/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/popl20/figure1-alt.wvr.bpl -------------------------------------------------------------------------------- This is Ultimate 0.2.1-9e34d99ae2c6837f487980c721c4b6acf9d9b15c-9e34d99 [2021-07-09 17:56:34,792 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-07-09 17:56:34,796 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-07-09 17:56:34,856 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-07-09 17:56:34,964 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 [2021-07-09 17:56:35,047 INFO L113 SettingsManager]: Loading preferences was successful [2021-07-09 17:56:35,047 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-07-09 17:56:35,048 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-07-09 17:56:35,048 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-07-09 17:56:35,051 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-07-09 17:56:35,051 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-07-09 17:56:35,051 INFO L138 SettingsManager]: * Use SBE=true [2021-07-09 17:56:35,051 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-07-09 17:56:35,052 INFO L138 SettingsManager]: * sizeof long=4 [2021-07-09 17:56:35,052 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-07-09 17:56:35,053 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-07-09 17:56:35,053 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-07-09 17:56:35,053 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-07-09 17:56:35,053 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-07-09 17:56:35,053 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-07-09 17:56:35,053 INFO L138 SettingsManager]: * sizeof long double=12 [2021-07-09 17:56:35,054 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-07-09 17:56:35,054 INFO L138 SettingsManager]: * Use constant arrays=true [2021-07-09 17:56:35,054 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-07-09 17:56:35,054 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-07-09 17:56:35,054 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-07-09 17:56:35,054 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-07-09 17:56:35,054 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-07-09 17:56:35,055 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-07-09 17:56:35,055 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-07-09 17:56:35,055 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-07-09 17:56:35,055 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-07-09 17:56:35,055 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-07-09 17:56:35,055 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-07-09 17:56:35,056 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-07-09 17:56:35,056 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-07-09 17:56:35,056 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-07-09 17:56:35,675 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-07-09 17:56:35,723 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-07-09 17:56:35,725 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-07-09 17:56:35,726 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2021-07-09 17:56:35,734 INFO L275 PluginConnector]: Boogie PL CUP Parser initialized [2021-07-09 17:56:35,735 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/weaver-benchmarks/generated/popl20/figure1-alt.wvr.bpl [2021-07-09 17:56:35,735 INFO L110 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/weaver-benchmarks/generated/popl20/figure1-alt.wvr.bpl' [2021-07-09 17:56:36,106 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-07-09 17:56:36,125 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-07-09 17:56:36,127 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-07-09 17:56:36,127 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-07-09 17:56:36,127 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-07-09 17:56:36,155 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "figure1-alt.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 09.07 05:56:36" (1/1) ... [2021-07-09 17:56:36,163 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "figure1-alt.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 09.07 05:56:36" (1/1) ... [2021-07-09 17:56:36,175 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-07-09 17:56:36,183 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-07-09 17:56:36,183 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-07-09 17:56:36,183 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-07-09 17:56:36,191 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "figure1-alt.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 09.07 05:56:36" (1/1) ... [2021-07-09 17:56:36,191 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "figure1-alt.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 09.07 05:56:36" (1/1) ... [2021-07-09 17:56:36,192 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "figure1-alt.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 09.07 05:56:36" (1/1) ... [2021-07-09 17:56:36,192 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "figure1-alt.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 09.07 05:56:36" (1/1) ... [2021-07-09 17:56:36,198 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "figure1-alt.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 09.07 05:56:36" (1/1) ... [2021-07-09 17:56:36,202 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "figure1-alt.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 09.07 05:56:36" (1/1) ... [2021-07-09 17:56:36,203 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "figure1-alt.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 09.07 05:56:36" (1/1) ... [2021-07-09 17:56:36,204 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-07-09 17:56:36,218 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-07-09 17:56:36,219 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-07-09 17:56:36,219 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-07-09 17:56:36,222 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "figure1-alt.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 09.07 05:56:36" (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 [2021-07-09 17:56:36,328 INFO L124 BoogieDeclarations]: Specification and implementation of procedure thread1 given in one single declaration [2021-07-09 17:56:36,328 INFO L130 BoogieDeclarations]: Found specification of procedure thread1 [2021-07-09 17:56:36,328 INFO L138 BoogieDeclarations]: Found implementation of procedure thread1 [2021-07-09 17:56:36,328 INFO L124 BoogieDeclarations]: Specification and implementation of procedure thread2 given in one single declaration [2021-07-09 17:56:36,328 INFO L130 BoogieDeclarations]: Found specification of procedure thread2 [2021-07-09 17:56:36,328 INFO L138 BoogieDeclarations]: Found implementation of procedure thread2 [2021-07-09 17:56:36,329 INFO L124 BoogieDeclarations]: Specification and implementation of procedure ULTIMATE.start given in one single declaration [2021-07-09 17:56:36,329 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-07-09 17:56:36,329 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-07-09 17:56:36,341 WARN L209 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to SingleStatement [2021-07-09 17:56:36,627 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-07-09 17:56:36,627 INFO L299 CfgBuilder]: Removed 0 assume(true) statements. [2021-07-09 17:56:36,644 INFO L202 PluginConnector]: Adding new model figure1-alt.wvr.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.07 05:56:36 BoogieIcfgContainer [2021-07-09 17:56:36,645 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-07-09 17:56:36,646 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-07-09 17:56:36,646 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-07-09 17:56:36,649 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-07-09 17:56:36,649 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "figure1-alt.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 09.07 05:56:36" (1/2) ... [2021-07-09 17:56:36,650 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6263487a and model type figure1-alt.wvr.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.07 05:56:36, skipping insertion in model container [2021-07-09 17:56:36,650 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "figure1-alt.wvr.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.07 05:56:36" (2/2) ... [2021-07-09 17:56:36,651 INFO L111 eAbstractionObserver]: Analyzing ICFG figure1-alt.wvr.bpl [2021-07-09 17:56:36,656 WARN L148 ceAbstractionStarter]: Switching off computation of Hoare annotation because input is a concurrent program [2021-07-09 17:56:36,656 INFO L214 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-07-09 17:56:36,656 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-07-09 17:56:36,677 INFO L474 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2021-07-09 17:56:36,701 INFO L149 ThreadInstanceAdder]: Constructed 2 joinOtherThreadTransitions. [2021-07-09 17:56:36,719 INFO L255 AbstractCegarLoop]: Starting to check reachability of 3 error locations. [2021-07-09 17:56:36,734 INFO L378 AbstractCegarLoop]: Interprodecural is true [2021-07-09 17:56:36,735 INFO L379 AbstractCegarLoop]: Hoare is false [2021-07-09 17:56:36,735 INFO L380 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-07-09 17:56:36,735 INFO L381 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-07-09 17:56:36,735 INFO L382 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-07-09 17:56:36,735 INFO L383 AbstractCegarLoop]: Difference is false [2021-07-09 17:56:36,735 INFO L384 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-07-09 17:56:36,735 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.start======== [2021-07-09 17:56:36,743 INFO L110 iNet2FiniteAutomaton]: Start petriNet2FiniteAutomaton. Operand has 28 places, 23 transitions, 62 flow [2021-07-09 17:56:36,756 INFO L132 iNet2FiniteAutomaton]: Finished petriNet2FiniteAutomaton. Result has 33 states, 32 states have (on average 1.78125) internal successors, (57), 32 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-09 17:56:36,758 INFO L276 IsEmpty]: Start isEmpty. Operand has 33 states, 32 states have (on average 1.78125) internal successors, (57), 32 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-09 17:56:36,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-07-09 17:56:36,765 INFO L500 BasicCegarLoop]: Found error trace [2021-07-09 17:56:36,765 INFO L508 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-09 17:56:36,765 INFO L430 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-07-09 17:56:36,770 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-09 17:56:36,770 INFO L82 PathProgramCache]: Analyzing trace with hash -1829606569, now seen corresponding path program 1 times [2021-07-09 17:56:36,778 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-09 17:56:36,778 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1128017903] [2021-07-09 17:56:36,779 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-09 17:56:36,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-09 17:56:37,106 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-09 17:56:37,107 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-09 17:56:37,107 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1128017903] [2021-07-09 17:56:37,108 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1128017903] provided 1 perfect and 0 imperfect interpolant sequences [2021-07-09 17:56:37,109 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-07-09 17:56:37,110 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-07-09 17:56:37,110 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [418858941] [2021-07-09 17:56:37,114 INFO L462 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-07-09 17:56:37,115 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-09 17:56:37,129 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-07-09 17:56:37,130 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-07-09 17:56:37,132 INFO L87 Difference]: Start difference. First operand has 33 states, 32 states have (on average 1.78125) internal successors, (57), 32 states have internal predecessors, (57), 0 states have call successors, (0), 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 9 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 8 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-09 17:56:37,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-09 17:56:37,369 INFO L93 Difference]: Finished difference Result 67 states and 111 transitions. [2021-07-09 17:56:37,369 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-07-09 17:56:37,370 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 8 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2021-07-09 17:56:37,371 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-09 17:56:37,381 INFO L225 Difference]: With dead ends: 67 [2021-07-09 17:56:37,381 INFO L226 Difference]: Without dead ends: 52 [2021-07-09 17:56:37,385 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 263.5ms TimeCoverageRelationStatistics Valid=64, Invalid=118, Unknown=0, NotChecked=0, Total=182 [2021-07-09 17:56:37,398 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-07-09 17:56:37,419 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 39. [2021-07-09 17:56:37,420 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 38 states have (on average 1.8157894736842106) internal successors, (69), 38 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) [2021-07-09 17:56:37,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 69 transitions. [2021-07-09 17:56:37,424 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 69 transitions. Word has length 15 [2021-07-09 17:56:37,424 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-09 17:56:37,424 INFO L482 AbstractCegarLoop]: Abstraction has 39 states and 69 transitions. [2021-07-09 17:56:37,424 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 8 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-09 17:56:37,425 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 69 transitions. [2021-07-09 17:56:37,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-07-09 17:56:37,426 INFO L500 BasicCegarLoop]: Found error trace [2021-07-09 17:56:37,426 INFO L508 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-09 17:56:37,427 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-07-09 17:56:37,427 INFO L430 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-07-09 17:56:37,431 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-09 17:56:37,432 INFO L82 PathProgramCache]: Analyzing trace with hash -1179537599, now seen corresponding path program 2 times [2021-07-09 17:56:37,433 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-09 17:56:37,433 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [307969594] [2021-07-09 17:56:37,433 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-09 17:56:37,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-09 17:56:37,607 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-09 17:56:37,608 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-09 17:56:37,608 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [307969594] [2021-07-09 17:56:37,608 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [307969594] provided 1 perfect and 0 imperfect interpolant sequences [2021-07-09 17:56:37,608 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-07-09 17:56:37,608 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-07-09 17:56:37,609 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1984429625] [2021-07-09 17:56:37,610 INFO L462 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-07-09 17:56:37,610 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-09 17:56:37,611 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-07-09 17:56:37,611 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-07-09 17:56:37,611 INFO L87 Difference]: Start difference. First operand 39 states and 69 transitions. Second operand has 9 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 8 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-09 17:56:37,736 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-09 17:56:37,736 INFO L93 Difference]: Finished difference Result 50 states and 85 transitions. [2021-07-09 17:56:37,737 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-07-09 17:56:37,737 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 8 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2021-07-09 17:56:37,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-09 17:56:37,738 INFO L225 Difference]: With dead ends: 50 [2021-07-09 17:56:37,738 INFO L226 Difference]: Without dead ends: 43 [2021-07-09 17:56:37,739 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 151.2ms TimeCoverageRelationStatistics Valid=64, Invalid=118, Unknown=0, NotChecked=0, Total=182 [2021-07-09 17:56:37,739 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-07-09 17:56:37,743 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 41. [2021-07-09 17:56:37,743 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 40 states have (on average 1.8) internal successors, (72), 40 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-09 17:56:37,744 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 72 transitions. [2021-07-09 17:56:37,744 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 72 transitions. Word has length 15 [2021-07-09 17:56:37,745 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-09 17:56:37,745 INFO L482 AbstractCegarLoop]: Abstraction has 41 states and 72 transitions. [2021-07-09 17:56:37,745 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 8 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-09 17:56:37,745 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 72 transitions. [2021-07-09 17:56:37,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-07-09 17:56:37,746 INFO L500 BasicCegarLoop]: Found error trace [2021-07-09 17:56:37,746 INFO L508 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-09 17:56:37,746 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-07-09 17:56:37,746 INFO L430 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-07-09 17:56:37,747 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-09 17:56:37,747 INFO L82 PathProgramCache]: Analyzing trace with hash 1059156761, now seen corresponding path program 1 times [2021-07-09 17:56:37,747 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-09 17:56:37,747 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [215086764] [2021-07-09 17:56:37,747 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-09 17:56:37,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-09 17:56:37,923 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-09 17:56:37,923 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-09 17:56:37,924 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [215086764] [2021-07-09 17:56:37,924 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [215086764] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-09 17:56:37,924 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1560733072] [2021-07-09 17:56:37,924 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 [2021-07-09 17:56:37,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-09 17:56:37,965 INFO L263 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 13 conjunts are in the unsatisfiable core [2021-07-09 17:56:37,970 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-09 17:56:38,303 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-09 17:56:38,304 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1560733072] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-09 17:56:38,304 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-09 17:56:38,304 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 16 [2021-07-09 17:56:38,304 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1634920657] [2021-07-09 17:56:38,305 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-07-09 17:56:38,305 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-09 17:56:38,306 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-07-09 17:56:38,306 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=210, Unknown=0, NotChecked=0, Total=272 [2021-07-09 17:56:38,306 INFO L87 Difference]: Start difference. First operand 41 states and 72 transitions. Second operand has 17 states, 17 states have (on average 1.8823529411764706) internal successors, (32), 16 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) [2021-07-09 17:56:38,667 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-09 17:56:38,667 INFO L93 Difference]: Finished difference Result 107 states and 185 transitions. [2021-07-09 17:56:38,668 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-07-09 17:56:38,668 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.8823529411764706) internal successors, (32), 16 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2021-07-09 17:56:38,668 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-09 17:56:38,669 INFO L225 Difference]: With dead ends: 107 [2021-07-09 17:56:38,670 INFO L226 Difference]: Without dead ends: 93 [2021-07-09 17:56:38,670 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 9 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 99 ImplicationChecksByTransitivity, 483.7ms TimeCoverageRelationStatistics Valid=143, Invalid=457, Unknown=0, NotChecked=0, Total=600 [2021-07-09 17:56:38,670 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-07-09 17:56:38,675 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 46. [2021-07-09 17:56:38,675 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 45 states have (on average 1.8666666666666667) internal successors, (84), 45 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-09 17:56:38,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 84 transitions. [2021-07-09 17:56:38,676 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 84 transitions. Word has length 17 [2021-07-09 17:56:38,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-09 17:56:38,677 INFO L482 AbstractCegarLoop]: Abstraction has 46 states and 84 transitions. [2021-07-09 17:56:38,677 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 1.8823529411764706) internal successors, (32), 16 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) [2021-07-09 17:56:38,678 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 84 transitions. [2021-07-09 17:56:38,678 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-07-09 17:56:38,678 INFO L500 BasicCegarLoop]: Found error trace [2021-07-09 17:56:38,678 INFO L508 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-09 17:56:38,893 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-07-09 17:56:38,893 INFO L430 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-07-09 17:56:38,893 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-09 17:56:38,893 INFO L82 PathProgramCache]: Analyzing trace with hash 1709225731, now seen corresponding path program 2 times [2021-07-09 17:56:38,894 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-09 17:56:38,894 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [407508890] [2021-07-09 17:56:38,894 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-09 17:56:38,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-09 17:56:39,050 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-09 17:56:39,050 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-09 17:56:39,050 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [407508890] [2021-07-09 17:56:39,050 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [407508890] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-09 17:56:39,050 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1958451271] [2021-07-09 17:56:39,051 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 [2021-07-09 17:56:39,088 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-09 17:56:39,088 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-09 17:56:39,089 INFO L263 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 13 conjunts are in the unsatisfiable core [2021-07-09 17:56:39,089 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-09 17:56:39,332 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-09 17:56:39,332 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1958451271] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-09 17:56:39,332 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-09 17:56:39,333 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 16 [2021-07-09 17:56:39,333 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1161260523] [2021-07-09 17:56:39,333 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-07-09 17:56:39,333 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-09 17:56:39,334 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-07-09 17:56:39,334 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=210, Unknown=0, NotChecked=0, Total=272 [2021-07-09 17:56:39,334 INFO L87 Difference]: Start difference. First operand 46 states and 84 transitions. Second operand has 17 states, 17 states have (on average 1.8823529411764706) internal successors, (32), 16 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) [2021-07-09 17:56:39,784 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-09 17:56:39,785 INFO L93 Difference]: Finished difference Result 117 states and 198 transitions. [2021-07-09 17:56:39,785 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-07-09 17:56:39,786 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.8823529411764706) internal successors, (32), 16 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2021-07-09 17:56:39,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-09 17:56:39,787 INFO L225 Difference]: With dead ends: 117 [2021-07-09 17:56:39,787 INFO L226 Difference]: Without dead ends: 103 [2021-07-09 17:56:39,787 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 9 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 135 ImplicationChecksByTransitivity, 593.0ms TimeCoverageRelationStatistics Valid=188, Invalid=568, Unknown=0, NotChecked=0, Total=756 [2021-07-09 17:56:39,788 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2021-07-09 17:56:39,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 46. [2021-07-09 17:56:39,793 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 45 states have (on average 1.8666666666666667) internal successors, (84), 45 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-09 17:56:39,793 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 84 transitions. [2021-07-09 17:56:39,793 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 84 transitions. Word has length 17 [2021-07-09 17:56:39,793 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-09 17:56:39,794 INFO L482 AbstractCegarLoop]: Abstraction has 46 states and 84 transitions. [2021-07-09 17:56:39,794 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 1.8823529411764706) internal successors, (32), 16 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) [2021-07-09 17:56:39,794 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 84 transitions. [2021-07-09 17:56:39,794 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-07-09 17:56:39,795 INFO L500 BasicCegarLoop]: Found error trace [2021-07-09 17:56:39,795 INFO L508 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-09 17:56:40,018 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-09 17:56:40,018 INFO L430 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-07-09 17:56:40,019 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-09 17:56:40,019 INFO L82 PathProgramCache]: Analyzing trace with hash -351634071, now seen corresponding path program 3 times [2021-07-09 17:56:40,019 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-09 17:56:40,019 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [721716199] [2021-07-09 17:56:40,019 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-09 17:56:40,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-09 17:56:40,154 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-09 17:56:40,154 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-09 17:56:40,155 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [721716199] [2021-07-09 17:56:40,155 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [721716199] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-09 17:56:40,155 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1858111811] [2021-07-09 17:56:40,155 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 [2021-07-09 17:56:40,180 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-07-09 17:56:40,180 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-09 17:56:40,180 INFO L263 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 13 conjunts are in the unsatisfiable core [2021-07-09 17:56:40,181 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-09 17:56:40,428 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-09 17:56:40,428 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1858111811] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-09 17:56:40,428 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-09 17:56:40,428 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 16 [2021-07-09 17:56:40,428 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1619534040] [2021-07-09 17:56:40,429 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-07-09 17:56:40,429 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-09 17:56:40,429 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-07-09 17:56:40,429 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=211, Unknown=0, NotChecked=0, Total=272 [2021-07-09 17:56:40,430 INFO L87 Difference]: Start difference. First operand 46 states and 84 transitions. Second operand has 17 states, 17 states have (on average 1.8823529411764706) internal successors, (32), 16 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) [2021-07-09 17:56:40,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-09 17:56:40,790 INFO L93 Difference]: Finished difference Result 94 states and 156 transitions. [2021-07-09 17:56:40,790 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-07-09 17:56:40,790 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.8823529411764706) internal successors, (32), 16 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2021-07-09 17:56:40,791 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-09 17:56:40,792 INFO L225 Difference]: With dead ends: 94 [2021-07-09 17:56:40,793 INFO L226 Difference]: Without dead ends: 80 [2021-07-09 17:56:40,794 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 9 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 116 ImplicationChecksByTransitivity, 455.5ms TimeCoverageRelationStatistics Valid=170, Invalid=532, Unknown=0, NotChecked=0, Total=702 [2021-07-09 17:56:40,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-07-09 17:56:40,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 52. [2021-07-09 17:56:40,807 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 51 states have (on average 1.8235294117647058) internal successors, (93), 51 states have internal predecessors, (93), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-09 17:56:40,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 93 transitions. [2021-07-09 17:56:40,809 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 93 transitions. Word has length 17 [2021-07-09 17:56:40,810 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-09 17:56:40,810 INFO L482 AbstractCegarLoop]: Abstraction has 52 states and 93 transitions. [2021-07-09 17:56:40,812 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 1.8823529411764706) internal successors, (32), 16 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) [2021-07-09 17:56:40,812 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 93 transitions. [2021-07-09 17:56:40,814 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-07-09 17:56:40,814 INFO L500 BasicCegarLoop]: Found error trace [2021-07-09 17:56:40,814 INFO L508 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-09 17:56:41,037 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-09 17:56:41,037 INFO L430 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-07-09 17:56:41,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-09 17:56:41,038 INFO L82 PathProgramCache]: Analyzing trace with hash -886863873, now seen corresponding path program 4 times [2021-07-09 17:56:41,038 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-09 17:56:41,038 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1387909358] [2021-07-09 17:56:41,038 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-09 17:56:41,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-09 17:56:41,156 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-09 17:56:41,157 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-09 17:56:41,157 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1387909358] [2021-07-09 17:56:41,157 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1387909358] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-09 17:56:41,157 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1858899050] [2021-07-09 17:56:41,157 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 [2021-07-09 17:56:41,180 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-07-09 17:56:41,180 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-09 17:56:41,181 INFO L263 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 13 conjunts are in the unsatisfiable core [2021-07-09 17:56:41,182 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-09 17:56:41,435 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-09 17:56:41,435 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1858899050] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-09 17:56:41,435 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-09 17:56:41,435 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 16 [2021-07-09 17:56:41,437 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1618335264] [2021-07-09 17:56:41,438 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-07-09 17:56:41,438 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-09 17:56:41,438 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-07-09 17:56:41,438 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=213, Unknown=0, NotChecked=0, Total=272 [2021-07-09 17:56:41,439 INFO L87 Difference]: Start difference. First operand 52 states and 93 transitions. Second operand has 17 states, 17 states have (on average 1.8823529411764706) internal successors, (32), 16 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) [2021-07-09 17:56:41,731 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-09 17:56:41,731 INFO L93 Difference]: Finished difference Result 87 states and 147 transitions. [2021-07-09 17:56:41,731 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-07-09 17:56:41,732 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.8823529411764706) internal successors, (32), 16 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2021-07-09 17:56:41,732 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-09 17:56:41,733 INFO L225 Difference]: With dead ends: 87 [2021-07-09 17:56:41,733 INFO L226 Difference]: Without dead ends: 49 [2021-07-09 17:56:41,734 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 9 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 112 ImplicationChecksByTransitivity, 444.1ms TimeCoverageRelationStatistics Valid=175, Invalid=527, Unknown=0, NotChecked=0, Total=702 [2021-07-09 17:56:41,734 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-07-09 17:56:41,747 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 44. [2021-07-09 17:56:41,748 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 43 states have (on average 1.7906976744186047) internal successors, (77), 43 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-09 17:56:41,748 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 77 transitions. [2021-07-09 17:56:41,748 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 77 transitions. Word has length 17 [2021-07-09 17:56:41,748 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-09 17:56:41,748 INFO L482 AbstractCegarLoop]: Abstraction has 44 states and 77 transitions. [2021-07-09 17:56:41,748 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 1.8823529411764706) internal successors, (32), 16 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) [2021-07-09 17:56:41,749 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 77 transitions. [2021-07-09 17:56:41,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-07-09 17:56:41,751 INFO L500 BasicCegarLoop]: Found error trace [2021-07-09 17:56:41,751 INFO L508 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-09 17:56:41,952 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-09 17:56:41,952 INFO L430 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-07-09 17:56:41,952 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-09 17:56:41,952 INFO L82 PathProgramCache]: Analyzing trace with hash -980318313, now seen corresponding path program 1 times [2021-07-09 17:56:41,953 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-09 17:56:41,953 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [258576626] [2021-07-09 17:56:41,953 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-09 17:56:41,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-09 17:56:42,064 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-09 17:56:42,065 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-09 17:56:42,065 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [258576626] [2021-07-09 17:56:42,065 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [258576626] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-09 17:56:42,065 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1881313487] [2021-07-09 17:56:42,065 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 [2021-07-09 17:56:42,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-09 17:56:42,088 INFO L263 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 17 conjunts are in the unsatisfiable core [2021-07-09 17:56:42,089 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-09 17:56:42,311 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-09 17:56:42,311 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1881313487] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-09 17:56:42,312 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-09 17:56:42,312 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 18 [2021-07-09 17:56:42,312 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1822447163] [2021-07-09 17:56:42,312 INFO L462 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-07-09 17:56:42,312 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-09 17:56:42,313 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-07-09 17:56:42,313 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=282, Unknown=0, NotChecked=0, Total=342 [2021-07-09 17:56:42,313 INFO L87 Difference]: Start difference. First operand 44 states and 77 transitions. Second operand has 19 states, 19 states have (on average 1.894736842105263) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-09 17:56:42,654 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-09 17:56:42,654 INFO L93 Difference]: Finished difference Result 113 states and 197 transitions. [2021-07-09 17:56:42,655 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-07-09 17:56:42,655 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.894736842105263) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2021-07-09 17:56:42,656 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-09 17:56:42,657 INFO L225 Difference]: With dead ends: 113 [2021-07-09 17:56:42,657 INFO L226 Difference]: Without dead ends: 76 [2021-07-09 17:56:42,658 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 10 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 122 ImplicationChecksByTransitivity, 421.9ms TimeCoverageRelationStatistics Valid=141, Invalid=615, Unknown=0, NotChecked=0, Total=756 [2021-07-09 17:56:42,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2021-07-09 17:56:42,662 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 54. [2021-07-09 17:56:42,662 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 53 states have (on average 1.849056603773585) internal successors, (98), 53 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-09 17:56:42,665 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 98 transitions. [2021-07-09 17:56:42,666 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 98 transitions. Word has length 19 [2021-07-09 17:56:42,666 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-09 17:56:42,666 INFO L482 AbstractCegarLoop]: Abstraction has 54 states and 98 transitions. [2021-07-09 17:56:42,666 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 1.894736842105263) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-09 17:56:42,666 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 98 transitions. [2021-07-09 17:56:42,667 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-07-09 17:56:42,667 INFO L500 BasicCegarLoop]: Found error trace [2021-07-09 17:56:42,667 INFO L508 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-09 17:56:42,892 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-07-09 17:56:42,892 INFO L430 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-07-09 17:56:42,893 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-09 17:56:42,893 INFO L82 PathProgramCache]: Analyzing trace with hash 2049721123, now seen corresponding path program 2 times [2021-07-09 17:56:42,893 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-09 17:56:42,893 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [326070424] [2021-07-09 17:56:42,893 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-09 17:56:42,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-09 17:56:43,003 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-09 17:56:43,003 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-09 17:56:43,003 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [326070424] [2021-07-09 17:56:43,004 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [326070424] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-09 17:56:43,004 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [962864795] [2021-07-09 17:56:43,004 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 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 [2021-07-09 17:56:43,039 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-09 17:56:43,039 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-09 17:56:43,040 INFO L263 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 16 conjunts are in the unsatisfiable core [2021-07-09 17:56:43,041 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-09 17:56:43,304 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-09 17:56:43,304 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [962864795] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-09 17:56:43,304 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-09 17:56:43,304 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 18 [2021-07-09 17:56:43,304 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1842182092] [2021-07-09 17:56:43,305 INFO L462 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-07-09 17:56:43,305 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-09 17:56:43,305 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-07-09 17:56:43,306 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=282, Unknown=0, NotChecked=0, Total=342 [2021-07-09 17:56:43,306 INFO L87 Difference]: Start difference. First operand 54 states and 98 transitions. Second operand has 19 states, 19 states have (on average 1.894736842105263) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-09 17:56:43,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-09 17:56:43,735 INFO L93 Difference]: Finished difference Result 120 states and 202 transitions. [2021-07-09 17:56:43,735 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-07-09 17:56:43,735 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.894736842105263) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2021-07-09 17:56:43,736 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-09 17:56:43,736 INFO L225 Difference]: With dead ends: 120 [2021-07-09 17:56:43,736 INFO L226 Difference]: Without dead ends: 94 [2021-07-09 17:56:43,737 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 10 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 149 ImplicationChecksByTransitivity, 556.8ms TimeCoverageRelationStatistics Valid=175, Invalid=695, Unknown=0, NotChecked=0, Total=870 [2021-07-09 17:56:43,737 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2021-07-09 17:56:43,739 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 56. [2021-07-09 17:56:43,739 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 55 states have (on average 1.8363636363636364) internal successors, (101), 55 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-09 17:56:43,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 101 transitions. [2021-07-09 17:56:43,740 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 101 transitions. Word has length 19 [2021-07-09 17:56:43,740 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-09 17:56:43,740 INFO L482 AbstractCegarLoop]: Abstraction has 56 states and 101 transitions. [2021-07-09 17:56:43,740 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 1.894736842105263) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-09 17:56:43,740 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 101 transitions. [2021-07-09 17:56:43,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-07-09 17:56:43,741 INFO L500 BasicCegarLoop]: Found error trace [2021-07-09 17:56:43,741 INFO L508 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-09 17:56:43,966 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-09 17:56:43,966 INFO L430 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-07-09 17:56:43,966 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-09 17:56:43,967 INFO L82 PathProgramCache]: Analyzing trace with hash -1109060901, now seen corresponding path program 3 times [2021-07-09 17:56:43,967 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-09 17:56:43,967 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1156410425] [2021-07-09 17:56:43,967 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-09 17:56:43,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-09 17:56:44,094 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-09 17:56:44,094 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-09 17:56:44,094 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1156410425] [2021-07-09 17:56:44,094 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1156410425] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-09 17:56:44,094 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1975931914] [2021-07-09 17:56:44,094 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 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 [2021-07-09 17:56:44,120 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-07-09 17:56:44,120 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-09 17:56:44,121 INFO L263 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 17 conjunts are in the unsatisfiable core [2021-07-09 17:56:44,122 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-09 17:56:44,364 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-09 17:56:44,364 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1975931914] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-09 17:56:44,365 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-09 17:56:44,365 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 18 [2021-07-09 17:56:44,365 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [946035452] [2021-07-09 17:56:44,365 INFO L462 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-07-09 17:56:44,365 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-09 17:56:44,366 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-07-09 17:56:44,366 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=278, Unknown=0, NotChecked=0, Total=342 [2021-07-09 17:56:44,366 INFO L87 Difference]: Start difference. First operand 56 states and 101 transitions. Second operand has 19 states, 19 states have (on average 1.894736842105263) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-09 17:56:44,878 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-09 17:56:44,878 INFO L93 Difference]: Finished difference Result 130 states and 216 transitions. [2021-07-09 17:56:44,878 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-07-09 17:56:44,879 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.894736842105263) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2021-07-09 17:56:44,879 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-09 17:56:44,879 INFO L225 Difference]: With dead ends: 130 [2021-07-09 17:56:44,879 INFO L226 Difference]: Without dead ends: 110 [2021-07-09 17:56:44,880 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 10 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 191 ImplicationChecksByTransitivity, 562.6ms TimeCoverageRelationStatistics Valid=200, Invalid=792, Unknown=0, NotChecked=0, Total=992 [2021-07-09 17:56:44,880 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2021-07-09 17:56:44,886 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 65. [2021-07-09 17:56:44,886 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 64 states have (on average 1.875) internal successors, (120), 64 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-09 17:56:44,887 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 120 transitions. [2021-07-09 17:56:44,887 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 120 transitions. Word has length 19 [2021-07-09 17:56:44,887 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-09 17:56:44,887 INFO L482 AbstractCegarLoop]: Abstraction has 65 states and 120 transitions. [2021-07-09 17:56:44,887 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 1.894736842105263) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-09 17:56:44,887 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 120 transitions. [2021-07-09 17:56:44,887 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-07-09 17:56:44,887 INFO L500 BasicCegarLoop]: Found error trace [2021-07-09 17:56:44,888 INFO L508 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-09 17:56:45,100 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-09 17:56:45,101 INFO L430 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-07-09 17:56:45,101 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-09 17:56:45,101 INFO L82 PathProgramCache]: Analyzing trace with hash -458991931, now seen corresponding path program 4 times [2021-07-09 17:56:45,101 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-09 17:56:45,101 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [793577931] [2021-07-09 17:56:45,101 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-09 17:56:45,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-09 17:56:45,226 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-09 17:56:45,226 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-09 17:56:45,227 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [793577931] [2021-07-09 17:56:45,227 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [793577931] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-09 17:56:45,227 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [447674125] [2021-07-09 17:56:45,227 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 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 [2021-07-09 17:56:45,248 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-07-09 17:56:45,248 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-09 17:56:45,248 INFO L263 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 17 conjunts are in the unsatisfiable core [2021-07-09 17:56:45,249 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-09 17:56:45,502 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-09 17:56:45,502 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [447674125] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-09 17:56:45,502 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-09 17:56:45,502 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 18 [2021-07-09 17:56:45,502 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [612439946] [2021-07-09 17:56:45,503 INFO L462 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-07-09 17:56:45,503 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-09 17:56:45,503 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-07-09 17:56:45,503 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=278, Unknown=0, NotChecked=0, Total=342 [2021-07-09 17:56:45,503 INFO L87 Difference]: Start difference. First operand 65 states and 120 transitions. Second operand has 19 states, 19 states have (on average 1.894736842105263) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-09 17:56:45,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-09 17:56:45,936 INFO L93 Difference]: Finished difference Result 106 states and 184 transitions. [2021-07-09 17:56:45,936 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-07-09 17:56:45,937 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.894736842105263) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2021-07-09 17:56:45,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-09 17:56:45,937 INFO L225 Difference]: With dead ends: 106 [2021-07-09 17:56:45,937 INFO L226 Difference]: Without dead ends: 92 [2021-07-09 17:56:45,938 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 10 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 174 ImplicationChecksByTransitivity, 524.7ms TimeCoverageRelationStatistics Valid=193, Invalid=737, Unknown=0, NotChecked=0, Total=930 [2021-07-09 17:56:45,938 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2021-07-09 17:56:45,940 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 67. [2021-07-09 17:56:45,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 66 states have (on average 1.8636363636363635) internal successors, (123), 66 states have internal predecessors, (123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-09 17:56:45,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 123 transitions. [2021-07-09 17:56:45,941 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 123 transitions. Word has length 19 [2021-07-09 17:56:45,941 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-09 17:56:45,941 INFO L482 AbstractCegarLoop]: Abstraction has 67 states and 123 transitions. [2021-07-09 17:56:45,941 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 1.894736842105263) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-09 17:56:45,941 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 123 transitions. [2021-07-09 17:56:45,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-07-09 17:56:45,942 INFO L500 BasicCegarLoop]: Found error trace [2021-07-09 17:56:45,942 INFO L508 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-09 17:56:46,148 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-07-09 17:56:46,149 INFO L430 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-07-09 17:56:46,149 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-09 17:56:46,149 INFO L82 PathProgramCache]: Analyzing trace with hash -2036952865, now seen corresponding path program 5 times [2021-07-09 17:56:46,149 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-09 17:56:46,149 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [935180218] [2021-07-09 17:56:46,150 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-09 17:56:46,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-09 17:56:46,268 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-09 17:56:46,268 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-09 17:56:46,269 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [935180218] [2021-07-09 17:56:46,269 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [935180218] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-09 17:56:46,269 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2136878383] [2021-07-09 17:56:46,269 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 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 [2021-07-09 17:56:46,304 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-07-09 17:56:46,304 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-09 17:56:46,305 INFO L263 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 17 conjunts are in the unsatisfiable core [2021-07-09 17:56:46,308 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-09 17:56:46,519 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-09 17:56:46,519 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2136878383] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-09 17:56:46,519 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-09 17:56:46,520 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 18 [2021-07-09 17:56:46,520 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [612279348] [2021-07-09 17:56:46,520 INFO L462 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-07-09 17:56:46,520 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-09 17:56:46,521 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-07-09 17:56:46,521 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=277, Unknown=0, NotChecked=0, Total=342 [2021-07-09 17:56:46,521 INFO L87 Difference]: Start difference. First operand 67 states and 123 transitions. Second operand has 19 states, 19 states have (on average 1.894736842105263) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-09 17:56:46,690 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-09 17:56:46,690 INFO L93 Difference]: Finished difference Result 95 states and 164 transitions. [2021-07-09 17:56:46,691 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-07-09 17:56:46,691 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.894736842105263) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2021-07-09 17:56:46,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-09 17:56:46,692 INFO L225 Difference]: With dead ends: 95 [2021-07-09 17:56:46,692 INFO L226 Difference]: Without dead ends: 82 [2021-07-09 17:56:46,692 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 10 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 304.8ms TimeCoverageRelationStatistics Valid=94, Invalid=412, Unknown=0, NotChecked=0, Total=506 [2021-07-09 17:56:46,692 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2021-07-09 17:56:46,694 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 64. [2021-07-09 17:56:46,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 63 states have (on average 1.8571428571428572) internal successors, (117), 63 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-09 17:56:46,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 117 transitions. [2021-07-09 17:56:46,695 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 117 transitions. Word has length 19 [2021-07-09 17:56:46,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-09 17:56:46,695 INFO L482 AbstractCegarLoop]: Abstraction has 64 states and 117 transitions. [2021-07-09 17:56:46,695 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 1.894736842105263) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-09 17:56:46,695 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 117 transitions. [2021-07-09 17:56:46,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-07-09 17:56:46,696 INFO L500 BasicCegarLoop]: Found error trace [2021-07-09 17:56:46,696 INFO L508 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-09 17:56:46,912 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-09 17:56:46,913 INFO L430 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-07-09 17:56:46,913 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-09 17:56:46,913 INFO L82 PathProgramCache]: Analyzing trace with hash -900767593, now seen corresponding path program 6 times [2021-07-09 17:56:46,913 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-09 17:56:46,913 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [109159957] [2021-07-09 17:56:46,914 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-09 17:56:46,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-09 17:56:47,044 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-09 17:56:47,044 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-09 17:56:47,044 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [109159957] [2021-07-09 17:56:47,044 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [109159957] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-09 17:56:47,045 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [416323509] [2021-07-09 17:56:47,045 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 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 [2021-07-09 17:56:47,067 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-07-09 17:56:47,067 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-09 17:56:47,068 INFO L263 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 16 conjunts are in the unsatisfiable core [2021-07-09 17:56:47,069 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-09 17:56:47,318 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-09 17:56:47,319 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [416323509] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-09 17:56:47,319 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-09 17:56:47,319 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 18 [2021-07-09 17:56:47,319 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2121376151] [2021-07-09 17:56:47,319 INFO L462 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-07-09 17:56:47,319 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-09 17:56:47,320 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-07-09 17:56:47,320 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=273, Unknown=0, NotChecked=0, Total=342 [2021-07-09 17:56:47,320 INFO L87 Difference]: Start difference. First operand 64 states and 117 transitions. Second operand has 19 states, 19 states have (on average 1.894736842105263) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-09 17:56:47,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-09 17:56:47,470 INFO L93 Difference]: Finished difference Result 86 states and 145 transitions. [2021-07-09 17:56:47,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-07-09 17:56:47,471 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.894736842105263) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2021-07-09 17:56:47,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-09 17:56:47,471 INFO L225 Difference]: With dead ends: 86 [2021-07-09 17:56:47,471 INFO L226 Difference]: Without dead ends: 76 [2021-07-09 17:56:47,472 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 10 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 270.6ms TimeCoverageRelationStatistics Valid=86, Invalid=334, Unknown=0, NotChecked=0, Total=420 [2021-07-09 17:56:47,472 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2021-07-09 17:56:47,473 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 59. [2021-07-09 17:56:47,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 58 states have (on average 1.8275862068965518) internal successors, (106), 58 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-09 17:56:47,474 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 106 transitions. [2021-07-09 17:56:47,474 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 106 transitions. Word has length 19 [2021-07-09 17:56:47,474 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-09 17:56:47,474 INFO L482 AbstractCegarLoop]: Abstraction has 59 states and 106 transitions. [2021-07-09 17:56:47,475 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 1.894736842105263) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-09 17:56:47,475 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 106 transitions. [2021-07-09 17:56:47,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-07-09 17:56:47,475 INFO L500 BasicCegarLoop]: Found error trace [2021-07-09 17:56:47,475 INFO L508 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-09 17:56:47,675 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-09 17:56:47,676 INFO L430 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-07-09 17:56:47,676 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-09 17:56:47,676 INFO L82 PathProgramCache]: Analyzing trace with hash -250698623, now seen corresponding path program 7 times [2021-07-09 17:56:47,676 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-09 17:56:47,677 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1011559841] [2021-07-09 17:56:47,677 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-09 17:56:47,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-09 17:56:47,800 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-09 17:56:47,800 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-09 17:56:47,800 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1011559841] [2021-07-09 17:56:47,800 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1011559841] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-09 17:56:47,800 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [811730221] [2021-07-09 17:56:47,800 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 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 [2021-07-09 17:56:47,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-09 17:56:47,822 INFO L263 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 17 conjunts are in the unsatisfiable core [2021-07-09 17:56:47,822 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-09 17:56:48,052 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-09 17:56:48,053 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [811730221] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-09 17:56:48,053 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-09 17:56:48,053 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 18 [2021-07-09 17:56:48,053 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1091479478] [2021-07-09 17:56:48,053 INFO L462 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-07-09 17:56:48,053 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-09 17:56:48,054 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-07-09 17:56:48,054 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=271, Unknown=0, NotChecked=0, Total=342 [2021-07-09 17:56:48,054 INFO L87 Difference]: Start difference. First operand 59 states and 106 transitions. Second operand has 19 states, 19 states have (on average 1.894736842105263) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-09 17:56:48,229 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-09 17:56:48,229 INFO L93 Difference]: Finished difference Result 74 states and 129 transitions. [2021-07-09 17:56:48,230 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-07-09 17:56:48,230 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.894736842105263) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2021-07-09 17:56:48,230 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-09 17:56:48,230 INFO L225 Difference]: With dead ends: 74 [2021-07-09 17:56:48,230 INFO L226 Difference]: Without dead ends: 67 [2021-07-09 17:56:48,231 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 10 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 260.0ms TimeCoverageRelationStatistics Valid=88, Invalid=332, Unknown=0, NotChecked=0, Total=420 [2021-07-09 17:56:48,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2021-07-09 17:56:48,234 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 56. [2021-07-09 17:56:48,234 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 55 states have (on average 1.8181818181818181) internal successors, (100), 55 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-09 17:56:48,234 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 100 transitions. [2021-07-09 17:56:48,234 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 100 transitions. Word has length 19 [2021-07-09 17:56:48,235 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-09 17:56:48,235 INFO L482 AbstractCegarLoop]: Abstraction has 56 states and 100 transitions. [2021-07-09 17:56:48,235 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 1.894736842105263) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-09 17:56:48,235 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 100 transitions. [2021-07-09 17:56:48,237 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-07-09 17:56:48,237 INFO L500 BasicCegarLoop]: Found error trace [2021-07-09 17:56:48,237 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-09 17:56:48,456 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-07-09 17:56:48,457 INFO L430 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-07-09 17:56:48,457 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-09 17:56:48,457 INFO L82 PathProgramCache]: Analyzing trace with hash 798154329, now seen corresponding path program 8 times [2021-07-09 17:56:48,457 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-09 17:56:48,457 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [143720621] [2021-07-09 17:56:48,457 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-09 17:56:48,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-09 17:56:48,580 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-07-09 17:56:48,581 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-09 17:56:48,581 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [143720621] [2021-07-09 17:56:48,581 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [143720621] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-09 17:56:48,581 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [173867378] [2021-07-09 17:56:48,581 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 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 [2021-07-09 17:56:48,603 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-09 17:56:48,603 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-09 17:56:48,603 INFO L263 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 21 conjunts are in the unsatisfiable core [2021-07-09 17:56:48,604 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-09 17:56:48,831 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-09 17:56:48,832 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [173867378] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-09 17:56:48,832 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-09 17:56:48,832 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11] total 19 [2021-07-09 17:56:48,832 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [735829520] [2021-07-09 17:56:48,832 INFO L462 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-07-09 17:56:48,832 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-09 17:56:48,832 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-07-09 17:56:48,833 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=318, Unknown=0, NotChecked=0, Total=380 [2021-07-09 17:56:48,833 INFO L87 Difference]: Start difference. First operand 56 states and 100 transitions. Second operand has 20 states, 20 states have (on average 2.0) internal successors, (40), 19 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) [2021-07-09 17:56:49,446 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-09 17:56:49,447 INFO L93 Difference]: Finished difference Result 107 states and 190 transitions. [2021-07-09 17:56:49,447 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-07-09 17:56:49,447 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.0) internal successors, (40), 19 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-07-09 17:56:49,447 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-09 17:56:49,448 INFO L225 Difference]: With dead ends: 107 [2021-07-09 17:56:49,448 INFO L226 Difference]: Without dead ends: 65 [2021-07-09 17:56:49,448 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 12 SyntacticMatches, 1 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 368 ImplicationChecksByTransitivity, 677.8ms TimeCoverageRelationStatistics Valid=271, Invalid=1289, Unknown=0, NotChecked=0, Total=1560 [2021-07-09 17:56:49,448 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-07-09 17:56:49,450 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 51. [2021-07-09 17:56:49,450 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 50 states have (on average 1.74) internal successors, (87), 50 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-09 17:56:49,450 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 87 transitions. [2021-07-09 17:56:49,450 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 87 transitions. Word has length 21 [2021-07-09 17:56:49,450 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-09 17:56:49,450 INFO L482 AbstractCegarLoop]: Abstraction has 51 states and 87 transitions. [2021-07-09 17:56:49,451 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 2.0) internal successors, (40), 19 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) [2021-07-09 17:56:49,451 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 87 transitions. [2021-07-09 17:56:49,451 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-07-09 17:56:49,451 INFO L500 BasicCegarLoop]: Found error trace [2021-07-09 17:56:49,451 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-09 17:56:49,657 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-07-09 17:56:49,657 INFO L430 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-07-09 17:56:49,657 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-09 17:56:49,657 INFO L82 PathProgramCache]: Analyzing trace with hash -466773531, now seen corresponding path program 9 times [2021-07-09 17:56:49,657 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-09 17:56:49,657 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [557136444] [2021-07-09 17:56:49,658 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-09 17:56:49,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-09 17:56:49,763 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-07-09 17:56:49,763 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-09 17:56:49,763 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [557136444] [2021-07-09 17:56:49,763 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [557136444] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-09 17:56:49,763 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [932003915] [2021-07-09 17:56:49,763 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 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 [2021-07-09 17:56:49,786 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-07-09 17:56:49,787 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-09 17:56:49,787 INFO L263 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 21 conjunts are in the unsatisfiable core [2021-07-09 17:56:49,788 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-09 17:56:50,027 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-09 17:56:50,027 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [932003915] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-09 17:56:50,027 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-09 17:56:50,027 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11] total 19 [2021-07-09 17:56:50,027 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [303846424] [2021-07-09 17:56:50,028 INFO L462 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-07-09 17:56:50,028 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-09 17:56:50,028 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-07-09 17:56:50,028 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=318, Unknown=0, NotChecked=0, Total=380 [2021-07-09 17:56:50,029 INFO L87 Difference]: Start difference. First operand 51 states and 87 transitions. Second operand has 20 states, 20 states have (on average 2.0) internal successors, (40), 19 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) [2021-07-09 17:56:50,707 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-09 17:56:50,707 INFO L93 Difference]: Finished difference Result 85 states and 141 transitions. [2021-07-09 17:56:50,708 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-07-09 17:56:50,708 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.0) internal successors, (40), 19 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-07-09 17:56:50,708 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-09 17:56:50,708 INFO L225 Difference]: With dead ends: 85 [2021-07-09 17:56:50,708 INFO L226 Difference]: Without dead ends: 56 [2021-07-09 17:56:50,709 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 12 SyntacticMatches, 1 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 552 ImplicationChecksByTransitivity, 753.3ms TimeCoverageRelationStatistics Valid=359, Invalid=1711, Unknown=0, NotChecked=0, Total=2070 [2021-07-09 17:56:50,709 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-07-09 17:56:50,710 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 48. [2021-07-09 17:56:50,711 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 47 states have (on average 1.7234042553191489) internal successors, (81), 47 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-09 17:56:50,711 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 81 transitions. [2021-07-09 17:56:50,711 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 81 transitions. Word has length 21 [2021-07-09 17:56:50,711 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-09 17:56:50,711 INFO L482 AbstractCegarLoop]: Abstraction has 48 states and 81 transitions. [2021-07-09 17:56:50,711 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 2.0) internal successors, (40), 19 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) [2021-07-09 17:56:50,712 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 81 transitions. [2021-07-09 17:56:50,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-07-09 17:56:50,712 INFO L500 BasicCegarLoop]: Found error trace [2021-07-09 17:56:50,712 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-09 17:56:50,921 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-07-09 17:56:50,921 INFO L430 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-07-09 17:56:50,921 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-09 17:56:50,921 INFO L82 PathProgramCache]: Analyzing trace with hash 669411741, now seen corresponding path program 10 times [2021-07-09 17:56:50,921 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-09 17:56:50,921 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [474586344] [2021-07-09 17:56:50,922 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-09 17:56:50,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-09 17:56:51,029 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-07-09 17:56:51,030 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-09 17:56:51,030 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [474586344] [2021-07-09 17:56:51,030 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [474586344] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-09 17:56:51,030 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [756506559] [2021-07-09 17:56:51,030 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 [2021-07-09 17:56:51,059 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-07-09 17:56:51,060 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-09 17:56:51,060 INFO L263 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 21 conjunts are in the unsatisfiable core [2021-07-09 17:56:51,061 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-09 17:56:51,291 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-09 17:56:51,291 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [756506559] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-09 17:56:51,291 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-09 17:56:51,291 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11] total 19 [2021-07-09 17:56:51,291 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [720266259] [2021-07-09 17:56:51,292 INFO L462 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-07-09 17:56:51,292 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-09 17:56:51,292 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-07-09 17:56:51,292 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=314, Unknown=0, NotChecked=0, Total=380 [2021-07-09 17:56:51,292 INFO L87 Difference]: Start difference. First operand 48 states and 81 transitions. Second operand has 20 states, 20 states have (on average 2.0) internal successors, (40), 19 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) [2021-07-09 17:56:52,283 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-09 17:56:52,283 INFO L93 Difference]: Finished difference Result 90 states and 147 transitions. [2021-07-09 17:56:52,283 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-07-09 17:56:52,284 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.0) internal successors, (40), 19 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-07-09 17:56:52,284 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-09 17:56:52,284 INFO L225 Difference]: With dead ends: 90 [2021-07-09 17:56:52,284 INFO L226 Difference]: Without dead ends: 70 [2021-07-09 17:56:52,285 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 12 SyntacticMatches, 1 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 694 ImplicationChecksByTransitivity, 983.6ms TimeCoverageRelationStatistics Valid=441, Invalid=2109, Unknown=0, NotChecked=0, Total=2550 [2021-07-09 17:56:52,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2021-07-09 17:56:52,287 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 45. [2021-07-09 17:56:52,287 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 44 states have (on average 1.7045454545454546) internal successors, (75), 44 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-09 17:56:52,287 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 75 transitions. [2021-07-09 17:56:52,287 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 75 transitions. Word has length 21 [2021-07-09 17:56:52,287 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-09 17:56:52,287 INFO L482 AbstractCegarLoop]: Abstraction has 45 states and 75 transitions. [2021-07-09 17:56:52,288 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 2.0) internal successors, (40), 19 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) [2021-07-09 17:56:52,288 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 75 transitions. [2021-07-09 17:56:52,288 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-07-09 17:56:52,288 INFO L500 BasicCegarLoop]: Found error trace [2021-07-09 17:56:52,288 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-09 17:56:52,513 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-09 17:56:52,513 INFO L430 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-07-09 17:56:52,513 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-09 17:56:52,513 INFO L82 PathProgramCache]: Analyzing trace with hash 1319480711, now seen corresponding path program 11 times [2021-07-09 17:56:52,513 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-09 17:56:52,513 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [108489429] [2021-07-09 17:56:52,513 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-09 17:56:52,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-09 17:56:52,615 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-07-09 17:56:52,615 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-09 17:56:52,615 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [108489429] [2021-07-09 17:56:52,616 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [108489429] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-09 17:56:52,616 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [189118907] [2021-07-09 17:56:52,616 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 [2021-07-09 17:56:52,638 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-07-09 17:56:52,638 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-09 17:56:52,638 INFO L263 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 21 conjunts are in the unsatisfiable core [2021-07-09 17:56:52,639 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-09 17:56:52,882 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-09 17:56:52,882 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [189118907] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-09 17:56:52,882 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-09 17:56:52,882 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11] total 19 [2021-07-09 17:56:52,882 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1161835335] [2021-07-09 17:56:52,882 INFO L462 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-07-09 17:56:52,883 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-09 17:56:52,883 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-07-09 17:56:52,883 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=314, Unknown=0, NotChecked=0, Total=380 [2021-07-09 17:56:52,883 INFO L87 Difference]: Start difference. First operand 45 states and 75 transitions. Second operand has 20 states, 20 states have (on average 2.0) internal successors, (40), 19 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) [2021-07-09 17:56:53,874 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-09 17:56:53,874 INFO L93 Difference]: Finished difference Result 79 states and 133 transitions. [2021-07-09 17:56:53,874 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-07-09 17:56:53,875 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.0) internal successors, (40), 19 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-07-09 17:56:53,875 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-09 17:56:53,875 INFO L225 Difference]: With dead ends: 79 [2021-07-09 17:56:53,875 INFO L226 Difference]: Without dead ends: 65 [2021-07-09 17:56:53,876 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 12 SyntacticMatches, 1 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 690 ImplicationChecksByTransitivity, 1001.5ms TimeCoverageRelationStatistics Valid=441, Invalid=2109, Unknown=0, NotChecked=0, Total=2550 [2021-07-09 17:56:53,876 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-07-09 17:56:53,877 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 45. [2021-07-09 17:56:53,877 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 44 states have (on average 1.7045454545454546) internal successors, (75), 44 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-09 17:56:53,877 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 75 transitions. [2021-07-09 17:56:53,877 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 75 transitions. Word has length 21 [2021-07-09 17:56:53,877 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-09 17:56:53,877 INFO L482 AbstractCegarLoop]: Abstraction has 45 states and 75 transitions. [2021-07-09 17:56:53,878 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 2.0) internal successors, (40), 19 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) [2021-07-09 17:56:53,878 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 75 transitions. [2021-07-09 17:56:53,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-07-09 17:56:53,878 INFO L500 BasicCegarLoop]: Found error trace [2021-07-09 17:56:53,878 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-09 17:56:54,078 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-07-09 17:56:54,079 INFO L430 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-07-09 17:56:54,079 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-09 17:56:54,079 INFO L82 PathProgramCache]: Analyzing trace with hash -1793458263, now seen corresponding path program 12 times [2021-07-09 17:56:54,079 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-09 17:56:54,079 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1583440855] [2021-07-09 17:56:54,079 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-09 17:56:54,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-09 17:56:54,196 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-09 17:56:54,196 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-09 17:56:54,196 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1583440855] [2021-07-09 17:56:54,196 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1583440855] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-09 17:56:54,197 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [52883726] [2021-07-09 17:56:54,197 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 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 [2021-07-09 17:56:54,219 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-07-09 17:56:54,219 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-09 17:56:54,220 INFO L263 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 20 conjunts are in the unsatisfiable core [2021-07-09 17:56:54,222 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-09 17:56:54,450 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-09 17:56:54,450 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [52883726] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-09 17:56:54,450 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-09 17:56:54,450 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 20 [2021-07-09 17:56:54,450 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [889481947] [2021-07-09 17:56:54,450 INFO L462 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-07-09 17:56:54,450 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-09 17:56:54,451 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-07-09 17:56:54,451 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=355, Unknown=0, NotChecked=0, Total=420 [2021-07-09 17:56:54,451 INFO L87 Difference]: Start difference. First operand 45 states and 75 transitions. Second operand has 21 states, 21 states have (on average 1.9047619047619047) internal successors, (40), 20 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) [2021-07-09 17:56:54,969 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-09 17:56:54,969 INFO L93 Difference]: Finished difference Result 107 states and 173 transitions. [2021-07-09 17:56:54,969 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-07-09 17:56:54,969 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.9047619047619047) internal successors, (40), 20 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-07-09 17:56:54,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-09 17:56:54,970 INFO L225 Difference]: With dead ends: 107 [2021-07-09 17:56:54,970 INFO L226 Difference]: Without dead ends: 93 [2021-07-09 17:56:54,970 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 11 SyntacticMatches, 1 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 295 ImplicationChecksByTransitivity, 586.1ms TimeCoverageRelationStatistics Valid=224, Invalid=1108, Unknown=0, NotChecked=0, Total=1332 [2021-07-09 17:56:54,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-07-09 17:56:54,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 49. [2021-07-09 17:56:54,972 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 48 states have (on average 1.8125) internal successors, (87), 48 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-09 17:56:54,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 87 transitions. [2021-07-09 17:56:54,972 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 87 transitions. Word has length 21 [2021-07-09 17:56:54,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-09 17:56:54,973 INFO L482 AbstractCegarLoop]: Abstraction has 49 states and 87 transitions. [2021-07-09 17:56:54,973 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 1.9047619047619047) internal successors, (40), 20 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) [2021-07-09 17:56:54,973 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 87 transitions. [2021-07-09 17:56:54,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-07-09 17:56:54,973 INFO L500 BasicCegarLoop]: Found error trace [2021-07-09 17:56:54,973 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-09 17:56:55,181 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-07-09 17:56:55,181 INFO L430 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-07-09 17:56:55,181 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-09 17:56:55,181 INFO L82 PathProgramCache]: Analyzing trace with hash 1615710753, now seen corresponding path program 13 times [2021-07-09 17:56:55,181 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-09 17:56:55,181 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [827666661] [2021-07-09 17:56:55,181 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-09 17:56:55,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-09 17:56:55,295 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-09 17:56:55,295 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-09 17:56:55,295 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [827666661] [2021-07-09 17:56:55,295 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [827666661] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-09 17:56:55,295 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [331530050] [2021-07-09 17:56:55,295 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 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 [2021-07-09 17:56:55,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-09 17:56:55,317 INFO L263 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 21 conjunts are in the unsatisfiable core [2021-07-09 17:56:55,318 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-09 17:56:55,550 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-09 17:56:55,550 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [331530050] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-09 17:56:55,550 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-09 17:56:55,550 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 20 [2021-07-09 17:56:55,550 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [839416727] [2021-07-09 17:56:55,551 INFO L462 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-07-09 17:56:55,551 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-09 17:56:55,551 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-07-09 17:56:55,551 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=353, Unknown=0, NotChecked=0, Total=420 [2021-07-09 17:56:55,551 INFO L87 Difference]: Start difference. First operand 49 states and 87 transitions. Second operand has 21 states, 21 states have (on average 1.9047619047619047) internal successors, (40), 20 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) [2021-07-09 17:56:56,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-09 17:56:56,046 INFO L93 Difference]: Finished difference Result 114 states and 189 transitions. [2021-07-09 17:56:56,047 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-07-09 17:56:56,047 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.9047619047619047) internal successors, (40), 20 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-07-09 17:56:56,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-09 17:56:56,048 INFO L225 Difference]: With dead ends: 114 [2021-07-09 17:56:56,048 INFO L226 Difference]: Without dead ends: 100 [2021-07-09 17:56:56,048 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 11 SyntacticMatches, 1 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 294 ImplicationChecksByTransitivity, 578.6ms TimeCoverageRelationStatistics Valid=224, Invalid=1108, Unknown=0, NotChecked=0, Total=1332 [2021-07-09 17:56:56,048 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2021-07-09 17:56:56,050 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 50. [2021-07-09 17:56:56,050 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 49 states have (on average 1.816326530612245) internal successors, (89), 49 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-09 17:56:56,050 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 89 transitions. [2021-07-09 17:56:56,050 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 89 transitions. Word has length 21 [2021-07-09 17:56:56,051 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-09 17:56:56,051 INFO L482 AbstractCegarLoop]: Abstraction has 50 states and 89 transitions. [2021-07-09 17:56:56,051 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 1.9047619047619047) internal successors, (40), 20 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) [2021-07-09 17:56:56,051 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 89 transitions. [2021-07-09 17:56:56,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-07-09 17:56:56,051 INFO L500 BasicCegarLoop]: Found error trace [2021-07-09 17:56:56,051 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-09 17:56:56,252 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-09 17:56:56,252 INFO L430 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-07-09 17:56:56,252 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-09 17:56:56,252 INFO L82 PathProgramCache]: Analyzing trace with hash 603018221, now seen corresponding path program 14 times [2021-07-09 17:56:56,252 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-09 17:56:56,252 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1451194501] [2021-07-09 17:56:56,253 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-09 17:56:56,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-09 17:56:56,367 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-09 17:56:56,367 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-09 17:56:56,367 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1451194501] [2021-07-09 17:56:56,367 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1451194501] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-09 17:56:56,368 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1456214723] [2021-07-09 17:56:56,368 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 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 [2021-07-09 17:56:56,389 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-09 17:56:56,389 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-09 17:56:56,390 INFO L263 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 20 conjunts are in the unsatisfiable core [2021-07-09 17:56:56,390 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-09 17:56:56,673 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-09 17:56:56,673 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1456214723] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-09 17:56:56,673 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-09 17:56:56,673 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 20 [2021-07-09 17:56:56,673 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1344410300] [2021-07-09 17:56:56,674 INFO L462 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-07-09 17:56:56,674 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-09 17:56:56,674 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-07-09 17:56:56,674 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=356, Unknown=0, NotChecked=0, Total=420 [2021-07-09 17:56:56,674 INFO L87 Difference]: Start difference. First operand 50 states and 89 transitions. Second operand has 21 states, 21 states have (on average 1.9047619047619047) internal successors, (40), 20 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) [2021-07-09 17:56:57,385 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-09 17:56:57,386 INFO L93 Difference]: Finished difference Result 182 states and 297 transitions. [2021-07-09 17:56:57,386 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-07-09 17:56:57,386 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.9047619047619047) internal successors, (40), 20 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-07-09 17:56:57,386 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-09 17:56:57,387 INFO L225 Difference]: With dead ends: 182 [2021-07-09 17:56:57,387 INFO L226 Difference]: Without dead ends: 161 [2021-07-09 17:56:57,388 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 11 SyntacticMatches, 1 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 524 ImplicationChecksByTransitivity, 785.3ms TimeCoverageRelationStatistics Valid=338, Invalid=1732, Unknown=0, NotChecked=0, Total=2070 [2021-07-09 17:56:57,388 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 161 states. [2021-07-09 17:56:57,390 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 161 to 55. [2021-07-09 17:56:57,390 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 54 states have (on average 1.9259259259259258) internal successors, (104), 54 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-09 17:56:57,390 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 104 transitions. [2021-07-09 17:56:57,390 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 104 transitions. Word has length 21 [2021-07-09 17:56:57,391 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-09 17:56:57,391 INFO L482 AbstractCegarLoop]: Abstraction has 55 states and 104 transitions. [2021-07-09 17:56:57,391 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 1.9047619047619047) internal successors, (40), 20 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) [2021-07-09 17:56:57,391 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 104 transitions. [2021-07-09 17:56:57,391 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-07-09 17:56:57,391 INFO L500 BasicCegarLoop]: Found error trace [2021-07-09 17:56:57,391 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-09 17:56:57,597 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-09 17:56:57,597 INFO L430 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-07-09 17:56:57,597 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-09 17:56:57,598 INFO L82 PathProgramCache]: Analyzing trace with hash 67788419, now seen corresponding path program 15 times [2021-07-09 17:56:57,598 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-09 17:56:57,598 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1885038228] [2021-07-09 17:56:57,598 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-09 17:56:57,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-09 17:56:57,711 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-09 17:56:57,712 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-09 17:56:57,712 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1885038228] [2021-07-09 17:56:57,712 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1885038228] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-09 17:56:57,712 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [954293543] [2021-07-09 17:56:57,712 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 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 [2021-07-09 17:56:57,733 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-07-09 17:56:57,733 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-09 17:56:57,734 INFO L263 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 21 conjunts are in the unsatisfiable core [2021-07-09 17:56:57,734 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-09 17:56:57,950 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-09 17:56:57,951 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [954293543] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-09 17:56:57,951 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-09 17:56:57,951 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 20 [2021-07-09 17:56:57,951 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [217982719] [2021-07-09 17:56:57,951 INFO L462 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-07-09 17:56:57,951 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-09 17:56:57,951 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-07-09 17:56:57,952 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=356, Unknown=0, NotChecked=0, Total=420 [2021-07-09 17:56:57,952 INFO L87 Difference]: Start difference. First operand 55 states and 104 transitions. Second operand has 21 states, 21 states have (on average 1.9047619047619047) internal successors, (40), 20 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) [2021-07-09 17:56:58,535 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-09 17:56:58,535 INFO L93 Difference]: Finished difference Result 143 states and 238 transitions. [2021-07-09 17:56:58,535 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-07-09 17:56:58,535 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.9047619047619047) internal successors, (40), 20 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-07-09 17:56:58,535 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-09 17:56:58,536 INFO L225 Difference]: With dead ends: 143 [2021-07-09 17:56:58,536 INFO L226 Difference]: Without dead ends: 90 [2021-07-09 17:56:58,537 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 11 SyntacticMatches, 1 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 455 ImplicationChecksByTransitivity, 670.9ms TimeCoverageRelationStatistics Valid=326, Invalid=1566, Unknown=0, NotChecked=0, Total=1892 [2021-07-09 17:56:58,537 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2021-07-09 17:56:58,538 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 47. [2021-07-09 17:56:58,538 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 46 states have (on average 1.8043478260869565) internal successors, (83), 46 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-09 17:56:58,539 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 83 transitions. [2021-07-09 17:56:58,539 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 83 transitions. Word has length 21 [2021-07-09 17:56:58,539 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-09 17:56:58,539 INFO L482 AbstractCegarLoop]: Abstraction has 47 states and 83 transitions. [2021-07-09 17:56:58,539 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 1.9047619047619047) internal successors, (40), 20 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) [2021-07-09 17:56:58,539 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 83 transitions. [2021-07-09 17:56:58,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-07-09 17:56:58,539 INFO L500 BasicCegarLoop]: Found error trace [2021-07-09 17:56:58,539 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-09 17:56:58,752 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-09 17:56:58,753 INFO L430 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-07-09 17:56:58,753 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-09 17:56:58,753 INFO L82 PathProgramCache]: Analyzing trace with hash 770739301, now seen corresponding path program 16 times [2021-07-09 17:56:58,753 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-09 17:56:58,753 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [773411497] [2021-07-09 17:56:58,753 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-09 17:56:58,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-09 17:56:58,866 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-09 17:56:58,866 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-09 17:56:58,866 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [773411497] [2021-07-09 17:56:58,866 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [773411497] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-09 17:56:58,866 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [522188521] [2021-07-09 17:56:58,866 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 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 [2021-07-09 17:56:58,890 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-07-09 17:56:58,890 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-09 17:56:58,891 INFO L263 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 21 conjunts are in the unsatisfiable core [2021-07-09 17:56:58,891 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-09 17:56:59,142 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-09 17:56:59,142 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [522188521] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-09 17:56:59,142 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-09 17:56:59,142 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 20 [2021-07-09 17:56:59,143 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1960448412] [2021-07-09 17:56:59,143 INFO L462 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-07-09 17:56:59,143 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-09 17:56:59,143 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-07-09 17:56:59,143 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=352, Unknown=0, NotChecked=0, Total=420 [2021-07-09 17:56:59,144 INFO L87 Difference]: Start difference. First operand 47 states and 83 transitions. Second operand has 21 states, 21 states have (on average 1.9047619047619047) internal successors, (40), 20 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) [2021-07-09 17:56:59,499 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-09 17:56:59,500 INFO L93 Difference]: Finished difference Result 97 states and 165 transitions. [2021-07-09 17:56:59,500 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-07-09 17:56:59,500 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.9047619047619047) internal successors, (40), 20 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-07-09 17:56:59,500 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-09 17:56:59,500 INFO L225 Difference]: With dead ends: 97 [2021-07-09 17:56:59,500 INFO L226 Difference]: Without dead ends: 83 [2021-07-09 17:56:59,501 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 11 SyntacticMatches, 1 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 252 ImplicationChecksByTransitivity, 485.9ms TimeCoverageRelationStatistics Valid=216, Invalid=974, Unknown=0, NotChecked=0, Total=1190 [2021-07-09 17:56:59,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-07-09 17:56:59,502 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 63. [2021-07-09 17:56:59,502 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 62 states have (on average 1.8387096774193548) internal successors, (114), 62 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-09 17:56:59,502 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 114 transitions. [2021-07-09 17:56:59,502 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 114 transitions. Word has length 21 [2021-07-09 17:56:59,503 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-09 17:56:59,503 INFO L482 AbstractCegarLoop]: Abstraction has 63 states and 114 transitions. [2021-07-09 17:56:59,503 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 1.9047619047619047) internal successors, (40), 20 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) [2021-07-09 17:56:59,503 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 114 transitions. [2021-07-09 17:56:59,503 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-07-09 17:56:59,503 INFO L500 BasicCegarLoop]: Found error trace [2021-07-09 17:56:59,503 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-09 17:56:59,719 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-07-09 17:56:59,719 INFO L430 AbstractCegarLoop]: === Iteration 23 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-07-09 17:56:59,720 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-09 17:56:59,720 INFO L82 PathProgramCache]: Analyzing trace with hash -241953231, now seen corresponding path program 17 times [2021-07-09 17:56:59,720 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-09 17:56:59,720 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1675129129] [2021-07-09 17:56:59,720 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-09 17:56:59,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-09 17:56:59,814 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-09 17:56:59,814 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-09 17:56:59,814 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1675129129] [2021-07-09 17:56:59,814 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1675129129] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-09 17:56:59,814 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1503624172] [2021-07-09 17:56:59,814 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 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-09 17:56:59,839 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-07-09 17:56:59,840 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-09 17:56:59,840 INFO L263 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 20 conjunts are in the unsatisfiable core [2021-07-09 17:56:59,841 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-09 17:57:00,079 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-09 17:57:00,079 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1503624172] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-09 17:57:00,079 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-09 17:57:00,080 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 20 [2021-07-09 17:57:00,080 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1051848136] [2021-07-09 17:57:00,080 INFO L462 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-07-09 17:57:00,080 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-09 17:57:00,080 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-07-09 17:57:00,080 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=353, Unknown=0, NotChecked=0, Total=420 [2021-07-09 17:57:00,081 INFO L87 Difference]: Start difference. First operand 63 states and 114 transitions. Second operand has 21 states, 21 states have (on average 1.9047619047619047) internal successors, (40), 20 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) [2021-07-09 17:57:00,632 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-09 17:57:00,632 INFO L93 Difference]: Finished difference Result 133 states and 227 transitions. [2021-07-09 17:57:00,632 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-07-09 17:57:00,632 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.9047619047619047) internal successors, (40), 20 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-07-09 17:57:00,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-09 17:57:00,633 INFO L225 Difference]: With dead ends: 133 [2021-07-09 17:57:00,633 INFO L226 Difference]: Without dead ends: 119 [2021-07-09 17:57:00,634 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 11 SyntacticMatches, 1 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 367 ImplicationChecksByTransitivity, 618.0ms TimeCoverageRelationStatistics Valid=250, Invalid=1310, Unknown=0, NotChecked=0, Total=1560 [2021-07-09 17:57:00,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2021-07-09 17:57:00,636 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 67. [2021-07-09 17:57:00,636 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 66 states have (on average 1.9090909090909092) internal successors, (126), 66 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-09 17:57:00,636 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 126 transitions. [2021-07-09 17:57:00,636 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 126 transitions. Word has length 21 [2021-07-09 17:57:00,636 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-09 17:57:00,636 INFO L482 AbstractCegarLoop]: Abstraction has 67 states and 126 transitions. [2021-07-09 17:57:00,637 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 1.9047619047619047) internal successors, (40), 20 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) [2021-07-09 17:57:00,637 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 126 transitions. [2021-07-09 17:57:00,637 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-07-09 17:57:00,637 INFO L500 BasicCegarLoop]: Found error trace [2021-07-09 17:57:00,637 INFO L508 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-09 17:57:00,853 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-07-09 17:57:00,853 INFO L430 AbstractCegarLoop]: === Iteration 24 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-07-09 17:57:00,853 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-09 17:57:00,853 INFO L82 PathProgramCache]: Analyzing trace with hash -777183033, now seen corresponding path program 18 times [2021-07-09 17:57:00,853 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-09 17:57:00,854 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2111044034] [2021-07-09 17:57:00,854 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-09 17:57:00,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-09 17:57:00,956 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-09 17:57:00,957 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-09 17:57:00,957 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2111044034] [2021-07-09 17:57:00,957 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2111044034] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-09 17:57:00,957 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1700783631] [2021-07-09 17:57:00,957 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 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-09 17:57:00,978 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-07-09 17:57:00,978 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-09 17:57:00,979 INFO L263 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 20 conjunts are in the unsatisfiable core [2021-07-09 17:57:00,979 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-09 17:57:01,206 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-09 17:57:01,206 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1700783631] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-09 17:57:01,206 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-09 17:57:01,206 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 20 [2021-07-09 17:57:01,206 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [308582346] [2021-07-09 17:57:01,206 INFO L462 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-07-09 17:57:01,206 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-09 17:57:01,207 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-07-09 17:57:01,207 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=354, Unknown=0, NotChecked=0, Total=420 [2021-07-09 17:57:01,207 INFO L87 Difference]: Start difference. First operand 67 states and 126 transitions. Second operand has 21 states, 21 states have (on average 1.9047619047619047) internal successors, (40), 20 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) [2021-07-09 17:57:01,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-09 17:57:01,711 INFO L93 Difference]: Finished difference Result 111 states and 193 transitions. [2021-07-09 17:57:01,711 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-07-09 17:57:01,711 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.9047619047619047) internal successors, (40), 20 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-07-09 17:57:01,711 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-09 17:57:01,712 INFO L225 Difference]: With dead ends: 111 [2021-07-09 17:57:01,712 INFO L226 Difference]: Without dead ends: 73 [2021-07-09 17:57:01,712 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 11 SyntacticMatches, 1 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 258 ImplicationChecksByTransitivity, 576.9ms TimeCoverageRelationStatistics Valid=205, Invalid=1055, Unknown=0, NotChecked=0, Total=1260 [2021-07-09 17:57:01,712 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2021-07-09 17:57:01,714 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 57. [2021-07-09 17:57:01,714 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 56 states have (on average 1.7678571428571428) internal successors, (99), 56 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) [2021-07-09 17:57:01,714 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 99 transitions. [2021-07-09 17:57:01,714 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 99 transitions. Word has length 21 [2021-07-09 17:57:01,714 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-09 17:57:01,714 INFO L482 AbstractCegarLoop]: Abstraction has 57 states and 99 transitions. [2021-07-09 17:57:01,714 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 1.9047619047619047) internal successors, (40), 20 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) [2021-07-09 17:57:01,714 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 99 transitions. [2021-07-09 17:57:01,715 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-07-09 17:57:01,715 INFO L500 BasicCegarLoop]: Found error trace [2021-07-09 17:57:01,715 INFO L508 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-09 17:57:01,920 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-09 17:57:01,921 INFO L430 AbstractCegarLoop]: === Iteration 25 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-07-09 17:57:01,921 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-09 17:57:01,921 INFO L82 PathProgramCache]: Analyzing trace with hash -2078233109, now seen corresponding path program 19 times [2021-07-09 17:57:01,921 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-09 17:57:01,921 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [792726469] [2021-07-09 17:57:01,921 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-09 17:57:01,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-09 17:57:02,020 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-07-09 17:57:02,020 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-09 17:57:02,020 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [792726469] [2021-07-09 17:57:02,020 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [792726469] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-09 17:57:02,020 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1309852567] [2021-07-09 17:57:02,020 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 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-09 17:57:02,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-09 17:57:02,047 WARN L261 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 25 conjunts are in the unsatisfiable core [2021-07-09 17:57:02,047 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-09 17:57:02,288 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-09 17:57:02,288 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1309852567] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-09 17:57:02,288 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-09 17:57:02,288 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 12] total 20 [2021-07-09 17:57:02,288 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [857552043] [2021-07-09 17:57:02,288 INFO L462 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-07-09 17:57:02,288 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-09 17:57:02,289 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-07-09 17:57:02,289 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=351, Unknown=0, NotChecked=0, Total=420 [2021-07-09 17:57:02,289 INFO L87 Difference]: Start difference. First operand 57 states and 99 transitions. Second operand has 21 states, 21 states have (on average 2.0) internal successors, (42), 20 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-09 17:57:02,778 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-09 17:57:02,778 INFO L93 Difference]: Finished difference Result 109 states and 188 transitions. [2021-07-09 17:57:02,778 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-07-09 17:57:02,779 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 2.0) internal successors, (42), 20 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2021-07-09 17:57:02,779 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-09 17:57:02,779 INFO L225 Difference]: With dead ends: 109 [2021-07-09 17:57:02,779 INFO L226 Difference]: Without dead ends: 95 [2021-07-09 17:57:02,780 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 423 ImplicationChecksByTransitivity, 602.1ms TimeCoverageRelationStatistics Valid=266, Invalid=1374, Unknown=0, NotChecked=0, Total=1640 [2021-07-09 17:57:02,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2021-07-09 17:57:02,781 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 61. [2021-07-09 17:57:02,781 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 60 states have (on average 1.7833333333333334) internal successors, (107), 60 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) [2021-07-09 17:57:02,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 107 transitions. [2021-07-09 17:57:02,781 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 107 transitions. Word has length 23 [2021-07-09 17:57:02,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-09 17:57:02,782 INFO L482 AbstractCegarLoop]: Abstraction has 61 states and 107 transitions. [2021-07-09 17:57:02,782 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 2.0) internal successors, (42), 20 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-09 17:57:02,782 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 107 transitions. [2021-07-09 17:57:02,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-07-09 17:57:02,782 INFO L500 BasicCegarLoop]: Found error trace [2021-07-09 17:57:02,782 INFO L508 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-09 17:57:02,989 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-07-09 17:57:02,989 INFO L430 AbstractCegarLoop]: === Iteration 26 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-07-09 17:57:02,989 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-09 17:57:02,989 INFO L82 PathProgramCache]: Analyzing trace with hash 1330935907, now seen corresponding path program 20 times [2021-07-09 17:57:02,989 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-09 17:57:02,989 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [602774574] [2021-07-09 17:57:02,989 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-09 17:57:02,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-09 17:57:03,089 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-07-09 17:57:03,089 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-09 17:57:03,089 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [602774574] [2021-07-09 17:57:03,090 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [602774574] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-09 17:57:03,090 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1116031271] [2021-07-09 17:57:03,090 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 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-09 17:57:03,116 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-07-09 17:57:03,116 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-09 17:57:03,117 WARN L261 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 25 conjunts are in the unsatisfiable core [2021-07-09 17:57:03,117 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-09 17:57:03,364 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-09 17:57:03,365 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1116031271] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-09 17:57:03,365 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-09 17:57:03,365 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 12] total 20 [2021-07-09 17:57:03,365 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1407304732] [2021-07-09 17:57:03,366 INFO L462 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-07-09 17:57:03,366 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-09 17:57:03,366 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-07-09 17:57:03,367 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=351, Unknown=0, NotChecked=0, Total=420 [2021-07-09 17:57:03,367 INFO L87 Difference]: Start difference. First operand 61 states and 107 transitions. Second operand has 21 states, 21 states have (on average 2.0) internal successors, (42), 20 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-09 17:57:03,919 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-09 17:57:03,919 INFO L93 Difference]: Finished difference Result 120 states and 210 transitions. [2021-07-09 17:57:03,920 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-07-09 17:57:03,920 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 2.0) internal successors, (42), 20 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2021-07-09 17:57:03,920 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-09 17:57:03,920 INFO L225 Difference]: With dead ends: 120 [2021-07-09 17:57:03,920 INFO L226 Difference]: Without dead ends: 106 [2021-07-09 17:57:03,921 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 628.9ms TimeCoverageRelationStatistics Valid=254, Invalid=1386, Unknown=0, NotChecked=0, Total=1640 [2021-07-09 17:57:03,921 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2021-07-09 17:57:03,922 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 61. [2021-07-09 17:57:03,923 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 60 states have (on average 1.8) internal successors, (108), 60 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-09 17:57:03,923 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 108 transitions. [2021-07-09 17:57:03,923 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 108 transitions. Word has length 23 [2021-07-09 17:57:03,923 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-09 17:57:03,923 INFO L482 AbstractCegarLoop]: Abstraction has 61 states and 108 transitions. [2021-07-09 17:57:03,923 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 2.0) internal successors, (42), 20 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-09 17:57:03,923 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 108 transitions. [2021-07-09 17:57:03,924 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-07-09 17:57:03,924 INFO L500 BasicCegarLoop]: Found error trace [2021-07-09 17:57:03,924 INFO L508 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-09 17:57:04,132 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-09 17:57:04,133 INFO L430 AbstractCegarLoop]: === Iteration 27 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-07-09 17:57:04,133 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-09 17:57:04,133 INFO L82 PathProgramCache]: Analyzing trace with hash 318243375, now seen corresponding path program 21 times [2021-07-09 17:57:04,133 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-09 17:57:04,133 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [68977895] [2021-07-09 17:57:04,133 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-09 17:57:04,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-09 17:57:04,235 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-07-09 17:57:04,236 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-09 17:57:04,236 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [68977895] [2021-07-09 17:57:04,236 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [68977895] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-09 17:57:04,236 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1169664009] [2021-07-09 17:57:04,237 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 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-09 17:57:04,272 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-07-09 17:57:04,272 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-09 17:57:04,273 WARN L261 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 25 conjunts are in the unsatisfiable core [2021-07-09 17:57:04,273 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-09 17:57:04,511 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-09 17:57:04,511 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1169664009] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-09 17:57:04,512 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-09 17:57:04,512 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 12] total 20 [2021-07-09 17:57:04,512 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1883739495] [2021-07-09 17:57:04,512 INFO L462 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-07-09 17:57:04,512 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-09 17:57:04,512 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-07-09 17:57:04,513 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=354, Unknown=0, NotChecked=0, Total=420 [2021-07-09 17:57:04,513 INFO L87 Difference]: Start difference. First operand 61 states and 108 transitions. Second operand has 21 states, 21 states have (on average 2.0) internal successors, (42), 20 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-09 17:57:05,349 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-09 17:57:05,349 INFO L93 Difference]: Finished difference Result 116 states and 202 transitions. [2021-07-09 17:57:05,349 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-07-09 17:57:05,349 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 2.0) internal successors, (42), 20 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2021-07-09 17:57:05,349 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-09 17:57:05,350 INFO L225 Difference]: With dead ends: 116 [2021-07-09 17:57:05,350 INFO L226 Difference]: Without dead ends: 102 [2021-07-09 17:57:05,350 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 744 ImplicationChecksByTransitivity, 915.4ms TimeCoverageRelationStatistics Valid=406, Invalid=2246, Unknown=0, NotChecked=0, Total=2652 [2021-07-09 17:57:05,351 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2021-07-09 17:57:05,352 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 59. [2021-07-09 17:57:05,352 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 58 states have (on average 1.7586206896551724) internal successors, (102), 58 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-09 17:57:05,352 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 102 transitions. [2021-07-09 17:57:05,353 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 102 transitions. Word has length 23 [2021-07-09 17:57:05,353 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-09 17:57:05,353 INFO L482 AbstractCegarLoop]: Abstraction has 59 states and 102 transitions. [2021-07-09 17:57:05,353 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 2.0) internal successors, (42), 20 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-09 17:57:05,353 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 102 transitions. [2021-07-09 17:57:05,353 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-07-09 17:57:05,353 INFO L500 BasicCegarLoop]: Found error trace [2021-07-09 17:57:05,353 INFO L508 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-07-09 17:57:05,560 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-07-09 17:57:05,561 INFO L430 AbstractCegarLoop]: === Iteration 28 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-07-09 17:57:05,561 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-07-09 17:57:05,561 INFO L82 PathProgramCache]: Analyzing trace with hash -216986427, now seen corresponding path program 22 times [2021-07-09 17:57:05,561 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-07-09 17:57:05,561 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1675231586] [2021-07-09 17:57:05,561 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-07-09 17:57:05,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-07-09 17:57:05,645 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-07-09 17:57:05,645 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-07-09 17:57:05,645 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1675231586] [2021-07-09 17:57:05,646 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1675231586] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-09 17:57:05,646 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [356435126] [2021-07-09 17:57:05,646 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 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-07-09 17:57:05,667 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-07-09 17:57:05,667 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-07-09 17:57:05,667 WARN L261 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 25 conjunts are in the unsatisfiable core [2021-07-09 17:57:05,668 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-07-09 17:57:05,874 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-07-09 17:57:05,874 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [356435126] provided 0 perfect and 1 imperfect interpolant sequences [2021-07-09 17:57:05,874 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-07-09 17:57:05,874 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 12] total 20 [2021-07-09 17:57:05,874 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [969868150] [2021-07-09 17:57:05,874 INFO L462 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-07-09 17:57:05,874 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-07-09 17:57:05,875 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-07-09 17:57:05,875 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=354, Unknown=0, NotChecked=0, Total=420 [2021-07-09 17:57:05,875 INFO L87 Difference]: Start difference. First operand 59 states and 102 transitions. Second operand has 21 states, 21 states have (on average 2.0) internal successors, (42), 20 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-09 17:57:06,533 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-07-09 17:57:06,533 INFO L93 Difference]: Finished difference Result 92 states and 163 transitions. [2021-07-09 17:57:06,533 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-07-09 17:57:06,533 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 2.0) internal successors, (42), 20 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2021-07-09 17:57:06,533 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-07-09 17:57:06,533 INFO L225 Difference]: With dead ends: 92 [2021-07-09 17:57:06,534 INFO L226 Difference]: Without dead ends: 0 [2021-07-09 17:57:06,534 INFO L764 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 393 ImplicationChecksByTransitivity, 661.8ms TimeCoverageRelationStatistics Valid=260, Invalid=1380, Unknown=0, NotChecked=0, Total=1640 [2021-07-09 17:57:06,534 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-07-09 17:57:06,534 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-07-09 17:57:06,534 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-09 17:57:06,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-07-09 17:57:06,535 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 23 [2021-07-09 17:57:06,535 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-07-09 17:57:06,535 INFO L482 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-07-09 17:57:06,535 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 2.0) internal successors, (42), 20 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-07-09 17:57:06,535 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-07-09 17:57:06,535 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-07-09 17:57:06,748 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-07-09 17:57:06,751 INFO L247 ceAbstractionStarter]: Analysis of concurrent program completed with 1 thread instances [2021-07-09 17:57:06,752 INFO L202 PluginConnector]: Adding new model figure1-alt.wvr.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 09.07 05:57:06 BasicIcfg [2021-07-09 17:57:06,753 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-07-09 17:57:06,753 INFO L168 Benchmark]: Toolchain (without parser) took 30644.94 ms. Allocated memory was 181.4 MB in the beginning and 262.1 MB in the end (delta: 80.7 MB). Free memory was 161.8 MB in the beginning and 163.7 MB in the end (delta: -1.9 MB). Peak memory consumption was 79.4 MB. Max. memory is 8.0 GB. [2021-07-09 17:57:06,753 INFO L168 Benchmark]: Boogie PL CUP Parser took 0.15 ms. Allocated memory is still 181.4 MB. Free memory is still 162.8 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-07-09 17:57:06,753 INFO L168 Benchmark]: Boogie Procedure Inliner took 48.57 ms. Allocated memory is still 181.4 MB. Free memory was 161.8 MB in the beginning and 160.3 MB in the end (delta: 1.5 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2021-07-09 17:57:06,753 INFO L168 Benchmark]: Boogie Preprocessor took 21.64 ms. Allocated memory is still 181.4 MB. Free memory was 160.3 MB in the beginning and 159.4 MB in the end (delta: 923.9 kB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2021-07-09 17:57:06,753 INFO L168 Benchmark]: RCFGBuilder took 426.37 ms. Allocated memory is still 181.4 MB. Free memory was 159.2 MB in the beginning and 147.7 MB in the end (delta: 11.6 MB). Peak memory consumption was 11.5 MB. Max. memory is 8.0 GB. [2021-07-09 17:57:06,753 INFO L168 Benchmark]: TraceAbstraction took 30106.25 ms. Allocated memory was 181.4 MB in the beginning and 262.1 MB in the end (delta: 80.7 MB). Free memory was 147.1 MB in the beginning and 163.7 MB in the end (delta: -16.6 MB). Peak memory consumption was 64.8 MB. Max. memory is 8.0 GB. [2021-07-09 17:57:06,753 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * Boogie PL CUP Parser took 0.15 ms. Allocated memory is still 181.4 MB. Free memory is still 162.8 MB. There was no memory consumed. Max. memory is 8.0 GB. * Boogie Procedure Inliner took 48.57 ms. Allocated memory is still 181.4 MB. Free memory was 161.8 MB in the beginning and 160.3 MB in the end (delta: 1.5 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 21.64 ms. Allocated memory is still 181.4 MB. Free memory was 160.3 MB in the beginning and 159.4 MB in the end (delta: 923.9 kB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * RCFGBuilder took 426.37 ms. Allocated memory is still 181.4 MB. Free memory was 159.2 MB in the beginning and 147.7 MB in the end (delta: 11.6 MB). Peak memory consumption was 11.5 MB. Max. memory is 8.0 GB. * TraceAbstraction took 30106.25 ms. Allocated memory was 181.4 MB in the beginning and 262.1 MB in the end (delta: 80.7 MB). Free memory was 147.1 MB in the beginning and 163.7 MB in the end (delta: -16.6 MB). Peak memory consumption was 64.8 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 51]: assertion always holds For all program executions holds that assertion always holds at this location - StatisticsResult: Ultimate Automizer benchmark data for errors in thread instance: ULTIMATE.start with 1 thread instances CFG has 5 procedures, 32 locations, 3 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 30016.8ms, OverallIterations: 28, TraceHistogramMax: 3, EmptinessCheckTime: 25.0ms, AutomataDifference: 13657.6ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 21.1ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 546 SDtfs, 2891 SDslu, 3840 SDs, 0 SdLazy, 7124 SolverSat, 424 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 3291.6ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 1218 GetRequests, 289 SyntacticMatches, 26 SemanticMatches, 903 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8019 ImplicationChecksByTransitivity, 15820.2ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=67occurred in iteration=10, InterpolantAutomatonStates: 642, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 129.6ms AutomataMinimizationTime, 28 MinimizatonAttempts, 848 StatesRemovedByMinimization, 27 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 82.6ms SsaConstructionTime, 274.3ms SatisfiabilityAnalysisTime, 9605.5ms InterpolantComputationTime, 1078 NumberOfCodeBlocks, 1078 NumberOfCodeBlocksAsserted, 82 NumberOfCheckSat, 1024 ConstructedInterpolants, 0 QuantifiedInterpolants, 12797 SizeOfPredicates, 130 NumberOfNonLiveVariables, 1085 ConjunctsInSsa, 496 ConjunctsInUnsatCore, 54 InterpolantComputations, 2 PerfectInterpolantSequences, 14/226 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold RESULT: Ultimate proved your program to be correct! Received shutdown request...