/usr/bin/java -Xmx16000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -s ../../../trunk/examples/settings/automizer/concurrent/svcomp-Reach-32bit-Automizer_Default-noMmResRef-FA-NoLbe.epf -tc ../../../trunk/examples/toolchains/AutomizerBplInline.xml -i ../../../trunk/examples/concurrent/bpl/weaver-benchmarks/generated/popl20-proofs/counter-mul-4-semi-NZZ.wvr.bpl -------------------------------------------------------------------------------- This is Ultimate 0.2.1-a865e3bea3ade1065a4c95009cfa501fe03c5538-a865e3b [2021-02-19 19:50:55,239 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-02-19 19:50:55,241 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-02-19 19:50:55,279 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-02-19 19:50:55,334 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/concurrent/svcomp-Reach-32bit-Automizer_Default-noMmResRef-FA-NoLbe.epf [2021-02-19 19:50:55,368 INFO L113 SettingsManager]: Loading preferences was successful [2021-02-19 19:50:55,369 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-02-19 19:50:55,369 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-02-19 19:50:55,369 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-02-19 19:50:55,372 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-02-19 19:50:55,372 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-02-19 19:50:55,372 INFO L138 SettingsManager]: * Use SBE=true [2021-02-19 19:50:55,372 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-02-19 19:50:55,373 INFO L138 SettingsManager]: * sizeof long=4 [2021-02-19 19:50:55,373 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-02-19 19:50:55,374 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-02-19 19:50:55,374 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-02-19 19:50:55,374 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-02-19 19:50:55,374 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-02-19 19:50:55,374 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-02-19 19:50:55,374 INFO L138 SettingsManager]: * sizeof long double=12 [2021-02-19 19:50:55,375 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-02-19 19:50:55,375 INFO L138 SettingsManager]: * Use constant arrays=true [2021-02-19 19:50:55,375 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-02-19 19:50:55,375 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-02-19 19:50:55,375 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-02-19 19:50:55,375 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-02-19 19:50:55,375 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-02-19 19:50:55,376 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-02-19 19:50:55,376 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-02-19 19:50:55,376 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-02-19 19:50:55,376 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-02-19 19:50:55,376 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-02-19 19:50:55,376 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-02-19 19:50:55,377 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-02-19 19:50:55,377 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-02-19 19:50:55,377 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-02-19 19:50:55,697 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-02-19 19:50:55,723 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-02-19 19:50:55,725 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-02-19 19:50:55,726 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2021-02-19 19:50:55,727 INFO L275 PluginConnector]: Boogie PL CUP Parser initialized [2021-02-19 19:50:55,728 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/weaver-benchmarks/generated/popl20-proofs/counter-mul-4-semi-NZZ.wvr.bpl [2021-02-19 19:50:55,728 INFO L110 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/weaver-benchmarks/generated/popl20-proofs/counter-mul-4-semi-NZZ.wvr.bpl' [2021-02-19 19:50:55,766 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-02-19 19:50:55,771 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-02-19 19:50:55,772 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-02-19 19:50:55,772 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-02-19 19:50:55,772 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-02-19 19:50:55,785 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "counter-mul-4-semi-NZZ.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 19.02 07:50:55" (1/1) ... [2021-02-19 19:50:55,792 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "counter-mul-4-semi-NZZ.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 19.02 07:50:55" (1/1) ... [2021-02-19 19:50:55,798 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-02-19 19:50:55,799 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-02-19 19:50:55,799 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-02-19 19:50:55,800 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-02-19 19:50:55,806 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "counter-mul-4-semi-NZZ.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 19.02 07:50:55" (1/1) ... [2021-02-19 19:50:55,806 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "counter-mul-4-semi-NZZ.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 19.02 07:50:55" (1/1) ... [2021-02-19 19:50:55,807 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "counter-mul-4-semi-NZZ.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 19.02 07:50:55" (1/1) ... [2021-02-19 19:50:55,807 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "counter-mul-4-semi-NZZ.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 19.02 07:50:55" (1/1) ... [2021-02-19 19:50:55,811 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "counter-mul-4-semi-NZZ.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 19.02 07:50:55" (1/1) ... [2021-02-19 19:50:55,816 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "counter-mul-4-semi-NZZ.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 19.02 07:50:55" (1/1) ... [2021-02-19 19:50:55,817 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "counter-mul-4-semi-NZZ.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 19.02 07:50:55" (1/1) ... [2021-02-19 19:50:55,820 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-02-19 19:50:55,821 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-02-19 19:50:55,821 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-02-19 19:50:55,821 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-02-19 19:50:55,823 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "counter-mul-4-semi-NZZ.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 19.02 07:50:55" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-02-19 19:50:55,891 INFO L124 BoogieDeclarations]: Specification and implementation of procedure thread1 given in one single declaration [2021-02-19 19:50:55,891 INFO L130 BoogieDeclarations]: Found specification of procedure thread1 [2021-02-19 19:50:55,891 INFO L138 BoogieDeclarations]: Found implementation of procedure thread1 [2021-02-19 19:50:55,892 INFO L124 BoogieDeclarations]: Specification and implementation of procedure thread2 given in one single declaration [2021-02-19 19:50:55,892 INFO L130 BoogieDeclarations]: Found specification of procedure thread2 [2021-02-19 19:50:55,892 INFO L138 BoogieDeclarations]: Found implementation of procedure thread2 [2021-02-19 19:50:55,892 INFO L124 BoogieDeclarations]: Specification and implementation of procedure ULTIMATE.start given in one single declaration [2021-02-19 19:50:55,892 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-02-19 19:50:55,892 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-02-19 19:50:55,892 INFO L124 BoogieDeclarations]: Specification and implementation of procedure thread3 given in one single declaration [2021-02-19 19:50:55,892 INFO L130 BoogieDeclarations]: Found specification of procedure thread3 [2021-02-19 19:50:55,892 INFO L138 BoogieDeclarations]: Found implementation of procedure thread3 [2021-02-19 19:50:55,894 INFO L124 BoogieDeclarations]: Specification and implementation of procedure thread4 given in one single declaration [2021-02-19 19:50:55,894 INFO L130 BoogieDeclarations]: Found specification of procedure thread4 [2021-02-19 19:50:55,894 INFO L138 BoogieDeclarations]: Found implementation of procedure thread4 [2021-02-19 19:50:55,894 WARN L209 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to SingleStatement [2021-02-19 19:50:56,133 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-02-19 19:50:56,134 INFO L299 CfgBuilder]: Removed 0 assume(true) statements. [2021-02-19 19:50:56,135 INFO L202 PluginConnector]: Adding new model counter-mul-4-semi-NZZ.wvr.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.02 07:50:56 BoogieIcfgContainer [2021-02-19 19:50:56,135 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-02-19 19:50:56,137 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-02-19 19:50:56,137 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-02-19 19:50:56,139 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-02-19 19:50:56,139 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "counter-mul-4-semi-NZZ.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 19.02 07:50:55" (1/2) ... [2021-02-19 19:50:56,140 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@126af0f6 and model type counter-mul-4-semi-NZZ.wvr.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.02 07:50:56, skipping insertion in model container [2021-02-19 19:50:56,140 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "counter-mul-4-semi-NZZ.wvr.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.02 07:50:56" (2/2) ... [2021-02-19 19:50:56,141 INFO L111 eAbstractionObserver]: Analyzing ICFG counter-mul-4-semi-NZZ.wvr.bpl [2021-02-19 19:50:56,145 WARN L142 ceAbstractionStarter]: Switching off computation of Hoare annotation because input is a concurrent program [2021-02-19 19:50:56,145 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-02-19 19:50:56,162 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-02-19 19:50:56,162 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2021-02-19 19:50:56,196 INFO L149 ThreadInstanceAdder]: Constructed 4 joinOtherThreadTransitions. [2021-02-19 19:50:56,210 INFO L253 AbstractCegarLoop]: Starting to check reachability of 5 error locations. [2021-02-19 19:50:56,224 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-02-19 19:50:56,224 INFO L377 AbstractCegarLoop]: Hoare is true [2021-02-19 19:50:56,224 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-02-19 19:50:56,224 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-02-19 19:50:56,224 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-02-19 19:50:56,224 INFO L381 AbstractCegarLoop]: Difference is false [2021-02-19 19:50:56,225 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-02-19 19:50:56,225 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-02-19 19:50:56,232 INFO L100 iNet2FiniteAutomaton]: Start petriNet2FiniteAutomaton. Operand has 45 places, 36 transitions, 104 flow [2021-02-19 19:50:56,285 INFO L122 iNet2FiniteAutomaton]: Finished petriNet2FiniteAutomaton. Result has 434 states, 432 states have (on average 3.837962962962963) internal successors, (1658), 433 states have internal predecessors, (1658), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:50:56,287 INFO L276 IsEmpty]: Start isEmpty. Operand has 434 states, 432 states have (on average 3.837962962962963) internal successors, (1658), 433 states have internal predecessors, (1658), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:50:56,301 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-02-19 19:50:56,301 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 19:50:56,302 INFO L506 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 19:50:56,302 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr3INUSE_VIOLATION, ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 19:50:56,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 19:50:56,308 INFO L82 PathProgramCache]: Analyzing trace with hash -975342398, now seen corresponding path program 1 times [2021-02-19 19:50:56,315 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 19:50:56,315 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1808629691] [2021-02-19 19:50:56,315 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 19:50:56,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:50:56,434 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:50:56,434 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1808629691] [2021-02-19 19:50:56,435 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-02-19 19:50:56,435 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-02-19 19:50:56,435 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2014531579] [2021-02-19 19:50:56,439 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-02-19 19:50:56,439 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 19:50:56,448 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-02-19 19:50:56,449 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-02-19 19:50:56,451 INFO L87 Difference]: Start difference. First operand has 434 states, 432 states have (on average 3.837962962962963) internal successors, (1658), 433 states have internal predecessors, (1658), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 7.333333333333333) internal successors, (22), 3 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:50:56,501 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 19:50:56,502 INFO L93 Difference]: Finished difference Result 857 states and 3120 transitions. [2021-02-19 19:50:56,502 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-02-19 19:50:56,503 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 7.333333333333333) internal successors, (22), 3 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-02-19 19:50:56,503 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 19:50:56,522 INFO L225 Difference]: With dead ends: 857 [2021-02-19 19:50:56,522 INFO L226 Difference]: Without dead ends: 732 [2021-02-19 19:50:56,524 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-02-19 19:50:56,539 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 732 states. [2021-02-19 19:50:56,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 732 to 698. [2021-02-19 19:50:56,597 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 698 states, 697 states have (on average 3.720229555236729) internal successors, (2593), 697 states have internal predecessors, (2593), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:50:56,602 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 698 states to 698 states and 2593 transitions. [2021-02-19 19:50:56,603 INFO L78 Accepts]: Start accepts. Automaton has 698 states and 2593 transitions. Word has length 22 [2021-02-19 19:50:56,604 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 19:50:56,604 INFO L480 AbstractCegarLoop]: Abstraction has 698 states and 2593 transitions. [2021-02-19 19:50:56,604 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 7.333333333333333) internal successors, (22), 3 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:50:56,605 INFO L276 IsEmpty]: Start isEmpty. Operand 698 states and 2593 transitions. [2021-02-19 19:50:56,610 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-02-19 19:50:56,610 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 19:50:56,610 INFO L506 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 19:50:56,610 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-02-19 19:50:56,611 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr3INUSE_VIOLATION, ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 19:50:56,611 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 19:50:56,611 INFO L82 PathProgramCache]: Analyzing trace with hash 429900544, now seen corresponding path program 1 times [2021-02-19 19:50:56,612 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 19:50:56,612 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [716701069] [2021-02-19 19:50:56,612 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 19:50:56,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:50:56,758 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:50:56,758 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [716701069] [2021-02-19 19:50:56,758 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [199951911] [2021-02-19 19:50:56,758 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 19:50:56,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:50:56,819 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 4 conjunts are in the unsatisfiable core [2021-02-19 19:50:56,825 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 19:50:56,983 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:50:56,983 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 19:50:56,983 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 4] total 8 [2021-02-19 19:50:56,984 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1475410224] [2021-02-19 19:50:56,985 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-02-19 19:50:56,985 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 19:50:56,986 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-02-19 19:50:56,986 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2021-02-19 19:50:56,986 INFO L87 Difference]: Start difference. First operand 698 states and 2593 transitions. Second operand has 9 states, 9 states have (on average 3.5555555555555554) internal successors, (32), 8 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:50:57,115 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 19:50:57,115 INFO L93 Difference]: Finished difference Result 1528 states and 5659 transitions. [2021-02-19 19:50:57,116 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-02-19 19:50:57,116 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.5555555555555554) internal successors, (32), 8 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-02-19 19:50:57,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 19:50:57,127 INFO L225 Difference]: With dead ends: 1528 [2021-02-19 19:50:57,127 INFO L226 Difference]: Without dead ends: 1528 [2021-02-19 19:50:57,128 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 21 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=34, Invalid=56, Unknown=0, NotChecked=0, Total=90 [2021-02-19 19:50:57,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1528 states. [2021-02-19 19:50:57,172 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1528 to 838. [2021-02-19 19:50:57,174 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 838 states, 837 states have (on average 3.771804062126643) internal successors, (3157), 837 states have internal predecessors, (3157), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:50:57,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 838 states to 838 states and 3157 transitions. [2021-02-19 19:50:57,179 INFO L78 Accepts]: Start accepts. Automaton has 838 states and 3157 transitions. Word has length 24 [2021-02-19 19:50:57,180 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 19:50:57,180 INFO L480 AbstractCegarLoop]: Abstraction has 838 states and 3157 transitions. [2021-02-19 19:50:57,180 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 3.5555555555555554) internal successors, (32), 8 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:50:57,180 INFO L276 IsEmpty]: Start isEmpty. Operand 838 states and 3157 transitions. [2021-02-19 19:50:57,184 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-02-19 19:50:57,184 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 19:50:57,185 INFO L506 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 19:50:57,402 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-02-19 19:50:57,402 INFO L428 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr3INUSE_VIOLATION, ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 19:50:57,404 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 19:50:57,404 INFO L82 PathProgramCache]: Analyzing trace with hash -138850172, now seen corresponding path program 1 times [2021-02-19 19:50:57,404 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 19:50:57,405 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1234246590] [2021-02-19 19:50:57,405 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 19:50:57,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:50:57,496 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:50:57,496 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1234246590] [2021-02-19 19:50:57,496 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-02-19 19:50:57,497 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-02-19 19:50:57,497 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1415783253] [2021-02-19 19:50:57,497 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-02-19 19:50:57,497 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 19:50:57,499 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-02-19 19:50:57,499 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-02-19 19:50:57,500 INFO L87 Difference]: Start difference. First operand 838 states and 3157 transitions. Second operand has 6 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:50:57,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 19:50:57,575 INFO L93 Difference]: Finished difference Result 1187 states and 4245 transitions. [2021-02-19 19:50:57,575 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-02-19 19:50:57,576 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-02-19 19:50:57,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 19:50:57,585 INFO L225 Difference]: With dead ends: 1187 [2021-02-19 19:50:57,585 INFO L226 Difference]: Without dead ends: 1077 [2021-02-19 19:50:57,590 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-02-19 19:50:57,593 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1077 states. [2021-02-19 19:50:57,612 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1077 to 806. [2021-02-19 19:50:57,614 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 806 states, 805 states have (on average 3.7950310559006213) internal successors, (3055), 805 states have internal predecessors, (3055), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:50:57,619 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 806 states to 806 states and 3055 transitions. [2021-02-19 19:50:57,619 INFO L78 Accepts]: Start accepts. Automaton has 806 states and 3055 transitions. Word has length 24 [2021-02-19 19:50:57,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 19:50:57,619 INFO L480 AbstractCegarLoop]: Abstraction has 806 states and 3055 transitions. [2021-02-19 19:50:57,619 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:50:57,619 INFO L276 IsEmpty]: Start isEmpty. Operand 806 states and 3055 transitions. [2021-02-19 19:50:57,622 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-02-19 19:50:57,622 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 19:50:57,622 INFO L506 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 19:50:57,622 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-02-19 19:50:57,622 INFO L428 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr3INUSE_VIOLATION, ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 19:50:57,623 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 19:50:57,623 INFO L82 PathProgramCache]: Analyzing trace with hash -399595232, now seen corresponding path program 2 times [2021-02-19 19:50:57,624 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 19:50:57,624 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1952370815] [2021-02-19 19:50:57,624 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 19:50:57,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:50:57,684 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:50:57,684 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1952370815] [2021-02-19 19:50:57,684 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-02-19 19:50:57,684 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-02-19 19:50:57,685 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1142267443] [2021-02-19 19:50:57,685 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-02-19 19:50:57,685 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 19:50:57,699 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-02-19 19:50:57,699 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-02-19 19:50:57,700 INFO L87 Difference]: Start difference. First operand 806 states and 3055 transitions. Second operand has 5 states, 5 states have (on average 4.8) internal successors, (24), 4 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:50:57,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 19:50:57,736 INFO L93 Difference]: Finished difference Result 1023 states and 3746 transitions. [2021-02-19 19:50:57,736 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-02-19 19:50:57,736 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.8) internal successors, (24), 4 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-02-19 19:50:57,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 19:50:57,742 INFO L225 Difference]: With dead ends: 1023 [2021-02-19 19:50:57,742 INFO L226 Difference]: Without dead ends: 1023 [2021-02-19 19:50:57,743 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-02-19 19:50:57,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1023 states. [2021-02-19 19:50:57,763 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1023 to 848. [2021-02-19 19:50:57,765 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 848 states, 847 states have (on average 3.7485242030696577) internal successors, (3175), 847 states have internal predecessors, (3175), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:50:57,769 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 848 states to 848 states and 3175 transitions. [2021-02-19 19:50:57,769 INFO L78 Accepts]: Start accepts. Automaton has 848 states and 3175 transitions. Word has length 24 [2021-02-19 19:50:57,769 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 19:50:57,769 INFO L480 AbstractCegarLoop]: Abstraction has 848 states and 3175 transitions. [2021-02-19 19:50:57,769 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 4.8) internal successors, (24), 4 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:50:57,769 INFO L276 IsEmpty]: Start isEmpty. Operand 848 states and 3175 transitions. [2021-02-19 19:50:57,771 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-02-19 19:50:57,772 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 19:50:57,772 INFO L506 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 19:50:57,772 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-02-19 19:50:57,772 INFO L428 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr3INUSE_VIOLATION, ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 19:50:57,772 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 19:50:57,772 INFO L82 PathProgramCache]: Analyzing trace with hash 228689512, now seen corresponding path program 2 times [2021-02-19 19:50:57,773 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 19:50:57,773 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [941038648] [2021-02-19 19:50:57,773 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 19:50:57,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:50:57,801 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:50:57,801 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [941038648] [2021-02-19 19:50:57,801 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-02-19 19:50:57,802 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-02-19 19:50:57,802 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1668460115] [2021-02-19 19:50:57,802 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-02-19 19:50:57,802 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 19:50:57,802 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-02-19 19:50:57,803 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-02-19 19:50:57,803 INFO L87 Difference]: Start difference. First operand 848 states and 3175 transitions. Second operand has 5 states, 5 states have (on average 4.8) internal successors, (24), 4 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:50:57,840 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 19:50:57,841 INFO L93 Difference]: Finished difference Result 1118 states and 4122 transitions. [2021-02-19 19:50:57,841 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-02-19 19:50:57,841 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.8) internal successors, (24), 4 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-02-19 19:50:57,841 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 19:50:57,847 INFO L225 Difference]: With dead ends: 1118 [2021-02-19 19:50:57,847 INFO L226 Difference]: Without dead ends: 1048 [2021-02-19 19:50:57,848 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-02-19 19:50:57,851 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1048 states. [2021-02-19 19:50:57,868 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1048 to 860. [2021-02-19 19:50:57,870 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 860 states, 859 states have (on average 3.7671711292200234) internal successors, (3236), 859 states have internal predecessors, (3236), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:50:57,874 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 860 states to 860 states and 3236 transitions. [2021-02-19 19:50:57,874 INFO L78 Accepts]: Start accepts. Automaton has 860 states and 3236 transitions. Word has length 24 [2021-02-19 19:50:57,874 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 19:50:57,874 INFO L480 AbstractCegarLoop]: Abstraction has 860 states and 3236 transitions. [2021-02-19 19:50:57,874 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 4.8) internal successors, (24), 4 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:50:57,874 INFO L276 IsEmpty]: Start isEmpty. Operand 860 states and 3236 transitions. [2021-02-19 19:50:57,877 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-02-19 19:50:57,877 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 19:50:57,877 INFO L506 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 19:50:57,877 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-02-19 19:50:57,877 INFO L428 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr3INUSE_VIOLATION, ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 19:50:57,877 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 19:50:57,878 INFO L82 PathProgramCache]: Analyzing trace with hash 1395766844, now seen corresponding path program 3 times [2021-02-19 19:50:57,878 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 19:50:57,878 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1836821196] [2021-02-19 19:50:57,878 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 19:50:57,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:50:57,923 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:50:57,923 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1836821196] [2021-02-19 19:50:57,923 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [191979625] [2021-02-19 19:50:57,923 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 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 19:50:57,971 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-02-19 19:50:57,971 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 19:50:57,972 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 4 conjunts are in the unsatisfiable core [2021-02-19 19:50:57,973 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 19:50:58,057 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:50:58,057 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 19:50:58,057 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 4] total 8 [2021-02-19 19:50:58,058 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1093145132] [2021-02-19 19:50:58,058 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-02-19 19:50:58,058 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 19:50:58,058 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-02-19 19:50:58,059 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2021-02-19 19:50:58,059 INFO L87 Difference]: Start difference. First operand 860 states and 3236 transitions. Second operand has 9 states, 9 states have (on average 3.7777777777777777) internal successors, (34), 8 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:50:58,122 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 19:50:58,122 INFO L93 Difference]: Finished difference Result 882 states and 3347 transitions. [2021-02-19 19:50:58,124 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-02-19 19:50:58,127 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.7777777777777777) internal successors, (34), 8 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-02-19 19:50:58,127 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 19:50:58,132 INFO L225 Difference]: With dead ends: 882 [2021-02-19 19:50:58,132 INFO L226 Difference]: Without dead ends: 822 [2021-02-19 19:50:58,132 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 21 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=34, Invalid=56, Unknown=0, NotChecked=0, Total=90 [2021-02-19 19:50:58,135 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 822 states. [2021-02-19 19:50:58,154 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 822 to 702. [2021-02-19 19:50:58,156 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 702 states, 701 states have (on average 3.843081312410842) internal successors, (2694), 701 states have internal predecessors, (2694), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:50:58,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 702 states to 702 states and 2694 transitions. [2021-02-19 19:50:58,164 INFO L78 Accepts]: Start accepts. Automaton has 702 states and 2694 transitions. Word has length 24 [2021-02-19 19:50:58,166 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 19:50:58,166 INFO L480 AbstractCegarLoop]: Abstraction has 702 states and 2694 transitions. [2021-02-19 19:50:58,166 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 3.7777777777777777) internal successors, (34), 8 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:50:58,166 INFO L276 IsEmpty]: Start isEmpty. Operand 702 states and 2694 transitions. [2021-02-19 19:50:58,169 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-02-19 19:50:58,169 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 19:50:58,169 INFO L506 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 19:50:58,384 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 19:50:58,384 INFO L428 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr3INUSE_VIOLATION, ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 19:50:58,384 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 19:50:58,384 INFO L82 PathProgramCache]: Analyzing trace with hash -1098983200, now seen corresponding path program 1 times [2021-02-19 19:50:58,385 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 19:50:58,385 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [518734463] [2021-02-19 19:50:58,385 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 19:50:58,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:50:58,451 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:50:58,451 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [518734463] [2021-02-19 19:50:58,451 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1513351750] [2021-02-19 19:50:58,451 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 19:50:58,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:50:58,502 INFO L263 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 4 conjunts are in the unsatisfiable core [2021-02-19 19:50:58,503 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 19:50:58,570 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 19:50:58,571 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 19:50:58,571 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 4] total 9 [2021-02-19 19:50:58,571 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1122285262] [2021-02-19 19:50:58,571 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-02-19 19:50:58,572 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 19:50:58,572 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-02-19 19:50:58,572 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=58, Unknown=0, NotChecked=0, Total=90 [2021-02-19 19:50:58,572 INFO L87 Difference]: Start difference. First operand 702 states and 2694 transitions. Second operand has 10 states, 10 states have (on average 3.9) internal successors, (39), 9 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:50:58,648 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 19:50:58,648 INFO L93 Difference]: Finished difference Result 926 states and 3582 transitions. [2021-02-19 19:50:58,648 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-02-19 19:50:58,649 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.9) internal successors, (39), 9 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2021-02-19 19:50:58,649 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 19:50:58,654 INFO L225 Difference]: With dead ends: 926 [2021-02-19 19:50:58,654 INFO L226 Difference]: Without dead ends: 926 [2021-02-19 19:50:58,655 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2021-02-19 19:50:58,657 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 926 states. [2021-02-19 19:50:58,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 926 to 802. [2021-02-19 19:50:58,675 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 802 states, 801 states have (on average 3.857677902621723) internal successors, (3090), 801 states have internal predecessors, (3090), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:50:58,679 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 802 states to 802 states and 3090 transitions. [2021-02-19 19:50:58,679 INFO L78 Accepts]: Start accepts. Automaton has 802 states and 3090 transitions. Word has length 26 [2021-02-19 19:50:58,679 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 19:50:58,679 INFO L480 AbstractCegarLoop]: Abstraction has 802 states and 3090 transitions. [2021-02-19 19:50:58,679 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.9) internal successors, (39), 9 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:50:58,679 INFO L276 IsEmpty]: Start isEmpty. Operand 802 states and 3090 transitions. [2021-02-19 19:50:58,682 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-02-19 19:50:58,682 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 19:50:58,683 INFO L506 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 19:50:58,904 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 19:50:58,904 INFO L428 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr3INUSE_VIOLATION, ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 19:50:58,905 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 19:50:58,905 INFO L82 PathProgramCache]: Analyzing trace with hash -1967124382, now seen corresponding path program 1 times [2021-02-19 19:50:58,905 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 19:50:58,905 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2118503678] [2021-02-19 19:50:58,905 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 19:50:58,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:50:58,975 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-02-19 19:50:58,975 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2118503678] [2021-02-19 19:50:58,976 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2068702951] [2021-02-19 19:50:58,976 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 19:50:59,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:50:59,023 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 4 conjunts are in the unsatisfiable core [2021-02-19 19:50:59,025 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 19:50:59,099 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-02-19 19:50:59,099 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 19:50:59,099 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 4] total 9 [2021-02-19 19:50:59,100 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1555700614] [2021-02-19 19:50:59,100 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-02-19 19:50:59,100 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 19:50:59,100 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-02-19 19:50:59,100 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=58, Unknown=0, NotChecked=0, Total=90 [2021-02-19 19:50:59,101 INFO L87 Difference]: Start difference. First operand 802 states and 3090 transitions. Second operand has 10 states, 10 states have (on average 4.6) internal successors, (46), 9 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:50:59,164 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 19:50:59,165 INFO L93 Difference]: Finished difference Result 1509 states and 5726 transitions. [2021-02-19 19:50:59,165 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-02-19 19:50:59,166 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 4.6) internal successors, (46), 9 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2021-02-19 19:50:59,166 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 19:50:59,174 INFO L225 Difference]: With dead ends: 1509 [2021-02-19 19:50:59,175 INFO L226 Difference]: Without dead ends: 1509 [2021-02-19 19:50:59,175 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2021-02-19 19:50:59,178 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1509 states. [2021-02-19 19:50:59,200 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1509 to 953. [2021-02-19 19:50:59,202 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 953 states, 952 states have (on average 3.889705882352941) internal successors, (3703), 952 states have internal predecessors, (3703), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:50:59,207 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 953 states to 953 states and 3703 transitions. [2021-02-19 19:50:59,207 INFO L78 Accepts]: Start accepts. Automaton has 953 states and 3703 transitions. Word has length 28 [2021-02-19 19:50:59,207 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 19:50:59,207 INFO L480 AbstractCegarLoop]: Abstraction has 953 states and 3703 transitions. [2021-02-19 19:50:59,207 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 4.6) internal successors, (46), 9 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:50:59,207 INFO L276 IsEmpty]: Start isEmpty. Operand 953 states and 3703 transitions. [2021-02-19 19:50:59,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-02-19 19:50:59,210 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 19:50:59,210 INFO L506 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 19:50:59,434 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 19:50:59,435 INFO L428 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr3INUSE_VIOLATION, ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 19:50:59,435 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 19:50:59,435 INFO L82 PathProgramCache]: Analyzing trace with hash -235277442, now seen corresponding path program 2 times [2021-02-19 19:50:59,435 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 19:50:59,435 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [117825073] [2021-02-19 19:50:59,435 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 19:50:59,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:50:59,519 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-02-19 19:50:59,520 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [117825073] [2021-02-19 19:50:59,520 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [136863336] [2021-02-19 19:50:59,520 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 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 [2021-02-19 19:50:59,552 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-02-19 19:50:59,553 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 19:50:59,553 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 4 conjunts are in the unsatisfiable core [2021-02-19 19:50:59,555 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 19:50:59,630 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-02-19 19:50:59,631 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-02-19 19:50:59,631 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6] total 9 [2021-02-19 19:50:59,631 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1913519905] [2021-02-19 19:50:59,631 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-02-19 19:50:59,631 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 19:50:59,632 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-02-19 19:50:59,632 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2021-02-19 19:50:59,632 INFO L87 Difference]: Start difference. First operand 953 states and 3703 transitions. Second operand has 5 states, 5 states have (on average 5.6) internal successors, (28), 4 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:50:59,672 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 19:50:59,672 INFO L93 Difference]: Finished difference Result 1136 states and 4368 transitions. [2021-02-19 19:50:59,673 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-02-19 19:50:59,673 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 5.6) internal successors, (28), 4 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2021-02-19 19:50:59,673 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 19:50:59,679 INFO L225 Difference]: With dead ends: 1136 [2021-02-19 19:50:59,679 INFO L226 Difference]: Without dead ends: 1088 [2021-02-19 19:50:59,679 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2021-02-19 19:50:59,682 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1088 states. [2021-02-19 19:50:59,700 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1088 to 937. [2021-02-19 19:50:59,702 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 937 states, 936 states have (on average 3.8792735042735043) internal successors, (3631), 936 states have internal predecessors, (3631), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:50:59,714 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 937 states to 937 states and 3631 transitions. [2021-02-19 19:50:59,714 INFO L78 Accepts]: Start accepts. Automaton has 937 states and 3631 transitions. Word has length 28 [2021-02-19 19:50:59,714 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 19:50:59,714 INFO L480 AbstractCegarLoop]: Abstraction has 937 states and 3631 transitions. [2021-02-19 19:50:59,714 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 5.6) internal successors, (28), 4 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:50:59,714 INFO L276 IsEmpty]: Start isEmpty. Operand 937 states and 3631 transitions. [2021-02-19 19:50:59,717 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-02-19 19:50:59,717 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 19:50:59,717 INFO L506 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 19:50:59,938 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 19:50:59,939 INFO L428 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr3INUSE_VIOLATION, ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 19:50:59,939 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 19:50:59,939 INFO L82 PathProgramCache]: Analyzing trace with hash -1874575132, now seen corresponding path program 1 times [2021-02-19 19:50:59,939 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 19:50:59,939 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1564301829] [2021-02-19 19:50:59,939 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 19:50:59,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:51:00,005 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-02-19 19:51:00,005 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1564301829] [2021-02-19 19:51:00,005 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1192688381] [2021-02-19 19:51:00,005 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 19:51:00,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:51:00,050 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 11 conjunts are in the unsatisfiable core [2021-02-19 19:51:00,051 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 19:51:00,142 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-02-19 19:51:00,142 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 19:51:00,143 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2021-02-19 19:51:00,143 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1723874053] [2021-02-19 19:51:00,143 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-02-19 19:51:00,143 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 19:51:00,144 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-02-19 19:51:00,144 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-02-19 19:51:00,144 INFO L87 Difference]: Start difference. First operand 937 states and 3631 transitions. Second operand has 7 states, 7 states have (on average 5.285714285714286) internal successors, (37), 7 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:51:00,312 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 19:51:00,313 INFO L93 Difference]: Finished difference Result 4025 states and 15417 transitions. [2021-02-19 19:51:00,313 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-02-19 19:51:00,313 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 5.285714285714286) internal successors, (37), 7 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 30 [2021-02-19 19:51:00,313 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 19:51:00,337 INFO L225 Difference]: With dead ends: 4025 [2021-02-19 19:51:00,337 INFO L226 Difference]: Without dead ends: 3705 [2021-02-19 19:51:00,338 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 28 SyntacticMatches, 3 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2021-02-19 19:51:00,345 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3705 states. [2021-02-19 19:51:00,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3705 to 2630. [2021-02-19 19:51:00,421 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2630 states, 2629 states have (on average 3.9790794979079496) internal successors, (10461), 2629 states have internal predecessors, (10461), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:51:00,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2630 states to 2630 states and 10461 transitions. [2021-02-19 19:51:00,433 INFO L78 Accepts]: Start accepts. Automaton has 2630 states and 10461 transitions. Word has length 30 [2021-02-19 19:51:00,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 19:51:00,433 INFO L480 AbstractCegarLoop]: Abstraction has 2630 states and 10461 transitions. [2021-02-19 19:51:00,434 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 5.285714285714286) internal successors, (37), 7 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:51:00,434 INFO L276 IsEmpty]: Start isEmpty. Operand 2630 states and 10461 transitions. [2021-02-19 19:51:00,441 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-02-19 19:51:00,442 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 19:51:00,442 INFO L506 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 19:51:00,663 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 19:51:00,663 INFO L428 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr3INUSE_VIOLATION, ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 19:51:00,664 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 19:51:00,664 INFO L82 PathProgramCache]: Analyzing trace with hash -999591646, now seen corresponding path program 2 times [2021-02-19 19:51:00,664 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 19:51:00,665 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [868325739] [2021-02-19 19:51:00,665 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 19:51:00,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:51:00,736 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-02-19 19:51:00,737 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [868325739] [2021-02-19 19:51:00,737 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2083576764] [2021-02-19 19:51:00,737 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 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 19:51:00,772 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-02-19 19:51:00,772 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 19:51:00,772 INFO L263 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 6 conjunts are in the unsatisfiable core [2021-02-19 19:51:00,774 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 19:51:00,877 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-02-19 19:51:00,878 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 19:51:00,878 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 12 [2021-02-19 19:51:00,878 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [751770094] [2021-02-19 19:51:00,878 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-02-19 19:51:00,879 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 19:51:00,879 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-02-19 19:51:00,879 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=114, Unknown=0, NotChecked=0, Total=156 [2021-02-19 19:51:00,879 INFO L87 Difference]: Start difference. First operand 2630 states and 10461 transitions. Second operand has 13 states, 13 states have (on average 3.769230769230769) internal successors, (49), 12 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:51:01,178 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 19:51:01,179 INFO L93 Difference]: Finished difference Result 11823 states and 45853 transitions. [2021-02-19 19:51:01,179 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-02-19 19:51:01,179 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 3.769230769230769) internal successors, (49), 12 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 32 [2021-02-19 19:51:01,179 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 19:51:01,241 INFO L225 Difference]: With dead ends: 11823 [2021-02-19 19:51:01,241 INFO L226 Difference]: Without dead ends: 11823 [2021-02-19 19:51:01,241 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=134, Invalid=328, Unknown=0, NotChecked=0, Total=462 [2021-02-19 19:51:01,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11823 states. [2021-02-19 19:51:01,514 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11823 to 4060. [2021-02-19 19:51:01,536 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4060 states, 4059 states have (on average 4.138950480413895) internal successors, (16800), 4059 states have internal predecessors, (16800), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:51:01,555 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4060 states to 4060 states and 16800 transitions. [2021-02-19 19:51:01,555 INFO L78 Accepts]: Start accepts. Automaton has 4060 states and 16800 transitions. Word has length 32 [2021-02-19 19:51:01,556 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 19:51:01,556 INFO L480 AbstractCegarLoop]: Abstraction has 4060 states and 16800 transitions. [2021-02-19 19:51:01,557 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 3.769230769230769) internal successors, (49), 12 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:51:01,557 INFO L276 IsEmpty]: Start isEmpty. Operand 4060 states and 16800 transitions. [2021-02-19 19:51:01,569 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-02-19 19:51:01,570 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 19:51:01,570 INFO L506 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 19:51:01,791 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 19:51:01,791 INFO L428 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr3INUSE_VIOLATION, ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 19:51:01,792 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 19:51:01,792 INFO L82 PathProgramCache]: Analyzing trace with hash 1647961958, now seen corresponding path program 3 times [2021-02-19 19:51:01,792 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 19:51:01,792 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1316526477] [2021-02-19 19:51:01,792 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 19:51:01,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:51:01,905 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-02-19 19:51:01,905 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1316526477] [2021-02-19 19:51:01,905 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1959239969] [2021-02-19 19:51:01,905 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 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 19:51:01,955 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-02-19 19:51:01,955 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 19:51:01,956 INFO L263 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 8 conjunts are in the unsatisfiable core [2021-02-19 19:51:01,957 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 19:51:02,073 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-02-19 19:51:02,073 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 19:51:02,073 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 11 [2021-02-19 19:51:02,074 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1134885033] [2021-02-19 19:51:02,074 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-02-19 19:51:02,074 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 19:51:02,075 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-02-19 19:51:02,075 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2021-02-19 19:51:02,075 INFO L87 Difference]: Start difference. First operand 4060 states and 16800 transitions. Second operand has 12 states, 12 states have (on average 4.333333333333333) internal successors, (52), 11 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:51:02,769 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 19:51:02,769 INFO L93 Difference]: Finished difference Result 18640 states and 72700 transitions. [2021-02-19 19:51:02,770 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-02-19 19:51:02,770 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 4.333333333333333) internal successors, (52), 11 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 32 [2021-02-19 19:51:02,770 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 19:51:02,836 INFO L225 Difference]: With dead ends: 18640 [2021-02-19 19:51:02,836 INFO L226 Difference]: Without dead ends: 17252 [2021-02-19 19:51:02,837 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 297 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=285, Invalid=905, Unknown=0, NotChecked=0, Total=1190 [2021-02-19 19:51:02,888 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17252 states. [2021-02-19 19:51:03,311 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17252 to 8566. [2021-02-19 19:51:03,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8566 states, 8565 states have (on average 4.2192644483362525) internal successors, (36138), 8565 states have internal predecessors, (36138), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:51:03,364 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8566 states to 8566 states and 36138 transitions. [2021-02-19 19:51:03,365 INFO L78 Accepts]: Start accepts. Automaton has 8566 states and 36138 transitions. Word has length 32 [2021-02-19 19:51:03,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 19:51:03,365 INFO L480 AbstractCegarLoop]: Abstraction has 8566 states and 36138 transitions. [2021-02-19 19:51:03,365 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 4.333333333333333) internal successors, (52), 11 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:51:03,365 INFO L276 IsEmpty]: Start isEmpty. Operand 8566 states and 36138 transitions. [2021-02-19 19:51:03,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-02-19 19:51:03,389 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 19:51:03,389 INFO L506 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 19:51:03,606 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-02-19 19:51:03,606 INFO L428 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr3INUSE_VIOLATION, ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 19:51:03,607 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 19:51:03,607 INFO L82 PathProgramCache]: Analyzing trace with hash -527626998, now seen corresponding path program 4 times [2021-02-19 19:51:03,607 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 19:51:03,607 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [945046434] [2021-02-19 19:51:03,607 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 19:51:03,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:51:03,680 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-02-19 19:51:03,680 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [945046434] [2021-02-19 19:51:03,680 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1063196254] [2021-02-19 19:51:03,681 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 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 19:51:03,716 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-02-19 19:51:03,716 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 19:51:03,716 INFO L263 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 6 conjunts are in the unsatisfiable core [2021-02-19 19:51:03,717 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 19:51:03,899 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-02-19 19:51:03,900 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 19:51:03,900 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 10 [2021-02-19 19:51:03,900 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [596809921] [2021-02-19 19:51:03,900 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-02-19 19:51:03,900 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 19:51:03,901 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-02-19 19:51:03,901 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2021-02-19 19:51:03,901 INFO L87 Difference]: Start difference. First operand 8566 states and 36138 transitions. Second operand has 11 states, 11 states have (on average 4.2727272727272725) internal successors, (47), 10 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:51:04,153 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 19:51:04,153 INFO L93 Difference]: Finished difference Result 13296 states and 52964 transitions. [2021-02-19 19:51:04,153 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-02-19 19:51:04,153 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 4.2727272727272725) internal successors, (47), 10 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 32 [2021-02-19 19:51:04,153 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 19:51:04,202 INFO L225 Difference]: With dead ends: 13296 [2021-02-19 19:51:04,202 INFO L226 Difference]: Without dead ends: 13128 [2021-02-19 19:51:04,203 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=51, Invalid=105, Unknown=0, NotChecked=0, Total=156 [2021-02-19 19:51:04,229 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13128 states. [2021-02-19 19:51:04,526 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13128 to 8482. [2021-02-19 19:51:04,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8482 states, 8481 states have (on average 4.17851668435326) internal successors, (35438), 8481 states have internal predecessors, (35438), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:51:04,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8482 states to 8482 states and 35438 transitions. [2021-02-19 19:51:04,581 INFO L78 Accepts]: Start accepts. Automaton has 8482 states and 35438 transitions. Word has length 32 [2021-02-19 19:51:04,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 19:51:04,581 INFO L480 AbstractCegarLoop]: Abstraction has 8482 states and 35438 transitions. [2021-02-19 19:51:04,581 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 4.2727272727272725) internal successors, (47), 10 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:51:04,581 INFO L276 IsEmpty]: Start isEmpty. Operand 8482 states and 35438 transitions. [2021-02-19 19:51:04,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-02-19 19:51:04,602 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 19:51:04,602 INFO L506 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 19:51:04,824 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 19:51:04,825 INFO L428 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr3INUSE_VIOLATION, ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 19:51:04,825 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 19:51:04,825 INFO L82 PathProgramCache]: Analyzing trace with hash -2054797130, now seen corresponding path program 5 times [2021-02-19 19:51:04,825 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 19:51:04,825 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [824842455] [2021-02-19 19:51:04,825 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 19:51:04,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:51:04,899 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-02-19 19:51:04,900 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [824842455] [2021-02-19 19:51:04,900 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1035671025] [2021-02-19 19:51:04,900 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 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 19:51:04,946 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-02-19 19:51:04,947 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 19:51:04,947 INFO L263 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 6 conjunts are in the unsatisfiable core [2021-02-19 19:51:04,950 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 19:51:05,053 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-02-19 19:51:05,053 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 19:51:05,053 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 5] total 11 [2021-02-19 19:51:05,054 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [512808650] [2021-02-19 19:51:05,054 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-02-19 19:51:05,054 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 19:51:05,054 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-02-19 19:51:05,054 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=94, Unknown=0, NotChecked=0, Total=132 [2021-02-19 19:51:05,055 INFO L87 Difference]: Start difference. First operand 8482 states and 35438 transitions. Second operand has 12 states, 12 states have (on average 4.166666666666667) internal successors, (50), 11 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:51:05,260 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 19:51:05,260 INFO L93 Difference]: Finished difference Result 17125 states and 69725 transitions. [2021-02-19 19:51:05,261 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-02-19 19:51:05,261 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 4.166666666666667) internal successors, (50), 11 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 32 [2021-02-19 19:51:05,261 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 19:51:05,311 INFO L225 Difference]: With dead ends: 17125 [2021-02-19 19:51:05,311 INFO L226 Difference]: Without dead ends: 17125 [2021-02-19 19:51:05,311 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=70, Invalid=140, Unknown=0, NotChecked=0, Total=210 [2021-02-19 19:51:05,337 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17125 states. [2021-02-19 19:51:05,625 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17125 to 10475. [2021-02-19 19:51:05,647 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10475 states, 10474 states have (on average 4.289765132709567) internal successors, (44931), 10474 states have internal predecessors, (44931), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:51:05,687 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10475 states to 10475 states and 44931 transitions. [2021-02-19 19:51:05,687 INFO L78 Accepts]: Start accepts. Automaton has 10475 states and 44931 transitions. Word has length 32 [2021-02-19 19:51:05,687 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 19:51:05,687 INFO L480 AbstractCegarLoop]: Abstraction has 10475 states and 44931 transitions. [2021-02-19 19:51:05,688 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 4.166666666666667) internal successors, (50), 11 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:51:05,688 INFO L276 IsEmpty]: Start isEmpty. Operand 10475 states and 44931 transitions. [2021-02-19 19:51:05,713 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-02-19 19:51:05,713 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 19:51:05,714 INFO L506 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 19:51:05,930 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 19:51:05,931 INFO L428 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr3INUSE_VIOLATION, ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 19:51:05,931 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 19:51:05,931 INFO L82 PathProgramCache]: Analyzing trace with hash 1825710334, now seen corresponding path program 6 times [2021-02-19 19:51:05,931 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 19:51:05,931 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [881128260] [2021-02-19 19:51:05,931 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 19:51:05,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:51:05,976 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-02-19 19:51:05,976 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [881128260] [2021-02-19 19:51:05,976 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [693090083] [2021-02-19 19:51:05,976 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 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 19:51:06,016 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-02-19 19:51:06,016 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 19:51:06,016 INFO L263 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 6 conjunts are in the unsatisfiable core [2021-02-19 19:51:06,017 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 19:51:06,093 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-02-19 19:51:06,093 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 19:51:06,093 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 10 [2021-02-19 19:51:06,094 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1757416567] [2021-02-19 19:51:06,094 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-02-19 19:51:06,094 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 19:51:06,094 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-02-19 19:51:06,094 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2021-02-19 19:51:06,095 INFO L87 Difference]: Start difference. First operand 10475 states and 44931 transitions. Second operand has 11 states, 11 states have (on average 4.2727272727272725) internal successors, (47), 10 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:51:06,345 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 19:51:06,345 INFO L93 Difference]: Finished difference Result 16571 states and 66710 transitions. [2021-02-19 19:51:06,346 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-02-19 19:51:06,347 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 4.2727272727272725) internal successors, (47), 10 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 32 [2021-02-19 19:51:06,347 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 19:51:06,384 INFO L225 Difference]: With dead ends: 16571 [2021-02-19 19:51:06,384 INFO L226 Difference]: Without dead ends: 16190 [2021-02-19 19:51:06,384 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=50, Invalid=106, Unknown=0, NotChecked=0, Total=156 [2021-02-19 19:51:06,404 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16190 states. [2021-02-19 19:51:06,676 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16190 to 10209. [2021-02-19 19:51:06,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10209 states, 10208 states have (on average 4.278800940438871) internal successors, (43678), 10208 states have internal predecessors, (43678), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:51:06,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10209 states to 10209 states and 43678 transitions. [2021-02-19 19:51:06,733 INFO L78 Accepts]: Start accepts. Automaton has 10209 states and 43678 transitions. Word has length 32 [2021-02-19 19:51:06,733 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 19:51:06,733 INFO L480 AbstractCegarLoop]: Abstraction has 10209 states and 43678 transitions. [2021-02-19 19:51:06,733 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 4.2727272727272725) internal successors, (47), 10 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:51:06,733 INFO L276 IsEmpty]: Start isEmpty. Operand 10209 states and 43678 transitions. [2021-02-19 19:51:06,759 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-02-19 19:51:06,760 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 19:51:06,760 INFO L506 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 19:51:06,981 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-02-19 19:51:06,981 INFO L428 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr3INUSE_VIOLATION, ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 19:51:06,981 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 19:51:06,981 INFO L82 PathProgramCache]: Analyzing trace with hash -847937474, now seen corresponding path program 7 times [2021-02-19 19:51:06,982 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 19:51:06,982 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [65655037] [2021-02-19 19:51:06,982 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 19:51:06,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:51:07,032 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-02-19 19:51:07,032 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [65655037] [2021-02-19 19:51:07,032 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [451607302] [2021-02-19 19:51:07,032 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 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 [2021-02-19 19:51:07,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:51:07,057 INFO L263 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 6 conjunts are in the unsatisfiable core [2021-02-19 19:51:07,058 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 19:51:07,149 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-02-19 19:51:07,150 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 19:51:07,150 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 11 [2021-02-19 19:51:07,150 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1165619139] [2021-02-19 19:51:07,150 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-02-19 19:51:07,151 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 19:51:07,152 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-02-19 19:51:07,152 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2021-02-19 19:51:07,152 INFO L87 Difference]: Start difference. First operand 10209 states and 43678 transitions. Second operand has 12 states, 12 states have (on average 3.9166666666666665) internal successors, (47), 11 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:51:07,444 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 19:51:07,445 INFO L93 Difference]: Finished difference Result 19431 states and 81047 transitions. [2021-02-19 19:51:07,445 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-02-19 19:51:07,445 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.9166666666666665) internal successors, (47), 11 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 32 [2021-02-19 19:51:07,446 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 19:51:07,489 INFO L225 Difference]: With dead ends: 19431 [2021-02-19 19:51:07,489 INFO L226 Difference]: Without dead ends: 19035 [2021-02-19 19:51:07,489 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=70, Invalid=170, Unknown=0, NotChecked=0, Total=240 [2021-02-19 19:51:07,518 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19035 states. [2021-02-19 19:51:07,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19035 to 13737. [2021-02-19 19:51:07,929 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13737 states, 13736 states have (on average 4.360439720442632) internal successors, (59895), 13736 states have internal predecessors, (59895), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:51:07,980 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13737 states to 13737 states and 59895 transitions. [2021-02-19 19:51:07,981 INFO L78 Accepts]: Start accepts. Automaton has 13737 states and 59895 transitions. Word has length 32 [2021-02-19 19:51:07,982 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 19:51:07,982 INFO L480 AbstractCegarLoop]: Abstraction has 13737 states and 59895 transitions. [2021-02-19 19:51:07,982 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 3.9166666666666665) internal successors, (47), 11 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:51:07,982 INFO L276 IsEmpty]: Start isEmpty. Operand 13737 states and 59895 transitions. [2021-02-19 19:51:08,019 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-02-19 19:51:08,019 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 19:51:08,019 INFO L506 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 19:51:08,241 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-02-19 19:51:08,241 INFO L428 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr3INUSE_VIOLATION, ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 19:51:08,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 19:51:08,242 INFO L82 PathProgramCache]: Analyzing trace with hash -1824524482, now seen corresponding path program 8 times [2021-02-19 19:51:08,242 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 19:51:08,242 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1686326151] [2021-02-19 19:51:08,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 19:51:08,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:51:08,292 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-02-19 19:51:08,292 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1686326151] [2021-02-19 19:51:08,293 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1850363817] [2021-02-19 19:51:08,293 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 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 19:51:08,319 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-02-19 19:51:08,320 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 19:51:08,320 INFO L263 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 6 conjunts are in the unsatisfiable core [2021-02-19 19:51:08,321 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 19:51:08,412 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-02-19 19:51:08,413 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 19:51:08,413 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 11 [2021-02-19 19:51:08,413 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [868222421] [2021-02-19 19:51:08,413 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-02-19 19:51:08,413 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 19:51:08,414 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-02-19 19:51:08,414 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-02-19 19:51:08,414 INFO L87 Difference]: Start difference. First operand 13737 states and 59895 transitions. Second operand has 12 states, 12 states have (on average 4.333333333333333) internal successors, (52), 11 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:51:08,827 WARN L202 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 14 [2021-02-19 19:51:09,733 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 19:51:09,733 INFO L93 Difference]: Finished difference Result 59639 states and 243328 transitions. [2021-02-19 19:51:09,733 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-02-19 19:51:09,733 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 4.333333333333333) internal successors, (52), 11 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 32 [2021-02-19 19:51:09,734 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 19:51:09,922 INFO L225 Difference]: With dead ends: 59639 [2021-02-19 19:51:09,922 INFO L226 Difference]: Without dead ends: 58849 [2021-02-19 19:51:09,923 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 495 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=406, Invalid=1234, Unknown=0, NotChecked=0, Total=1640 [2021-02-19 19:51:10,023 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58849 states. [2021-02-19 19:51:10,931 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58849 to 27180. [2021-02-19 19:51:10,979 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27180 states, 27179 states have (on average 4.433606828801648) internal successors, (120501), 27179 states have internal predecessors, (120501), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:51:11,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27180 states to 27180 states and 120501 transitions. [2021-02-19 19:51:11,091 INFO L78 Accepts]: Start accepts. Automaton has 27180 states and 120501 transitions. Word has length 32 [2021-02-19 19:51:11,091 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 19:51:11,092 INFO L480 AbstractCegarLoop]: Abstraction has 27180 states and 120501 transitions. [2021-02-19 19:51:11,092 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 4.333333333333333) internal successors, (52), 11 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:51:11,092 INFO L276 IsEmpty]: Start isEmpty. Operand 27180 states and 120501 transitions. [2021-02-19 19:51:11,155 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-02-19 19:51:11,155 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 19:51:11,156 INFO L506 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 19:51:11,356 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-02-19 19:51:11,356 INFO L428 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr3INUSE_VIOLATION, ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 19:51:11,357 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 19:51:11,357 INFO L82 PathProgramCache]: Analyzing trace with hash -1599066302, now seen corresponding path program 9 times [2021-02-19 19:51:11,357 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 19:51:11,357 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1171597221] [2021-02-19 19:51:11,357 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 19:51:11,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:51:11,448 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-02-19 19:51:11,449 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1171597221] [2021-02-19 19:51:11,449 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1725178033] [2021-02-19 19:51:11,449 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 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 19:51:11,484 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-02-19 19:51:11,484 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 19:51:11,485 INFO L263 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 8 conjunts are in the unsatisfiable core [2021-02-19 19:51:11,486 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 19:51:11,577 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-02-19 19:51:11,578 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 19:51:11,578 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 5] total 10 [2021-02-19 19:51:11,578 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1460745730] [2021-02-19 19:51:11,578 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-02-19 19:51:11,578 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 19:51:11,581 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-02-19 19:51:11,581 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=72, Unknown=0, NotChecked=0, Total=110 [2021-02-19 19:51:11,581 INFO L87 Difference]: Start difference. First operand 27180 states and 120501 transitions. Second operand has 11 states, 11 states have (on average 4.363636363636363) internal successors, (48), 10 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:51:11,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 19:51:11,885 INFO L93 Difference]: Finished difference Result 31277 states and 134903 transitions. [2021-02-19 19:51:11,885 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-02-19 19:51:11,885 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 4.363636363636363) internal successors, (48), 10 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 32 [2021-02-19 19:51:11,885 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 19:51:11,972 INFO L225 Difference]: With dead ends: 31277 [2021-02-19 19:51:11,972 INFO L226 Difference]: Without dead ends: 30802 [2021-02-19 19:51:11,972 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=64, Invalid=118, Unknown=0, NotChecked=0, Total=182 [2021-02-19 19:51:12,011 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30802 states. [2021-02-19 19:51:12,572 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30802 to 25038. [2021-02-19 19:51:12,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25038 states, 25037 states have (on average 4.435155969165635) internal successors, (111043), 25037 states have internal predecessors, (111043), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:51:12,686 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25038 states to 25038 states and 111043 transitions. [2021-02-19 19:51:12,686 INFO L78 Accepts]: Start accepts. Automaton has 25038 states and 111043 transitions. Word has length 32 [2021-02-19 19:51:12,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 19:51:12,686 INFO L480 AbstractCegarLoop]: Abstraction has 25038 states and 111043 transitions. [2021-02-19 19:51:12,687 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 4.363636363636363) internal successors, (48), 10 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:51:12,687 INFO L276 IsEmpty]: Start isEmpty. Operand 25038 states and 111043 transitions. [2021-02-19 19:51:12,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-02-19 19:51:12,740 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 19:51:12,740 INFO L506 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 19:51:12,943 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 19:51:12,944 INFO L428 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr3INUSE_VIOLATION, ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 19:51:12,944 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 19:51:12,944 INFO L82 PathProgramCache]: Analyzing trace with hash -1367372228, now seen corresponding path program 10 times [2021-02-19 19:51:12,944 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 19:51:12,944 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1406127118] [2021-02-19 19:51:12,944 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 19:51:12,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:51:12,988 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-02-19 19:51:12,989 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1406127118] [2021-02-19 19:51:12,989 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [675158134] [2021-02-19 19:51:12,989 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 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 19:51:13,023 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-02-19 19:51:13,023 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 19:51:13,023 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 8 conjunts are in the unsatisfiable core [2021-02-19 19:51:13,024 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 19:51:13,108 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-02-19 19:51:13,108 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 19:51:13,108 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 10 [2021-02-19 19:51:13,108 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1803436990] [2021-02-19 19:51:13,108 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-02-19 19:51:13,108 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 19:51:13,109 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-02-19 19:51:13,109 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=86, Unknown=0, NotChecked=0, Total=110 [2021-02-19 19:51:13,109 INFO L87 Difference]: Start difference. First operand 25038 states and 111043 transitions. Second operand has 11 states, 11 states have (on average 4.7272727272727275) internal successors, (52), 10 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:51:14,055 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 19:51:14,055 INFO L93 Difference]: Finished difference Result 54817 states and 230789 transitions. [2021-02-19 19:51:14,056 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-02-19 19:51:14,056 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 4.7272727272727275) internal successors, (52), 10 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 34 [2021-02-19 19:51:14,056 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 19:51:14,209 INFO L225 Difference]: With dead ends: 54817 [2021-02-19 19:51:14,209 INFO L226 Difference]: Without dead ends: 53957 [2021-02-19 19:51:14,210 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 441 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=322, Invalid=1238, Unknown=0, NotChecked=0, Total=1560 [2021-02-19 19:51:14,477 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53957 states. [2021-02-19 19:51:15,186 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53957 to 33088. [2021-02-19 19:51:15,232 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33088 states, 33087 states have (on average 4.473599903285278) internal successors, (148018), 33087 states have internal predecessors, (148018), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:51:15,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33088 states to 33088 states and 148018 transitions. [2021-02-19 19:51:15,348 INFO L78 Accepts]: Start accepts. Automaton has 33088 states and 148018 transitions. Word has length 34 [2021-02-19 19:51:15,348 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 19:51:15,348 INFO L480 AbstractCegarLoop]: Abstraction has 33088 states and 148018 transitions. [2021-02-19 19:51:15,348 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 4.7272727272727275) internal successors, (52), 10 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:51:15,348 INFO L276 IsEmpty]: Start isEmpty. Operand 33088 states and 148018 transitions. [2021-02-19 19:51:15,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-02-19 19:51:15,431 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 19:51:15,431 INFO L506 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 19:51:15,632 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 19:51:15,632 INFO L428 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr3INUSE_VIOLATION, ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 19:51:15,632 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 19:51:15,632 INFO L82 PathProgramCache]: Analyzing trace with hash -1895133256, now seen corresponding path program 11 times [2021-02-19 19:51:15,632 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 19:51:15,633 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [791877689] [2021-02-19 19:51:15,633 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 19:51:15,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:51:15,692 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-02-19 19:51:15,693 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [791877689] [2021-02-19 19:51:15,693 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1970176361] [2021-02-19 19:51:15,693 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 19:51:15,720 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-02-19 19:51:15,720 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 19:51:15,721 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 6 conjunts are in the unsatisfiable core [2021-02-19 19:51:15,721 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 19:51:15,819 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-02-19 19:51:15,819 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 19:51:15,819 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 11 [2021-02-19 19:51:15,819 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [274576048] [2021-02-19 19:51:15,820 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-02-19 19:51:15,820 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 19:51:15,820 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-02-19 19:51:15,821 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2021-02-19 19:51:15,821 INFO L87 Difference]: Start difference. First operand 33088 states and 148018 transitions. Second operand has 12 states, 12 states have (on average 4.25) internal successors, (51), 11 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:51:17,026 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 19:51:17,026 INFO L93 Difference]: Finished difference Result 59653 states and 250894 transitions. [2021-02-19 19:51:17,027 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-02-19 19:51:17,027 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 4.25) internal successors, (51), 11 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 34 [2021-02-19 19:51:17,027 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 19:51:17,204 INFO L225 Difference]: With dead ends: 59653 [2021-02-19 19:51:17,204 INFO L226 Difference]: Without dead ends: 58480 [2021-02-19 19:51:17,205 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 387 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=369, Invalid=1191, Unknown=0, NotChecked=0, Total=1560 [2021-02-19 19:51:17,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58480 states. [2021-02-19 19:51:18,123 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58480 to 38451. [2021-02-19 19:51:18,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38451 states, 38450 states have (on average 4.454200260078023) internal successors, (171264), 38450 states have internal predecessors, (171264), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:51:18,291 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38451 states to 38451 states and 171264 transitions. [2021-02-19 19:51:18,291 INFO L78 Accepts]: Start accepts. Automaton has 38451 states and 171264 transitions. Word has length 34 [2021-02-19 19:51:18,291 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 19:51:18,291 INFO L480 AbstractCegarLoop]: Abstraction has 38451 states and 171264 transitions. [2021-02-19 19:51:18,292 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 4.25) internal successors, (51), 11 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:51:18,292 INFO L276 IsEmpty]: Start isEmpty. Operand 38451 states and 171264 transitions. [2021-02-19 19:51:18,361 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-02-19 19:51:18,362 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 19:51:18,362 INFO L506 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 19:51:18,566 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 19:51:18,566 INFO L428 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr3INUSE_VIOLATION, ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 19:51:18,566 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 19:51:18,566 INFO L82 PathProgramCache]: Analyzing trace with hash -111209118, now seen corresponding path program 12 times [2021-02-19 19:51:18,566 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 19:51:18,566 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2131116537] [2021-02-19 19:51:18,566 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 19:51:18,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:51:18,642 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-02-19 19:51:18,642 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2131116537] [2021-02-19 19:51:18,642 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1347045093] [2021-02-19 19:51:18,642 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 19:51:19,010 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-02-19 19:51:19,011 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 19:51:19,011 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 8 conjunts are in the unsatisfiable core [2021-02-19 19:51:19,014 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 19:51:19,123 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 1 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-02-19 19:51:19,124 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 19:51:19,124 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 6] total 11 [2021-02-19 19:51:19,124 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1624971695] [2021-02-19 19:51:19,125 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-02-19 19:51:19,125 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 19:51:19,126 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-02-19 19:51:19,126 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2021-02-19 19:51:19,126 INFO L87 Difference]: Start difference. First operand 38451 states and 171264 transitions. Second operand has 12 states, 12 states have (on average 4.416666666666667) internal successors, (53), 11 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:51:20,322 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 19:51:20,322 INFO L93 Difference]: Finished difference Result 101501 states and 447345 transitions. [2021-02-19 19:51:20,322 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-02-19 19:51:20,323 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 4.416666666666667) internal successors, (53), 11 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 36 [2021-02-19 19:51:20,323 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 19:51:20,753 INFO L225 Difference]: With dead ends: 101501 [2021-02-19 19:51:20,753 INFO L226 Difference]: Without dead ends: 100925 [2021-02-19 19:51:20,754 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 32 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 82 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=148, Invalid=404, Unknown=0, NotChecked=0, Total=552 [2021-02-19 19:51:20,892 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100925 states. [2021-02-19 19:51:22,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100925 to 64709. [2021-02-19 19:51:22,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64709 states, 64708 states have (on average 4.539284168881745) internal successors, (293728), 64708 states have internal predecessors, (293728), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:51:23,132 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64709 states to 64709 states and 293728 transitions. [2021-02-19 19:51:23,133 INFO L78 Accepts]: Start accepts. Automaton has 64709 states and 293728 transitions. Word has length 36 [2021-02-19 19:51:23,133 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 19:51:23,133 INFO L480 AbstractCegarLoop]: Abstraction has 64709 states and 293728 transitions. [2021-02-19 19:51:23,133 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 4.416666666666667) internal successors, (53), 11 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:51:23,133 INFO L276 IsEmpty]: Start isEmpty. Operand 64709 states and 293728 transitions. [2021-02-19 19:51:23,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-02-19 19:51:23,280 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 19:51:23,280 INFO L506 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 19:51:23,481 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2021-02-19 19:51:23,482 INFO L428 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr3INUSE_VIOLATION, ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 19:51:23,482 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 19:51:23,482 INFO L82 PathProgramCache]: Analyzing trace with hash 1649594426, now seen corresponding path program 13 times [2021-02-19 19:51:23,482 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 19:51:23,482 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [857112610] [2021-02-19 19:51:23,482 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 19:51:23,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:51:23,559 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 5 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-02-19 19:51:23,559 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [857112610] [2021-02-19 19:51:23,559 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [312473840] [2021-02-19 19:51:23,559 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 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 19:51:23,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:51:23,604 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 8 conjunts are in the unsatisfiable core [2021-02-19 19:51:23,604 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 19:51:23,706 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 10 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-02-19 19:51:23,706 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 19:51:23,706 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 11 [2021-02-19 19:51:23,706 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1822336821] [2021-02-19 19:51:23,706 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-02-19 19:51:23,706 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 19:51:23,708 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-02-19 19:51:23,708 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2021-02-19 19:51:23,708 INFO L87 Difference]: Start difference. First operand 64709 states and 293728 transitions. Second operand has 12 states, 12 states have (on average 4.916666666666667) internal successors, (59), 11 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:51:27,793 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 19:51:27,794 INFO L93 Difference]: Finished difference Result 345279 states and 1557613 transitions. [2021-02-19 19:51:27,810 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-02-19 19:51:27,810 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 4.916666666666667) internal successors, (59), 11 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 36 [2021-02-19 19:51:27,810 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 19:51:29,486 INFO L225 Difference]: With dead ends: 345279 [2021-02-19 19:51:29,486 INFO L226 Difference]: Without dead ends: 340111 [2021-02-19 19:51:29,487 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 410 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=365, Invalid=1117, Unknown=0, NotChecked=0, Total=1482 [2021-02-19 19:51:30,521 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 340111 states. [2021-02-19 19:51:37,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 340111 to 209327. [2021-02-19 19:51:37,427 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 209327 states, 209326 states have (on average 4.720412180044524) internal successors, (988105), 209326 states have internal predecessors, (988105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:51:39,407 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 209327 states to 209327 states and 988105 transitions. [2021-02-19 19:51:39,408 INFO L78 Accepts]: Start accepts. Automaton has 209327 states and 988105 transitions. Word has length 36 [2021-02-19 19:51:39,408 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 19:51:39,408 INFO L480 AbstractCegarLoop]: Abstraction has 209327 states and 988105 transitions. [2021-02-19 19:51:39,408 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 4.916666666666667) internal successors, (59), 11 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:51:39,408 INFO L276 IsEmpty]: Start isEmpty. Operand 209327 states and 988105 transitions. [2021-02-19 19:51:39,995 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-02-19 19:51:39,995 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 19:51:39,995 INFO L506 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 19:51:40,195 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-02-19 19:51:40,196 INFO L428 AbstractCegarLoop]: === Iteration 23 === [ULTIMATE.startErr3INUSE_VIOLATION, ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 19:51:40,196 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 19:51:40,196 INFO L82 PathProgramCache]: Analyzing trace with hash 1439619580, now seen corresponding path program 14 times [2021-02-19 19:51:40,196 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 19:51:40,196 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [754749522] [2021-02-19 19:51:40,196 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 19:51:40,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:51:40,253 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-02-19 19:51:40,253 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [754749522] [2021-02-19 19:51:40,254 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [392691008] [2021-02-19 19:51:40,254 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 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 19:51:40,279 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-02-19 19:51:40,279 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 19:51:40,279 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 8 conjunts are in the unsatisfiable core [2021-02-19 19:51:40,280 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 19:51:40,371 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-02-19 19:51:40,371 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 19:51:40,371 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 10 [2021-02-19 19:51:40,371 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1518787822] [2021-02-19 19:51:40,371 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-02-19 19:51:40,371 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 19:51:40,371 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-02-19 19:51:40,371 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2021-02-19 19:51:40,372 INFO L87 Difference]: Start difference. First operand 209327 states and 988105 transitions. Second operand has 11 states, 11 states have (on average 4.545454545454546) internal successors, (50), 10 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:51:43,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 19:51:43,510 INFO L93 Difference]: Finished difference Result 231776 states and 1069827 transitions. [2021-02-19 19:51:43,510 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-02-19 19:51:43,510 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 4.545454545454546) internal successors, (50), 10 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 36 [2021-02-19 19:51:43,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 19:51:44,598 INFO L225 Difference]: With dead ends: 231776 [2021-02-19 19:51:44,598 INFO L226 Difference]: Without dead ends: 229312 [2021-02-19 19:51:44,599 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=70, Invalid=140, Unknown=0, NotChecked=0, Total=210 [2021-02-19 19:51:44,909 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 229312 states. [2021-02-19 19:51:49,710 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 229312 to 204036. [2021-02-19 19:51:50,621 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 204036 states, 204035 states have (on average 4.715220427867767) internal successors, (962070), 204035 states have internal predecessors, (962070), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:51:51,705 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204036 states to 204036 states and 962070 transitions. [2021-02-19 19:51:51,705 INFO L78 Accepts]: Start accepts. Automaton has 204036 states and 962070 transitions. Word has length 36 [2021-02-19 19:51:51,706 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 19:51:51,706 INFO L480 AbstractCegarLoop]: Abstraction has 204036 states and 962070 transitions. [2021-02-19 19:51:51,706 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 4.545454545454546) internal successors, (50), 10 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:51:51,706 INFO L276 IsEmpty]: Start isEmpty. Operand 204036 states and 962070 transitions. [2021-02-19 19:51:53,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-02-19 19:51:53,117 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 19:51:53,117 INFO L506 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 19:51:53,322 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-02-19 19:51:53,322 INFO L428 AbstractCegarLoop]: === Iteration 24 === [ULTIMATE.startErr3INUSE_VIOLATION, ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 19:51:53,322 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 19:51:53,322 INFO L82 PathProgramCache]: Analyzing trace with hash -751434268, now seen corresponding path program 15 times [2021-02-19 19:51:53,322 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 19:51:53,322 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [506113894] [2021-02-19 19:51:53,322 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 19:51:53,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:51:53,437 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-02-19 19:51:53,437 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [506113894] [2021-02-19 19:51:53,438 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [801720791] [2021-02-19 19:51:53,438 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 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 19:51:53,469 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-02-19 19:51:53,470 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 19:51:53,470 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 19 conjunts are in the unsatisfiable core [2021-02-19 19:51:53,471 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 19:51:53,565 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-02-19 19:51:53,565 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 19:51:53,565 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2021-02-19 19:51:53,565 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [546887457] [2021-02-19 19:51:53,566 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-02-19 19:51:53,566 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 19:51:53,566 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-02-19 19:51:53,566 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-02-19 19:51:53,566 INFO L87 Difference]: Start difference. First operand 204036 states and 962070 transitions. Second operand has 9 states, 9 states have (on average 5.0) internal successors, (45), 9 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:51:59,257 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 19:51:59,258 INFO L93 Difference]: Finished difference Result 502202 states and 2377356 transitions. [2021-02-19 19:51:59,258 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-02-19 19:51:59,258 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 5.0) internal successors, (45), 9 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 38 [2021-02-19 19:51:59,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 19:52:02,791 INFO L225 Difference]: With dead ends: 502202 [2021-02-19 19:52:02,791 INFO L226 Difference]: Without dead ends: 498334 [2021-02-19 19:52:02,791 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 38 SyntacticMatches, 3 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2021-02-19 19:52:03,436 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 498334 states. [2021-02-19 19:52:13,820 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 498334 to 386864. [2021-02-19 19:52:14,506 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 386864 states, 386863 states have (on average 4.774356813652378) internal successors, (1847022), 386863 states have internal predecessors, (1847022), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:52:20,169 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 386864 states to 386864 states and 1847022 transitions. [2021-02-19 19:52:20,169 INFO L78 Accepts]: Start accepts. Automaton has 386864 states and 1847022 transitions. Word has length 38 [2021-02-19 19:52:20,170 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 19:52:20,181 INFO L480 AbstractCegarLoop]: Abstraction has 386864 states and 1847022 transitions. [2021-02-19 19:52:20,182 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 5.0) internal successors, (45), 9 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:52:20,182 INFO L276 IsEmpty]: Start isEmpty. Operand 386864 states and 1847022 transitions. [2021-02-19 19:52:22,486 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-02-19 19:52:22,486 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 19:52:22,486 INFO L506 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 19:52:22,708 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-02-19 19:52:22,708 INFO L428 AbstractCegarLoop]: === Iteration 25 === [ULTIMATE.startErr3INUSE_VIOLATION, ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 19:52:22,708 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 19:52:22,709 INFO L82 PathProgramCache]: Analyzing trace with hash -1379919838, now seen corresponding path program 16 times [2021-02-19 19:52:22,709 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 19:52:22,709 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [818991430] [2021-02-19 19:52:22,709 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 19:52:22,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:52:22,831 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 3 proven. 12 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-02-19 19:52:22,832 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [818991430] [2021-02-19 19:52:22,832 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1152827832] [2021-02-19 19:52:22,832 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 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 [2021-02-19 19:52:22,878 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-02-19 19:52:22,878 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 19:52:22,879 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 8 conjunts are in the unsatisfiable core [2021-02-19 19:52:22,880 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 19:52:23,076 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 6 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-02-19 19:52:23,076 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 19:52:23,076 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 16 [2021-02-19 19:52:23,076 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [155312201] [2021-02-19 19:52:23,076 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-02-19 19:52:23,076 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 19:52:23,077 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-02-19 19:52:23,077 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=205, Unknown=0, NotChecked=0, Total=272 [2021-02-19 19:52:23,077 INFO L87 Difference]: Start difference. First operand 386864 states and 1847022 transitions. Second operand has 17 states, 17 states have (on average 3.411764705882353) internal successors, (58), 16 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:52:37,810 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 19:52:37,810 INFO L93 Difference]: Finished difference Result 1120732 states and 5108769 transitions. [2021-02-19 19:52:37,810 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-02-19 19:52:37,811 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 3.411764705882353) internal successors, (58), 16 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 40 [2021-02-19 19:52:37,811 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 19:52:44,729 INFO L225 Difference]: With dead ends: 1120732 [2021-02-19 19:52:44,729 INFO L226 Difference]: Without dead ends: 1114512 [2021-02-19 19:52:44,730 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 193 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=270, Invalid=722, Unknown=0, NotChecked=0, Total=992 [2021-02-19 19:52:47,761 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1114512 states. [2021-02-19 19:53:09,687 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1114512 to 448533. [2021-02-19 19:53:10,870 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 448533 states, 448532 states have (on average 4.7567286169102765) internal successors, (2133545), 448532 states have internal predecessors, (2133545), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:53:16,934 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 448533 states to 448533 states and 2133545 transitions. [2021-02-19 19:53:16,934 INFO L78 Accepts]: Start accepts. Automaton has 448533 states and 2133545 transitions. Word has length 40 [2021-02-19 19:53:16,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 19:53:16,935 INFO L480 AbstractCegarLoop]: Abstraction has 448533 states and 2133545 transitions. [2021-02-19 19:53:16,935 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 3.411764705882353) internal successors, (58), 16 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:53:16,935 INFO L276 IsEmpty]: Start isEmpty. Operand 448533 states and 2133545 transitions. [2021-02-19 19:53:20,449 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-02-19 19:53:20,450 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 19:53:20,450 INFO L506 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 19:53:20,658 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-02-19 19:53:20,658 INFO L428 AbstractCegarLoop]: === Iteration 26 === [ULTIMATE.startErr3INUSE_VIOLATION, ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 19:53:20,658 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 19:53:20,658 INFO L82 PathProgramCache]: Analyzing trace with hash 1703267174, now seen corresponding path program 17 times [2021-02-19 19:53:20,658 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 19:53:20,658 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [216339604] [2021-02-19 19:53:20,659 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 19:53:20,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:53:20,773 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 11 proven. 4 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-02-19 19:53:20,773 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [216339604] [2021-02-19 19:53:20,773 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1419616526] [2021-02-19 19:53:20,773 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 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 [2021-02-19 19:53:20,832 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-02-19 19:53:20,832 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 19:53:20,833 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 10 conjunts are in the unsatisfiable core [2021-02-19 19:53:20,833 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 19:53:21,004 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 4 proven. 11 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-02-19 19:53:21,005 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 19:53:21,005 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 15 [2021-02-19 19:53:21,005 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [710446828] [2021-02-19 19:53:21,006 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-02-19 19:53:21,006 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 19:53:21,007 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-02-19 19:53:21,007 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=195, Unknown=0, NotChecked=0, Total=240 [2021-02-19 19:53:21,007 INFO L87 Difference]: Start difference. First operand 448533 states and 2133545 transitions. Second operand has 16 states, 16 states have (on average 4.1875) internal successors, (67), 15 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:53:44,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 19:53:44,874 INFO L93 Difference]: Finished difference Result 1565237 states and 7251935 transitions. [2021-02-19 19:53:44,874 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2021-02-19 19:53:44,874 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 4.1875) internal successors, (67), 15 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 40 [2021-02-19 19:53:44,875 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 19:54:02,490 INFO L225 Difference]: With dead ends: 1565237 [2021-02-19 19:54:02,491 INFO L226 Difference]: Without dead ends: 1521056 [2021-02-19 19:54:02,492 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2033 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1278, Invalid=4574, Unknown=0, NotChecked=0, Total=5852 [2021-02-19 19:54:05,154 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1521056 states. [2021-02-19 19:54:41,769 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1521056 to 810028. [2021-02-19 19:54:44,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 810028 states, 810027 states have (on average 4.736152004809716) internal successors, (3836411), 810027 states have internal predecessors, (3836411), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:54:55,572 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 810028 states to 810028 states and 3836411 transitions. [2021-02-19 19:54:55,572 INFO L78 Accepts]: Start accepts. Automaton has 810028 states and 3836411 transitions. Word has length 40 [2021-02-19 19:54:55,572 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 19:54:55,572 INFO L480 AbstractCegarLoop]: Abstraction has 810028 states and 3836411 transitions. [2021-02-19 19:54:55,572 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 4.1875) internal successors, (67), 15 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 19:54:55,572 INFO L276 IsEmpty]: Start isEmpty. Operand 810028 states and 3836411 transitions. [2021-02-19 19:55:01,595 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-02-19 19:55:01,595 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 19:55:01,595 INFO L506 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 19:55:01,830 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 19:55:01,830 INFO L428 AbstractCegarLoop]: === Iteration 27 === [ULTIMATE.startErr3INUSE_VIOLATION, ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 19:55:01,830 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 19:55:01,830 INFO L82 PathProgramCache]: Analyzing trace with hash 185085450, now seen corresponding path program 18 times [2021-02-19 19:55:01,830 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 19:55:01,831 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [719898765] [2021-02-19 19:55:01,831 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 19:55:01,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 19:55:01,921 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-02-19 19:55:01,922 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [719898765] [2021-02-19 19:55:01,922 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [626486917] [2021-02-19 19:55:01,922 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 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 19:55:01,959 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 6 check-sat command(s) [2021-02-19 19:55:01,959 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 19:55:01,959 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 8 conjunts are in the unsatisfiable core [2021-02-19 19:55:01,960 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 19:55:03,143 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-02-19 19:55:03,144 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 19:55:03,144 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8] total 14 [2021-02-19 19:55:03,144 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [197830927] [2021-02-19 19:55:03,144 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-02-19 19:55:03,144 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 19:55:03,144 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-02-19 19:55:03,145 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-02-19 19:55:03,145 INFO L87 Difference]: Start difference. First operand 810028 states and 3836411 transitions. Second operand has 15 states, 15 states have (on average 4.066666666666666) internal successors, (61), 14 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)