/usr/bin/java -Xmx16000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -s ../../../trunk/examples/settings/automizer/concurrent/svcomp-Reach-32bit-Automizer_Default-noMmResRef-FA-NoLbe-Separate.epf -tc ../../../trunk/examples/toolchains/AutomizerBplInline.xml -i ../../../trunk/examples/concurrent/bpl/weaver-benchmarks/generated/popl20-more/array-sum-alt.wvr.bpl -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-770125f [2021-05-22 02:51:36,947 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-22 02:51:36,949 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-22 02:51:36,984 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-22 02:51:37,038 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/concurrent/svcomp-Reach-32bit-Automizer_Default-noMmResRef-FA-NoLbe-Separate.epf [2021-05-22 02:51:37,058 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-22 02:51:37,058 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-22 02:51:37,059 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-05-22 02:51:37,059 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-05-22 02:51:37,060 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-22 02:51:37,060 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-22 02:51:37,060 INFO L138 SettingsManager]: * Use SBE=true [2021-05-22 02:51:37,060 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-22 02:51:37,060 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-22 02:51:37,060 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-22 02:51:37,061 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-22 02:51:37,061 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-22 02:51:37,061 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-22 02:51:37,061 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-22 02:51:37,061 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-22 02:51:37,061 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-22 02:51:37,061 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-22 02:51:37,061 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-22 02:51:37,062 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-22 02:51:37,062 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-22 02:51:37,062 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-22 02:51:37,062 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-22 02:51:37,062 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-22 02:51:37,062 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-22 02:51:37,062 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-22 02:51:37,062 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-22 02:51:37,063 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-22 02:51:37,063 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-22 02:51:37,063 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-22 02:51:37,063 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-05-22 02:51:37,063 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-22 02:51:37,063 INFO L138 SettingsManager]: * Check the insufficient thread errors last=true [2021-05-22 02:51:37,063 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-05-22 02:51:37,370 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-22 02:51:37,393 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-22 02:51:37,395 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-22 02:51:37,396 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2021-05-22 02:51:37,398 INFO L275 PluginConnector]: Boogie PL CUP Parser initialized [2021-05-22 02:51:37,398 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/weaver-benchmarks/generated/popl20-more/array-sum-alt.wvr.bpl [2021-05-22 02:51:37,408 INFO L110 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/weaver-benchmarks/generated/popl20-more/array-sum-alt.wvr.bpl' [2021-05-22 02:51:37,451 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-22 02:51:37,453 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-22 02:51:37,454 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-05-22 02:51:37,454 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-05-22 02:51:37,454 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-05-22 02:51:37,466 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "array-sum-alt.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 22.05 02:51:37" (1/1) ... [2021-05-22 02:51:37,473 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "array-sum-alt.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 22.05 02:51:37" (1/1) ... [2021-05-22 02:51:37,479 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-05-22 02:51:37,481 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-22 02:51:37,481 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-22 02:51:37,482 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-22 02:51:37,488 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "array-sum-alt.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 22.05 02:51:37" (1/1) ... [2021-05-22 02:51:37,489 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "array-sum-alt.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 22.05 02:51:37" (1/1) ... [2021-05-22 02:51:37,490 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "array-sum-alt.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 22.05 02:51:37" (1/1) ... [2021-05-22 02:51:37,490 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "array-sum-alt.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 22.05 02:51:37" (1/1) ... [2021-05-22 02:51:37,493 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "array-sum-alt.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 22.05 02:51:37" (1/1) ... [2021-05-22 02:51:37,497 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "array-sum-alt.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 22.05 02:51:37" (1/1) ... [2021-05-22 02:51:37,497 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "array-sum-alt.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 22.05 02:51:37" (1/1) ... [2021-05-22 02:51:37,499 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-22 02:51:37,500 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-22 02:51:37,500 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-22 02:51:37,501 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-22 02:51:37,502 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "array-sum-alt.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 22.05 02:51:37" (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 [2021-05-22 02:51:37,565 INFO L124 BoogieDeclarations]: Specification and implementation of procedure thread1 given in one single declaration [2021-05-22 02:51:37,565 INFO L130 BoogieDeclarations]: Found specification of procedure thread1 [2021-05-22 02:51:37,565 INFO L138 BoogieDeclarations]: Found implementation of procedure thread1 [2021-05-22 02:51:37,565 INFO L124 BoogieDeclarations]: Specification and implementation of procedure thread2 given in one single declaration [2021-05-22 02:51:37,566 INFO L130 BoogieDeclarations]: Found specification of procedure thread2 [2021-05-22 02:51:37,566 INFO L138 BoogieDeclarations]: Found implementation of procedure thread2 [2021-05-22 02:51:37,566 INFO L124 BoogieDeclarations]: Specification and implementation of procedure ULTIMATE.start given in one single declaration [2021-05-22 02:51:37,566 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-22 02:51:37,566 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-22 02:51:37,566 INFO L124 BoogieDeclarations]: Specification and implementation of procedure thread3 given in one single declaration [2021-05-22 02:51:37,566 INFO L130 BoogieDeclarations]: Found specification of procedure thread3 [2021-05-22 02:51:37,566 INFO L138 BoogieDeclarations]: Found implementation of procedure thread3 [2021-05-22 02:51:37,567 WARN L209 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to SingleStatement [2021-05-22 02:51:37,727 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-22 02:51:37,728 INFO L299 CfgBuilder]: Removed 0 assume(true) statements. [2021-05-22 02:51:37,729 INFO L202 PluginConnector]: Adding new model array-sum-alt.wvr.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.05 02:51:37 BoogieIcfgContainer [2021-05-22 02:51:37,729 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-22 02:51:37,730 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-22 02:51:37,731 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-22 02:51:37,733 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-22 02:51:37,733 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "array-sum-alt.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 22.05 02:51:37" (1/2) ... [2021-05-22 02:51:37,734 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@e905fa5 and model type array-sum-alt.wvr.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.05 02:51:37, skipping insertion in model container [2021-05-22 02:51:37,734 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "array-sum-alt.wvr.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.05 02:51:37" (2/2) ... [2021-05-22 02:51:37,735 INFO L111 eAbstractionObserver]: Analyzing ICFG array-sum-alt.wvr.bpl [2021-05-22 02:51:37,740 WARN L148 ceAbstractionStarter]: Switching off computation of Hoare annotation because input is a concurrent program [2021-05-22 02:51:37,740 INFO L214 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-22 02:51:37,740 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-05-22 02:51:37,741 INFO L478 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2021-05-22 02:51:37,793 INFO L149 ThreadInstanceAdder]: Constructed 3 joinOtherThreadTransitions. [2021-05-22 02:51:37,828 INFO L255 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-22 02:51:37,852 INFO L378 AbstractCegarLoop]: Interprodecural is true [2021-05-22 02:51:37,852 INFO L379 AbstractCegarLoop]: Hoare is false [2021-05-22 02:51:37,852 INFO L380 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-22 02:51:37,852 INFO L381 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-22 02:51:37,884 INFO L382 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-22 02:51:37,891 INFO L383 AbstractCegarLoop]: Difference is false [2021-05-22 02:51:37,891 INFO L384 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-22 02:51:37,891 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-22 02:51:37,899 INFO L100 iNet2FiniteAutomaton]: Start petriNet2FiniteAutomaton. Operand has 39 places, 32 transitions, 88 flow [2021-05-22 02:51:37,935 INFO L122 iNet2FiniteAutomaton]: Finished petriNet2FiniteAutomaton. Result has 195 states, 193 states have (on average 2.8756476683937824) internal successors, (555), 194 states have internal predecessors, (555), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:51:37,940 INFO L276 IsEmpty]: Start isEmpty. Operand has 195 states, 193 states have (on average 2.8756476683937824) internal successors, (555), 194 states have internal predecessors, (555), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:51:37,948 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-22 02:51:37,949 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:51:37,949 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:51:37,950 INFO L430 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:51:37,954 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:51:37,954 INFO L82 PathProgramCache]: Analyzing trace with hash -2112338189, now seen corresponding path program 1 times [2021-05-22 02:51:37,960 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:51:37,960 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2119319641] [2021-05-22 02:51:37,961 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:51:38,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:51:38,073 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:51:38,074 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:51:38,074 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2119319641] [2021-05-22 02:51:38,074 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2119319641] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-22 02:51:38,075 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-22 02:51:38,075 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-22 02:51:38,075 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1913843316] [2021-05-22 02:51:38,079 INFO L462 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-22 02:51:38,079 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:51:38,088 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-22 02:51:38,089 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-22 02:51:38,091 INFO L87 Difference]: Start difference. First operand has 195 states, 193 states have (on average 2.8756476683937824) internal successors, (555), 194 states have internal predecessors, (555), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 6.0) internal successors, (18), 3 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:51:38,140 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:51:38,140 INFO L93 Difference]: Finished difference Result 298 states and 858 transitions. [2021-05-22 02:51:38,141 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-22 02:51:38,142 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 6.0) internal successors, (18), 3 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2021-05-22 02:51:38,142 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:51:38,159 INFO L225 Difference]: With dead ends: 298 [2021-05-22 02:51:38,159 INFO L226 Difference]: Without dead ends: 283 [2021-05-22 02:51:38,161 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 7.4ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-22 02:51:38,175 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 283 states. [2021-05-22 02:51:38,226 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 283 to 230. [2021-05-22 02:51:38,228 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 230 states, 229 states have (on average 2.8820960698689957) internal successors, (660), 229 states have internal predecessors, (660), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:51:38,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 230 states to 230 states and 660 transitions. [2021-05-22 02:51:38,231 INFO L78 Accepts]: Start accepts. Automaton has 230 states and 660 transitions. Word has length 18 [2021-05-22 02:51:38,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:51:38,234 INFO L482 AbstractCegarLoop]: Abstraction has 230 states and 660 transitions. [2021-05-22 02:51:38,234 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 6.0) internal successors, (18), 3 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:51:38,234 INFO L276 IsEmpty]: Start isEmpty. Operand 230 states and 660 transitions. [2021-05-22 02:51:38,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:51:38,242 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:51:38,242 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:51:38,243 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-22 02:51:38,243 INFO L430 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:51:38,246 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:51:38,246 INFO L82 PathProgramCache]: Analyzing trace with hash -1377866598, now seen corresponding path program 1 times [2021-05-22 02:51:38,246 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:51:38,247 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1204637927] [2021-05-22 02:51:38,247 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:51:38,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:51:38,391 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:51:38,391 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:51:38,391 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1204637927] [2021-05-22 02:51:38,392 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1204637927] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:51:38,392 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1876901763] [2021-05-22 02:51:38,392 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2021-05-22 02:51:38,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:51:38,453 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-22 02:51:38,457 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:51:38,636 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:51:38,636 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1876901763] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:51:38,636 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:51:38,636 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 10 [2021-05-22 02:51:38,637 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [179331240] [2021-05-22 02:51:38,638 INFO L462 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-22 02:51:38,638 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:51:38,638 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-22 02:51:38,639 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2021-05-22 02:51:38,639 INFO L87 Difference]: Start difference. First operand 230 states and 660 transitions. Second operand has 10 states, 10 states have (on average 3.3) internal successors, (33), 10 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:51:38,984 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:51:38,984 INFO L93 Difference]: Finished difference Result 1019 states and 2933 transitions. [2021-05-22 02:51:38,984 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-22 02:51:38,985 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.3) internal successors, (33), 10 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:51:38,985 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:51:38,992 INFO L225 Difference]: With dead ends: 1019 [2021-05-22 02:51:38,992 INFO L226 Difference]: Without dead ends: 1019 [2021-05-22 02:51:38,994 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 18 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 198.8ms TimeCoverageRelationStatistics Valid=129, Invalid=291, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:51:38,999 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1019 states. [2021-05-22 02:51:39,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1019 to 253. [2021-05-22 02:51:39,022 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 253 states, 252 states have (on average 2.9523809523809526) internal successors, (744), 252 states have internal predecessors, (744), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:51:39,024 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 253 states to 253 states and 744 transitions. [2021-05-22 02:51:39,024 INFO L78 Accepts]: Start accepts. Automaton has 253 states and 744 transitions. Word has length 21 [2021-05-22 02:51:39,024 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:51:39,024 INFO L482 AbstractCegarLoop]: Abstraction has 253 states and 744 transitions. [2021-05-22 02:51:39,024 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.3) internal successors, (33), 10 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:51:39,030 INFO L276 IsEmpty]: Start isEmpty. Operand 253 states and 744 transitions. [2021-05-22 02:51:39,031 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:51:39,031 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:51:39,031 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:51:39,248 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-05-22 02:51:39,249 INFO L430 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:51:39,249 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:51:39,250 INFO L82 PathProgramCache]: Analyzing trace with hash -1571767266, now seen corresponding path program 2 times [2021-05-22 02:51:39,250 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:51:39,250 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [314139912] [2021-05-22 02:51:39,250 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:51:39,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:51:39,329 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:51:39,329 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:51:39,330 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [314139912] [2021-05-22 02:51:39,330 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [314139912] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:51:39,330 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [828860895] [2021-05-22 02:51:39,330 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:51:39,368 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:51:39,368 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:51:39,369 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-22 02:51:39,370 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:51:39,442 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:51:39,442 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [828860895] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:51:39,442 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:51:39,443 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 10 [2021-05-22 02:51:39,443 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [642467469] [2021-05-22 02:51:39,443 INFO L462 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-22 02:51:39,443 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:51:39,444 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-22 02:51:39,444 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2021-05-22 02:51:39,444 INFO L87 Difference]: Start difference. First operand 253 states and 744 transitions. Second operand has 10 states, 10 states have (on average 3.3) internal successors, (33), 10 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:51:39,721 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:51:39,721 INFO L93 Difference]: Finished difference Result 1035 states and 2973 transitions. [2021-05-22 02:51:39,721 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-22 02:51:39,721 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.3) internal successors, (33), 10 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:51:39,722 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:51:39,726 INFO L225 Difference]: With dead ends: 1035 [2021-05-22 02:51:39,727 INFO L226 Difference]: Without dead ends: 1035 [2021-05-22 02:51:39,727 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 18 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 155.4ms TimeCoverageRelationStatistics Valid=129, Invalid=291, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:51:39,731 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1035 states. [2021-05-22 02:51:39,744 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1035 to 252. [2021-05-22 02:51:39,745 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 252 states, 251 states have (on average 2.9362549800796813) internal successors, (737), 251 states have internal predecessors, (737), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:51:39,746 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 252 states to 252 states and 737 transitions. [2021-05-22 02:51:39,746 INFO L78 Accepts]: Start accepts. Automaton has 252 states and 737 transitions. Word has length 21 [2021-05-22 02:51:39,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:51:39,746 INFO L482 AbstractCegarLoop]: Abstraction has 252 states and 737 transitions. [2021-05-22 02:51:39,746 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.3) internal successors, (33), 10 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:51:39,746 INFO L276 IsEmpty]: Start isEmpty. Operand 252 states and 737 transitions. [2021-05-22 02:51:39,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:51:39,747 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:51:39,747 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:51:39,968 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:51:39,969 INFO L430 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:51:39,969 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:51:39,969 INFO L82 PathProgramCache]: Analyzing trace with hash -120635141, now seen corresponding path program 1 times [2021-05-22 02:51:39,969 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:51:39,970 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1752785103] [2021-05-22 02:51:39,970 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:51:39,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:51:40,011 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:51:40,012 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:51:40,012 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1752785103] [2021-05-22 02:51:40,012 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1752785103] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-22 02:51:40,012 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-22 02:51:40,012 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-22 02:51:40,012 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1831219724] [2021-05-22 02:51:40,013 INFO L462 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-22 02:51:40,013 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:51:40,013 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-22 02:51:40,013 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-22 02:51:40,013 INFO L87 Difference]: Start difference. First operand 252 states and 737 transitions. Second operand has 5 states, 5 states have (on average 4.2) internal successors, (21), 5 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:51:40,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:51:40,099 INFO L93 Difference]: Finished difference Result 483 states and 1371 transitions. [2021-05-22 02:51:40,100 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-22 02:51:40,100 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.2) internal successors, (21), 5 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:51:40,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:51:40,103 INFO L225 Difference]: With dead ends: 483 [2021-05-22 02:51:40,103 INFO L226 Difference]: Without dead ends: 477 [2021-05-22 02:51:40,103 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 28.9ms TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-05-22 02:51:40,105 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 477 states. [2021-05-22 02:51:40,113 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 477 to 327. [2021-05-22 02:51:40,114 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 327 states, 326 states have (on average 2.941717791411043) internal successors, (959), 326 states have internal predecessors, (959), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:51:40,116 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 327 states to 327 states and 959 transitions. [2021-05-22 02:51:40,116 INFO L78 Accepts]: Start accepts. Automaton has 327 states and 959 transitions. Word has length 21 [2021-05-22 02:51:40,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:51:40,116 INFO L482 AbstractCegarLoop]: Abstraction has 327 states and 959 transitions. [2021-05-22 02:51:40,117 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 4.2) internal successors, (21), 5 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:51:40,117 INFO L276 IsEmpty]: Start isEmpty. Operand 327 states and 959 transitions. [2021-05-22 02:51:40,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:51:40,118 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:51:40,118 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:51:40,119 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-05-22 02:51:40,119 INFO L430 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:51:40,120 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:51:40,120 INFO L82 PathProgramCache]: Analyzing trace with hash -1682109104, now seen corresponding path program 1 times [2021-05-22 02:51:40,120 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:51:40,120 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [153108468] [2021-05-22 02:51:40,120 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:51:40,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:51:40,175 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:51:40,175 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:51:40,176 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [153108468] [2021-05-22 02:51:40,176 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [153108468] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-22 02:51:40,176 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-22 02:51:40,176 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-22 02:51:40,176 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1931022328] [2021-05-22 02:51:40,176 INFO L462 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-22 02:51:40,176 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:51:40,176 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-22 02:51:40,177 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-05-22 02:51:40,177 INFO L87 Difference]: Start difference. First operand 327 states and 959 transitions. Second operand has 6 states, 6 states have (on average 3.5) internal successors, (21), 5 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:51:40,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:51:40,268 INFO L93 Difference]: Finished difference Result 539 states and 1537 transitions. [2021-05-22 02:51:40,269 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-22 02:51:40,269 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.5) internal successors, (21), 5 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:51:40,269 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:51:40,272 INFO L225 Difference]: With dead ends: 539 [2021-05-22 02:51:40,272 INFO L226 Difference]: Without dead ends: 521 [2021-05-22 02:51:40,272 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 39.4ms TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2021-05-22 02:51:40,274 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 521 states. [2021-05-22 02:51:40,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 521 to 398. [2021-05-22 02:51:40,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 398 states, 397 states have (on average 2.929471032745592) internal successors, (1163), 397 states have internal predecessors, (1163), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:51:40,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 398 states to 398 states and 1163 transitions. [2021-05-22 02:51:40,284 INFO L78 Accepts]: Start accepts. Automaton has 398 states and 1163 transitions. Word has length 21 [2021-05-22 02:51:40,284 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:51:40,284 INFO L482 AbstractCegarLoop]: Abstraction has 398 states and 1163 transitions. [2021-05-22 02:51:40,284 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 3.5) internal successors, (21), 5 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:51:40,284 INFO L276 IsEmpty]: Start isEmpty. Operand 398 states and 1163 transitions. [2021-05-22 02:51:40,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:51:40,285 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:51:40,286 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:51:40,286 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-05-22 02:51:40,286 INFO L430 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:51:40,286 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:51:40,286 INFO L82 PathProgramCache]: Analyzing trace with hash -1479238087, now seen corresponding path program 2 times [2021-05-22 02:51:40,286 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:51:40,287 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [203777014] [2021-05-22 02:51:40,287 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:51:40,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:51:40,315 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:51:40,315 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:51:40,315 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [203777014] [2021-05-22 02:51:40,315 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [203777014] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-22 02:51:40,315 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-22 02:51:40,316 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-22 02:51:40,316 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [955585009] [2021-05-22 02:51:40,316 INFO L462 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-22 02:51:40,316 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:51:40,316 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-22 02:51:40,317 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-22 02:51:40,317 INFO L87 Difference]: Start difference. First operand 398 states and 1163 transitions. Second operand has 5 states, 5 states have (on average 4.2) internal successors, (21), 5 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:51:40,361 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:51:40,362 INFO L93 Difference]: Finished difference Result 486 states and 1392 transitions. [2021-05-22 02:51:40,362 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-22 02:51:40,362 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.2) internal successors, (21), 5 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:51:40,362 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:51:40,365 INFO L225 Difference]: With dead ends: 486 [2021-05-22 02:51:40,365 INFO L226 Difference]: Without dead ends: 486 [2021-05-22 02:51:40,365 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 18.1ms TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-05-22 02:51:40,366 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 486 states. [2021-05-22 02:51:40,373 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 486 to 362. [2021-05-22 02:51:40,374 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 362 states, 361 states have (on average 2.9418282548476453) internal successors, (1062), 361 states have internal predecessors, (1062), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:51:40,375 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 362 states to 362 states and 1062 transitions. [2021-05-22 02:51:40,376 INFO L78 Accepts]: Start accepts. Automaton has 362 states and 1062 transitions. Word has length 21 [2021-05-22 02:51:40,376 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:51:40,376 INFO L482 AbstractCegarLoop]: Abstraction has 362 states and 1062 transitions. [2021-05-22 02:51:40,376 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 4.2) internal successors, (21), 5 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:51:40,376 INFO L276 IsEmpty]: Start isEmpty. Operand 362 states and 1062 transitions. [2021-05-22 02:51:40,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:51:40,377 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:51:40,377 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:51:40,378 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-05-22 02:51:40,378 INFO L430 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:51:40,378 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:51:40,378 INFO L82 PathProgramCache]: Analyzing trace with hash -314434059, now seen corresponding path program 3 times [2021-05-22 02:51:40,378 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:51:40,379 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1371485767] [2021-05-22 02:51:40,379 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:51:40,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:51:40,423 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:51:40,423 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:51:40,423 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1371485767] [2021-05-22 02:51:40,423 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1371485767] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-22 02:51:40,423 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-22 02:51:40,423 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-22 02:51:40,424 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2008964386] [2021-05-22 02:51:40,424 INFO L462 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-22 02:51:40,424 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:51:40,447 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-22 02:51:40,447 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-22 02:51:40,447 INFO L87 Difference]: Start difference. First operand 362 states and 1062 transitions. Second operand has 6 states, 6 states have (on average 3.5) internal successors, (21), 6 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:51:40,524 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:51:40,524 INFO L93 Difference]: Finished difference Result 438 states and 1246 transitions. [2021-05-22 02:51:40,526 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-22 02:51:40,527 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.5) internal successors, (21), 6 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:51:40,527 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:51:40,529 INFO L225 Difference]: With dead ends: 438 [2021-05-22 02:51:40,529 INFO L226 Difference]: Without dead ends: 438 [2021-05-22 02:51:40,529 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 37.9ms TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-05-22 02:51:40,531 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 438 states. [2021-05-22 02:51:40,538 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 438 to 323. [2021-05-22 02:51:40,539 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 323 states, 322 states have (on average 2.8975155279503104) internal successors, (933), 322 states have internal predecessors, (933), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:51:40,540 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 323 states to 323 states and 933 transitions. [2021-05-22 02:51:40,540 INFO L78 Accepts]: Start accepts. Automaton has 323 states and 933 transitions. Word has length 21 [2021-05-22 02:51:40,540 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:51:40,541 INFO L482 AbstractCegarLoop]: Abstraction has 323 states and 933 transitions. [2021-05-22 02:51:40,541 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 3.5) internal successors, (21), 6 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:51:40,541 INFO L276 IsEmpty]: Start isEmpty. Operand 323 states and 933 transitions. [2021-05-22 02:51:40,542 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:51:40,542 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:51:40,542 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:51:40,542 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-05-22 02:51:40,542 INFO L430 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:51:40,543 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:51:40,543 INFO L82 PathProgramCache]: Analyzing trace with hash -1825817224, now seen corresponding path program 3 times [2021-05-22 02:51:40,543 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:51:40,543 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1460025701] [2021-05-22 02:51:40,543 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:51:40,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:51:40,578 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:51:40,578 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:51:40,578 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1460025701] [2021-05-22 02:51:40,578 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1460025701] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:51:40,578 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1909411603] [2021-05-22 02:51:40,579 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:51:40,619 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-22 02:51:40,619 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:51:40,620 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-22 02:51:40,621 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:51:40,701 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:51:40,702 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1909411603] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:51:40,702 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:51:40,702 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 8 [2021-05-22 02:51:40,702 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [225855215] [2021-05-22 02:51:40,702 INFO L462 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-22 02:51:40,702 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:51:40,703 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-22 02:51:40,703 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2021-05-22 02:51:40,703 INFO L87 Difference]: Start difference. First operand 323 states and 933 transitions. Second operand has 8 states, 8 states have (on average 3.375) internal successors, (27), 8 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:51:40,973 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:51:40,973 INFO L93 Difference]: Finished difference Result 994 states and 2769 transitions. [2021-05-22 02:51:40,973 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-22 02:51:40,973 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.375) internal successors, (27), 8 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:51:40,974 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:51:40,978 INFO L225 Difference]: With dead ends: 994 [2021-05-22 02:51:40,978 INFO L226 Difference]: Without dead ends: 994 [2021-05-22 02:51:40,978 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 125.2ms TimeCoverageRelationStatistics Valid=107, Invalid=235, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:51:40,981 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 994 states. [2021-05-22 02:51:40,990 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 994 to 323. [2021-05-22 02:51:40,991 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 323 states, 322 states have (on average 2.8975155279503104) internal successors, (933), 322 states have internal predecessors, (933), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:51:40,992 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 323 states to 323 states and 933 transitions. [2021-05-22 02:51:40,992 INFO L78 Accepts]: Start accepts. Automaton has 323 states and 933 transitions. Word has length 21 [2021-05-22 02:51:40,992 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:51:40,992 INFO L482 AbstractCegarLoop]: Abstraction has 323 states and 933 transitions. [2021-05-22 02:51:40,992 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 3.375) internal successors, (27), 8 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:51:40,992 INFO L276 IsEmpty]: Start isEmpty. Operand 323 states and 933 transitions. [2021-05-22 02:51:40,993 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:51:40,994 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:51:40,994 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:51:41,216 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:51:41,217 INFO L430 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:51:41,217 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:51:41,217 INFO L82 PathProgramCache]: Analyzing trace with hash 156862832, now seen corresponding path program 2 times [2021-05-22 02:51:41,217 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:51:41,217 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [361256243] [2021-05-22 02:51:41,217 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:51:41,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:51:41,272 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:51:41,274 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:51:41,274 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [361256243] [2021-05-22 02:51:41,274 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [361256243] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-22 02:51:41,274 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-22 02:51:41,274 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-22 02:51:41,274 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [32498815] [2021-05-22 02:51:41,274 INFO L462 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-22 02:51:41,275 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:51:41,275 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-22 02:51:41,278 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-05-22 02:51:41,278 INFO L87 Difference]: Start difference. First operand 323 states and 933 transitions. Second operand has 7 states, 7 states have (on average 3.0) internal successors, (21), 6 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:51:41,414 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:51:41,414 INFO L93 Difference]: Finished difference Result 466 states and 1366 transitions. [2021-05-22 02:51:41,417 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:51:41,418 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.0) internal successors, (21), 6 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:51:41,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:51:41,420 INFO L225 Difference]: With dead ends: 466 [2021-05-22 02:51:41,420 INFO L226 Difference]: Without dead ends: 466 [2021-05-22 02:51:41,420 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 64.7ms TimeCoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2021-05-22 02:51:41,421 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 466 states. [2021-05-22 02:51:41,426 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 466 to 276. [2021-05-22 02:51:41,427 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 276 states, 275 states have (on average 2.92) internal successors, (803), 275 states have internal predecessors, (803), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:51:41,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 276 states to 276 states and 803 transitions. [2021-05-22 02:51:41,428 INFO L78 Accepts]: Start accepts. Automaton has 276 states and 803 transitions. Word has length 21 [2021-05-22 02:51:41,429 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:51:41,429 INFO L482 AbstractCegarLoop]: Abstraction has 276 states and 803 transitions. [2021-05-22 02:51:41,429 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 3.0) internal successors, (21), 6 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:51:41,429 INFO L276 IsEmpty]: Start isEmpty. Operand 276 states and 803 transitions. [2021-05-22 02:51:41,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:51:41,430 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:51:41,430 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:51:41,430 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-05-22 02:51:41,430 INFO L430 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:51:41,430 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:51:41,430 INFO L82 PathProgramCache]: Analyzing trace with hash -2015035522, now seen corresponding path program 4 times [2021-05-22 02:51:41,431 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:51:41,431 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1118448428] [2021-05-22 02:51:41,431 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:51:41,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:51:41,459 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:51:41,459 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:51:41,459 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1118448428] [2021-05-22 02:51:41,459 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1118448428] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-22 02:51:41,459 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-22 02:51:41,459 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-22 02:51:41,459 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1076506515] [2021-05-22 02:51:41,460 INFO L462 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-22 02:51:41,460 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:51:41,460 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-22 02:51:41,460 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-05-22 02:51:41,461 INFO L87 Difference]: Start difference. First operand 276 states and 803 transitions. Second operand has 6 states, 6 states have (on average 3.5) internal successors, (21), 6 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:51:41,557 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:51:41,558 INFO L93 Difference]: Finished difference Result 541 states and 1520 transitions. [2021-05-22 02:51:41,558 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:51:41,558 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.5) internal successors, (21), 6 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:51:41,558 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:51:41,561 INFO L225 Difference]: With dead ends: 541 [2021-05-22 02:51:41,561 INFO L226 Difference]: Without dead ends: 537 [2021-05-22 02:51:41,561 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 38.2ms TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2021-05-22 02:51:41,562 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 537 states. [2021-05-22 02:51:41,568 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 537 to 276. [2021-05-22 02:51:41,568 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 276 states, 275 states have (on average 2.9127272727272726) internal successors, (801), 275 states have internal predecessors, (801), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:51:41,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 276 states to 276 states and 801 transitions. [2021-05-22 02:51:41,569 INFO L78 Accepts]: Start accepts. Automaton has 276 states and 801 transitions. Word has length 21 [2021-05-22 02:51:41,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:51:41,570 INFO L482 AbstractCegarLoop]: Abstraction has 276 states and 801 transitions. [2021-05-22 02:51:41,570 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 3.5) internal successors, (21), 6 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:51:41,570 INFO L276 IsEmpty]: Start isEmpty. Operand 276 states and 801 transitions. [2021-05-22 02:51:41,571 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:51:41,571 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:51:41,571 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:51:41,571 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-05-22 02:51:41,571 INFO L430 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:51:41,571 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:51:41,571 INFO L82 PathProgramCache]: Analyzing trace with hash -625514306, now seen corresponding path program 5 times [2021-05-22 02:51:41,572 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:51:41,572 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [570041007] [2021-05-22 02:51:41,572 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:51:41,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:51:41,625 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:51:41,625 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:51:41,626 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [570041007] [2021-05-22 02:51:41,626 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [570041007] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:51:41,626 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1258536592] [2021-05-22 02:51:41,626 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 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 [2021-05-22 02:51:41,659 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:51:41,659 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:51:41,660 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-22 02:51:41,661 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:51:41,742 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:51:41,743 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1258536592] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:51:41,743 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:51:41,743 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 10 [2021-05-22 02:51:41,743 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1002799075] [2021-05-22 02:51:41,743 INFO L462 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-22 02:51:41,744 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:51:41,745 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-22 02:51:41,745 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2021-05-22 02:51:41,745 INFO L87 Difference]: Start difference. First operand 276 states and 801 transitions. Second operand has 10 states, 10 states have (on average 3.1) internal successors, (31), 10 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:51:41,961 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:51:41,961 INFO L93 Difference]: Finished difference Result 760 states and 2180 transitions. [2021-05-22 02:51:41,962 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-22 02:51:41,962 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.1) internal successors, (31), 10 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:51:41,962 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:51:41,965 INFO L225 Difference]: With dead ends: 760 [2021-05-22 02:51:41,965 INFO L226 Difference]: Without dead ends: 760 [2021-05-22 02:51:41,966 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 18 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 110.5ms TimeCoverageRelationStatistics Valid=89, Invalid=183, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:51:41,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 760 states. [2021-05-22 02:51:41,974 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 760 to 278. [2021-05-22 02:51:41,974 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 278 states, 277 states have (on average 2.916967509025271) internal successors, (808), 277 states have internal predecessors, (808), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:51:41,975 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 278 states to 278 states and 808 transitions. [2021-05-22 02:51:41,975 INFO L78 Accepts]: Start accepts. Automaton has 278 states and 808 transitions. Word has length 21 [2021-05-22 02:51:41,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:51:41,976 INFO L482 AbstractCegarLoop]: Abstraction has 278 states and 808 transitions. [2021-05-22 02:51:41,976 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.1) internal successors, (31), 10 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:51:41,976 INFO L276 IsEmpty]: Start isEmpty. Operand 278 states and 808 transitions. [2021-05-22 02:51:41,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:51:41,977 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:51:41,977 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:51:42,192 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:51:42,193 INFO L430 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:51:42,193 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:51:42,193 INFO L82 PathProgramCache]: Analyzing trace with hash 1157135164, now seen corresponding path program 6 times [2021-05-22 02:51:42,193 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:51:42,193 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1698927973] [2021-05-22 02:51:42,193 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:51:42,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:51:42,226 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:51:42,227 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:51:42,227 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1698927973] [2021-05-22 02:51:42,227 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1698927973] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-22 02:51:42,227 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-22 02:51:42,227 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-22 02:51:42,229 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1972959521] [2021-05-22 02:51:42,229 INFO L462 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-22 02:51:42,229 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:51:42,230 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-22 02:51:42,230 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-22 02:51:42,230 INFO L87 Difference]: Start difference. First operand 278 states and 808 transitions. Second operand has 6 states, 6 states have (on average 3.5) internal successors, (21), 6 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:51:42,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:51:42,297 INFO L93 Difference]: Finished difference Result 429 states and 1251 transitions. [2021-05-22 02:51:42,297 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-22 02:51:42,297 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.5) internal successors, (21), 6 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:51:42,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:51:42,299 INFO L225 Difference]: With dead ends: 429 [2021-05-22 02:51:42,299 INFO L226 Difference]: Without dead ends: 425 [2021-05-22 02:51:42,300 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 30.0ms TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-22 02:51:42,301 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 425 states. [2021-05-22 02:51:42,305 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 425 to 278. [2021-05-22 02:51:42,306 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 278 states, 277 states have (on average 2.9097472924187726) internal successors, (806), 277 states have internal predecessors, (806), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:51:42,307 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 278 states to 278 states and 806 transitions. [2021-05-22 02:51:42,307 INFO L78 Accepts]: Start accepts. Automaton has 278 states and 806 transitions. Word has length 21 [2021-05-22 02:51:42,307 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:51:42,307 INFO L482 AbstractCegarLoop]: Abstraction has 278 states and 806 transitions. [2021-05-22 02:51:42,307 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 3.5) internal successors, (21), 6 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:51:42,308 INFO L276 IsEmpty]: Start isEmpty. Operand 278 states and 806 transitions. [2021-05-22 02:51:42,308 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-05-22 02:51:42,308 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:51:42,309 INFO L521 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] [2021-05-22 02:51:42,309 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-05-22 02:51:42,309 INFO L430 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:51:42,309 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:51:42,309 INFO L82 PathProgramCache]: Analyzing trace with hash 1959126516, now seen corresponding path program 1 times [2021-05-22 02:51:42,309 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:51:42,309 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [797451710] [2021-05-22 02:51:42,309 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:51:42,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:51:42,378 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:51:42,378 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:51:42,378 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [797451710] [2021-05-22 02:51:42,378 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [797451710] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:51:42,378 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [271898573] [2021-05-22 02:51:42,379 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:51:42,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:51:42,413 INFO L263 TraceCheckSpWp]: Trace formula consists of 56 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-22 02:51:42,414 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:51:42,488 WARN L348 FreeRefinementEngine]: Global settings require throwing the following exception [2021-05-22 02:51:42,692 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-05-22 02:51:42,693 FATAL L? ?]: The Plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction has thrown an exception: java.lang.NullPointerException at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.EqualityInformation.getEqinfo(EqualityInformation.java:130) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.XnfDer.derSimple(XnfDer.java:308) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.XnfDer.tryToEliminate_EqInfoBased(XnfDer.java:138) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.XnfDer.tryToEliminate(XnfDer.java:101) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.PartialQuantifierElimination.elim(PartialQuantifierElimination.java:255) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.PartialQuantifierElimination.tryToEliminate(PartialQuantifierElimination.java:100) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.predicates.IterativePredicateTransformer$QuantifierEliminationPostprocessor.postprocess(IterativePredicateTransformer.java:246) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.predicates.IterativePredicateTransformer.applyPostprocessors(IterativePredicateTransformer.java:440) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.predicates.IterativePredicateTransformer.computeStrongestPostconditionSequence(IterativePredicateTransformer.java:201) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.singletracecheck.TraceCheckSpWp.computeInterpolantsUsingUnsatCore(TraceCheckSpWp.java:299) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.singletracecheck.TraceCheckSpWp.computeInterpolants(TraceCheckSpWp.java:185) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.singletracecheck.TraceCheckSpWp.(TraceCheckSpWp.java:163) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSpWp.construct(IpTcStrategyModuleSpWp.java:108) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSpWp.construct(IpTcStrategyModuleSpWp.java:1) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:297) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:190) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:180) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:439) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:374) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:69) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:63) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:371) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:307) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseConcurrentProgram(TraceAbstractionStarter.java:236) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:167) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-05-22 02:51:42,695 INFO L168 Benchmark]: Toolchain (without parser) took 5243.00 ms. Allocated memory was 352.3 MB in the beginning and 423.6 MB in the end (delta: 71.3 MB). Free memory was 331.5 MB in the beginning and 275.4 MB in the end (delta: 56.1 MB). Peak memory consumption was 128.9 MB. Max. memory is 16.0 GB. [2021-05-22 02:51:42,696 INFO L168 Benchmark]: Boogie PL CUP Parser took 0.13 ms. Allocated memory is still 352.3 MB. Free memory is still 332.7 MB. There was no memory consumed. Max. memory is 16.0 GB. [2021-05-22 02:51:42,696 INFO L168 Benchmark]: Boogie Procedure Inliner took 25.58 ms. Allocated memory is still 352.3 MB. Free memory was 331.4 MB in the beginning and 330.0 MB in the end (delta: 1.4 MB). There was no memory consumed. Max. memory is 16.0 GB. [2021-05-22 02:51:42,696 INFO L168 Benchmark]: Boogie Preprocessor took 18.12 ms. Allocated memory is still 352.3 MB. Free memory was 330.0 MB in the beginning and 329.0 MB in the end (delta: 950.6 kB). Peak memory consumption was 2.1 MB. Max. memory is 16.0 GB. [2021-05-22 02:51:42,696 INFO L168 Benchmark]: RCFGBuilder took 229.24 ms. Allocated memory is still 352.3 MB. Free memory was 328.9 MB in the beginning and 317.7 MB in the end (delta: 11.3 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.0 GB. [2021-05-22 02:51:42,696 INFO L168 Benchmark]: TraceAbstraction took 4964.36 ms. Allocated memory was 352.3 MB in the beginning and 423.6 MB in the end (delta: 71.3 MB). Free memory was 317.2 MB in the beginning and 275.4 MB in the end (delta: 41.8 MB). Peak memory consumption was 114.2 MB. Max. memory is 16.0 GB. [2021-05-22 02:51:42,697 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * Boogie PL CUP Parser took 0.13 ms. Allocated memory is still 352.3 MB. Free memory is still 332.7 MB. There was no memory consumed. Max. memory is 16.0 GB. * Boogie Procedure Inliner took 25.58 ms. Allocated memory is still 352.3 MB. Free memory was 331.4 MB in the beginning and 330.0 MB in the end (delta: 1.4 MB). There was no memory consumed. Max. memory is 16.0 GB. * Boogie Preprocessor took 18.12 ms. Allocated memory is still 352.3 MB. Free memory was 330.0 MB in the beginning and 329.0 MB in the end (delta: 950.6 kB). Peak memory consumption was 2.1 MB. Max. memory is 16.0 GB. * RCFGBuilder took 229.24 ms. Allocated memory is still 352.3 MB. Free memory was 328.9 MB in the beginning and 317.7 MB in the end (delta: 11.3 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.0 GB. * TraceAbstraction took 4964.36 ms. Allocated memory was 352.3 MB in the beginning and 423.6 MB in the end (delta: 71.3 MB). Free memory was 317.2 MB in the beginning and 275.4 MB in the end (delta: 41.8 MB). Peak memory consumption was 114.2 MB. Max. memory is 16.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - ExceptionOrErrorResult: NullPointerException: null de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: NullPointerException: null: de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.EqualityInformation.getEqinfo(EqualityInformation.java:130) RESULT: Ultimate could not prove your program: Toolchain returned no result. Received shutdown request...