/usr/bin/java -Xmx16000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -s ../../../trunk/examples/settings/automizer/concurrent/svcomp-Reach-32bit-Automizer_Default-noMmResRef-FA-NoLbe.epf -tc ../../../trunk/examples/toolchains/AutomizerBplInline.xml -i ../../../trunk/examples/concurrent/bpl/weaver-benchmarks/generated/popl20-more/sum-fun-alt.wvr.bpl -------------------------------------------------------------------------------- This is Ultimate 0.2.1-a865e3bea3ade1065a4c95009cfa501fe03c5538-a865e3b [2021-02-19 19:27:47,837 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-02-19 19:27:47,840 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-02-19 19:27:47,877 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-02-19 19:27:47,932 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-02-19 19:27:47,932 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-02-19 19:27:47,933 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-02-19 19:27:47,937 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/concurrent/svcomp-Reach-32bit-Automizer_Default-noMmResRef-FA-NoLbe.epf [2021-02-19 19:27:47,976 INFO L113 SettingsManager]: Loading preferences was successful [2021-02-19 19:27:47,976 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-02-19 19:27:47,977 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-02-19 19:27:47,977 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-02-19 19:27:47,979 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-02-19 19:27:47,979 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-02-19 19:27:47,980 INFO L138 SettingsManager]: * Use SBE=true [2021-02-19 19:27:47,980 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-02-19 19:27:47,980 INFO L138 SettingsManager]: * sizeof long=4 [2021-02-19 19:27:47,980 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-02-19 19:27:47,981 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-02-19 19:27:47,981 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-02-19 19:27:47,981 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-02-19 19:27:47,982 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-02-19 19:27:47,982 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-02-19 19:27:47,982 INFO L138 SettingsManager]: * sizeof long double=12 [2021-02-19 19:27:47,982 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-02-19 19:27:47,982 INFO L138 SettingsManager]: * Use constant arrays=true [2021-02-19 19:27:47,982 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-02-19 19:27:47,983 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-02-19 19:27:47,983 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-02-19 19:27:47,983 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-02-19 19:27:47,983 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-02-19 19:27:47,983 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-02-19 19:27:47,983 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-02-19 19:27:47,984 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-02-19 19:27:47,984 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-02-19 19:27:47,984 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-02-19 19:27:47,984 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-02-19 19:27:47,984 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-02-19 19:27:47,984 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-02-19 19:27:47,984 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-02-19 19:27:48,289 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-02-19 19:27:48,312 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-02-19 19:27:48,314 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-02-19 19:27:48,315 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2021-02-19 19:27:48,316 INFO L275 PluginConnector]: Boogie PL CUP Parser initialized [2021-02-19 19:27:48,317 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/weaver-benchmarks/generated/popl20-more/sum-fun-alt.wvr.bpl [2021-02-19 19:27:48,317 INFO L110 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/weaver-benchmarks/generated/popl20-more/sum-fun-alt.wvr.bpl' [2021-02-19 19:27:48,356 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-02-19 19:27:48,361 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-02-19 19:27:48,366 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-02-19 19:27:48,366 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-02-19 19:27:48,366 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-02-19 19:27:48,377 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "sum-fun-alt.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 19.02 07:27:48" (1/1) ... [2021-02-19 19:27:48,388 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "sum-fun-alt.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 19.02 07:27:48" (1/1) ... [2021-02-19 19:27:48,395 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-02-19 19:27:48,396 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-02-19 19:27:48,396 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-02-19 19:27:48,397 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-02-19 19:27:48,404 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "sum-fun-alt.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 19.02 07:27:48" (1/1) ... [2021-02-19 19:27:48,404 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "sum-fun-alt.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 19.02 07:27:48" (1/1) ... [2021-02-19 19:27:48,405 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "sum-fun-alt.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 19.02 07:27:48" (1/1) ... [2021-02-19 19:27:48,405 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "sum-fun-alt.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 19.02 07:27:48" (1/1) ... [2021-02-19 19:27:48,408 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "sum-fun-alt.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 19.02 07:27:48" (1/1) ... [2021-02-19 19:27:48,411 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "sum-fun-alt.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 19.02 07:27:48" (1/1) ... [2021-02-19 19:27:48,412 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "sum-fun-alt.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 19.02 07:27:48" (1/1) ... [2021-02-19 19:27:48,413 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-02-19 19:27:48,415 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-02-19 19:27:48,415 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-02-19 19:27:48,415 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-02-19 19:27:48,417 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "sum-fun-alt.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 19.02 07:27:48" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-02-19 19:27:48,467 INFO L124 BoogieDeclarations]: Specification and implementation of procedure thread1 given in one single declaration [2021-02-19 19:27:48,467 INFO L130 BoogieDeclarations]: Found specification of procedure thread1 [2021-02-19 19:27:48,469 INFO L138 BoogieDeclarations]: Found implementation of procedure thread1 [2021-02-19 19:27:48,470 INFO L124 BoogieDeclarations]: Specification and implementation of procedure thread2 given in one single declaration [2021-02-19 19:27:48,470 INFO L130 BoogieDeclarations]: Found specification of procedure thread2 [2021-02-19 19:27:48,470 INFO L138 BoogieDeclarations]: Found implementation of procedure thread2 [2021-02-19 19:27:48,470 INFO L124 BoogieDeclarations]: Specification and implementation of procedure ULTIMATE.start given in one single declaration [2021-02-19 19:27:48,470 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-02-19 19:27:48,470 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-02-19 19:27:48,470 INFO L124 BoogieDeclarations]: Specification and implementation of procedure thread3 given in one single declaration [2021-02-19 19:27:48,470 INFO L130 BoogieDeclarations]: Found specification of procedure thread3 [2021-02-19 19:27:48,470 INFO L138 BoogieDeclarations]: Found implementation of procedure thread3 [2021-02-19 19:27:48,471 WARN L209 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to SingleStatement [2021-02-19 19:27:48,719 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-02-19 19:27:48,720 INFO L299 CfgBuilder]: Removed 0 assume(true) statements. [2021-02-19 19:27:48,722 INFO L202 PluginConnector]: Adding new model sum-fun-alt.wvr.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.02 07:27:48 BoogieIcfgContainer [2021-02-19 19:27:48,722 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-02-19 19:27:48,723 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-02-19 19:27:48,723 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-02-19 19:27:48,726 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-02-19 19:27:48,726 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "sum-fun-alt.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 19.02 07:27:48" (1/2) ... [2021-02-19 19:27:48,727 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6d1514ee and model type sum-fun-alt.wvr.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.02 07:27:48, skipping insertion in model container [2021-02-19 19:27:48,727 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "sum-fun-alt.wvr.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.02 07:27:48" (2/2) ... [2021-02-19 19:27:48,728 INFO L111 eAbstractionObserver]: Analyzing ICFG sum-fun-alt.wvr.bpl [2021-02-19 19:27:48,732 WARN L142 ceAbstractionStarter]: Switching off computation of Hoare annotation because input is a concurrent program [2021-02-19 19:27:48,732 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-02-19 19:27:48,752 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-02-19 19:27:48,753 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2021-02-19 19:27:48,796 INFO L149 ThreadInstanceAdder]: Constructed 3 joinOtherThreadTransitions. [2021-02-19 19:27:48,810 INFO L253 AbstractCegarLoop]: Starting to check reachability of 4 error locations. [2021-02-19 19:27:48,842 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-02-19 19:27:48,842 INFO L377 AbstractCegarLoop]: Hoare is true [2021-02-19 19:27:48,842 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-02-19 19:27:48,842 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-02-19 19:27:48,843 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-02-19 19:27:48,843 INFO L381 AbstractCegarLoop]: Difference is false [2021-02-19 19:27:48,843 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-02-19 19:27:48,843 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-02-19 19:27:48,850 INFO L100 iNet2FiniteAutomaton]: Start petriNet2FiniteAutomaton. Operand has 36 places, 29 transitions, 82 flow [2021-02-19 19:27:48,900 INFO L122 iNet2FiniteAutomaton]: Finished petriNet2FiniteAutomaton. Result has 114 states, 112 states have (on average 2.8035714285714284) internal successors, (314), 113 states have internal predecessors, (314), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:27:48,902 INFO L276 IsEmpty]: Start isEmpty. Operand has 114 states, 112 states have (on average 2.8035714285714284) internal successors, (314), 113 states have internal predecessors, (314), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:27:48,909 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-02-19 19:27:48,909 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 19:27:48,909 INFO L506 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 19:27:48,909 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 19:27:48,913 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 19:27:48,914 INFO L82 PathProgramCache]: Analyzing trace with hash 885522612, now seen corresponding path program 1 times [2021-02-19 19:27:48,933 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 19:27:48,934 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1133709890] [2021-02-19 19:27:48,934 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 19:27:49,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:27:49,092 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:27:49,092 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1133709890] [2021-02-19 19:27:49,093 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-02-19 19:27:49,093 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-02-19 19:27:49,094 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1817683823] [2021-02-19 19:27:49,097 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-02-19 19:27:49,097 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 19:27:49,106 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-02-19 19:27:49,106 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-02-19 19:27:49,108 INFO L87 Difference]: Start difference. First operand has 114 states, 112 states have (on average 2.8035714285714284) internal successors, (314), 113 states have internal predecessors, (314), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 6.0) internal successors, (18), 3 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:27:49,138 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 19:27:49,138 INFO L93 Difference]: Finished difference Result 217 states and 617 transitions. [2021-02-19 19:27:49,138 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-02-19 19:27:49,139 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 6.0) internal successors, (18), 3 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2021-02-19 19:27:49,140 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 19:27:49,150 INFO L225 Difference]: With dead ends: 217 [2021-02-19 19:27:49,150 INFO L226 Difference]: Without dead ends: 202 [2021-02-19 19:27:49,151 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-02-19 19:27:49,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2021-02-19 19:27:49,193 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 149. [2021-02-19 19:27:49,194 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 149 states, 148 states have (on average 2.831081081081081) internal successors, (419), 148 states have internal predecessors, (419), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:27:49,197 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 419 transitions. [2021-02-19 19:27:49,198 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 419 transitions. Word has length 18 [2021-02-19 19:27:49,199 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 19:27:49,199 INFO L480 AbstractCegarLoop]: Abstraction has 149 states and 419 transitions. [2021-02-19 19:27:49,199 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 6.0) internal successors, (18), 3 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:27:49,199 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 419 transitions. [2021-02-19 19:27:49,201 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-02-19 19:27:49,201 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 19:27:49,201 INFO L506 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 19:27:49,202 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-02-19 19:27:49,202 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 19:27:49,203 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 19:27:49,203 INFO L82 PathProgramCache]: Analyzing trace with hash -1950662060, now seen corresponding path program 1 times [2021-02-19 19:27:49,205 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 19:27:49,205 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1092080890] [2021-02-19 19:27:49,205 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 19:27:49,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:27:49,255 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-02-19 19:27:49,256 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1092080890] [2021-02-19 19:27:49,256 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-02-19 19:27:49,256 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-02-19 19:27:49,256 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1849877589] [2021-02-19 19:27:49,257 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-02-19 19:27:49,258 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 19:27:49,258 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-02-19 19:27:49,259 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-02-19 19:27:49,259 INFO L87 Difference]: Start difference. First operand 149 states and 419 transitions. Second operand has 4 states, 4 states have (on average 5.0) internal successors, (20), 4 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:27:49,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 19:27:49,297 INFO L93 Difference]: Finished difference Result 158 states and 445 transitions. [2021-02-19 19:27:49,298 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-02-19 19:27:49,298 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 5.0) internal successors, (20), 4 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-02-19 19:27:49,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 19:27:49,300 INFO L225 Difference]: With dead ends: 158 [2021-02-19 19:27:49,300 INFO L226 Difference]: Without dead ends: 158 [2021-02-19 19:27:49,301 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-02-19 19:27:49,302 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 158 states. [2021-02-19 19:27:49,313 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 158 to 133. [2021-02-19 19:27:49,313 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 132 states have (on average 2.8333333333333335) internal successors, (374), 132 states have internal predecessors, (374), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:27:49,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 374 transitions. [2021-02-19 19:27:49,315 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 374 transitions. Word has length 20 [2021-02-19 19:27:49,316 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 19:27:49,316 INFO L480 AbstractCegarLoop]: Abstraction has 133 states and 374 transitions. [2021-02-19 19:27:49,316 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 5.0) internal successors, (20), 4 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:27:49,316 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 374 transitions. [2021-02-19 19:27:49,317 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-02-19 19:27:49,317 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 19:27:49,317 INFO L506 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 19:27:49,318 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-02-19 19:27:49,318 INFO L428 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 19:27:49,318 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 19:27:49,319 INFO L82 PathProgramCache]: Analyzing trace with hash -341577454, now seen corresponding path program 1 times [2021-02-19 19:27:49,319 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 19:27:49,319 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1772601301] [2021-02-19 19:27:49,319 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 19:27:49,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:27:49,382 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-02-19 19:27:49,382 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1772601301] [2021-02-19 19:27:49,382 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-02-19 19:27:49,382 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-02-19 19:27:49,383 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [429394401] [2021-02-19 19:27:49,383 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-02-19 19:27:49,383 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 19:27:49,384 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-02-19 19:27:49,384 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-02-19 19:27:49,384 INFO L87 Difference]: Start difference. First operand 133 states and 374 transitions. Second operand has 5 states, 5 states have (on average 4.0) internal successors, (20), 4 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:27:49,445 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 19:27:49,445 INFO L93 Difference]: Finished difference Result 183 states and 522 transitions. [2021-02-19 19:27:49,447 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-02-19 19:27:49,448 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.0) internal successors, (20), 4 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-02-19 19:27:49,448 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 19:27:49,449 INFO L225 Difference]: With dead ends: 183 [2021-02-19 19:27:49,449 INFO L226 Difference]: Without dead ends: 183 [2021-02-19 19:27:49,450 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-02-19 19:27:49,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 183 states. [2021-02-19 19:27:49,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 183 to 158. [2021-02-19 19:27:49,461 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 158 states, 157 states have (on average 2.8535031847133756) internal successors, (448), 157 states have internal predecessors, (448), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:27:49,473 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 158 states to 158 states and 448 transitions. [2021-02-19 19:27:49,473 INFO L78 Accepts]: Start accepts. Automaton has 158 states and 448 transitions. Word has length 20 [2021-02-19 19:27:49,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 19:27:49,473 INFO L480 AbstractCegarLoop]: Abstraction has 158 states and 448 transitions. [2021-02-19 19:27:49,473 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 4.0) internal successors, (20), 4 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:27:49,473 INFO L276 IsEmpty]: Start isEmpty. Operand 158 states and 448 transitions. [2021-02-19 19:27:49,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-02-19 19:27:49,475 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 19:27:49,475 INFO L506 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 19:27:49,475 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-02-19 19:27:49,475 INFO L428 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 19:27:49,476 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 19:27:49,476 INFO L82 PathProgramCache]: Analyzing trace with hash 1389185714, now seen corresponding path program 1 times [2021-02-19 19:27:49,476 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 19:27:49,476 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [698927818] [2021-02-19 19:27:49,477 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 19:27:49,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:27:49,781 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:27:49,781 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [698927818] [2021-02-19 19:27:49,781 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [352436932] [2021-02-19 19:27:49,782 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 19:27:49,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:27:49,836 INFO L263 TraceCheckSpWp]: Trace formula consists of 56 conjuncts, 16 conjunts are in the unsatisfiable core [2021-02-19 19:27:49,841 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 19:27:50,158 INFO L354 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2021-02-19 19:27:50,158 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 26 [2021-02-19 19:27:50,171 INFO L550 ElimStorePlain]: Start of recursive call 2: 1 dim-0 vars, End of recursive call: and 1 xjuncts. [2021-02-19 19:27:50,176 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-02-19 19:27:50,181 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-02-19 19:27:50,182 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:33, output treesize:3 [2021-02-19 19:27:50,215 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:27:50,216 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 19:27:50,216 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 12 [2021-02-19 19:27:50,216 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [983032812] [2021-02-19 19:27:50,217 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-02-19 19:27:50,217 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 19:27:50,218 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-02-19 19:27:50,219 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=120, Unknown=0, NotChecked=0, Total=156 [2021-02-19 19:27:50,219 INFO L87 Difference]: Start difference. First operand 158 states and 448 transitions. Second operand has 13 states, 13 states have (on average 2.8461538461538463) internal successors, (37), 12 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) [2021-02-19 19:27:50,548 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 19:27:50,549 INFO L93 Difference]: Finished difference Result 330 states and 935 transitions. [2021-02-19 19:27:50,549 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-02-19 19:27:50,549 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.8461538461538463) internal successors, (37), 12 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 22 [2021-02-19 19:27:50,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 19:27:50,555 INFO L225 Difference]: With dead ends: 330 [2021-02-19 19:27:50,555 INFO L226 Difference]: Without dead ends: 315 [2021-02-19 19:27:50,555 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=75, Invalid=231, Unknown=0, NotChecked=0, Total=306 [2021-02-19 19:27:50,558 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 315 states. [2021-02-19 19:27:50,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 315 to 224. [2021-02-19 19:27:50,582 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 224 states, 223 states have (on average 2.8699551569506725) internal successors, (640), 223 states have internal predecessors, (640), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:27:50,583 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 224 states to 224 states and 640 transitions. [2021-02-19 19:27:50,583 INFO L78 Accepts]: Start accepts. Automaton has 224 states and 640 transitions. Word has length 22 [2021-02-19 19:27:50,584 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 19:27:50,584 INFO L480 AbstractCegarLoop]: Abstraction has 224 states and 640 transitions. [2021-02-19 19:27:50,584 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.8461538461538463) internal successors, (37), 12 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) [2021-02-19 19:27:50,584 INFO L276 IsEmpty]: Start isEmpty. Operand 224 states and 640 transitions. [2021-02-19 19:27:50,586 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-02-19 19:27:50,586 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 19:27:50,586 INFO L506 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 19:27:50,803 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 19:27:50,803 INFO L428 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 19:27:50,804 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 19:27:50,804 INFO L82 PathProgramCache]: Analyzing trace with hash 1221376622, now seen corresponding path program 2 times [2021-02-19 19:27:50,804 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 19:27:50,804 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1114852197] [2021-02-19 19:27:50,805 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 19:27:50,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:27:51,016 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:27:51,017 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1114852197] [2021-02-19 19:27:51,017 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [971209354] [2021-02-19 19:27:51,017 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 19:27:51,070 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-02-19 19:27:51,070 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 19:27:51,071 INFO L263 TraceCheckSpWp]: Trace formula consists of 56 conjuncts, 16 conjunts are in the unsatisfiable core [2021-02-19 19:27:51,073 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 19:27:51,218 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-02-19 19:27:51,218 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 32 treesize of output 33 [2021-02-19 19:27:51,233 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 3 xjuncts. [2021-02-19 19:27:51,264 INFO L628 ElimStorePlain]: treesize reduction 7, result has 77.4 percent of original size [2021-02-19 19:27:51,281 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-02-19 19:27:51,281 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:38, output treesize:21 [2021-02-19 19:27:51,351 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:27:51,352 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 19:27:51,352 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8] total 12 [2021-02-19 19:27:51,352 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [764444250] [2021-02-19 19:27:51,352 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-02-19 19:27:51,353 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 19:27:51,353 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-02-19 19:27:51,353 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2021-02-19 19:27:51,354 INFO L87 Difference]: Start difference. First operand 224 states and 640 transitions. Second operand has 13 states, 13 states have (on average 2.6923076923076925) internal successors, (35), 12 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:27:51,911 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 19:27:51,911 INFO L93 Difference]: Finished difference Result 406 states and 1173 transitions. [2021-02-19 19:27:51,912 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-02-19 19:27:51,912 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.6923076923076925) internal successors, (35), 12 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-02-19 19:27:51,912 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 19:27:51,915 INFO L225 Difference]: With dead ends: 406 [2021-02-19 19:27:51,915 INFO L226 Difference]: Without dead ends: 391 [2021-02-19 19:27:51,916 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=106, Invalid=314, Unknown=0, NotChecked=0, Total=420 [2021-02-19 19:27:51,917 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 391 states. [2021-02-19 19:27:51,926 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 391 to 229. [2021-02-19 19:27:51,926 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 229 states, 228 states have (on average 2.912280701754386) internal successors, (664), 228 states have internal predecessors, (664), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:27:51,928 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 229 states to 229 states and 664 transitions. [2021-02-19 19:27:51,928 INFO L78 Accepts]: Start accepts. Automaton has 229 states and 664 transitions. Word has length 22 [2021-02-19 19:27:51,928 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 19:27:51,928 INFO L480 AbstractCegarLoop]: Abstraction has 229 states and 664 transitions. [2021-02-19 19:27:51,928 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.6923076923076925) internal successors, (35), 12 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:27:51,928 INFO L276 IsEmpty]: Start isEmpty. Operand 229 states and 664 transitions. [2021-02-19 19:27:51,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-02-19 19:27:51,930 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 19:27:51,930 INFO L506 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 19:27:52,150 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 19:27:52,150 INFO L428 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 19:27:52,151 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 19:27:52,151 INFO L82 PathProgramCache]: Analyzing trace with hash 1520150070, now seen corresponding path program 3 times [2021-02-19 19:27:52,151 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 19:27:52,151 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [71859320] [2021-02-19 19:27:52,152 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 19:27:52,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:27:52,271 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:27:52,271 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [71859320] [2021-02-19 19:27:52,271 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1100470251] [2021-02-19 19:27:52,272 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 19:27:52,324 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-02-19 19:27:52,325 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 19:27:52,325 INFO L263 TraceCheckSpWp]: Trace formula consists of 56 conjuncts, 15 conjunts are in the unsatisfiable core [2021-02-19 19:27:52,327 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 19:27:52,420 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-02-19 19:27:52,422 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-02-19 19:27:52,423 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-02-19 19:27:52,424 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-02-19 19:27:52,424 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:11, output treesize:3 [2021-02-19 19:27:52,456 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:27:52,456 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 19:27:52,462 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2021-02-19 19:27:52,462 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [730395227] [2021-02-19 19:27:52,462 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-02-19 19:27:52,462 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 19:27:52,463 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-02-19 19:27:52,463 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=79, Unknown=0, NotChecked=0, Total=110 [2021-02-19 19:27:52,463 INFO L87 Difference]: Start difference. First operand 229 states and 664 transitions. Second operand has 11 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 10 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) [2021-02-19 19:27:52,623 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 19:27:52,624 INFO L93 Difference]: Finished difference Result 363 states and 1038 transitions. [2021-02-19 19:27:52,624 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-02-19 19:27:52,625 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 10 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 22 [2021-02-19 19:27:52,626 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 19:27:52,628 INFO L225 Difference]: With dead ends: 363 [2021-02-19 19:27:52,628 INFO L226 Difference]: Without dead ends: 348 [2021-02-19 19:27:52,629 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 17 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=147, Unknown=0, NotChecked=0, Total=210 [2021-02-19 19:27:52,630 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 348 states. [2021-02-19 19:27:52,638 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 348 to 241. [2021-02-19 19:27:52,638 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 241 states, 240 states have (on average 2.8916666666666666) internal successors, (694), 240 states have internal predecessors, (694), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:27:52,640 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 241 states to 241 states and 694 transitions. [2021-02-19 19:27:52,640 INFO L78 Accepts]: Start accepts. Automaton has 241 states and 694 transitions. Word has length 22 [2021-02-19 19:27:52,640 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 19:27:52,640 INFO L480 AbstractCegarLoop]: Abstraction has 241 states and 694 transitions. [2021-02-19 19:27:52,640 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 10 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) [2021-02-19 19:27:52,641 INFO L276 IsEmpty]: Start isEmpty. Operand 241 states and 694 transitions. [2021-02-19 19:27:52,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-02-19 19:27:52,641 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 19:27:52,642 INFO L506 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 19:27:52,863 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 19:27:52,864 INFO L428 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 19:27:52,864 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 19:27:52,864 INFO L82 PathProgramCache]: Analyzing trace with hash -1203991626, now seen corresponding path program 4 times [2021-02-19 19:27:52,865 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 19:27:52,865 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [425420716] [2021-02-19 19:27:52,865 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 19:27:52,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:27:53,017 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:27:53,017 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [425420716] [2021-02-19 19:27:53,018 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1174915916] [2021-02-19 19:27:53,018 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 19:27:53,050 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-02-19 19:27:53,050 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 19:27:53,054 INFO L263 TraceCheckSpWp]: Trace formula consists of 56 conjuncts, 16 conjunts are in the unsatisfiable core [2021-02-19 19:27:53,055 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 19:27:53,165 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-02-19 19:27:53,166 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 32 treesize of output 33 [2021-02-19 19:27:53,176 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 3 xjuncts. [2021-02-19 19:27:53,200 INFO L628 ElimStorePlain]: treesize reduction 7, result has 78.8 percent of original size [2021-02-19 19:27:53,208 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-02-19 19:27:53,208 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:40, output treesize:21 [2021-02-19 19:27:53,283 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:27:53,283 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 19:27:53,284 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 12 [2021-02-19 19:27:53,284 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2068744248] [2021-02-19 19:27:53,285 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-02-19 19:27:53,285 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 19:27:53,285 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-02-19 19:27:53,285 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2021-02-19 19:27:53,286 INFO L87 Difference]: Start difference. First operand 241 states and 694 transitions. Second operand has 13 states, 13 states have (on average 2.4615384615384617) internal successors, (32), 12 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:27:53,578 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 19:27:53,579 INFO L93 Difference]: Finished difference Result 429 states and 1249 transitions. [2021-02-19 19:27:53,579 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-02-19 19:27:53,579 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.4615384615384617) internal successors, (32), 12 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 22 [2021-02-19 19:27:53,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 19:27:53,582 INFO L225 Difference]: With dead ends: 429 [2021-02-19 19:27:53,582 INFO L226 Difference]: Without dead ends: 414 [2021-02-19 19:27:53,583 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=95, Invalid=211, Unknown=0, NotChecked=0, Total=306 [2021-02-19 19:27:53,584 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 414 states. [2021-02-19 19:27:53,590 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 414 to 247. [2021-02-19 19:27:53,590 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 247 states, 246 states have (on average 2.9186991869918697) internal successors, (718), 246 states have internal predecessors, (718), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:27:53,592 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 247 states to 247 states and 718 transitions. [2021-02-19 19:27:53,592 INFO L78 Accepts]: Start accepts. Automaton has 247 states and 718 transitions. Word has length 22 [2021-02-19 19:27:53,593 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 19:27:53,593 INFO L480 AbstractCegarLoop]: Abstraction has 247 states and 718 transitions. [2021-02-19 19:27:53,594 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.4615384615384617) internal successors, (32), 12 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:27:53,594 INFO L276 IsEmpty]: Start isEmpty. Operand 247 states and 718 transitions. [2021-02-19 19:27:53,594 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-02-19 19:27:53,595 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 19:27:53,595 INFO L506 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 19:27:53,812 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 19:27:53,812 INFO L428 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 19:27:53,812 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 19:27:53,813 INFO L82 PathProgramCache]: Analyzing trace with hash -1742444080, now seen corresponding path program 5 times [2021-02-19 19:27:53,813 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 19:27:53,813 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1816293748] [2021-02-19 19:27:53,813 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 19:27:53,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:27:53,879 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:27:53,880 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1816293748] [2021-02-19 19:27:53,880 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1629434025] [2021-02-19 19:27:53,880 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-02-19 19:27:53,935 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-02-19 19:27:53,935 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 19:27:53,936 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 7 conjunts are in the unsatisfiable core [2021-02-19 19:27:53,938 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 19:27:54,031 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:27:54,031 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 19:27:54,031 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 12 [2021-02-19 19:27:54,032 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [348789296] [2021-02-19 19:27:54,033 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-02-19 19:27:54,033 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 19:27:54,034 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-02-19 19:27:54,034 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2021-02-19 19:27:54,034 INFO L87 Difference]: Start difference. First operand 247 states and 718 transitions. Second operand has 12 states, 12 states have (on average 3.0833333333333335) internal successors, (37), 12 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) [2021-02-19 19:27:54,455 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 19:27:54,456 INFO L93 Difference]: Finished difference Result 619 states and 1783 transitions. [2021-02-19 19:27:54,456 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-02-19 19:27:54,456 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.0833333333333335) internal successors, (37), 12 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 24 [2021-02-19 19:27:54,457 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 19:27:54,462 INFO L225 Difference]: With dead ends: 619 [2021-02-19 19:27:54,462 INFO L226 Difference]: Without dead ends: 619 [2021-02-19 19:27:54,462 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=210, Invalid=602, Unknown=0, NotChecked=0, Total=812 [2021-02-19 19:27:54,463 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 619 states. [2021-02-19 19:27:54,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 619 to 297. [2021-02-19 19:27:54,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 297 states, 296 states have (on average 3.050675675675676) internal successors, (903), 296 states have internal predecessors, (903), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:27:54,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 297 states to 297 states and 903 transitions. [2021-02-19 19:27:54,473 INFO L78 Accepts]: Start accepts. Automaton has 297 states and 903 transitions. Word has length 24 [2021-02-19 19:27:54,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 19:27:54,473 INFO L480 AbstractCegarLoop]: Abstraction has 297 states and 903 transitions. [2021-02-19 19:27:54,473 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 3.0833333333333335) internal successors, (37), 12 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) [2021-02-19 19:27:54,473 INFO L276 IsEmpty]: Start isEmpty. Operand 297 states and 903 transitions. [2021-02-19 19:27:54,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-02-19 19:27:54,475 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 19:27:54,475 INFO L506 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 19:27:54,698 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-02-19 19:27:54,698 INFO L428 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 19:27:54,699 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 19:27:54,699 INFO L82 PathProgramCache]: Analyzing trace with hash 1576204372, now seen corresponding path program 6 times [2021-02-19 19:27:54,699 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 19:27:54,699 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1021508543] [2021-02-19 19:27:54,699 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 19:27:54,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:27:54,751 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:27:54,752 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1021508543] [2021-02-19 19:27:54,752 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1335114462] [2021-02-19 19:27:54,752 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-02-19 19:27:54,794 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-02-19 19:27:54,794 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 19:27:54,795 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 7 conjunts are in the unsatisfiable core [2021-02-19 19:27:54,799 INFO L286 TraceCheckSpWp]: Computing forward predicates... Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 19:27:54,901 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:27:54,902 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 19:27:54,902 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 13 [2021-02-19 19:27:54,902 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1685865742] [2021-02-19 19:27:54,902 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-02-19 19:27:54,902 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 19:27:54,903 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-02-19 19:27:54,903 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=120, Unknown=0, NotChecked=0, Total=156 [2021-02-19 19:27:54,903 INFO L87 Difference]: Start difference. First operand 297 states and 903 transitions. Second operand has 13 states, 13 states have (on average 3.0) internal successors, (39), 13 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) [2021-02-19 19:27:55,740 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 19:27:55,740 INFO L93 Difference]: Finished difference Result 1078 states and 2992 transitions. [2021-02-19 19:27:55,741 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-02-19 19:27:55,741 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 3.0) internal successors, (39), 13 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 24 [2021-02-19 19:27:55,741 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 19:27:55,746 INFO L225 Difference]: With dead ends: 1078 [2021-02-19 19:27:55,746 INFO L226 Difference]: Without dead ends: 1078 [2021-02-19 19:27:55,747 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 800 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=540, Invalid=2010, Unknown=0, NotChecked=0, Total=2550 [2021-02-19 19:27:55,749 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1078 states. [2021-02-19 19:27:55,763 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1078 to 302. [2021-02-19 19:27:55,763 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 302 states, 301 states have (on average 3.083056478405316) internal successors, (928), 301 states have internal predecessors, (928), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:27:55,765 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 302 states to 302 states and 928 transitions. [2021-02-19 19:27:55,765 INFO L78 Accepts]: Start accepts. Automaton has 302 states and 928 transitions. Word has length 24 [2021-02-19 19:27:55,765 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 19:27:55,765 INFO L480 AbstractCegarLoop]: Abstraction has 302 states and 928 transitions. [2021-02-19 19:27:55,765 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 3.0) internal successors, (39), 13 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) [2021-02-19 19:27:55,765 INFO L276 IsEmpty]: Start isEmpty. Operand 302 states and 928 transitions. [2021-02-19 19:27:55,767 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-02-19 19:27:55,767 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 19:27:55,767 INFO L506 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 19:27:55,989 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 19:27:55,990 INFO L428 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 19:27:55,990 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 19:27:55,990 INFO L82 PathProgramCache]: Analyzing trace with hash 2143156452, now seen corresponding path program 7 times [2021-02-19 19:27:55,990 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 19:27:55,990 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1660041866] [2021-02-19 19:27:55,990 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 19:27:56,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:27:56,047 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:27:56,048 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1660041866] [2021-02-19 19:27:56,048 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [96991030] [2021-02-19 19:27:56,048 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 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 19:27:56,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:27:56,085 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 7 conjunts are in the unsatisfiable core [2021-02-19 19:27:56,086 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 19:27:56,177 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:27:56,178 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 19:27:56,178 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 13 [2021-02-19 19:27:56,178 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1190537844] [2021-02-19 19:27:56,178 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-02-19 19:27:56,178 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 19:27:56,179 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-02-19 19:27:56,179 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=120, Unknown=0, NotChecked=0, Total=156 [2021-02-19 19:27:56,179 INFO L87 Difference]: Start difference. First operand 302 states and 928 transitions. Second operand has 13 states, 13 states have (on average 3.0) internal successors, (39), 13 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) [2021-02-19 19:27:56,885 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 19:27:56,885 INFO L93 Difference]: Finished difference Result 951 states and 2692 transitions. [2021-02-19 19:27:56,885 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-02-19 19:27:56,886 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 3.0) internal successors, (39), 13 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 24 [2021-02-19 19:27:56,886 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 19:27:56,890 INFO L225 Difference]: With dead ends: 951 [2021-02-19 19:27:56,890 INFO L226 Difference]: Without dead ends: 951 [2021-02-19 19:27:56,891 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 686 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=479, Invalid=1777, Unknown=0, NotChecked=0, Total=2256 [2021-02-19 19:27:56,893 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 951 states. [2021-02-19 19:27:56,903 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 951 to 293. [2021-02-19 19:27:56,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 293 states, 292 states have (on average 3.0616438356164384) internal successors, (894), 292 states have internal predecessors, (894), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:27:56,905 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 293 states to 293 states and 894 transitions. [2021-02-19 19:27:56,905 INFO L78 Accepts]: Start accepts. Automaton has 293 states and 894 transitions. Word has length 24 [2021-02-19 19:27:56,905 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 19:27:56,906 INFO L480 AbstractCegarLoop]: Abstraction has 293 states and 894 transitions. [2021-02-19 19:27:56,906 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 3.0) internal successors, (39), 13 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) [2021-02-19 19:27:56,906 INFO L276 IsEmpty]: Start isEmpty. Operand 293 states and 894 transitions. [2021-02-19 19:27:56,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-02-19 19:27:56,907 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 19:27:56,907 INFO L506 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 19:27:57,128 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-02-19 19:27:57,129 INFO L428 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 19:27:57,129 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 19:27:57,129 INFO L82 PathProgramCache]: Analyzing trace with hash -1215672172, now seen corresponding path program 1 times [2021-02-19 19:27:57,129 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 19:27:57,130 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2091459517] [2021-02-19 19:27:57,130 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 19:27:57,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:27:57,168 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-02-19 19:27:57,169 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2091459517] [2021-02-19 19:27:57,169 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [898703325] [2021-02-19 19:27:57,169 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 19:27:57,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:27:57,201 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 5 conjunts are in the unsatisfiable core [2021-02-19 19:27:57,203 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 19:27:57,262 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-02-19 19:27:57,263 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 19:27:57,263 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 8 [2021-02-19 19:27:57,263 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1554174548] [2021-02-19 19:27:57,264 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-02-19 19:27:57,264 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 19:27:57,265 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-02-19 19:27:57,265 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-02-19 19:27:57,265 INFO L87 Difference]: Start difference. First operand 293 states and 894 transitions. Second operand has 8 states, 8 states have (on average 4.0) internal successors, (32), 8 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:27:57,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 19:27:57,374 INFO L93 Difference]: Finished difference Result 669 states and 1943 transitions. [2021-02-19 19:27:57,378 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-02-19 19:27:57,378 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.0) internal successors, (32), 8 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 24 [2021-02-19 19:27:57,378 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 19:27:57,381 INFO L225 Difference]: With dead ends: 669 [2021-02-19 19:27:57,381 INFO L226 Difference]: Without dead ends: 663 [2021-02-19 19:27:57,382 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=62, Invalid=94, Unknown=0, NotChecked=0, Total=156 [2021-02-19 19:27:57,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 663 states. [2021-02-19 19:27:57,394 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 663 to 413. [2021-02-19 19:27:57,395 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 413 states, 412 states have (on average 3.1699029126213594) internal successors, (1306), 412 states have internal predecessors, (1306), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:27:57,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 413 states to 413 states and 1306 transitions. [2021-02-19 19:27:57,396 INFO L78 Accepts]: Start accepts. Automaton has 413 states and 1306 transitions. Word has length 24 [2021-02-19 19:27:57,397 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 19:27:57,397 INFO L480 AbstractCegarLoop]: Abstraction has 413 states and 1306 transitions. [2021-02-19 19:27:57,397 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 4.0) internal successors, (32), 8 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:27:57,397 INFO L276 IsEmpty]: Start isEmpty. Operand 413 states and 1306 transitions. [2021-02-19 19:27:57,399 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-02-19 19:27:57,399 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 19:27:57,399 INFO L506 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 19:27:57,614 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-02-19 19:27:57,614 INFO L428 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 19:27:57,614 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 19:27:57,614 INFO L82 PathProgramCache]: Analyzing trace with hash -1652640880, now seen corresponding path program 8 times [2021-02-19 19:27:57,614 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 19:27:57,614 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2065665030] [2021-02-19 19:27:57,614 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 19:27:57,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:27:57,655 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:27:57,656 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2065665030] [2021-02-19 19:27:57,656 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1712459188] [2021-02-19 19:27:57,656 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 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 19:27:57,684 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-02-19 19:27:57,684 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 19:27:57,685 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 7 conjunts are in the unsatisfiable core [2021-02-19 19:27:57,685 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 19:27:57,786 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:27:57,786 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 19:27:57,786 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2021-02-19 19:27:57,786 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [741561481] [2021-02-19 19:27:57,786 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-02-19 19:27:57,786 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 19:27:57,787 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-02-19 19:27:57,787 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=119, Unknown=0, NotChecked=0, Total=156 [2021-02-19 19:27:57,787 INFO L87 Difference]: Start difference. First operand 413 states and 1306 transitions. Second operand has 13 states, 13 states have (on average 3.076923076923077) internal successors, (40), 12 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:27:57,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 19:27:57,949 INFO L93 Difference]: Finished difference Result 710 states and 2124 transitions. [2021-02-19 19:27:57,950 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-02-19 19:27:57,950 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 3.076923076923077) internal successors, (40), 12 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 24 [2021-02-19 19:27:57,950 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 19:27:57,953 INFO L225 Difference]: With dead ends: 710 [2021-02-19 19:27:57,953 INFO L226 Difference]: Without dead ends: 672 [2021-02-19 19:27:57,954 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=126, Invalid=336, Unknown=0, NotChecked=0, Total=462 [2021-02-19 19:27:57,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 672 states. [2021-02-19 19:27:57,967 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 672 to 515. [2021-02-19 19:27:57,968 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 515 states, 514 states have (on average 3.17704280155642) internal successors, (1633), 514 states have internal predecessors, (1633), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:27:57,970 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 515 states to 515 states and 1633 transitions. [2021-02-19 19:27:57,970 INFO L78 Accepts]: Start accepts. Automaton has 515 states and 1633 transitions. Word has length 24 [2021-02-19 19:27:57,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 19:27:57,970 INFO L480 AbstractCegarLoop]: Abstraction has 515 states and 1633 transitions. [2021-02-19 19:27:57,970 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 3.076923076923077) internal successors, (40), 12 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:27:57,970 INFO L276 IsEmpty]: Start isEmpty. Operand 515 states and 1633 transitions. [2021-02-19 19:27:57,972 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-02-19 19:27:57,972 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 19:27:57,972 INFO L506 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 19:27:58,186 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-02-19 19:27:58,186 INFO L428 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 19:27:58,187 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 19:27:58,187 INFO L82 PathProgramCache]: Analyzing trace with hash 1936369084, now seen corresponding path program 2 times [2021-02-19 19:27:58,187 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 19:27:58,187 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1522501012] [2021-02-19 19:27:58,187 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 19:27:58,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:27:58,214 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-02-19 19:27:58,214 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1522501012] [2021-02-19 19:27:58,215 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1930548328] [2021-02-19 19:27:58,215 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 19:27:58,241 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-02-19 19:27:58,242 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 19:27:58,242 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 5 conjunts are in the unsatisfiable core [2021-02-19 19:27:58,243 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 19:27:58,301 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-02-19 19:27:58,301 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 19:27:58,301 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 8 [2021-02-19 19:27:58,301 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1488173799] [2021-02-19 19:27:58,301 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-02-19 19:27:58,301 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 19:27:58,302 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-02-19 19:27:58,302 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-02-19 19:27:58,302 INFO L87 Difference]: Start difference. First operand 515 states and 1633 transitions. Second operand has 8 states, 8 states have (on average 4.0) internal successors, (32), 8 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:27:58,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 19:27:58,394 INFO L93 Difference]: Finished difference Result 830 states and 2453 transitions. [2021-02-19 19:27:58,394 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-02-19 19:27:58,394 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.0) internal successors, (32), 8 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 24 [2021-02-19 19:27:58,394 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 19:27:58,398 INFO L225 Difference]: With dead ends: 830 [2021-02-19 19:27:58,398 INFO L226 Difference]: Without dead ends: 830 [2021-02-19 19:27:58,398 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 21 SyntacticMatches, 2 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=62, Invalid=94, Unknown=0, NotChecked=0, Total=156 [2021-02-19 19:27:58,400 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 830 states. [2021-02-19 19:27:58,413 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 830 to 530. [2021-02-19 19:27:58,414 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 530 states, 529 states have (on average 3.153119092627599) internal successors, (1668), 529 states have internal predecessors, (1668), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:27:58,416 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 530 states to 530 states and 1668 transitions. [2021-02-19 19:27:58,416 INFO L78 Accepts]: Start accepts. Automaton has 530 states and 1668 transitions. Word has length 24 [2021-02-19 19:27:58,416 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 19:27:58,416 INFO L480 AbstractCegarLoop]: Abstraction has 530 states and 1668 transitions. [2021-02-19 19:27:58,416 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 4.0) internal successors, (32), 8 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:27:58,416 INFO L276 IsEmpty]: Start isEmpty. Operand 530 states and 1668 transitions. [2021-02-19 19:27:58,418 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-02-19 19:27:58,418 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 19:27:58,418 INFO L506 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 19:27:58,640 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-02-19 19:27:58,640 INFO L428 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 19:27:58,640 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 19:27:58,641 INFO L82 PathProgramCache]: Analyzing trace with hash 589687518, now seen corresponding path program 9 times [2021-02-19 19:27:58,641 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 19:27:58,641 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [715796387] [2021-02-19 19:27:58,641 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 19:27:58,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:27:58,685 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:27:58,685 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [715796387] [2021-02-19 19:27:58,685 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1899230505] [2021-02-19 19:27:58,685 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 19:27:58,706 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-02-19 19:27:58,706 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 19:27:58,707 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 7 conjunts are in the unsatisfiable core [2021-02-19 19:27:58,710 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 19:27:58,801 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:27:58,801 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 19:27:58,801 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 11 [2021-02-19 19:27:58,802 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [890377626] [2021-02-19 19:27:58,803 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-02-19 19:27:58,803 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 19:27:58,804 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-02-19 19:27:58,804 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2021-02-19 19:27:58,804 INFO L87 Difference]: Start difference. First operand 530 states and 1668 transitions. Second operand has 11 states, 11 states have (on average 2.909090909090909) internal successors, (32), 11 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:27:59,102 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 19:27:59,102 INFO L93 Difference]: Finished difference Result 1196 states and 3492 transitions. [2021-02-19 19:27:59,103 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-02-19 19:27:59,103 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.909090909090909) internal successors, (32), 11 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 24 [2021-02-19 19:27:59,103 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 19:27:59,108 INFO L225 Difference]: With dead ends: 1196 [2021-02-19 19:27:59,108 INFO L226 Difference]: Without dead ends: 1196 [2021-02-19 19:27:59,109 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 21 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=159, Invalid=441, Unknown=0, NotChecked=0, Total=600 [2021-02-19 19:27:59,111 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1196 states. [2021-02-19 19:27:59,127 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1196 to 542. [2021-02-19 19:27:59,128 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 542 states, 541 states have (on average 3.1497227356746764) internal successors, (1704), 541 states have internal predecessors, (1704), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:27:59,130 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 542 states to 542 states and 1704 transitions. [2021-02-19 19:27:59,130 INFO L78 Accepts]: Start accepts. Automaton has 542 states and 1704 transitions. Word has length 24 [2021-02-19 19:27:59,130 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 19:27:59,130 INFO L480 AbstractCegarLoop]: Abstraction has 542 states and 1704 transitions. [2021-02-19 19:27:59,130 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.909090909090909) internal successors, (32), 11 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:27:59,130 INFO L276 IsEmpty]: Start isEmpty. Operand 542 states and 1704 transitions. [2021-02-19 19:27:59,131 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-02-19 19:27:59,132 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 19:27:59,132 INFO L506 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 19:27:59,354 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-02-19 19:27:59,354 INFO L428 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 19:27:59,355 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 19:27:59,355 INFO L82 PathProgramCache]: Analyzing trace with hash 1374601612, now seen corresponding path program 10 times [2021-02-19 19:27:59,355 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 19:27:59,355 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [991345929] [2021-02-19 19:27:59,355 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 19:27:59,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:27:59,409 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:27:59,410 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [991345929] [2021-02-19 19:27:59,410 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1467399319] [2021-02-19 19:27:59,410 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 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-02-19 19:27:59,455 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-02-19 19:27:59,455 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 19:27:59,455 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 7 conjunts are in the unsatisfiable core [2021-02-19 19:27:59,461 INFO L286 TraceCheckSpWp]: Computing forward predicates... Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 19:27:59,541 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:27:59,542 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 19:27:59,542 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 11 [2021-02-19 19:27:59,542 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [863256571] [2021-02-19 19:27:59,542 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-02-19 19:27:59,543 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 19:27:59,543 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-02-19 19:27:59,543 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2021-02-19 19:27:59,543 INFO L87 Difference]: Start difference. First operand 542 states and 1704 transitions. Second operand has 11 states, 11 states have (on average 2.909090909090909) internal successors, (32), 11 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:27:59,953 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 19:27:59,954 INFO L93 Difference]: Finished difference Result 1492 states and 4245 transitions. [2021-02-19 19:27:59,954 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-02-19 19:27:59,954 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.909090909090909) internal successors, (32), 11 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 24 [2021-02-19 19:27:59,954 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 19:27:59,961 INFO L225 Difference]: With dead ends: 1492 [2021-02-19 19:27:59,961 INFO L226 Difference]: Without dead ends: 1492 [2021-02-19 19:27:59,962 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 21 SyntacticMatches, 1 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 354 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=292, Invalid=968, Unknown=0, NotChecked=0, Total=1260 [2021-02-19 19:27:59,964 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1492 states. [2021-02-19 19:27:59,981 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1492 to 586. [2021-02-19 19:27:59,982 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 586 states, 585 states have (on average 3.1555555555555554) internal successors, (1846), 585 states have internal predecessors, (1846), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:27:59,984 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 586 states to 586 states and 1846 transitions. [2021-02-19 19:27:59,984 INFO L78 Accepts]: Start accepts. Automaton has 586 states and 1846 transitions. Word has length 24 [2021-02-19 19:27:59,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 19:27:59,985 INFO L480 AbstractCegarLoop]: Abstraction has 586 states and 1846 transitions. [2021-02-19 19:27:59,985 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.909090909090909) internal successors, (32), 11 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:27:59,985 INFO L276 IsEmpty]: Start isEmpty. Operand 586 states and 1846 transitions. [2021-02-19 19:27:59,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-02-19 19:27:59,986 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 19:27:59,987 INFO L506 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 19:28:00,206 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 19:28:00,206 INFO L428 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 19:28:00,206 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 19:28:00,207 INFO L82 PathProgramCache]: Analyzing trace with hash 291578956, now seen corresponding path program 11 times [2021-02-19 19:28:00,207 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 19:28:00,207 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [686745964] [2021-02-19 19:28:00,207 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 19:28:00,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:28:00,266 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:28:00,266 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [686745964] [2021-02-19 19:28:00,266 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [798874859] [2021-02-19 19:28:00,266 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 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 19:28:00,292 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-02-19 19:28:00,293 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 19:28:00,293 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 7 conjunts are in the unsatisfiable core [2021-02-19 19:28:00,295 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 19:28:00,380 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:28:00,381 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 19:28:00,381 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2021-02-19 19:28:00,381 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [739548305] [2021-02-19 19:28:00,382 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-02-19 19:28:00,382 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 19:28:00,383 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-02-19 19:28:00,383 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=117, Unknown=0, NotChecked=0, Total=156 [2021-02-19 19:28:00,383 INFO L87 Difference]: Start difference. First operand 586 states and 1846 transitions. Second operand has 13 states, 13 states have (on average 3.076923076923077) internal successors, (40), 12 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:28:00,641 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 19:28:00,642 INFO L93 Difference]: Finished difference Result 1258 states and 3765 transitions. [2021-02-19 19:28:00,642 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-02-19 19:28:00,642 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 3.076923076923077) internal successors, (40), 12 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 24 [2021-02-19 19:28:00,642 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 19:28:00,647 INFO L225 Difference]: With dead ends: 1258 [2021-02-19 19:28:00,647 INFO L226 Difference]: Without dead ends: 1248 [2021-02-19 19:28:00,647 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 115 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=169, Invalid=431, Unknown=0, NotChecked=0, Total=600 [2021-02-19 19:28:00,650 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1248 states. [2021-02-19 19:28:00,665 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1248 to 758. [2021-02-19 19:28:00,667 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 758 states, 757 states have (on average 3.224570673712021) internal successors, (2441), 757 states have internal predecessors, (2441), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:28:00,669 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 758 states to 758 states and 2441 transitions. [2021-02-19 19:28:00,669 INFO L78 Accepts]: Start accepts. Automaton has 758 states and 2441 transitions. Word has length 24 [2021-02-19 19:28:00,669 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 19:28:00,669 INFO L480 AbstractCegarLoop]: Abstraction has 758 states and 2441 transitions. [2021-02-19 19:28:00,669 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 3.076923076923077) internal successors, (40), 12 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:28:00,670 INFO L276 IsEmpty]: Start isEmpty. Operand 758 states and 2441 transitions. [2021-02-19 19:28:00,671 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-02-19 19:28:00,671 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 19:28:00,672 INFO L506 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 19:28:00,886 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable19 [2021-02-19 19:28:00,886 INFO L428 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 19:28:00,886 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 19:28:00,886 INFO L82 PathProgramCache]: Analyzing trace with hash 1762657074, now seen corresponding path program 12 times [2021-02-19 19:28:00,886 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 19:28:00,886 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1930477213] [2021-02-19 19:28:00,887 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 19:28:00,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:28:00,927 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:28:00,928 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1930477213] [2021-02-19 19:28:00,928 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [907823131] [2021-02-19 19:28:00,928 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 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 19:28:00,951 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-02-19 19:28:00,952 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 19:28:00,952 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 7 conjunts are in the unsatisfiable core [2021-02-19 19:28:00,953 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 19:28:01,034 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:28:01,035 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 19:28:01,035 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2021-02-19 19:28:01,035 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [413454977] [2021-02-19 19:28:01,036 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-02-19 19:28:01,036 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 19:28:01,036 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-02-19 19:28:01,036 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=117, Unknown=0, NotChecked=0, Total=156 [2021-02-19 19:28:01,036 INFO L87 Difference]: Start difference. First operand 758 states and 2441 transitions. Second operand has 13 states, 13 states have (on average 2.8461538461538463) internal successors, (37), 12 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) [2021-02-19 19:28:01,333 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 19:28:01,333 INFO L93 Difference]: Finished difference Result 1329 states and 4025 transitions. [2021-02-19 19:28:01,333 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-02-19 19:28:01,334 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.8461538461538463) internal successors, (37), 12 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 24 [2021-02-19 19:28:01,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 19:28:01,340 INFO L225 Difference]: With dead ends: 1329 [2021-02-19 19:28:01,340 INFO L226 Difference]: Without dead ends: 1329 [2021-02-19 19:28:01,340 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 148 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=211, Invalid=491, Unknown=0, NotChecked=0, Total=702 [2021-02-19 19:28:01,342 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1329 states. [2021-02-19 19:28:01,358 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1329 to 764. [2021-02-19 19:28:01,359 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 764 states, 763 states have (on average 3.220183486238532) internal successors, (2457), 763 states have internal predecessors, (2457), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:28:01,362 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 764 states to 764 states and 2457 transitions. [2021-02-19 19:28:01,362 INFO L78 Accepts]: Start accepts. Automaton has 764 states and 2457 transitions. Word has length 24 [2021-02-19 19:28:01,362 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 19:28:01,362 INFO L480 AbstractCegarLoop]: Abstraction has 764 states and 2457 transitions. [2021-02-19 19:28:01,362 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.8461538461538463) internal successors, (37), 12 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) [2021-02-19 19:28:01,363 INFO L276 IsEmpty]: Start isEmpty. Operand 764 states and 2457 transitions. [2021-02-19 19:28:01,365 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-02-19 19:28:01,365 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 19:28:01,365 INFO L506 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 19:28:01,578 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 19:28:01,578 INFO L428 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 19:28:01,578 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 19:28:01,578 INFO L82 PathProgramCache]: Analyzing trace with hash 1329780470, now seen corresponding path program 13 times [2021-02-19 19:28:01,578 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 19:28:01,578 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1290333917] [2021-02-19 19:28:01,578 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 19:28:01,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:28:01,613 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:28:01,614 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1290333917] [2021-02-19 19:28:01,614 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1334142045] [2021-02-19 19:28:01,614 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 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 19:28:01,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:28:01,636 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 7 conjunts are in the unsatisfiable core [2021-02-19 19:28:01,636 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 19:28:01,695 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:28:01,695 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 19:28:01,695 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 11 [2021-02-19 19:28:01,695 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [52078406] [2021-02-19 19:28:01,696 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-02-19 19:28:01,696 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 19:28:01,696 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-02-19 19:28:01,696 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2021-02-19 19:28:01,696 INFO L87 Difference]: Start difference. First operand 764 states and 2457 transitions. Second operand has 11 states, 11 states have (on average 2.909090909090909) internal successors, (32), 11 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:28:02,078 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 19:28:02,078 INFO L93 Difference]: Finished difference Result 1548 states and 4638 transitions. [2021-02-19 19:28:02,078 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-02-19 19:28:02,079 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.909090909090909) internal successors, (32), 11 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 24 [2021-02-19 19:28:02,079 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 19:28:02,086 INFO L225 Difference]: With dead ends: 1548 [2021-02-19 19:28:02,087 INFO L226 Difference]: Without dead ends: 1544 [2021-02-19 19:28:02,087 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 223 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=235, Invalid=695, Unknown=0, NotChecked=0, Total=930 [2021-02-19 19:28:02,091 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1544 states. [2021-02-19 19:28:02,110 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1544 to 772. [2021-02-19 19:28:02,112 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 772 states, 771 states have (on average 3.204928664072633) internal successors, (2471), 771 states have internal predecessors, (2471), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:28:02,114 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 772 states to 772 states and 2471 transitions. [2021-02-19 19:28:02,114 INFO L78 Accepts]: Start accepts. Automaton has 772 states and 2471 transitions. Word has length 24 [2021-02-19 19:28:02,115 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 19:28:02,115 INFO L480 AbstractCegarLoop]: Abstraction has 772 states and 2471 transitions. [2021-02-19 19:28:02,115 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.909090909090909) internal successors, (32), 11 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:28:02,115 INFO L276 IsEmpty]: Start isEmpty. Operand 772 states and 2471 transitions. [2021-02-19 19:28:02,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-02-19 19:28:02,118 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 19:28:02,118 INFO L506 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 19:28:02,340 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-02-19 19:28:02,341 INFO L428 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 19:28:02,341 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 19:28:02,341 INFO L82 PathProgramCache]: Analyzing trace with hash 1057771280, now seen corresponding path program 14 times [2021-02-19 19:28:02,342 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 19:28:02,342 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2041037611] [2021-02-19 19:28:02,342 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 19:28:02,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:28:02,387 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:28:02,387 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2041037611] [2021-02-19 19:28:02,387 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [509141077] [2021-02-19 19:28:02,387 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 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 19:28:02,410 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-02-19 19:28:02,410 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 19:28:02,410 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 7 conjunts are in the unsatisfiable core [2021-02-19 19:28:02,411 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 19:28:02,499 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:28:02,499 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 19:28:02,499 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 13 [2021-02-19 19:28:02,499 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [33992200] [2021-02-19 19:28:02,499 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-02-19 19:28:02,500 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 19:28:02,500 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-02-19 19:28:02,500 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=117, Unknown=0, NotChecked=0, Total=156 [2021-02-19 19:28:02,500 INFO L87 Difference]: Start difference. First operand 772 states and 2471 transitions. Second operand has 13 states, 13 states have (on average 3.0) internal successors, (39), 13 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) [2021-02-19 19:28:03,241 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 19:28:03,241 INFO L93 Difference]: Finished difference Result 2734 states and 8136 transitions. [2021-02-19 19:28:03,241 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-02-19 19:28:03,242 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 3.0) internal successors, (39), 13 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 24 [2021-02-19 19:28:03,242 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 19:28:03,253 INFO L225 Difference]: With dead ends: 2734 [2021-02-19 19:28:03,253 INFO L226 Difference]: Without dead ends: 2734 [2021-02-19 19:28:03,254 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 876 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=584, Invalid=1966, Unknown=0, NotChecked=0, Total=2550 [2021-02-19 19:28:03,258 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2734 states. [2021-02-19 19:28:03,286 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2734 to 841. [2021-02-19 19:28:03,287 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 841 states, 840 states have (on average 3.3107142857142855) internal successors, (2781), 840 states have internal predecessors, (2781), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:28:03,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 841 states to 841 states and 2781 transitions. [2021-02-19 19:28:03,290 INFO L78 Accepts]: Start accepts. Automaton has 841 states and 2781 transitions. Word has length 24 [2021-02-19 19:28:03,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 19:28:03,290 INFO L480 AbstractCegarLoop]: Abstraction has 841 states and 2781 transitions. [2021-02-19 19:28:03,290 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 3.0) internal successors, (39), 13 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) [2021-02-19 19:28:03,290 INFO L276 IsEmpty]: Start isEmpty. Operand 841 states and 2781 transitions. [2021-02-19 19:28:03,293 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-02-19 19:28:03,293 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 19:28:03,293 INFO L506 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 19:28:03,506 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 19:28:03,506 INFO L428 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 19:28:03,506 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 19:28:03,506 INFO L82 PathProgramCache]: Analyzing trace with hash 1624723360, now seen corresponding path program 15 times [2021-02-19 19:28:03,506 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 19:28:03,506 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1276580411] [2021-02-19 19:28:03,506 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 19:28:03,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:28:03,557 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:28:03,557 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1276580411] [2021-02-19 19:28:03,557 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [958993763] [2021-02-19 19:28:03,558 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 [2021-02-19 19:28:03,579 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-02-19 19:28:03,580 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 19:28:03,580 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 7 conjunts are in the unsatisfiable core [2021-02-19 19:28:03,587 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 19:28:03,672 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:28:03,672 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 19:28:03,672 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 13 [2021-02-19 19:28:03,672 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [440671859] [2021-02-19 19:28:03,673 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-02-19 19:28:03,673 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 19:28:03,673 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-02-19 19:28:03,673 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=117, Unknown=0, NotChecked=0, Total=156 [2021-02-19 19:28:03,673 INFO L87 Difference]: Start difference. First operand 841 states and 2781 transitions. Second operand has 13 states, 13 states have (on average 3.0) internal successors, (39), 13 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) [2021-02-19 19:28:04,380 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 19:28:04,381 INFO L93 Difference]: Finished difference Result 2693 states and 8043 transitions. [2021-02-19 19:28:04,381 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-02-19 19:28:04,381 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 3.0) internal successors, (39), 13 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 24 [2021-02-19 19:28:04,381 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 19:28:04,389 INFO L225 Difference]: With dead ends: 2693 [2021-02-19 19:28:04,389 INFO L226 Difference]: Without dead ends: 2693 [2021-02-19 19:28:04,390 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 881 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=584, Invalid=1966, Unknown=0, NotChecked=0, Total=2550 [2021-02-19 19:28:04,394 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2693 states. [2021-02-19 19:28:04,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2693 to 831. [2021-02-19 19:28:04,420 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 831 states, 830 states have (on average 3.289156626506024) internal successors, (2730), 830 states have internal predecessors, (2730), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:28:04,423 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 831 states to 831 states and 2730 transitions. [2021-02-19 19:28:04,423 INFO L78 Accepts]: Start accepts. Automaton has 831 states and 2730 transitions. Word has length 24 [2021-02-19 19:28:04,423 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 19:28:04,423 INFO L480 AbstractCegarLoop]: Abstraction has 831 states and 2730 transitions. [2021-02-19 19:28:04,423 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 3.0) internal successors, (39), 13 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) [2021-02-19 19:28:04,423 INFO L276 IsEmpty]: Start isEmpty. Operand 831 states and 2730 transitions. [2021-02-19 19:28:04,425 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-02-19 19:28:04,426 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 19:28:04,426 INFO L506 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 19:28:04,648 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-02-19 19:28:04,649 INFO L428 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 19:28:04,649 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 19:28:04,649 INFO L82 PathProgramCache]: Analyzing trace with hash 452377502, now seen corresponding path program 16 times [2021-02-19 19:28:04,649 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 19:28:04,649 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [87320993] [2021-02-19 19:28:04,649 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 19:28:04,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:28:04,692 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:28:04,693 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [87320993] [2021-02-19 19:28:04,693 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [252317339] [2021-02-19 19:28:04,693 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 [2021-02-19 19:28:04,711 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-02-19 19:28:04,711 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 19:28:04,712 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 7 conjunts are in the unsatisfiable core [2021-02-19 19:28:04,712 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 19:28:04,788 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:28:04,788 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 19:28:04,789 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 12 [2021-02-19 19:28:04,789 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [22900579] [2021-02-19 19:28:04,789 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-02-19 19:28:04,789 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 19:28:04,789 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-02-19 19:28:04,789 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2021-02-19 19:28:04,790 INFO L87 Difference]: Start difference. First operand 831 states and 2730 transitions. Second operand has 12 states, 12 states have (on average 2.8333333333333335) internal successors, (34), 12 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) [2021-02-19 19:28:05,489 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 19:28:05,489 INFO L93 Difference]: Finished difference Result 2677 states and 7780 transitions. [2021-02-19 19:28:05,490 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-02-19 19:28:05,490 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.8333333333333335) internal successors, (34), 12 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 24 [2021-02-19 19:28:05,490 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 19:28:05,495 INFO L225 Difference]: With dead ends: 2677 [2021-02-19 19:28:05,495 INFO L226 Difference]: Without dead ends: 2677 [2021-02-19 19:28:05,496 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 733 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=493, Invalid=1669, Unknown=0, NotChecked=0, Total=2162 [2021-02-19 19:28:05,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2677 states. [2021-02-19 19:28:05,523 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2677 to 845. [2021-02-19 19:28:05,525 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 845 states, 844 states have (on average 3.2997630331753554) internal successors, (2785), 844 states have internal predecessors, (2785), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:28:05,527 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 845 states to 845 states and 2785 transitions. [2021-02-19 19:28:05,528 INFO L78 Accepts]: Start accepts. Automaton has 845 states and 2785 transitions. Word has length 24 [2021-02-19 19:28:05,528 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 19:28:05,528 INFO L480 AbstractCegarLoop]: Abstraction has 845 states and 2785 transitions. [2021-02-19 19:28:05,528 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.8333333333333335) internal successors, (34), 12 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) [2021-02-19 19:28:05,528 INFO L276 IsEmpty]: Start isEmpty. Operand 845 states and 2785 transitions. [2021-02-19 19:28:05,531 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-02-19 19:28:05,531 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 19:28:05,531 INFO L506 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 19:28:05,746 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-02-19 19:28:05,746 INFO L428 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 19:28:05,746 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 19:28:05,746 INFO L82 PathProgramCache]: Analyzing trace with hash 533753590, now seen corresponding path program 17 times [2021-02-19 19:28:05,746 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 19:28:05,747 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1673779640] [2021-02-19 19:28:05,747 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 19:28:05,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:28:05,788 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:28:05,788 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1673779640] [2021-02-19 19:28:05,788 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1764805711] [2021-02-19 19:28:05,788 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 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 19:28:05,812 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-02-19 19:28:05,812 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 19:28:05,813 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 7 conjunts are in the unsatisfiable core [2021-02-19 19:28:05,813 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 19:28:05,885 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:28:05,886 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 19:28:05,886 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 12 [2021-02-19 19:28:05,886 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1049322653] [2021-02-19 19:28:05,886 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-02-19 19:28:05,886 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 19:28:05,887 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-02-19 19:28:05,887 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2021-02-19 19:28:05,887 INFO L87 Difference]: Start difference. First operand 845 states and 2785 transitions. Second operand has 12 states, 12 states have (on average 2.8333333333333335) internal successors, (34), 12 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) [2021-02-19 19:28:06,413 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 19:28:06,413 INFO L93 Difference]: Finished difference Result 2474 states and 7308 transitions. [2021-02-19 19:28:06,414 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-02-19 19:28:06,414 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.8333333333333335) internal successors, (34), 12 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 24 [2021-02-19 19:28:06,414 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 19:28:06,419 INFO L225 Difference]: With dead ends: 2474 [2021-02-19 19:28:06,419 INFO L226 Difference]: Without dead ends: 2470 [2021-02-19 19:28:06,420 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 616 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=448, Invalid=1444, Unknown=0, NotChecked=0, Total=1892 [2021-02-19 19:28:06,423 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2470 states. [2021-02-19 19:28:06,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2470 to 845. [2021-02-19 19:28:06,448 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 845 states, 844 states have (on average 3.2973933649289098) internal successors, (2783), 844 states have internal predecessors, (2783), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:28:06,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 845 states to 845 states and 2783 transitions. [2021-02-19 19:28:06,451 INFO L78 Accepts]: Start accepts. Automaton has 845 states and 2783 transitions. Word has length 24 [2021-02-19 19:28:06,451 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 19:28:06,451 INFO L480 AbstractCegarLoop]: Abstraction has 845 states and 2783 transitions. [2021-02-19 19:28:06,451 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.8333333333333335) internal successors, (34), 12 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) [2021-02-19 19:28:06,451 INFO L276 IsEmpty]: Start isEmpty. Operand 845 states and 2783 transitions. [2021-02-19 19:28:06,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-02-19 19:28:06,454 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 19:28:06,454 INFO L506 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 19:28:06,675 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-02-19 19:28:06,675 INFO L428 AbstractCegarLoop]: === Iteration 23 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 19:28:06,676 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 19:28:06,676 INFO L82 PathProgramCache]: Analyzing trace with hash 1464410806, now seen corresponding path program 18 times [2021-02-19 19:28:06,676 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 19:28:06,676 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1569107704] [2021-02-19 19:28:06,676 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 19:28:06,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:28:06,713 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:28:06,713 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1569107704] [2021-02-19 19:28:06,713 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [431324873] [2021-02-19 19:28:06,713 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 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 19:28:06,735 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-02-19 19:28:06,735 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 19:28:06,735 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 7 conjunts are in the unsatisfiable core [2021-02-19 19:28:06,736 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 19:28:06,809 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:28:06,810 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 19:28:06,810 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 13 [2021-02-19 19:28:06,810 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1055793489] [2021-02-19 19:28:06,810 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-02-19 19:28:06,810 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 19:28:06,810 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-02-19 19:28:06,810 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=116, Unknown=0, NotChecked=0, Total=156 [2021-02-19 19:28:06,811 INFO L87 Difference]: Start difference. First operand 845 states and 2783 transitions. Second operand has 13 states, 13 states have (on average 2.6923076923076925) internal successors, (35), 13 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:28:07,431 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 19:28:07,432 INFO L93 Difference]: Finished difference Result 2514 states and 7408 transitions. [2021-02-19 19:28:07,432 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-02-19 19:28:07,432 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.6923076923076925) internal successors, (35), 13 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-02-19 19:28:07,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 19:28:07,439 INFO L225 Difference]: With dead ends: 2514 [2021-02-19 19:28:07,439 INFO L226 Difference]: Without dead ends: 2514 [2021-02-19 19:28:07,439 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 679 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=480, Invalid=1590, Unknown=0, NotChecked=0, Total=2070 [2021-02-19 19:28:07,443 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2514 states. [2021-02-19 19:28:07,464 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2514 to 853. [2021-02-19 19:28:07,466 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 853 states, 852 states have (on average 3.3039906103286385) internal successors, (2815), 852 states have internal predecessors, (2815), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:28:07,469 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 853 states to 853 states and 2815 transitions. [2021-02-19 19:28:07,469 INFO L78 Accepts]: Start accepts. Automaton has 853 states and 2815 transitions. Word has length 24 [2021-02-19 19:28:07,469 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 19:28:07,469 INFO L480 AbstractCegarLoop]: Abstraction has 853 states and 2815 transitions. [2021-02-19 19:28:07,469 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.6923076923076925) internal successors, (35), 13 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:28:07,469 INFO L276 IsEmpty]: Start isEmpty. Operand 853 states and 2815 transitions. [2021-02-19 19:28:07,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-02-19 19:28:07,471 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 19:28:07,471 INFO L506 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 19:28:07,690 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-02-19 19:28:07,690 INFO L428 AbstractCegarLoop]: === Iteration 24 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 19:28:07,690 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 19:28:07,690 INFO L82 PathProgramCache]: Analyzing trace with hash -1187517336, now seen corresponding path program 19 times [2021-02-19 19:28:07,690 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 19:28:07,691 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [659535188] [2021-02-19 19:28:07,691 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 19:28:07,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:28:07,736 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:28:07,736 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [659535188] [2021-02-19 19:28:07,736 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1009395813] [2021-02-19 19:28:07,736 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 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-02-19 19:28:07,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:28:07,760 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 7 conjunts are in the unsatisfiable core [2021-02-19 19:28:07,761 INFO L286 TraceCheckSpWp]: Computing forward predicates... Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 19:28:07,844 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:28:07,844 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 19:28:07,844 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 13 [2021-02-19 19:28:07,844 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [499846921] [2021-02-19 19:28:07,844 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-02-19 19:28:07,845 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 19:28:07,845 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-02-19 19:28:07,845 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=116, Unknown=0, NotChecked=0, Total=156 [2021-02-19 19:28:07,845 INFO L87 Difference]: Start difference. First operand 853 states and 2815 transitions. Second operand has 13 states, 13 states have (on average 2.6923076923076925) internal successors, (35), 13 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:28:08,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 19:28:08,394 INFO L93 Difference]: Finished difference Result 2332 states and 6984 transitions. [2021-02-19 19:28:08,394 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-02-19 19:28:08,395 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.6923076923076925) internal successors, (35), 13 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-02-19 19:28:08,395 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 19:28:08,400 INFO L225 Difference]: With dead ends: 2332 [2021-02-19 19:28:08,400 INFO L226 Difference]: Without dead ends: 2328 [2021-02-19 19:28:08,400 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 605 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=460, Invalid=1432, Unknown=0, NotChecked=0, Total=1892 [2021-02-19 19:28:08,403 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2328 states. [2021-02-19 19:28:08,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2328 to 853. [2021-02-19 19:28:08,426 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 853 states, 852 states have (on average 3.301643192488263) internal successors, (2813), 852 states have internal predecessors, (2813), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:28:08,429 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 853 states to 853 states and 2813 transitions. [2021-02-19 19:28:08,429 INFO L78 Accepts]: Start accepts. Automaton has 853 states and 2813 transitions. Word has length 24 [2021-02-19 19:28:08,429 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 19:28:08,429 INFO L480 AbstractCegarLoop]: Abstraction has 853 states and 2813 transitions. [2021-02-19 19:28:08,429 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.6923076923076925) internal successors, (35), 13 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:28:08,429 INFO L276 IsEmpty]: Start isEmpty. Operand 853 states and 2813 transitions. [2021-02-19 19:28:08,432 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-02-19 19:28:08,432 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 19:28:08,432 INFO L506 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 19:28:08,653 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-02-19 19:28:08,654 INFO L428 AbstractCegarLoop]: === Iteration 25 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 19:28:08,654 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 19:28:08,654 INFO L82 PathProgramCache]: Analyzing trace with hash -2099802888, now seen corresponding path program 3 times [2021-02-19 19:28:08,654 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 19:28:08,654 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1082178084] [2021-02-19 19:28:08,654 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 19:28:08,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:28:08,682 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-02-19 19:28:08,682 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1082178084] [2021-02-19 19:28:08,683 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1533545378] [2021-02-19 19:28:08,683 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 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-02-19 19:28:08,707 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-02-19 19:28:08,707 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 19:28:08,708 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 5 conjunts are in the unsatisfiable core [2021-02-19 19:28:08,708 INFO L286 TraceCheckSpWp]: Computing forward predicates... Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 19:28:08,758 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-02-19 19:28:08,758 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 19:28:08,758 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 8 [2021-02-19 19:28:08,758 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [693960350] [2021-02-19 19:28:08,758 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-02-19 19:28:08,758 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 19:28:08,759 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-02-19 19:28:08,759 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-02-19 19:28:08,759 INFO L87 Difference]: Start difference. First operand 853 states and 2813 transitions. Second operand has 8 states, 8 states have (on average 4.0) internal successors, (32), 8 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:28:08,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 19:28:08,831 INFO L93 Difference]: Finished difference Result 929 states and 3034 transitions. [2021-02-19 19:28:08,831 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-02-19 19:28:08,831 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.0) internal successors, (32), 8 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 24 [2021-02-19 19:28:08,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 19:28:08,835 INFO L225 Difference]: With dead ends: 929 [2021-02-19 19:28:08,835 INFO L226 Difference]: Without dead ends: 929 [2021-02-19 19:28:08,836 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 21 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=48, Invalid=84, Unknown=0, NotChecked=0, Total=132 [2021-02-19 19:28:08,837 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 929 states. [2021-02-19 19:28:08,854 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 929 to 780. [2021-02-19 19:28:08,862 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 780 states, 779 states have (on average 3.3029525032092426) internal successors, (2573), 779 states have internal predecessors, (2573), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:28:08,865 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 780 states to 780 states and 2573 transitions. [2021-02-19 19:28:08,865 INFO L78 Accepts]: Start accepts. Automaton has 780 states and 2573 transitions. Word has length 24 [2021-02-19 19:28:08,865 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 19:28:08,865 INFO L480 AbstractCegarLoop]: Abstraction has 780 states and 2573 transitions. [2021-02-19 19:28:08,865 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 4.0) internal successors, (32), 8 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:28:08,865 INFO L276 IsEmpty]: Start isEmpty. Operand 780 states and 2573 transitions. [2021-02-19 19:28:08,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-02-19 19:28:08,873 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 19:28:08,873 INFO L506 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 19:28:09,094 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 19:28:09,094 INFO L428 AbstractCegarLoop]: === Iteration 26 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 19:28:09,095 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 19:28:09,095 INFO L82 PathProgramCache]: Analyzing trace with hash -1169603144, now seen corresponding path program 20 times [2021-02-19 19:28:09,095 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 19:28:09,095 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1669914535] [2021-02-19 19:28:09,095 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 19:28:09,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:28:09,128 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:28:09,129 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1669914535] [2021-02-19 19:28:09,129 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1381624498] [2021-02-19 19:28:09,129 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 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 [2021-02-19 19:28:09,160 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-02-19 19:28:09,160 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 19:28:09,160 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 7 conjunts are in the unsatisfiable core [2021-02-19 19:28:09,161 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 19:28:09,211 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:28:09,211 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 19:28:09,211 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 10 [2021-02-19 19:28:09,211 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [412831739] [2021-02-19 19:28:09,211 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-02-19 19:28:09,212 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 19:28:09,212 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-02-19 19:28:09,212 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2021-02-19 19:28:09,212 INFO L87 Difference]: Start difference. First operand 780 states and 2573 transitions. Second operand has 10 states, 10 states have (on average 3.1) internal successors, (31), 10 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) [2021-02-19 19:28:09,493 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 19:28:09,494 INFO L93 Difference]: Finished difference Result 1555 states and 4761 transitions. [2021-02-19 19:28:09,494 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-02-19 19:28:09,494 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.1) internal successors, (31), 10 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 24 [2021-02-19 19:28:09,494 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 19:28:09,499 INFO L225 Difference]: With dead ends: 1555 [2021-02-19 19:28:09,499 INFO L226 Difference]: Without dead ends: 1555 [2021-02-19 19:28:09,500 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 172 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=186, Invalid=516, Unknown=0, NotChecked=0, Total=702 [2021-02-19 19:28:09,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1555 states. [2021-02-19 19:28:09,516 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1555 to 842. [2021-02-19 19:28:09,517 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 842 states, 841 states have (on average 3.296076099881094) internal successors, (2772), 841 states have internal predecessors, (2772), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:28:09,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 842 states to 842 states and 2772 transitions. [2021-02-19 19:28:09,520 INFO L78 Accepts]: Start accepts. Automaton has 842 states and 2772 transitions. Word has length 24 [2021-02-19 19:28:09,520 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 19:28:09,520 INFO L480 AbstractCegarLoop]: Abstraction has 842 states and 2772 transitions. [2021-02-19 19:28:09,520 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.1) internal successors, (31), 10 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) [2021-02-19 19:28:09,520 INFO L276 IsEmpty]: Start isEmpty. Operand 842 states and 2772 transitions. [2021-02-19 19:28:09,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-02-19 19:28:09,523 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 19:28:09,523 INFO L506 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 19:28:09,738 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,24 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 19:28:09,738 INFO L428 AbstractCegarLoop]: === Iteration 27 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 19:28:09,738 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 19:28:09,738 INFO L82 PathProgramCache]: Analyzing trace with hash 733076308, now seen corresponding path program 21 times [2021-02-19 19:28:09,738 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 19:28:09,739 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1236286894] [2021-02-19 19:28:09,739 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 19:28:09,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:28:09,791 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:28:09,791 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1236286894] [2021-02-19 19:28:09,791 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1838541413] [2021-02-19 19:28:09,791 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 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 [2021-02-19 19:28:09,810 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-02-19 19:28:09,810 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 19:28:09,811 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 7 conjunts are in the unsatisfiable core [2021-02-19 19:28:09,811 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 19:28:09,862 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:28:09,862 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 19:28:09,862 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2021-02-19 19:28:09,863 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1156079210] [2021-02-19 19:28:09,863 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-02-19 19:28:09,863 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 19:28:09,863 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-02-19 19:28:09,863 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2021-02-19 19:28:09,864 INFO L87 Difference]: Start difference. First operand 842 states and 2772 transitions. Second operand has 9 states, 9 states have (on average 3.4444444444444446) internal successors, (31), 9 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) [2021-02-19 19:28:10,108 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 19:28:10,108 INFO L93 Difference]: Finished difference Result 1605 states and 4891 transitions. [2021-02-19 19:28:10,109 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-02-19 19:28:10,109 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.4444444444444446) internal successors, (31), 9 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 24 [2021-02-19 19:28:10,109 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 19:28:10,113 INFO L225 Difference]: With dead ends: 1605 [2021-02-19 19:28:10,113 INFO L226 Difference]: Without dead ends: 1605 [2021-02-19 19:28:10,114 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 146 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=165, Invalid=435, Unknown=0, NotChecked=0, Total=600 [2021-02-19 19:28:10,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1605 states. [2021-02-19 19:28:10,130 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1605 to 896. [2021-02-19 19:28:10,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 896 states, 895 states have (on average 3.2905027932960893) internal successors, (2945), 895 states have internal predecessors, (2945), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:28:10,134 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 896 states to 896 states and 2945 transitions. [2021-02-19 19:28:10,134 INFO L78 Accepts]: Start accepts. Automaton has 896 states and 2945 transitions. Word has length 24 [2021-02-19 19:28:10,134 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 19:28:10,134 INFO L480 AbstractCegarLoop]: Abstraction has 896 states and 2945 transitions. [2021-02-19 19:28:10,134 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 3.4444444444444446) internal successors, (31), 9 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) [2021-02-19 19:28:10,134 INFO L276 IsEmpty]: Start isEmpty. Operand 896 states and 2945 transitions. [2021-02-19 19:28:10,136 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-02-19 19:28:10,136 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 19:28:10,136 INFO L506 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 19:28:10,350 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 19:28:10,350 INFO L428 AbstractCegarLoop]: === Iteration 28 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 19:28:10,350 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 19:28:10,350 INFO L82 PathProgramCache]: Analyzing trace with hash 688255166, now seen corresponding path program 22 times [2021-02-19 19:28:10,351 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 19:28:10,351 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1064115519] [2021-02-19 19:28:10,351 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 19:28:10,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:28:10,387 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-02-19 19:28:10,387 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1064115519] [2021-02-19 19:28:10,387 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1739362172] [2021-02-19 19:28:10,387 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 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 [2021-02-19 19:28:10,408 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-02-19 19:28:10,408 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 19:28:10,408 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 7 conjunts are in the unsatisfiable core [2021-02-19 19:28:10,408 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 19:28:10,454 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-02-19 19:28:10,454 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 19:28:10,454 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2021-02-19 19:28:10,455 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [352852592] [2021-02-19 19:28:10,455 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-02-19 19:28:10,455 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 19:28:10,455 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-02-19 19:28:10,455 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2021-02-19 19:28:10,455 INFO L87 Difference]: Start difference. First operand 896 states and 2945 transitions. Second operand has 9 states, 9 states have (on average 3.4444444444444446) internal successors, (31), 9 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) [2021-02-19 19:28:10,639 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 19:28:10,639 INFO L93 Difference]: Finished difference Result 1524 states and 4690 transitions. [2021-02-19 19:28:10,639 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-02-19 19:28:10,639 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.4444444444444446) internal successors, (31), 9 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 24 [2021-02-19 19:28:10,639 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 19:28:10,645 INFO L225 Difference]: With dead ends: 1524 [2021-02-19 19:28:10,645 INFO L226 Difference]: Without dead ends: 1520 [2021-02-19 19:28:10,646 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=113, Invalid=307, Unknown=0, NotChecked=0, Total=420 [2021-02-19 19:28:10,648 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1520 states. [2021-02-19 19:28:10,662 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1520 to 896. [2021-02-19 19:28:10,664 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 896 states, 895 states have (on average 3.288268156424581) internal successors, (2943), 895 states have internal predecessors, (2943), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:28:10,667 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 896 states to 896 states and 2943 transitions. [2021-02-19 19:28:10,667 INFO L78 Accepts]: Start accepts. Automaton has 896 states and 2943 transitions. Word has length 24 [2021-02-19 19:28:10,667 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 19:28:10,667 INFO L480 AbstractCegarLoop]: Abstraction has 896 states and 2943 transitions. [2021-02-19 19:28:10,668 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 3.4444444444444446) internal successors, (31), 9 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) [2021-02-19 19:28:10,668 INFO L276 IsEmpty]: Start isEmpty. Operand 896 states and 2943 transitions. [2021-02-19 19:28:10,669 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-02-19 19:28:10,669 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 19:28:10,670 INFO L506 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 19:28:10,882 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable31 [2021-02-19 19:28:10,882 INFO L428 AbstractCegarLoop]: === Iteration 29 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 19:28:10,882 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 19:28:10,882 INFO L82 PathProgramCache]: Analyzing trace with hash 1285591824, now seen corresponding path program 23 times [2021-02-19 19:28:10,882 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 19:28:10,882 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [234279003] [2021-02-19 19:28:10,882 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 19:28:10,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:28:10,937 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:28:10,937 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [234279003] [2021-02-19 19:28:10,937 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [815151922] [2021-02-19 19:28:10,937 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 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 [2021-02-19 19:28:10,969 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-02-19 19:28:10,969 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 19:28:10,969 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 7 conjunts are in the unsatisfiable core [2021-02-19 19:28:10,970 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 19:28:11,011 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:28:11,012 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 19:28:11,012 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 10 [2021-02-19 19:28:11,012 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [226968414] [2021-02-19 19:28:11,012 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-02-19 19:28:11,012 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 19:28:11,012 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-02-19 19:28:11,013 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2021-02-19 19:28:11,013 INFO L87 Difference]: Start difference. First operand 896 states and 2943 transitions. Second operand has 10 states, 10 states have (on average 3.1) internal successors, (31), 10 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) [2021-02-19 19:28:11,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 19:28:11,223 INFO L93 Difference]: Finished difference Result 1508 states and 4652 transitions. [2021-02-19 19:28:11,223 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-02-19 19:28:11,223 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.1) internal successors, (31), 10 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 24 [2021-02-19 19:28:11,223 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 19:28:11,226 INFO L225 Difference]: With dead ends: 1508 [2021-02-19 19:28:11,226 INFO L226 Difference]: Without dead ends: 1496 [2021-02-19 19:28:11,227 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 117 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=141, Invalid=411, Unknown=0, NotChecked=0, Total=552 [2021-02-19 19:28:11,228 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1496 states. [2021-02-19 19:28:11,239 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1496 to 904. [2021-02-19 19:28:11,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 904 states, 903 states have (on average 3.276854928017719) internal successors, (2959), 903 states have internal predecessors, (2959), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:28:11,242 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 904 states to 904 states and 2959 transitions. [2021-02-19 19:28:11,242 INFO L78 Accepts]: Start accepts. Automaton has 904 states and 2959 transitions. Word has length 24 [2021-02-19 19:28:11,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 19:28:11,242 INFO L480 AbstractCegarLoop]: Abstraction has 904 states and 2959 transitions. [2021-02-19 19:28:11,242 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.1) internal successors, (31), 10 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) [2021-02-19 19:28:11,242 INFO L276 IsEmpty]: Start isEmpty. Operand 904 states and 2959 transitions. [2021-02-19 19:28:11,244 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-02-19 19:28:11,244 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 19:28:11,244 INFO L506 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 19:28:11,444 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,27 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 19:28:11,444 INFO L428 AbstractCegarLoop]: === Iteration 30 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 19:28:11,444 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 19:28:11,444 INFO L82 PathProgramCache]: Analyzing trace with hash 759171540, now seen corresponding path program 24 times [2021-02-19 19:28:11,445 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 19:28:11,445 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2053460024] [2021-02-19 19:28:11,445 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 19:28:11,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:28:11,482 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:28:11,482 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2053460024] [2021-02-19 19:28:11,483 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1782120646] [2021-02-19 19:28:11,483 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 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 [2021-02-19 19:28:11,516 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-02-19 19:28:11,516 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 19:28:11,516 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 7 conjunts are in the unsatisfiable core [2021-02-19 19:28:11,517 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 19:28:11,610 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:28:11,610 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 19:28:11,610 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 13 [2021-02-19 19:28:11,611 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [580719250] [2021-02-19 19:28:11,611 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-02-19 19:28:11,611 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 19:28:11,611 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-02-19 19:28:11,611 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=115, Unknown=0, NotChecked=0, Total=156 [2021-02-19 19:28:11,612 INFO L87 Difference]: Start difference. First operand 904 states and 2959 transitions. Second operand has 13 states, 13 states have (on average 3.0) internal successors, (39), 13 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) [2021-02-19 19:28:12,107 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 19:28:12,108 INFO L93 Difference]: Finished difference Result 2412 states and 7565 transitions. [2021-02-19 19:28:12,108 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-02-19 19:28:12,108 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 3.0) internal successors, (39), 13 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 24 [2021-02-19 19:28:12,108 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 19:28:12,113 INFO L225 Difference]: With dead ends: 2412 [2021-02-19 19:28:12,113 INFO L226 Difference]: Without dead ends: 2412 [2021-02-19 19:28:12,114 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 437 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=358, Invalid=1124, Unknown=0, NotChecked=0, Total=1482 [2021-02-19 19:28:12,118 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2412 states. [2021-02-19 19:28:12,137 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2412 to 960. [2021-02-19 19:28:12,138 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 960 states, 959 states have (on average 3.367049009384776) internal successors, (3229), 959 states have internal predecessors, (3229), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:28:12,141 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 960 states to 960 states and 3229 transitions. [2021-02-19 19:28:12,141 INFO L78 Accepts]: Start accepts. Automaton has 960 states and 3229 transitions. Word has length 24 [2021-02-19 19:28:12,141 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 19:28:12,141 INFO L480 AbstractCegarLoop]: Abstraction has 960 states and 3229 transitions. [2021-02-19 19:28:12,141 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 3.0) internal successors, (39), 13 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) [2021-02-19 19:28:12,141 INFO L276 IsEmpty]: Start isEmpty. Operand 960 states and 3229 transitions. [2021-02-19 19:28:12,144 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-02-19 19:28:12,144 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 19:28:12,144 INFO L506 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 19:28:12,358 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2021-02-19 19:28:12,358 INFO L428 AbstractCegarLoop]: === Iteration 31 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 19:28:12,358 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 19:28:12,358 INFO L82 PathProgramCache]: Analyzing trace with hash 1326123620, now seen corresponding path program 25 times [2021-02-19 19:28:12,358 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 19:28:12,358 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [347561720] [2021-02-19 19:28:12,358 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 19:28:12,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:28:12,392 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:28:12,392 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [347561720] [2021-02-19 19:28:12,392 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [634801238] [2021-02-19 19:28:12,392 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 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 [2021-02-19 19:28:12,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:28:12,411 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 7 conjunts are in the unsatisfiable core [2021-02-19 19:28:12,411 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 19:28:12,520 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:28:12,520 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 19:28:12,521 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 13 [2021-02-19 19:28:12,521 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [359089722] [2021-02-19 19:28:12,521 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-02-19 19:28:12,521 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 19:28:12,521 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-02-19 19:28:12,521 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=115, Unknown=0, NotChecked=0, Total=156 [2021-02-19 19:28:12,521 INFO L87 Difference]: Start difference. First operand 960 states and 3229 transitions. Second operand has 13 states, 13 states have (on average 3.0) internal successors, (39), 13 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) [2021-02-19 19:28:12,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 19:28:12,963 INFO L93 Difference]: Finished difference Result 2335 states and 7372 transitions. [2021-02-19 19:28:12,963 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-02-19 19:28:12,963 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 3.0) internal successors, (39), 13 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 24 [2021-02-19 19:28:12,963 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 19:28:12,968 INFO L225 Difference]: With dead ends: 2335 [2021-02-19 19:28:12,968 INFO L226 Difference]: Without dead ends: 2335 [2021-02-19 19:28:12,968 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 441 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=358, Invalid=1124, Unknown=0, NotChecked=0, Total=1482 [2021-02-19 19:28:12,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2335 states. [2021-02-19 19:28:12,990 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2335 to 957. [2021-02-19 19:28:12,992 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 957 states, 956 states have (on average 3.3629707112970713) internal successors, (3215), 956 states have internal predecessors, (3215), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:28:12,995 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 957 states to 957 states and 3215 transitions. [2021-02-19 19:28:12,995 INFO L78 Accepts]: Start accepts. Automaton has 957 states and 3215 transitions. Word has length 24 [2021-02-19 19:28:12,995 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 19:28:12,995 INFO L480 AbstractCegarLoop]: Abstraction has 957 states and 3215 transitions. [2021-02-19 19:28:12,995 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 3.0) internal successors, (39), 13 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) [2021-02-19 19:28:12,995 INFO L276 IsEmpty]: Start isEmpty. Operand 957 states and 3215 transitions. [2021-02-19 19:28:12,997 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-02-19 19:28:12,997 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 19:28:12,997 INFO L506 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 19:28:13,214 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34,29 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 19:28:13,214 INFO L428 AbstractCegarLoop]: === Iteration 32 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 19:28:13,214 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 19:28:13,214 INFO L82 PathProgramCache]: Analyzing trace with hash 153777762, now seen corresponding path program 26 times [2021-02-19 19:28:13,214 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 19:28:13,214 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1042463150] [2021-02-19 19:28:13,214 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 19:28:13,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:28:13,271 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:28:13,271 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1042463150] [2021-02-19 19:28:13,271 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [667143553] [2021-02-19 19:28:13,271 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 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-02-19 19:28:13,296 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-02-19 19:28:13,296 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 19:28:13,297 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 7 conjunts are in the unsatisfiable core [2021-02-19 19:28:13,297 INFO L286 TraceCheckSpWp]: Computing forward predicates... Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 19:28:13,373 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:28:13,373 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 19:28:13,373 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 12 [2021-02-19 19:28:13,373 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1176475172] [2021-02-19 19:28:13,373 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-02-19 19:28:13,373 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 19:28:13,374 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-02-19 19:28:13,374 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=94, Unknown=0, NotChecked=0, Total=132 [2021-02-19 19:28:13,374 INFO L87 Difference]: Start difference. First operand 957 states and 3215 transitions. Second operand has 12 states, 12 states have (on average 2.8333333333333335) internal successors, (34), 12 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) [2021-02-19 19:28:13,766 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 19:28:13,767 INFO L93 Difference]: Finished difference Result 2285 states and 7121 transitions. [2021-02-19 19:28:13,767 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-02-19 19:28:13,768 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.8333333333333335) internal successors, (34), 12 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 24 [2021-02-19 19:28:13,768 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 19:28:13,770 INFO L225 Difference]: With dead ends: 2285 [2021-02-19 19:28:13,771 INFO L226 Difference]: Without dead ends: 2285 [2021-02-19 19:28:13,771 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 334 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=292, Invalid=898, Unknown=0, NotChecked=0, Total=1190 [2021-02-19 19:28:13,773 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2285 states. [2021-02-19 19:28:13,785 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2285 to 963. [2021-02-19 19:28:13,786 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 963 states, 962 states have (on average 3.367983367983368) internal successors, (3240), 962 states have internal predecessors, (3240), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:28:13,788 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 963 states to 963 states and 3240 transitions. [2021-02-19 19:28:13,788 INFO L78 Accepts]: Start accepts. Automaton has 963 states and 3240 transitions. Word has length 24 [2021-02-19 19:28:13,789 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 19:28:13,789 INFO L480 AbstractCegarLoop]: Abstraction has 963 states and 3240 transitions. [2021-02-19 19:28:13,789 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.8333333333333335) internal successors, (34), 12 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) [2021-02-19 19:28:13,789 INFO L276 IsEmpty]: Start isEmpty. Operand 963 states and 3240 transitions. [2021-02-19 19:28:13,791 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-02-19 19:28:13,791 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 19:28:13,791 INFO L506 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 19:28:13,999 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2021-02-19 19:28:13,999 INFO L428 AbstractCegarLoop]: === Iteration 33 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 19:28:14,000 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 19:28:14,000 INFO L82 PathProgramCache]: Analyzing trace with hash 235153850, now seen corresponding path program 27 times [2021-02-19 19:28:14,000 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 19:28:14,000 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1466035340] [2021-02-19 19:28:14,000 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 19:28:14,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:28:14,047 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:28:14,047 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1466035340] [2021-02-19 19:28:14,047 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [568490749] [2021-02-19 19:28:14,048 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 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 [2021-02-19 19:28:14,087 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-02-19 19:28:14,087 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 19:28:14,087 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 7 conjunts are in the unsatisfiable core [2021-02-19 19:28:14,088 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 19:28:14,150 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:28:14,150 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 19:28:14,151 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 12 [2021-02-19 19:28:14,151 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1098380281] [2021-02-19 19:28:14,151 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-02-19 19:28:14,151 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 19:28:14,151 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-02-19 19:28:14,151 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=94, Unknown=0, NotChecked=0, Total=132 [2021-02-19 19:28:14,152 INFO L87 Difference]: Start difference. First operand 963 states and 3240 transitions. Second operand has 12 states, 12 states have (on average 2.8333333333333335) internal successors, (34), 12 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) [2021-02-19 19:28:14,533 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 19:28:14,534 INFO L93 Difference]: Finished difference Result 2176 states and 6849 transitions. [2021-02-19 19:28:14,534 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-02-19 19:28:14,534 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.8333333333333335) internal successors, (34), 12 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 24 [2021-02-19 19:28:14,534 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 19:28:14,537 INFO L225 Difference]: With dead ends: 2176 [2021-02-19 19:28:14,537 INFO L226 Difference]: Without dead ends: 2172 [2021-02-19 19:28:14,538 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 235 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=235, Invalid=695, Unknown=0, NotChecked=0, Total=930 [2021-02-19 19:28:14,540 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2172 states. [2021-02-19 19:28:14,553 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2172 to 957. [2021-02-19 19:28:14,554 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 957 states, 956 states have (on average 3.3629707112970713) internal successors, (3215), 956 states have internal predecessors, (3215), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:28:14,556 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 957 states to 957 states and 3215 transitions. [2021-02-19 19:28:14,556 INFO L78 Accepts]: Start accepts. Automaton has 957 states and 3215 transitions. Word has length 24 [2021-02-19 19:28:14,556 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 19:28:14,556 INFO L480 AbstractCegarLoop]: Abstraction has 957 states and 3215 transitions. [2021-02-19 19:28:14,556 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.8333333333333335) internal successors, (34), 12 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) [2021-02-19 19:28:14,556 INFO L276 IsEmpty]: Start isEmpty. Operand 957 states and 3215 transitions. [2021-02-19 19:28:14,558 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-02-19 19:28:14,558 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 19:28:14,558 INFO L506 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 19:28:14,761 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36,31 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 19:28:14,761 INFO L428 AbstractCegarLoop]: === Iteration 34 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 19:28:14,761 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 19:28:14,762 INFO L82 PathProgramCache]: Analyzing trace with hash 1165811066, now seen corresponding path program 28 times [2021-02-19 19:28:14,762 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 19:28:14,762 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [633135479] [2021-02-19 19:28:14,762 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 19:28:14,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:28:14,801 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:28:14,801 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [633135479] [2021-02-19 19:28:14,801 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1729484439] [2021-02-19 19:28:14,801 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 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 [2021-02-19 19:28:14,834 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-02-19 19:28:14,834 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 19:28:14,835 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 7 conjunts are in the unsatisfiable core [2021-02-19 19:28:14,836 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 19:28:14,925 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:28:14,925 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 19:28:14,925 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 13 [2021-02-19 19:28:14,925 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1603606661] [2021-02-19 19:28:14,926 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-02-19 19:28:14,926 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 19:28:14,926 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-02-19 19:28:14,926 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=114, Unknown=0, NotChecked=0, Total=156 [2021-02-19 19:28:14,927 INFO L87 Difference]: Start difference. First operand 957 states and 3215 transitions. Second operand has 13 states, 13 states have (on average 2.6923076923076925) internal successors, (35), 13 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:28:15,269 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 19:28:15,270 INFO L93 Difference]: Finished difference Result 2199 states and 6893 transitions. [2021-02-19 19:28:15,270 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-02-19 19:28:15,270 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.6923076923076925) internal successors, (35), 13 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-02-19 19:28:15,270 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 19:28:15,273 INFO L225 Difference]: With dead ends: 2199 [2021-02-19 19:28:15,273 INFO L226 Difference]: Without dead ends: 2199 [2021-02-19 19:28:15,274 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 281 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=257, Invalid=799, Unknown=0, NotChecked=0, Total=1056 [2021-02-19 19:28:15,276 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2199 states. [2021-02-19 19:28:15,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2199 to 963. [2021-02-19 19:28:15,290 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 963 states, 962 states have (on average 3.367983367983368) internal successors, (3240), 962 states have internal predecessors, (3240), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:28:15,292 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 963 states to 963 states and 3240 transitions. [2021-02-19 19:28:15,292 INFO L78 Accepts]: Start accepts. Automaton has 963 states and 3240 transitions. Word has length 24 [2021-02-19 19:28:15,292 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 19:28:15,292 INFO L480 AbstractCegarLoop]: Abstraction has 963 states and 3240 transitions. [2021-02-19 19:28:15,292 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.6923076923076925) internal successors, (35), 13 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:28:15,292 INFO L276 IsEmpty]: Start isEmpty. Operand 963 states and 3240 transitions. [2021-02-19 19:28:15,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-02-19 19:28:15,295 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 19:28:15,295 INFO L506 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 19:28:15,502 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2021-02-19 19:28:15,502 INFO L428 AbstractCegarLoop]: === Iteration 35 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 19:28:15,502 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 19:28:15,502 INFO L82 PathProgramCache]: Analyzing trace with hash -1486117076, now seen corresponding path program 29 times [2021-02-19 19:28:15,503 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 19:28:15,503 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [825894114] [2021-02-19 19:28:15,503 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 19:28:15,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:28:15,544 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:28:15,545 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [825894114] [2021-02-19 19:28:15,545 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [969783108] [2021-02-19 19:28:15,545 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 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 [2021-02-19 19:28:15,595 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-02-19 19:28:15,595 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 19:28:15,595 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 7 conjunts are in the unsatisfiable core [2021-02-19 19:28:15,596 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 19:28:15,698 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:28:15,698 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 19:28:15,698 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 13 [2021-02-19 19:28:15,698 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [690014379] [2021-02-19 19:28:15,699 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-02-19 19:28:15,699 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 19:28:15,699 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-02-19 19:28:15,699 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=114, Unknown=0, NotChecked=0, Total=156 [2021-02-19 19:28:15,699 INFO L87 Difference]: Start difference. First operand 963 states and 3240 transitions. Second operand has 13 states, 13 states have (on average 2.6923076923076925) internal successors, (35), 13 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:28:16,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 19:28:16,099 INFO L93 Difference]: Finished difference Result 2156 states and 6791 transitions. [2021-02-19 19:28:16,099 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-02-19 19:28:16,099 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.6923076923076925) internal successors, (35), 13 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-02-19 19:28:16,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 19:28:16,102 INFO L225 Difference]: With dead ends: 2156 [2021-02-19 19:28:16,102 INFO L226 Difference]: Without dead ends: 2152 [2021-02-19 19:28:16,103 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 218 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=226, Invalid=644, Unknown=0, NotChecked=0, Total=870 [2021-02-19 19:28:16,105 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2152 states. [2021-02-19 19:28:16,121 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2152 to 957. [2021-02-19 19:28:16,123 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 957 states, 956 states have (on average 3.3629707112970713) internal successors, (3215), 956 states have internal predecessors, (3215), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:28:16,125 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 957 states to 957 states and 3215 transitions. [2021-02-19 19:28:16,125 INFO L78 Accepts]: Start accepts. Automaton has 957 states and 3215 transitions. Word has length 24 [2021-02-19 19:28:16,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 19:28:16,125 INFO L480 AbstractCegarLoop]: Abstraction has 957 states and 3215 transitions. [2021-02-19 19:28:16,126 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.6923076923076925) internal successors, (35), 13 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:28:16,126 INFO L276 IsEmpty]: Start isEmpty. Operand 957 states and 3215 transitions. [2021-02-19 19:28:16,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-02-19 19:28:16,128 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 19:28:16,128 INFO L506 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 19:28:16,342 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-02-19 19:28:16,342 INFO L428 AbstractCegarLoop]: === Iteration 36 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 19:28:16,342 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 19:28:16,342 INFO L82 PathProgramCache]: Analyzing trace with hash -482689092, now seen corresponding path program 30 times [2021-02-19 19:28:16,342 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 19:28:16,342 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [528156529] [2021-02-19 19:28:16,342 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 19:28:16,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:28:16,376 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:28:16,376 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [528156529] [2021-02-19 19:28:16,377 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1327846514] [2021-02-19 19:28:16,377 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 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 [2021-02-19 19:28:16,399 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-02-19 19:28:16,399 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 19:28:16,400 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 7 conjunts are in the unsatisfiable core [2021-02-19 19:28:16,400 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 19:28:16,458 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:28:16,458 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 19:28:16,458 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 11 [2021-02-19 19:28:16,458 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [110075063] [2021-02-19 19:28:16,458 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-02-19 19:28:16,458 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 19:28:16,459 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-02-19 19:28:16,459 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2021-02-19 19:28:16,459 INFO L87 Difference]: Start difference. First operand 957 states and 3215 transitions. Second operand has 11 states, 11 states have (on average 3.0) internal successors, (33), 11 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) [2021-02-19 19:28:16,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 19:28:16,830 INFO L93 Difference]: Finished difference Result 2097 states and 6377 transitions. [2021-02-19 19:28:16,831 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-02-19 19:28:16,831 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 3.0) internal successors, (33), 11 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 24 [2021-02-19 19:28:16,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 19:28:16,833 INFO L225 Difference]: With dead ends: 2097 [2021-02-19 19:28:16,834 INFO L226 Difference]: Without dead ends: 2097 [2021-02-19 19:28:16,834 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 21 SyntacticMatches, 1 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 309 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=273, Invalid=783, Unknown=0, NotChecked=0, Total=1056 [2021-02-19 19:28:16,836 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2097 states. [2021-02-19 19:28:16,848 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2097 to 1047. [2021-02-19 19:28:16,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1047 states, 1046 states have (on average 3.378585086042065) internal successors, (3534), 1046 states have internal predecessors, (3534), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:28:16,851 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1047 states to 1047 states and 3534 transitions. [2021-02-19 19:28:16,851 INFO L78 Accepts]: Start accepts. Automaton has 1047 states and 3534 transitions. Word has length 24 [2021-02-19 19:28:16,852 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 19:28:16,852 INFO L480 AbstractCegarLoop]: Abstraction has 1047 states and 3534 transitions. [2021-02-19 19:28:16,852 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 3.0) internal successors, (33), 11 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) [2021-02-19 19:28:16,852 INFO L276 IsEmpty]: Start isEmpty. Operand 1047 states and 3534 transitions. [2021-02-19 19:28:16,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-02-19 19:28:16,854 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 19:28:16,854 INFO L506 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 19:28:17,054 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2021-02-19 19:28:17,054 INFO L428 AbstractCegarLoop]: === Iteration 37 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 19:28:17,054 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 19:28:17,054 INFO L82 PathProgramCache]: Analyzing trace with hash -401313004, now seen corresponding path program 31 times [2021-02-19 19:28:17,055 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 19:28:17,055 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1891908359] [2021-02-19 19:28:17,055 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 19:28:17,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:28:17,091 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:28:17,091 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1891908359] [2021-02-19 19:28:17,091 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1682334141] [2021-02-19 19:28:17,091 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 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 [2021-02-19 19:28:17,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:28:17,110 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 7 conjunts are in the unsatisfiable core [2021-02-19 19:28:17,111 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 19:28:17,169 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:28:17,169 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 19:28:17,170 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 11 [2021-02-19 19:28:17,170 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1016710121] [2021-02-19 19:28:17,170 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-02-19 19:28:17,170 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 19:28:17,170 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-02-19 19:28:17,170 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2021-02-19 19:28:17,170 INFO L87 Difference]: Start difference. First operand 1047 states and 3534 transitions. Second operand has 11 states, 11 states have (on average 3.0) internal successors, (33), 11 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) [2021-02-19 19:28:17,448 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 19:28:17,448 INFO L93 Difference]: Finished difference Result 1963 states and 6051 transitions. [2021-02-19 19:28:17,448 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-02-19 19:28:17,448 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 3.0) internal successors, (33), 11 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 24 [2021-02-19 19:28:17,448 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 19:28:17,451 INFO L225 Difference]: With dead ends: 1963 [2021-02-19 19:28:17,451 INFO L226 Difference]: Without dead ends: 1959 [2021-02-19 19:28:17,451 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 191 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=193, Invalid=563, Unknown=0, NotChecked=0, Total=756 [2021-02-19 19:28:17,453 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1959 states. [2021-02-19 19:28:17,470 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1959 to 1047. [2021-02-19 19:28:17,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1047 states, 1046 states have (on average 3.376673040152964) internal successors, (3532), 1046 states have internal predecessors, (3532), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:28:17,474 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1047 states to 1047 states and 3532 transitions. [2021-02-19 19:28:17,474 INFO L78 Accepts]: Start accepts. Automaton has 1047 states and 3532 transitions. Word has length 24 [2021-02-19 19:28:17,474 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 19:28:17,474 INFO L480 AbstractCegarLoop]: Abstraction has 1047 states and 3532 transitions. [2021-02-19 19:28:17,474 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 3.0) internal successors, (33), 11 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) [2021-02-19 19:28:17,474 INFO L276 IsEmpty]: Start isEmpty. Operand 1047 states and 3532 transitions. [2021-02-19 19:28:17,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-02-19 19:28:17,476 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 19:28:17,477 INFO L506 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 19:28:17,697 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable40 [2021-02-19 19:28:17,698 INFO L428 AbstractCegarLoop]: === Iteration 38 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 19:28:17,698 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 19:28:17,698 INFO L82 PathProgramCache]: Analyzing trace with hash -1916404976, now seen corresponding path program 32 times [2021-02-19 19:28:17,698 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 19:28:17,698 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [69177660] [2021-02-19 19:28:17,698 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 19:28:17,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:28:17,730 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:28:17,730 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [69177660] [2021-02-19 19:28:17,730 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1485749601] [2021-02-19 19:28:17,730 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 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 19:28:17,749 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-02-19 19:28:17,749 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 19:28:17,750 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 7 conjunts are in the unsatisfiable core [2021-02-19 19:28:17,750 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 19:28:17,802 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:28:17,803 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 19:28:17,803 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 11 [2021-02-19 19:28:17,803 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1606713900] [2021-02-19 19:28:17,803 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-02-19 19:28:17,803 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 19:28:17,804 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-02-19 19:28:17,804 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2021-02-19 19:28:17,804 INFO L87 Difference]: Start difference. First operand 1047 states and 3532 transitions. Second operand has 11 states, 11 states have (on average 3.0) internal successors, (33), 11 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) [2021-02-19 19:28:18,010 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 19:28:18,011 INFO L93 Difference]: Finished difference Result 1728 states and 5494 transitions. [2021-02-19 19:28:18,011 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-02-19 19:28:18,011 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 3.0) internal successors, (33), 11 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 24 [2021-02-19 19:28:18,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 19:28:18,013 INFO L225 Difference]: With dead ends: 1728 [2021-02-19 19:28:18,013 INFO L226 Difference]: Without dead ends: 1716 [2021-02-19 19:28:18,014 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 109 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=136, Invalid=370, Unknown=0, NotChecked=0, Total=506 [2021-02-19 19:28:18,015 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1716 states. [2021-02-19 19:28:18,025 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1716 to 1047. [2021-02-19 19:28:18,027 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1047 states, 1046 states have (on average 3.372848948374761) internal successors, (3528), 1046 states have internal predecessors, (3528), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:28:18,030 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1047 states to 1047 states and 3528 transitions. [2021-02-19 19:28:18,030 INFO L78 Accepts]: Start accepts. Automaton has 1047 states and 3528 transitions. Word has length 24 [2021-02-19 19:28:18,030 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 19:28:18,030 INFO L480 AbstractCegarLoop]: Abstraction has 1047 states and 3528 transitions. [2021-02-19 19:28:18,030 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 3.0) internal successors, (33), 11 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) [2021-02-19 19:28:18,030 INFO L276 IsEmpty]: Start isEmpty. Operand 1047 states and 3528 transitions. [2021-02-19 19:28:18,032 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-02-19 19:28:18,032 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 19:28:18,032 INFO L506 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 19:28:18,252 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,36 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 19:28:18,253 INFO L428 AbstractCegarLoop]: === Iteration 39 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 19:28:18,253 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 19:28:18,253 INFO L82 PathProgramCache]: Analyzing trace with hash -319278260, now seen corresponding path program 33 times [2021-02-19 19:28:18,253 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 19:28:18,253 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [971355569] [2021-02-19 19:28:18,253 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 19:28:18,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:28:18,288 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:28:18,288 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [971355569] [2021-02-19 19:28:18,288 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1925678577] [2021-02-19 19:28:18,288 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 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 [2021-02-19 19:28:18,313 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-02-19 19:28:18,313 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 19:28:18,313 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 7 conjunts are in the unsatisfiable core [2021-02-19 19:28:18,314 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 19:28:18,392 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:28:18,392 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 19:28:18,392 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 13 [2021-02-19 19:28:18,392 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [456200467] [2021-02-19 19:28:18,392 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-02-19 19:28:18,393 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 19:28:18,393 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-02-19 19:28:18,393 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=114, Unknown=0, NotChecked=0, Total=156 [2021-02-19 19:28:18,393 INFO L87 Difference]: Start difference. First operand 1047 states and 3528 transitions. Second operand has 13 states, 13 states have (on average 2.6923076923076925) internal successors, (35), 13 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:28:18,750 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 19:28:18,750 INFO L93 Difference]: Finished difference Result 1821 states and 5719 transitions. [2021-02-19 19:28:18,750 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-02-19 19:28:18,751 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.6923076923076925) internal successors, (35), 13 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-02-19 19:28:18,751 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 19:28:18,761 INFO L225 Difference]: With dead ends: 1821 [2021-02-19 19:28:18,761 INFO L226 Difference]: Without dead ends: 1821 [2021-02-19 19:28:18,762 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 225 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=202, Invalid=668, Unknown=0, NotChecked=0, Total=870 [2021-02-19 19:28:18,764 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1821 states. [2021-02-19 19:28:18,776 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1821 to 1119. [2021-02-19 19:28:18,777 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1119 states, 1118 states have (on average 3.370304114490161) internal successors, (3768), 1118 states have internal predecessors, (3768), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:28:18,779 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1119 states to 1119 states and 3768 transitions. [2021-02-19 19:28:18,779 INFO L78 Accepts]: Start accepts. Automaton has 1119 states and 3768 transitions. Word has length 24 [2021-02-19 19:28:18,779 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 19:28:18,779 INFO L480 AbstractCegarLoop]: Abstraction has 1119 states and 3768 transitions. [2021-02-19 19:28:18,779 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.6923076923076925) internal successors, (35), 13 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:28:18,779 INFO L276 IsEmpty]: Start isEmpty. Operand 1119 states and 3768 transitions. [2021-02-19 19:28:18,781 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-02-19 19:28:18,781 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 19:28:18,781 INFO L506 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 19:28:18,989 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable42 [2021-02-19 19:28:18,990 INFO L428 AbstractCegarLoop]: === Iteration 40 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 19:28:18,990 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 19:28:18,990 INFO L82 PathProgramCache]: Analyzing trace with hash 1323760894, now seen corresponding path program 34 times [2021-02-19 19:28:18,990 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 19:28:18,990 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [35152786] [2021-02-19 19:28:18,990 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 19:28:18,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:28:19,024 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:28:19,024 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [35152786] [2021-02-19 19:28:19,024 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1975023418] [2021-02-19 19:28:19,024 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 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 [2021-02-19 19:28:19,043 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-02-19 19:28:19,043 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 19:28:19,044 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 7 conjunts are in the unsatisfiable core [2021-02-19 19:28:19,044 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 19:28:19,112 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:28:19,112 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 19:28:19,112 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 13 [2021-02-19 19:28:19,113 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1555618671] [2021-02-19 19:28:19,113 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-02-19 19:28:19,113 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 19:28:19,113 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-02-19 19:28:19,113 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=114, Unknown=0, NotChecked=0, Total=156 [2021-02-19 19:28:19,113 INFO L87 Difference]: Start difference. First operand 1119 states and 3768 transitions. Second operand has 13 states, 13 states have (on average 2.6923076923076925) internal successors, (35), 13 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:28:19,380 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 19:28:19,380 INFO L93 Difference]: Finished difference Result 1790 states and 5648 transitions. [2021-02-19 19:28:19,380 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-02-19 19:28:19,380 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.6923076923076925) internal successors, (35), 13 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-02-19 19:28:19,380 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 19:28:19,382 INFO L225 Difference]: With dead ends: 1790 [2021-02-19 19:28:19,382 INFO L226 Difference]: Without dead ends: 1786 [2021-02-19 19:28:19,383 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 156 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=156, Invalid=494, Unknown=0, NotChecked=0, Total=650 [2021-02-19 19:28:19,384 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1786 states. [2021-02-19 19:28:19,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1786 to 1119. [2021-02-19 19:28:19,396 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1119 states, 1118 states have (on average 3.368515205724508) internal successors, (3766), 1118 states have internal predecessors, (3766), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:28:19,399 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1119 states to 1119 states and 3766 transitions. [2021-02-19 19:28:19,399 INFO L78 Accepts]: Start accepts. Automaton has 1119 states and 3766 transitions. Word has length 24 [2021-02-19 19:28:19,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 19:28:19,399 INFO L480 AbstractCegarLoop]: Abstraction has 1119 states and 3766 transitions. [2021-02-19 19:28:19,399 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.6923076923076925) internal successors, (35), 13 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:28:19,399 INFO L276 IsEmpty]: Start isEmpty. Operand 1119 states and 3766 transitions. [2021-02-19 19:28:19,401 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-02-19 19:28:19,401 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 19:28:19,402 INFO L506 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 19:28:19,618 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable43 [2021-02-19 19:28:19,618 INFO L428 AbstractCegarLoop]: === Iteration 41 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 19:28:19,618 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 19:28:19,618 INFO L82 PathProgramCache]: Analyzing trace with hash 56303716, now seen corresponding path program 35 times [2021-02-19 19:28:19,618 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 19:28:19,618 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1080200325] [2021-02-19 19:28:19,618 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 19:28:19,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:28:19,663 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:28:19,663 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1080200325] [2021-02-19 19:28:19,663 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1897595836] [2021-02-19 19:28:19,663 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 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 [2021-02-19 19:28:19,699 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-02-19 19:28:19,699 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 19:28:19,699 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 7 conjunts are in the unsatisfiable core [2021-02-19 19:28:19,700 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 19:28:19,764 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:28:19,765 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 19:28:19,765 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 12 [2021-02-19 19:28:19,765 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [694307999] [2021-02-19 19:28:19,765 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-02-19 19:28:19,765 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 19:28:19,765 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-02-19 19:28:19,766 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=94, Unknown=0, NotChecked=0, Total=132 [2021-02-19 19:28:19,766 INFO L87 Difference]: Start difference. First operand 1119 states and 3766 transitions. Second operand has 12 states, 12 states have (on average 2.8333333333333335) internal successors, (34), 12 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) [2021-02-19 19:28:19,945 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 19:28:19,945 INFO L93 Difference]: Finished difference Result 1649 states and 5332 transitions. [2021-02-19 19:28:19,946 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-02-19 19:28:19,946 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.8333333333333335) internal successors, (34), 12 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 24 [2021-02-19 19:28:19,946 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 19:28:19,948 INFO L225 Difference]: With dead ends: 1649 [2021-02-19 19:28:19,948 INFO L226 Difference]: Without dead ends: 1637 [2021-02-19 19:28:19,949 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 71 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=94, Invalid=248, Unknown=0, NotChecked=0, Total=342 [2021-02-19 19:28:19,950 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1637 states. [2021-02-19 19:28:19,961 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1637 to 1119. [2021-02-19 19:28:19,962 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1119 states, 1118 states have (on average 3.3649373881932023) internal successors, (3762), 1118 states have internal predecessors, (3762), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:28:19,964 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1119 states to 1119 states and 3762 transitions. [2021-02-19 19:28:19,965 INFO L78 Accepts]: Start accepts. Automaton has 1119 states and 3762 transitions. Word has length 24 [2021-02-19 19:28:19,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 19:28:19,965 INFO L480 AbstractCegarLoop]: Abstraction has 1119 states and 3762 transitions. [2021-02-19 19:28:19,965 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.8333333333333335) internal successors, (34), 12 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) [2021-02-19 19:28:19,965 INFO L276 IsEmpty]: Start isEmpty. Operand 1119 states and 3762 transitions. [2021-02-19 19:28:19,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-02-19 19:28:19,967 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 19:28:19,967 INFO L506 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 19:28:20,167 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44,39 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 19:28:20,167 INFO L428 AbstractCegarLoop]: === Iteration 42 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 19:28:20,167 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 19:28:20,167 INFO L82 PathProgramCache]: Analyzing trace with hash 60170290, now seen corresponding path program 4 times [2021-02-19 19:28:20,168 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 19:28:20,168 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1203260803] [2021-02-19 19:28:20,168 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 19:28:20,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:28:20,387 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:28:20,387 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1203260803] [2021-02-19 19:28:20,387 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1654487129] [2021-02-19 19:28:20,388 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 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 [2021-02-19 19:28:20,407 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-02-19 19:28:20,407 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 19:28:20,408 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 25 conjunts are in the unsatisfiable core [2021-02-19 19:28:20,408 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 19:28:20,570 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-02-19 19:28:20,571 INFO L173 IndexEqualityManager]: detected equality via solver [2021-02-19 19:28:20,572 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2021-02-19 19:28:20,574 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-02-19 19:28:20,578 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-02-19 19:28:20,580 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-02-19 19:28:20,580 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:3 [2021-02-19 19:28:20,599 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:28:20,599 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 19:28:20,600 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 18 [2021-02-19 19:28:20,600 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1889171962] [2021-02-19 19:28:20,600 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-02-19 19:28:20,600 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 19:28:20,600 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-02-19 19:28:20,600 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=256, Unknown=0, NotChecked=0, Total=306 [2021-02-19 19:28:20,600 INFO L87 Difference]: Start difference. First operand 1119 states and 3762 transitions. Second operand has 18 states, 18 states have (on average 2.5555555555555554) internal successors, (46), 18 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:28:21,554 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 19:28:21,554 INFO L93 Difference]: Finished difference Result 1650 states and 5371 transitions. [2021-02-19 19:28:21,555 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-02-19 19:28:21,555 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.5555555555555554) internal successors, (46), 18 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2021-02-19 19:28:21,555 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 19:28:21,557 INFO L225 Difference]: With dead ends: 1650 [2021-02-19 19:28:21,557 INFO L226 Difference]: Without dead ends: 1635 [2021-02-19 19:28:21,557 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 297 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=198, Invalid=992, Unknown=0, NotChecked=0, Total=1190 [2021-02-19 19:28:21,559 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1635 states. [2021-02-19 19:28:21,570 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1635 to 1163. [2021-02-19 19:28:21,571 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1163 states, 1162 states have (on average 3.37263339070568) internal successors, (3919), 1162 states have internal predecessors, (3919), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:28:21,574 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1163 states to 1163 states and 3919 transitions. [2021-02-19 19:28:21,574 INFO L78 Accepts]: Start accepts. Automaton has 1163 states and 3919 transitions. Word has length 26 [2021-02-19 19:28:21,574 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 19:28:21,575 INFO L480 AbstractCegarLoop]: Abstraction has 1163 states and 3919 transitions. [2021-02-19 19:28:21,575 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.5555555555555554) internal successors, (46), 18 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:28:21,575 INFO L276 IsEmpty]: Start isEmpty. Operand 1163 states and 3919 transitions. [2021-02-19 19:28:21,577 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-02-19 19:28:21,577 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 19:28:21,577 INFO L506 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 19:28:21,794 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable45 [2021-02-19 19:28:21,794 INFO L428 AbstractCegarLoop]: === Iteration 43 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 19:28:21,794 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 19:28:21,794 INFO L82 PathProgramCache]: Analyzing trace with hash -1968227726, now seen corresponding path program 5 times [2021-02-19 19:28:21,794 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 19:28:21,794 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2111310443] [2021-02-19 19:28:21,794 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 19:28:21,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:28:22,037 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:28:22,037 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2111310443] [2021-02-19 19:28:22,037 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2129630083] [2021-02-19 19:28:22,037 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 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 [2021-02-19 19:28:22,065 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-02-19 19:28:22,065 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 19:28:22,066 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 27 conjunts are in the unsatisfiable core [2021-02-19 19:28:22,066 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 19:28:22,250 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-02-19 19:28:22,250 INFO L173 IndexEqualityManager]: detected equality via solver [2021-02-19 19:28:22,251 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2021-02-19 19:28:22,252 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-02-19 19:28:22,257 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-02-19 19:28:22,258 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-02-19 19:28:22,258 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:3 [2021-02-19 19:28:22,285 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:28:22,285 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 19:28:22,285 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 19 [2021-02-19 19:28:22,285 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [897895417] [2021-02-19 19:28:22,286 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-02-19 19:28:22,286 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 19:28:22,286 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-02-19 19:28:22,286 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=287, Unknown=0, NotChecked=0, Total=342 [2021-02-19 19:28:22,287 INFO L87 Difference]: Start difference. First operand 1163 states and 3919 transitions. Second operand has 19 states, 19 states have (on average 2.263157894736842) internal successors, (43), 19 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) [2021-02-19 19:28:22,955 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 19:28:22,955 INFO L93 Difference]: Finished difference Result 1525 states and 5006 transitions. [2021-02-19 19:28:22,955 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-02-19 19:28:22,956 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.263157894736842) internal successors, (43), 19 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 26 [2021-02-19 19:28:22,956 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 19:28:22,958 INFO L225 Difference]: With dead ends: 1525 [2021-02-19 19:28:22,958 INFO L226 Difference]: Without dead ends: 1510 [2021-02-19 19:28:22,958 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 18 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 248 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=177, Invalid=815, Unknown=0, NotChecked=0, Total=992 [2021-02-19 19:28:22,959 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1510 states. [2021-02-19 19:28:22,969 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1510 to 1180. [2021-02-19 19:28:22,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1180 states, 1179 states have (on average 3.3621713316369806) internal successors, (3964), 1179 states have internal predecessors, (3964), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:28:22,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1180 states to 1180 states and 3964 transitions. [2021-02-19 19:28:22,972 INFO L78 Accepts]: Start accepts. Automaton has 1180 states and 3964 transitions. Word has length 26 [2021-02-19 19:28:22,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 19:28:22,973 INFO L480 AbstractCegarLoop]: Abstraction has 1180 states and 3964 transitions. [2021-02-19 19:28:22,973 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 2.263157894736842) internal successors, (43), 19 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) [2021-02-19 19:28:22,973 INFO L276 IsEmpty]: Start isEmpty. Operand 1180 states and 3964 transitions. [2021-02-19 19:28:22,975 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-02-19 19:28:22,975 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 19:28:22,975 INFO L506 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 19:28:23,175 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46,41 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 19:28:23,175 INFO L428 AbstractCegarLoop]: === Iteration 44 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 19:28:23,176 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 19:28:23,176 INFO L82 PathProgramCache]: Analyzing trace with hash -376798418, now seen corresponding path program 36 times [2021-02-19 19:28:23,176 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 19:28:23,176 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1553526404] [2021-02-19 19:28:23,176 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 19:28:23,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:28:23,531 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:28:23,531 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1553526404] [2021-02-19 19:28:23,531 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2046495232] [2021-02-19 19:28:23,531 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 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 [2021-02-19 19:28:23,558 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-02-19 19:28:23,559 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 19:28:23,559 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 25 conjunts are in the unsatisfiable core [2021-02-19 19:28:23,560 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 19:28:23,723 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-02-19 19:28:23,724 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-02-19 19:28:23,724 INFO L173 IndexEqualityManager]: detected equality via solver [2021-02-19 19:28:23,725 INFO L173 IndexEqualityManager]: detected equality via solver [2021-02-19 19:28:23,725 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 11 [2021-02-19 19:28:23,726 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-02-19 19:28:23,730 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-02-19 19:28:23,731 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-02-19 19:28:23,731 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:27, output treesize:3 [2021-02-19 19:28:23,747 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:28:23,747 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 19:28:23,747 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9] total 16 [2021-02-19 19:28:23,747 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1444829429] [2021-02-19 19:28:23,747 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-02-19 19:28:23,747 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 19:28:23,747 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-02-19 19:28:23,748 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=221, Unknown=0, NotChecked=0, Total=272 [2021-02-19 19:28:23,748 INFO L87 Difference]: Start difference. First operand 1180 states and 3964 transitions. Second operand has 17 states, 17 states have (on average 2.6470588235294117) internal successors, (45), 16 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:28:25,411 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 19:28:25,411 INFO L93 Difference]: Finished difference Result 1675 states and 5418 transitions. [2021-02-19 19:28:25,411 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-02-19 19:28:25,411 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.6470588235294117) internal successors, (45), 16 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2021-02-19 19:28:25,411 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 19:28:25,414 INFO L225 Difference]: With dead ends: 1675 [2021-02-19 19:28:25,414 INFO L226 Difference]: Without dead ends: 1660 [2021-02-19 19:28:25,415 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 19 SyntacticMatches, 2 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 476 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=311, Invalid=1495, Unknown=0, NotChecked=0, Total=1806 [2021-02-19 19:28:25,416 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1660 states. [2021-02-19 19:28:25,428 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1660 to 1204. [2021-02-19 19:28:25,429 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1204 states, 1203 states have (on average 3.344139650872818) internal successors, (4023), 1203 states have internal predecessors, (4023), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:28:25,432 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1204 states to 1204 states and 4023 transitions. [2021-02-19 19:28:25,432 INFO L78 Accepts]: Start accepts. Automaton has 1204 states and 4023 transitions. Word has length 26 [2021-02-19 19:28:25,432 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 19:28:25,432 INFO L480 AbstractCegarLoop]: Abstraction has 1204 states and 4023 transitions. [2021-02-19 19:28:25,432 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.6470588235294117) internal successors, (45), 16 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:28:25,432 INFO L276 IsEmpty]: Start isEmpty. Operand 1204 states and 4023 transitions. [2021-02-19 19:28:25,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-02-19 19:28:25,434 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 19:28:25,434 INFO L506 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 19:28:25,634 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2021-02-19 19:28:25,635 INFO L428 AbstractCegarLoop]: === Iteration 45 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 19:28:25,635 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 19:28:25,635 INFO L82 PathProgramCache]: Analyzing trace with hash 428248758, now seen corresponding path program 6 times [2021-02-19 19:28:25,635 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 19:28:25,635 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1696981959] [2021-02-19 19:28:25,635 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 19:28:25,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:28:25,862 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:28:25,862 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1696981959] [2021-02-19 19:28:25,862 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1025021425] [2021-02-19 19:28:25,862 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 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 [2021-02-19 19:28:25,882 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-02-19 19:28:25,882 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 19:28:25,883 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 25 conjunts are in the unsatisfiable core [2021-02-19 19:28:25,883 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 19:28:26,006 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-02-19 19:28:26,012 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-02-19 19:28:26,012 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 19 [2021-02-19 19:28:26,015 INFO L550 ElimStorePlain]: Start of recursive call 2: 1 dim-0 vars, End of recursive call: and 2 xjuncts. [2021-02-19 19:28:26,021 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-02-19 19:28:26,021 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-02-19 19:28:26,022 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:15 [2021-02-19 19:28:26,064 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:28:26,064 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 19:28:26,064 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 18 [2021-02-19 19:28:26,064 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [284545036] [2021-02-19 19:28:26,064 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-02-19 19:28:26,065 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 19:28:26,065 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-02-19 19:28:26,065 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=256, Unknown=0, NotChecked=0, Total=306 [2021-02-19 19:28:26,065 INFO L87 Difference]: Start difference. First operand 1204 states and 4023 transitions. Second operand has 18 states, 18 states have (on average 2.4444444444444446) internal successors, (44), 18 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:28:27,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 19:28:27,509 INFO L93 Difference]: Finished difference Result 1871 states and 5965 transitions. [2021-02-19 19:28:27,511 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-02-19 19:28:27,511 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.4444444444444446) internal successors, (44), 18 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2021-02-19 19:28:27,511 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 19:28:27,514 INFO L225 Difference]: With dead ends: 1871 [2021-02-19 19:28:27,514 INFO L226 Difference]: Without dead ends: 1856 [2021-02-19 19:28:27,515 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 489 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=276, Invalid=1530, Unknown=0, NotChecked=0, Total=1806 [2021-02-19 19:28:27,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1856 states. [2021-02-19 19:28:27,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1856 to 1222. [2021-02-19 19:28:27,538 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1222 states, 1221 states have (on average 3.3497133497133498) internal successors, (4090), 1221 states have internal predecessors, (4090), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:28:27,541 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1222 states to 1222 states and 4090 transitions. [2021-02-19 19:28:27,541 INFO L78 Accepts]: Start accepts. Automaton has 1222 states and 4090 transitions. Word has length 26 [2021-02-19 19:28:27,541 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 19:28:27,541 INFO L480 AbstractCegarLoop]: Abstraction has 1222 states and 4090 transitions. [2021-02-19 19:28:27,541 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.4444444444444446) internal successors, (44), 18 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:28:27,541 INFO L276 IsEmpty]: Start isEmpty. Operand 1222 states and 4090 transitions. [2021-02-19 19:28:27,543 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-02-19 19:28:27,543 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 19:28:27,543 INFO L506 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 19:28:27,743 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48 [2021-02-19 19:28:27,743 INFO L428 AbstractCegarLoop]: === Iteration 46 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 19:28:27,744 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 19:28:27,744 INFO L82 PathProgramCache]: Analyzing trace with hash 1978630322, now seen corresponding path program 37 times [2021-02-19 19:28:27,744 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 19:28:27,744 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1168090040] [2021-02-19 19:28:27,744 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 19:28:27,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:28:28,047 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:28:28,048 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1168090040] [2021-02-19 19:28:28,048 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [907957453] [2021-02-19 19:28:28,048 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 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 [2021-02-19 19:28:28,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:28:28,067 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 24 conjunts are in the unsatisfiable core [2021-02-19 19:28:28,068 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 19:28:28,233 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-02-19 19:28:28,233 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-02-19 19:28:28,234 INFO L173 IndexEqualityManager]: detected equality via solver [2021-02-19 19:28:28,234 INFO L173 IndexEqualityManager]: detected equality via solver [2021-02-19 19:28:28,235 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 11 [2021-02-19 19:28:28,236 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-02-19 19:28:28,239 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-02-19 19:28:28,240 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-02-19 19:28:28,240 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:27, output treesize:3 [2021-02-19 19:28:28,259 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:28:28,259 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 19:28:28,259 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9] total 17 [2021-02-19 19:28:28,259 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1257441499] [2021-02-19 19:28:28,259 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-02-19 19:28:28,259 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 19:28:28,259 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-02-19 19:28:28,260 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2021-02-19 19:28:28,260 INFO L87 Difference]: Start difference. First operand 1222 states and 4090 transitions. Second operand has 18 states, 18 states have (on average 2.5555555555555554) internal successors, (46), 17 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:28:30,120 WARN L202 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 43 [2021-02-19 19:28:30,452 WARN L202 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 37 [2021-02-19 19:28:30,926 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 19:28:30,926 INFO L93 Difference]: Finished difference Result 1892 states and 6052 transitions. [2021-02-19 19:28:30,926 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-02-19 19:28:30,926 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.5555555555555554) internal successors, (46), 17 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2021-02-19 19:28:30,927 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 19:28:30,929 INFO L225 Difference]: With dead ends: 1892 [2021-02-19 19:28:30,930 INFO L226 Difference]: Without dead ends: 1877 [2021-02-19 19:28:30,930 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 756 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=468, Invalid=2184, Unknown=0, NotChecked=0, Total=2652 [2021-02-19 19:28:30,932 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1877 states. [2021-02-19 19:28:30,943 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1877 to 1227. [2021-02-19 19:28:30,944 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1227 states, 1226 states have (on average 3.3515497553017943) internal successors, (4109), 1226 states have internal predecessors, (4109), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:28:30,946 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1227 states to 1227 states and 4109 transitions. [2021-02-19 19:28:30,946 INFO L78 Accepts]: Start accepts. Automaton has 1227 states and 4109 transitions. Word has length 26 [2021-02-19 19:28:30,946 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 19:28:30,946 INFO L480 AbstractCegarLoop]: Abstraction has 1227 states and 4109 transitions. [2021-02-19 19:28:30,946 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.5555555555555554) internal successors, (46), 17 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:28:30,946 INFO L276 IsEmpty]: Start isEmpty. Operand 1227 states and 4109 transitions. [2021-02-19 19:28:30,948 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-02-19 19:28:30,948 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 19:28:30,948 INFO L506 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 19:28:31,148 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,44 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 19:28:31,148 INFO L428 AbstractCegarLoop]: === Iteration 47 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 19:28:31,149 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 19:28:31,149 INFO L82 PathProgramCache]: Analyzing trace with hash 1002311478, now seen corresponding path program 38 times [2021-02-19 19:28:31,149 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 19:28:31,149 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [276695489] [2021-02-19 19:28:31,149 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 19:28:31,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:28:31,402 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:28:31,403 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [276695489] [2021-02-19 19:28:31,403 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [509602041] [2021-02-19 19:28:31,403 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 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 [2021-02-19 19:28:31,432 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-02-19 19:28:31,432 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 19:28:31,432 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 25 conjunts are in the unsatisfiable core [2021-02-19 19:28:31,433 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 19:28:31,718 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-02-19 19:28:31,718 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 48 treesize of output 79 [2021-02-19 19:28:32,014 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 14 xjuncts. [2021-02-19 19:28:33,542 WARN L202 SmtUtils]: Spent 1.53 s on a formula simplification. DAG size of input: 251 DAG size of output: 91 [2021-02-19 19:28:33,543 INFO L628 ElimStorePlain]: treesize reduction 3915, result has 7.0 percent of original size [2021-02-19 19:28:33,796 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-02-19 19:28:33,796 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:67, output treesize:2400 [2021-02-19 19:28:34,613 WARN L202 SmtUtils]: Spent 666.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 107 [2021-02-19 19:28:34,938 WARN L202 SmtUtils]: Spent 193.00 ms on a formula simplification. DAG size of input: 76 DAG size of output: 65 Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown