/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -s ../../../trunk/examples/settings/automizer/concurrent/svcomp-Reach-32bit-Automizer_Default-noMmResRef-FA-NoLbe.epf -tc ../../../trunk/examples/toolchains/AutomizerBplInline.xml -i ../../../trunk/examples/concurrent/bpl/weaver-benchmarks/generated/unroll-cond-5.wvr.bpl -------------------------------------------------------------------------------- This is Ultimate 0.2.1-a47a088281b0b97d17910950432b7c5b5bc3adeb-a47a088 [2021-07-13 19:24:40,587 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-07-13 19:24:40,589 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-07-13 19:24:40,611 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-07-13 19:24:40,640 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 [2021-07-13 19:24:40,683 INFO L113 SettingsManager]: Loading preferences was successful [2021-07-13 19:24:40,684 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-07-13 19:24:40,685 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-07-13 19:24:40,685 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-07-13 19:24:40,687 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-07-13 19:24:40,687 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-07-13 19:24:40,687 INFO L138 SettingsManager]: * Use SBE=true [2021-07-13 19:24:40,687 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-07-13 19:24:40,688 INFO L138 SettingsManager]: * sizeof long=4 [2021-07-13 19:24:40,688 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-07-13 19:24:40,688 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-07-13 19:24:40,689 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-07-13 19:24:40,689 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-07-13 19:24:40,689 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-07-13 19:24:40,689 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-07-13 19:24:40,689 INFO L138 SettingsManager]: * sizeof long double=12 [2021-07-13 19:24:40,689 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-07-13 19:24:40,689 INFO L138 SettingsManager]: * Use constant arrays=true [2021-07-13 19:24:40,690 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-07-13 19:24:40,690 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-07-13 19:24:40,690 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-07-13 19:24:40,690 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-07-13 19:24:40,690 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-07-13 19:24:40,690 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-07-13 19:24:40,690 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-07-13 19:24:40,691 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-07-13 19:24:40,691 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-07-13 19:24:40,691 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-07-13 19:24:40,691 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-07-13 19:24:40,691 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-07-13 19:24:40,692 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-07-13 19:24:40,692 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-07-13 19:24:40,976 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-07-13 19:24:40,995 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-07-13 19:24:40,998 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-07-13 19:24:40,999 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2021-07-13 19:24:41,000 INFO L275 PluginConnector]: Boogie PL CUP Parser initialized [2021-07-13 19:24:41,001 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/weaver-benchmarks/generated/unroll-cond-5.wvr.bpl [2021-07-13 19:24:41,001 INFO L110 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/weaver-benchmarks/generated/unroll-cond-5.wvr.bpl' [2021-07-13 19:24:41,025 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-07-13 19:24:41,027 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-07-13 19:24:41,028 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-07-13 19:24:41,028 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-07-13 19:24:41,028 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-07-13 19:24:41,040 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "unroll-cond-5.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 13.07 07:24:41" (1/1) ... [2021-07-13 19:24:41,049 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "unroll-cond-5.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 13.07 07:24:41" (1/1) ... [2021-07-13 19:24:41,055 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-07-13 19:24:41,057 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-07-13 19:24:41,057 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-07-13 19:24:41,057 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-07-13 19:24:41,065 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "unroll-cond-5.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 13.07 07:24:41" (1/1) ... [2021-07-13 19:24:41,065 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "unroll-cond-5.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 13.07 07:24:41" (1/1) ... [2021-07-13 19:24:41,066 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "unroll-cond-5.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 13.07 07:24:41" (1/1) ... [2021-07-13 19:24:41,067 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "unroll-cond-5.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 13.07 07:24:41" (1/1) ... [2021-07-13 19:24:41,070 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "unroll-cond-5.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 13.07 07:24:41" (1/1) ... [2021-07-13 19:24:41,073 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "unroll-cond-5.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 13.07 07:24:41" (1/1) ... [2021-07-13 19:24:41,074 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "unroll-cond-5.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 13.07 07:24:41" (1/1) ... [2021-07-13 19:24:41,075 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-07-13 19:24:41,076 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-07-13 19:24:41,076 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-07-13 19:24:41,076 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-07-13 19:24:41,081 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "unroll-cond-5.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 13.07 07:24:41" (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 [2021-07-13 19:24:41,153 INFO L124 BoogieDeclarations]: Specification and implementation of procedure thread1 given in one single declaration [2021-07-13 19:24:41,154 INFO L130 BoogieDeclarations]: Found specification of procedure thread1 [2021-07-13 19:24:41,154 INFO L138 BoogieDeclarations]: Found implementation of procedure thread1 [2021-07-13 19:24:41,154 INFO L124 BoogieDeclarations]: Specification and implementation of procedure thread2 given in one single declaration [2021-07-13 19:24:41,154 INFO L130 BoogieDeclarations]: Found specification of procedure thread2 [2021-07-13 19:24:41,155 INFO L138 BoogieDeclarations]: Found implementation of procedure thread2 [2021-07-13 19:24:41,155 INFO L124 BoogieDeclarations]: Specification and implementation of procedure ULTIMATE.start given in one single declaration [2021-07-13 19:24:41,155 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-07-13 19:24:41,155 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-07-13 19:24:41,156 WARN L209 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to SingleStatement [2021-07-13 19:24:41,523 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-07-13 19:24:41,523 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-07-13 19:24:41,524 WARN L327 CfgBuilder]: Unexpected successor node of atomic block begin: thread1EXIT is neither atomic block end nor error location. [2021-07-13 19:24:41,533 INFO L202 PluginConnector]: Adding new model unroll-cond-5.wvr.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.07 07:24:41 BoogieIcfgContainer [2021-07-13 19:24:41,533 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-07-13 19:24:41,535 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-07-13 19:24:41,535 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-07-13 19:24:41,538 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-07-13 19:24:41,538 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "unroll-cond-5.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 13.07 07:24:41" (1/2) ... [2021-07-13 19:24:41,539 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@304302eb and model type unroll-cond-5.wvr.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.07 07:24:41, skipping insertion in model container [2021-07-13 19:24:41,539 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "unroll-cond-5.wvr.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.07 07:24:41" (2/2) ... [2021-07-13 19:24:41,544 INFO L111 eAbstractionObserver]: Analyzing ICFG unroll-cond-5.wvr.bpl [2021-07-13 19:24:41,550 WARN L148 ceAbstractionStarter]: Switching off computation of Hoare annotation because input is a concurrent program [2021-07-13 19:24:41,550 INFO L214 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-07-13 19:24:41,550 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-07-13 19:24:41,554 INFO L474 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2021-07-13 19:24:41,601 INFO L149 ThreadInstanceAdder]: Constructed 2 joinOtherThreadTransitions. [2021-07-13 19:24:41,629 INFO L255 AbstractCegarLoop]: Starting to check reachability of 3 error locations. [2021-07-13 19:24:41,658 INFO L378 AbstractCegarLoop]: Interprodecural is true [2021-07-13 19:24:41,658 INFO L379 AbstractCegarLoop]: Hoare is false [2021-07-13 19:24:41,658 INFO L380 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-07-13 19:24:41,659 INFO L381 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-07-13 19:24:41,659 INFO L382 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-07-13 19:24:41,659 INFO L383 AbstractCegarLoop]: Difference is false [2021-07-13 19:24:41,659 INFO L384 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-07-13 19:24:41,659 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.start======== [2021-07-13 19:24:41,671 INFO L110 iNet2FiniteAutomaton]: Start petriNet2FiniteAutomaton. Operand has 21 places, 16 transitions, 48 flow [2021-07-13 19:24:41,682 INFO L132 iNet2FiniteAutomaton]: Finished petriNet2FiniteAutomaton. Result has 16 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:24:41,684 INFO L276 IsEmpty]: Start isEmpty. Operand has 16 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:24:41,689 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-07-13 19:24:41,690 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:24:41,690 INFO L508 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:24:41,691 INFO L430 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-07-13 19:24:41,696 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:24:41,697 INFO L82 PathProgramCache]: Analyzing trace with hash 1938062105, now seen corresponding path program 1 times [2021-07-13 19:24:41,713 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:24:41,715 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [340126265] [2021-07-13 19:24:41,715 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:24:41,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:24:41,966 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:24:41,967 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:24:41,967 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [340126265] [2021-07-13 19:24:41,968 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [340126265] provided 1 perfect and 0 imperfect interpolant sequences [2021-07-13 19:24:41,968 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-07-13 19:24:41,968 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-07-13 19:24:41,968 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1947031811] [2021-07-13 19:24:41,971 INFO L462 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-07-13 19:24:41,972 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:24:41,981 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-07-13 19:24:41,982 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-07-13 19:24:41,984 INFO L87 Difference]: Start difference. First operand has 16 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:24:42,033 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:24:42,033 INFO L93 Difference]: Finished difference Result 26 states and 43 transitions. [2021-07-13 19:24:42,034 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-07-13 19:24:42,035 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2021-07-13 19:24:42,036 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:24:42,044 INFO L225 Difference]: With dead ends: 26 [2021-07-13 19:24:42,044 INFO L226 Difference]: Without dead ends: 18 [2021-07-13 19:24:42,046 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 47.3ms TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2021-07-13 19:24:42,059 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-07-13 19:24:42,071 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2021-07-13 19:24:42,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 17 states have (on average 1.8823529411764706) internal successors, (32), 17 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:24:42,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 32 transitions. [2021-07-13 19:24:42,075 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 32 transitions. Word has length 10 [2021-07-13 19:24:42,075 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:24:42,075 INFO L482 AbstractCegarLoop]: Abstraction has 18 states and 32 transitions. [2021-07-13 19:24:42,075 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:24:42,076 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 32 transitions. [2021-07-13 19:24:42,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-07-13 19:24:42,076 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:24:42,077 INFO L508 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:24:42,077 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-07-13 19:24:42,077 INFO L430 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-07-13 19:24:42,080 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:24:42,081 INFO L82 PathProgramCache]: Analyzing trace with hash -1613321831, now seen corresponding path program 2 times [2021-07-13 19:24:42,081 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:24:42,081 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [549306939] [2021-07-13 19:24:42,082 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:24:42,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:24:42,182 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:24:42,183 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:24:42,183 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [549306939] [2021-07-13 19:24:42,183 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [549306939] provided 1 perfect and 0 imperfect interpolant sequences [2021-07-13 19:24:42,184 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-07-13 19:24:42,184 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-07-13 19:24:42,185 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [599778175] [2021-07-13 19:24:42,186 INFO L462 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-07-13 19:24:42,186 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:24:42,187 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-07-13 19:24:42,188 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-07-13 19:24:42,189 INFO L87 Difference]: Start difference. First operand 18 states and 32 transitions. Second operand has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:24:42,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:24:42,229 INFO L93 Difference]: Finished difference Result 28 states and 51 transitions. [2021-07-13 19:24:42,229 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-07-13 19:24:42,229 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2021-07-13 19:24:42,230 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:24:42,231 INFO L225 Difference]: With dead ends: 28 [2021-07-13 19:24:42,231 INFO L226 Difference]: Without dead ends: 23 [2021-07-13 19:24:42,234 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 26.5ms TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-07-13 19:24:42,234 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-07-13 19:24:42,242 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 20. [2021-07-13 19:24:42,242 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.8421052631578947) internal successors, (35), 19 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:24:42,243 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 35 transitions. [2021-07-13 19:24:42,243 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 35 transitions. Word has length 10 [2021-07-13 19:24:42,243 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:24:42,243 INFO L482 AbstractCegarLoop]: Abstraction has 20 states and 35 transitions. [2021-07-13 19:24:42,243 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:24:42,244 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 35 transitions. [2021-07-13 19:24:42,244 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-07-13 19:24:42,245 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:24:42,245 INFO L508 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:24:42,246 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-07-13 19:24:42,246 INFO L430 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-07-13 19:24:42,247 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:24:42,247 INFO L82 PathProgramCache]: Analyzing trace with hash -104131845, now seen corresponding path program 1 times [2021-07-13 19:24:42,248 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:24:42,248 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1877610247] [2021-07-13 19:24:42,248 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:24:42,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:24:43,630 WARN L205 SmtUtils]: Spent 1.17 s on a formula simplification. DAG size of input: 5498 DAG size of output: 50 [2021-07-13 19:24:43,788 WARN L205 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 35 [2021-07-13 19:24:44,523 WARN L205 SmtUtils]: Spent 683.00 ms on a formula simplification. DAG size of input: 5496 DAG size of output: 12 [2021-07-13 19:24:44,541 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:24:44,541 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:24:44,541 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1877610247] [2021-07-13 19:24:44,541 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1877610247] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:24:44,542 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1483836761] [2021-07-13 19:24:44,542 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 [2021-07-13 19:24:44,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:24:44,599 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 16 conjunts are in the unsatisfiable core [2021-07-13 19:24:44,603 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:24:46,006 WARN L205 SmtUtils]: Spent 1.21 s on a formula simplification. DAG size of input: 2125 DAG size of output: 13 [2021-07-13 19:24:46,067 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 [2021-07-13 19:24:46,071 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:24:46,085 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:24:46,092 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:24:46,092 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:11, output treesize:3 [2021-07-13 19:24:46,105 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:24:46,106 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1483836761] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:24:46,106 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:24:46,106 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2021-07-13 19:24:46,106 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1099460043] [2021-07-13 19:24:46,106 INFO L462 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-07-13 19:24:46,107 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:24:46,107 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-07-13 19:24:46,107 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2021-07-13 19:24:46,108 INFO L87 Difference]: Start difference. First operand 20 states and 35 transitions. Second operand has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:24:46,172 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:24:46,172 INFO L93 Difference]: Finished difference Result 30 states and 51 transitions. [2021-07-13 19:24:46,173 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-07-13 19:24:46,173 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-07-13 19:24:46,173 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:24:46,173 INFO L225 Difference]: With dead ends: 30 [2021-07-13 19:24:46,174 INFO L226 Difference]: Without dead ends: 22 [2021-07-13 19:24:46,174 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 238.0ms TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2021-07-13 19:24:46,174 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-07-13 19:24:46,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2021-07-13 19:24:46,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 21 states have (on average 1.9047619047619047) internal successors, (40), 21 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:24:46,177 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 40 transitions. [2021-07-13 19:24:46,177 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 40 transitions. Word has length 11 [2021-07-13 19:24:46,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:24:46,177 INFO L482 AbstractCegarLoop]: Abstraction has 22 states and 40 transitions. [2021-07-13 19:24:46,177 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:24:46,178 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 40 transitions. [2021-07-13 19:24:46,178 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-07-13 19:24:46,178 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:24:46,178 INFO L508 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:24:46,391 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-07-13 19:24:46,391 INFO L430 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-07-13 19:24:46,392 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:24:46,392 INFO L82 PathProgramCache]: Analyzing trace with hash 639451515, now seen corresponding path program 2 times [2021-07-13 19:24:46,392 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:24:46,392 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [331625224] [2021-07-13 19:24:46,392 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:24:46,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:24:47,340 WARN L205 SmtUtils]: Spent 867.00 ms on a formula simplification. DAG size of input: 5498 DAG size of output: 50 [2021-07-13 19:24:47,475 WARN L205 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 35 [2021-07-13 19:24:47,490 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:24:47,491 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:24:47,491 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [331625224] [2021-07-13 19:24:47,491 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [331625224] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:24:47,491 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1314905069] [2021-07-13 19:24:47,491 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 [2021-07-13 19:24:47,527 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 19:24:47,527 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:24:47,528 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 16 conjunts are in the unsatisfiable core [2021-07-13 19:24:47,529 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:24:48,572 WARN L205 SmtUtils]: Spent 965.00 ms on a formula simplification. DAG size of input: 2127 DAG size of output: 38 [2021-07-13 19:24:48,611 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 [2021-07-13 19:24:48,613 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:24:48,629 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:24:48,630 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 3 case distinctions, treesize of input 15 treesize of output 37 [2021-07-13 19:24:48,648 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 2 xjuncts. [2021-07-13 19:24:48,656 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:24:48,657 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 18 [2021-07-13 19:24:48,661 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 2 xjuncts. [2021-07-13 19:24:48,684 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:24:48,684 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 7 new quantified variables, introduced 6 case distinctions, treesize of input 17 treesize of output 64 [2021-07-13 19:24:48,743 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 2 xjuncts. [2021-07-13 19:24:48,810 INFO L628 ElimStorePlain]: treesize reduction 61, result has 26.5 percent of original size [2021-07-13 19:24:48,813 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-07-13 19:24:48,813 INFO L247 ElimStorePlain]: Needed 5 recursive calls to eliminate 1 variables, input treesize:108, output treesize:22 [2021-07-13 19:24:48,863 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:24:48,863 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1314905069] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:24:48,863 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:24:48,863 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2021-07-13 19:24:48,864 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1307409666] [2021-07-13 19:24:48,866 INFO L462 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-07-13 19:24:48,866 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:24:48,866 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-07-13 19:24:48,867 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-07-13 19:24:48,867 INFO L87 Difference]: Start difference. First operand 22 states and 40 transitions. Second operand has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:24:48,956 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:24:48,956 INFO L93 Difference]: Finished difference Result 35 states and 68 transitions. [2021-07-13 19:24:48,956 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-07-13 19:24:48,956 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-07-13 19:24:48,958 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:24:48,958 INFO L225 Difference]: With dead ends: 35 [2021-07-13 19:24:48,958 INFO L226 Difference]: Without dead ends: 30 [2021-07-13 19:24:48,959 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 204.8ms TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-07-13 19:24:48,959 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-07-13 19:24:48,964 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 22. [2021-07-13 19:24:48,964 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 21 states have (on average 1.9047619047619047) internal successors, (40), 21 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:24:48,965 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 40 transitions. [2021-07-13 19:24:48,965 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 40 transitions. Word has length 11 [2021-07-13 19:24:48,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:24:48,965 INFO L482 AbstractCegarLoop]: Abstraction has 22 states and 40 transitions. [2021-07-13 19:24:48,965 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:24:48,966 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 40 transitions. [2021-07-13 19:24:48,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-07-13 19:24:48,966 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:24:48,966 INFO L508 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:24:49,187 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:24:49,188 INFO L430 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-07-13 19:24:49,188 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:24:49,188 INFO L82 PathProgramCache]: Analyzing trace with hash 1490595647, now seen corresponding path program 3 times [2021-07-13 19:24:49,188 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:24:49,189 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1065066884] [2021-07-13 19:24:49,189 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:24:49,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:24:49,254 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:24:49,254 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:24:49,255 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1065066884] [2021-07-13 19:24:49,255 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1065066884] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:24:49,255 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1967069760] [2021-07-13 19:24:49,255 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 [2021-07-13 19:24:49,295 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-07-13 19:24:49,295 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:24:49,296 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 16 conjunts are in the unsatisfiable core [2021-07-13 19:24:49,298 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:28:12,548 WARN L205 SmtUtils]: Spent 3.37 m on a formula simplification. DAG size of input: 112621 DAG size of output: 44 [2021-07-13 19:28:12,645 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:28:12,646 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 3 case distinctions, treesize of input 15 treesize of output 37 [2021-07-13 19:28:12,653 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 2 xjuncts. [2021-07-13 19:28:12,662 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:28:12,663 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 18 [2021-07-13 19:28:12,664 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 2 xjuncts. [2021-07-13 19:28:12,667 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 [2021-07-13 19:28:12,668 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-07-13 19:28:12,691 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:28:12,691 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 7 new quantified variables, introduced 6 case distinctions, treesize of input 17 treesize of output 64 [2021-07-13 19:28:12,725 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 2 xjuncts. [2021-07-13 19:28:12,792 INFO L628 ElimStorePlain]: treesize reduction 58, result has 27.5 percent of original size [2021-07-13 19:28:12,793 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-07-13 19:28:12,793 INFO L247 ElimStorePlain]: Needed 5 recursive calls to eliminate 1 variables, input treesize:105, output treesize:22 [2021-07-13 19:28:12,839 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:28:12,839 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1967069760] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:28:12,840 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:28:12,840 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2021-07-13 19:28:12,840 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2033931551] [2021-07-13 19:28:12,840 INFO L462 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-07-13 19:28:12,840 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:28:12,841 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-07-13 19:28:12,841 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-07-13 19:28:12,841 INFO L87 Difference]: Start difference. First operand 22 states and 40 transitions. Second operand has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:28:12,972 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:28:12,972 INFO L93 Difference]: Finished difference Result 51 states and 88 transitions. [2021-07-13 19:28:12,973 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-07-13 19:28:12,973 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-07-13 19:28:12,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:28:12,973 INFO L225 Difference]: With dead ends: 51 [2021-07-13 19:28:12,974 INFO L226 Difference]: Without dead ends: 41 [2021-07-13 19:28:12,974 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 181.6ms TimeCoverageRelationStatistics Valid=50, Invalid=106, Unknown=0, NotChecked=0, Total=156 [2021-07-13 19:28:12,974 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-07-13 19:28:12,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 26. [2021-07-13 19:28:12,977 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 25 states have (on average 1.84) internal successors, (46), 25 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:28:12,978 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 46 transitions. [2021-07-13 19:28:12,978 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 46 transitions. Word has length 11 [2021-07-13 19:28:12,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:28:12,978 INFO L482 AbstractCegarLoop]: Abstraction has 26 states and 46 transitions. [2021-07-13 19:28:12,978 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:28:12,978 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 46 transitions. [2021-07-13 19:28:12,979 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-07-13 19:28:12,979 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:28:12,979 INFO L508 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:28:13,202 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:28:13,202 INFO L430 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-07-13 19:28:13,202 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:28:13,203 INFO L82 PathProgramCache]: Analyzing trace with hash 829331864, now seen corresponding path program 1 times [2021-07-13 19:28:13,203 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:28:13,203 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1115479713] [2021-07-13 19:28:13,203 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:28:13,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:28:13,220 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:28:13,220 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:28:13,221 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1115479713] [2021-07-13 19:28:13,221 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1115479713] provided 1 perfect and 0 imperfect interpolant sequences [2021-07-13 19:28:13,221 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-07-13 19:28:13,221 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-07-13 19:28:13,221 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [452043800] [2021-07-13 19:28:13,221 INFO L462 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-07-13 19:28:13,221 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:28:13,222 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-07-13 19:28:13,222 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-07-13 19:28:13,222 INFO L87 Difference]: Start difference. First operand 26 states and 46 transitions. Second operand has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:28:13,236 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:28:13,236 INFO L93 Difference]: Finished difference Result 29 states and 52 transitions. [2021-07-13 19:28:13,236 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-07-13 19:28:13,236 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-07-13 19:28:13,236 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:28:13,237 INFO L225 Difference]: With dead ends: 29 [2021-07-13 19:28:13,237 INFO L226 Difference]: Without dead ends: 29 [2021-07-13 19:28:13,237 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 8.0ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-07-13 19:28:13,237 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-07-13 19:28:13,239 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 27. [2021-07-13 19:28:13,239 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.8846153846153846) internal successors, (49), 26 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:28:13,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 49 transitions. [2021-07-13 19:28:13,240 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 49 transitions. Word has length 11 [2021-07-13 19:28:13,240 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:28:13,240 INFO L482 AbstractCegarLoop]: Abstraction has 27 states and 49 transitions. [2021-07-13 19:28:13,240 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:28:13,241 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 49 transitions. [2021-07-13 19:28:13,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-07-13 19:28:13,241 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:28:13,241 INFO L508 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:28:13,241 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2021-07-13 19:28:13,241 INFO L430 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-07-13 19:28:13,242 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:28:13,242 INFO L82 PathProgramCache]: Analyzing trace with hash 1012365145, now seen corresponding path program 4 times [2021-07-13 19:28:13,242 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:28:13,242 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2078369756] [2021-07-13 19:28:13,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:28:13,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:28:13,756 WARN L205 SmtUtils]: Spent 434.00 ms on a formula simplification. DAG size of input: 2846 DAG size of output: 46 [2021-07-13 19:28:14,673 WARN L205 SmtUtils]: Spent 771.00 ms on a formula simplification. DAG size of input: 5518 DAG size of output: 38 [2021-07-13 19:28:15,519 WARN L205 SmtUtils]: Spent 740.00 ms on a formula simplification. DAG size of input: 5516 DAG size of output: 13 [2021-07-13 19:28:15,549 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:28:15,549 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:28:15,549 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2078369756] [2021-07-13 19:28:15,549 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2078369756] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:28:15,549 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1920662415] [2021-07-13 19:28:15,549 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 [2021-07-13 19:28:15,585 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-07-13 19:28:15,585 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:28:15,586 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 20 conjunts are in the unsatisfiable core [2021-07-13 19:28:15,587 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:28:16,539 WARN L205 SmtUtils]: Spent 842.00 ms on a formula simplification. DAG size of input: 2125 DAG size of output: 15 [2021-07-13 19:28:16,548 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:28:16,549 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 15 treesize of output 18 [2021-07-13 19:28:16,554 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:28:16,559 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:28:16,559 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:28:16,560 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:15, output treesize:3 [2021-07-13 19:28:16,566 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:28:16,566 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1920662415] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:28:16,566 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:28:16,566 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 10 [2021-07-13 19:28:16,566 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1975531797] [2021-07-13 19:28:16,566 INFO L462 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-07-13 19:28:16,566 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:28:16,567 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-07-13 19:28:16,567 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-07-13 19:28:16,567 INFO L87 Difference]: Start difference. First operand 27 states and 49 transitions. Second operand has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 10 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:28:16,639 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:28:16,640 INFO L93 Difference]: Finished difference Result 37 states and 65 transitions. [2021-07-13 19:28:16,640 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-07-13 19:28:16,640 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 10 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-07-13 19:28:16,640 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:28:16,641 INFO L225 Difference]: With dead ends: 37 [2021-07-13 19:28:16,641 INFO L226 Difference]: Without dead ends: 29 [2021-07-13 19:28:16,641 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 270.3ms TimeCoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2021-07-13 19:28:16,641 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-07-13 19:28:16,643 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2021-07-13 19:28:16,643 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 28 states have (on average 1.9285714285714286) internal successors, (54), 28 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:28:16,644 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 54 transitions. [2021-07-13 19:28:16,644 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 54 transitions. Word has length 12 [2021-07-13 19:28:16,644 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:28:16,644 INFO L482 AbstractCegarLoop]: Abstraction has 29 states and 54 transitions. [2021-07-13 19:28:16,645 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 10 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:28:16,645 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 54 transitions. [2021-07-13 19:28:16,645 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-07-13 19:28:16,645 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:28:16,645 INFO L508 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:28:16,860 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:28:16,861 INFO L430 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-07-13 19:28:16,861 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:28:16,861 INFO L82 PathProgramCache]: Analyzing trace with hash 1755948505, now seen corresponding path program 5 times [2021-07-13 19:28:16,861 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:28:16,861 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1309843418] [2021-07-13 19:28:16,862 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:28:16,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:28:17,785 WARN L205 SmtUtils]: Spent 857.00 ms on a formula simplification. DAG size of input: 2941 DAG size of output: 54 [2021-07-13 19:28:17,933 WARN L205 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 54 DAG size of output: 29 [2021-07-13 19:28:19,558 WARN L205 SmtUtils]: Spent 1.57 s on a formula simplification. DAG size of input: 5612 DAG size of output: 47 [2021-07-13 19:28:19,659 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:28:19,659 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:28:19,659 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1309843418] [2021-07-13 19:28:19,659 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1309843418] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:28:19,659 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [994391469] [2021-07-13 19:28:19,659 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:28:19,702 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 19:28:19,703 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:28:19,703 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 20 conjunts are in the unsatisfiable core [2021-07-13 19:28:19,704 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:28:20,600 WARN L205 SmtUtils]: Spent 813.00 ms on a formula simplification. DAG size of input: 2127 DAG size of output: 32 [2021-07-13 19:28:20,635 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:28:20,635 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 37 [2021-07-13 19:28:20,643 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 3 xjuncts. [2021-07-13 19:28:20,695 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:28:20,695 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 7 new quantified variables, introduced 6 case distinctions, treesize of input 19 treesize of output 64 [2021-07-13 19:28:20,743 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 2 xjuncts. [2021-07-13 19:28:20,751 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:28:20,752 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 15 treesize of output 18 [2021-07-13 19:28:20,754 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-07-13 19:28:20,808 INFO L628 ElimStorePlain]: treesize reduction 28, result has 53.3 percent of original size [2021-07-13 19:28:20,812 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 3 xjuncts. [2021-07-13 19:28:20,812 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 1 variables, input treesize:85, output treesize:32 [2021-07-13 19:28:20,858 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:28:20,858 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [994391469] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:28:20,858 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:28:20,858 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 10 [2021-07-13 19:28:20,859 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1698989108] [2021-07-13 19:28:20,859 INFO L462 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-07-13 19:28:20,859 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:28:20,859 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-07-13 19:28:20,859 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2021-07-13 19:28:20,860 INFO L87 Difference]: Start difference. First operand 29 states and 54 transitions. Second operand has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 10 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:28:20,993 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:28:20,993 INFO L93 Difference]: Finished difference Result 43 states and 85 transitions. [2021-07-13 19:28:20,993 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-07-13 19:28:20,994 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 10 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-07-13 19:28:20,994 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:28:20,994 INFO L225 Difference]: With dead ends: 43 [2021-07-13 19:28:20,995 INFO L226 Difference]: Without dead ends: 38 [2021-07-13 19:28:20,995 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 323.1ms TimeCoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2021-07-13 19:28:20,995 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-07-13 19:28:20,997 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 29. [2021-07-13 19:28:20,997 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 28 states have (on average 1.9285714285714286) internal successors, (54), 28 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:28:21,000 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 54 transitions. [2021-07-13 19:28:21,000 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 54 transitions. Word has length 12 [2021-07-13 19:28:21,000 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:28:21,000 INFO L482 AbstractCegarLoop]: Abstraction has 29 states and 54 transitions. [2021-07-13 19:28:21,000 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 10 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:28:21,000 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 54 transitions. [2021-07-13 19:28:21,001 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-07-13 19:28:21,001 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:28:21,001 INFO L508 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:28:21,225 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2021-07-13 19:28:21,225 INFO L430 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-07-13 19:28:21,226 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:28:21,226 INFO L82 PathProgramCache]: Analyzing trace with hash -1687874659, now seen corresponding path program 6 times [2021-07-13 19:28:21,226 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:28:21,226 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2101854943] [2021-07-13 19:28:21,226 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:28:21,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:28:21,708 WARN L205 SmtUtils]: Spent 415.00 ms on a formula simplification. DAG size of input: 2846 DAG size of output: 46 [2021-07-13 19:28:21,827 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:28:21,827 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:28:21,827 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2101854943] [2021-07-13 19:28:21,827 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2101854943] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:28:21,827 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1408651508] [2021-07-13 19:28:21,827 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:28:21,850 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-07-13 19:28:21,850 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:28:21,850 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 20 conjunts are in the unsatisfiable core [2021-07-13 19:28:21,851 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:28:22,000 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:28:22,000 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 37 [2021-07-13 19:28:22,009 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 3 xjuncts. [2021-07-13 19:28:22,038 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:28:22,038 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 7 new quantified variables, introduced 6 case distinctions, treesize of input 19 treesize of output 64 [2021-07-13 19:28:22,062 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 2 xjuncts. [2021-07-13 19:28:22,069 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:28:22,070 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 15 treesize of output 18 [2021-07-13 19:28:22,072 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-07-13 19:28:22,122 INFO L628 ElimStorePlain]: treesize reduction 28, result has 53.3 percent of original size [2021-07-13 19:28:22,123 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 3 xjuncts. [2021-07-13 19:28:22,123 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 1 variables, input treesize:85, output treesize:32 [2021-07-13 19:28:22,168 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:28:22,168 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1408651508] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:28:22,168 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:28:22,168 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 10 [2021-07-13 19:28:22,168 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [666833890] [2021-07-13 19:28:22,169 INFO L462 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-07-13 19:28:22,169 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:28:22,169 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-07-13 19:28:22,169 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2021-07-13 19:28:22,169 INFO L87 Difference]: Start difference. First operand 29 states and 54 transitions. Second operand has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 10 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:28:22,382 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:28:22,382 INFO L93 Difference]: Finished difference Result 61 states and 110 transitions. [2021-07-13 19:28:22,383 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-07-13 19:28:22,383 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 10 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-07-13 19:28:22,383 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:28:22,383 INFO L225 Difference]: With dead ends: 61 [2021-07-13 19:28:22,383 INFO L226 Difference]: Without dead ends: 51 [2021-07-13 19:28:22,384 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 305.8ms TimeCoverageRelationStatistics Valid=53, Invalid=157, Unknown=0, NotChecked=0, Total=210 [2021-07-13 19:28:22,384 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-07-13 19:28:22,386 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 29. [2021-07-13 19:28:22,386 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 28 states have (on average 1.9285714285714286) internal successors, (54), 28 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:28:22,387 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 54 transitions. [2021-07-13 19:28:22,387 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 54 transitions. Word has length 12 [2021-07-13 19:28:22,387 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:28:22,387 INFO L482 AbstractCegarLoop]: Abstraction has 29 states and 54 transitions. [2021-07-13 19:28:22,387 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 10 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:28:22,387 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 54 transitions. [2021-07-13 19:28:22,387 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-07-13 19:28:22,388 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:28:22,388 INFO L508 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:28:22,600 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:28:22,601 INFO L430 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-07-13 19:28:22,601 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:28:22,601 INFO L82 PathProgramCache]: Analyzing trace with hash 1945828854, now seen corresponding path program 1 times [2021-07-13 19:28:22,601 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:28:22,601 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [657634807] [2021-07-13 19:28:22,601 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:28:22,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:28:22,623 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:28:22,624 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:28:22,624 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [657634807] [2021-07-13 19:28:22,624 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [657634807] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:28:22,624 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1781044346] [2021-07-13 19:28:22,624 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:28:22,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:28:22,649 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 4 conjunts are in the unsatisfiable core [2021-07-13 19:28:22,650 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:28:22,681 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:28:22,682 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1781044346] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:28:22,682 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:28:22,682 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2021-07-13 19:28:22,682 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1260844317] [2021-07-13 19:28:22,682 INFO L462 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-07-13 19:28:22,682 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:28:22,683 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-07-13 19:28:22,683 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-07-13 19:28:22,683 INFO L87 Difference]: Start difference. First operand 29 states and 54 transitions. Second operand has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:28:22,712 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:28:22,712 INFO L93 Difference]: Finished difference Result 59 states and 102 transitions. [2021-07-13 19:28:22,714 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-07-13 19:28:22,714 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-07-13 19:28:22,715 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:28:22,715 INFO L225 Difference]: With dead ends: 59 [2021-07-13 19:28:22,715 INFO L226 Difference]: Without dead ends: 59 [2021-07-13 19:28:22,715 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 10 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 19.2ms TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-07-13 19:28:22,716 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-07-13 19:28:22,718 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 30. [2021-07-13 19:28:22,718 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 29 states have (on average 2.0) internal successors, (58), 29 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:28:22,718 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 58 transitions. [2021-07-13 19:28:22,719 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 58 transitions. Word has length 12 [2021-07-13 19:28:22,719 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:28:22,719 INFO L482 AbstractCegarLoop]: Abstraction has 30 states and 58 transitions. [2021-07-13 19:28:22,719 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:28:22,719 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 58 transitions. [2021-07-13 19:28:22,719 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-07-13 19:28:22,719 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:28:22,720 INFO L508 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:28:22,936 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable75,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:28:22,937 INFO L430 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-07-13 19:28:22,937 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:28:22,937 INFO L82 PathProgramCache]: Analyzing trace with hash -115030948, now seen corresponding path program 2 times [2021-07-13 19:28:22,937 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:28:22,938 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1187436536] [2021-07-13 19:28:22,938 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:28:22,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:28:22,957 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:28:22,958 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:28:22,958 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1187436536] [2021-07-13 19:28:22,958 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1187436536] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:28:22,958 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [535354158] [2021-07-13 19:28:22,958 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:28:22,980 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 19:28:22,981 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:28:22,981 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 4 conjunts are in the unsatisfiable core [2021-07-13 19:28:22,981 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:28:23,004 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:28:23,004 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [535354158] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:28:23,005 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:28:23,005 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2021-07-13 19:28:23,005 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [265578882] [2021-07-13 19:28:23,005 INFO L462 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-07-13 19:28:23,005 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:28:23,006 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-07-13 19:28:23,006 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-07-13 19:28:23,006 INFO L87 Difference]: Start difference. First operand 30 states and 58 transitions. Second operand has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:28:23,049 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:28:23,049 INFO L93 Difference]: Finished difference Result 43 states and 82 transitions. [2021-07-13 19:28:23,050 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-07-13 19:28:23,050 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-07-13 19:28:23,050 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:28:23,050 INFO L225 Difference]: With dead ends: 43 [2021-07-13 19:28:23,051 INFO L226 Difference]: Without dead ends: 43 [2021-07-13 19:28:23,051 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 10 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 24.8ms TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-07-13 19:28:23,051 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-07-13 19:28:23,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 32. [2021-07-13 19:28:23,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 31 states have (on average 2.064516129032258) internal successors, (64), 31 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:28:23,053 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 64 transitions. [2021-07-13 19:28:23,054 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 64 transitions. Word has length 12 [2021-07-13 19:28:23,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:28:23,054 INFO L482 AbstractCegarLoop]: Abstraction has 32 states and 64 transitions. [2021-07-13 19:28:23,054 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:28:23,054 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 64 transitions. [2021-07-13 19:28:23,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-07-13 19:28:23,054 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:28:23,054 INFO L508 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:28:23,256 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable76 [2021-07-13 19:28:23,257 INFO L430 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-07-13 19:28:23,257 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:28:23,257 INFO L82 PathProgramCache]: Analyzing trace with hash 1264033467, now seen corresponding path program 7 times [2021-07-13 19:28:23,257 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:28:23,258 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [133638223] [2021-07-13 19:28:23,258 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:28:23,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:28:23,764 WARN L205 SmtUtils]: Spent 415.00 ms on a formula simplification. DAG size of input: 2845 DAG size of output: 42 [2021-07-13 19:28:24,602 WARN L205 SmtUtils]: Spent 736.00 ms on a formula simplification. DAG size of input: 5510 DAG size of output: 25 [2021-07-13 19:28:25,396 WARN L205 SmtUtils]: Spent 725.00 ms on a formula simplification. DAG size of input: 5508 DAG size of output: 14 [2021-07-13 19:28:25,414 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:28:25,414 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:28:25,414 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [133638223] [2021-07-13 19:28:25,414 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [133638223] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:28:25,414 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2085592387] [2021-07-13 19:28:25,414 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:28:25,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:28:25,437 WARN L261 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 24 conjunts are in the unsatisfiable core [2021-07-13 19:28:25,438 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:28:26,342 WARN L205 SmtUtils]: Spent 794.00 ms on a formula simplification. DAG size of input: 2125 DAG size of output: 16 [2021-07-13 19:28:26,357 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:28:26,357 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 3 case distinctions, treesize of input 19 treesize of output 37 [2021-07-13 19:28:26,367 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:28:26,369 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:28:26,369 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:28:26,369 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:19, output treesize:3 [2021-07-13 19:28:26,373 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:28:26,374 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2085592387] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:28:26,374 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:28:26,374 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2021-07-13 19:28:26,374 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1706288812] [2021-07-13 19:28:26,374 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-07-13 19:28:26,374 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:28:26,375 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-07-13 19:28:26,375 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=126, Unknown=0, NotChecked=0, Total=156 [2021-07-13 19:28:26,375 INFO L87 Difference]: Start difference. First operand 32 states and 64 transitions. Second operand has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:28:26,467 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:28:26,467 INFO L93 Difference]: Finished difference Result 42 states and 80 transitions. [2021-07-13 19:28:26,468 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-07-13 19:28:26,468 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2021-07-13 19:28:26,468 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:28:26,468 INFO L225 Difference]: With dead ends: 42 [2021-07-13 19:28:26,468 INFO L226 Difference]: Without dead ends: 34 [2021-07-13 19:28:26,469 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 224.3ms TimeCoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2021-07-13 19:28:26,469 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-07-13 19:28:26,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2021-07-13 19:28:26,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 33 states have (on average 2.090909090909091) internal successors, (69), 33 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:28:26,471 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 69 transitions. [2021-07-13 19:28:26,472 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 69 transitions. Word has length 13 [2021-07-13 19:28:26,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:28:26,472 INFO L482 AbstractCegarLoop]: Abstraction has 34 states and 69 transitions. [2021-07-13 19:28:26,472 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:28:26,472 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 69 transitions. [2021-07-13 19:28:26,472 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-07-13 19:28:26,472 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:28:26,473 INFO L508 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:28:26,677 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable77,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:28:26,677 INFO L430 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-07-13 19:28:26,678 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:28:26,678 INFO L82 PathProgramCache]: Analyzing trace with hash 2007616827, now seen corresponding path program 8 times [2021-07-13 19:28:26,678 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:28:26,678 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [339061867] [2021-07-13 19:28:26,678 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:28:26,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:28:27,180 WARN L205 SmtUtils]: Spent 396.00 ms on a formula simplification. DAG size of input: 2845 DAG size of output: 42 [2021-07-13 19:28:28,010 WARN L205 SmtUtils]: Spent 735.00 ms on a formula simplification. DAG size of input: 5510 DAG size of output: 25 [2021-07-13 19:28:28,108 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:28:28,108 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:28:28,108 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [339061867] [2021-07-13 19:28:28,109 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [339061867] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:28:28,109 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [276475533] [2021-07-13 19:28:28,109 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 [2021-07-13 19:28:28,132 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-13 19:28:28,132 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:28:28,133 WARN L261 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 24 conjunts are in the unsatisfiable core [2021-07-13 19:28:28,134 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:28:29,017 WARN L205 SmtUtils]: Spent 790.00 ms on a formula simplification. DAG size of input: 2127 DAG size of output: 25 [2021-07-13 19:28:29,048 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:28:29,048 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 3 case distinctions, treesize of input 19 treesize of output 37 [2021-07-13 19:28:29,059 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:28:29,082 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:28:29,083 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 7 new quantified variables, introduced 6 case distinctions, treesize of input 21 treesize of output 64 [2021-07-13 19:28:29,106 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 3 xjuncts. [2021-07-13 19:28:29,127 INFO L628 ElimStorePlain]: treesize reduction 18, result has 50.0 percent of original size [2021-07-13 19:28:29,127 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-07-13 19:28:29,127 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:59, output treesize:18 [2021-07-13 19:28:29,160 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:28:29,161 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [276475533] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:28:29,161 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:28:29,161 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2021-07-13 19:28:29,161 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [166165461] [2021-07-13 19:28:29,161 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-07-13 19:28:29,161 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:28:29,162 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-07-13 19:28:29,162 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2021-07-13 19:28:29,162 INFO L87 Difference]: Start difference. First operand 34 states and 69 transitions. Second operand has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:28:29,284 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:28:29,284 INFO L93 Difference]: Finished difference Result 48 states and 97 transitions. [2021-07-13 19:28:29,285 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-07-13 19:28:29,285 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2021-07-13 19:28:29,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:28:29,285 INFO L225 Difference]: With dead ends: 48 [2021-07-13 19:28:29,285 INFO L226 Difference]: Without dead ends: 43 [2021-07-13 19:28:29,286 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 269.9ms TimeCoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2021-07-13 19:28:29,286 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-07-13 19:28:29,287 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 34. [2021-07-13 19:28:29,288 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 33 states have (on average 2.090909090909091) internal successors, (69), 33 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:28:29,288 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 69 transitions. [2021-07-13 19:28:29,288 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 69 transitions. Word has length 13 [2021-07-13 19:28:29,288 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:28:29,288 INFO L482 AbstractCegarLoop]: Abstraction has 34 states and 69 transitions. [2021-07-13 19:28:29,288 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:28:29,288 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 69 transitions. [2021-07-13 19:28:29,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-07-13 19:28:29,289 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:28:29,289 INFO L508 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:28:29,489 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable81,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:28:29,490 INFO L430 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-07-13 19:28:29,490 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:28:29,490 INFO L82 PathProgramCache]: Analyzing trace with hash -1436206337, now seen corresponding path program 9 times [2021-07-13 19:28:29,491 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:28:29,491 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [580833139] [2021-07-13 19:28:29,491 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:28:29,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:28:30,020 WARN L205 SmtUtils]: Spent 434.00 ms on a formula simplification. DAG size of input: 2845 DAG size of output: 42 [2021-07-13 19:28:30,123 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:28:30,124 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:28:30,124 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [580833139] [2021-07-13 19:28:30,124 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [580833139] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:28:30,124 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [995677842] [2021-07-13 19:28:30,124 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 [2021-07-13 19:28:30,152 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-07-13 19:28:30,152 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:28:30,152 WARN L261 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 24 conjunts are in the unsatisfiable core [2021-07-13 19:28:30,153 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:28:31,013 WARN L205 SmtUtils]: Spent 805.00 ms on a formula simplification. DAG size of input: 1384 DAG size of output: 45 [2021-07-13 19:28:31,097 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:28:31,098 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 3 case distinctions, treesize of input 19 treesize of output 37 [2021-07-13 19:28:31,106 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:28:31,127 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:28:31,127 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 7 new quantified variables, introduced 6 case distinctions, treesize of input 21 treesize of output 64 [2021-07-13 19:28:31,145 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 3 xjuncts. [2021-07-13 19:28:31,167 INFO L628 ElimStorePlain]: treesize reduction 18, result has 50.0 percent of original size [2021-07-13 19:28:31,167 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-07-13 19:28:31,168 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:59, output treesize:18 [2021-07-13 19:28:31,201 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:28:31,201 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [995677842] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:28:31,201 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:28:31,201 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2021-07-13 19:28:31,202 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [184015456] [2021-07-13 19:28:31,202 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-07-13 19:28:31,202 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:28:31,202 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-07-13 19:28:31,202 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2021-07-13 19:28:31,203 INFO L87 Difference]: Start difference. First operand 34 states and 69 transitions. Second operand has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:28:31,362 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:28:31,362 INFO L93 Difference]: Finished difference Result 73 states and 141 transitions. [2021-07-13 19:28:31,362 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-07-13 19:28:31,362 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2021-07-13 19:28:31,363 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:28:31,363 INFO L225 Difference]: With dead ends: 73 [2021-07-13 19:28:31,363 INFO L226 Difference]: Without dead ends: 63 [2021-07-13 19:28:31,363 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 324.5ms TimeCoverageRelationStatistics Valid=58, Invalid=214, Unknown=0, NotChecked=0, Total=272 [2021-07-13 19:28:31,363 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-07-13 19:28:31,365 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 34. [2021-07-13 19:28:31,365 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 33 states have (on average 2.090909090909091) internal successors, (69), 33 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:28:31,366 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 69 transitions. [2021-07-13 19:28:31,366 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 69 transitions. Word has length 13 [2021-07-13 19:28:31,366 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:28:31,366 INFO L482 AbstractCegarLoop]: Abstraction has 34 states and 69 transitions. [2021-07-13 19:28:31,366 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:28:31,366 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 69 transitions. [2021-07-13 19:28:31,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-07-13 19:28:31,367 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:28:31,367 INFO L508 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:28:31,576 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable96 [2021-07-13 19:28:31,577 INFO L430 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-07-13 19:28:31,577 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:28:31,577 INFO L82 PathProgramCache]: Analyzing trace with hash -2097470120, now seen corresponding path program 3 times [2021-07-13 19:28:31,577 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:28:31,577 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1343081360] [2021-07-13 19:28:31,577 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:28:31,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:28:31,605 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:28:31,606 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:28:31,606 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1343081360] [2021-07-13 19:28:31,606 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1343081360] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:28:31,606 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1934222927] [2021-07-13 19:28:31,606 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:28:31,636 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-07-13 19:28:31,636 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:28:31,637 INFO L263 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 5 conjunts are in the unsatisfiable core [2021-07-13 19:28:31,637 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:28:31,667 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:28:31,667 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1934222927] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:28:31,667 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:28:31,667 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2021-07-13 19:28:31,668 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [621937286] [2021-07-13 19:28:31,668 INFO L462 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-07-13 19:28:31,668 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:28:31,668 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-07-13 19:28:31,668 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-07-13 19:28:31,669 INFO L87 Difference]: Start difference. First operand 34 states and 69 transitions. Second operand has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 6 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:28:31,719 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:28:31,720 INFO L93 Difference]: Finished difference Result 86 states and 153 transitions. [2021-07-13 19:28:31,720 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-07-13 19:28:31,720 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 6 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2021-07-13 19:28:31,720 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:28:31,721 INFO L225 Difference]: With dead ends: 86 [2021-07-13 19:28:31,721 INFO L226 Difference]: Without dead ends: 86 [2021-07-13 19:28:31,721 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 11 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 24.8ms TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-07-13 19:28:31,721 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2021-07-13 19:28:31,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 35. [2021-07-13 19:28:31,724 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 2.1470588235294117) internal successors, (73), 34 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:28:31,724 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 73 transitions. [2021-07-13 19:28:31,724 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 73 transitions. Word has length 13 [2021-07-13 19:28:31,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:28:31,724 INFO L482 AbstractCegarLoop]: Abstraction has 35 states and 73 transitions. [2021-07-13 19:28:31,724 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 6 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:28:31,724 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 73 transitions. [2021-07-13 19:28:31,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-07-13 19:28:31,725 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:28:31,725 INFO L508 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:28:31,940 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable111 [2021-07-13 19:28:31,941 INFO L430 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-07-13 19:28:31,941 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:28:31,941 INFO L82 PathProgramCache]: Analyzing trace with hash 136637374, now seen corresponding path program 4 times [2021-07-13 19:28:31,941 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:28:31,941 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [350620093] [2021-07-13 19:28:31,942 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:28:31,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:28:31,967 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:28:31,967 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:28:31,967 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [350620093] [2021-07-13 19:28:31,967 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [350620093] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:28:31,967 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1828091590] [2021-07-13 19:28:31,967 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:28:31,990 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-07-13 19:28:31,991 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:28:31,991 INFO L263 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 5 conjunts are in the unsatisfiable core [2021-07-13 19:28:31,991 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:28:32,025 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:28:32,025 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1828091590] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:28:32,025 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:28:32,025 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2021-07-13 19:28:32,026 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1692858146] [2021-07-13 19:28:32,026 INFO L462 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-07-13 19:28:32,026 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:28:32,026 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-07-13 19:28:32,026 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-07-13 19:28:32,027 INFO L87 Difference]: Start difference. First operand 35 states and 73 transitions. Second operand has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 6 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:28:32,083 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:28:32,083 INFO L93 Difference]: Finished difference Result 64 states and 118 transitions. [2021-07-13 19:28:32,083 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-07-13 19:28:32,084 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 6 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2021-07-13 19:28:32,084 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:28:32,084 INFO L225 Difference]: With dead ends: 64 [2021-07-13 19:28:32,084 INFO L226 Difference]: Without dead ends: 64 [2021-07-13 19:28:32,084 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 11 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 39.0ms TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2021-07-13 19:28:32,085 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-07-13 19:28:32,086 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 35. [2021-07-13 19:28:32,086 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 2.1470588235294117) internal successors, (73), 34 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:28:32,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 73 transitions. [2021-07-13 19:28:32,087 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 73 transitions. Word has length 13 [2021-07-13 19:28:32,087 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:28:32,087 INFO L482 AbstractCegarLoop]: Abstraction has 35 states and 73 transitions. [2021-07-13 19:28:32,087 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 6 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:28:32,087 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 73 transitions. [2021-07-13 19:28:32,087 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-07-13 19:28:32,087 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:28:32,088 INFO L508 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:28:32,288 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable112 [2021-07-13 19:28:32,289 INFO L430 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-07-13 19:28:32,289 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:28:32,289 INFO L82 PathProgramCache]: Analyzing trace with hash 1085182591, now seen corresponding path program 10 times [2021-07-13 19:28:32,289 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:28:32,289 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [792606469] [2021-07-13 19:28:32,289 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:28:32,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:28:32,373 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:28:32,373 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:28:32,373 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [792606469] [2021-07-13 19:28:32,373 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [792606469] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:28:32,373 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1782579934] [2021-07-13 19:28:32,374 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:28:32,400 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-07-13 19:28:32,400 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:28:32,400 WARN L261 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 24 conjunts are in the unsatisfiable core [2021-07-13 19:28:32,401 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:31:54,929 WARN L205 SmtUtils]: Spent 3.36 m on a formula simplification. DAG size of input: 112621 DAG size of output: 44 [2021-07-13 19:31:55,101 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:31:55,101 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 3 case distinctions, treesize of input 19 treesize of output 37 [2021-07-13 19:31:55,113 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:31:55,136 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:31:55,136 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 7 new quantified variables, introduced 6 case distinctions, treesize of input 21 treesize of output 64 [2021-07-13 19:31:55,186 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 3 xjuncts. [2021-07-13 19:31:55,209 INFO L628 ElimStorePlain]: treesize reduction 18, result has 50.0 percent of original size [2021-07-13 19:31:55,210 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-07-13 19:31:55,210 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:59, output treesize:18 [2021-07-13 19:31:55,242 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:31:55,242 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1782579934] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:31:55,242 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:31:55,242 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2021-07-13 19:31:55,242 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1214417802] [2021-07-13 19:31:55,243 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-07-13 19:31:55,243 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:31:55,243 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-07-13 19:31:55,244 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=117, Unknown=0, NotChecked=0, Total=156 [2021-07-13 19:31:55,244 INFO L87 Difference]: Start difference. First operand 35 states and 73 transitions. Second operand has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:31:55,600 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:31:55,600 INFO L93 Difference]: Finished difference Result 79 states and 145 transitions. [2021-07-13 19:31:55,601 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-07-13 19:31:55,601 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2021-07-13 19:31:55,601 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:31:55,601 INFO L225 Difference]: With dead ends: 79 [2021-07-13 19:31:55,601 INFO L226 Difference]: Without dead ends: 69 [2021-07-13 19:31:55,602 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 466.9ms TimeCoverageRelationStatistics Valid=117, Invalid=345, Unknown=0, NotChecked=0, Total=462 [2021-07-13 19:31:55,602 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2021-07-13 19:31:55,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 39. [2021-07-13 19:31:55,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 38 states have (on average 2.0789473684210527) internal successors, (79), 38 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:31:55,604 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 79 transitions. [2021-07-13 19:31:55,604 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 79 transitions. Word has length 13 [2021-07-13 19:31:55,604 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:31:55,604 INFO L482 AbstractCegarLoop]: Abstraction has 39 states and 79 transitions. [2021-07-13 19:31:55,604 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:31:55,604 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 79 transitions. [2021-07-13 19:31:55,605 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-07-13 19:31:55,605 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:31:55,605 INFO L508 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:31:55,820 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable113,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:31:55,821 INFO L430 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-07-13 19:31:55,821 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:31:55,821 INFO L82 PathProgramCache]: Analyzing trace with hash 674492952, now seen corresponding path program 5 times [2021-07-13 19:31:55,821 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:31:55,821 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [934463427] [2021-07-13 19:31:55,821 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:31:55,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:31:55,844 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:31:55,845 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:31:55,845 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [934463427] [2021-07-13 19:31:55,845 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [934463427] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:31:55,845 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1842908026] [2021-07-13 19:31:55,845 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:31:55,870 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-07-13 19:31:55,871 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:31:55,871 INFO L263 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 5 conjunts are in the unsatisfiable core [2021-07-13 19:31:55,872 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:31:55,909 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:31:55,909 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1842908026] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:31:55,909 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:31:55,909 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2021-07-13 19:31:55,910 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1521592531] [2021-07-13 19:31:55,910 INFO L462 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-07-13 19:31:55,910 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:31:55,910 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-07-13 19:31:55,910 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-07-13 19:31:55,910 INFO L87 Difference]: Start difference. First operand 39 states and 79 transitions. Second operand has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 6 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:31:55,958 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:31:55,958 INFO L93 Difference]: Finished difference Result 64 states and 127 transitions. [2021-07-13 19:31:55,958 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-07-13 19:31:55,958 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 6 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2021-07-13 19:31:55,958 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:31:55,960 INFO L225 Difference]: With dead ends: 64 [2021-07-13 19:31:55,960 INFO L226 Difference]: Without dead ends: 64 [2021-07-13 19:31:55,960 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 11 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 34.5ms TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2021-07-13 19:31:55,960 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-07-13 19:31:55,965 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 42. [2021-07-13 19:31:55,965 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 41 states have (on average 2.1463414634146343) internal successors, (88), 41 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:31:55,966 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 88 transitions. [2021-07-13 19:31:55,966 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 88 transitions. Word has length 13 [2021-07-13 19:31:55,966 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:31:55,966 INFO L482 AbstractCegarLoop]: Abstraction has 42 states and 88 transitions. [2021-07-13 19:31:55,966 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 6 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:31:55,966 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 88 transitions. [2021-07-13 19:31:55,967 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-07-13 19:31:55,967 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:31:55,967 INFO L508 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:31:56,180 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable133 [2021-07-13 19:31:56,181 INFO L430 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-07-13 19:31:56,181 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:31:56,181 INFO L82 PathProgramCache]: Analyzing trace with hash 475816857, now seen corresponding path program 11 times [2021-07-13 19:31:56,181 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:31:56,181 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [846811138] [2021-07-13 19:31:56,181 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:31:56,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:31:56,677 WARN L205 SmtUtils]: Spent 413.00 ms on a formula simplification. DAG size of input: 2844 DAG size of output: 41 [2021-07-13 19:31:57,493 WARN L205 SmtUtils]: Spent 737.00 ms on a formula simplification. DAG size of input: 5510 DAG size of output: 14 [2021-07-13 19:31:57,508 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:31:57,509 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:31:57,509 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [846811138] [2021-07-13 19:31:57,509 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [846811138] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:31:57,509 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [464634487] [2021-07-13 19:31:57,509 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2021-07-13 19:31:57,558 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-07-13 19:31:57,558 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:31:57,559 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 22 conjunts are in the unsatisfiable core [2021-07-13 19:31:57,559 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:33:35,780 WARN L205 SmtUtils]: Spent 1.63 m on a formula simplification. DAG size of input: 7792 DAG size of output: 48 [2021-07-13 19:33:35,849 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:33:35,850 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 7 new quantified variables, introduced 6 case distinctions, treesize of input 23 treesize of output 64 [2021-07-13 19:33:35,883 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:33:35,885 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:33:35,885 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:33:35,886 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:23, output treesize:3 [2021-07-13 19:33:35,891 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:33:35,891 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [464634487] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:33:35,891 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:33:35,891 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2021-07-13 19:33:35,891 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1748027320] [2021-07-13 19:33:35,891 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-07-13 19:33:35,891 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:33:35,892 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-07-13 19:33:35,892 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=127, Unknown=0, NotChecked=0, Total=156 [2021-07-13 19:33:35,892 INFO L87 Difference]: Start difference. First operand 42 states and 88 transitions. Second operand has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 12 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:33:36,008 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:33:36,008 INFO L93 Difference]: Finished difference Result 54 states and 111 transitions. [2021-07-13 19:33:36,009 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-07-13 19:33:36,009 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 12 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2021-07-13 19:33:36,009 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:33:36,009 INFO L225 Difference]: With dead ends: 54 [2021-07-13 19:33:36,009 INFO L226 Difference]: Without dead ends: 49 [2021-07-13 19:33:36,010 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 195.6ms TimeCoverageRelationStatistics Valid=34, Invalid=148, Unknown=0, NotChecked=0, Total=182 [2021-07-13 19:33:36,010 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-07-13 19:33:36,011 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 47. [2021-07-13 19:33:36,012 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 46 states have (on average 2.152173913043478) internal successors, (99), 46 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:33:36,012 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 99 transitions. [2021-07-13 19:33:36,012 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 99 transitions. Word has length 14 [2021-07-13 19:33:36,013 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:33:36,013 INFO L482 AbstractCegarLoop]: Abstraction has 47 states and 99 transitions. [2021-07-13 19:33:36,013 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 12 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:33:36,013 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 99 transitions. [2021-07-13 19:33:36,013 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-07-13 19:33:36,013 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:33:36,014 INFO L508 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:33:36,228 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable134 [2021-07-13 19:33:36,229 INFO L430 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-07-13 19:33:36,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:33:36,229 INFO L82 PathProgramCache]: Analyzing trace with hash 2070544349, now seen corresponding path program 12 times [2021-07-13 19:33:36,229 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:33:36,229 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1999143943] [2021-07-13 19:33:36,229 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:33:36,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:33:36,710 WARN L205 SmtUtils]: Spent 388.00 ms on a formula simplification. DAG size of input: 2844 DAG size of output: 41 [2021-07-13 19:33:36,776 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:33:36,776 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:33:36,777 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1999143943] [2021-07-13 19:33:36,777 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1999143943] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:33:36,777 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1596540241] [2021-07-13 19:33:36,777 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2021-07-13 19:33:36,799 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-07-13 19:33:36,800 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:33:36,800 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 22 conjunts are in the unsatisfiable core [2021-07-13 19:33:36,801 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:33:36,947 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:33:36,948 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 7 new quantified variables, introduced 6 case distinctions, treesize of input 23 treesize of output 64 [2021-07-13 19:33:36,977 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-07-13 19:33:36,979 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-07-13 19:33:36,979 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-07-13 19:33:36,979 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:23, output treesize:3 [2021-07-13 19:33:36,985 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:33:36,985 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1596540241] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:33:36,986 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:33:36,986 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2021-07-13 19:33:36,986 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1681436153] [2021-07-13 19:33:36,986 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-07-13 19:33:36,986 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:33:36,986 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-07-13 19:33:36,987 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=127, Unknown=0, NotChecked=0, Total=156 [2021-07-13 19:33:36,987 INFO L87 Difference]: Start difference. First operand 47 states and 99 transitions. Second operand has 13 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:33:37,119 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:33:37,120 INFO L93 Difference]: Finished difference Result 65 states and 124 transitions. [2021-07-13 19:33:37,120 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-07-13 19:33:37,120 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2021-07-13 19:33:37,122 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:33:37,122 INFO L225 Difference]: With dead ends: 65 [2021-07-13 19:33:37,122 INFO L226 Difference]: Without dead ends: 60 [2021-07-13 19:33:37,123 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 213.7ms TimeCoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2021-07-13 19:33:37,123 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-07-13 19:33:37,128 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 47. [2021-07-13 19:33:37,128 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 46 states have (on average 2.152173913043478) internal successors, (99), 46 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:33:37,129 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 99 transitions. [2021-07-13 19:33:37,129 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 99 transitions. Word has length 14 [2021-07-13 19:33:37,130 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:33:37,130 INFO L482 AbstractCegarLoop]: Abstraction has 47 states and 99 transitions. [2021-07-13 19:33:37,130 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:33:37,130 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 99 transitions. [2021-07-13 19:33:37,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-07-13 19:33:37,133 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:33:37,134 INFO L508 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:33:37,351 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable153,18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:33:37,351 INFO L430 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-07-13 19:33:37,351 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:33:37,352 INFO L82 PathProgramCache]: Analyzing trace with hash 1409280566, now seen corresponding path program 6 times [2021-07-13 19:33:37,352 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:33:37,352 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1991590351] [2021-07-13 19:33:37,352 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:33:37,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:33:37,398 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:33:37,398 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:33:37,398 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1991590351] [2021-07-13 19:33:37,398 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1991590351] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:33:37,398 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [537591794] [2021-07-13 19:33:37,398 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:33:37,433 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-07-13 19:33:37,433 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-13 19:33:37,434 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 6 conjunts are in the unsatisfiable core [2021-07-13 19:33:37,436 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:33:37,467 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:33:37,468 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [537591794] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:33:37,468 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:33:37,468 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2021-07-13 19:33:37,468 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1837529218] [2021-07-13 19:33:37,470 INFO L462 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-07-13 19:33:37,470 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:33:37,470 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-07-13 19:33:37,470 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-07-13 19:33:37,470 INFO L87 Difference]: Start difference. First operand 47 states and 99 transitions. Second operand has 8 states, 8 states have (on average 2.25) internal successors, (18), 7 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:33:37,519 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:33:37,519 INFO L93 Difference]: Finished difference Result 113 states and 207 transitions. [2021-07-13 19:33:37,519 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-07-13 19:33:37,519 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.25) internal successors, (18), 7 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2021-07-13 19:33:37,519 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:33:37,520 INFO L225 Difference]: With dead ends: 113 [2021-07-13 19:33:37,520 INFO L226 Difference]: Without dead ends: 113 [2021-07-13 19:33:37,520 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 12 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 40.5ms TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-07-13 19:33:37,521 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2021-07-13 19:33:37,525 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 48. [2021-07-13 19:33:37,525 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 47 states have (on average 2.1914893617021276) internal successors, (103), 47 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:33:37,526 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 103 transitions. [2021-07-13 19:33:37,526 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 103 transitions. Word has length 14 [2021-07-13 19:33:37,526 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:33:37,526 INFO L482 AbstractCegarLoop]: Abstraction has 48 states and 103 transitions. [2021-07-13 19:33:37,526 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 2.25) internal successors, (18), 7 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:33:37,526 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 103 transitions. [2021-07-13 19:33:37,531 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-07-13 19:33:37,531 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:33:37,531 INFO L508 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:33:37,744 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable169 [2021-07-13 19:33:37,745 INFO L430 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-07-13 19:33:37,745 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:33:37,745 INFO L82 PathProgramCache]: Analyzing trace with hash -651579236, now seen corresponding path program 7 times [2021-07-13 19:33:37,745 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:33:37,745 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [850849067] [2021-07-13 19:33:37,745 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:33:37,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:33:37,778 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:33:37,778 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:33:37,778 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [850849067] [2021-07-13 19:33:37,778 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [850849067] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:33:37,778 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [547808776] [2021-07-13 19:33:37,778 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:33:37,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:33:37,802 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 6 conjunts are in the unsatisfiable core [2021-07-13 19:33:37,802 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-13 19:33:37,833 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:33:37,833 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [547808776] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:33:37,833 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-13 19:33:37,833 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2021-07-13 19:33:37,833 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [327097873] [2021-07-13 19:33:37,833 INFO L462 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-07-13 19:33:37,833 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-13 19:33:37,834 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-07-13 19:33:37,834 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2021-07-13 19:33:37,834 INFO L87 Difference]: Start difference. First operand 48 states and 103 transitions. Second operand has 8 states, 8 states have (on average 2.25) internal successors, (18), 7 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:33:37,901 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-13 19:33:37,901 INFO L93 Difference]: Finished difference Result 106 states and 193 transitions. [2021-07-13 19:33:37,902 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-07-13 19:33:37,902 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.25) internal successors, (18), 7 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2021-07-13 19:33:37,902 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-13 19:33:37,902 INFO L225 Difference]: With dead ends: 106 [2021-07-13 19:33:37,902 INFO L226 Difference]: Without dead ends: 106 [2021-07-13 19:33:37,903 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 12 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 41.6ms TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2021-07-13 19:33:37,903 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2021-07-13 19:33:37,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 49. [2021-07-13 19:33:37,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 48 states have (on average 2.2291666666666665) internal successors, (107), 48 states have internal predecessors, (107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:33:37,905 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 107 transitions. [2021-07-13 19:33:37,905 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 107 transitions. Word has length 14 [2021-07-13 19:33:37,905 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-13 19:33:37,905 INFO L482 AbstractCegarLoop]: Abstraction has 49 states and 107 transitions. [2021-07-13 19:33:37,905 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 2.25) internal successors, (18), 7 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-13 19:33:37,905 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 107 transitions. [2021-07-13 19:33:37,905 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-07-13 19:33:37,905 INFO L500 BasicCegarLoop]: Found error trace [2021-07-13 19:33:37,905 INFO L508 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-13 19:33:38,106 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable170,20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-13 19:33:38,106 INFO L430 AbstractCegarLoop]: === Iteration 23 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-07-13 19:33:38,106 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-13 19:33:38,106 INFO L82 PathProgramCache]: Analyzing trace with hash 296965981, now seen corresponding path program 13 times [2021-07-13 19:33:38,107 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-13 19:33:38,107 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1349689620] [2021-07-13 19:33:38,107 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-13 19:33:38,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:33:38,172 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-13 19:33:38,172 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-13 19:33:38,173 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1349689620] [2021-07-13 19:33:38,173 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1349689620] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-13 19:33:38,173 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1005775084] [2021-07-13 19:33:38,173 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2021-07-13 19:33:38,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-13 19:33:38,195 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 22 conjunts are in the unsatisfiable core [2021-07-13 19:33:38,196 INFO L286 TraceCheckSpWp]: Computing forward predicates... Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown