalid=2229, Unknown=0, NotChecked=0, Total=2862 [2021-06-05 13:07:21,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3081 states. [2021-06-05 13:07:21,989 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3081 to 1123. [2021-06-05 13:07:21,990 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) [2021-06-05 13:07:21,991 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1123 states to 1123 states and 3151 transitions. [2021-06-05 13:07:21,991 INFO L78 Accepts]: Start accepts. Automaton has 1123 states and 3151 transitions. Word has length 17 [2021-06-05 13:07:21,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:07:21,991 INFO L482 AbstractCegarLoop]: Abstraction has 1123 states and 3151 transitions. [2021-06-05 13:07:21,991 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) [2021-06-05 13:07:21,991 INFO L276 IsEmpty]: Start isEmpty. Operand 1123 states and 3151 transitions. [2021-06-05 13:07:21,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-06-05 13:07:21,992 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:07:21,992 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:07:22,196 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,26 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-05 13:07:22,197 INFO L430 AbstractCegarLoop]: === Iteration 22 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:07:22,197 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:07:22,197 INFO L82 PathProgramCache]: Analyzing trace with hash -112342949, now seen corresponding path program 8 times [2021-06-05 13:07:22,197 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:07:22,197 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1302872841] [2021-06-05 13:07:22,197 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:07:22,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:07:22,251 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:07:22,252 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:07:22,252 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1302872841] [2021-06-05 13:07:22,252 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1302872841] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:07:22,252 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1571647733] [2021-06-05 13:07:22,252 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 [2021-06-05 13:07:22,270 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-06-05 13:07:22,270 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 13:07:22,271 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 12 conjunts are in the unsatisfiable core [2021-06-05 13:07:22,271 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:07:22,414 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:07:22,414 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1571647733] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:07:22,414 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:07:22,414 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 21 [2021-06-05 13:07:22,414 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [697427750] [2021-06-05 13:07:22,414 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-06-05 13:07:22,414 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:07:22,415 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-06-05 13:07:22,415 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=423, Unknown=0, NotChecked=0, Total=506 [2021-06-05 13:07:22,415 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) [2021-06-05 13:07:23,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:07:23,308 INFO L93 Difference]: Finished difference Result 4283 states and 11040 transitions. [2021-06-05 13:07:23,308 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-06-05 13:07:23,308 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 [2021-06-05 13:07:23,308 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:07:23,313 INFO L225 Difference]: With dead ends: 4283 [2021-06-05 13:07:23,313 INFO L226 Difference]: Without dead ends: 4022 [2021-06-05 13:07:23,313 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1218 ImplicationChecksByTransitivity, 533.7ms TimeCoverageRelationStatistics Valid=906, Invalid=3384, Unknown=0, NotChecked=0, Total=4290 [2021-06-05 13:07:23,322 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4022 states. [2021-06-05 13:07:23,337 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4022 to 1114. [2021-06-05 13:07:23,338 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) [2021-06-05 13:07:23,340 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1114 states to 1114 states and 3100 transitions. [2021-06-05 13:07:23,340 INFO L78 Accepts]: Start accepts. Automaton has 1114 states and 3100 transitions. Word has length 17 [2021-06-05 13:07:23,340 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:07:23,340 INFO L482 AbstractCegarLoop]: Abstraction has 1114 states and 3100 transitions. [2021-06-05 13:07:23,340 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) [2021-06-05 13:07:23,340 INFO L276 IsEmpty]: Start isEmpty. Operand 1114 states and 3100 transitions. [2021-06-05 13:07:23,341 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-06-05 13:07:23,341 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:07:23,341 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:07:23,544 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,27 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-05 13:07:23,544 INFO L430 AbstractCegarLoop]: === Iteration 23 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:07:23,544 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:07:23,544 INFO L82 PathProgramCache]: Analyzing trace with hash -117104549, now seen corresponding path program 9 times [2021-06-05 13:07:23,545 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:07:23,545 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1320649938] [2021-06-05 13:07:23,545 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:07:23,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:07:23,604 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:07:23,605 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:07:23,605 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1320649938] [2021-06-05 13:07:23,605 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1320649938] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:07:23,605 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1965373142] [2021-06-05 13:07:23,605 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 [2021-06-05 13:07:23,623 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-06-05 13:07:23,623 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 13:07:23,623 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 12 conjunts are in the unsatisfiable core [2021-06-05 13:07:23,624 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:07:23,754 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:07:23,754 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1965373142] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:07:23,760 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:07:23,760 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 21 [2021-06-05 13:07:23,760 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [584375621] [2021-06-05 13:07:23,761 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-06-05 13:07:23,761 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:07:23,761 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-06-05 13:07:23,761 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=423, Unknown=0, NotChecked=0, Total=506 [2021-06-05 13:07:23,761 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) [2021-06-05 13:07:24,859 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:07:24,859 INFO L93 Difference]: Finished difference Result 3935 states and 9986 transitions. [2021-06-05 13:07:24,859 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2021-06-05 13:07:24,859 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 [2021-06-05 13:07:24,859 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:07:24,863 INFO L225 Difference]: With dead ends: 3935 [2021-06-05 13:07:24,863 INFO L226 Difference]: Without dead ends: 3639 [2021-06-05 13:07:24,864 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1859 ImplicationChecksByTransitivity, 674.0ms TimeCoverageRelationStatistics Valid=1188, Invalid=4974, Unknown=0, NotChecked=0, Total=6162 [2021-06-05 13:07:24,872 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3639 states. [2021-06-05 13:07:24,886 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3639 to 1064. [2021-06-05 13:07:24,887 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) [2021-06-05 13:07:24,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1064 states to 1064 states and 2985 transitions. [2021-06-05 13:07:24,888 INFO L78 Accepts]: Start accepts. Automaton has 1064 states and 2985 transitions. Word has length 17 [2021-06-05 13:07:24,888 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:07:24,888 INFO L482 AbstractCegarLoop]: Abstraction has 1064 states and 2985 transitions. [2021-06-05 13:07:24,888 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) [2021-06-05 13:07:24,888 INFO L276 IsEmpty]: Start isEmpty. Operand 1064 states and 2985 transitions. [2021-06-05 13:07:24,889 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-06-05 13:07:24,889 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:07:24,889 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:07:25,089 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable31 [2021-06-05 13:07:25,090 INFO L430 AbstractCegarLoop]: === Iteration 24 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:07:25,090 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:07:25,090 INFO L82 PathProgramCache]: Analyzing trace with hash -307704103, now seen corresponding path program 10 times [2021-06-05 13:07:25,090 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:07:25,090 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1458806088] [2021-06-05 13:07:25,090 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:07:25,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:07:25,162 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:07:25,162 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:07:25,162 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1458806088] [2021-06-05 13:07:25,162 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1458806088] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:07:25,162 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1419165705] [2021-06-05 13:07:25,162 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 [2021-06-05 13:07:25,184 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-06-05 13:07:25,184 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 13:07:25,184 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 12 conjunts are in the unsatisfiable core [2021-06-05 13:07:25,185 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:07:25,307 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:07:25,307 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1419165705] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:07:25,307 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:07:25,307 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 21 [2021-06-05 13:07:25,308 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [699329357] [2021-06-05 13:07:25,308 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-06-05 13:07:25,309 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:07:25,309 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-06-05 13:07:25,309 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=434, Unknown=0, NotChecked=0, Total=506 [2021-06-05 13:07:25,309 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) [2021-06-05 13:07:26,389 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:07:26,389 INFO L93 Difference]: Finished difference Result 5352 states and 13715 transitions. [2021-06-05 13:07:26,390 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2021-06-05 13:07:26,390 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 [2021-06-05 13:07:26,390 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:07:26,395 INFO L225 Difference]: With dead ends: 5352 [2021-06-05 13:07:26,395 INFO L226 Difference]: Without dead ends: 4731 [2021-06-05 13:07:26,395 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1642 ImplicationChecksByTransitivity, 750.1ms TimeCoverageRelationStatistics Valid=1382, Invalid=4470, Unknown=0, NotChecked=0, Total=5852 [2021-06-05 13:07:26,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4731 states. [2021-06-05 13:07:26,421 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4731 to 1055. [2021-06-05 13:07:26,422 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) [2021-06-05 13:07:26,424 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1055 states to 1055 states and 2931 transitions. [2021-06-05 13:07:26,424 INFO L78 Accepts]: Start accepts. Automaton has 1055 states and 2931 transitions. Word has length 17 [2021-06-05 13:07:26,424 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:07:26,424 INFO L482 AbstractCegarLoop]: Abstraction has 1055 states and 2931 transitions. [2021-06-05 13:07:26,424 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) [2021-06-05 13:07:26,424 INFO L276 IsEmpty]: Start isEmpty. Operand 1055 states and 2931 transitions. [2021-06-05 13:07:26,425 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-06-05 13:07:26,425 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:07:26,425 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:07:26,625 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,29 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-05 13:07:26,625 INFO L430 AbstractCegarLoop]: === Iteration 25 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:07:26,626 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:07:26,626 INFO L82 PathProgramCache]: Analyzing trace with hash -317227303, now seen corresponding path program 11 times [2021-06-05 13:07:26,626 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:07:26,626 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [143555838] [2021-06-05 13:07:26,626 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:07:26,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:07:26,686 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:07:26,686 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:07:26,686 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [143555838] [2021-06-05 13:07:26,686 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [143555838] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:07:26,686 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [733925933] [2021-06-05 13:07:26,686 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 [2021-06-05 13:07:26,705 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-06-05 13:07:26,705 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 13:07:26,705 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 12 conjunts are in the unsatisfiable core [2021-06-05 13:07:26,705 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:07:26,835 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:07:26,836 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [733925933] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:07:26,836 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:07:26,836 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 21 [2021-06-05 13:07:26,836 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1446469546] [2021-06-05 13:07:26,836 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-06-05 13:07:26,836 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:07:26,836 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-06-05 13:07:26,836 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=434, Unknown=0, NotChecked=0, Total=506 [2021-06-05 13:07:26,837 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) [2021-06-05 13:07:28,159 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:07:28,159 INFO L93 Difference]: Finished difference Result 4588 states and 11650 transitions. [2021-06-05 13:07:28,160 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2021-06-05 13:07:28,160 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 [2021-06-05 13:07:28,160 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:07:28,164 INFO L225 Difference]: With dead ends: 4588 [2021-06-05 13:07:28,164 INFO L226 Difference]: Without dead ends: 3990 [2021-06-05 13:07:28,165 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2309 ImplicationChecksByTransitivity, 872.3ms TimeCoverageRelationStatistics Valid=1581, Invalid=6075, Unknown=0, NotChecked=0, Total=7656 [2021-06-05 13:07:28,173 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3990 states. [2021-06-05 13:07:28,186 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3990 to 877. [2021-06-05 13:07:28,187 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) [2021-06-05 13:07:28,188 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 877 states to 877 states and 2406 transitions. [2021-06-05 13:07:28,188 INFO L78 Accepts]: Start accepts. Automaton has 877 states and 2406 transitions. Word has length 17 [2021-06-05 13:07:28,188 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:07:28,188 INFO L482 AbstractCegarLoop]: Abstraction has 877 states and 2406 transitions. [2021-06-05 13:07:28,189 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) [2021-06-05 13:07:28,189 INFO L276 IsEmpty]: Start isEmpty. Operand 877 states and 2406 transitions. [2021-06-05 13:07:28,189 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-06-05 13:07:28,189 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:07:28,189 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:07:28,389 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2021-06-05 13:07:28,390 INFO L430 AbstractCegarLoop]: === Iteration 26 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:07:28,390 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:07:28,390 INFO L82 PathProgramCache]: Analyzing trace with hash -872720799, now seen corresponding path program 12 times [2021-06-05 13:07:28,390 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:07:28,390 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [34527401] [2021-06-05 13:07:28,390 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:07:28,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:07:28,440 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-06-05 13:07:28,440 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:07:28,440 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [34527401] [2021-06-05 13:07:28,440 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [34527401] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:07:28,440 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2044979840] [2021-06-05 13:07:28,440 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 [2021-06-05 13:07:28,462 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-06-05 13:07:28,462 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 13:07:28,462 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 12 conjunts are in the unsatisfiable core [2021-06-05 13:07:28,462 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:07:28,606 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:07:28,606 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2044979840] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:07:28,606 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:07:28,606 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 19 [2021-06-05 13:07:28,606 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [479308694] [2021-06-05 13:07:28,607 INFO L462 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-06-05 13:07:28,607 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:07:28,607 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-06-05 13:07:28,607 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=353, Unknown=0, NotChecked=0, Total=420 [2021-06-05 13:07:28,607 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) [2021-06-05 13:07:29,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:07:29,467 INFO L93 Difference]: Finished difference Result 3426 states and 8779 transitions. [2021-06-05 13:07:29,467 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-06-05 13:07:29,467 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 [2021-06-05 13:07:29,467 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:07:29,470 INFO L225 Difference]: With dead ends: 3426 [2021-06-05 13:07:29,470 INFO L226 Difference]: Without dead ends: 3081 [2021-06-05 13:07:29,471 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1265 ImplicationChecksByTransitivity, 556.3ms TimeCoverageRelationStatistics Valid=968, Invalid=3454, Unknown=0, NotChecked=0, Total=4422 [2021-06-05 13:07:29,477 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3081 states. [2021-06-05 13:07:29,488 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3081 to 873. [2021-06-05 13:07:29,489 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) [2021-06-05 13:07:29,490 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 873 states to 873 states and 2399 transitions. [2021-06-05 13:07:29,490 INFO L78 Accepts]: Start accepts. Automaton has 873 states and 2399 transitions. Word has length 17 [2021-06-05 13:07:29,490 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:07:29,490 INFO L482 AbstractCegarLoop]: Abstraction has 873 states and 2399 transitions. [2021-06-05 13:07:29,490 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) [2021-06-05 13:07:29,490 INFO L276 IsEmpty]: Start isEmpty. Operand 873 states and 2399 transitions. [2021-06-05 13:07:29,491 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-06-05 13:07:29,491 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:07:29,491 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:07:29,707 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34,31 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-05 13:07:29,707 INFO L430 AbstractCegarLoop]: === Iteration 27 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:07:29,707 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:07:29,707 INFO L82 PathProgramCache]: Analyzing trace with hash 381361351, now seen corresponding path program 13 times [2021-06-05 13:07:29,707 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:07:29,707 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1148692175] [2021-06-05 13:07:29,707 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:07:29,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:07:29,752 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-06-05 13:07:29,752 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:07:29,752 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1148692175] [2021-06-05 13:07:29,752 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1148692175] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:07:29,752 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1517530796] [2021-06-05 13:07:29,752 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 [2021-06-05 13:07:29,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:07:29,771 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 12 conjunts are in the unsatisfiable core [2021-06-05 13:07:29,771 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:07:29,911 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:07:29,911 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1517530796] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:07:29,911 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:07:29,911 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 19 [2021-06-05 13:07:29,912 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1974110963] [2021-06-05 13:07:29,912 INFO L462 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-06-05 13:07:29,912 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:07:29,912 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-06-05 13:07:29,912 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=356, Unknown=0, NotChecked=0, Total=420 [2021-06-05 13:07:29,912 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) [2021-06-05 13:07:30,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:07:30,617 INFO L93 Difference]: Finished difference Result 2668 states and 6811 transitions. [2021-06-05 13:07:30,617 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-06-05 13:07:30,617 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 [2021-06-05 13:07:30,617 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:07:30,620 INFO L225 Difference]: With dead ends: 2668 [2021-06-05 13:07:30,620 INFO L226 Difference]: Without dead ends: 2353 [2021-06-05 13:07:30,620 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 667 ImplicationChecksByTransitivity, 510.2ms TimeCoverageRelationStatistics Valid=594, Invalid=2162, Unknown=0, NotChecked=0, Total=2756 [2021-06-05 13:07:30,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2353 states. [2021-06-05 13:07:30,634 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2353 to 858. [2021-06-05 13:07:30,635 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) [2021-06-05 13:07:30,636 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 858 states to 858 states and 2359 transitions. [2021-06-05 13:07:30,636 INFO L78 Accepts]: Start accepts. Automaton has 858 states and 2359 transitions. Word has length 17 [2021-06-05 13:07:30,636 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:07:30,636 INFO L482 AbstractCegarLoop]: Abstraction has 858 states and 2359 transitions. [2021-06-05 13:07:30,636 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) [2021-06-05 13:07:30,636 INFO L276 IsEmpty]: Start isEmpty. Operand 858 states and 2359 transitions. [2021-06-05 13:07:30,637 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-06-05 13:07:30,637 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:07:30,637 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:07:30,837 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2021-06-05 13:07:30,844 INFO L430 AbstractCegarLoop]: === Iteration 28 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:07:30,844 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:07:30,844 INFO L82 PathProgramCache]: Analyzing trace with hash -821169831, now seen corresponding path program 14 times [2021-06-05 13:07:30,844 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:07:30,844 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1631532142] [2021-06-05 13:07:30,844 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:07:30,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:07:30,883 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-06-05 13:07:30,883 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:07:30,883 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1631532142] [2021-06-05 13:07:30,883 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1631532142] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:07:30,883 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [684996735] [2021-06-05 13:07:30,883 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 [2021-06-05 13:07:30,901 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-06-05 13:07:30,902 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 13:07:30,902 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 12 conjunts are in the unsatisfiable core [2021-06-05 13:07:30,902 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:07:31,022 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:07:31,022 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [684996735] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:07:31,022 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:07:31,022 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 19 [2021-06-05 13:07:31,022 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1062178381] [2021-06-05 13:07:31,022 INFO L462 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-06-05 13:07:31,023 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:07:31,023 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-06-05 13:07:31,023 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=354, Unknown=0, NotChecked=0, Total=420 [2021-06-05 13:07:31,023 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) [2021-06-05 13:07:32,888 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:07:32,888 INFO L93 Difference]: Finished difference Result 5819 states and 14828 transitions. [2021-06-05 13:07:32,888 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2021-06-05 13:07:32,888 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 [2021-06-05 13:07:32,889 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:07:32,894 INFO L225 Difference]: With dead ends: 5819 [2021-06-05 13:07:32,894 INFO L226 Difference]: Without dead ends: 5006 [2021-06-05 13:07:32,895 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4301 ImplicationChecksByTransitivity, 1306.2ms TimeCoverageRelationStatistics Valid=2380, Invalid=10276, Unknown=0, NotChecked=0, Total=12656 [2021-06-05 13:07:32,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5006 states. [2021-06-05 13:07:32,922 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5006 to 935. [2021-06-05 13:07:32,923 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) [2021-06-05 13:07:32,924 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 935 states to 935 states and 2615 transitions. [2021-06-05 13:07:32,924 INFO L78 Accepts]: Start accepts. Automaton has 935 states and 2615 transitions. Word has length 17 [2021-06-05 13:07:32,924 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:07:32,924 INFO L482 AbstractCegarLoop]: Abstraction has 935 states and 2615 transitions. [2021-06-05 13:07:32,924 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) [2021-06-05 13:07:32,924 INFO L276 IsEmpty]: Start isEmpty. Operand 935 states and 2615 transitions. [2021-06-05 13:07:32,925 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-06-05 13:07:32,925 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:07:32,925 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:07:33,125 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-06-05 13:07:33,126 INFO L430 AbstractCegarLoop]: === Iteration 29 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:07:33,126 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:07:33,126 INFO L82 PathProgramCache]: Analyzing trace with hash -1682422945, now seen corresponding path program 15 times [2021-06-05 13:07:33,126 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:07:33,126 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1463411985] [2021-06-05 13:07:33,126 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:07:33,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:07:33,168 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-06-05 13:07:33,168 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:07:33,168 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1463411985] [2021-06-05 13:07:33,169 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1463411985] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:07:33,169 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1041212256] [2021-06-05 13:07:33,169 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 [2021-06-05 13:07:33,187 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-06-05 13:07:33,187 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 13:07:33,187 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 12 conjunts are in the unsatisfiable core [2021-06-05 13:07:33,188 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:07:33,333 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:07:33,333 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1041212256] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:07:33,333 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:07:33,333 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 19 [2021-06-05 13:07:33,333 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [223573214] [2021-06-05 13:07:33,334 INFO L462 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-06-05 13:07:33,334 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:07:33,334 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-06-05 13:07:33,334 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=348, Unknown=0, NotChecked=0, Total=420 [2021-06-05 13:07:33,334 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) [2021-06-05 13:07:34,848 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:07:34,849 INFO L93 Difference]: Finished difference Result 4438 states and 11478 transitions. [2021-06-05 13:07:34,849 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2021-06-05 13:07:34,849 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 [2021-06-05 13:07:34,849 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:07:34,854 INFO L225 Difference]: With dead ends: 4438 [2021-06-05 13:07:34,854 INFO L226 Difference]: Without dead ends: 3954 [2021-06-05 13:07:34,854 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2902 ImplicationChecksByTransitivity, 975.9ms TimeCoverageRelationStatistics Valid=1735, Invalid=7007, Unknown=0, NotChecked=0, Total=8742 [2021-06-05 13:07:34,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3954 states. [2021-06-05 13:07:34,876 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3954 to 907. [2021-06-05 13:07:34,876 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) [2021-06-05 13:07:34,878 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 907 states to 907 states and 2555 transitions. [2021-06-05 13:07:34,878 INFO L78 Accepts]: Start accepts. Automaton has 907 states and 2555 transitions. Word has length 17 [2021-06-05 13:07:34,878 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:07:34,878 INFO L482 AbstractCegarLoop]: Abstraction has 907 states and 2555 transitions. [2021-06-05 13:07:34,878 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) [2021-06-05 13:07:34,878 INFO L276 IsEmpty]: Start isEmpty. Operand 907 states and 2555 transitions. [2021-06-05 13:07:34,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-06-05 13:07:34,878 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:07:34,878 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:07:35,092 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2021-06-05 13:07:35,093 INFO L430 AbstractCegarLoop]: === Iteration 30 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:07:35,093 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:07:35,093 INFO L82 PathProgramCache]: Analyzing trace with hash 1954142233, now seen corresponding path program 16 times [2021-06-05 13:07:35,093 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:07:35,093 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1286245064] [2021-06-05 13:07:35,093 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:07:35,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:07:35,141 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-06-05 13:07:35,141 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:07:35,141 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1286245064] [2021-06-05 13:07:35,141 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1286245064] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:07:35,141 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [340539217] [2021-06-05 13:07:35,141 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 [2021-06-05 13:07:35,159 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-06-05 13:07:35,159 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 13:07:35,160 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 12 conjunts are in the unsatisfiable core [2021-06-05 13:07:35,160 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:07:35,301 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:07:35,301 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [340539217] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:07:35,301 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:07:35,301 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11] total 20 [2021-06-05 13:07:35,301 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1395411035] [2021-06-05 13:07:35,301 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-06-05 13:07:35,301 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:07:35,302 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-06-05 13:07:35,302 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=396, Unknown=0, NotChecked=0, Total=462 [2021-06-05 13:07:35,302 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) [2021-06-05 13:07:36,711 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:07:36,712 INFO L93 Difference]: Finished difference Result 3573 states and 9223 transitions. [2021-06-05 13:07:36,712 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2021-06-05 13:07:36,712 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 [2021-06-05 13:07:36,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:07:36,715 INFO L225 Difference]: With dead ends: 3573 [2021-06-05 13:07:36,715 INFO L226 Difference]: Without dead ends: 2462 [2021-06-05 13:07:36,715 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2198 ImplicationChecksByTransitivity, 1063.6ms TimeCoverageRelationStatistics Valid=1672, Invalid=5810, Unknown=0, NotChecked=0, Total=7482 [2021-06-05 13:07:36,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2462 states. [2021-06-05 13:07:36,730 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2462 to 833. [2021-06-05 13:07:36,730 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) [2021-06-05 13:07:36,731 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 833 states to 833 states and 2268 transitions. [2021-06-05 13:07:36,731 INFO L78 Accepts]: Start accepts. Automaton has 833 states and 2268 transitions. Word has length 17 [2021-06-05 13:07:36,731 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:07:36,731 INFO L482 AbstractCegarLoop]: Abstraction has 833 states and 2268 transitions. [2021-06-05 13:07:36,732 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) [2021-06-05 13:07:36,732 INFO L276 IsEmpty]: Start isEmpty. Operand 833 states and 2268 transitions. [2021-06-05 13:07:36,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-06-05 13:07:36,732 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:07:36,732 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:07:36,935 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-06-05 13:07:36,935 INFO L430 AbstractCegarLoop]: === Iteration 31 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:07:36,935 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:07:36,935 INFO L82 PathProgramCache]: Analyzing trace with hash -1983629535, now seen corresponding path program 17 times [2021-06-05 13:07:36,935 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:07:36,935 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1675415610] [2021-06-05 13:07:36,936 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:07:36,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:07:37,003 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-06-05 13:07:37,004 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:07:37,004 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1675415610] [2021-06-05 13:07:37,004 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1675415610] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:07:37,004 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1934494826] [2021-06-05 13:07:37,004 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) [2021-06-05 13:07:37,034 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-06-05 13:07:37,034 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 13:07:37,035 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 12 conjunts are in the unsatisfiable core Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-05 13:07:37,035 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:07:37,169 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:07:37,170 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1934494826] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:07:37,170 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:07:37,170 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11] total 20 [2021-06-05 13:07:37,170 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1564810513] [2021-06-05 13:07:37,170 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-06-05 13:07:37,170 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:07:37,170 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-06-05 13:07:37,170 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=391, Unknown=0, NotChecked=0, Total=462 [2021-06-05 13:07:37,171 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) [2021-06-05 13:07:37,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:07:37,928 INFO L93 Difference]: Finished difference Result 2318 states and 6089 transitions. [2021-06-05 13:07:37,928 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-06-05 13:07:37,928 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 [2021-06-05 13:07:37,928 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:07:37,931 INFO L225 Difference]: With dead ends: 2318 [2021-06-05 13:07:37,931 INFO L226 Difference]: Without dead ends: 1995 [2021-06-05 13:07:37,931 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 854 ImplicationChecksByTransitivity, 585.8ms TimeCoverageRelationStatistics Valid=865, Invalid=2675, Unknown=0, NotChecked=0, Total=3540 [2021-06-05 13:07:37,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1995 states. [2021-06-05 13:07:37,944 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1995 to 801. [2021-06-05 13:07:37,945 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) [2021-06-05 13:07:37,946 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 801 states to 801 states and 2194 transitions. [2021-06-05 13:07:37,946 INFO L78 Accepts]: Start accepts. Automaton has 801 states and 2194 transitions. Word has length 17 [2021-06-05 13:07:37,946 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:07:37,946 INFO L482 AbstractCegarLoop]: Abstraction has 801 states and 2194 transitions. [2021-06-05 13:07:37,946 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) [2021-06-05 13:07:37,946 INFO L276 IsEmpty]: Start isEmpty. Operand 801 states and 2194 transitions. [2021-06-05 13:07:37,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-06-05 13:07:37,946 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:07:37,946 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:07:38,150 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2021-06-05 13:07:38,150 INFO L430 AbstractCegarLoop]: === Iteration 32 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:07:38,150 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:07:38,150 INFO L82 PathProgramCache]: Analyzing trace with hash 188226847, now seen corresponding path program 18 times [2021-06-05 13:07:38,151 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:07:38,151 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [479455779] [2021-06-05 13:07:38,151 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:07:38,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:07:38,198 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-06-05 13:07:38,198 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:07:38,198 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [479455779] [2021-06-05 13:07:38,198 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [479455779] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:07:38,198 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1945744593] [2021-06-05 13:07:38,198 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 [2021-06-05 13:07:38,217 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-06-05 13:07:38,217 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 13:07:38,217 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 12 conjunts are in the unsatisfiable core [2021-06-05 13:07:38,218 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:07:38,351 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:07:38,351 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1945744593] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:07:38,351 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:07:38,351 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11] total 20 [2021-06-05 13:07:38,351 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [28406586] [2021-06-05 13:07:38,352 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-06-05 13:07:38,352 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:07:38,352 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-06-05 13:07:38,352 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=396, Unknown=0, NotChecked=0, Total=462 [2021-06-05 13:07:38,352 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) [2021-06-05 13:07:39,202 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:07:39,202 INFO L93 Difference]: Finished difference Result 2435 states and 6205 transitions. [2021-06-05 13:07:39,202 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-06-05 13:07:39,202 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 [2021-06-05 13:07:39,202 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:07:39,204 INFO L225 Difference]: With dead ends: 2435 [2021-06-05 13:07:39,204 INFO L226 Difference]: Without dead ends: 1818 [2021-06-05 13:07:39,205 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1071 ImplicationChecksByTransitivity, 695.0ms TimeCoverageRelationStatistics Valid=1113, Invalid=3047, Unknown=0, NotChecked=0, Total=4160 [2021-06-05 13:07:39,208 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1818 states. [2021-06-05 13:07:39,216 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1818 to 768. [2021-06-05 13:07:39,217 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) [2021-06-05 13:07:39,217 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 768 states to 768 states and 2118 transitions. [2021-06-05 13:07:39,218 INFO L78 Accepts]: Start accepts. Automaton has 768 states and 2118 transitions. Word has length 17 [2021-06-05 13:07:39,218 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:07:39,218 INFO L482 AbstractCegarLoop]: Abstraction has 768 states and 2118 transitions. [2021-06-05 13:07:39,218 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) [2021-06-05 13:07:39,218 INFO L276 IsEmpty]: Start isEmpty. Operand 768 states and 2118 transitions. [2021-06-05 13:07:39,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-06-05 13:07:39,218 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:07:39,218 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:07:39,418 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable40 [2021-06-05 13:07:39,419 INFO L430 AbstractCegarLoop]: === Iteration 33 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:07:39,419 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:07:39,419 INFO L82 PathProgramCache]: Analyzing trace with hash -239866301, now seen corresponding path program 19 times [2021-06-05 13:07:39,419 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:07:39,419 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1952592383] [2021-06-05 13:07:39,419 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:07:39,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:07:39,463 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-06-05 13:07:39,463 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:07:39,463 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1952592383] [2021-06-05 13:07:39,463 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1952592383] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:07:39,463 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1350576707] [2021-06-05 13:07:39,464 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 [2021-06-05 13:07:39,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:07:39,483 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 12 conjunts are in the unsatisfiable core [2021-06-05 13:07:39,483 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:07:39,592 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:07:39,592 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1350576707] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:07:39,592 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:07:39,592 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 19 [2021-06-05 13:07:39,592 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [865770717] [2021-06-05 13:07:39,593 INFO L462 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-06-05 13:07:39,593 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:07:39,593 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-06-05 13:07:39,593 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=352, Unknown=0, NotChecked=0, Total=420 [2021-06-05 13:07:39,593 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) [2021-06-05 13:07:40,298 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:07:40,299 INFO L93 Difference]: Finished difference Result 2017 states and 5048 transitions. [2021-06-05 13:07:40,299 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-06-05 13:07:40,300 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 [2021-06-05 13:07:40,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:07:40,301 INFO L225 Difference]: With dead ends: 2017 [2021-06-05 13:07:40,301 INFO L226 Difference]: Without dead ends: 1544 [2021-06-05 13:07:40,302 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 853 ImplicationChecksByTransitivity, 509.5ms TimeCoverageRelationStatistics Valid=821, Invalid=2719, Unknown=0, NotChecked=0, Total=3540 [2021-06-05 13:07:40,305 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1544 states. [2021-06-05 13:07:40,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1544 to 726. [2021-06-05 13:07:40,312 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) [2021-06-05 13:07:40,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 726 states to 726 states and 2017 transitions. [2021-06-05 13:07:40,313 INFO L78 Accepts]: Start accepts. Automaton has 726 states and 2017 transitions. Word has length 17 [2021-06-05 13:07:40,313 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:07:40,313 INFO L482 AbstractCegarLoop]: Abstraction has 726 states and 2017 transitions. [2021-06-05 13:07:40,313 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) [2021-06-05 13:07:40,313 INFO L276 IsEmpty]: Start isEmpty. Operand 726 states and 2017 transitions. [2021-06-05 13:07:40,314 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-06-05 13:07:40,314 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:07:40,314 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:07:40,518 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable41 [2021-06-05 13:07:40,518 INFO L430 AbstractCegarLoop]: === Iteration 34 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:07:40,518 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:07:40,518 INFO L82 PathProgramCache]: Analyzing trace with hash -105915949, now seen corresponding path program 20 times [2021-06-05 13:07:40,518 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:07:40,519 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1643502090] [2021-06-05 13:07:40,519 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:07:40,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:07:40,565 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-06-05 13:07:40,565 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:07:40,566 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1643502090] [2021-06-05 13:07:40,566 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1643502090] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:07:40,566 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [167937739] [2021-06-05 13:07:40,566 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 [2021-06-05 13:07:40,594 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-06-05 13:07:40,594 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 13:07:40,594 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 12 conjunts are in the unsatisfiable core [2021-06-05 13:07:40,594 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:07:40,712 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:07:40,712 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [167937739] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:07:40,712 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:07:40,712 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11] total 20 [2021-06-05 13:07:40,712 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1399425417] [2021-06-05 13:07:40,712 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-06-05 13:07:40,712 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:07:40,713 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-06-05 13:07:40,713 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=391, Unknown=0, NotChecked=0, Total=462 [2021-06-05 13:07:40,713 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) [2021-06-05 13:07:41,284 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:07:41,284 INFO L93 Difference]: Finished difference Result 1658 states and 4211 transitions. [2021-06-05 13:07:41,284 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-06-05 13:07:41,284 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 [2021-06-05 13:07:41,284 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:07:41,286 INFO L225 Difference]: With dead ends: 1658 [2021-06-05 13:07:41,286 INFO L226 Difference]: Without dead ends: 1346 [2021-06-05 13:07:41,286 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 530 ImplicationChecksByTransitivity, 442.3ms TimeCoverageRelationStatistics Valid=543, Invalid=1809, Unknown=0, NotChecked=0, Total=2352 [2021-06-05 13:07:41,289 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1346 states. [2021-06-05 13:07:41,295 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1346 to 714. [2021-06-05 13:07:41,296 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) [2021-06-05 13:07:41,297 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 714 states to 714 states and 1961 transitions. [2021-06-05 13:07:41,297 INFO L78 Accepts]: Start accepts. Automaton has 714 states and 1961 transitions. Word has length 17 [2021-06-05 13:07:41,297 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:07:41,297 INFO L482 AbstractCegarLoop]: Abstraction has 714 states and 1961 transitions. [2021-06-05 13:07:41,297 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) [2021-06-05 13:07:41,297 INFO L276 IsEmpty]: Start isEmpty. Operand 714 states and 1961 transitions. [2021-06-05 13:07:41,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-06-05 13:07:41,297 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:07:41,297 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:07:41,497 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42,39 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-05 13:07:41,498 INFO L430 AbstractCegarLoop]: === Iteration 35 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:07:41,498 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:07:41,498 INFO L82 PathProgramCache]: Analyzing trace with hash 251279579, now seen corresponding path program 21 times [2021-06-05 13:07:41,498 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:07:41,498 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1052035346] [2021-06-05 13:07:41,498 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:07:41,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:07:41,547 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-06-05 13:07:41,548 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:07:41,548 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1052035346] [2021-06-05 13:07:41,548 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1052035346] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:07:41,548 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1863001065] [2021-06-05 13:07:41,548 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 [2021-06-05 13:07:41,566 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-06-05 13:07:41,567 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 13:07:41,567 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 12 conjunts are in the unsatisfiable core [2021-06-05 13:07:41,567 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:07:41,685 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:07:41,685 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1863001065] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:07:41,685 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:07:41,685 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11] total 20 [2021-06-05 13:07:41,685 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [674448812] [2021-06-05 13:07:41,685 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-06-05 13:07:41,685 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:07:41,686 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-06-05 13:07:41,686 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=386, Unknown=0, NotChecked=0, Total=462 [2021-06-05 13:07:41,686 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) [2021-06-05 13:07:42,165 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:07:42,166 INFO L93 Difference]: Finished difference Result 960 states and 2431 transitions. [2021-06-05 13:07:42,166 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-06-05 13:07:42,166 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 [2021-06-05 13:07:42,166 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:07:42,167 INFO L225 Difference]: With dead ends: 960 [2021-06-05 13:07:42,167 INFO L226 Difference]: Without dead ends: 648 [2021-06-05 13:07:42,167 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 430 ImplicationChecksByTransitivity, 368.9ms TimeCoverageRelationStatistics Valid=469, Invalid=1601, Unknown=0, NotChecked=0, Total=2070 [2021-06-05 13:07:42,169 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 648 states. [2021-06-05 13:07:42,172 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 648 to 504. [2021-06-05 13:07:42,173 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) [2021-06-05 13:07:42,173 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 504 states to 504 states and 1328 transitions. [2021-06-05 13:07:42,173 INFO L78 Accepts]: Start accepts. Automaton has 504 states and 1328 transitions. Word has length 17 [2021-06-05 13:07:42,173 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:07:42,173 INFO L482 AbstractCegarLoop]: Abstraction has 504 states and 1328 transitions. [2021-06-05 13:07:42,174 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) [2021-06-05 13:07:42,174 INFO L276 IsEmpty]: Start isEmpty. Operand 504 states and 1328 transitions. [2021-06-05 13:07:42,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-06-05 13:07:42,174 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:07:42,174 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:07:42,388 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable43 [2021-06-05 13:07:42,389 INFO L430 AbstractCegarLoop]: === Iteration 36 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:07:42,389 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:07:42,389 INFO L82 PathProgramCache]: Analyzing trace with hash -1871831335, now seen corresponding path program 22 times [2021-06-05 13:07:42,389 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:07:42,389 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1752533749] [2021-06-05 13:07:42,389 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:07:42,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:07:42,437 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-06-05 13:07:42,437 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:07:42,437 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1752533749] [2021-06-05 13:07:42,437 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1752533749] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:07:42,438 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1868798912] [2021-06-05 13:07:42,438 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 [2021-06-05 13:07:42,458 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-06-05 13:07:42,458 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 13:07:42,458 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 12 conjunts are in the unsatisfiable core [2021-06-05 13:07:42,459 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:07:42,591 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:07:42,591 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1868798912] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:07:42,591 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:07:42,591 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11] total 20 [2021-06-05 13:07:42,591 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1011046871] [2021-06-05 13:07:42,591 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-06-05 13:07:42,591 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:07:42,592 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-06-05 13:07:42,592 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=394, Unknown=0, NotChecked=0, Total=462 [2021-06-05 13:07:42,592 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) [2021-06-05 13:07:43,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:07:43,002 INFO L93 Difference]: Finished difference Result 452 states and 1063 transitions. [2021-06-05 13:07:43,002 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-06-05 13:07:43,002 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 [2021-06-05 13:07:43,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:07:43,003 INFO L225 Difference]: With dead ends: 452 [2021-06-05 13:07:43,003 INFO L226 Difference]: Without dead ends: 0 [2021-06-05 13:07:43,003 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 333 ImplicationChecksByTransitivity, 408.1ms TimeCoverageRelationStatistics Valid=423, Invalid=1383, Unknown=0, NotChecked=0, Total=1806 [2021-06-05 13:07:43,003 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-06-05 13:07:43,003 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-06-05 13:07:43,003 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) [2021-06-05 13:07:43,003 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-06-05 13:07:43,003 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 17 [2021-06-05 13:07:43,003 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:07:43,003 INFO L482 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-06-05 13:07:43,003 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) [2021-06-05 13:07:43,003 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-06-05 13:07:43,003 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-06-05 13:07:43,204 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44,41 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-05 13:07:43,204 INFO L315 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE (1/2) [2021-06-05 13:07:43,204 INFO L255 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-06-05 13:07:43,205 INFO L378 AbstractCegarLoop]: Interprodecural is true [2021-06-05 13:07:43,205 INFO L379 AbstractCegarLoop]: Hoare is false [2021-06-05 13:07:43,205 INFO L380 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-06-05 13:07:43,205 INFO L381 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-06-05 13:07:43,205 INFO L382 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-06-05 13:07:43,205 INFO L383 AbstractCegarLoop]: Difference is false [2021-06-05 13:07:43,205 INFO L384 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-06-05 13:07:43,205 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == InUseError======== [2021-06-05 13:07:43,205 INFO L100 iNet2FiniteAutomaton]: Start petriNet2FiniteAutomaton. Operand has 32 places, 25 transitions, 71 flow [2021-06-05 13:07:43,247 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) [2021-06-05 13:07:43,249 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) [2021-06-05 13:07:43,250 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-06-05 13:07:43,250 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:07:43,250 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1] [2021-06-05 13:07:43,250 INFO L430 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION]=== [2021-06-05 13:07:43,250 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:07:43,250 INFO L82 PathProgramCache]: Analyzing trace with hash 1147361507, now seen corresponding path program 1 times [2021-06-05 13:07:43,250 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:07:43,250 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [627296344] [2021-06-05 13:07:43,251 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:07:43,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-06-05 13:07:43,253 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-06-05 13:07:43,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-06-05 13:07:43,255 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-06-05 13:07:43,257 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-06-05 13:07:43,257 INFO L622 BasicCegarLoop]: Counterexample might be feasible [2021-06-05 13:07:43,257 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2021-06-05 13:07:43,257 INFO L315 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2021-06-05 13:07:43,257 WARN L242 ceAbstractionStarter]: 3 thread instances were not sufficient, I will increase this number and restart the analysis [2021-06-05 13:07:43,257 INFO L510 ceAbstractionStarter]: Constructing petrified ICFG for 4 thread instances. [2021-06-05 13:07:43,261 WARN L313 ript$VariableManager]: TermVariabe threadThread3of4ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-05 13:07:43,261 WARN L313 ript$VariableManager]: TermVariabe threadThread3of4ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-05 13:07:43,261 WARN L313 ript$VariableManager]: TermVariabe threadThread3of4ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-05 13:07:43,261 WARN L313 ript$VariableManager]: TermVariabe threadThread3of4ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-05 13:07:43,261 WARN L313 ript$VariableManager]: TermVariabe threadThread1of4ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-05 13:07:43,261 WARN L313 ript$VariableManager]: TermVariabe threadThread1of4ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-05 13:07:43,261 WARN L313 ript$VariableManager]: TermVariabe threadThread1of4ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-05 13:07:43,261 WARN L313 ript$VariableManager]: TermVariabe threadThread1of4ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-05 13:07:43,262 WARN L313 ript$VariableManager]: TermVariabe threadThread2of4ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-05 13:07:43,262 WARN L313 ript$VariableManager]: TermVariabe threadThread2of4ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-05 13:07:43,262 WARN L313 ript$VariableManager]: TermVariabe threadThread2of4ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-05 13:07:43,262 WARN L313 ript$VariableManager]: TermVariabe threadThread2of4ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-05 13:07:43,262 WARN L313 ript$VariableManager]: TermVariabe threadThread4of4ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-05 13:07:43,262 WARN L313 ript$VariableManager]: TermVariabe threadThread4of4ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-05 13:07:43,262 WARN L313 ript$VariableManager]: TermVariabe threadThread4of4ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-05 13:07:43,262 WARN L313 ript$VariableManager]: TermVariabe threadThread4of4ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-05 13:07:43,262 WARN L313 ript$VariableManager]: TermVariabe threadThread1of4ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-05 13:07:43,263 WARN L313 ript$VariableManager]: TermVariabe threadThread2of4ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-05 13:07:43,264 WARN L313 ript$VariableManager]: TermVariabe threadThread3of4ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-05 13:07:43,264 WARN L313 ript$VariableManager]: TermVariabe threadThread4of4ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-05 13:07:43,265 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-06-05 13:07:43,265 INFO L255 AbstractCegarLoop]: Starting to check reachability of 5 error locations. [2021-06-05 13:07:43,266 INFO L378 AbstractCegarLoop]: Interprodecural is true [2021-06-05 13:07:43,266 INFO L379 AbstractCegarLoop]: Hoare is false [2021-06-05 13:07:43,266 INFO L380 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-06-05 13:07:43,266 INFO L381 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-06-05 13:07:43,266 INFO L382 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-06-05 13:07:43,266 INFO L383 AbstractCegarLoop]: Difference is false [2021-06-05 13:07:43,266 INFO L384 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-06-05 13:07:43,266 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-06-05 13:07:43,267 INFO L100 iNet2FiniteAutomaton]: Start petriNet2FiniteAutomaton. Operand has 40 places, 31 transitions, 94 flow [2021-06-05 13:07:43,719 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) [2021-06-05 13:07:43,734 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) [2021-06-05 13:07:43,734 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-06-05 13:07:43,734 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:07:43,734 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:07:43,734 INFO L430 AbstractCegarLoop]: === Iteration 1 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:07:43,735 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:07:43,735 INFO L82 PathProgramCache]: Analyzing trace with hash 331295731, now seen corresponding path program 1 times [2021-06-05 13:07:43,735 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:07:43,735 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1667394649] [2021-06-05 13:07:43,735 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:07:43,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:07:43,752 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:07:43,752 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:07:43,752 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1667394649] [2021-06-05 13:07:43,752 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1667394649] provided 1 perfect and 0 imperfect interpolant sequences [2021-06-05 13:07:43,752 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-06-05 13:07:43,753 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-06-05 13:07:43,753 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1971030788] [2021-06-05 13:07:43,753 INFO L462 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-06-05 13:07:43,753 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:07:43,753 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-06-05 13:07:43,753 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-06-05 13:07:43,768 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) [2021-06-05 13:07:44,042 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:07:44,043 INFO L93 Difference]: Finished difference Result 29977 states and 108006 transitions. [2021-06-05 13:07:44,044 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-06-05 13:07:44,044 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 [2021-06-05 13:07:44,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:07:44,115 INFO L225 Difference]: With dead ends: 29977 [2021-06-05 13:07:44,115 INFO L226 Difference]: Without dead ends: 28143 [2021-06-05 13:07:44,115 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 50.8ms TimeCoverageRelationStatistics Valid=72, Invalid=138, Unknown=0, NotChecked=0, Total=210 [2021-06-05 13:07:44,326 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28143 states. [2021-06-05 13:07:44,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28143 to 13687. [2021-06-05 13:07:44,581 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) [2021-06-05 13:07:44,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13687 states to 13687 states and 53529 transitions. [2021-06-05 13:07:44,726 INFO L78 Accepts]: Start accepts. Automaton has 13687 states and 53529 transitions. Word has length 7 [2021-06-05 13:07:44,726 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:07:44,726 INFO L482 AbstractCegarLoop]: Abstraction has 13687 states and 53529 transitions. [2021-06-05 13:07:44,727 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) [2021-06-05 13:07:44,727 INFO L276 IsEmpty]: Start isEmpty. Operand 13687 states and 53529 transitions. [2021-06-05 13:07:44,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-06-05 13:07:44,727 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:07:44,727 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:07:44,727 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2021-06-05 13:07:44,727 INFO L430 AbstractCegarLoop]: === Iteration 2 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:07:44,727 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:07:44,728 INFO L82 PathProgramCache]: Analyzing trace with hash -590120179, now seen corresponding path program 1 times [2021-06-05 13:07:44,728 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:07:44,728 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1523468325] [2021-06-05 13:07:44,728 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:07:44,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:07:44,744 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-06-05 13:07:44,744 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:07:44,744 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1523468325] [2021-06-05 13:07:44,744 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1523468325] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:07:44,745 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1570311009] [2021-06-05 13:07:44,745 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 [2021-06-05 13:07:44,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:07:44,764 INFO L263 TraceCheckSpWp]: Trace formula consists of 19 conjuncts, 7 conjunts are in the unsatisfiable core [2021-06-05 13:07:44,764 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:07:44,810 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:07:44,810 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1570311009] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:07:44,810 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:07:44,810 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6] total 10 [2021-06-05 13:07:44,810 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [343795735] [2021-06-05 13:07:44,810 INFO L462 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-06-05 13:07:44,810 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:07:44,811 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-06-05 13:07:44,811 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2021-06-05 13:07:44,811 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) [2021-06-05 13:07:45,229 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:07:45,229 INFO L93 Difference]: Finished difference Result 43039 states and 152646 transitions. [2021-06-05 13:07:45,229 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-06-05 13:07:45,229 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 [2021-06-05 13:07:45,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:07:45,338 INFO L225 Difference]: With dead ends: 43039 [2021-06-05 13:07:45,338 INFO L226 Difference]: Without dead ends: 42197 [2021-06-05 13:07:45,338 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 118.0ms TimeCoverageRelationStatistics Valid=149, Invalid=357, Unknown=0, NotChecked=0, Total=506 [2021-06-05 13:07:45,693 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42197 states. [2021-06-05 13:07:46,038 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42197 to 15660. [2021-06-05 13:07:46,058 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) [2021-06-05 13:07:46,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15660 states to 15660 states and 61370 transitions. [2021-06-05 13:07:46,105 INFO L78 Accepts]: Start accepts. Automaton has 15660 states and 61370 transitions. Word has length 10 [2021-06-05 13:07:46,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:07:46,105 INFO L482 AbstractCegarLoop]: Abstraction has 15660 states and 61370 transitions. [2021-06-05 13:07:46,105 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) [2021-06-05 13:07:46,105 INFO L276 IsEmpty]: Start isEmpty. Operand 15660 states and 61370 transitions. [2021-06-05 13:07:46,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-06-05 13:07:46,105 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:07:46,105 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:07:46,306 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2021-06-05 13:07:46,306 INFO L430 AbstractCegarLoop]: === Iteration 3 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:07:46,306 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:07:46,306 INFO L82 PathProgramCache]: Analyzing trace with hash 1450030414, now seen corresponding path program 1 times [2021-06-05 13:07:46,306 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:07:46,306 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [382342859] [2021-06-05 13:07:46,306 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:07:46,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:07:46,339 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-06-05 13:07:46,339 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:07:46,339 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [382342859] [2021-06-05 13:07:46,339 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [382342859] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:07:46,339 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1535264283] [2021-06-05 13:07:46,340 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 [2021-06-05 13:07:46,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:07:46,359 INFO L263 TraceCheckSpWp]: Trace formula consists of 23 conjuncts, 9 conjunts are in the unsatisfiable core [2021-06-05 13:07:46,360 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:07:46,445 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:07:46,445 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1535264283] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:07:46,446 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:07:46,446 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8] total 14 [2021-06-05 13:07:46,446 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [226262469] [2021-06-05 13:07:46,448 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-06-05 13:07:46,448 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:07:46,448 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-06-05 13:07:46,449 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-06-05 13:07:46,449 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) [2021-06-05 13:07:47,898 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:07:47,898 INFO L93 Difference]: Finished difference Result 96602 states and 330749 transitions. [2021-06-05 13:07:47,898 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-06-05 13:07:47,898 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 [2021-06-05 13:07:47,898 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:07:48,358 INFO L225 Difference]: With dead ends: 96602 [2021-06-05 13:07:48,358 INFO L226 Difference]: Without dead ends: 95787 [2021-06-05 13:07:48,359 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1457 ImplicationChecksByTransitivity, 654.4ms TimeCoverageRelationStatistics Valid=1000, Invalid=3160, Unknown=0, NotChecked=0, Total=4160 [2021-06-05 13:07:48,829 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95787 states. [2021-06-05 13:07:49,601 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95787 to 17113. [2021-06-05 13:07:49,624 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) [2021-06-05 13:07:49,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17113 states to 17113 states and 67902 transitions. [2021-06-05 13:07:49,676 INFO L78 Accepts]: Start accepts. Automaton has 17113 states and 67902 transitions. Word has length 12 [2021-06-05 13:07:49,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:07:49,676 INFO L482 AbstractCegarLoop]: Abstraction has 17113 states and 67902 transitions. [2021-06-05 13:07:49,676 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) [2021-06-05 13:07:49,676 INFO L276 IsEmpty]: Start isEmpty. Operand 17113 states and 67902 transitions. [2021-06-05 13:07:49,677 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-06-05 13:07:49,677 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:07:49,677 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:07:49,877 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48 [2021-06-05 13:07:49,877 INFO L430 AbstractCegarLoop]: === Iteration 4 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:07:49,878 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:07:49,878 INFO L82 PathProgramCache]: Analyzing trace with hash -169812180, now seen corresponding path program 2 times [2021-06-05 13:07:49,878 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:07:49,878 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1851332120] [2021-06-05 13:07:49,878 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:07:49,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:07:49,915 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:07:49,915 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:07:49,915 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1851332120] [2021-06-05 13:07:49,915 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1851332120] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:07:49,916 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1404102543] [2021-06-05 13:07:49,916 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 [2021-06-05 13:07:49,934 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-06-05 13:07:49,934 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 13:07:49,935 INFO L263 TraceCheckSpWp]: Trace formula consists of 23 conjuncts, 9 conjunts are in the unsatisfiable core [2021-06-05 13:07:49,935 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:07:50,010 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:07:50,010 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1404102543] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:07:50,010 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:07:50,010 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 15 [2021-06-05 13:07:50,010 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1509352604] [2021-06-05 13:07:50,010 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-06-05 13:07:50,010 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:07:50,011 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-06-05 13:07:50,011 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=220, Unknown=0, NotChecked=0, Total=272 [2021-06-05 13:07:50,011 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) [2021-06-05 13:07:50,474 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 19 [2021-06-05 13:07:51,422 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:07:51,422 INFO L93 Difference]: Finished difference Result 102029 states and 353544 transitions. [2021-06-05 13:07:51,423 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-06-05 13:07:51,423 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 [2021-06-05 13:07:51,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:07:51,716 INFO L225 Difference]: With dead ends: 102029 [2021-06-05 13:07:51,716 INFO L226 Difference]: Without dead ends: 100725 [2021-06-05 13:07:51,716 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1145 ImplicationChecksByTransitivity, 579.3ms TimeCoverageRelationStatistics Valid=883, Invalid=2657, Unknown=0, NotChecked=0, Total=3540 [2021-06-05 13:07:52,212 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100725 states. [2021-06-05 13:07:53,505 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100725 to 15782. [2021-06-05 13:07:53,526 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) [2021-06-05 13:07:53,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15782 states to 15782 states and 61569 transitions. [2021-06-05 13:07:53,569 INFO L78 Accepts]: Start accepts. Automaton has 15782 states and 61569 transitions. Word has length 12 [2021-06-05 13:07:53,569 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:07:53,569 INFO L482 AbstractCegarLoop]: Abstraction has 15782 states and 61569 transitions. [2021-06-05 13:07:53,569 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) [2021-06-05 13:07:53,569 INFO L276 IsEmpty]: Start isEmpty. Operand 15782 states and 61569 transitions. [2021-06-05 13:07:53,570 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-06-05 13:07:53,570 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:07:53,570 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:07:53,771 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2021-06-05 13:07:53,772 INFO L430 AbstractCegarLoop]: === Iteration 5 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:07:53,772 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:07:53,772 INFO L82 PathProgramCache]: Analyzing trace with hash -1503398707, now seen corresponding path program 1 times [2021-06-05 13:07:53,772 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:07:53,772 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [62413518] [2021-06-05 13:07:53,772 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:07:53,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:07:53,791 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-06-05 13:07:53,791 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:07:53,791 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [62413518] [2021-06-05 13:07:53,791 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [62413518] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:07:53,791 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [652509835] [2021-06-05 13:07:53,792 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 [2021-06-05 13:07:53,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:07:53,810 INFO L263 TraceCheckSpWp]: Trace formula consists of 24 conjuncts, 8 conjunts are in the unsatisfiable core [2021-06-05 13:07:53,810 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:07:53,867 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:07:53,867 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [652509835] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:07:53,867 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:07:53,867 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 7] total 11 [2021-06-05 13:07:53,867 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1839862147] [2021-06-05 13:07:53,867 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-06-05 13:07:53,867 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:07:53,868 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-06-05 13:07:53,868 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=117, Unknown=0, NotChecked=0, Total=156 [2021-06-05 13:07:53,868 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) [2021-06-05 13:07:54,432 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:07:54,433 INFO L93 Difference]: Finished difference Result 48279 states and 172275 transitions. [2021-06-05 13:07:54,433 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-06-05 13:07:54,433 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 [2021-06-05 13:07:54,433 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:07:54,555 INFO L225 Difference]: With dead ends: 48279 [2021-06-05 13:07:54,555 INFO L226 Difference]: Without dead ends: 47147 [2021-06-05 13:07:54,556 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 105 ImplicationChecksByTransitivity, 122.9ms TimeCoverageRelationStatistics Valid=172, Invalid=428, Unknown=0, NotChecked=0, Total=600 [2021-06-05 13:07:54,908 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47147 states. [2021-06-05 13:07:55,322 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47147 to 17412. [2021-06-05 13:07:55,344 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) [2021-06-05 13:07:55,391 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17412 states to 17412 states and 67925 transitions. [2021-06-05 13:07:55,391 INFO L78 Accepts]: Start accepts. Automaton has 17412 states and 67925 transitions. Word has length 13 [2021-06-05 13:07:55,391 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:07:55,391 INFO L482 AbstractCegarLoop]: Abstraction has 17412 states and 67925 transitions. [2021-06-05 13:07:55,391 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) [2021-06-05 13:07:55,391 INFO L276 IsEmpty]: Start isEmpty. Operand 17412 states and 67925 transitions. [2021-06-05 13:07:55,392 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-06-05 13:07:55,392 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:07:55,392 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:07:55,608 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable50 [2021-06-05 13:07:55,608 INFO L430 AbstractCegarLoop]: === Iteration 6 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:07:55,609 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:07:55,609 INFO L82 PathProgramCache]: Analyzing trace with hash -1459288340, now seen corresponding path program 1 times [2021-06-05 13:07:55,609 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:07:55,609 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1701425747] [2021-06-05 13:07:55,609 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:07:55,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:07:55,643 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-06-05 13:07:55,643 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:07:55,643 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1701425747] [2021-06-05 13:07:55,643 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1701425747] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:07:55,643 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1940136808] [2021-06-05 13:07:55,643 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 [2021-06-05 13:07:55,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:07:55,662 INFO L263 TraceCheckSpWp]: Trace formula consists of 28 conjuncts, 10 conjunts are in the unsatisfiable core [2021-06-05 13:07:55,663 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:07:55,755 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:07:55,755 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1940136808] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:07:55,756 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:07:55,756 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 16 [2021-06-05 13:07:55,756 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1572469218] [2021-06-05 13:07:55,756 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-06-05 13:07:55,756 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:07:55,756 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-06-05 13:07:55,756 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=246, Unknown=0, NotChecked=0, Total=306 [2021-06-05 13:07:55,756 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) [2021-06-05 13:07:57,119 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:07:57,120 INFO L93 Difference]: Finished difference Result 83381 states and 298658 transitions. [2021-06-05 13:07:57,120 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-06-05 13:07:57,120 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 [2021-06-05 13:07:57,120 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:07:57,552 INFO L225 Difference]: With dead ends: 83381 [2021-06-05 13:07:57,553 INFO L226 Difference]: Without dead ends: 82631 [2021-06-05 13:07:57,553 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 977 ImplicationChecksByTransitivity, 620.6ms TimeCoverageRelationStatistics Valid=823, Invalid=2717, Unknown=0, NotChecked=0, Total=3540 [2021-06-05 13:07:58,042 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82631 states. [2021-06-05 13:07:58,714 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82631 to 18374. [2021-06-05 13:07:58,737 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) [2021-06-05 13:07:58,786 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18374 states to 18374 states and 72208 transitions. [2021-06-05 13:07:58,786 INFO L78 Accepts]: Start accepts. Automaton has 18374 states and 72208 transitions. Word has length 15 [2021-06-05 13:07:58,786 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:07:58,786 INFO L482 AbstractCegarLoop]: Abstraction has 18374 states and 72208 transitions. [2021-06-05 13:07:58,786 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) [2021-06-05 13:07:58,786 INFO L276 IsEmpty]: Start isEmpty. Operand 18374 states and 72208 transitions. [2021-06-05 13:07:58,787 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-06-05 13:07:58,787 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:07:58,787 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:07:59,000 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51,46 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-05 13:07:59,001 INFO L430 AbstractCegarLoop]: === Iteration 7 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:07:59,001 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:07:59,001 INFO L82 PathProgramCache]: Analyzing trace with hash 210295032, now seen corresponding path program 1 times [2021-06-05 13:07:59,001 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:07:59,001 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [608551651] [2021-06-05 13:07:59,001 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:07:59,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:07:59,029 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-06-05 13:07:59,029 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:07:59,029 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [608551651] [2021-06-05 13:07:59,030 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [608551651] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:07:59,030 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1770587131] [2021-06-05 13:07:59,030 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 [2021-06-05 13:07:59,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:07:59,050 INFO L263 TraceCheckSpWp]: Trace formula consists of 28 conjuncts, 10 conjunts are in the unsatisfiable core [2021-06-05 13:07:59,050 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:07:59,132 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:07:59,132 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1770587131] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:07:59,132 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:07:59,132 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 15 [2021-06-05 13:07:59,132 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [577594822] [2021-06-05 13:07:59,133 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-06-05 13:07:59,133 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:07:59,133 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-06-05 13:07:59,133 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=219, Unknown=0, NotChecked=0, Total=272 [2021-06-05 13:07:59,133 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) [2021-06-05 13:07:59,819 WARN L205 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 19 [2021-06-05 13:08:00,616 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:08:00,616 INFO L93 Difference]: Finished difference Result 86468 states and 311613 transitions. [2021-06-05 13:08:00,639 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-06-05 13:08:00,640 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 [2021-06-05 13:08:00,640 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:08:00,872 INFO L225 Difference]: With dead ends: 86468 [2021-06-05 13:08:00,873 INFO L226 Difference]: Without dead ends: 85466 [2021-06-05 13:08:00,873 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 696 ImplicationChecksByTransitivity, 526.8ms TimeCoverageRelationStatistics Valid=625, Invalid=2027, Unknown=0, NotChecked=0, Total=2652 [2021-06-05 13:08:01,362 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85466 states. [2021-06-05 13:08:02,034 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85466 to 19632. [2021-06-05 13:08:02,058 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) [2021-06-05 13:08:02,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19632 states to 19632 states and 77933 transitions. [2021-06-05 13:08:02,111 INFO L78 Accepts]: Start accepts. Automaton has 19632 states and 77933 transitions. Word has length 15 [2021-06-05 13:08:02,111 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:08:02,111 INFO L482 AbstractCegarLoop]: Abstraction has 19632 states and 77933 transitions. [2021-06-05 13:08:02,111 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) [2021-06-05 13:08:02,111 INFO L276 IsEmpty]: Start isEmpty. Operand 19632 states and 77933 transitions. [2021-06-05 13:08:02,112 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-06-05 13:08:02,112 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:08:02,112 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:08:02,324 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable52 [2021-06-05 13:08:02,325 INFO L430 AbstractCegarLoop]: === Iteration 8 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:08:02,325 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:08:02,325 INFO L82 PathProgramCache]: Analyzing trace with hash -1657134634, now seen corresponding path program 2 times [2021-06-05 13:08:02,325 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:08:02,325 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [502471761] [2021-06-05 13:08:02,325 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:08:02,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:08:02,366 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:08:02,366 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:08:02,366 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [502471761] [2021-06-05 13:08:02,366 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [502471761] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:08:02,366 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [957562453] [2021-06-05 13:08:02,366 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 [2021-06-05 13:08:02,385 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-06-05 13:08:02,385 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 13:08:02,385 INFO L263 TraceCheckSpWp]: Trace formula consists of 28 conjuncts, 9 conjunts are in the unsatisfiable core [2021-06-05 13:08:02,385 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:08:02,462 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-06-05 13:08:02,462 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [957562453] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:08:02,462 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:08:02,462 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 16 [2021-06-05 13:08:02,462 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [442768708] [2021-06-05 13:08:02,462 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-06-05 13:08:02,462 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:08:02,463 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-06-05 13:08:02,463 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=255, Unknown=0, NotChecked=0, Total=306 [2021-06-05 13:08:02,463 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) [2021-06-05 13:08:03,609 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:08:03,609 INFO L93 Difference]: Finished difference Result 66483 states and 242457 transitions. [2021-06-05 13:08:03,610 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-06-05 13:08:03,610 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 [2021-06-05 13:08:03,610 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:08:03,787 INFO L225 Difference]: With dead ends: 66483 [2021-06-05 13:08:03,787 INFO L226 Difference]: Without dead ends: 64976 [2021-06-05 13:08:03,787 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 386 ImplicationChecksByTransitivity, 373.4ms TimeCoverageRelationStatistics Valid=513, Invalid=1467, Unknown=0, NotChecked=0, Total=1980 [2021-06-05 13:08:04,258 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64976 states. [2021-06-05 13:08:04,820 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64976 to 18426. [2021-06-05 13:08:04,844 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) [2021-06-05 13:08:05,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18426 states to 18426 states and 71899 transitions. [2021-06-05 13:08:05,049 INFO L78 Accepts]: Start accepts. Automaton has 18426 states and 71899 transitions. Word has length 15 [2021-06-05 13:08:05,049 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:08:05,049 INFO L482 AbstractCegarLoop]: Abstraction has 18426 states and 71899 transitions. [2021-06-05 13:08:05,049 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) [2021-06-05 13:08:05,049 INFO L276 IsEmpty]: Start isEmpty. Operand 18426 states and 71899 transitions. [2021-06-05 13:08:05,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-06-05 13:08:05,050 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:08:05,050 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:08:05,250 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53,48 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-05 13:08:05,250 INFO L430 AbstractCegarLoop]: === Iteration 9 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:08:05,250 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:08:05,251 INFO L82 PathProgramCache]: Analyzing trace with hash -1657139604, now seen corresponding path program 2 times [2021-06-05 13:08:05,251 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:08:05,251 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1686507731] [2021-06-05 13:08:05,251 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:08:05,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:08:05,289 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:08:05,289 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:08:05,289 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1686507731] [2021-06-05 13:08:05,289 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1686507731] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:08:05,290 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2141249071] [2021-06-05 13:08:05,290 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 [2021-06-05 13:08:05,309 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-06-05 13:08:05,309 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 13:08:05,310 INFO L263 TraceCheckSpWp]: Trace formula consists of 28 conjuncts, 9 conjunts are in the unsatisfiable core [2021-06-05 13:08:05,310 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:08:05,385 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-06-05 13:08:05,385 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2141249071] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:08:05,385 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:08:05,385 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 16 [2021-06-05 13:08:05,385 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1068153960] [2021-06-05 13:08:05,385 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-06-05 13:08:05,385 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:08:05,385 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-06-05 13:08:05,386 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=255, Unknown=0, NotChecked=0, Total=306 [2021-06-05 13:08:05,386 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) [2021-06-05 13:08:06,532 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:08:06,532 INFO L93 Difference]: Finished difference Result 68276 states and 248910 transitions. [2021-06-05 13:08:06,534 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-06-05 13:08:06,534 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 [2021-06-05 13:08:06,534 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:08:06,721 INFO L225 Difference]: With dead ends: 68276 [2021-06-05 13:08:06,721 INFO L226 Difference]: Without dead ends: 66663 [2021-06-05 13:08:06,722 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 391 ImplicationChecksByTransitivity, 379.5ms TimeCoverageRelationStatistics Valid=513, Invalid=1467, Unknown=0, NotChecked=0, Total=1980 [2021-06-05 13:08:06,988 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66663 states. [2021-06-05 13:08:07,595 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66663 to 17236. [2021-06-05 13:08:07,617 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) [2021-06-05 13:08:07,662 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17236 states to 17236 states and 66322 transitions. [2021-06-05 13:08:07,662 INFO L78 Accepts]: Start accepts. Automaton has 17236 states and 66322 transitions. Word has length 15 [2021-06-05 13:08:07,662 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:08:07,662 INFO L482 AbstractCegarLoop]: Abstraction has 17236 states and 66322 transitions. [2021-06-05 13:08:07,662 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) [2021-06-05 13:08:07,662 INFO L276 IsEmpty]: Start isEmpty. Operand 17236 states and 66322 transitions. [2021-06-05 13:08:07,664 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-06-05 13:08:07,664 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:08:07,664 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:08:07,880 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable54 [2021-06-05 13:08:07,880 INFO L430 AbstractCegarLoop]: === Iteration 10 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:08:07,880 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:08:07,880 INFO L82 PathProgramCache]: Analyzing trace with hash -70336879, now seen corresponding path program 1 times [2021-06-05 13:08:07,880 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:08:07,880 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1730594536] [2021-06-05 13:08:07,880 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:08:07,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:08:07,907 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-06-05 13:08:07,907 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:08:07,907 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1730594536] [2021-06-05 13:08:07,907 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1730594536] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:08:07,907 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1260180746] [2021-06-05 13:08:07,907 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 [2021-06-05 13:08:07,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:08:07,941 INFO L263 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 9 conjunts are in the unsatisfiable core [2021-06-05 13:08:07,942 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:08:08,005 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 12 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:08:08,005 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1260180746] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:08:08,005 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:08:08,005 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 8] total 12 [2021-06-05 13:08:08,005 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [965614844] [2021-06-05 13:08:08,006 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-06-05 13:08:08,006 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:08:08,006 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-06-05 13:08:08,006 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=136, Unknown=0, NotChecked=0, Total=182 [2021-06-05 13:08:08,006 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) [2021-06-05 13:08:08,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:08:08,634 INFO L93 Difference]: Finished difference Result 49321 states and 176968 transitions. [2021-06-05 13:08:08,640 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-06-05 13:08:08,641 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 [2021-06-05 13:08:08,641 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:08:08,781 INFO L225 Difference]: With dead ends: 49321 [2021-06-05 13:08:08,781 INFO L226 Difference]: Without dead ends: 47946 [2021-06-05 13:08:08,782 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 126 ImplicationChecksByTransitivity, 133.7ms TimeCoverageRelationStatistics Valid=198, Invalid=504, Unknown=0, NotChecked=0, Total=702 [2021-06-05 13:08:09,033 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47946 states. [2021-06-05 13:08:09,559 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47946 to 17908. [2021-06-05 13:08:09,581 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) [2021-06-05 13:08:09,630 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17908 states to 17908 states and 68687 transitions. [2021-06-05 13:08:09,630 INFO L78 Accepts]: Start accepts. Automaton has 17908 states and 68687 transitions. Word has length 16 [2021-06-05 13:08:09,630 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:08:09,630 INFO L482 AbstractCegarLoop]: Abstraction has 17908 states and 68687 transitions. [2021-06-05 13:08:09,630 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) [2021-06-05 13:08:09,630 INFO L276 IsEmpty]: Start isEmpty. Operand 17908 states and 68687 transitions. [2021-06-05 13:08:09,632 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-06-05 13:08:09,632 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:08:09,632 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:08:09,832 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable55 [2021-06-05 13:08:09,832 INFO L430 AbstractCegarLoop]: === Iteration 11 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:08:09,833 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:08:09,833 INFO L82 PathProgramCache]: Analyzing trace with hash -349315241, now seen corresponding path program 1 times [2021-06-05 13:08:09,833 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:08:09,833 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1184809299] [2021-06-05 13:08:09,833 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:08:09,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:08:09,872 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-06-05 13:08:09,873 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:08:09,873 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1184809299] [2021-06-05 13:08:09,873 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1184809299] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:08:09,873 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2035017516] [2021-06-05 13:08:09,873 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 [2021-06-05 13:08:09,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:08:09,893 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 12 conjunts are in the unsatisfiable core [2021-06-05 13:08:09,893 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:08:10,017 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:08:10,017 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2035017516] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:08:10,017 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:08:10,017 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 18 [2021-06-05 13:08:10,017 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [613845024] [2021-06-05 13:08:10,018 INFO L462 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-06-05 13:08:10,018 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:08:10,018 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-06-05 13:08:10,018 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=315, Unknown=0, NotChecked=0, Total=380 [2021-06-05 13:08:10,018 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) [2021-06-05 13:08:10,949 WARN L205 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2021-06-05 13:08:15,167 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:08:15,168 INFO L93 Difference]: Finished difference Result 228056 states and 752581 transitions. [2021-06-05 13:08:15,168 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 202 states. [2021-06-05 13:08:15,168 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 [2021-06-05 13:08:15,168 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:08:16,110 INFO L225 Difference]: With dead ends: 228056 [2021-06-05 13:08:16,110 INFO L226 Difference]: Without dead ends: 224200 [2021-06-05 13:08:16,112 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 223 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 214 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21581 ImplicationChecksByTransitivity, 2888.4ms TimeCoverageRelationStatistics Valid=7452, Invalid=38988, Unknown=0, NotChecked=0, Total=46440 [2021-06-05 13:08:17,471 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 224200 states. [2021-06-05 13:08:19,120 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 224200 to 19966. [2021-06-05 13:08:19,147 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) [2021-06-05 13:08:19,207 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19966 states to 19966 states and 77808 transitions. [2021-06-05 13:08:19,207 INFO L78 Accepts]: Start accepts. Automaton has 19966 states and 77808 transitions. Word has length 17 [2021-06-05 13:08:19,207 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:08:19,207 INFO L482 AbstractCegarLoop]: Abstraction has 19966 states and 77808 transitions. [2021-06-05 13:08:19,207 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) [2021-06-05 13:08:19,208 INFO L276 IsEmpty]: Start isEmpty. Operand 19966 states and 77808 transitions. [2021-06-05 13:08:19,209 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-06-05 13:08:19,209 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:08:19,209 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:08:19,410 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56,51 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-05 13:08:19,410 INFO L430 AbstractCegarLoop]: === Iteration 12 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:08:19,410 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:08:19,410 INFO L82 PathProgramCache]: Analyzing trace with hash 2078222389, now seen corresponding path program 2 times [2021-06-05 13:08:19,410 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:08:19,410 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [232374670] [2021-06-05 13:08:19,410 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:08:19,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:08:19,463 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-06-05 13:08:19,463 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:08:19,463 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [232374670] [2021-06-05 13:08:19,463 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [232374670] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:08:19,463 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1410683461] [2021-06-05 13:08:19,463 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 [2021-06-05 13:08:19,483 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-06-05 13:08:19,483 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 13:08:19,483 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 12 conjunts are in the unsatisfiable core [2021-06-05 13:08:19,483 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:08:19,614 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:08:19,614 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1410683461] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:08:19,614 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:08:19,614 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11] total 20 [2021-06-05 13:08:19,614 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1879169202] [2021-06-05 13:08:19,614 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-06-05 13:08:19,614 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:08:19,614 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-06-05 13:08:19,614 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=386, Unknown=0, NotChecked=0, Total=462 [2021-06-05 13:08:19,615 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) [2021-06-05 13:08:20,222 WARN L205 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 16 [2021-06-05 13:08:26,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:08:26,224 INFO L93 Difference]: Finished difference Result 244159 states and 816615 transitions. [2021-06-05 13:08:26,224 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 231 states. [2021-06-05 13:08:26,224 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 [2021-06-05 13:08:26,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:08:26,893 INFO L225 Difference]: With dead ends: 244159 [2021-06-05 13:08:26,893 INFO L226 Difference]: Without dead ends: 239586 [2021-06-05 13:08:26,895 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 253 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 246 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28048 ImplicationChecksByTransitivity, 3558.0ms TimeCoverageRelationStatistics Valid=9716, Invalid=51540, Unknown=0, NotChecked=0, Total=61256 [2021-06-05 13:08:28,217 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 239586 states. [2021-06-05 13:08:29,815 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 239586 to 19782. [2021-06-05 13:08:29,840 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) [2021-06-05 13:08:29,891 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19782 states to 19782 states and 76786 transitions. [2021-06-05 13:08:29,891 INFO L78 Accepts]: Start accepts. Automaton has 19782 states and 76786 transitions. Word has length 17 [2021-06-05 13:08:29,891 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:08:29,891 INFO L482 AbstractCegarLoop]: Abstraction has 19782 states and 76786 transitions. [2021-06-05 13:08:29,892 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) [2021-06-05 13:08:29,892 INFO L276 IsEmpty]: Start isEmpty. Operand 19782 states and 76786 transitions. [2021-06-05 13:08:29,893 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-06-05 13:08:29,893 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:08:29,893 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:08:30,094 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable57 [2021-06-05 13:08:30,094 INFO L430 AbstractCegarLoop]: === Iteration 13 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:08:30,094 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:08:30,094 INFO L82 PathProgramCache]: Analyzing trace with hash 1830826041, now seen corresponding path program 3 times [2021-06-05 13:08:30,094 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:08:30,094 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1778192465] [2021-06-05 13:08:30,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:08:30,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:08:30,133 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-06-05 13:08:30,133 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:08:30,133 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1778192465] [2021-06-05 13:08:30,134 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1778192465] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:08:30,134 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [103142108] [2021-06-05 13:08:30,134 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 [2021-06-05 13:08:30,154 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-06-05 13:08:30,154 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 13:08:30,154 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 12 conjunts are in the unsatisfiable core [2021-06-05 13:08:30,155 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:08:30,264 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:08:30,264 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [103142108] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:08:30,264 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:08:30,264 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 19 [2021-06-05 13:08:30,264 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1567427272] [2021-06-05 13:08:30,264 INFO L462 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-06-05 13:08:30,265 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:08:30,265 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-06-05 13:08:30,265 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=348, Unknown=0, NotChecked=0, Total=420 [2021-06-05 13:08:30,265 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) [2021-06-05 13:08:37,663 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:08:37,664 INFO L93 Difference]: Finished difference Result 278250 states and 927185 transitions. [2021-06-05 13:08:37,664 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 248 states. [2021-06-05 13:08:37,664 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 [2021-06-05 13:08:37,664 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:08:38,814 INFO L225 Difference]: With dead ends: 278250 [2021-06-05 13:08:38,814 INFO L226 Difference]: Without dead ends: 276089 [2021-06-05 13:08:38,816 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 269 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 261 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30298 ImplicationChecksByTransitivity, 3827.0ms TimeCoverageRelationStatistics Valid=10197, Invalid=58709, Unknown=0, NotChecked=0, Total=68906 [2021-06-05 13:08:40,222 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 276089 states. [2021-06-05 13:08:41,986 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 276089 to 19261. [2021-06-05 13:08:42,011 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) [2021-06-05 13:08:42,061 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19261 states to 19261 states and 74797 transitions. [2021-06-05 13:08:42,061 INFO L78 Accepts]: Start accepts. Automaton has 19261 states and 74797 transitions. Word has length 17 [2021-06-05 13:08:42,061 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:08:42,061 INFO L482 AbstractCegarLoop]: Abstraction has 19261 states and 74797 transitions. [2021-06-05 13:08:42,061 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) [2021-06-05 13:08:42,061 INFO L276 IsEmpty]: Start isEmpty. Operand 19261 states and 74797 transitions. [2021-06-05 13:08:42,063 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-06-05 13:08:42,063 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:08:42,063 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:08:42,263 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable58 [2021-06-05 13:08:42,264 INFO L430 AbstractCegarLoop]: === Iteration 14 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:08:42,264 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:08:42,264 INFO L82 PathProgramCache]: Analyzing trace with hash 230059607, now seen corresponding path program 4 times [2021-06-05 13:08:42,264 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:08:42,264 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1533682697] [2021-06-05 13:08:42,264 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:08:42,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:08:42,314 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-06-05 13:08:42,314 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:08:42,315 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1533682697] [2021-06-05 13:08:42,315 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1533682697] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:08:42,315 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1214772725] [2021-06-05 13:08:42,315 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 [2021-06-05 13:08:42,334 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-06-05 13:08:42,334 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 13:08:42,335 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 12 conjunts are in the unsatisfiable core [2021-06-05 13:08:42,335 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:08:42,446 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:08:42,446 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1214772725] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:08:42,446 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:08:42,446 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 19 [2021-06-05 13:08:42,446 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1111008741] [2021-06-05 13:08:42,446 INFO L462 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-06-05 13:08:42,446 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:08:42,446 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-06-05 13:08:42,446 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=351, Unknown=0, NotChecked=0, Total=420 [2021-06-05 13:08:42,447 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) [2021-06-05 13:08:43,010 WARN L205 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 15 [2021-06-05 13:08:47,153 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:08:47,153 INFO L93 Difference]: Finished difference Result 200419 states and 671992 transitions. [2021-06-05 13:08:47,154 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 151 states. [2021-06-05 13:08:47,154 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 [2021-06-05 13:08:47,154 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:08:47,693 INFO L225 Difference]: With dead ends: 200419 [2021-06-05 13:08:47,693 INFO L226 Difference]: Without dead ends: 196653 [2021-06-05 13:08:47,694 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 165 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11535 ImplicationChecksByTransitivity, 2095.8ms TimeCoverageRelationStatistics Valid=4766, Invalid=22956, Unknown=0, NotChecked=0, Total=27722 [2021-06-05 13:08:48,716 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196653 states. [2021-06-05 13:08:50,178 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196653 to 19057. [2021-06-05 13:08:50,201 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) [2021-06-05 13:08:50,251 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19057 states to 19057 states and 73806 transitions. [2021-06-05 13:08:50,251 INFO L78 Accepts]: Start accepts. Automaton has 19057 states and 73806 transitions. Word has length 17 [2021-06-05 13:08:50,252 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:08:50,252 INFO L482 AbstractCegarLoop]: Abstraction has 19057 states and 73806 transitions. [2021-06-05 13:08:50,252 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) [2021-06-05 13:08:50,252 INFO L276 IsEmpty]: Start isEmpty. Operand 19057 states and 73806 transitions. [2021-06-05 13:08:50,253 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-06-05 13:08:50,253 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:08:50,253 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:08:50,454 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable59 [2021-06-05 13:08:50,454 INFO L430 AbstractCegarLoop]: === Iteration 15 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:08:50,455 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:08:50,455 INFO L82 PathProgramCache]: Analyzing trace with hash 926480309, now seen corresponding path program 5 times [2021-06-05 13:08:50,455 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:08:50,455 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [552246432] [2021-06-05 13:08:50,455 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:08:50,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:08:50,509 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:08:50,509 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:08:50,509 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [552246432] [2021-06-05 13:08:50,509 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [552246432] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:08:50,509 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1693752899] [2021-06-05 13:08:50,509 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 [2021-06-05 13:08:50,528 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-06-05 13:08:50,528 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 13:08:50,528 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 12 conjunts are in the unsatisfiable core [2021-06-05 13:08:50,528 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:08:50,657 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:08:50,657 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1693752899] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:08:50,657 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:08:50,657 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 21 [2021-06-05 13:08:50,657 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [79731714] [2021-06-05 13:08:50,657 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-06-05 13:08:50,657 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:08:50,658 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-06-05 13:08:50,658 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=423, Unknown=0, NotChecked=0, Total=506 [2021-06-05 13:08:50,658 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) [2021-06-05 13:08:56,599 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:08:56,599 INFO L93 Difference]: Finished difference Result 228776 states and 761708 transitions. [2021-06-05 13:08:56,600 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 205 states. [2021-06-05 13:08:56,600 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 [2021-06-05 13:08:56,600 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:08:57,597 INFO L225 Difference]: With dead ends: 228776 [2021-06-05 13:08:57,598 INFO L226 Difference]: Without dead ends: 227342 [2021-06-05 13:08:57,600 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 228 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 222 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21981 ImplicationChecksByTransitivity, 2798.2ms TimeCoverageRelationStatistics Valid=8603, Invalid=41349, Unknown=0, NotChecked=0, Total=49952 [2021-06-05 13:08:58,727 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 227342 states. [2021-06-05 13:09:00,325 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 227342 to 17668. [2021-06-05 13:09:00,347 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) [2021-06-05 13:09:00,393 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17668 states to 17668 states and 67803 transitions. [2021-06-05 13:09:00,393 INFO L78 Accepts]: Start accepts. Automaton has 17668 states and 67803 transitions. Word has length 17 [2021-06-05 13:09:00,394 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:09:00,394 INFO L482 AbstractCegarLoop]: Abstraction has 17668 states and 67803 transitions. [2021-06-05 13:09:00,394 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) [2021-06-05 13:09:00,394 INFO L276 IsEmpty]: Start isEmpty. Operand 17668 states and 67803 transitions. [2021-06-05 13:09:00,395 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-06-05 13:09:00,395 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:09:00,395 INFO L521 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:09:00,596 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable60,55 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-05 13:09:00,597 INFO L430 AbstractCegarLoop]: === Iteration 16 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:09:00,597 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:09:00,597 INFO L82 PathProgramCache]: Analyzing trace with hash 921718709, now seen corresponding path program 6 times [2021-06-05 13:09:00,597 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:09:00,597 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2047483556] [2021-06-05 13:09:00,597 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:09:00,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:09:00,653 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:09:00,653 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:09:00,653 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2047483556] [2021-06-05 13:09:00,653 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2047483556] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:09:00,653 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [859957508] [2021-06-05 13:09:00,653 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 [2021-06-05 13:09:00,674 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-06-05 13:09:00,675 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 13:09:00,676 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 12 conjunts are in the unsatisfiable core [2021-06-05 13:09:00,676 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:09:00,793 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:09:00,793 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [859957508] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:09:00,793 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:09:00,794 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 21 [2021-06-05 13:09:00,794 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [472959762] [2021-06-05 13:09:00,794 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-06-05 13:09:00,794 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:09:00,794 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-06-05 13:09:00,794 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=423, Unknown=0, NotChecked=0, Total=506 [2021-06-05 13:09:00,794 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) [2021-06-05 13:09:07,362 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:09:07,362 INFO L93 Difference]: Finished difference Result 249619 states and 836495 transitions. [2021-06-05 13:09:07,363 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 203 states. [2021-06-05 13:09:07,363 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 [2021-06-05 13:09:07,363 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:09:08,069 INFO L225 Difference]: With dead ends: 249619 [2021-06-05 13:09:08,069 INFO L226 Difference]: Without dead ends: 246009 [2021-06-05 13:09:08,071 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 226 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 220 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20868 ImplicationChecksByTransitivity, 2815.0ms TimeCoverageRelationStatistics Valid=8539, Invalid=40523, Unknown=0, NotChecked=0, Total=49062 [2021-06-05 13:09:09,244 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 246009 states. [2021-06-05 13:09:10,874 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 246009 to 15661. [2021-06-05 13:09:10,893 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) [2021-06-05 13:09:10,933 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15661 states to 15661 states and 60367 transitions. [2021-06-05 13:09:10,933 INFO L78 Accepts]: Start accepts. Automaton has 15661 states and 60367 transitions. Word has length 17 [2021-06-05 13:09:10,933 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:09:10,933 INFO L482 AbstractCegarLoop]: Abstraction has 15661 states and 60367 transitions. [2021-06-05 13:09:10,933 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) [2021-06-05 13:09:10,933 INFO L276 IsEmpty]: Start isEmpty. Operand 15661 states and 60367 transitions. [2021-06-05 13:09:10,935 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-06-05 13:09:10,935 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:09:10,935 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:09:11,142 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable61,56 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-05 13:09:11,142 INFO L430 AbstractCegarLoop]: === Iteration 17 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:09:11,142 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:09:11,142 INFO L82 PathProgramCache]: Analyzing trace with hash -238386158, now seen corresponding path program 1 times [2021-06-05 13:09:11,142 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:09:11,142 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1463948592] [2021-06-05 13:09:11,142 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:09:11,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:09:11,177 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 10 proven. 3 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-06-05 13:09:11,177 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:09:11,177 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1463948592] [2021-06-05 13:09:11,178 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1463948592] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:09:11,178 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1165503657] [2021-06-05 13:09:11,178 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 [2021-06-05 13:09:11,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:09:11,197 INFO L263 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 11 conjunts are in the unsatisfiable core [2021-06-05 13:09:11,197 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:09:11,437 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:09:11,437 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1165503657] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:09:11,437 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:09:11,437 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10] total 18 [2021-06-05 13:09:11,437 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1855301789] [2021-06-05 13:09:11,438 INFO L462 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-06-05 13:09:11,438 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:09:11,438 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-06-05 13:09:11,438 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=305, Unknown=0, NotChecked=0, Total=380 [2021-06-05 13:09:11,438 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) [2021-06-05 13:09:12,613 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:09:12,613 INFO L93 Difference]: Finished difference Result 69283 states and 251093 transitions. [2021-06-05 13:09:12,613 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-06-05 13:09:12,613 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 [2021-06-05 13:09:12,614 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:09:12,795 INFO L225 Difference]: With dead ends: 69283 [2021-06-05 13:09:12,795 INFO L226 Difference]: Without dead ends: 68431 [2021-06-05 13:09:12,796 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1058 ImplicationChecksByTransitivity, 669.4ms TimeCoverageRelationStatistics Valid=895, Invalid=3011, Unknown=0, NotChecked=0, Total=3906 [2021-06-05 13:09:13,277 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68431 states. [2021-06-05 13:09:13,701 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68431 to 15474. [2021-06-05 13:09:13,720 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) [2021-06-05 13:09:13,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15474 states to 15474 states and 59388 transitions. [2021-06-05 13:09:13,759 INFO L78 Accepts]: Start accepts. Automaton has 15474 states and 59388 transitions. Word has length 18 [2021-06-05 13:09:13,759 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:09:13,759 INFO L482 AbstractCegarLoop]: Abstraction has 15474 states and 59388 transitions. [2021-06-05 13:09:13,759 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) [2021-06-05 13:09:13,759 INFO L276 IsEmpty]: Start isEmpty. Operand 15474 states and 59388 transitions. [2021-06-05 13:09:13,762 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-06-05 13:09:13,762 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:09:13,762 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:09:13,977 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable62,57 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-05 13:09:13,977 INFO L430 AbstractCegarLoop]: === Iteration 18 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:09:13,977 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:09:13,977 INFO L82 PathProgramCache]: Analyzing trace with hash -1696703797, now seen corresponding path program 1 times [2021-06-05 13:09:13,977 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:09:13,977 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [840348049] [2021-06-05 13:09:13,977 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:09:13,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:09:14,009 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 9 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-06-05 13:09:14,010 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:09:14,010 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [840348049] [2021-06-05 13:09:14,010 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [840348049] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:09:14,010 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1957466931] [2021-06-05 13:09:14,010 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 [2021-06-05 13:09:14,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:09:14,029 INFO L263 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 11 conjunts are in the unsatisfiable core [2021-06-05 13:09:14,029 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:09:14,125 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 4 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:09:14,125 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1957466931] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:09:14,125 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:09:14,125 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 10] total 17 [2021-06-05 13:09:14,125 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1069348371] [2021-06-05 13:09:14,125 INFO L462 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-06-05 13:09:14,125 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:09:14,125 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-06-05 13:09:14,125 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=277, Unknown=0, NotChecked=0, Total=342 [2021-06-05 13:09:14,125 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) [2021-06-05 13:09:15,373 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:09:15,373 INFO L93 Difference]: Finished difference Result 67183 states and 242227 transitions. [2021-06-05 13:09:15,373 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-06-05 13:09:15,374 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 [2021-06-05 13:09:15,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:09:15,554 INFO L225 Difference]: With dead ends: 67183 [2021-06-05 13:09:15,555 INFO L226 Difference]: Without dead ends: 65938 [2021-06-05 13:09:15,555 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 868 ImplicationChecksByTransitivity, 480.6ms TimeCoverageRelationStatistics Valid=773, Invalid=2533, Unknown=0, NotChecked=0, Total=3306 [2021-06-05 13:09:15,937 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65938 states. [2021-06-05 13:09:16,372 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65938 to 16194. [2021-06-05 13:09:16,393 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) [2021-06-05 13:09:16,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16194 states to 16194 states and 62331 transitions. [2021-06-05 13:09:16,435 INFO L78 Accepts]: Start accepts. Automaton has 16194 states and 62331 transitions. Word has length 18 [2021-06-05 13:09:16,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:09:16,435 INFO L482 AbstractCegarLoop]: Abstraction has 16194 states and 62331 transitions. [2021-06-05 13:09:16,435 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) [2021-06-05 13:09:16,435 INFO L276 IsEmpty]: Start isEmpty. Operand 16194 states and 62331 transitions. [2021-06-05 13:09:16,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-06-05 13:09:16,438 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:09:16,438 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:09:16,638 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable63,58 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-05 13:09:16,640 INFO L430 AbstractCegarLoop]: === Iteration 19 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:09:16,640 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:09:16,640 INFO L82 PathProgramCache]: Analyzing trace with hash -1878025230, now seen corresponding path program 1 times [2021-06-05 13:09:16,640 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:09:16,640 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1054343958] [2021-06-05 13:09:16,640 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:09:16,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:09:16,672 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 10 proven. 3 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-06-05 13:09:16,673 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:09:16,673 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1054343958] [2021-06-05 13:09:16,673 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1054343958] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:09:16,673 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2128662228] [2021-06-05 13:09:16,673 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 [2021-06-05 13:09:16,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:09:16,691 INFO L263 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 11 conjunts are in the unsatisfiable core [2021-06-05 13:09:16,692 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:09:16,788 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:09:16,788 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2128662228] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:09:16,788 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:09:16,788 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 10] total 17 [2021-06-05 13:09:16,788 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1659132345] [2021-06-05 13:09:16,789 INFO L462 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-06-05 13:09:16,789 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:09:16,789 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-06-05 13:09:16,789 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2021-06-05 13:09:16,789 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) [2021-06-05 13:09:17,990 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:09:17,990 INFO L93 Difference]: Finished difference Result 64746 states and 234169 transitions. [2021-06-05 13:09:17,990 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-06-05 13:09:17,990 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 [2021-06-05 13:09:17,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:09:18,163 INFO L225 Difference]: With dead ends: 64746 [2021-06-05 13:09:18,163 INFO L226 Difference]: Without dead ends: 63051 [2021-06-05 13:09:18,164 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 633 ImplicationChecksByTransitivity, 390.4ms TimeCoverageRelationStatistics Valid=620, Invalid=1930, Unknown=0, NotChecked=0, Total=2550 [2021-06-05 13:09:18,408 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63051 states. [2021-06-05 13:09:19,028 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63051 to 17049. [2021-06-05 13:09:19,050 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) [2021-06-05 13:09:19,095 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17049 states to 17049 states and 66104 transitions. [2021-06-05 13:09:19,095 INFO L78 Accepts]: Start accepts. Automaton has 17049 states and 66104 transitions. Word has length 18 [2021-06-05 13:09:19,095 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:09:19,095 INFO L482 AbstractCegarLoop]: Abstraction has 17049 states and 66104 transitions. [2021-06-05 13:09:19,095 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) [2021-06-05 13:09:19,095 INFO L276 IsEmpty]: Start isEmpty. Operand 17049 states and 66104 transitions. [2021-06-05 13:09:19,098 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-06-05 13:09:19,098 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:09:19,098 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:09:19,299 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 59 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable64 [2021-06-05 13:09:19,299 INFO L430 AbstractCegarLoop]: === Iteration 20 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:09:19,299 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:09:19,299 INFO L82 PathProgramCache]: Analyzing trace with hash 1125732939, now seen corresponding path program 2 times [2021-06-05 13:09:19,299 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:09:19,299 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [56199744] [2021-06-05 13:09:19,299 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:09:19,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:09:19,342 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 12 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:09:19,342 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:09:19,342 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [56199744] [2021-06-05 13:09:19,342 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [56199744] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:09:19,342 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [978727919] [2021-06-05 13:09:19,342 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 [2021-06-05 13:09:19,362 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-06-05 13:09:19,363 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 13:09:19,363 INFO L263 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 9 conjunts are in the unsatisfiable core [2021-06-05 13:09:19,363 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:09:19,443 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 1 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-06-05 13:09:19,443 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [978727919] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:09:19,443 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:09:19,443 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8] total 17 [2021-06-05 13:09:19,443 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [736681370] [2021-06-05 13:09:19,443 INFO L462 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-06-05 13:09:19,443 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:09:19,444 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-06-05 13:09:19,444 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=288, Unknown=0, NotChecked=0, Total=342 [2021-06-05 13:09:19,444 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) [2021-06-05 13:09:21,076 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:09:21,076 INFO L93 Difference]: Finished difference Result 76150 states and 277397 transitions. [2021-06-05 13:09:21,077 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-06-05 13:09:21,077 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 [2021-06-05 13:09:21,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:09:21,272 INFO L225 Difference]: With dead ends: 76150 [2021-06-05 13:09:21,273 INFO L226 Difference]: Without dead ends: 74224 [2021-06-05 13:09:21,273 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 840 ImplicationChecksByTransitivity, 546.3ms TimeCoverageRelationStatistics Valid=864, Invalid=2676, Unknown=0, NotChecked=0, Total=3540 [2021-06-05 13:09:21,540 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74224 states. [2021-06-05 13:09:22,206 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74224 to 15872. [2021-06-05 13:09:22,225 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) [2021-06-05 13:09:22,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15872 states to 15872 states and 60982 transitions. [2021-06-05 13:09:22,265 INFO L78 Accepts]: Start accepts. Automaton has 15872 states and 60982 transitions. Word has length 18 [2021-06-05 13:09:22,265 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:09:22,265 INFO L482 AbstractCegarLoop]: Abstraction has 15872 states and 60982 transitions. [2021-06-05 13:09:22,265 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) [2021-06-05 13:09:22,265 INFO L276 IsEmpty]: Start isEmpty. Operand 15872 states and 60982 transitions. [2021-06-05 13:09:22,268 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-06-05 13:09:22,268 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:09:22,268 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:09:22,471 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable65,60 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-05 13:09:22,471 INFO L430 AbstractCegarLoop]: === Iteration 21 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:09:22,471 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:09:22,471 INFO L82 PathProgramCache]: Analyzing trace with hash 1125723024, now seen corresponding path program 2 times [2021-06-05 13:09:22,472 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:09:22,472 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1452788053] [2021-06-05 13:09:22,472 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:09:22,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:09:22,525 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 12 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:09:22,525 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:09:22,526 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1452788053] [2021-06-05 13:09:22,526 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1452788053] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:09:22,526 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [96153885] [2021-06-05 13:09:22,526 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 [2021-06-05 13:09:22,545 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-06-05 13:09:22,545 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 13:09:22,545 INFO L263 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 9 conjunts are in the unsatisfiable core [2021-06-05 13:09:22,545 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:09:22,639 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 1 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-06-05 13:09:22,639 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [96153885] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:09:22,639 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:09:22,639 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8] total 17 [2021-06-05 13:09:22,640 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1737595720] [2021-06-05 13:09:22,640 INFO L462 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-06-05 13:09:22,640 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:09:22,640 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-06-05 13:09:22,640 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=288, Unknown=0, NotChecked=0, Total=342 [2021-06-05 13:09:22,640 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) [2021-06-05 13:09:23,537 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:09:23,537 INFO L93 Difference]: Finished difference Result 46458 states and 169742 transitions. [2021-06-05 13:09:23,537 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-06-05 13:09:23,537 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 [2021-06-05 13:09:23,537 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:09:23,855 INFO L225 Difference]: With dead ends: 46458 [2021-06-05 13:09:23,855 INFO L226 Difference]: Without dead ends: 44556 [2021-06-05 13:09:23,856 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 359 ImplicationChecksByTransitivity, 366.3ms TimeCoverageRelationStatistics Valid=483, Invalid=1409, Unknown=0, NotChecked=0, Total=1892 [2021-06-05 13:09:24,027 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44556 states. [2021-06-05 13:09:24,344 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44556 to 14808. [2021-06-05 13:09:24,362 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) [2021-06-05 13:09:24,400 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14808 states to 14808 states and 56025 transitions. [2021-06-05 13:09:24,400 INFO L78 Accepts]: Start accepts. Automaton has 14808 states and 56025 transitions. Word has length 18 [2021-06-05 13:09:24,400 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:09:24,400 INFO L482 AbstractCegarLoop]: Abstraction has 14808 states and 56025 transitions. [2021-06-05 13:09:24,400 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) [2021-06-05 13:09:24,400 INFO L276 IsEmpty]: Start isEmpty. Operand 14808 states and 56025 transitions. [2021-06-05 13:09:24,403 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-06-05 13:09:24,404 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:09:24,404 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:09:24,604 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 61 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable66 [2021-06-05 13:09:24,604 INFO L430 AbstractCegarLoop]: === Iteration 22 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:09:24,604 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:09:24,604 INFO L82 PathProgramCache]: Analyzing trace with hash 1125727984, now seen corresponding path program 2 times [2021-06-05 13:09:24,605 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:09:24,605 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [569806964] [2021-06-05 13:09:24,605 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:09:24,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:09:24,650 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 12 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:09:24,650 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:09:24,650 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [569806964] [2021-06-05 13:09:24,650 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [569806964] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:09:24,650 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1675100337] [2021-06-05 13:09:24,650 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 [2021-06-05 13:09:24,669 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-06-05 13:09:24,669 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 13:09:24,669 INFO L263 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 9 conjunts are in the unsatisfiable core [2021-06-05 13:09:24,670 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:09:24,765 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 1 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-06-05 13:09:24,765 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1675100337] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:09:24,765 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:09:24,765 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8] total 17 [2021-06-05 13:09:24,765 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [384423313] [2021-06-05 13:09:24,765 INFO L462 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-06-05 13:09:24,765 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:09:24,766 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-06-05 13:09:24,766 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=288, Unknown=0, NotChecked=0, Total=342 [2021-06-05 13:09:24,766 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) [2021-06-05 13:09:26,372 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:09:26,372 INFO L93 Difference]: Finished difference Result 64597 states and 232784 transitions. [2021-06-05 13:09:26,372 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-06-05 13:09:26,372 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 [2021-06-05 13:09:26,372 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:09:26,538 INFO L225 Difference]: With dead ends: 64597 [2021-06-05 13:09:26,539 INFO L226 Difference]: Without dead ends: 62791 [2021-06-05 13:09:26,539 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 851 ImplicationChecksByTransitivity, 550.2ms TimeCoverageRelationStatistics Valid=864, Invalid=2676, Unknown=0, NotChecked=0, Total=3540 [2021-06-05 13:09:26,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62791 states. [2021-06-05 13:09:27,352 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62791 to 13749. [2021-06-05 13:09:27,368 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) [2021-06-05 13:09:27,402 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13749 states to 13749 states and 51651 transitions. [2021-06-05 13:09:27,403 INFO L78 Accepts]: Start accepts. Automaton has 13749 states and 51651 transitions. Word has length 18 [2021-06-05 13:09:27,403 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:09:27,403 INFO L482 AbstractCegarLoop]: Abstraction has 13749 states and 51651 transitions. [2021-06-05 13:09:27,403 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) [2021-06-05 13:09:27,403 INFO L276 IsEmpty]: Start isEmpty. Operand 13749 states and 51651 transitions. [2021-06-05 13:09:27,408 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-06-05 13:09:27,408 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:09:27,408 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:09:27,610 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable67,62 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-05 13:09:27,610 INFO L430 AbstractCegarLoop]: === Iteration 23 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:09:27,611 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:09:27,611 INFO L82 PathProgramCache]: Analyzing trace with hash 16696332, now seen corresponding path program 1 times [2021-06-05 13:09:27,611 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:09:27,611 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [817805405] [2021-06-05 13:09:27,611 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:09:27,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:09:27,649 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-06-05 13:09:27,649 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:09:27,649 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [817805405] [2021-06-05 13:09:27,649 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [817805405] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:09:27,649 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1462295367] [2021-06-05 13:09:27,649 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 [2021-06-05 13:09:27,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:09:27,672 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 13 conjunts are in the unsatisfiable core [2021-06-05 13:09:27,672 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:09:27,795 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 2 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:09:27,795 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1462295367] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:09:27,795 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:09:27,795 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 12] total 20 [2021-06-05 13:09:27,795 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [469770793] [2021-06-05 13:09:27,795 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-06-05 13:09:27,795 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:09:27,795 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-06-05 13:09:27,796 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=385, Unknown=0, NotChecked=0, Total=462 [2021-06-05 13:09:27,796 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) [2021-06-05 13:09:29,129 WARN L205 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 14 [2021-06-05 13:09:32,211 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:09:32,211 INFO L93 Difference]: Finished difference Result 124064 states and 422755 transitions. [2021-06-05 13:09:32,212 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 162 states. [2021-06-05 13:09:32,212 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 [2021-06-05 13:09:32,212 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:09:32,530 INFO L225 Difference]: With dead ends: 124064 [2021-06-05 13:09:32,530 INFO L226 Difference]: Without dead ends: 120743 [2021-06-05 13:09:32,531 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 187 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 176 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12591 ImplicationChecksByTransitivity, 2505.9ms TimeCoverageRelationStatistics Valid=4885, Invalid=26621, Unknown=0, NotChecked=0, Total=31506 [2021-06-05 13:09:33,162 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120743 states. [2021-06-05 13:09:34,076 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120743 to 14593. [2021-06-05 13:09:34,090 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) [2021-06-05 13:09:34,125 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14593 states to 14593 states and 54938 transitions. [2021-06-05 13:09:34,126 INFO L78 Accepts]: Start accepts. Automaton has 14593 states and 54938 transitions. Word has length 20 [2021-06-05 13:09:34,126 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:09:34,126 INFO L482 AbstractCegarLoop]: Abstraction has 14593 states and 54938 transitions. [2021-06-05 13:09:34,126 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) [2021-06-05 13:09:34,126 INFO L276 IsEmpty]: Start isEmpty. Operand 14593 states and 54938 transitions. [2021-06-05 13:09:34,131 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-06-05 13:09:34,131 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:09:34,131 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:09:34,332 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 63 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable68 [2021-06-05 13:09:34,332 INFO L430 AbstractCegarLoop]: === Iteration 24 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:09:34,332 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:09:34,332 INFO L82 PathProgramCache]: Analyzing trace with hash -164625101, now seen corresponding path program 1 times [2021-06-05 13:09:34,332 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:09:34,332 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1337156760] [2021-06-05 13:09:34,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:09:34,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:09:34,371 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 8 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-06-05 13:09:34,371 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:09:34,371 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1337156760] [2021-06-05 13:09:34,371 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1337156760] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:09:34,371 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [180871060] [2021-06-05 13:09:34,371 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 [2021-06-05 13:09:34,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:09:34,392 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 13 conjunts are in the unsatisfiable core [2021-06-05 13:09:34,392 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:09:34,520 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:09:34,521 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [180871060] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:09:34,521 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:09:34,521 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 12] total 20 [2021-06-05 13:09:34,521 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1815111672] [2021-06-05 13:09:34,521 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-06-05 13:09:34,521 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:09:34,521 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-06-05 13:09:34,521 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=383, Unknown=0, NotChecked=0, Total=462 [2021-06-05 13:09:34,521 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) [2021-06-05 13:09:38,438 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:09:38,438 INFO L93 Difference]: Finished difference Result 115370 states and 392053 transitions. [2021-06-05 13:09:38,443 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 144 states. [2021-06-05 13:09:38,443 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 [2021-06-05 13:09:38,443 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:09:38,907 INFO L225 Difference]: With dead ends: 115370 [2021-06-05 13:09:38,907 INFO L226 Difference]: Without dead ends: 111959 [2021-06-05 13:09:38,908 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 158 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9896 ImplicationChecksByTransitivity, 2110.3ms TimeCoverageRelationStatistics Valid=3915, Invalid=21525, Unknown=0, NotChecked=0, Total=25440 [2021-06-05 13:09:39,313 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111959 states. [2021-06-05 13:09:40,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111959 to 15307. [2021-06-05 13:09:40,195 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) [2021-06-05 13:09:40,232 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15307 states to 15307 states and 58114 transitions. [2021-06-05 13:09:40,232 INFO L78 Accepts]: Start accepts. Automaton has 15307 states and 58114 transitions. Word has length 20 [2021-06-05 13:09:40,233 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:09:40,233 INFO L482 AbstractCegarLoop]: Abstraction has 15307 states and 58114 transitions. [2021-06-05 13:09:40,233 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) [2021-06-05 13:09:40,233 INFO L276 IsEmpty]: Start isEmpty. Operand 15307 states and 58114 transitions. [2021-06-05 13:09:40,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-06-05 13:09:40,239 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:09:40,239 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:09:40,439 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable69,64 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-05 13:09:40,439 INFO L430 AbstractCegarLoop]: === Iteration 25 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:09:40,439 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:09:40,439 INFO L82 PathProgramCache]: Analyzing trace with hash -1455834228, now seen corresponding path program 2 times [2021-06-05 13:09:40,439 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:09:40,440 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [595944343] [2021-06-05 13:09:40,440 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:09:40,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:09:40,501 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 10 proven. 3 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-06-05 13:09:40,501 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:09:40,501 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [595944343] [2021-06-05 13:09:40,501 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [595944343] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:09:40,501 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [819078007] [2021-06-05 13:09:40,501 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 [2021-06-05 13:09:40,528 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-06-05 13:09:40,528 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 13:09:40,529 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 12 conjunts are in the unsatisfiable core [2021-06-05 13:09:40,529 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:09:40,658 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 2 proven. 12 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-06-05 13:09:40,658 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [819078007] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:09:40,658 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:09:40,658 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 21 [2021-06-05 13:09:40,658 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [7016715] [2021-06-05 13:09:40,658 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-06-05 13:09:40,658 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:09:40,659 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-06-05 13:09:40,659 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=430, Unknown=0, NotChecked=0, Total=506 [2021-06-05 13:09:40,659 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) [2021-06-05 13:09:46,983 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:09:46,983 INFO L93 Difference]: Finished difference Result 146469 states and 500098 transitions. [2021-06-05 13:09:46,983 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 212 states. [2021-06-05 13:09:46,983 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 [2021-06-05 13:09:46,983 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:09:47,364 INFO L225 Difference]: With dead ends: 146469 [2021-06-05 13:09:47,364 INFO L226 Difference]: Without dead ends: 141792 [2021-06-05 13:09:47,366 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 238 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 228 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22202 ImplicationChecksByTransitivity, 3806.3ms TimeCoverageRelationStatistics Valid=7953, Invalid=44717, Unknown=0, NotChecked=0, Total=52670 [2021-06-05 13:09:48,061 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141792 states. [2021-06-05 13:09:49,063 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141792 to 15036. [2021-06-05 13:09:49,082 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) [2021-06-05 13:09:49,119 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15036 states to 15036 states and 56590 transitions. [2021-06-05 13:09:49,119 INFO L78 Accepts]: Start accepts. Automaton has 15036 states and 56590 transitions. Word has length 20 [2021-06-05 13:09:49,120 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:09:49,120 INFO L482 AbstractCegarLoop]: Abstraction has 15036 states and 56590 transitions. [2021-06-05 13:09:49,120 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) [2021-06-05 13:09:49,120 INFO L276 IsEmpty]: Start isEmpty. Operand 15036 states and 56590 transitions. [2021-06-05 13:09:49,126 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-06-05 13:09:49,126 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:09:49,126 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:09:49,326 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable70,65 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-05 13:09:49,327 INFO L430 AbstractCegarLoop]: === Iteration 26 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:09:49,327 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:09:49,327 INFO L82 PathProgramCache]: Analyzing trace with hash -1455844143, now seen corresponding path program 2 times [2021-06-05 13:09:49,327 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:09:49,327 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [880713036] [2021-06-05 13:09:49,327 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:09:49,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:09:49,382 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 10 proven. 3 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-06-05 13:09:49,383 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:09:49,383 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [880713036] [2021-06-05 13:09:49,383 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [880713036] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:09:49,383 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1416194821] [2021-06-05 13:09:49,383 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 [2021-06-05 13:09:49,403 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-06-05 13:09:49,403 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 13:09:49,403 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 12 conjunts are in the unsatisfiable core [2021-06-05 13:09:49,404 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:09:49,527 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 2 proven. 12 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-06-05 13:09:49,528 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1416194821] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:09:49,528 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:09:49,528 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 21 [2021-06-05 13:09:49,528 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [172016660] [2021-06-05 13:09:49,528 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-06-05 13:09:49,528 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:09:49,528 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-06-05 13:09:49,528 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=430, Unknown=0, NotChecked=0, Total=506 [2021-06-05 13:09:49,528 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) [2021-06-05 13:09:53,559 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:09:53,559 INFO L93 Difference]: Finished difference Result 89802 states and 307440 transitions. [2021-06-05 13:09:53,560 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 135 states. [2021-06-05 13:09:53,560 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 [2021-06-05 13:09:53,560 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:09:53,780 INFO L225 Difference]: With dead ends: 89802 [2021-06-05 13:09:53,780 INFO L226 Difference]: Without dead ends: 84231 [2021-06-05 13:09:53,781 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 151 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8686 ImplicationChecksByTransitivity, 2078.9ms TimeCoverageRelationStatistics Valid=3742, Invalid=19514, Unknown=0, NotChecked=0, Total=23256 [2021-06-05 13:09:54,090 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84231 states. [2021-06-05 13:09:54,741 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84231 to 14246. [2021-06-05 13:09:54,759 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) [2021-06-05 13:09:54,795 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14246 states to 14246 states and 53257 transitions. [2021-06-05 13:09:54,795 INFO L78 Accepts]: Start accepts. Automaton has 14246 states and 53257 transitions. Word has length 20 [2021-06-05 13:09:54,795 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:09:54,795 INFO L482 AbstractCegarLoop]: Abstraction has 14246 states and 53257 transitions. [2021-06-05 13:09:54,796 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) [2021-06-05 13:09:54,796 INFO L276 IsEmpty]: Start isEmpty. Operand 14246 states and 53257 transitions. [2021-06-05 13:09:54,801 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-06-05 13:09:54,802 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:09:54,802 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:09:55,003 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 66 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable71 [2021-06-05 13:09:55,003 INFO L430 AbstractCegarLoop]: === Iteration 27 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:09:55,003 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:09:55,003 INFO L82 PathProgramCache]: Analyzing trace with hash 110178282, now seen corresponding path program 3 times [2021-06-05 13:09:55,003 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:09:55,004 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [907815525] [2021-06-05 13:09:55,004 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:09:55,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:09:55,046 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-06-05 13:09:55,046 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:09:55,046 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [907815525] [2021-06-05 13:09:55,046 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [907815525] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:09:55,046 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2030162852] [2021-06-05 13:09:55,046 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 [2021-06-05 13:09:55,065 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-06-05 13:09:55,066 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 13:09:55,066 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 13 conjunts are in the unsatisfiable core [2021-06-05 13:09:55,066 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:09:55,194 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 4 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:09:55,194 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2030162852] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:09:55,194 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:09:55,194 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 12] total 20 [2021-06-05 13:09:55,194 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1163418565] [2021-06-05 13:09:55,194 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-06-05 13:09:55,194 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:09:55,195 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-06-05 13:09:55,195 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=382, Unknown=0, NotChecked=0, Total=462 [2021-06-05 13:09:55,195 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) [2021-06-05 13:10:01,249 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:10:01,249 INFO L93 Difference]: Finished difference Result 137309 states and 465635 transitions. [2021-06-05 13:10:01,249 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 220 states. [2021-06-05 13:10:01,250 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 [2021-06-05 13:10:01,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:10:01,613 INFO L225 Difference]: With dead ends: 137309 [2021-06-05 13:10:01,613 INFO L226 Difference]: Without dead ends: 132440 [2021-06-05 13:10:01,616 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 234 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23081 ImplicationChecksByTransitivity, 3284.6ms TimeCoverageRelationStatistics Valid=8220, Invalid=47240, Unknown=0, NotChecked=0, Total=55460 [2021-06-05 13:10:02,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132440 states. [2021-06-05 13:10:03,239 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132440 to 13987. [2021-06-05 13:10:03,257 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) [2021-06-05 13:10:03,294 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13987 states to 13987 states and 52177 transitions. [2021-06-05 13:10:03,294 INFO L78 Accepts]: Start accepts. Automaton has 13987 states and 52177 transitions. Word has length 20 [2021-06-05 13:10:03,294 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:10:03,294 INFO L482 AbstractCegarLoop]: Abstraction has 13987 states and 52177 transitions. [2021-06-05 13:10:03,294 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) [2021-06-05 13:10:03,294 INFO L276 IsEmpty]: Start isEmpty. Operand 13987 states and 52177 transitions. [2021-06-05 13:10:03,300 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-06-05 13:10:03,301 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:10:03,301 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:10:03,516 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable72,67 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-05 13:10:03,517 INFO L430 AbstractCegarLoop]: === Iteration 28 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:10:03,519 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:10:03,519 INFO L82 PathProgramCache]: Analyzing trace with hash -1448532884, now seen corresponding path program 1 times [2021-06-05 13:10:03,519 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:10:03,519 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1033233071] [2021-06-05 13:10:03,519 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:10:03,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:10:03,586 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-06-05 13:10:03,586 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:10:03,586 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1033233071] [2021-06-05 13:10:03,586 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1033233071] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:10:03,586 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2073306505] [2021-06-05 13:10:03,586 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 [2021-06-05 13:10:03,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:10:03,608 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 13 conjunts are in the unsatisfiable core [2021-06-05 13:10:03,608 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:10:03,745 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 2 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:10:03,745 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2073306505] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:10:03,745 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:10:03,745 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 12] total 19 [2021-06-05 13:10:03,752 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1883714577] [2021-06-05 13:10:03,753 INFO L462 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-06-05 13:10:03,753 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:10:03,753 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-06-05 13:10:03,753 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=350, Unknown=0, NotChecked=0, Total=420 [2021-06-05 13:10:03,753 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) [2021-06-05 13:10:07,644 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:10:07,645 INFO L93 Difference]: Finished difference Result 112269 states and 380480 transitions. [2021-06-05 13:10:07,645 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 137 states. [2021-06-05 13:10:07,645 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 [2021-06-05 13:10:07,645 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:10:07,933 INFO L225 Difference]: With dead ends: 112269 [2021-06-05 13:10:07,933 INFO L226 Difference]: Without dead ends: 108354 [2021-06-05 13:10:07,934 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 150 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8986 ImplicationChecksByTransitivity, 2042.8ms TimeCoverageRelationStatistics Valid=3541, Invalid=19411, Unknown=0, NotChecked=0, Total=22952 [2021-06-05 13:10:08,334 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108354 states. [2021-06-05 13:10:09,339 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108354 to 15105. [2021-06-05 13:10:09,358 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) [2021-06-05 13:10:09,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15105 states to 15105 states and 56767 transitions. [2021-06-05 13:10:09,396 INFO L78 Accepts]: Start accepts. Automaton has 15105 states and 56767 transitions. Word has length 20 [2021-06-05 13:10:09,397 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:10:09,397 INFO L482 AbstractCegarLoop]: Abstraction has 15105 states and 56767 transitions. [2021-06-05 13:10:09,397 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) [2021-06-05 13:10:09,397 INFO L276 IsEmpty]: Start isEmpty. Operand 15105 states and 56767 transitions. [2021-06-05 13:10:09,403 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-06-05 13:10:09,403 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:10:09,403 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:10:09,604 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable73,68 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-05 13:10:09,604 INFO L430 AbstractCegarLoop]: === Iteration 29 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:10:09,604 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:10:09,604 INFO L82 PathProgramCache]: Analyzing trace with hash 1555215370, now seen corresponding path program 2 times [2021-06-05 13:10:09,604 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:10:09,604 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [156183829] [2021-06-05 13:10:09,604 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:10:09,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:10:09,652 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 9 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-06-05 13:10:09,652 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:10:09,652 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [156183829] [2021-06-05 13:10:09,652 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [156183829] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:10:09,652 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [151361923] [2021-06-05 13:10:09,652 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 [2021-06-05 13:10:09,671 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-06-05 13:10:09,671 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 13:10:09,672 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 12 conjunts are in the unsatisfiable core [2021-06-05 13:10:09,672 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:10:09,811 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 2 proven. 12 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-06-05 13:10:09,811 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [151361923] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:10:09,811 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:10:09,811 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11] total 20 [2021-06-05 13:10:09,811 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [464560132] [2021-06-05 13:10:09,811 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-06-05 13:10:09,811 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:10:09,811 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-06-05 13:10:09,812 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=394, Unknown=0, NotChecked=0, Total=462 [2021-06-05 13:10:09,812 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) [2021-06-05 13:10:13,275 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:10:13,275 INFO L93 Difference]: Finished difference Result 87215 states and 298663 transitions. [2021-06-05 13:10:13,275 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 108 states. [2021-06-05 13:10:13,275 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 [2021-06-05 13:10:13,275 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:10:13,485 INFO L225 Difference]: With dead ends: 87215 [2021-06-05 13:10:13,485 INFO L226 Difference]: Without dead ends: 81323 [2021-06-05 13:10:13,486 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5547 ImplicationChecksByTransitivity, 1719.3ms TimeCoverageRelationStatistics Valid=2787, Invalid=12713, Unknown=0, NotChecked=0, Total=15500 [2021-06-05 13:10:13,791 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81323 states. [2021-06-05 13:10:14,476 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81323 to 14471. [2021-06-05 13:10:14,496 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) [2021-06-05 13:10:14,535 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14471 states to 14471 states and 54121 transitions. [2021-06-05 13:10:14,535 INFO L78 Accepts]: Start accepts. Automaton has 14471 states and 54121 transitions. Word has length 20 [2021-06-05 13:10:14,535 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:10:14,535 INFO L482 AbstractCegarLoop]: Abstraction has 14471 states and 54121 transitions. [2021-06-05 13:10:14,535 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) [2021-06-05 13:10:14,535 INFO L276 IsEmpty]: Start isEmpty. Operand 14471 states and 54121 transitions. [2021-06-05 13:10:14,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-06-05 13:10:14,542 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:10:14,542 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:10:14,757 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 69 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable74 [2021-06-05 13:10:14,757 INFO L430 AbstractCegarLoop]: === Iteration 30 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:10:14,757 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:10:14,757 INFO L82 PathProgramCache]: Analyzing trace with hash 1555220330, now seen corresponding path program 4 times [2021-06-05 13:10:14,757 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:10:14,757 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [74106644] [2021-06-05 13:10:14,757 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:10:14,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:10:14,818 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 9 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-06-05 13:10:14,819 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:10:14,819 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [74106644] [2021-06-05 13:10:14,819 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [74106644] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:10:14,819 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1526910711] [2021-06-05 13:10:14,819 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 [2021-06-05 13:10:14,838 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-06-05 13:10:14,838 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 13:10:14,838 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 13 conjunts are in the unsatisfiable core [2021-06-05 13:10:14,839 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:10:14,982 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 4 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:10:14,983 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1526910711] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:10:14,983 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:10:14,983 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 12] total 21 [2021-06-05 13:10:14,983 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [87879105] [2021-06-05 13:10:14,983 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-06-05 13:10:14,983 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:10:14,983 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-06-05 13:10:14,983 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=425, Unknown=0, NotChecked=0, Total=506 [2021-06-05 13:10:14,983 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) [2021-06-05 13:10:19,445 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:10:19,445 INFO L93 Difference]: Finished difference Result 103358 states and 351171 transitions. [2021-06-05 13:10:19,445 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 156 states. [2021-06-05 13:10:19,445 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 [2021-06-05 13:10:19,446 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:10:19,717 INFO L225 Difference]: With dead ends: 103358 [2021-06-05 13:10:19,717 INFO L226 Difference]: Without dead ends: 100586 [2021-06-05 13:10:19,718 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 172 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11841 ImplicationChecksByTransitivity, 2263.5ms TimeCoverageRelationStatistics Valid=4710, Invalid=25392, Unknown=0, NotChecked=0, Total=30102 [2021-06-05 13:10:20,075 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100586 states. [2021-06-05 13:10:20,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100586 to 14291. [2021-06-05 13:10:20,863 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) [2021-06-05 13:10:20,897 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14291 states to 14291 states and 53236 transitions. [2021-06-05 13:10:20,897 INFO L78 Accepts]: Start accepts. Automaton has 14291 states and 53236 transitions. Word has length 20 [2021-06-05 13:10:20,897 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:10:20,897 INFO L482 AbstractCegarLoop]: Abstraction has 14291 states and 53236 transitions. [2021-06-05 13:10:20,897 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) [2021-06-05 13:10:20,897 INFO L276 IsEmpty]: Start isEmpty. Operand 14291 states and 53236 transitions. [2021-06-05 13:10:20,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-06-05 13:10:20,904 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:10:20,904 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:10:21,104 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable75,70 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-05 13:10:21,104 INFO L430 AbstractCegarLoop]: === Iteration 31 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:10:21,104 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:10:21,104 INFO L82 PathProgramCache]: Analyzing trace with hash 928560718, now seen corresponding path program 3 times [2021-06-05 13:10:21,104 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:10:21,105 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1409882410] [2021-06-05 13:10:21,105 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:10:21,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:10:21,141 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 8 proven. 5 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-06-05 13:10:21,142 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:10:21,142 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1409882410] [2021-06-05 13:10:21,142 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1409882410] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:10:21,142 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1086976076] [2021-06-05 13:10:21,142 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 [2021-06-05 13:10:21,161 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-06-05 13:10:21,161 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 13:10:21,162 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 13 conjunts are in the unsatisfiable core [2021-06-05 13:10:21,162 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:10:21,298 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:10:21,299 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1086976076] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:10:21,299 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:10:21,299 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 12] total 20 [2021-06-05 13:10:21,299 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [20565933] [2021-06-05 13:10:21,299 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-06-05 13:10:21,299 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:10:21,299 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-06-05 13:10:21,299 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=384, Unknown=0, NotChecked=0, Total=462 [2021-06-05 13:10:21,299 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) [2021-06-05 13:10:22,232 WARN L205 SmtUtils]: Spent 179.00 ms on a formula simplification that was a NOOP. DAG size: 17 [2021-06-05 13:10:26,104 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:10:26,104 INFO L93 Difference]: Finished difference Result 109923 states and 373049 transitions. [2021-06-05 13:10:26,104 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 167 states. [2021-06-05 13:10:26,105 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 [2021-06-05 13:10:26,105 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:10:26,389 INFO L225 Difference]: With dead ends: 109923 [2021-06-05 13:10:26,389 INFO L226 Difference]: Without dead ends: 105297 [2021-06-05 13:10:26,391 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 181 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13031 ImplicationChecksByTransitivity, 2634.3ms TimeCoverageRelationStatistics Valid=5149, Invalid=28157, Unknown=0, NotChecked=0, Total=33306 [2021-06-05 13:10:26,923 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105297 states. [2021-06-05 13:10:27,572 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105297 to 14130. [2021-06-05 13:10:27,590 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) [2021-06-05 13:10:27,830 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14130 states to 14130 states and 52486 transitions. [2021-06-05 13:10:27,830 INFO L78 Accepts]: Start accepts. Automaton has 14130 states and 52486 transitions. Word has length 20 [2021-06-05 13:10:27,830 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:10:27,830 INFO L482 AbstractCegarLoop]: Abstraction has 14130 states and 52486 transitions. [2021-06-05 13:10:27,830 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) [2021-06-05 13:10:27,830 INFO L276 IsEmpty]: Start isEmpty. Operand 14130 states and 52486 transitions. [2021-06-05 13:10:27,837 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-06-05 13:10:27,837 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:10:27,837 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:10:28,037 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 71 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable76 [2021-06-05 13:10:28,038 INFO L430 AbstractCegarLoop]: === Iteration 32 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:10:28,038 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:10:28,038 INFO L82 PathProgramCache]: Analyzing trace with hash 661892531, now seen corresponding path program 3 times [2021-06-05 13:10:28,038 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:10:28,038 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1286226015] [2021-06-05 13:10:28,038 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:10:28,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:10:28,083 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 8 proven. 5 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-06-05 13:10:28,083 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:10:28,083 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1286226015] [2021-06-05 13:10:28,083 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1286226015] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:10:28,083 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1179424071] [2021-06-05 13:10:28,083 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 [2021-06-05 13:10:28,104 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-06-05 13:10:28,105 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 13:10:28,105 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 13 conjunts are in the unsatisfiable core [2021-06-05 13:10:28,105 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:10:28,269 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:10:28,269 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1179424071] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:10:28,269 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:10:28,269 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 12] total 20 [2021-06-05 13:10:28,269 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [198986965] [2021-06-05 13:10:28,269 INFO L462 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-06-05 13:10:28,269 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:10:28,269 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-06-05 13:10:28,269 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=384, Unknown=0, NotChecked=0, Total=462 [2021-06-05 13:10:28,271 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) [2021-06-05 13:10:32,976 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:10:32,976 INFO L93 Difference]: Finished difference Result 111174 states and 381892 transitions. [2021-06-05 13:10:32,976 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 163 states. [2021-06-05 13:10:32,976 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 [2021-06-05 13:10:32,976 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:10:33,270 INFO L225 Difference]: With dead ends: 111174 [2021-06-05 13:10:33,270 INFO L226 Difference]: Without dead ends: 108447 [2021-06-05 13:10:33,271 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 177 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12483 ImplicationChecksByTransitivity, 2355.1ms TimeCoverageRelationStatistics Valid=4843, Invalid=27019, Unknown=0, NotChecked=0, Total=31862 [2021-06-05 13:10:33,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108447 states. [2021-06-05 13:10:34,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108447 to 14184. [2021-06-05 13:10:34,480 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) [2021-06-05 13:10:34,518 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14184 states to 14184 states and 52823 transitions. [2021-06-05 13:10:34,519 INFO L78 Accepts]: Start accepts. Automaton has 14184 states and 52823 transitions. Word has length 20 [2021-06-05 13:10:34,519 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:10:34,519 INFO L482 AbstractCegarLoop]: Abstraction has 14184 states and 52823 transitions. [2021-06-05 13:10:34,519 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) [2021-06-05 13:10:34,519 INFO L276 IsEmpty]: Start isEmpty. Operand 14184 states and 52823 transitions. [2021-06-05 13:10:34,526 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-06-05 13:10:34,526 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:10:34,526 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:10:34,742 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 72 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable77 [2021-06-05 13:10:34,742 INFO L430 AbstractCegarLoop]: === Iteration 33 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:10:34,742 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:10:34,742 INFO L82 PathProgramCache]: Analyzing trace with hash -895984788, now seen corresponding path program 4 times [2021-06-05 13:10:34,742 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:10:34,742 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [603916142] [2021-06-05 13:10:34,742 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:10:34,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:10:34,789 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 10 proven. 3 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-06-05 13:10:34,789 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:10:34,789 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [603916142] [2021-06-05 13:10:34,789 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [603916142] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:10:34,789 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [54740947] [2021-06-05 13:10:34,789 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 [2021-06-05 13:10:34,810 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-06-05 13:10:34,810 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 13:10:34,810 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 13 conjunts are in the unsatisfiable core [2021-06-05 13:10:34,811 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:10:34,959 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:10:34,959 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [54740947] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:10:34,959 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:10:34,959 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 12] total 21 [2021-06-05 13:10:34,959 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [442479626] [2021-06-05 13:10:34,959 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-06-05 13:10:34,959 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:10:34,960 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-06-05 13:10:34,960 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=423, Unknown=0, NotChecked=0, Total=506 [2021-06-05 13:10:34,960 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) [2021-06-05 13:10:39,151 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:10:39,152 INFO L93 Difference]: Finished difference Result 90037 states and 306719 transitions. [2021-06-05 13:10:39,152 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 123 states. [2021-06-05 13:10:39,152 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 [2021-06-05 13:10:39,152 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:10:39,366 INFO L225 Difference]: With dead ends: 90037 [2021-06-05 13:10:39,366 INFO L226 Difference]: Without dead ends: 86625 [2021-06-05 13:10:39,367 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 139 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7237 ImplicationChecksByTransitivity, 2136.8ms TimeCoverageRelationStatistics Valid=3366, Invalid=16374, Unknown=0, NotChecked=0, Total=19740 [2021-06-05 13:10:39,682 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86625 states. [2021-06-05 13:10:40,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86625 to 13849. [2021-06-05 13:10:40,378 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) [2021-06-05 13:10:40,411 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13849 states to 13849 states and 51100 transitions. [2021-06-05 13:10:40,412 INFO L78 Accepts]: Start accepts. Automaton has 13849 states and 51100 transitions. Word has length 20 [2021-06-05 13:10:40,412 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:10:40,412 INFO L482 AbstractCegarLoop]: Abstraction has 13849 states and 51100 transitions. [2021-06-05 13:10:40,412 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) [2021-06-05 13:10:40,412 INFO L276 IsEmpty]: Start isEmpty. Operand 13849 states and 51100 transitions. [2021-06-05 13:10:40,418 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-06-05 13:10:40,418 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:10:40,418 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:10:40,619 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 73 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable78 [2021-06-05 13:10:40,619 INFO L430 AbstractCegarLoop]: === Iteration 34 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:10:40,619 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:10:40,619 INFO L82 PathProgramCache]: Analyzing trace with hash -895989743, now seen corresponding path program 4 times [2021-06-05 13:10:40,619 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:10:40,619 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1165679521] [2021-06-05 13:10:40,619 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:10:40,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:10:40,688 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 10 proven. 3 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-06-05 13:10:40,688 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:10:40,688 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1165679521] [2021-06-05 13:10:40,688 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1165679521] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:10:40,688 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1766332168] [2021-06-05 13:10:40,689 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 [2021-06-05 13:10:40,710 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-06-05 13:10:40,710 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 13:10:40,710 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 13 conjunts are in the unsatisfiable core [2021-06-05 13:10:40,710 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:10:40,843 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:10:40,844 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1766332168] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:10:40,844 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:10:40,844 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 12] total 21 [2021-06-05 13:10:40,844 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1142659826] [2021-06-05 13:10:40,844 INFO L462 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-06-05 13:10:40,844 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:10:40,844 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-06-05 13:10:40,844 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=423, Unknown=0, NotChecked=0, Total=506 [2021-06-05 13:10:40,844 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) [2021-06-05 13:10:42,588 WARN L205 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 14 [2021-06-05 13:10:44,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:10:44,310 INFO L93 Difference]: Finished difference Result 83985 states and 285638 transitions. [2021-06-05 13:10:44,311 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 114 states. [2021-06-05 13:10:44,311 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 [2021-06-05 13:10:44,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:10:44,521 INFO L225 Difference]: With dead ends: 83985 [2021-06-05 13:10:44,521 INFO L226 Difference]: Without dead ends: 80537 [2021-06-05 13:10:44,523 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 130 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6202 ImplicationChecksByTransitivity, 1589.2ms TimeCoverageRelationStatistics Valid=2941, Invalid=14351, Unknown=0, NotChecked=0, Total=17292 [2021-06-05 13:10:45,027 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80537 states. [2021-06-05 13:10:45,487 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80537 to 13213. [2021-06-05 13:10:45,502 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) [2021-06-05 13:10:45,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13213 states to 13213 states and 48275 transitions. [2021-06-05 13:10:45,533 INFO L78 Accepts]: Start accepts. Automaton has 13213 states and 48275 transitions. Word has length 20 [2021-06-05 13:10:45,535 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:10:45,535 INFO L482 AbstractCegarLoop]: Abstraction has 13213 states and 48275 transitions. [2021-06-05 13:10:45,535 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) [2021-06-05 13:10:45,535 INFO L276 IsEmpty]: Start isEmpty. Operand 13213 states and 48275 transitions. [2021-06-05 13:10:45,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-06-05 13:10:45,541 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:10:45,541 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:10:45,741 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable79,74 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-05 13:10:45,741 INFO L430 AbstractCegarLoop]: === Iteration 35 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:10:45,742 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:10:45,742 INFO L82 PathProgramCache]: Analyzing trace with hash -502412406, now seen corresponding path program 5 times [2021-06-05 13:10:45,742 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:10:45,742 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1283832209] [2021-06-05 13:10:45,742 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:10:45,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:10:45,800 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 12 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:10:45,800 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:10:45,800 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1283832209] [2021-06-05 13:10:45,800 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1283832209] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:10:45,800 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1388558058] [2021-06-05 13:10:45,800 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 [2021-06-05 13:10:45,822 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-06-05 13:10:45,822 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 13:10:45,822 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 13 conjunts are in the unsatisfiable core [2021-06-05 13:10:45,822 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:10:45,974 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 12 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:10:45,974 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1388558058] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:10:45,974 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:10:45,974 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 23 [2021-06-05 13:10:45,974 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1491269629] [2021-06-05 13:10:45,974 INFO L462 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-06-05 13:10:45,974 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:10:45,975 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-06-05 13:10:45,975 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=502, Unknown=0, NotChecked=0, Total=600 [2021-06-05 13:10:45,975 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) [2021-06-05 13:10:50,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:10:50,309 INFO L93 Difference]: Finished difference Result 89637 states and 302269 transitions. [2021-06-05 13:10:50,310 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 151 states. [2021-06-05 13:10:50,310 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 [2021-06-05 13:10:50,310 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:10:50,526 INFO L225 Difference]: With dead ends: 89637 [2021-06-05 13:10:50,526 INFO L226 Difference]: Without dead ends: 86823 [2021-06-05 13:10:50,528 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 170 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11122 ImplicationChecksByTransitivity, 2074.3ms TimeCoverageRelationStatistics Valid=4815, Invalid=24597, Unknown=0, NotChecked=0, Total=29412 [2021-06-05 13:10:50,953 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86823 states. [2021-06-05 13:10:51,414 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86823 to 12694. [2021-06-05 13:10:51,429 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) [2021-06-05 13:10:51,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12694 states to 12694 states and 46051 transitions. [2021-06-05 13:10:51,459 INFO L78 Accepts]: Start accepts. Automaton has 12694 states and 46051 transitions. Word has length 20 [2021-06-05 13:10:51,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:10:51,459 INFO L482 AbstractCegarLoop]: Abstraction has 12694 states and 46051 transitions. [2021-06-05 13:10:51,459 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) [2021-06-05 13:10:51,459 INFO L276 IsEmpty]: Start isEmpty. Operand 12694 states and 46051 transitions. [2021-06-05 13:10:51,465 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-06-05 13:10:51,465 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:10:51,465 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:10:51,665 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable80,75 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-05 13:10:51,665 INFO L430 AbstractCegarLoop]: === Iteration 36 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:10:51,666 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:10:51,666 INFO L82 PathProgramCache]: Analyzing trace with hash -502407446, now seen corresponding path program 5 times [2021-06-05 13:10:51,666 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:10:51,666 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1653469157] [2021-06-05 13:10:51,666 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:10:51,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:10:51,723 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 12 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:10:51,723 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:10:51,723 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1653469157] [2021-06-05 13:10:51,723 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1653469157] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:10:51,723 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1118180573] [2021-06-05 13:10:51,723 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 [2021-06-05 13:10:51,744 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-06-05 13:10:51,744 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 13:10:51,744 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 13 conjunts are in the unsatisfiable core [2021-06-05 13:10:51,745 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:10:51,890 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 12 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:10:51,890 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1118180573] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:10:51,890 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:10:51,890 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 23 [2021-06-05 13:10:51,890 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [382758686] [2021-06-05 13:10:51,890 INFO L462 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-06-05 13:10:51,890 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:10:51,891 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-06-05 13:10:51,891 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=502, Unknown=0, NotChecked=0, Total=600 [2021-06-05 13:10:51,891 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) [2021-06-05 13:10:52,348 WARN L205 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 10 [2021-06-05 13:10:56,071 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:10:56,071 INFO L93 Difference]: Finished difference Result 88510 states and 301236 transitions. [2021-06-05 13:10:56,071 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 148 states. [2021-06-05 13:10:56,071 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 [2021-06-05 13:10:56,071 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:10:56,285 INFO L225 Difference]: With dead ends: 88510 [2021-06-05 13:10:56,286 INFO L226 Difference]: Without dead ends: 87235 [2021-06-05 13:10:56,287 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 167 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10674 ImplicationChecksByTransitivity, 1976.2ms TimeCoverageRelationStatistics Valid=4639, Invalid=23753, Unknown=0, NotChecked=0, Total=28392 [2021-06-05 13:10:56,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87235 states. [2021-06-05 13:10:57,161 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87235 to 12124. [2021-06-05 13:10:57,176 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) [2021-06-05 13:10:57,204 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12124 states to 12124 states and 43565 transitions. [2021-06-05 13:10:57,205 INFO L78 Accepts]: Start accepts. Automaton has 12124 states and 43565 transitions. Word has length 20 [2021-06-05 13:10:57,205 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:10:57,205 INFO L482 AbstractCegarLoop]: Abstraction has 12124 states and 43565 transitions. [2021-06-05 13:10:57,205 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) [2021-06-05 13:10:57,205 INFO L276 IsEmpty]: Start isEmpty. Operand 12124 states and 43565 transitions. [2021-06-05 13:10:57,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-06-05 13:10:57,210 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:10:57,210 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:10:57,411 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable81,76 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-05 13:10:57,411 INFO L430 AbstractCegarLoop]: === Iteration 37 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:10:57,411 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:10:57,411 INFO L82 PathProgramCache]: Analyzing trace with hash -511935606, now seen corresponding path program 6 times [2021-06-05 13:10:57,411 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:10:57,411 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1345478342] [2021-06-05 13:10:57,412 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:10:57,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:10:57,489 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 12 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:10:57,489 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:10:57,489 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1345478342] [2021-06-05 13:10:57,489 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1345478342] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:10:57,489 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [393953184] [2021-06-05 13:10:57,489 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 [2021-06-05 13:10:57,512 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-06-05 13:10:57,512 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 13:10:57,512 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 13 conjunts are in the unsatisfiable core [2021-06-05 13:10:57,512 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:10:57,650 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 12 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:10:57,651 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [393953184] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:10:57,651 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:10:57,651 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 23 [2021-06-05 13:10:57,651 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1221663142] [2021-06-05 13:10:57,651 INFO L462 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-06-05 13:10:57,651 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:10:57,651 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-06-05 13:10:57,651 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=502, Unknown=0, NotChecked=0, Total=600 [2021-06-05 13:10:57,651 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) [2021-06-05 13:11:01,207 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:11:01,207 INFO L93 Difference]: Finished difference Result 74393 states and 251130 transitions. [2021-06-05 13:11:01,208 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 138 states. [2021-06-05 13:11:01,208 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 [2021-06-05 13:11:01,208 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:11:01,385 INFO L225 Difference]: With dead ends: 74393 [2021-06-05 13:11:01,385 INFO L226 Difference]: Without dead ends: 73034 [2021-06-05 13:11:01,386 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 157 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9237 ImplicationChecksByTransitivity, 1814.1ms TimeCoverageRelationStatistics Valid=4142, Invalid=20980, Unknown=0, NotChecked=0, Total=25122 [2021-06-05 13:11:01,641 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73034 states. [2021-06-05 13:11:02,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73034 to 10664. [2021-06-05 13:11:02,081 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) [2021-06-05 13:11:02,103 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10664 states to 10664 states and 38053 transitions. [2021-06-05 13:11:02,103 INFO L78 Accepts]: Start accepts. Automaton has 10664 states and 38053 transitions. Word has length 20 [2021-06-05 13:11:02,103 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:11:02,103 INFO L482 AbstractCegarLoop]: Abstraction has 10664 states and 38053 transitions. [2021-06-05 13:11:02,103 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) [2021-06-05 13:11:02,103 INFO L276 IsEmpty]: Start isEmpty. Operand 10664 states and 38053 transitions. [2021-06-05 13:11:02,108 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-06-05 13:11:02,108 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:11:02,108 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:11:02,309 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable82,77 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-05 13:11:02,309 INFO L430 AbstractCegarLoop]: === Iteration 38 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:11:02,312 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:11:02,312 INFO L82 PathProgramCache]: Analyzing trace with hash -511940561, now seen corresponding path program 5 times [2021-06-05 13:11:02,312 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:11:02,313 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1630422926] [2021-06-05 13:11:02,313 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:11:02,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:11:02,448 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 12 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:11:02,449 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:11:02,449 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1630422926] [2021-06-05 13:11:02,449 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1630422926] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:11:02,449 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1330310643] [2021-06-05 13:11:02,449 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 [2021-06-05 13:11:02,470 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-06-05 13:11:02,470 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 13:11:02,471 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 13 conjunts are in the unsatisfiable core [2021-06-05 13:11:02,471 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:11:02,606 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 12 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:11:02,606 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1330310643] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:11:02,606 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:11:02,606 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 23 [2021-06-05 13:11:02,606 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1022396109] [2021-06-05 13:11:02,606 INFO L462 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-06-05 13:11:02,606 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:11:02,606 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-06-05 13:11:02,606 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=502, Unknown=0, NotChecked=0, Total=600 [2021-06-05 13:11:02,607 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) [2021-06-05 13:11:06,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:11:06,336 INFO L93 Difference]: Finished difference Result 69682 states and 238068 transitions. [2021-06-05 13:11:06,337 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 137 states. [2021-06-05 13:11:06,337 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 [2021-06-05 13:11:06,337 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:11:06,504 INFO L225 Difference]: With dead ends: 69682 [2021-06-05 13:11:06,504 INFO L226 Difference]: Without dead ends: 68422 [2021-06-05 13:11:06,505 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 156 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9158 ImplicationChecksByTransitivity, 1749.0ms TimeCoverageRelationStatistics Valid=4090, Invalid=20716, Unknown=0, NotChecked=0, Total=24806 [2021-06-05 13:11:06,737 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68422 states. [2021-06-05 13:11:07,173 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68422 to 10193. [2021-06-05 13:11:07,186 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) [2021-06-05 13:11:07,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10193 states to 10193 states and 35972 transitions. [2021-06-05 13:11:07,210 INFO L78 Accepts]: Start accepts. Automaton has 10193 states and 35972 transitions. Word has length 20 [2021-06-05 13:11:07,211 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:11:07,211 INFO L482 AbstractCegarLoop]: Abstraction has 10193 states and 35972 transitions. [2021-06-05 13:11:07,211 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) [2021-06-05 13:11:07,211 INFO L276 IsEmpty]: Start isEmpty. Operand 10193 states and 35972 transitions. [2021-06-05 13:11:07,216 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-06-05 13:11:07,216 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:11:07,216 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:11:07,433 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 78 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable83 [2021-06-05 13:11:07,433 INFO L430 AbstractCegarLoop]: === Iteration 39 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:11:07,433 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:11:07,433 INFO L82 PathProgramCache]: Analyzing trace with hash -507169046, now seen corresponding path program 6 times [2021-06-05 13:11:07,433 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:11:07,433 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1918794770] [2021-06-05 13:11:07,433 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:11:07,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:11:07,575 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 12 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:11:07,575 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:11:07,575 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1918794770] [2021-06-05 13:11:07,575 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1918794770] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:11:07,575 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2051371530] [2021-06-05 13:11:07,575 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 [2021-06-05 13:11:07,596 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-06-05 13:11:07,596 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 13:11:07,596 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 13 conjunts are in the unsatisfiable core [2021-06-05 13:11:07,597 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:11:07,739 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 12 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:11:07,739 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2051371530] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:11:07,739 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:11:07,739 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 23 [2021-06-05 13:11:07,739 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [71549134] [2021-06-05 13:11:07,739 INFO L462 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-06-05 13:11:07,739 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:11:07,739 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-06-05 13:11:07,739 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=502, Unknown=0, NotChecked=0, Total=600 [2021-06-05 13:11:07,740 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) [2021-06-05 13:11:11,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:11:11,394 INFO L93 Difference]: Finished difference Result 73158 states and 249229 transitions. [2021-06-05 13:11:11,395 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 146 states. [2021-06-05 13:11:11,395 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 [2021-06-05 13:11:11,395 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:11:11,574 INFO L225 Difference]: With dead ends: 73158 [2021-06-05 13:11:11,574 INFO L226 Difference]: Without dead ends: 71790 [2021-06-05 13:11:11,575 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 165 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10445 ImplicationChecksByTransitivity, 1870.9ms TimeCoverageRelationStatistics Valid=4563, Invalid=23159, Unknown=0, NotChecked=0, Total=27722 [2021-06-05 13:11:11,814 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71790 states. [2021-06-05 13:11:12,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71790 to 8929. [2021-06-05 13:11:12,238 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) [2021-06-05 13:11:12,257 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8929 states to 8929 states and 31350 transitions. [2021-06-05 13:11:12,257 INFO L78 Accepts]: Start accepts. Automaton has 8929 states and 31350 transitions. Word has length 20 [2021-06-05 13:11:12,257 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:11:12,257 INFO L482 AbstractCegarLoop]: Abstraction has 8929 states and 31350 transitions. [2021-06-05 13:11:12,257 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) [2021-06-05 13:11:12,257 INFO L276 IsEmpty]: Start isEmpty. Operand 8929 states and 31350 transitions. [2021-06-05 13:11:12,262 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-06-05 13:11:12,262 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:11:12,262 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:11:12,462 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable84,79 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-05 13:11:12,463 INFO L430 AbstractCegarLoop]: === Iteration 40 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:11:12,463 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:11:12,463 INFO L82 PathProgramCache]: Analyzing trace with hash -507178961, now seen corresponding path program 6 times [2021-06-05 13:11:12,463 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:11:12,463 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1538184128] [2021-06-05 13:11:12,463 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:11:12,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:11:12,523 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 12 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:11:12,523 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:11:12,523 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1538184128] [2021-06-05 13:11:12,523 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1538184128] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:11:12,524 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1383041745] [2021-06-05 13:11:12,524 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 [2021-06-05 13:11:12,557 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-06-05 13:11:12,557 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 13:11:12,558 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 13 conjunts are in the unsatisfiable core [2021-06-05 13:11:12,558 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:11:12,696 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 12 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:11:12,696 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1383041745] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:11:12,696 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:11:12,696 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 23 [2021-06-05 13:11:12,696 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2079408601] [2021-06-05 13:11:12,696 INFO L462 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-06-05 13:11:12,696 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:11:12,696 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-06-05 13:11:12,697 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=502, Unknown=0, NotChecked=0, Total=600 [2021-06-05 13:11:12,697 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) [2021-06-05 13:11:15,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:11:15,512 INFO L93 Difference]: Finished difference Result 61552 states and 209638 transitions. [2021-06-05 13:11:15,512 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 112 states. [2021-06-05 13:11:15,513 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 [2021-06-05 13:11:15,513 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:11:15,658 INFO L225 Difference]: With dead ends: 61552 [2021-06-05 13:11:15,659 INFO L226 Difference]: Without dead ends: 58801 [2021-06-05 13:11:15,660 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6233 ImplicationChecksByTransitivity, 1307.2ms TimeCoverageRelationStatistics Valid=2800, Invalid=14756, Unknown=0, NotChecked=0, Total=17556 [2021-06-05 13:11:15,856 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58801 states. [2021-06-05 13:11:16,200 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58801 to 7611. [2021-06-05 13:11:16,208 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) [2021-06-05 13:11:16,224 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7611 states to 7611 states and 26438 transitions. [2021-06-05 13:11:16,225 INFO L78 Accepts]: Start accepts. Automaton has 7611 states and 26438 transitions. Word has length 20 [2021-06-05 13:11:16,225 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:11:16,225 INFO L482 AbstractCegarLoop]: Abstraction has 7611 states and 26438 transitions. [2021-06-05 13:11:16,225 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) [2021-06-05 13:11:16,225 INFO L276 IsEmpty]: Start isEmpty. Operand 7611 states and 26438 transitions. [2021-06-05 13:11:16,230 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-06-05 13:11:16,230 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:11:16,231 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:11:16,431 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable85,80 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-05 13:11:16,431 INFO L430 AbstractCegarLoop]: === Iteration 41 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:11:16,431 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:11:16,431 INFO L82 PathProgramCache]: Analyzing trace with hash 156516717, now seen corresponding path program 1 times [2021-06-05 13:11:16,431 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:11:16,431 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [619381309] [2021-06-05 13:11:16,432 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:11:16,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:11:16,482 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-06-05 13:11:16,482 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:11:16,482 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [619381309] [2021-06-05 13:11:16,482 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [619381309] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:11:16,482 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1654808163] [2021-06-05 13:11:16,482 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2021-06-05 13:11:16,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:11:16,503 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 15 conjunts are in the unsatisfiable core [2021-06-05 13:11:16,504 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:11:16,652 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:11:16,652 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1654808163] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:11:16,652 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:11:16,652 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 14] total 22 [2021-06-05 13:11:16,652 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [155405625] [2021-06-05 13:11:16,653 INFO L462 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-06-05 13:11:16,653 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:11:16,653 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-06-05 13:11:16,653 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=470, Unknown=0, NotChecked=0, Total=552 [2021-06-05 13:11:16,653 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) [2021-06-05 13:11:28,649 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:11:28,649 INFO L93 Difference]: Finished difference Result 130893 states and 412051 transitions. [2021-06-05 13:11:28,649 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 435 states. [2021-06-05 13:11:28,649 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 [2021-06-05 13:11:28,649 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:11:28,974 INFO L225 Difference]: With dead ends: 130893 [2021-06-05 13:11:28,974 INFO L226 Difference]: Without dead ends: 125848 [2021-06-05 13:11:28,993 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 464 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 451 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 94844 ImplicationChecksByTransitivity, 8290.3ms TimeCoverageRelationStatistics Valid=20977, Invalid=183779, Unknown=0, NotChecked=0, Total=204756 [2021-06-05 13:11:29,510 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125848 states. [2021-06-05 13:11:30,261 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125848 to 7633. [2021-06-05 13:11:30,270 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) [2021-06-05 13:11:30,287 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7633 states to 7633 states and 26619 transitions. [2021-06-05 13:11:30,287 INFO L78 Accepts]: Start accepts. Automaton has 7633 states and 26619 transitions. Word has length 22 [2021-06-05 13:11:30,287 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:11:30,287 INFO L482 AbstractCegarLoop]: Abstraction has 7633 states and 26619 transitions. [2021-06-05 13:11:30,287 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) [2021-06-05 13:11:30,287 INFO L276 IsEmpty]: Start isEmpty. Operand 7633 states and 26619 transitions. [2021-06-05 13:11:30,293 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-06-05 13:11:30,293 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:11:30,293 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:11:30,493 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable86,81 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-05 13:11:30,493 INFO L430 AbstractCegarLoop]: === Iteration 42 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:11:30,493 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:11:30,493 INFO L82 PathProgramCache]: Analyzing trace with hash -1134702325, now seen corresponding path program 2 times [2021-06-05 13:11:30,494 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:11:30,494 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1875783306] [2021-06-05 13:11:30,494 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:11:30,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:11:30,560 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-06-05 13:11:30,560 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:11:30,560 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1875783306] [2021-06-05 13:11:30,560 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1875783306] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:11:30,560 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [564006042] [2021-06-05 13:11:30,560 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 [2021-06-05 13:11:30,583 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-06-05 13:11:30,583 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 13:11:30,583 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 15 conjunts are in the unsatisfiable core [2021-06-05 13:11:30,583 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:11:30,746 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 2 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:11:30,747 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [564006042] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:11:30,747 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:11:30,747 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 14] total 24 [2021-06-05 13:11:30,747 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [36906684] [2021-06-05 13:11:30,747 INFO L462 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-06-05 13:11:30,747 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:11:30,747 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-06-05 13:11:30,747 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=557, Unknown=0, NotChecked=0, Total=650 [2021-06-05 13:11:30,747 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) [2021-06-05 13:11:42,204 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:11:42,205 INFO L93 Difference]: Finished difference Result 120839 states and 386460 transitions. [2021-06-05 13:11:42,207 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 411 states. [2021-06-05 13:11:42,208 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 [2021-06-05 13:11:42,208 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:11:42,509 INFO L225 Difference]: With dead ends: 120839 [2021-06-05 13:11:42,509 INFO L226 Difference]: Without dead ends: 117432 [2021-06-05 13:11:42,526 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 440 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 429 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 84585 ImplicationChecksByTransitivity, 7545.1ms TimeCoverageRelationStatistics Valid=17986, Invalid=167344, Unknown=0, NotChecked=0, Total=185330 [2021-06-05 13:11:43,406 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117432 states. [2021-06-05 13:11:43,923 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117432 to 6828. [2021-06-05 13:11:43,930 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) [2021-06-05 13:11:43,944 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6828 states to 6828 states and 23903 transitions. [2021-06-05 13:11:43,945 INFO L78 Accepts]: Start accepts. Automaton has 6828 states and 23903 transitions. Word has length 22 [2021-06-05 13:11:43,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:11:43,945 INFO L482 AbstractCegarLoop]: Abstraction has 6828 states and 23903 transitions. [2021-06-05 13:11:43,945 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) [2021-06-05 13:11:43,945 INFO L276 IsEmpty]: Start isEmpty. Operand 6828 states and 23903 transitions. [2021-06-05 13:11:43,949 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-06-05 13:11:43,949 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:11:43,949 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:11:44,149 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable87,82 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-05 13:11:44,150 INFO L430 AbstractCegarLoop]: === Iteration 43 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:11:44,152 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:11:44,152 INFO L82 PathProgramCache]: Analyzing trace with hash -1761356977, now seen corresponding path program 3 times [2021-06-05 13:11:44,152 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:11:44,152 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1636720839] [2021-06-05 13:11:44,153 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:11:44,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:11:44,200 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 5 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-06-05 13:11:44,200 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:11:44,200 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1636720839] [2021-06-05 13:11:44,200 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1636720839] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:11:44,200 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1071936309] [2021-06-05 13:11:44,200 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 [2021-06-05 13:11:44,222 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-06-05 13:11:44,222 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 13:11:44,222 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 15 conjunts are in the unsatisfiable core [2021-06-05 13:11:44,223 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:11:44,374 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:11:44,374 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1071936309] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:11:44,374 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:11:44,374 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 14] total 23 [2021-06-05 13:11:44,374 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2114682530] [2021-06-05 13:11:44,374 INFO L462 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-06-05 13:11:44,374 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:11:44,375 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-06-05 13:11:44,375 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=510, Unknown=0, NotChecked=0, Total=600 [2021-06-05 13:11:44,375 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) [2021-06-05 13:11:56,484 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:11:56,484 INFO L93 Difference]: Finished difference Result 141310 states and 453746 transitions. [2021-06-05 13:11:56,484 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 412 states. [2021-06-05 13:11:56,484 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 [2021-06-05 13:11:56,484 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:11:56,825 INFO L225 Difference]: With dead ends: 141310 [2021-06-05 13:11:56,825 INFO L226 Difference]: Without dead ends: 139177 [2021-06-05 13:11:56,832 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 442 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 430 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 82680 ImplicationChecksByTransitivity, 7588.7ms TimeCoverageRelationStatistics Valid=18222, Invalid=167970, Unknown=0, NotChecked=0, Total=186192 [2021-06-05 13:11:57,519 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139177 states. [2021-06-05 13:11:58,117 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139177 to 6729. [2021-06-05 13:11:58,124 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) [2021-06-05 13:11:58,138 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6729 states to 6729 states and 23531 transitions. [2021-06-05 13:11:58,138 INFO L78 Accepts]: Start accepts. Automaton has 6729 states and 23531 transitions. Word has length 22 [2021-06-05 13:11:58,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:11:58,138 INFO L482 AbstractCegarLoop]: Abstraction has 6729 states and 23531 transitions. [2021-06-05 13:11:58,138 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) [2021-06-05 13:11:58,138 INFO L276 IsEmpty]: Start isEmpty. Operand 6729 states and 23531 transitions. [2021-06-05 13:11:58,142 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-06-05 13:11:58,142 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:11:58,142 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:11:58,343 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 83 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable88 [2021-06-05 13:11:58,343 INFO L430 AbstractCegarLoop]: === Iteration 44 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:11:58,343 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:11:58,343 INFO L82 PathProgramCache]: Analyzing trace with hash 709064813, now seen corresponding path program 4 times [2021-06-05 13:11:58,343 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:11:58,343 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [669525241] [2021-06-05 13:11:58,343 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:11:58,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:11:58,397 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 8 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-06-05 13:11:58,397 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:11:58,397 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [669525241] [2021-06-05 13:11:58,397 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [669525241] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:11:58,398 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1662285387] [2021-06-05 13:11:58,398 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 [2021-06-05 13:11:58,422 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-06-05 13:11:58,422 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 13:11:58,422 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 15 conjunts are in the unsatisfiable core [2021-06-05 13:11:58,423 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:11:58,610 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:11:58,610 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1662285387] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:11:58,610 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:11:58,610 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 14] total 24 [2021-06-05 13:11:58,610 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [559053441] [2021-06-05 13:11:58,610 INFO L462 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-06-05 13:11:58,610 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:11:58,610 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-06-05 13:11:58,610 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=555, Unknown=0, NotChecked=0, Total=650 [2021-06-05 13:11:58,611 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) [2021-06-05 13:11:59,001 WARN L205 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 10 [2021-06-05 13:12:06,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:12:06,787 INFO L93 Difference]: Finished difference Result 95125 states and 305471 transitions. [2021-06-05 13:12:06,789 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 296 states. [2021-06-05 13:12:06,789 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 [2021-06-05 13:12:06,789 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:12:07,203 INFO L225 Difference]: With dead ends: 95125 [2021-06-05 13:12:07,204 INFO L226 Difference]: Without dead ends: 93187 [2021-06-05 13:12:07,206 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 326 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 315 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43498 ImplicationChecksByTransitivity, 4762.1ms TimeCoverageRelationStatistics Valid=10519, Invalid=89653, Unknown=0, NotChecked=0, Total=100172 [2021-06-05 13:12:07,530 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93187 states. [2021-06-05 13:12:08,156 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93187 to 6580. [2021-06-05 13:12:08,163 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) [2021-06-05 13:12:08,177 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6580 states to 6580 states and 23092 transitions. [2021-06-05 13:12:08,177 INFO L78 Accepts]: Start accepts. Automaton has 6580 states and 23092 transitions. Word has length 22 [2021-06-05 13:12:08,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:12:08,177 INFO L482 AbstractCegarLoop]: Abstraction has 6580 states and 23092 transitions. [2021-06-05 13:12:08,178 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) [2021-06-05 13:12:08,178 INFO L276 IsEmpty]: Start isEmpty. Operand 6580 states and 23092 transitions. [2021-06-05 13:12:08,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-06-05 13:12:08,181 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:12:08,181 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:12:08,382 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 84 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable89 [2021-06-05 13:12:08,382 INFO L430 AbstractCegarLoop]: === Iteration 45 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:12:08,382 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:12:08,382 INFO L82 PathProgramCache]: Analyzing trace with hash 1102637195, now seen corresponding path program 5 times [2021-06-05 13:12:08,382 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:12:08,382 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [312114105] [2021-06-05 13:12:08,382 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:12:08,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:12:08,450 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 10 proven. 3 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-06-05 13:12:08,450 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:12:08,450 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [312114105] [2021-06-05 13:12:08,450 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [312114105] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:12:08,450 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1613194175] [2021-06-05 13:12:08,451 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 [2021-06-05 13:12:08,473 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-06-05 13:12:08,473 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 13:12:08,473 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 15 conjunts are in the unsatisfiable core [2021-06-05 13:12:08,474 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:12:08,628 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:12:08,628 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1613194175] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:12:08,628 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:12:08,628 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14] total 26 [2021-06-05 13:12:08,629 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1698223483] [2021-06-05 13:12:08,629 INFO L462 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-06-05 13:12:08,629 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:12:08,629 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-06-05 13:12:08,629 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=646, Unknown=0, NotChecked=0, Total=756 [2021-06-05 13:12:08,629 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) [2021-06-05 13:12:16,203 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:12:16,203 INFO L93 Difference]: Finished difference Result 96863 states and 310624 transitions. [2021-06-05 13:12:16,203 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 292 states. [2021-06-05 13:12:16,204 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 [2021-06-05 13:12:16,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:12:16,423 INFO L225 Difference]: With dead ends: 96863 [2021-06-05 13:12:16,423 INFO L226 Difference]: Without dead ends: 95855 [2021-06-05 13:12:16,426 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 323 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 314 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43291 ImplicationChecksByTransitivity, 4406.3ms TimeCoverageRelationStatistics Valid=10337, Invalid=89203, Unknown=0, NotChecked=0, Total=99540 [2021-06-05 13:12:16,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95855 states. [2021-06-05 13:12:17,439 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95855 to 6601. [2021-06-05 13:12:17,444 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) [2021-06-05 13:12:17,458 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6601 states to 6601 states and 23112 transitions. [2021-06-05 13:12:17,458 INFO L78 Accepts]: Start accepts. Automaton has 6601 states and 23112 transitions. Word has length 22 [2021-06-05 13:12:17,458 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:12:17,458 INFO L482 AbstractCegarLoop]: Abstraction has 6601 states and 23112 transitions. [2021-06-05 13:12:17,459 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) [2021-06-05 13:12:17,459 INFO L276 IsEmpty]: Start isEmpty. Operand 6601 states and 23112 transitions. [2021-06-05 13:12:17,462 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-06-05 13:12:17,462 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:12:17,462 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:12:17,662 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable90,85 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-05 13:12:17,663 INFO L430 AbstractCegarLoop]: === Iteration 46 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:12:17,663 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:12:17,663 INFO L82 PathProgramCache]: Analyzing trace with hash 1093113995, now seen corresponding path program 6 times [2021-06-05 13:12:17,663 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:12:17,663 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [83869071] [2021-06-05 13:12:17,663 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:12:17,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:12:17,735 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 10 proven. 3 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-06-05 13:12:17,735 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:12:17,735 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [83869071] [2021-06-05 13:12:17,735 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [83869071] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:12:17,735 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [308862585] [2021-06-05 13:12:17,735 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 [2021-06-05 13:12:17,756 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-06-05 13:12:17,757 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 13:12:17,757 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 15 conjunts are in the unsatisfiable core [2021-06-05 13:12:17,757 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:12:17,952 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:12:17,952 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [308862585] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:12:17,953 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:12:17,953 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14] total 26 [2021-06-05 13:12:17,953 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [22022632] [2021-06-05 13:12:17,953 INFO L462 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-06-05 13:12:17,953 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:12:17,953 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-06-05 13:12:17,953 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=646, Unknown=0, NotChecked=0, Total=756 [2021-06-05 13:12:17,953 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) [2021-06-05 13:12:24,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:12:24,679 INFO L93 Difference]: Finished difference Result 92250 states and 296739 transitions. [2021-06-05 13:12:24,680 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 265 states. [2021-06-05 13:12:24,680 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 [2021-06-05 13:12:24,680 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:12:24,904 INFO L225 Difference]: With dead ends: 92250 [2021-06-05 13:12:24,904 INFO L226 Difference]: Without dead ends: 90945 [2021-06-05 13:12:24,907 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 296 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 287 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35664 ImplicationChecksByTransitivity, 3882.0ms TimeCoverageRelationStatistics Valid=8830, Invalid=74402, Unknown=0, NotChecked=0, Total=83232 [2021-06-05 13:12:25,233 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90945 states. [2021-06-05 13:12:25,818 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90945 to 6409. [2021-06-05 13:12:25,824 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) [2021-06-05 13:12:25,838 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6409 states to 6409 states and 22556 transitions. [2021-06-05 13:12:25,839 INFO L78 Accepts]: Start accepts. Automaton has 6409 states and 22556 transitions. Word has length 22 [2021-06-05 13:12:25,839 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:12:25,839 INFO L482 AbstractCegarLoop]: Abstraction has 6409 states and 22556 transitions. [2021-06-05 13:12:25,839 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) [2021-06-05 13:12:25,839 INFO L276 IsEmpty]: Start isEmpty. Operand 6409 states and 22556 transitions. [2021-06-05 13:12:25,842 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-06-05 13:12:25,842 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:12:25,843 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:12:26,043 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable91,86 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-05 13:12:26,043 INFO L430 AbstractCegarLoop]: === Iteration 47 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:12:26,043 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:12:26,043 INFO L82 PathProgramCache]: Analyzing trace with hash -201642549, now seen corresponding path program 7 times [2021-06-05 13:12:26,043 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:12:26,044 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [802960869] [2021-06-05 13:12:26,044 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:12:26,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:12:26,090 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-06-05 13:12:26,091 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:12:26,091 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [802960869] [2021-06-05 13:12:26,091 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [802960869] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:12:26,091 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1745357200] [2021-06-05 13:12:26,091 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 [2021-06-05 13:12:26,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:12:26,113 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 15 conjunts are in the unsatisfiable core [2021-06-05 13:12:26,113 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:12:26,276 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 2 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:12:26,276 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1745357200] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:12:26,276 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:12:26,276 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 14] total 23 [2021-06-05 13:12:26,276 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [75011970] [2021-06-05 13:12:26,276 INFO L462 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-06-05 13:12:26,276 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:12:26,277 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-06-05 13:12:26,277 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=511, Unknown=0, NotChecked=0, Total=600 [2021-06-05 13:12:26,277 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) [2021-06-05 13:12:33,376 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:12:33,376 INFO L93 Difference]: Finished difference Result 74180 states and 234629 transitions. [2021-06-05 13:12:33,376 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 256 states. [2021-06-05 13:12:33,376 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 [2021-06-05 13:12:33,377 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:12:33,552 INFO L225 Difference]: With dead ends: 74180 [2021-06-05 13:12:33,552 INFO L226 Difference]: Without dead ends: 70962 [2021-06-05 13:12:33,556 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 286 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 274 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32527 ImplicationChecksByTransitivity, 4486.4ms TimeCoverageRelationStatistics Valid=9287, Invalid=66613, Unknown=0, NotChecked=0, Total=75900 [2021-06-05 13:12:33,806 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70962 states. [2021-06-05 13:12:34,298 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70962 to 6153. [2021-06-05 13:12:34,305 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) [2021-06-05 13:12:34,318 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6153 states to 6153 states and 21503 transitions. [2021-06-05 13:12:34,318 INFO L78 Accepts]: Start accepts. Automaton has 6153 states and 21503 transitions. Word has length 22 [2021-06-05 13:12:34,318 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:12:34,318 INFO L482 AbstractCegarLoop]: Abstraction has 6153 states and 21503 transitions. [2021-06-05 13:12:34,319 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) [2021-06-05 13:12:34,319 INFO L276 IsEmpty]: Start isEmpty. Operand 6153 states and 21503 transitions. [2021-06-05 13:12:34,322 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-06-05 13:12:34,322 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:12:34,322 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:12:34,522 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable92,87 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-05 13:12:34,523 INFO L430 AbstractCegarLoop]: === Iteration 48 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:12:34,523 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:12:34,523 INFO L82 PathProgramCache]: Analyzing trace with hash -1492861591, now seen corresponding path program 8 times [2021-06-05 13:12:34,523 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:12:34,523 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [518057811] [2021-06-05 13:12:34,523 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:12:34,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:12:34,580 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-06-05 13:12:34,580 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:12:34,580 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [518057811] [2021-06-05 13:12:34,580 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [518057811] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:12:34,580 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1520550307] [2021-06-05 13:12:34,580 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 [2021-06-05 13:12:34,602 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-06-05 13:12:34,602 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 13:12:34,603 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 15 conjunts are in the unsatisfiable core [2021-06-05 13:12:34,603 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:12:34,764 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 4 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:12:34,764 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1520550307] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:12:34,764 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:12:34,764 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 14] total 24 [2021-06-05 13:12:34,764 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [390346488] [2021-06-05 13:12:34,765 INFO L462 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-06-05 13:12:34,765 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:12:34,765 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-06-05 13:12:34,765 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=554, Unknown=0, NotChecked=0, Total=650 [2021-06-05 13:12:34,765 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) [2021-06-05 13:12:40,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:12:40,635 INFO L93 Difference]: Finished difference Result 70906 states and 226222 transitions. [2021-06-05 13:12:40,635 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 231 states. [2021-06-05 13:12:40,635 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 [2021-06-05 13:12:40,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:12:40,799 INFO L225 Difference]: With dead ends: 70906 [2021-06-05 13:12:40,799 INFO L226 Difference]: Without dead ends: 68989 [2021-06-05 13:12:40,803 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 261 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 250 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26838 ImplicationChecksByTransitivity, 3438.4ms TimeCoverageRelationStatistics Valid=7791, Invalid=55461, Unknown=0, NotChecked=0, Total=63252 [2021-06-05 13:12:41,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68989 states. [2021-06-05 13:12:41,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68989 to 5660. [2021-06-05 13:12:41,435 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) [2021-06-05 13:12:41,447 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5660 states to 5660 states and 19742 transitions. [2021-06-05 13:12:41,447 INFO L78 Accepts]: Start accepts. Automaton has 5660 states and 19742 transitions. Word has length 22 [2021-06-05 13:12:41,447 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:12:41,448 INFO L482 AbstractCegarLoop]: Abstraction has 5660 states and 19742 transitions. [2021-06-05 13:12:41,448 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) [2021-06-05 13:12:41,448 INFO L276 IsEmpty]: Start isEmpty. Operand 5660 states and 19742 transitions. [2021-06-05 13:12:41,451 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-06-05 13:12:41,451 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:12:41,451 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:12:41,659 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable93,88 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-05 13:12:41,659 INFO L430 AbstractCegarLoop]: === Iteration 49 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:12:41,660 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:12:41,660 INFO L82 PathProgramCache]: Analyzing trace with hash 1087181421, now seen corresponding path program 9 times [2021-06-05 13:12:41,660 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:12:41,660 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [913519450] [2021-06-05 13:12:41,660 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:12:41,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:12:41,709 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 4 proven. 7 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-06-05 13:12:41,709 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:12:41,709 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [913519450] [2021-06-05 13:12:41,709 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [913519450] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:12:41,709 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1750088502] [2021-06-05 13:12:41,709 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 [2021-06-05 13:12:41,730 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-06-05 13:12:41,731 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 13:12:41,731 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 15 conjunts are in the unsatisfiable core [2021-06-05 13:12:41,731 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:12:41,898 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 2 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:12:41,898 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1750088502] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:12:41,898 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:12:41,898 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 14] total 23 [2021-06-05 13:12:41,898 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [7060741] [2021-06-05 13:12:41,898 INFO L462 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-06-05 13:12:41,898 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:12:41,898 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-06-05 13:12:41,898 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=509, Unknown=0, NotChecked=0, Total=600 [2021-06-05 13:12:41,899 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) [2021-06-05 13:12:47,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:12:47,309 INFO L93 Difference]: Finished difference Result 57693 states and 183080 transitions. [2021-06-05 13:12:47,309 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 211 states. [2021-06-05 13:12:47,309 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 [2021-06-05 13:12:47,310 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:12:47,445 INFO L225 Difference]: With dead ends: 57693 [2021-06-05 13:12:47,446 INFO L226 Difference]: Without dead ends: 55111 [2021-06-05 13:12:47,449 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 241 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 229 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22392 ImplicationChecksByTransitivity, 3365.9ms TimeCoverageRelationStatistics Valid=6935, Invalid=46195, Unknown=0, NotChecked=0, Total=53130 [2021-06-05 13:12:47,651 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55111 states. [2021-06-05 13:12:48,008 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55111 to 5609. [2021-06-05 13:12:48,014 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) [2021-06-05 13:12:48,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5609 states to 5609 states and 19498 transitions. [2021-06-05 13:12:48,025 INFO L78 Accepts]: Start accepts. Automaton has 5609 states and 19498 transitions. Word has length 22 [2021-06-05 13:12:48,026 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:12:48,026 INFO L482 AbstractCegarLoop]: Abstraction has 5609 states and 19498 transitions. [2021-06-05 13:12:48,026 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) [2021-06-05 13:12:48,026 INFO L276 IsEmpty]: Start isEmpty. Operand 5609 states and 19498 transitions. [2021-06-05 13:12:48,028 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-06-05 13:12:48,029 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:12:48,029 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:12:48,229 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable94,89 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-05 13:12:48,229 INFO L430 AbstractCegarLoop]: === Iteration 50 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:12:48,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:12:48,229 INFO L82 PathProgramCache]: Analyzing trace with hash -470700853, now seen corresponding path program 10 times [2021-06-05 13:12:48,229 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:12:48,230 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1020439757] [2021-06-05 13:12:48,230 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:12:48,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:12:48,281 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-06-05 13:12:48,282 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:12:48,282 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1020439757] [2021-06-05 13:12:48,282 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1020439757] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:12:48,282 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1351698170] [2021-06-05 13:12:48,282 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 [2021-06-05 13:12:48,303 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-06-05 13:12:48,303 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 13:12:48,304 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 15 conjunts are in the unsatisfiable core [2021-06-05 13:12:48,304 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:12:48,485 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 2 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:12:48,486 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1351698170] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:12:48,486 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:12:48,486 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 14] total 23 [2021-06-05 13:12:48,486 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [451113031] [2021-06-05 13:12:48,486 INFO L462 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-06-05 13:12:48,486 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:12:48,486 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-06-05 13:12:48,486 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=514, Unknown=0, NotChecked=0, Total=600 [2021-06-05 13:12:48,487 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) [2021-06-05 13:12:52,872 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:12:52,872 INFO L93 Difference]: Finished difference Result 55954 states and 178893 transitions. [2021-06-05 13:12:52,872 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 184 states. [2021-06-05 13:12:52,873 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 [2021-06-05 13:12:52,873 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:12:53,005 INFO L225 Difference]: With dead ends: 55954 [2021-06-05 13:12:53,005 INFO L226 Difference]: Without dead ends: 54044 [2021-06-05 13:12:53,007 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 214 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 202 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16907 ImplicationChecksByTransitivity, 2636.8ms TimeCoverageRelationStatistics Valid=4953, Invalid=36459, Unknown=0, NotChecked=0, Total=41412 [2021-06-05 13:12:53,197 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54044 states. [2021-06-05 13:12:53,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54044 to 5470. [2021-06-05 13:12:53,477 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) [2021-06-05 13:12:53,488 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5470 states to 5470 states and 19204 transitions. [2021-06-05 13:12:53,488 INFO L78 Accepts]: Start accepts. Automaton has 5470 states and 19204 transitions. Word has length 22 [2021-06-05 13:12:53,488 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:12:53,488 INFO L482 AbstractCegarLoop]: Abstraction has 5470 states and 19204 transitions. [2021-06-05 13:12:53,488 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) [2021-06-05 13:12:53,488 INFO L276 IsEmpty]: Start isEmpty. Operand 5470 states and 19204 transitions. [2021-06-05 13:12:53,491 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-06-05 13:12:53,491 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:12:53,491 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:12:53,691 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable95,90 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-05 13:12:53,691 INFO L430 AbstractCegarLoop]: === Iteration 51 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:12:53,692 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:12:53,692 INFO L82 PathProgramCache]: Analyzing trace with hash -86651671, now seen corresponding path program 11 times [2021-06-05 13:12:53,692 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:12:53,692 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1034376942] [2021-06-05 13:12:53,692 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:12:53,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:12:53,754 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 9 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-06-05 13:12:53,754 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:12:53,754 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1034376942] [2021-06-05 13:12:53,754 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1034376942] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:12:53,754 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1966609709] [2021-06-05 13:12:53,754 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 [2021-06-05 13:12:53,780 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-06-05 13:12:53,780 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 13:12:53,781 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 15 conjunts are in the unsatisfiable core [2021-06-05 13:12:53,781 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:12:53,947 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 4 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:12:53,948 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1966609709] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:12:53,948 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:12:53,948 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 14] total 25 [2021-06-05 13:12:53,948 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [314284383] [2021-06-05 13:12:53,948 INFO L462 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-06-05 13:12:53,948 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:12:53,948 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-06-05 13:12:53,948 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=602, Unknown=0, NotChecked=0, Total=702 [2021-06-05 13:12:53,948 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) [2021-06-05 13:12:57,960 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:12:57,961 INFO L93 Difference]: Finished difference Result 47195 states and 151255 transitions. [2021-06-05 13:12:57,961 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 161 states. [2021-06-05 13:12:57,961 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 [2021-06-05 13:12:57,961 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:12:58,065 INFO L225 Difference]: With dead ends: 47195 [2021-06-05 13:12:58,065 INFO L226 Difference]: Without dead ends: 45824 [2021-06-05 13:12:58,067 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 182 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13339 ImplicationChecksByTransitivity, 2117.3ms TimeCoverageRelationStatistics Valid=4208, Invalid=29464, Unknown=0, NotChecked=0, Total=33672 [2021-06-05 13:12:58,236 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45824 states. [2021-06-05 13:12:58,478 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45824 to 5419. [2021-06-05 13:12:58,483 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) [2021-06-05 13:12:58,494 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5419 states to 5419 states and 19046 transitions. [2021-06-05 13:12:58,494 INFO L78 Accepts]: Start accepts. Automaton has 5419 states and 19046 transitions. Word has length 22 [2021-06-05 13:12:58,494 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:12:58,495 INFO L482 AbstractCegarLoop]: Abstraction has 5419 states and 19046 transitions. [2021-06-05 13:12:58,495 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) [2021-06-05 13:12:58,495 INFO L276 IsEmpty]: Start isEmpty. Operand 5419 states and 19046 transitions. [2021-06-05 13:12:58,497 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-06-05 13:12:58,497 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:12:58,497 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:12:58,697 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable96,91 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-05 13:12:58,698 INFO L430 AbstractCegarLoop]: === Iteration 52 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:12:58,698 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:12:58,698 INFO L82 PathProgramCache]: Analyzing trace with hash -81890071, now seen corresponding path program 12 times [2021-06-05 13:12:58,698 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:12:58,698 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [740546536] [2021-06-05 13:12:58,698 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:12:58,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:12:58,756 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 9 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-06-05 13:12:58,756 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:12:58,756 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [740546536] [2021-06-05 13:12:58,757 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [740546536] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:12:58,757 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [906502438] [2021-06-05 13:12:58,757 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 [2021-06-05 13:12:58,882 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-06-05 13:12:58,882 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 13:12:58,883 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 15 conjunts are in the unsatisfiable core [2021-06-05 13:12:58,883 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:12:59,066 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 4 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:12:59,066 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [906502438] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:12:59,066 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:12:59,066 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 14] total 25 [2021-06-05 13:12:59,066 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1338394814] [2021-06-05 13:12:59,066 INFO L462 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-06-05 13:12:59,066 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:12:59,068 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-06-05 13:12:59,068 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=602, Unknown=0, NotChecked=0, Total=702 [2021-06-05 13:12:59,068 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) [2021-06-05 13:13:01,522 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:13:01,522 INFO L93 Difference]: Finished difference Result 28103 states and 91207 transitions. [2021-06-05 13:13:01,523 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2021-06-05 13:13:01,523 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 [2021-06-05 13:13:01,523 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:13:01,580 INFO L225 Difference]: With dead ends: 28103 [2021-06-05 13:13:01,581 INFO L226 Difference]: Without dead ends: 26957 [2021-06-05 13:13:01,582 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 121 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5221 ImplicationChecksByTransitivity, 1317.9ms TimeCoverageRelationStatistics Valid=2119, Invalid=12887, Unknown=0, NotChecked=0, Total=15006 [2021-06-05 13:13:01,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26957 states. [2021-06-05 13:13:01,854 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26957 to 5236. [2021-06-05 13:13:01,859 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) [2021-06-05 13:13:01,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5236 states to 5236 states and 18465 transitions. [2021-06-05 13:13:01,870 INFO L78 Accepts]: Start accepts. Automaton has 5236 states and 18465 transitions. Word has length 22 [2021-06-05 13:13:01,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:13:01,870 INFO L482 AbstractCegarLoop]: Abstraction has 5236 states and 18465 transitions. [2021-06-05 13:13:01,870 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) [2021-06-05 13:13:01,870 INFO L276 IsEmpty]: Start isEmpty. Operand 5236 states and 18465 transitions. [2021-06-05 13:13:01,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-06-05 13:13:01,872 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:13:01,872 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:13:02,073 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 92 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable97 [2021-06-05 13:13:02,073 INFO L430 AbstractCegarLoop]: === Iteration 53 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:13:02,073 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:13:02,073 INFO L82 PathProgramCache]: Analyzing trace with hash 551531471, now seen corresponding path program 13 times [2021-06-05 13:13:02,073 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:13:02,073 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [328979024] [2021-06-05 13:13:02,073 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:13:02,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:13:02,127 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-06-05 13:13:02,127 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:13:02,127 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [328979024] [2021-06-05 13:13:02,127 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [328979024] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:13:02,127 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1344712505] [2021-06-05 13:13:02,128 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 [2021-06-05 13:13:02,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:13:02,153 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 15 conjunts are in the unsatisfiable core [2021-06-05 13:13:02,153 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:13:02,344 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:13:02,345 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1344712505] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:13:02,345 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:13:02,345 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 14] total 24 [2021-06-05 13:13:02,345 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [771083800] [2021-06-05 13:13:02,345 INFO L462 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-06-05 13:13:02,345 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:13:02,345 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-06-05 13:13:02,345 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=549, Unknown=0, NotChecked=0, Total=650 [2021-06-05 13:13:02,345 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) [2021-06-05 13:13:05,538 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:13:05,538 INFO L93 Difference]: Finished difference Result 31086 states and 98284 transitions. [2021-06-05 13:13:05,538 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 121 states. [2021-06-05 13:13:05,539 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 [2021-06-05 13:13:05,539 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:13:05,604 INFO L225 Difference]: With dead ends: 31086 [2021-06-05 13:13:05,604 INFO L226 Difference]: Without dead ends: 28949 [2021-06-05 13:13:05,606 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 141 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7469 ImplicationChecksByTransitivity, 1824.0ms TimeCoverageRelationStatistics Valid=3212, Invalid=17094, Unknown=0, NotChecked=0, Total=20306 [2021-06-05 13:13:05,721 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28949 states. [2021-06-05 13:13:05,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28949 to 5023. [2021-06-05 13:13:05,884 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) [2021-06-05 13:13:05,894 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5023 states to 5023 states and 17594 transitions. [2021-06-05 13:13:05,894 INFO L78 Accepts]: Start accepts. Automaton has 5023 states and 17594 transitions. Word has length 22 [2021-06-05 13:13:05,894 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:13:05,894 INFO L482 AbstractCegarLoop]: Abstraction has 5023 states and 17594 transitions. [2021-06-05 13:13:05,894 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) [2021-06-05 13:13:05,894 INFO L276 IsEmpty]: Start isEmpty. Operand 5023 states and 17594 transitions. [2021-06-05 13:13:05,896 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-06-05 13:13:05,897 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:13:05,897 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:13:06,097 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable98,93 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-05 13:13:06,097 INFO L430 AbstractCegarLoop]: === Iteration 54 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:13:06,097 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:13:06,097 INFO L82 PathProgramCache]: Analyzing trace with hash -1006350803, now seen corresponding path program 14 times [2021-06-05 13:13:06,097 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:13:06,097 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [912780837] [2021-06-05 13:13:06,098 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:13:06,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:13:06,151 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 8 proven. 5 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-06-05 13:13:06,151 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:13:06,152 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [912780837] [2021-06-05 13:13:06,152 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [912780837] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:13:06,152 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [806475388] [2021-06-05 13:13:06,152 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2021-06-05 13:13:06,173 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-06-05 13:13:06,173 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 13:13:06,173 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 15 conjunts are in the unsatisfiable core [2021-06-05 13:13:06,173 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:13:06,342 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:13:06,342 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [806475388] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:13:06,342 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:13:06,342 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 14] total 24 [2021-06-05 13:13:06,342 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [570766453] [2021-06-05 13:13:06,343 INFO L462 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-06-05 13:13:06,343 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:13:06,343 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-06-05 13:13:06,343 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=556, Unknown=0, NotChecked=0, Total=650 [2021-06-05 13:13:06,343 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) [2021-06-05 13:13:08,477 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:13:08,477 INFO L93 Difference]: Finished difference Result 29362 states and 93568 transitions. [2021-06-05 13:13:08,478 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 95 states. [2021-06-05 13:13:08,478 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 [2021-06-05 13:13:08,478 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:13:08,539 INFO L225 Difference]: With dead ends: 29362 [2021-06-05 13:13:08,539 INFO L226 Difference]: Without dead ends: 28195 [2021-06-05 13:13:08,540 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4650 ImplicationChecksByTransitivity, 1296.0ms TimeCoverageRelationStatistics Valid=2128, Invalid=11212, Unknown=0, NotChecked=0, Total=13340 [2021-06-05 13:13:08,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28195 states. [2021-06-05 13:13:08,795 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28195 to 4606. [2021-06-05 13:13:08,799 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) [2021-06-05 13:13:08,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4606 states to 4606 states and 16009 transitions. [2021-06-05 13:13:08,808 INFO L78 Accepts]: Start accepts. Automaton has 4606 states and 16009 transitions. Word has length 22 [2021-06-05 13:13:08,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:13:08,808 INFO L482 AbstractCegarLoop]: Abstraction has 4606 states and 16009 transitions. [2021-06-05 13:13:08,808 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) [2021-06-05 13:13:08,808 INFO L276 IsEmpty]: Start isEmpty. Operand 4606 states and 16009 transitions. [2021-06-05 13:13:08,810 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-06-05 13:13:08,810 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:13:08,811 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:13:09,022 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 94 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable99 [2021-06-05 13:13:09,022 INFO L430 AbstractCegarLoop]: === Iteration 55 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:13:09,022 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:13:09,022 INFO L82 PathProgramCache]: Analyzing trace with hash -2046862385, now seen corresponding path program 15 times [2021-06-05 13:13:09,023 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:13:09,023 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1917842663] [2021-06-05 13:13:09,023 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:13:09,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:13:09,072 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-06-05 13:13:09,072 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:13:09,072 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1917842663] [2021-06-05 13:13:09,073 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1917842663] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:13:09,073 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1563123312] [2021-06-05 13:13:09,073 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 [2021-06-05 13:13:09,093 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-06-05 13:13:09,094 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 13:13:09,094 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 15 conjunts are in the unsatisfiable core [2021-06-05 13:13:09,094 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:13:09,254 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:13:09,254 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1563123312] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:13:09,254 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:13:09,254 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 14] total 24 [2021-06-05 13:13:09,254 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [644127343] [2021-06-05 13:13:09,254 INFO L462 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-06-05 13:13:09,254 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:13:09,254 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-06-05 13:13:09,254 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=549, Unknown=0, NotChecked=0, Total=650 [2021-06-05 13:13:09,254 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) [2021-06-05 13:13:11,285 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:13:11,286 INFO L93 Difference]: Finished difference Result 22243 states and 70230 transitions. [2021-06-05 13:13:11,286 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2021-06-05 13:13:11,286 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 [2021-06-05 13:13:11,286 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:13:11,325 INFO L225 Difference]: With dead ends: 22243 [2021-06-05 13:13:11,325 INFO L226 Difference]: Without dead ends: 20872 [2021-06-05 13:13:11,326 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3815 ImplicationChecksByTransitivity, 1213.4ms TimeCoverageRelationStatistics Valid=1927, Invalid=9629, Unknown=0, NotChecked=0, Total=11556 [2021-06-05 13:13:11,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20872 states. [2021-06-05 13:13:11,514 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20872 to 4111. [2021-06-05 13:13:11,518 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) [2021-06-05 13:13:11,526 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4111 states to 4111 states and 14329 transitions. [2021-06-05 13:13:11,526 INFO L78 Accepts]: Start accepts. Automaton has 4111 states and 14329 transitions. Word has length 22 [2021-06-05 13:13:11,526 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:13:11,526 INFO L482 AbstractCegarLoop]: Abstraction has 4111 states and 14329 transitions. [2021-06-05 13:13:11,526 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) [2021-06-05 13:13:11,526 INFO L276 IsEmpty]: Start isEmpty. Operand 4111 states and 14329 transitions. [2021-06-05 13:13:11,527 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-06-05 13:13:11,528 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:13:11,528 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:13:11,728 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable100,95 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-05 13:13:11,728 INFO L430 AbstractCegarLoop]: === Iteration 56 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:13:11,728 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:13:11,728 INFO L82 PathProgramCache]: Analyzing trace with hash 423559405, now seen corresponding path program 16 times [2021-06-05 13:13:11,728 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:13:11,728 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1133600140] [2021-06-05 13:13:11,729 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:13:11,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:13:11,791 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 8 proven. 5 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-06-05 13:13:11,791 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:13:11,791 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1133600140] [2021-06-05 13:13:11,791 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1133600140] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:13:11,791 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [685056016] [2021-06-05 13:13:11,791 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 [2021-06-05 13:13:11,813 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-06-05 13:13:11,814 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 13:13:11,814 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 15 conjunts are in the unsatisfiable core [2021-06-05 13:13:11,814 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:13:11,974 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:13:11,974 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [685056016] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:13:11,974 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:13:11,974 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 14] total 24 [2021-06-05 13:13:11,974 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1469016674] [2021-06-05 13:13:11,974 INFO L462 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-06-05 13:13:11,974 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:13:11,975 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-06-05 13:13:11,975 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=556, Unknown=0, NotChecked=0, Total=650 [2021-06-05 13:13:11,975 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) [2021-06-05 13:13:13,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:13:13,941 INFO L93 Difference]: Finished difference Result 21549 states and 68185 transitions. [2021-06-05 13:13:13,941 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 88 states. [2021-06-05 13:13:13,941 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 [2021-06-05 13:13:13,941 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:13:13,979 INFO L225 Difference]: With dead ends: 21549 [2021-06-05 13:13:13,979 INFO L226 Difference]: Without dead ends: 20229 [2021-06-05 13:13:13,981 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4099 ImplicationChecksByTransitivity, 1190.3ms TimeCoverageRelationStatistics Valid=1956, Invalid=10034, Unknown=0, NotChecked=0, Total=11990 [2021-06-05 13:13:14,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20229 states. [2021-06-05 13:13:14,196 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20229 to 3712. [2021-06-05 13:13:14,200 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) [2021-06-05 13:13:14,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3712 states to 3712 states and 12807 transitions. [2021-06-05 13:13:14,207 INFO L78 Accepts]: Start accepts. Automaton has 3712 states and 12807 transitions. Word has length 22 [2021-06-05 13:13:14,207 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:13:14,207 INFO L482 AbstractCegarLoop]: Abstraction has 3712 states and 12807 transitions. [2021-06-05 13:13:14,207 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) [2021-06-05 13:13:14,207 INFO L276 IsEmpty]: Start isEmpty. Operand 3712 states and 12807 transitions. [2021-06-05 13:13:14,208 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-06-05 13:13:14,208 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:13:14,208 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:13:14,408 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 96 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable101 [2021-06-05 13:13:14,409 INFO L430 AbstractCegarLoop]: === Iteration 57 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:13:14,409 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:13:14,409 INFO L82 PathProgramCache]: Analyzing trace with hash -2047925301, now seen corresponding path program 17 times [2021-06-05 13:13:14,409 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:13:14,409 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2048423516] [2021-06-05 13:13:14,409 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:13:14,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:13:14,467 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 10 proven. 3 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-06-05 13:13:14,467 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:13:14,467 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2048423516] [2021-06-05 13:13:14,467 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2048423516] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:13:14,467 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1901169054] [2021-06-05 13:13:14,467 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 [2021-06-05 13:13:14,495 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-06-05 13:13:14,495 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 13:13:14,496 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 15 conjunts are in the unsatisfiable core [2021-06-05 13:13:14,497 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:13:14,680 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:13:14,680 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1901169054] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:13:14,680 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:13:14,680 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 14] total 25 [2021-06-05 13:13:14,680 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [325954867] [2021-06-05 13:13:14,680 INFO L462 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-06-05 13:13:14,680 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:13:14,681 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-06-05 13:13:14,681 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=600, Unknown=0, NotChecked=0, Total=702 [2021-06-05 13:13:14,681 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) [2021-06-05 13:13:16,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:13:16,460 INFO L93 Difference]: Finished difference Result 20673 states and 65027 transitions. [2021-06-05 13:13:16,460 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 87 states. [2021-06-05 13:13:16,460 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 [2021-06-05 13:13:16,460 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:13:16,498 INFO L225 Difference]: With dead ends: 20673 [2021-06-05 13:13:16,499 INFO L226 Difference]: Without dead ends: 19548 [2021-06-05 13:13:16,500 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4125 ImplicationChecksByTransitivity, 1107.5ms TimeCoverageRelationStatistics Valid=1978, Invalid=10012, Unknown=0, NotChecked=0, Total=11990 [2021-06-05 13:13:16,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19548 states. [2021-06-05 13:13:16,677 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19548 to 3736. [2021-06-05 13:13:16,680 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3736 states, 3706 states have (on average 3.4697787371829465) internal successors, (12859), 3735 states have internal predecessors, (12859), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-05 13:13:16,688 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3736 states to 3736 states and 12859 transitions. [2021-06-05 13:13:16,688 INFO L78 Accepts]: Start accepts. Automaton has 3736 states and 12859 transitions. Word has length 22 [2021-06-05 13:13:16,688 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:13:16,688 INFO L482 AbstractCegarLoop]: Abstraction has 3736 states and 12859 transitions. [2021-06-05 13:13:16,688 INFO L483 AbstractCegarLoop]: Interpolant 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) [2021-06-05 13:13:16,688 INFO L276 IsEmpty]: Start isEmpty. Operand 3736 states and 12859 transitions. [2021-06-05 13:13:16,689 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-06-05 13:13:16,689 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:13:16,689 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:13:16,889 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 97 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable102 [2021-06-05 13:13:16,890 INFO L430 AbstractCegarLoop]: === Iteration 58 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:13:16,890 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:13:16,890 INFO L82 PathProgramCache]: Analyzing trace with hash -2052686901, now seen corresponding path program 18 times [2021-06-05 13:13:16,890 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:13:16,890 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [824184121] [2021-06-05 13:13:16,890 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:13:16,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:13:16,954 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 10 proven. 3 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-06-05 13:13:16,954 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:13:16,954 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [824184121] [2021-06-05 13:13:16,954 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [824184121] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:13:16,954 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [417357171] [2021-06-05 13:13:16,954 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 98 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 98 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-05 13:13:16,975 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-06-05 13:13:16,975 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 13:13:16,976 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 15 conjunts are in the unsatisfiable core [2021-06-05 13:13:16,976 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:13:17,146 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:13:17,146 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [417357171] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:13:17,146 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:13:17,146 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 14] total 25 [2021-06-05 13:13:17,146 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2031378810] [2021-06-05 13:13:17,146 INFO L462 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-06-05 13:13:17,146 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:13:17,146 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-06-05 13:13:17,147 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=600, Unknown=0, NotChecked=0, Total=702 [2021-06-05 13:13:17,147 INFO L87 Difference]: Start difference. First operand 3736 states and 12859 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) [2021-06-05 13:13:18,678 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:13:18,678 INFO L93 Difference]: Finished difference Result 17302 states and 54722 transitions. [2021-06-05 13:13:18,678 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2021-06-05 13:13:18,679 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 [2021-06-05 13:13:18,679 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:13:18,709 INFO L225 Difference]: With dead ends: 17302 [2021-06-05 13:13:18,709 INFO L226 Difference]: Without dead ends: 16060 [2021-06-05 13:13:18,710 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3182 ImplicationChecksByTransitivity, 988.5ms TimeCoverageRelationStatistics Valid=1647, Invalid=8055, Unknown=0, NotChecked=0, Total=9702 [2021-06-05 13:13:18,776 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16060 states. [2021-06-05 13:13:18,863 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16060 to 3547. [2021-06-05 13:13:18,866 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3547 states, 3517 states have (on average 3.475689508103497) internal successors, (12224), 3546 states have internal predecessors, (12224), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-05 13:13:18,873 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3547 states to 3547 states and 12224 transitions. [2021-06-05 13:13:18,873 INFO L78 Accepts]: Start accepts. Automaton has 3547 states and 12224 transitions. Word has length 22 [2021-06-05 13:13:18,873 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:13:18,873 INFO L482 AbstractCegarLoop]: Abstraction has 3547 states and 12224 transitions. [2021-06-05 13:13:18,873 INFO L483 AbstractCegarLoop]: Interpolant 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) [2021-06-05 13:13:18,873 INFO L276 IsEmpty]: Start isEmpty. Operand 3547 states and 12224 transitions. [2021-06-05 13:13:18,874 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-06-05 13:13:18,874 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:13:18,874 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:13:19,074 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 98 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable103 [2021-06-05 13:13:19,075 INFO L430 AbstractCegarLoop]: === Iteration 59 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:13:19,075 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:13:19,075 INFO L82 PathProgramCache]: Analyzing trace with hash -1781988247, now seen corresponding path program 19 times [2021-06-05 13:13:19,075 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:13:19,075 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [297169895] [2021-06-05 13:13:19,075 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:13:19,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:13:19,172 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 12 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:13:19,172 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:13:19,172 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [297169895] [2021-06-05 13:13:19,172 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [297169895] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:13:19,172 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2051698043] [2021-06-05 13:13:19,172 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 99 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 99 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-05 13:13:19,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:13:19,193 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 15 conjunts are in the unsatisfiable core [2021-06-05 13:13:19,194 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:13:19,371 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 12 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:13:19,371 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2051698043] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:13:19,371 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:13:19,371 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 27 [2021-06-05 13:13:19,371 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1575607160] [2021-06-05 13:13:19,372 INFO L462 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-06-05 13:13:19,372 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:13:19,372 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-06-05 13:13:19,372 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=692, Unknown=0, NotChecked=0, Total=812 [2021-06-05 13:13:19,372 INFO L87 Difference]: Start difference. First operand 3547 states and 12224 transitions. Second operand has 29 states, 28 states have (on average 1.5357142857142858) internal successors, (43), 28 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) [2021-06-05 13:13:20,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:13:20,562 INFO L93 Difference]: Finished difference Result 12486 states and 38908 transitions. [2021-06-05 13:13:20,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2021-06-05 13:13:20,562 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 28 states have (on average 1.5357142857142858) internal successors, (43), 28 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 [2021-06-05 13:13:20,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:13:20,582 INFO L225 Difference]: With dead ends: 12486 [2021-06-05 13:13:20,582 INFO L226 Difference]: Without dead ends: 11766 [2021-06-05 13:13:20,583 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2037 ImplicationChecksByTransitivity, 771.2ms TimeCoverageRelationStatistics Valid=1173, Invalid=5633, Unknown=0, NotChecked=0, Total=6806 [2021-06-05 13:13:20,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11766 states. [2021-06-05 13:13:20,698 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11766 to 3493. [2021-06-05 13:13:20,701 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3493 states, 3463 states have (on average 3.4623159110597745) internal successors, (11990), 3492 states have internal predecessors, (11990), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-05 13:13:20,707 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3493 states to 3493 states and 11990 transitions. [2021-06-05 13:13:20,707 INFO L78 Accepts]: Start accepts. Automaton has 3493 states and 11990 transitions. Word has length 22 [2021-06-05 13:13:20,707 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:13:20,707 INFO L482 AbstractCegarLoop]: Abstraction has 3493 states and 11990 transitions. [2021-06-05 13:13:20,707 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 29 states, 28 states have (on average 1.5357142857142858) internal successors, (43), 28 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) [2021-06-05 13:13:20,707 INFO L276 IsEmpty]: Start isEmpty. Operand 3493 states and 11990 transitions. [2021-06-05 13:13:20,708 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-06-05 13:13:20,708 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:13:20,708 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:13:20,908 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable104,99 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-05 13:13:20,909 INFO L430 AbstractCegarLoop]: === Iteration 60 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:13:20,909 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:13:20,909 INFO L82 PathProgramCache]: Analyzing trace with hash -1777226647, now seen corresponding path program 20 times [2021-06-05 13:13:20,909 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:13:20,909 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [386838359] [2021-06-05 13:13:20,909 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:13:20,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:13:20,985 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 12 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:13:20,985 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:13:20,985 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [386838359] [2021-06-05 13:13:20,985 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [386838359] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:13:20,985 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [77284374] [2021-06-05 13:13:20,985 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 100 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 100 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-05 13:13:21,006 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-06-05 13:13:21,006 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 13:13:21,006 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 15 conjunts are in the unsatisfiable core [2021-06-05 13:13:21,007 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:13:21,194 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 12 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:13:21,194 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [77284374] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:13:21,194 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:13:21,194 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 27 [2021-06-05 13:13:21,195 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1280050206] [2021-06-05 13:13:21,195 INFO L462 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-06-05 13:13:21,195 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:13:21,195 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-06-05 13:13:21,195 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=692, Unknown=0, NotChecked=0, Total=812 [2021-06-05 13:13:21,195 INFO L87 Difference]: Start difference. First operand 3493 states and 11990 transitions. Second operand has 29 states, 28 states have (on average 1.5357142857142858) internal successors, (43), 28 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) [2021-06-05 13:13:22,237 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:13:22,237 INFO L93 Difference]: Finished difference Result 9934 states and 31069 transitions. [2021-06-05 13:13:22,237 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2021-06-05 13:13:22,237 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 28 states have (on average 1.5357142857142858) internal successors, (43), 28 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 [2021-06-05 13:13:22,238 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:13:22,252 INFO L225 Difference]: With dead ends: 9934 [2021-06-05 13:13:22,252 INFO L226 Difference]: Without dead ends: 9100 [2021-06-05 13:13:22,253 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1620 ImplicationChecksByTransitivity, 694.3ms TimeCoverageRelationStatistics Valid=1028, Invalid=4672, Unknown=0, NotChecked=0, Total=5700 [2021-06-05 13:13:22,321 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9100 states. [2021-06-05 13:13:22,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9100 to 3358. [2021-06-05 13:13:22,369 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3358 states, 3328 states have (on average 3.4711538461538463) internal successors, (11552), 3357 states have internal predecessors, (11552), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-05 13:13:22,375 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3358 states to 3358 states and 11552 transitions. [2021-06-05 13:13:22,375 INFO L78 Accepts]: Start accepts. Automaton has 3358 states and 11552 transitions. Word has length 22 [2021-06-05 13:13:22,375 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:13:22,375 INFO L482 AbstractCegarLoop]: Abstraction has 3358 states and 11552 transitions. [2021-06-05 13:13:22,375 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 29 states, 28 states have (on average 1.5357142857142858) internal successors, (43), 28 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) [2021-06-05 13:13:22,375 INFO L276 IsEmpty]: Start isEmpty. Operand 3358 states and 11552 transitions. [2021-06-05 13:13:22,376 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-06-05 13:13:22,376 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:13:22,376 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:13:22,576 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 100 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable105 [2021-06-05 13:13:22,576 INFO L430 AbstractCegarLoop]: === Iteration 61 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:13:22,577 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:13:22,577 INFO L82 PathProgramCache]: Analyzing trace with hash 1951118441, now seen corresponding path program 21 times [2021-06-05 13:13:22,577 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:13:22,577 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1600397443] [2021-06-05 13:13:22,577 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:13:22,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:13:22,663 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 12 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:13:22,663 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:13:22,663 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1600397443] [2021-06-05 13:13:22,663 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1600397443] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:13:22,664 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1588842588] [2021-06-05 13:13:22,664 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 101 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 101 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-05 13:13:22,686 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-06-05 13:13:22,686 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 13:13:22,686 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 15 conjunts are in the unsatisfiable core [2021-06-05 13:13:22,687 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:13:22,872 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 12 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:13:22,872 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1588842588] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:13:22,872 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:13:22,872 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 27 [2021-06-05 13:13:22,872 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2100493366] [2021-06-05 13:13:22,873 INFO L462 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-06-05 13:13:22,873 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:13:22,873 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-06-05 13:13:22,873 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=692, Unknown=0, NotChecked=0, Total=812 [2021-06-05 13:13:22,873 INFO L87 Difference]: Start difference. First operand 3358 states and 11552 transitions. Second operand has 29 states, 28 states have (on average 1.5357142857142858) internal successors, (43), 28 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) [2021-06-05 13:13:23,682 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:13:23,683 INFO L93 Difference]: Finished difference Result 7176 states and 22570 transitions. [2021-06-05 13:13:23,683 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-06-05 13:13:23,683 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 28 states have (on average 1.5357142857142858) internal successors, (43), 28 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 [2021-06-05 13:13:23,683 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:13:23,693 INFO L225 Difference]: With dead ends: 7176 [2021-06-05 13:13:23,694 INFO L226 Difference]: Without dead ends: 6456 [2021-06-05 13:13:23,694 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1214 ImplicationChecksByTransitivity, 593.3ms TimeCoverageRelationStatistics Valid=847, Invalid=3709, Unknown=0, NotChecked=0, Total=4556 [2021-06-05 13:13:23,724 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6456 states. [2021-06-05 13:13:23,761 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6456 to 2860. [2021-06-05 13:13:23,763 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2860 states, 2830 states have (on average 3.4063604240282683) internal successors, (9640), 2859 states have internal predecessors, (9640), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-05 13:13:23,768 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2860 states to 2860 states and 9640 transitions. [2021-06-05 13:13:23,768 INFO L78 Accepts]: Start accepts. Automaton has 2860 states and 9640 transitions. Word has length 22 [2021-06-05 13:13:23,768 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:13:23,768 INFO L482 AbstractCegarLoop]: Abstraction has 2860 states and 9640 transitions. [2021-06-05 13:13:23,768 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 29 states, 28 states have (on average 1.5357142857142858) internal successors, (43), 28 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) [2021-06-05 13:13:23,768 INFO L276 IsEmpty]: Start isEmpty. Operand 2860 states and 9640 transitions. [2021-06-05 13:13:23,768 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-06-05 13:13:23,769 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:13:23,769 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:13:23,969 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable106,101 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-05 13:13:23,969 INFO L430 AbstractCegarLoop]: === Iteration 62 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:13:23,969 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:13:23,970 INFO L82 PathProgramCache]: Analyzing trace with hash 1946356841, now seen corresponding path program 22 times [2021-06-05 13:13:23,970 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:13:23,970 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2016526754] [2021-06-05 13:13:23,970 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:13:23,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:13:24,050 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 12 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:13:24,051 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:13:24,051 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2016526754] [2021-06-05 13:13:24,051 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2016526754] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:13:24,051 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1090929767] [2021-06-05 13:13:24,051 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 102 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 102 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-05 13:13:24,071 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-06-05 13:13:24,071 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 13:13:24,072 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 15 conjunts are in the unsatisfiable core [2021-06-05 13:13:24,072 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:13:24,243 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 12 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:13:24,243 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1090929767] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:13:24,243 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:13:24,243 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 27 [2021-06-05 13:13:24,244 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [177451840] [2021-06-05 13:13:24,244 INFO L462 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-06-05 13:13:24,244 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:13:24,244 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-06-05 13:13:24,244 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=692, Unknown=0, NotChecked=0, Total=812 [2021-06-05 13:13:24,244 INFO L87 Difference]: Start difference. First operand 2860 states and 9640 transitions. Second operand has 29 states, 28 states have (on average 1.5357142857142858) internal successors, (43), 28 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) [2021-06-05 13:13:25,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:13:25,133 INFO L93 Difference]: Finished difference Result 6196 states and 18981 transitions. [2021-06-05 13:13:25,133 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-06-05 13:13:25,133 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 28 states have (on average 1.5357142857142858) internal successors, (43), 28 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 [2021-06-05 13:13:25,134 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:13:25,141 INFO L225 Difference]: With dead ends: 6196 [2021-06-05 13:13:25,142 INFO L226 Difference]: Without dead ends: 5359 [2021-06-05 13:13:25,142 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1221 ImplicationChecksByTransitivity, 584.4ms TimeCoverageRelationStatistics Valid=857, Invalid=3699, Unknown=0, NotChecked=0, Total=4556 [2021-06-05 13:13:25,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5359 states. [2021-06-05 13:13:25,200 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5359 to 2719. [2021-06-05 13:13:25,203 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2719 states, 2689 states have (on average 3.4139085161770173) internal successors, (9180), 2718 states have internal predecessors, (9180), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-05 13:13:25,207 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2719 states to 2719 states and 9180 transitions. [2021-06-05 13:13:25,207 INFO L78 Accepts]: Start accepts. Automaton has 2719 states and 9180 transitions. Word has length 22 [2021-06-05 13:13:25,207 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:13:25,208 INFO L482 AbstractCegarLoop]: Abstraction has 2719 states and 9180 transitions. [2021-06-05 13:13:25,208 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 29 states, 28 states have (on average 1.5357142857142858) internal successors, (43), 28 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) [2021-06-05 13:13:25,208 INFO L276 IsEmpty]: Start isEmpty. Operand 2719 states and 9180 transitions. [2021-06-05 13:13:25,208 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-06-05 13:13:25,208 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:13:25,208 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:13:25,411 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 102 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable107 [2021-06-05 13:13:25,411 INFO L430 AbstractCegarLoop]: === Iteration 63 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:13:25,412 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:13:25,412 INFO L82 PathProgramCache]: Analyzing trace with hash -2058156951, now seen corresponding path program 23 times [2021-06-05 13:13:25,412 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:13:25,412 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1415301274] [2021-06-05 13:13:25,412 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:13:25,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:13:25,482 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 12 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:13:25,482 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:13:25,482 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1415301274] [2021-06-05 13:13:25,482 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1415301274] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:13:25,482 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [731868129] [2021-06-05 13:13:25,482 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 103 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 103 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-05 13:13:25,510 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-06-05 13:13:25,510 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 13:13:25,510 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 15 conjunts are in the unsatisfiable core [2021-06-05 13:13:25,511 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:13:25,686 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 12 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:13:25,686 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [731868129] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:13:25,686 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:13:25,686 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 27 [2021-06-05 13:13:25,687 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [894758839] [2021-06-05 13:13:25,687 INFO L462 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-06-05 13:13:25,687 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:13:25,687 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-06-05 13:13:25,687 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=692, Unknown=0, NotChecked=0, Total=812 [2021-06-05 13:13:25,687 INFO L87 Difference]: Start difference. First operand 2719 states and 9180 transitions. Second operand has 29 states, 28 states have (on average 1.5357142857142858) internal successors, (43), 28 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) [2021-06-05 13:13:26,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:13:26,338 INFO L93 Difference]: Finished difference Result 3435 states and 10471 transitions. [2021-06-05 13:13:26,338 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-06-05 13:13:26,339 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 28 states have (on average 1.5357142857142858) internal successors, (43), 28 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 [2021-06-05 13:13:26,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:13:26,342 INFO L225 Difference]: With dead ends: 3435 [2021-06-05 13:13:26,342 INFO L226 Difference]: Without dead ends: 2715 [2021-06-05 13:13:26,343 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 872 ImplicationChecksByTransitivity, 503.3ms TimeCoverageRelationStatistics Valid=676, Invalid=2864, Unknown=0, NotChecked=0, Total=3540 [2021-06-05 13:13:26,359 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2715 states. [2021-06-05 13:13:26,377 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2715 to 2065. [2021-06-05 13:13:26,378 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2065 states, 2035 states have (on average 3.2614250614250615) internal successors, (6637), 2064 states have internal predecessors, (6637), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-05 13:13:26,382 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2065 states to 2065 states and 6637 transitions. [2021-06-05 13:13:26,382 INFO L78 Accepts]: Start accepts. Automaton has 2065 states and 6637 transitions. Word has length 22 [2021-06-05 13:13:26,382 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:13:26,382 INFO L482 AbstractCegarLoop]: Abstraction has 2065 states and 6637 transitions. [2021-06-05 13:13:26,382 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 29 states, 28 states have (on average 1.5357142857142858) internal successors, (43), 28 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) [2021-06-05 13:13:26,382 INFO L276 IsEmpty]: Start isEmpty. Operand 2065 states and 6637 transitions. [2021-06-05 13:13:26,382 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-06-05 13:13:26,382 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:13:26,382 INFO L521 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:13:26,583 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable108,103 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-05 13:13:26,583 INFO L430 AbstractCegarLoop]: === Iteration 64 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:13:26,583 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:13:26,583 INFO L82 PathProgramCache]: Analyzing trace with hash -2067680151, now seen corresponding path program 24 times [2021-06-05 13:13:26,583 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:13:26,583 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [639664392] [2021-06-05 13:13:26,583 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:13:26,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:13:26,673 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 12 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:13:26,673 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:13:26,673 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [639664392] [2021-06-05 13:13:26,673 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [639664392] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:13:26,673 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1414901675] [2021-06-05 13:13:26,673 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 104 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 104 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-05 13:13:26,694 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-06-05 13:13:26,695 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-06-05 13:13:26,695 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 15 conjunts are in the unsatisfiable core [2021-06-05 13:13:26,695 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:13:26,870 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 12 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:13:26,870 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1414901675] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:13:26,870 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:13:26,870 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 27 [2021-06-05 13:13:26,870 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1554095776] [2021-06-05 13:13:26,871 INFO L462 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-06-05 13:13:26,871 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:13:26,871 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-06-05 13:13:26,871 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=692, Unknown=0, NotChecked=0, Total=812 [2021-06-05 13:13:26,871 INFO L87 Difference]: Start difference. First operand 2065 states and 6637 transitions. Second operand has 29 states, 28 states have (on average 1.5357142857142858) internal successors, (43), 28 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) [2021-06-05 13:13:27,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:13:27,341 INFO L93 Difference]: Finished difference Result 883 states and 2641 transitions. [2021-06-05 13:13:27,341 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-06-05 13:13:27,342 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 28 states have (on average 1.5357142857142858) internal successors, (43), 28 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 [2021-06-05 13:13:27,342 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:13:27,342 INFO L225 Difference]: With dead ends: 883 [2021-06-05 13:13:27,342 INFO L226 Difference]: Without dead ends: 0 [2021-06-05 13:13:27,342 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 613 ImplicationChecksByTransitivity, 434.5ms TimeCoverageRelationStatistics Valid=553, Invalid=2203, Unknown=0, NotChecked=0, Total=2756 [2021-06-05 13:13:27,342 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-06-05 13:13:27,342 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-06-05 13:13:27,342 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) [2021-06-05 13:13:27,342 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-06-05 13:13:27,342 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 22 [2021-06-05 13:13:27,342 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:13:27,342 INFO L482 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-06-05 13:13:27,342 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 29 states, 28 states have (on average 1.5357142857142858) internal successors, (43), 28 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) [2021-06-05 13:13:27,342 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-06-05 13:13:27,343 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-06-05 13:13:27,543 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable109,104 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-05 13:13:27,543 INFO L315 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE (1/2) [2021-06-05 13:13:27,543 INFO L255 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-06-05 13:13:27,543 INFO L378 AbstractCegarLoop]: Interprodecural is true [2021-06-05 13:13:27,544 INFO L379 AbstractCegarLoop]: Hoare is false [2021-06-05 13:13:27,544 INFO L380 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-06-05 13:13:27,544 INFO L381 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-06-05 13:13:27,544 INFO L382 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-06-05 13:13:27,544 INFO L383 AbstractCegarLoop]: Difference is false [2021-06-05 13:13:27,544 INFO L384 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-06-05 13:13:27,544 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == InUseError======== [2021-06-05 13:13:27,544 INFO L100 iNet2FiniteAutomaton]: Start petriNet2FiniteAutomaton. Operand has 40 places, 31 transitions, 94 flow [2021-06-05 13:13:27,970 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) [2021-06-05 13:13:27,982 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) [2021-06-05 13:13:27,983 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-06-05 13:13:27,983 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:13:27,984 INFO L521 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:13:27,984 INFO L430 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION]=== [2021-06-05 13:13:27,984 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:13:27,984 INFO L82 PathProgramCache]: Analyzing trace with hash -70359785, now seen corresponding path program 1 times [2021-06-05 13:13:27,984 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:13:27,984 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2029255738] [2021-06-05 13:13:27,984 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:13:27,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-06-05 13:13:27,986 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-06-05 13:13:27,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-06-05 13:13:27,986 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-06-05 13:13:27,987 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-06-05 13:13:27,987 INFO L622 BasicCegarLoop]: Counterexample might be feasible [2021-06-05 13:13:27,987 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable110 [2021-06-05 13:13:27,987 INFO L315 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2021-06-05 13:13:27,987 WARN L242 ceAbstractionStarter]: 4 thread instances were not sufficient, I will increase this number and restart the analysis [2021-06-05 13:13:27,987 INFO L510 ceAbstractionStarter]: Constructing petrified ICFG for 5 thread instances. [2021-06-05 13:13:27,996 WARN L313 ript$VariableManager]: TermVariabe threadThread1of5ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-05 13:13:27,996 WARN L313 ript$VariableManager]: TermVariabe threadThread1of5ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-05 13:13:27,996 WARN L313 ript$VariableManager]: TermVariabe threadThread1of5ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-05 13:13:27,996 WARN L313 ript$VariableManager]: TermVariabe threadThread1of5ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-05 13:13:27,996 WARN L313 ript$VariableManager]: TermVariabe threadThread2of5ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-05 13:13:27,996 WARN L313 ript$VariableManager]: TermVariabe threadThread2of5ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-05 13:13:27,996 WARN L313 ript$VariableManager]: TermVariabe threadThread2of5ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-05 13:13:27,996 WARN L313 ript$VariableManager]: TermVariabe threadThread2of5ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-05 13:13:27,996 WARN L313 ript$VariableManager]: TermVariabe threadThread3of5ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-05 13:13:27,996 WARN L313 ript$VariableManager]: TermVariabe threadThread3of5ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-05 13:13:27,996 WARN L313 ript$VariableManager]: TermVariabe threadThread3of5ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-05 13:13:27,996 WARN L313 ript$VariableManager]: TermVariabe threadThread3of5ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-05 13:13:27,997 WARN L313 ript$VariableManager]: TermVariabe threadThread5of5ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-05 13:13:27,997 WARN L313 ript$VariableManager]: TermVariabe threadThread5of5ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-05 13:13:27,997 WARN L313 ript$VariableManager]: TermVariabe threadThread5of5ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-05 13:13:27,997 WARN L313 ript$VariableManager]: TermVariabe threadThread5of5ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-05 13:13:27,997 WARN L313 ript$VariableManager]: TermVariabe threadThread4of5ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-05 13:13:27,997 WARN L313 ript$VariableManager]: TermVariabe threadThread4of5ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-05 13:13:27,997 WARN L313 ript$VariableManager]: TermVariabe threadThread4of5ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-05 13:13:27,997 WARN L313 ript$VariableManager]: TermVariabe threadThread4of5ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-05 13:13:27,997 WARN L313 ript$VariableManager]: TermVariabe threadThread1of5ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-05 13:13:27,998 WARN L313 ript$VariableManager]: TermVariabe threadThread2of5ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-05 13:13:27,998 WARN L313 ript$VariableManager]: TermVariabe threadThread3of5ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-05 13:13:27,999 WARN L313 ript$VariableManager]: TermVariabe threadThread4of5ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-05 13:13:27,999 WARN L313 ript$VariableManager]: TermVariabe threadThread5of5ForFork0_t not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-05 13:13:28,000 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-06-05 13:13:28,000 INFO L255 AbstractCegarLoop]: Starting to check reachability of 6 error locations. [2021-06-05 13:13:28,000 INFO L378 AbstractCegarLoop]: Interprodecural is true [2021-06-05 13:13:28,000 INFO L379 AbstractCegarLoop]: Hoare is false [2021-06-05 13:13:28,000 INFO L380 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-06-05 13:13:28,000 INFO L381 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-06-05 13:13:28,000 INFO L382 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-06-05 13:13:28,000 INFO L383 AbstractCegarLoop]: Difference is false [2021-06-05 13:13:28,000 INFO L384 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-06-05 13:13:28,000 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-06-05 13:13:28,001 INFO L100 iNet2FiniteAutomaton]: Start petriNet2FiniteAutomaton. Operand has 48 places, 37 transitions, 119 flow [2021-06-05 13:13:46,501 INFO L122 iNet2FiniteAutomaton]: Finished petriNet2FiniteAutomaton. Result has 54432 states, 54337 states have (on average 4.889504389274343) internal successors, (265681), 54431 states have internal predecessors, (265681), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-05 13:13:46,573 INFO L276 IsEmpty]: Start isEmpty. Operand has 54432 states, 54337 states have (on average 4.889504389274343) internal successors, (265681), 54431 states have internal predecessors, (265681), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-05 13:13:46,574 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-06-05 13:13:46,574 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:13:46,574 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:13:46,574 INFO L430 AbstractCegarLoop]: === Iteration 1 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:13:46,574 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:13:46,574 INFO L82 PathProgramCache]: Analyzing trace with hash -96074578, now seen corresponding path program 1 times [2021-06-05 13:13:46,574 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:13:46,574 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2093712380] [2021-06-05 13:13:46,574 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:13:46,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:13:46,599 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:13:46,599 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:13:46,599 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2093712380] [2021-06-05 13:13:46,599 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2093712380] provided 1 perfect and 0 imperfect interpolant sequences [2021-06-05 13:13:46,599 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-06-05 13:13:46,599 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-06-05 13:13:46,599 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [209739010] [2021-06-05 13:13:46,600 INFO L462 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-06-05 13:13:46,600 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:13:46,600 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-06-05 13:13:46,600 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-06-05 13:13:46,673 INFO L87 Difference]: Start difference. First operand has 54432 states, 54337 states have (on average 4.889504389274343) internal successors, (265681), 54431 states have internal predecessors, (265681), 0 states have call successors, (0), 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) [2021-06-05 13:13:47,886 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:13:47,886 INFO L93 Difference]: Finished difference Result 198697 states and 862114 transitions. [2021-06-05 13:13:47,886 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-06-05 13:13:47,886 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 [2021-06-05 13:13:47,886 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:13:48,573 INFO L225 Difference]: With dead ends: 198697 [2021-06-05 13:13:48,573 INFO L226 Difference]: Without dead ends: 193091 [2021-06-05 13:13:48,573 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 49.6ms TimeCoverageRelationStatistics Valid=72, Invalid=138, Unknown=0, NotChecked=0, Total=210 [2021-06-05 13:13:52,143 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193091 states. [2021-06-05 13:13:54,830 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193091 to 91951. [2021-06-05 13:13:54,996 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91951 states, 91864 states have (on average 4.688452494992598) internal successors, (430700), 91950 states have internal predecessors, (430700), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-05 13:13:55,374 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91951 states to 91951 states and 430700 transitions. [2021-06-05 13:13:55,375 INFO L78 Accepts]: Start accepts. Automaton has 91951 states and 430700 transitions. Word has length 7 [2021-06-05 13:13:55,375 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:13:55,375 INFO L482 AbstractCegarLoop]: Abstraction has 91951 states and 430700 transitions. [2021-06-05 13:13:55,375 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) [2021-06-05 13:13:55,375 INFO L276 IsEmpty]: Start isEmpty. Operand 91951 states and 430700 transitions. [2021-06-05 13:13:55,375 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-06-05 13:13:55,375 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:13:55,375 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:13:55,375 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable111 [2021-06-05 13:13:55,375 INFO L430 AbstractCegarLoop]: === Iteration 2 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:13:55,375 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:13:55,375 INFO L82 PathProgramCache]: Analyzing trace with hash -1947837208, now seen corresponding path program 1 times [2021-06-05 13:13:55,376 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:13:55,376 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1203928662] [2021-06-05 13:13:55,376 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:13:55,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:13:55,392 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-06-05 13:13:55,392 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:13:55,392 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1203928662] [2021-06-05 13:13:55,392 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1203928662] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:13:55,392 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [442838740] [2021-06-05 13:13:55,392 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 105 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 105 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-05 13:13:55,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:13:55,412 INFO L263 TraceCheckSpWp]: Trace formula consists of 19 conjuncts, 7 conjunts are in the unsatisfiable core [2021-06-05 13:13:55,412 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-06-05 13:13:55,455 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:13:55,455 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [442838740] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:13:55,455 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:13:55,455 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6] total 10 [2021-06-05 13:13:55,455 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1427828584] [2021-06-05 13:13:55,455 INFO L462 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-06-05 13:13:55,455 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:13:55,455 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-06-05 13:13:55,455 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2021-06-05 13:13:55,456 INFO L87 Difference]: Start difference. First operand 91951 states and 430700 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) [2021-06-05 13:13:58,236 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:13:58,236 INFO L93 Difference]: Finished difference Result 302487 states and 1299378 transitions. [2021-06-05 13:13:58,236 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-06-05 13:13:58,237 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 [2021-06-05 13:13:58,237 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-05 13:13:59,263 INFO L225 Difference]: With dead ends: 302487 [2021-06-05 13:13:59,263 INFO L226 Difference]: Without dead ends: 299871 [2021-06-05 13:13:59,263 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 104.3ms TimeCoverageRelationStatistics Valid=149, Invalid=357, Unknown=0, NotChecked=0, Total=506 [2021-06-05 13:14:03,223 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 299871 states. [2021-06-05 13:14:07,337 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 299871 to 106750. [2021-06-05 13:14:07,468 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106750 states, 106663 states have (on average 4.708530605739572) internal successors, (502226), 106749 states have internal predecessors, (502226), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-05 13:14:07,887 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106750 states to 106750 states and 502226 transitions. [2021-06-05 13:14:07,887 INFO L78 Accepts]: Start accepts. Automaton has 106750 states and 502226 transitions. Word has length 10 [2021-06-05 13:14:07,888 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-05 13:14:07,888 INFO L482 AbstractCegarLoop]: Abstraction has 106750 states and 502226 transitions. [2021-06-05 13:14:07,888 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) [2021-06-05 13:14:07,888 INFO L276 IsEmpty]: Start isEmpty. Operand 106750 states and 502226 transitions. [2021-06-05 13:14:07,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-06-05 13:14:07,888 INFO L513 BasicCegarLoop]: Found error trace [2021-06-05 13:14:07,888 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-05 13:14:08,088 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 105 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable112 [2021-06-05 13:14:08,089 INFO L430 AbstractCegarLoop]: === Iteration 3 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-05 13:14:08,089 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-05 13:14:08,089 INFO L82 PathProgramCache]: Analyzing trace with hash 734181959, now seen corresponding path program 1 times [2021-06-05 13:14:08,089 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-05 13:14:08,089 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [724407837] [2021-06-05 13:14:08,089 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-05 13:14:08,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:14:08,119 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:14:08,119 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-05 13:14:08,119 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [724407837] [2021-06-05 13:14:08,119 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [724407837] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:14:08,119 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [716059491] [2021-06-05 13:14:08,119 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 106 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-06-05 13:14:08,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-05 13:14:08,144 INFO L263 TraceCheckSpWp]: Trace formula consists of 23 conjuncts, 9 conjunts are in the unsatisfiable core [2021-06-05 13:14:08,144 INFO L286 TraceCheckSpWp]: Computing forward predicates... Waiting until toolchain timeout for monitored process 106 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-06-05 13:14:08,220 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-05 13:14:08,220 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [716059491] provided 0 perfect and 1 imperfect interpolant sequences [2021-06-05 13:14:08,220 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-06-05 13:14:08,220 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 15 [2021-06-05 13:14:08,220 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [67842161] [2021-06-05 13:14:08,220 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-06-05 13:14:08,220 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-05 13:14:08,221 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-06-05 13:14:08,221 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=220, Unknown=0, NotChecked=0, Total=272 [2021-06-05 13:14:08,221 INFO L87 Difference]: Start difference. First operand 106750 states and 502226 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) [2021-06-05 13:14:14,572 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-05 13:14:14,573 INFO L93 Difference]: Finished difference Result 708863 states and 2976221 transitions. [2021-06-05 13:14:14,573 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-06-05 13:14:14,573 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 [2021-06-05 13:14:14,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted.