/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks NOT_INCREMENTALLY -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_25-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 11:00:20,201 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 11:00:20,204 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 11:00:20,221 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 11:00:20,221 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 11:00:20,223 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 11:00:20,225 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 11:00:20,228 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 11:00:20,231 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 11:00:20,233 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 11:00:20,234 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 11:00:20,237 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 11:00:20,237 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 11:00:20,239 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 11:00:20,241 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 11:00:20,243 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 11:00:20,245 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 11:00:20,246 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 11:00:20,249 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 11:00:20,252 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 11:00:20,254 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 11:00:20,255 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 11:00:20,257 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 11:00:20,258 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 11:00:20,262 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 11:00:20,274 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 11:00:20,276 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 11:00:20,277 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 11:00:20,278 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 11:00:20,297 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 11:00:20,298 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 11:00:20,300 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 11:00:20,300 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 11:00:20,300 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 11:00:20,301 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 11:00:20,301 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 11:00:20,301 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 11:00:20,301 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 11:00:20,302 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 11:00:20,302 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 11:00:20,302 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 11:00:20,302 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 11:00:20,302 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 11:00:20,303 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 11:00:20,303 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 11:00:20,303 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 11:00:20,303 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 11:00:20,304 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 11:00:20,304 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 11:00:20,304 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 11:00:20,304 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 11:00:20,305 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 11:00:20,305 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 11:00:20,305 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 11:00:20,305 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 11:00:20,306 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:20,306 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 11:00:20,306 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 11:00:20,306 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> NOT_INCREMENTALLY [2020-07-20 11:00:20,668 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 11:00:20,691 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 11:00:20,699 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 11:00:20,701 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 11:00:20,702 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 11:00:20,705 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_25-2.c [2020-07-20 11:00:20,826 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7c0b4ac5d/d2241592e39f479c847afcc2ee0c2c49/FLAG4750db78f [2020-07-20 11:00:21,402 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 11:00:21,403 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_25-2.c [2020-07-20 11:00:21,412 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7c0b4ac5d/d2241592e39f479c847afcc2ee0c2c49/FLAG4750db78f [2020-07-20 11:00:21,664 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7c0b4ac5d/d2241592e39f479c847afcc2ee0c2c49 [2020-07-20 11:00:21,676 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 11:00:21,679 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 11:00:21,681 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 11:00:21,681 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 11:00:21,687 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 11:00:21,689 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 11:00:21" (1/1) ... [2020-07-20 11:00:21,693 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@509fad81 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:00:21, skipping insertion in model container [2020-07-20 11:00:21,694 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 11:00:21" (1/1) ... [2020-07-20 11:00:21,703 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 11:00:21,724 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 11:00:21,907 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 11:00:21,911 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 11:00:21,929 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 11:00:21,944 INFO L208 MainTranslator]: Completed translation [2020-07-20 11:00:21,945 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:00:21 WrapperNode [2020-07-20 11:00:21,945 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 11:00:21,946 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 11:00:21,946 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 11:00:21,947 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 11:00:21,961 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:00:21" (1/1) ... [2020-07-20 11:00:21,961 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:00:21" (1/1) ... [2020-07-20 11:00:21,969 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:00:21" (1/1) ... [2020-07-20 11:00:21,969 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:00:21" (1/1) ... [2020-07-20 11:00:21,973 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:00:21" (1/1) ... [2020-07-20 11:00:21,977 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:00:21" (1/1) ... [2020-07-20 11:00:21,978 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:00:21" (1/1) ... [2020-07-20 11:00:21,980 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 11:00:21,981 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 11:00:21,981 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 11:00:21,981 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 11:00:21,983 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:00:21" (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 [2020-07-20 11:00:22,155 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 11:00:22,156 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 11:00:22,156 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo [2020-07-20 11:00:22,156 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 11:00:22,156 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 11:00:22,156 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 11:00:22,157 INFO L130 BoogieDeclarations]: Found specification of procedure fibo [2020-07-20 11:00:22,157 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 11:00:22,157 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 11:00:22,157 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 11:00:22,495 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 11:00:22,495 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 11:00:22,505 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 11:00:22 BoogieIcfgContainer [2020-07-20 11:00:22,506 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 11:00:22,510 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 11:00:22,511 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 11:00:22,519 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 11:00:22,520 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 11:00:21" (1/3) ... [2020-07-20 11:00:22,522 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3eb72c77 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 11:00:22, skipping insertion in model container [2020-07-20 11:00:22,523 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:00:21" (2/3) ... [2020-07-20 11:00:22,523 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3eb72c77 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 11:00:22, skipping insertion in model container [2020-07-20 11:00:22,523 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 11:00:22" (3/3) ... [2020-07-20 11:00:22,525 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_25-2.c [2020-07-20 11:00:22,542 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 11:00:22,553 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 11:00:22,575 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 11:00:22,611 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 11:00:22,612 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 11:00:22,612 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 11:00:22,612 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 11:00:22,613 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 11:00:22,613 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 11:00:22,613 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 11:00:22,614 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 11:00:22,652 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2020-07-20 11:00:22,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 11:00:22,663 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:22,665 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:22,666 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:22,675 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:22,676 INFO L82 PathProgramCache]: Analyzing trace with hash 537028541, now seen corresponding path program 1 times [2020-07-20 11:00:22,705 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:22,706 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1843804679] [2020-07-20 11:00:22,706 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 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:22,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:22,790 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 11:00:22,798 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:22,904 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 11:00:22,904 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:00:22,905 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1843804679] [2020-07-20 11:00:22,906 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:00:22,907 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 11:00:22,907 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1794008110] [2020-07-20 11:00:22,913 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 11:00:22,913 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:22,925 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 11:00:22,926 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 11:00:22,929 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 5 states. [2020-07-20 11:00:23,063 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:23,063 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2020-07-20 11:00:23,065 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 11:00:23,067 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-20 11:00:23,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:23,079 INFO L225 Difference]: With dead ends: 35 [2020-07-20 11:00:23,079 INFO L226 Difference]: Without dead ends: 21 [2020-07-20 11:00:23,083 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 11:00:23,105 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-20 11:00:23,128 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-20 11:00:23,129 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-20 11:00:23,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-20 11:00:23,133 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2020-07-20 11:00:23,133 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:23,134 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-20 11:00:23,134 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 11:00:23,134 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-20 11:00:23,136 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-20 11:00:23,136 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:23,136 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:23,343 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:23,344 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:23,345 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:23,346 INFO L82 PathProgramCache]: Analyzing trace with hash 179123823, now seen corresponding path program 1 times [2020-07-20 11:00:23,347 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:23,347 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1502240722] [2020-07-20 11:00:23,348 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:23,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:23,376 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 11:00:23,378 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:23,420 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 11:00:23,421 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:00:23,422 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1502240722] [2020-07-20 11:00:23,422 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:00:23,422 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 11:00:23,423 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1487711206] [2020-07-20 11:00:23,425 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 11:00:23,426 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:23,426 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 11:00:23,427 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 11:00:23,427 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 5 states. [2020-07-20 11:00:23,538 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:23,538 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-07-20 11:00:23,540 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 11:00:23,541 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-20 11:00:23,541 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:23,544 INFO L225 Difference]: With dead ends: 27 [2020-07-20 11:00:23,545 INFO L226 Difference]: Without dead ends: 23 [2020-07-20 11:00:23,547 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 11:00:23,549 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-20 11:00:23,564 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2020-07-20 11:00:23,564 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-20 11:00:23,567 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-20 11:00:23,568 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 14 [2020-07-20 11:00:23,569 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:23,569 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-20 11:00:23,569 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 11:00:23,570 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-20 11:00:23,574 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 11:00:23,575 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:23,576 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:23,789 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:23,790 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:23,791 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:23,791 INFO L82 PathProgramCache]: Analyzing trace with hash 806022394, now seen corresponding path program 1 times [2020-07-20 11:00:23,792 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:23,792 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1789544233] [2020-07-20 11:00:23,792 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:23,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:23,832 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 11:00:23,835 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:23,917 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 11:00:23,918 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:24,190 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:24,258 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-20 11:00:24,259 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1789544233] [2020-07-20 11:00:24,260 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:24,260 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-20 11:00:24,260 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1176846305] [2020-07-20 11:00:24,261 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 11:00:24,261 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:24,262 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 11:00:24,262 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-20 11:00:24,262 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 9 states. [2020-07-20 11:00:24,427 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:24,427 INFO L93 Difference]: Finished difference Result 32 states and 42 transitions. [2020-07-20 11:00:24,428 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 11:00:24,428 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-07-20 11:00:24,429 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:24,430 INFO L225 Difference]: With dead ends: 32 [2020-07-20 11:00:24,431 INFO L226 Difference]: Without dead ends: 28 [2020-07-20 11:00:24,432 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 41 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-20 11:00:24,433 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-20 11:00:24,441 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-07-20 11:00:24,442 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-20 11:00:24,444 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-20 11:00:24,445 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 26 [2020-07-20 11:00:24,445 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:24,446 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-20 11:00:24,446 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 11:00:24,446 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-20 11:00:24,447 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 11:00:24,448 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:24,448 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:24,663 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:24,664 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:24,664 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:24,665 INFO L82 PathProgramCache]: Analyzing trace with hash -983862936, now seen corresponding path program 1 times [2020-07-20 11:00:24,665 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:24,665 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [927526967] [2020-07-20 11:00:24,666 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:24,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:24,726 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 11:00:24,728 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:24,763 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-20 11:00:24,764 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:24,929 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:24,986 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-20 11:00:24,986 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [927526967] [2020-07-20 11:00:24,987 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:24,987 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-20 11:00:24,987 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2147067040] [2020-07-20 11:00:24,988 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 11:00:24,989 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:24,989 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 11:00:24,990 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-20 11:00:24,990 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 9 states. [2020-07-20 11:00:25,089 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:25,090 INFO L93 Difference]: Finished difference Result 37 states and 54 transitions. [2020-07-20 11:00:25,090 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 11:00:25,091 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2020-07-20 11:00:25,091 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:25,093 INFO L225 Difference]: With dead ends: 37 [2020-07-20 11:00:25,094 INFO L226 Difference]: Without dead ends: 33 [2020-07-20 11:00:25,094 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 44 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-20 11:00:25,095 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-20 11:00:25,104 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 26. [2020-07-20 11:00:25,104 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-20 11:00:25,105 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-20 11:00:25,106 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 27 [2020-07-20 11:00:25,106 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:25,106 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-20 11:00:25,107 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 11:00:25,107 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-20 11:00:25,108 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-20 11:00:25,109 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:25,109 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:25,322 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:25,323 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:25,324 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:25,325 INFO L82 PathProgramCache]: Analyzing trace with hash -2027372739, now seen corresponding path program 2 times [2020-07-20 11:00:25,325 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:25,326 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1265041696] [2020-07-20 11:00:25,326 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 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:25,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:25,360 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 11:00:25,363 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:25,430 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 21 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-20 11:00:25,430 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:25,731 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:25,732 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:25,789 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:25,790 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:25,839 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 26 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-20 11:00:25,840 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1265041696] [2020-07-20 11:00:25,841 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:25,841 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-20 11:00:25,841 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1628027743] [2020-07-20 11:00:25,842 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 11:00:25,843 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:25,843 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 11:00:25,844 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-20 11:00:25,844 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 11 states. [2020-07-20 11:00:26,052 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:26,053 INFO L93 Difference]: Finished difference Result 42 states and 68 transitions. [2020-07-20 11:00:26,053 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 11:00:26,053 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 39 [2020-07-20 11:00:26,054 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:26,055 INFO L225 Difference]: With dead ends: 42 [2020-07-20 11:00:26,056 INFO L226 Difference]: Without dead ends: 38 [2020-07-20 11:00:26,057 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 64 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-20 11:00:26,058 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-20 11:00:26,067 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 31. [2020-07-20 11:00:26,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-20 11:00:26,068 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-20 11:00:26,068 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 39 [2020-07-20 11:00:26,069 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:26,069 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-20 11:00:26,069 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 11:00:26,069 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-20 11:00:26,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-20 11:00:26,071 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:26,071 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:26,278 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:26,278 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:26,279 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:26,279 INFO L82 PathProgramCache]: Analyzing trace with hash -1111873851, now seen corresponding path program 2 times [2020-07-20 11:00:26,280 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:26,280 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [744374373] [2020-07-20 11:00:26,281 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:26,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:26,320 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 11:00:26,322 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:26,361 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 24 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-07-20 11:00:26,361 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:26,622 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:26,682 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:26,683 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:26,727 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 31 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-20 11:00:26,728 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [744374373] [2020-07-20 11:00:26,728 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:26,728 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-20 11:00:26,729 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1994421359] [2020-07-20 11:00:26,729 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 11:00:26,730 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:26,730 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 11:00:26,730 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-20 11:00:26,731 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 11 states. [2020-07-20 11:00:26,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:26,907 INFO L93 Difference]: Finished difference Result 47 states and 84 transitions. [2020-07-20 11:00:26,907 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 11:00:26,907 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 41 [2020-07-20 11:00:26,908 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:26,909 INFO L225 Difference]: With dead ends: 47 [2020-07-20 11:00:26,910 INFO L226 Difference]: Without dead ends: 43 [2020-07-20 11:00:26,910 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 68 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-20 11:00:26,911 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-07-20 11:00:26,925 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 31. [2020-07-20 11:00:26,925 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-20 11:00:26,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-20 11:00:26,927 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 41 [2020-07-20 11:00:26,927 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:26,928 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-20 11:00:26,928 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 11:00:26,928 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-20 11:00:26,932 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-07-20 11:00:26,933 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:26,933 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 5, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:27,147 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:27,148 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:27,148 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:27,148 INFO L82 PathProgramCache]: Analyzing trace with hash -767819153, now seen corresponding path program 3 times [2020-07-20 11:00:27,149 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:27,149 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [33377140] [2020-07-20 11:00:27,149 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:27,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:27,196 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 11:00:27,200 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:27,278 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 79 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-07-20 11:00:27,278 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:27,776 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:27,899 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:27,900 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:27,954 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:27,955 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:28,007 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 91 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2020-07-20 11:00:28,008 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [33377140] [2020-07-20 11:00:28,008 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:28,008 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-20 11:00:28,009 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1303215038] [2020-07-20 11:00:28,013 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 11:00:28,014 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:28,015 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 11:00:28,016 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-20 11:00:28,016 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 13 states. [2020-07-20 11:00:28,247 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:28,247 INFO L93 Difference]: Finished difference Result 52 states and 102 transitions. [2020-07-20 11:00:28,248 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 11:00:28,248 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 65 [2020-07-20 11:00:28,249 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:28,252 INFO L225 Difference]: With dead ends: 52 [2020-07-20 11:00:28,252 INFO L226 Difference]: Without dead ends: 48 [2020-07-20 11:00:28,253 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 111 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-20 11:00:28,255 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-20 11:00:28,268 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 36. [2020-07-20 11:00:28,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-20 11:00:28,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-20 11:00:28,270 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 65 [2020-07-20 11:00:28,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:28,271 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-20 11:00:28,271 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 11:00:28,271 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-20 11:00:28,273 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-07-20 11:00:28,273 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:28,274 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 11, 6, 6, 6, 6, 6, 6, 6, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:28,477 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:28,478 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:28,479 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:28,479 INFO L82 PathProgramCache]: Analyzing trace with hash 1474757101, now seen corresponding path program 3 times [2020-07-20 11:00:28,480 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:28,480 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1245581592] [2020-07-20 11:00:28,480 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:28,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:28,536 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 11:00:28,540 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:28,624 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 166 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2020-07-20 11:00:28,624 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:29,146 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:29,253 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:29,256 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:29,312 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:29,368 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 181 refuted. 0 times theorem prover too weak. 219 trivial. 0 not checked. [2020-07-20 11:00:29,369 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1245581592] [2020-07-20 11:00:29,369 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:29,369 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-20 11:00:29,370 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1240794133] [2020-07-20 11:00:29,372 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 11:00:29,373 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:29,373 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 11:00:29,375 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-20 11:00:29,379 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 13 states. [2020-07-20 11:00:29,550 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:29,551 INFO L93 Difference]: Finished difference Result 57 states and 122 transitions. [2020-07-20 11:00:29,552 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 11:00:29,552 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 96 [2020-07-20 11:00:29,553 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:29,555 INFO L225 Difference]: With dead ends: 57 [2020-07-20 11:00:29,555 INFO L226 Difference]: Without dead ends: 53 [2020-07-20 11:00:29,557 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 172 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-20 11:00:29,557 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-07-20 11:00:29,568 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 36. [2020-07-20 11:00:29,569 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-20 11:00:29,570 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-20 11:00:29,570 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 96 [2020-07-20 11:00:29,571 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:29,571 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-20 11:00:29,571 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 11:00:29,571 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-20 11:00:29,574 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-07-20 11:00:29,574 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:29,574 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 9, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:29,788 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:29,788 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:29,789 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:29,789 INFO L82 PathProgramCache]: Analyzing trace with hash 838335741, now seen corresponding path program 4 times [2020-07-20 11:00:29,790 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:29,790 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1397487470] [2020-07-20 11:00:29,790 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:29,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:29,860 INFO L263 TraceCheckSpWp]: Trace formula consists of 262 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 11:00:29,864 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:29,999 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 244 refuted. 0 times theorem prover too weak. 386 trivial. 0 not checked. [2020-07-20 11:00:30,000 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:30,665 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:30,666 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:30,875 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:30,977 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:31,042 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:31,091 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 266 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2020-07-20 11:00:31,092 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1397487470] [2020-07-20 11:00:31,092 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:31,093 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-20 11:00:31,093 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [727629197] [2020-07-20 11:00:31,094 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 11:00:31,094 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:31,094 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 11:00:31,095 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-20 11:00:31,095 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 15 states. [2020-07-20 11:00:31,469 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:31,469 INFO L93 Difference]: Finished difference Result 62 states and 144 transitions. [2020-07-20 11:00:31,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 11:00:31,470 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 117 [2020-07-20 11:00:31,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:31,473 INFO L225 Difference]: With dead ends: 62 [2020-07-20 11:00:31,474 INFO L226 Difference]: Without dead ends: 58 [2020-07-20 11:00:31,475 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 211 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2020-07-20 11:00:31,476 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-07-20 11:00:31,487 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 41. [2020-07-20 11:00:31,488 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-20 11:00:31,489 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-20 11:00:31,490 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 117 [2020-07-20 11:00:31,490 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:31,490 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-20 11:00:31,491 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 11:00:31,491 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-20 11:00:31,494 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2020-07-20 11:00:31,495 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:31,495 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 21, 13, 13, 13, 13, 13, 13, 13, 8, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:31,708 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:31,709 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:31,709 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:31,710 INFO L82 PathProgramCache]: Analyzing trace with hash -2072922826, now seen corresponding path program 4 times [2020-07-20 11:00:31,710 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:31,710 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1807339148] [2020-07-20 11:00:31,710 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:31,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:31,804 INFO L263 TraceCheckSpWp]: Trace formula consists of 423 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 11:00:31,809 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:31,902 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 86 proven. 506 refuted. 0 times theorem prover too weak. 1334 trivial. 0 not checked. [2020-07-20 11:00:31,903 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:32,721 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:32,957 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:33,053 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:33,055 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:33,124 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:33,125 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:33,195 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 86 proven. 532 refuted. 0 times theorem prover too weak. 1308 trivial. 0 not checked. [2020-07-20 11:00:33,195 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1807339148] [2020-07-20 11:00:33,196 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:33,196 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-20 11:00:33,196 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1458847740] [2020-07-20 11:00:33,197 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 11:00:33,197 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:33,197 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 11:00:33,198 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-20 11:00:33,198 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 15 states. [2020-07-20 11:00:33,409 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:33,410 INFO L93 Difference]: Finished difference Result 67 states and 168 transitions. [2020-07-20 11:00:33,410 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 11:00:33,410 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 190 [2020-07-20 11:00:33,411 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:33,414 INFO L225 Difference]: With dead ends: 67 [2020-07-20 11:00:33,414 INFO L226 Difference]: Without dead ends: 63 [2020-07-20 11:00:33,415 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 356 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2020-07-20 11:00:33,415 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-07-20 11:00:33,425 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 41. [2020-07-20 11:00:33,426 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-20 11:00:33,427 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-20 11:00:33,428 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 190 [2020-07-20 11:00:33,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:33,428 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-20 11:00:33,429 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 11:00:33,429 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-20 11:00:33,433 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 287 [2020-07-20 11:00:33,433 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:33,434 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 22, 21, 21, 21, 21, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:33,646 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:33,647 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:33,648 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:33,648 INFO L82 PathProgramCache]: Analyzing trace with hash -1082984306, now seen corresponding path program 5 times [2020-07-20 11:00:33,649 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:33,649 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [633182784] [2020-07-20 11:00:33,650 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:33,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:33,814 INFO L263 TraceCheckSpWp]: Trace formula consists of 639 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 11:00:33,820 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:33,918 INFO L134 CoverageAnalysis]: Checked inductivity of 4662 backedges. 159 proven. 967 refuted. 0 times theorem prover too weak. 3536 trivial. 0 not checked. [2020-07-20 11:00:33,919 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:35,269 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:35,640 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:35,812 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:35,900 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:35,951 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:35,953 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:36,086 INFO L134 CoverageAnalysis]: Checked inductivity of 4662 backedges. 159 proven. 1002 refuted. 0 times theorem prover too weak. 3501 trivial. 0 not checked. [2020-07-20 11:00:36,087 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [633182784] [2020-07-20 11:00:36,087 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:36,088 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-20 11:00:36,089 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1120381610] [2020-07-20 11:00:36,092 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 11:00:36,093 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:36,093 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 11:00:36,100 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-20 11:00:36,101 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 17 states. [2020-07-20 11:00:36,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:36,342 INFO L93 Difference]: Finished difference Result 72 states and 194 transitions. [2020-07-20 11:00:36,343 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 11:00:36,343 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 286 [2020-07-20 11:00:36,344 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:36,346 INFO L225 Difference]: With dead ends: 72 [2020-07-20 11:00:36,347 INFO L226 Difference]: Without dead ends: 68 [2020-07-20 11:00:36,348 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 578 GetRequests, 545 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2020-07-20 11:00:36,350 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-07-20 11:00:36,373 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 46. [2020-07-20 11:00:36,374 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-20 11:00:36,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-20 11:00:36,379 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 286 [2020-07-20 11:00:36,381 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:36,381 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-20 11:00:36,384 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 11:00:36,384 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-20 11:00:36,391 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 300 [2020-07-20 11:00:36,391 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:36,391 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 34, 21, 21, 21, 21, 21, 21, 21, 13, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:36,607 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:36,607 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:36,608 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:36,608 INFO L82 PathProgramCache]: Analyzing trace with hash 1006419304, now seen corresponding path program 5 times [2020-07-20 11:00:36,609 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:36,609 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [912297161] [2020-07-20 11:00:36,609 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:36,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:36,758 INFO L263 TraceCheckSpWp]: Trace formula consists of 665 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 11:00:36,763 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:36,893 INFO L134 CoverageAnalysis]: Checked inductivity of 5013 backedges. 159 proven. 1055 refuted. 0 times theorem prover too weak. 3799 trivial. 0 not checked. [2020-07-20 11:00:36,893 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:38,448 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:38,847 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:39,011 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:39,104 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:39,105 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:39,156 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:39,231 INFO L134 CoverageAnalysis]: Checked inductivity of 5013 backedges. 159 proven. 1095 refuted. 0 times theorem prover too weak. 3759 trivial. 0 not checked. [2020-07-20 11:00:39,232 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [912297161] [2020-07-20 11:00:39,232 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:39,232 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-20 11:00:39,233 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1189237779] [2020-07-20 11:00:39,233 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 11:00:39,234 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:39,234 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 11:00:39,234 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-20 11:00:39,235 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 17 states. [2020-07-20 11:00:39,497 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:39,497 INFO L93 Difference]: Finished difference Result 77 states and 222 transitions. [2020-07-20 11:00:39,498 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 11:00:39,498 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 299 [2020-07-20 11:00:39,499 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:39,507 INFO L225 Difference]: With dead ends: 77 [2020-07-20 11:00:39,508 INFO L226 Difference]: Without dead ends: 73 [2020-07-20 11:00:39,510 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 603 GetRequests, 570 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2020-07-20 11:00:39,511 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-07-20 11:00:39,545 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 46. [2020-07-20 11:00:39,546 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-20 11:00:39,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-20 11:00:39,552 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 299 [2020-07-20 11:00:39,554 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:39,555 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-20 11:00:39,555 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 11:00:39,555 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-20 11:00:39,571 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 508 [2020-07-20 11:00:39,571 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:39,572 INFO L422 BasicCegarLoop]: trace histogram [77, 77, 39, 38, 38, 38, 38, 38, 38, 38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:39,786 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:39,786 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:39,787 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:39,787 INFO L82 PathProgramCache]: Analyzing trace with hash 785285043, now seen corresponding path program 6 times [2020-07-20 11:00:39,788 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:39,788 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [270614549] [2020-07-20 11:00:39,789 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:40,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:40,028 INFO L263 TraceCheckSpWp]: Trace formula consists of 1132 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 11:00:40,038 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:40,284 INFO L134 CoverageAnalysis]: Checked inductivity of 15219 backedges. 391 proven. 2126 refuted. 0 times theorem prover too weak. 12702 trivial. 0 not checked. [2020-07-20 11:00:40,284 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:42,434 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:43,020 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:43,426 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:43,671 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:43,674 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:43,769 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:43,824 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:43,825 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:44,048 INFO L134 CoverageAnalysis]: Checked inductivity of 15219 backedges. 391 proven. 2177 refuted. 0 times theorem prover too weak. 12651 trivial. 0 not checked. [2020-07-20 11:00:44,048 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [270614549] [2020-07-20 11:00:44,048 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:44,049 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-20 11:00:44,049 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [152317897] [2020-07-20 11:00:44,050 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 11:00:44,050 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:44,050 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 11:00:44,051 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-20 11:00:44,051 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 19 states. [2020-07-20 11:00:44,609 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:44,609 INFO L93 Difference]: Finished difference Result 82 states and 252 transitions. [2020-07-20 11:00:44,610 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 11:00:44,610 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 507 [2020-07-20 11:00:44,611 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:44,615 INFO L225 Difference]: With dead ends: 82 [2020-07-20 11:00:44,615 INFO L226 Difference]: Without dead ends: 78 [2020-07-20 11:00:44,616 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1021 GetRequests, 983 SyntacticMatches, 14 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=211, Invalid=439, Unknown=0, NotChecked=0, Total=650 [2020-07-20 11:00:44,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-07-20 11:00:44,644 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 51. [2020-07-20 11:00:44,645 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-20 11:00:44,647 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 109 transitions. [2020-07-20 11:00:44,647 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 109 transitions. Word has length 507 [2020-07-20 11:00:44,651 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:44,651 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 109 transitions. [2020-07-20 11:00:44,651 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 11:00:44,652 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 109 transitions. [2020-07-20 11:00:44,657 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 451 [2020-07-20 11:00:44,657 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:44,657 INFO L422 BasicCegarLoop]: trace histogram [65, 65, 53, 32, 32, 32, 32, 32, 32, 32, 21, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:44,872 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:44,872 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:44,873 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:44,873 INFO L82 PathProgramCache]: Analyzing trace with hash -1350718391, now seen corresponding path program 6 times [2020-07-20 11:00:44,874 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:44,874 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1411419188] [2020-07-20 11:00:44,874 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:45,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:45,096 INFO L263 TraceCheckSpWp]: Trace formula consists of 1000 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 11:00:45,104 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:45,262 INFO L134 CoverageAnalysis]: Checked inductivity of 11682 backedges. 333 proven. 1918 refuted. 0 times theorem prover too weak. 9431 trivial. 0 not checked. [2020-07-20 11:00:45,263 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:47,232 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:47,937 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:47,938 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:48,331 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:48,332 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:48,504 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:48,612 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:48,613 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:48,664 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:48,782 INFO L134 CoverageAnalysis]: Checked inductivity of 11682 backedges. 333 proven. 1975 refuted. 0 times theorem prover too weak. 9374 trivial. 0 not checked. [2020-07-20 11:00:48,782 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1411419188] [2020-07-20 11:00:48,782 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:48,783 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-20 11:00:48,783 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1961477210] [2020-07-20 11:00:48,784 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 11:00:48,784 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:48,785 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 11:00:48,785 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-20 11:00:48,785 INFO L87 Difference]: Start difference. First operand 51 states and 109 transitions. Second operand 19 states. [2020-07-20 11:00:49,098 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:49,098 INFO L93 Difference]: Finished difference Result 87 states and 284 transitions. [2020-07-20 11:00:49,098 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 11:00:49,099 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 450 [2020-07-20 11:00:49,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:49,103 INFO L225 Difference]: With dead ends: 87 [2020-07-20 11:00:49,104 INFO L226 Difference]: Without dead ends: 83 [2020-07-20 11:00:49,105 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 906 GetRequests, 868 SyntacticMatches, 14 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=211, Invalid=439, Unknown=0, NotChecked=0, Total=650 [2020-07-20 11:00:49,105 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-07-20 11:00:49,116 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 51. [2020-07-20 11:00:49,117 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-20 11:00:49,118 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 109 transitions. [2020-07-20 11:00:49,119 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 109 transitions. Word has length 450 [2020-07-20 11:00:49,120 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:49,120 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 109 transitions. [2020-07-20 11:00:49,120 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 11:00:49,120 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 109 transitions. [2020-07-20 11:00:49,177 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1067 [2020-07-20 11:00:49,178 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:49,179 INFO L422 BasicCegarLoop]: trace histogram [163, 163, 82, 81, 81, 81, 81, 81, 81, 81, 81, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:49,390 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:49,391 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:49,392 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:49,392 INFO L82 PathProgramCache]: Analyzing trace with hash 40336450, now seen corresponding path program 7 times [2020-07-20 11:00:49,392 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:49,393 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1343232376] [2020-07-20 11:00:49,393 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:49,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:49,902 INFO L263 TraceCheckSpWp]: Trace formula consists of 2379 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 11:00:49,924 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:50,544 INFO L134 CoverageAnalysis]: Checked inductivity of 69012 backedges. 797 proven. 5632 refuted. 0 times theorem prover too weak. 62583 trivial. 0 not checked. [2020-07-20 11:00:50,545 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:54,750 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:54,751 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:56,221 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:56,871 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:56,873 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:57,279 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:57,280 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:57,457 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:57,458 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:57,567 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:57,568 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:57,638 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:58,181 INFO L134 CoverageAnalysis]: Checked inductivity of 69012 backedges. 797 proven. 5702 refuted. 0 times theorem prover too weak. 62513 trivial. 0 not checked. [2020-07-20 11:00:58,182 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1343232376] [2020-07-20 11:00:58,182 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:58,183 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-20 11:00:58,183 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [137295947] [2020-07-20 11:00:58,185 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 11:00:58,185 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:58,186 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 11:00:58,186 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-20 11:00:58,186 INFO L87 Difference]: Start difference. First operand 51 states and 109 transitions. Second operand 21 states. [2020-07-20 11:00:59,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:59,003 INFO L93 Difference]: Finished difference Result 92 states and 318 transitions. [2020-07-20 11:00:59,004 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 11:00:59,004 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1066 [2020-07-20 11:00:59,007 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:59,010 INFO L225 Difference]: With dead ends: 92 [2020-07-20 11:00:59,010 INFO L226 Difference]: Without dead ends: 88 [2020-07-20 11:00:59,011 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2140 GetRequests, 2097 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2020-07-20 11:00:59,012 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-07-20 11:00:59,024 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 56. [2020-07-20 11:00:59,025 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-20 11:00:59,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 130 transitions. [2020-07-20 11:00:59,027 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 130 transitions. Word has length 1066 [2020-07-20 11:00:59,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:59,028 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 130 transitions. [2020-07-20 11:00:59,029 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 11:00:59,029 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 130 transitions. [2020-07-20 11:00:59,035 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 657 [2020-07-20 11:00:59,035 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:59,036 INFO L422 BasicCegarLoop]: trace histogram [95, 95, 79, 47, 47, 47, 47, 47, 47, 47, 32, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:59,249 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:59,250 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:59,250 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:59,251 INFO L82 PathProgramCache]: Analyzing trace with hash -312379166, now seen corresponding path program 7 times [2020-07-20 11:00:59,251 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:59,252 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [267454749] [2020-07-20 11:00:59,252 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:59,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:59,568 INFO L263 TraceCheckSpWp]: Trace formula consists of 1457 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 11:00:59,580 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:59,901 INFO L134 CoverageAnalysis]: Checked inductivity of 25265 backedges. 501 proven. 3394 refuted. 0 times theorem prover too weak. 21370 trivial. 0 not checked. [2020-07-20 11:00:59,902 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:01:03,008 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:03,009 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:04,027 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:04,540 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:04,541 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:04,853 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:04,854 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:05,070 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:05,182 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:05,255 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:05,756 INFO L134 CoverageAnalysis]: Checked inductivity of 25265 backedges. 501 proven. 3471 refuted. 0 times theorem prover too weak. 21293 trivial. 0 not checked. [2020-07-20 11:01:05,757 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [267454749] [2020-07-20 11:01:05,757 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:01:05,758 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-20 11:01:05,789 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1243939222] [2020-07-20 11:01:05,791 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 11:01:05,792 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:01:05,793 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 11:01:05,794 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-20 11:01:05,794 INFO L87 Difference]: Start difference. First operand 56 states and 130 transitions. Second operand 21 states. [2020-07-20 11:01:06,504 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:01:06,505 INFO L93 Difference]: Finished difference Result 97 states and 354 transitions. [2020-07-20 11:01:06,505 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 11:01:06,506 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 656 [2020-07-20 11:01:06,507 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:01:06,511 INFO L225 Difference]: With dead ends: 97 [2020-07-20 11:01:06,512 INFO L226 Difference]: Without dead ends: 93 [2020-07-20 11:01:06,513 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1319 GetRequests, 1276 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2020-07-20 11:01:06,514 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-07-20 11:01:06,532 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 56. [2020-07-20 11:01:06,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-20 11:01:06,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 130 transitions. [2020-07-20 11:01:06,534 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 130 transitions. Word has length 656 [2020-07-20 11:01:06,535 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:01:06,535 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 130 transitions. [2020-07-20 11:01:06,536 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 11:01:06,536 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 130 transitions. [2020-07-20 11:01:06,553 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1275 [2020-07-20 11:01:06,554 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:01:06,554 INFO L422 BasicCegarLoop]: trace histogram [195, 195, 98, 97, 97, 97, 97, 97, 97, 97, 97, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:01:06,767 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:01:06,768 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:01:06,768 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:01:06,769 INFO L82 PathProgramCache]: Analyzing trace with hash 971855614, now seen corresponding path program 8 times [2020-07-20 11:01:06,770 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:01:06,770 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [509708586] [2020-07-20 11:01:06,770 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:01:07,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:01:07,319 INFO L263 TraceCheckSpWp]: Trace formula consists of 2843 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 11:01:07,340 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:01:08,165 INFO L134 CoverageAnalysis]: Checked inductivity of 98940 backedges. 1168 proven. 7570 refuted. 0 times theorem prover too weak. 90202 trivial. 0 not checked. [2020-07-20 11:01:08,165 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:01:13,322 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:15,644 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:16,626 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:17,235 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:17,236 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:17,603 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:17,605 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:17,839 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:17,940 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:17,940 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:17,995 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:17,996 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:18,707 INFO L134 CoverageAnalysis]: Checked inductivity of 98940 backedges. 1168 proven. 7662 refuted. 0 times theorem prover too weak. 90110 trivial. 0 not checked. [2020-07-20 11:01:18,708 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [509708586] [2020-07-20 11:01:18,708 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:01:18,708 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-20 11:01:18,709 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [102844255] [2020-07-20 11:01:18,710 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 11:01:18,710 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:01:18,711 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 11:01:18,711 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-20 11:01:18,712 INFO L87 Difference]: Start difference. First operand 56 states and 130 transitions. Second operand 23 states. [2020-07-20 11:01:19,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:01:19,693 INFO L93 Difference]: Finished difference Result 102 states and 392 transitions. [2020-07-20 11:01:19,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 11:01:19,694 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1274 [2020-07-20 11:01:19,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:01:19,702 INFO L225 Difference]: With dead ends: 102 [2020-07-20 11:01:19,702 INFO L226 Difference]: Without dead ends: 98 [2020-07-20 11:01:19,705 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2557 GetRequests, 2509 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2020-07-20 11:01:19,705 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-07-20 11:01:19,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 61. [2020-07-20 11:01:19,724 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-20 11:01:19,725 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 153 transitions. [2020-07-20 11:01:19,725 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 153 transitions. Word has length 1274 [2020-07-20 11:01:19,727 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:01:19,727 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 153 transitions. [2020-07-20 11:01:19,727 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 11:01:19,728 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 153 transitions. [2020-07-20 11:01:19,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1821 [2020-07-20 11:01:19,765 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:01:19,765 INFO L422 BasicCegarLoop]: trace histogram [267, 267, 211, 133, 133, 133, 133, 133, 133, 133, 78, 56, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:01:19,978 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:01:19,979 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:01:19,980 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:01:19,981 INFO L82 PathProgramCache]: Analyzing trace with hash 1926911020, now seen corresponding path program 8 times [2020-07-20 11:01:19,981 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:01:19,982 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1187183247] [2020-07-20 11:01:19,982 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:01:20,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:01:20,747 INFO L263 TraceCheckSpWp]: Trace formula consists of 4043 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 11:01:20,767 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:01:22,177 INFO L134 CoverageAnalysis]: Checked inductivity of 199311 backedges. 1523 proven. 11417 refuted. 0 times theorem prover too weak. 186371 trivial. 0 not checked. [2020-07-20 11:01:22,177 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:01:29,573 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:31,900 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:31,901 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:33,287 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:33,288 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:33,964 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:34,392 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:34,393 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:34,643 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:34,751 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:34,808 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:36,189 INFO L134 CoverageAnalysis]: Checked inductivity of 199311 backedges. 1523 proven. 11517 refuted. 0 times theorem prover too weak. 186271 trivial. 0 not checked. [2020-07-20 11:01:36,190 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1187183247] [2020-07-20 11:01:36,190 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:01:36,191 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-20 11:01:36,191 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [725795768] [2020-07-20 11:01:36,193 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 11:01:36,194 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:01:36,194 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 11:01:36,195 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-20 11:01:36,195 INFO L87 Difference]: Start difference. First operand 61 states and 153 transitions. Second operand 23 states. [2020-07-20 11:01:37,120 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:01:37,121 INFO L93 Difference]: Finished difference Result 107 states and 432 transitions. [2020-07-20 11:01:37,122 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 11:01:37,122 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1820 [2020-07-20 11:01:37,125 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:01:37,129 INFO L225 Difference]: With dead ends: 107 [2020-07-20 11:01:37,130 INFO L226 Difference]: Without dead ends: 103 [2020-07-20 11:01:37,131 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3648 GetRequests, 3600 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2020-07-20 11:01:37,131 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2020-07-20 11:01:37,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 61. [2020-07-20 11:01:37,146 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-20 11:01:37,148 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 153 transitions. [2020-07-20 11:01:37,148 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 153 transitions. Word has length 1820 [2020-07-20 11:01:37,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:01:37,150 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 153 transitions. [2020-07-20 11:01:37,150 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 11:01:37,151 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 153 transitions. [2020-07-20 11:01:37,187 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2029 [2020-07-20 11:01:37,187 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:01:37,188 INFO L422 BasicCegarLoop]: trace histogram [311, 311, 156, 155, 155, 155, 155, 155, 155, 155, 155, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:01:37,401 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:01:37,401 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:01:37,402 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:01:37,403 INFO L82 PathProgramCache]: Analyzing trace with hash -2013442466, now seen corresponding path program 9 times [2020-07-20 11:01:37,403 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:01:37,404 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [860421333] [2020-07-20 11:01:37,404 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:01:38,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:01:38,266 INFO L263 TraceCheckSpWp]: Trace formula consists of 4525 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 11:01:38,290 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:01:40,306 INFO L134 CoverageAnalysis]: Checked inductivity of 252495 backedges. 2059 proven. 13739 refuted. 0 times theorem prover too weak. 236697 trivial. 0 not checked. [2020-07-20 11:01:40,306 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:01:47,843 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:51,307 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:53,392 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:54,280 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:54,280 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:54,872 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:54,873 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:55,182 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:55,183 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:55,395 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:55,507 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:55,568 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:56,997 INFO L134 CoverageAnalysis]: Checked inductivity of 252495 backedges. 2059 proven. 13856 refuted. 0 times theorem prover too weak. 236580 trivial. 0 not checked. [2020-07-20 11:01:56,997 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [860421333] [2020-07-20 11:01:56,997 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:01:56,998 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 25 [2020-07-20 11:01:56,998 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [798595918] [2020-07-20 11:01:56,999 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 11:01:56,999 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:01:57,000 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 11:01:57,001 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2020-07-20 11:01:57,002 INFO L87 Difference]: Start difference. First operand 61 states and 153 transitions. Second operand 25 states. [2020-07-20 11:01:58,020 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:01:58,021 INFO L93 Difference]: Finished difference Result 112 states and 474 transitions. [2020-07-20 11:01:58,022 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 11:01:58,022 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 2028 [2020-07-20 11:01:58,025 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:01:58,029 INFO L225 Difference]: With dead ends: 112 [2020-07-20 11:01:58,029 INFO L226 Difference]: Without dead ends: 108 [2020-07-20 11:01:58,030 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4066 GetRequests, 4013 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 11:01:58,031 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-07-20 11:01:58,045 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 66. [2020-07-20 11:01:58,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-07-20 11:01:58,046 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 178 transitions. [2020-07-20 11:01:58,046 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 178 transitions. Word has length 2028 [2020-07-20 11:01:58,048 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:01:58,048 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 178 transitions. [2020-07-20 11:01:58,048 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 11:01:58,048 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 178 transitions. [2020-07-20 11:01:58,106 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3145 [2020-07-20 11:01:58,106 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:01:58,107 INFO L422 BasicCegarLoop]: trace histogram [461, 461, 371, 230, 230, 230, 230, 230, 230, 230, 141, 90, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:01:58,314 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:01:58,314 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:01:58,314 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:01:58,316 INFO L82 PathProgramCache]: Analyzing trace with hash -1076189233, now seen corresponding path program 9 times [2020-07-20 11:01:58,316 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:01:58,316 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [818603279] [2020-07-20 11:01:58,317 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:01:59,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:01:59,453 INFO L263 TraceCheckSpWp]: Trace formula consists of 6982 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 11:01:59,482 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:02:03,427 INFO L134 CoverageAnalysis]: Checked inductivity of 598095 backedges. 3029 proven. 22265 refuted. 0 times theorem prover too weak. 572801 trivial. 0 not checked. [2020-07-20 11:02:03,428 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:02:12,570 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:17,910 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:20,695 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:20,696 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:21,917 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:22,512 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:22,914 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:23,100 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:23,199 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:23,199 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:23,258 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:23,259 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:26,518 INFO L134 CoverageAnalysis]: Checked inductivity of 598095 backedges. 3029 proven. 22391 refuted. 0 times theorem prover too weak. 572675 trivial. 0 not checked. [2020-07-20 11:02:26,518 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [818603279] [2020-07-20 11:02:26,518 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:02:26,524 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 25 [2020-07-20 11:02:26,525 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1204282248] [2020-07-20 11:02:26,527 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 11:02:26,527 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:02:26,528 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 11:02:26,528 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2020-07-20 11:02:26,528 INFO L87 Difference]: Start difference. First operand 66 states and 178 transitions. Second operand 25 states. [2020-07-20 11:02:27,339 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:02:27,339 INFO L93 Difference]: Finished difference Result 117 states and 518 transitions. [2020-07-20 11:02:27,340 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 11:02:27,341 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 3144 [2020-07-20 11:02:27,344 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:02:27,349 INFO L225 Difference]: With dead ends: 117 [2020-07-20 11:02:27,349 INFO L226 Difference]: Without dead ends: 113 [2020-07-20 11:02:27,350 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6297 GetRequests, 6244 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 11:02:27,351 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2020-07-20 11:02:27,367 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 66. [2020-07-20 11:02:27,367 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-07-20 11:02:27,369 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 178 transitions. [2020-07-20 11:02:27,369 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 178 transitions. Word has length 3144 [2020-07-20 11:02:27,371 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:02:27,371 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 178 transitions. [2020-07-20 11:02:27,372 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 11:02:27,372 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 178 transitions. [2020-07-20 11:02:27,483 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4434 [2020-07-20 11:02:27,483 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:02:27,484 INFO L422 BasicCegarLoop]: trace histogram [681, 681, 341, 340, 340, 340, 340, 340, 340, 340, 340, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:02:27,685 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:02:27,685 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:02:27,686 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:02:27,687 INFO L82 PathProgramCache]: Analyzing trace with hash 1507680547, now seen corresponding path program 10 times [2020-07-20 11:02:27,688 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:02:27,688 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1405548251] [2020-07-20 11:02:27,688 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:02:29,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:02:29,236 INFO L263 TraceCheckSpWp]: Trace formula consists of 9890 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-20 11:02:29,269 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:02:35,684 INFO L134 CoverageAnalysis]: Checked inductivity of 1214310 backedges. 4455 proven. 34400 refuted. 0 times theorem prover too weak. 1175455 trivial. 0 not checked. [2020-07-20 11:02:35,684 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:02:51,877 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:51,878 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:59,554 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:02,996 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:04,789 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:06,489 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:07,116 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:07,117 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:07,528 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:07,716 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:07,822 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:07,881 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:13,976 INFO L134 CoverageAnalysis]: Checked inductivity of 1214310 backedges. 4455 proven. 34545 refuted. 0 times theorem prover too weak. 1175310 trivial. 0 not checked. [2020-07-20 11:03:13,977 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1405548251] [2020-07-20 11:03:13,977 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:03:13,978 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 27 [2020-07-20 11:03:13,978 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2131190842] [2020-07-20 11:03:13,981 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-20 11:03:13,981 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:03:13,981 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-20 11:03:13,982 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2020-07-20 11:03:13,982 INFO L87 Difference]: Start difference. First operand 66 states and 178 transitions. Second operand 27 states. [2020-07-20 11:03:15,164 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:03:15,164 INFO L93 Difference]: Finished difference Result 122 states and 564 transitions. [2020-07-20 11:03:15,166 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 11:03:15,166 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 4433 [2020-07-20 11:03:15,172 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:03:15,177 INFO L225 Difference]: With dead ends: 122 [2020-07-20 11:03:15,177 INFO L226 Difference]: Without dead ends: 118 [2020-07-20 11:03:15,178 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8877 GetRequests, 8819 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406 [2020-07-20 11:03:15,179 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-07-20 11:03:15,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 71. [2020-07-20 11:03:15,209 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-20 11:03:15,210 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 205 transitions. [2020-07-20 11:03:15,211 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 205 transitions. Word has length 4433 [2020-07-20 11:03:15,216 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:03:15,217 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 205 transitions. [2020-07-20 11:03:15,217 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-20 11:03:15,217 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 205 transitions. [2020-07-20 11:03:15,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8141 [2020-07-20 11:03:15,726 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:03:15,729 INFO L422 BasicCegarLoop]: trace histogram [1199, 1199, 939, 599, 599, 599, 599, 599, 599, 599, 340, 260, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:03:15,936 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:03:15,937 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:03:15,937 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:03:15,940 INFO L82 PathProgramCache]: Analyzing trace with hash 1642038220, now seen corresponding path program 10 times [2020-07-20 11:03:15,940 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:03:15,940 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [82389416] [2020-07-20 11:03:15,941 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:03:18,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:03:18,733 INFO L263 TraceCheckSpWp]: Trace formula consists of 18081 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-20 11:03:18,798 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:03:38,606 INFO L134 CoverageAnalysis]: Checked inductivity of 4029599 backedges. 7276 proven. 65941 refuted. 0 times theorem prover too weak. 3956382 trivial. 0 not checked. [2020-07-20 11:03:38,607 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:04:13,153 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:27,170 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:27,171 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:32,921 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:32,922 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:36,108 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:36,109 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:38,832 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:38,833 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:40,154 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:40,155 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:40,821 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:41,151 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:41,152 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:41,293 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:41,294 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:41,382 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:03,502 INFO L134 CoverageAnalysis]: Checked inductivity of 4029599 backedges. 7276 proven. 66096 refuted. 0 times theorem prover too weak. 3956227 trivial. 0 not checked. [2020-07-20 11:05:03,502 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [82389416] [2020-07-20 11:05:03,503 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:05:03,504 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 27 [2020-07-20 11:05:03,504 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [408667003] [2020-07-20 11:05:03,509 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-20 11:05:03,509 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:05:03,510 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-20 11:05:03,510 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2020-07-20 11:05:03,510 INFO L87 Difference]: Start difference. First operand 71 states and 205 transitions. Second operand 27 states. [2020-07-20 11:05:05,033 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:05:05,033 INFO L93 Difference]: Finished difference Result 127 states and 612 transitions. [2020-07-20 11:05:05,037 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 11:05:05,037 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 8140 [2020-07-20 11:05:05,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:05:05,050 INFO L225 Difference]: With dead ends: 127 [2020-07-20 11:05:05,050 INFO L226 Difference]: Without dead ends: 123 [2020-07-20 11:05:05,051 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16290 GetRequests, 16232 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406 [2020-07-20 11:05:05,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2020-07-20 11:05:05,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 71. [2020-07-20 11:05:05,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-20 11:05:05,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 205 transitions. [2020-07-20 11:05:05,075 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 205 transitions. Word has length 8140 [2020-07-20 11:05:05,081 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:05:05,081 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 205 transitions. [2020-07-20 11:05:05,082 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-20 11:05:05,082 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 205 transitions. [2020-07-20 11:05:05,996 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11129 [2020-07-20 11:05:05,996 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:05:06,000 INFO L422 BasicCegarLoop]: trace histogram [1711, 1711, 856, 855, 855, 855, 855, 855, 855, 855, 855, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:05:06,200 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:05:06,201 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:05:06,201 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:05:06,203 INFO L82 PathProgramCache]: Analyzing trace with hash -434172532, now seen corresponding path program 11 times [2020-07-20 11:05:06,204 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:05:06,209 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1643908203] [2020-07-20 11:05:06,210 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:05:10,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:05:10,108 INFO L263 TraceCheckSpWp]: Trace formula consists of 24825 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-20 11:05:10,184 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:05:45,365 INFO L134 CoverageAnalysis]: Checked inductivity of 7677045 backedges. 10309 proven. 97572 refuted. 0 times theorem prover too weak. 7569164 trivial. 0 not checked. [2020-07-20 11:05:45,366 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:06:51,130 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:14,193 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:23,236 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:23,237 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:31,274 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 11:07:31,496 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:31,497 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:34,192 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:36,743 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:36,744 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:38,035 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:38,037 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:38,960 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:39,489 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:39,490 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:39,731 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:39,868 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:21,120 INFO L134 CoverageAnalysis]: Checked inductivity of 7677045 backedges. 10309 proven. 97748 refuted. 0 times theorem prover too weak. 7568988 trivial. 0 not checked. [2020-07-20 11:08:21,120 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1643908203] [2020-07-20 11:08:21,120 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:08:21,123 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 27] total 29 [2020-07-20 11:08:21,123 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1305152374] [2020-07-20 11:08:21,131 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-20 11:08:21,132 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:08:21,132 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-20 11:08:21,133 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2020-07-20 11:08:21,133 INFO L87 Difference]: Start difference. First operand 71 states and 205 transitions. Second operand 29 states. [2020-07-20 11:08:23,717 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:08:23,717 INFO L93 Difference]: Finished difference Result 132 states and 662 transitions. [2020-07-20 11:08:23,720 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-20 11:08:23,721 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 11128 [2020-07-20 11:08:23,729 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:08:23,736 INFO L225 Difference]: With dead ends: 132 [2020-07-20 11:08:23,736 INFO L226 Difference]: Without dead ends: 128 [2020-07-20 11:08:23,738 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22268 GetRequests, 22205 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640 [2020-07-20 11:08:23,739 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2020-07-20 11:08:23,765 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 76. [2020-07-20 11:08:23,765 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-20 11:08:23,767 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 234 transitions. [2020-07-20 11:08:23,768 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 234 transitions. Word has length 11128 [2020-07-20 11:08:23,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:08:23,774 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 234 transitions. [2020-07-20 11:08:23,774 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-20 11:08:23,774 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 234 transitions. [2020-07-20 11:08:24,446 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10529 [2020-07-20 11:08:24,446 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:08:24,450 INFO L422 BasicCegarLoop]: trace histogram [1545, 1545, 1251, 772, 772, 772, 772, 772, 772, 772, 479, 294, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:08:24,650 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:08:24,651 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:08:24,652 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:08:24,656 INFO L82 PathProgramCache]: Analyzing trace with hash -1814511095, now seen corresponding path program 11 times [2020-07-20 11:08:24,656 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:08:24,656 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [791566820] [2020-07-20 11:08:24,657 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:08:28,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:08:28,629 INFO L263 TraceCheckSpWp]: Trace formula consists of 23376 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-20 11:08:28,713 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:09:01,025 INFO L134 CoverageAnalysis]: Checked inductivity of 6743259 backedges. 9670 proven. 94167 refuted. 0 times theorem prover too weak. 6639422 trivial. 0 not checked. [2020-07-20 11:09:01,026 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:09:52,220 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 11:09:52,327 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 11:09:52,433 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 78 [2020-07-20 11:09:53,323 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:09:53,323 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:10:23,937 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:10:41,833 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 11:10:41,939 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 11:10:42,052 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 11:10:42,159 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 11:10:42,366 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 11:10:42,963 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:10:42,964 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:10:54,030 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:10:54,031 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:10:58,432 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:10:58,432 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:11:01,698 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-20 11:11:01,950 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:11:01,951 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:11:03,555 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:11:04,654 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:11:05,168 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:11:05,169 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:11:05,477 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:11:05,478 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:11:05,655 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:11:42,591 INFO L134 CoverageAnalysis]: Checked inductivity of 6743259 backedges. 9670 proven. 94354 refuted. 0 times theorem prover too weak. 6639235 trivial. 0 not checked. [2020-07-20 11:11:42,591 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [791566820] [2020-07-20 11:11:42,592 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:11:42,594 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 27] total 29 [2020-07-20 11:11:42,594 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1104669824] [2020-07-20 11:11:42,598 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-20 11:11:42,599 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:11:42,599 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-20 11:11:42,600 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2020-07-20 11:11:42,600 INFO L87 Difference]: Start difference. First operand 76 states and 234 transitions. Second operand 29 states. [2020-07-20 11:11:45,493 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:11:45,494 INFO L93 Difference]: Finished difference Result 137 states and 714 transitions. [2020-07-20 11:11:45,500 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-20 11:11:45,500 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 10528 [2020-07-20 11:11:45,506 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:11:45,510 INFO L225 Difference]: With dead ends: 137 [2020-07-20 11:11:45,511 INFO L226 Difference]: Without dead ends: 133 [2020-07-20 11:11:45,513 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21067 GetRequests, 21004 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640 [2020-07-20 11:11:45,514 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2020-07-20 11:11:45,543 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 76. [2020-07-20 11:11:45,543 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-20 11:11:45,546 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 234 transitions. [2020-07-20 11:11:45,546 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 234 transitions. Word has length 10528 [2020-07-20 11:11:45,552 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:11:45,552 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 234 transitions. [2020-07-20 11:11:45,553 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-20 11:11:45,553 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 234 transitions. [2020-07-20 11:11:45,921 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7411 [2020-07-20 11:11:45,921 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:11:45,924 INFO L422 BasicCegarLoop]: trace histogram [1139, 1139, 570, 569, 569, 569, 569, 569, 569, 569, 569, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:11:46,127 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:11:46,131 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:11:46,131 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:11:46,133 INFO L82 PathProgramCache]: Analyzing trace with hash 796342460, now seen corresponding path program 12 times [2020-07-20 11:11:46,133 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:11:46,133 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1595621624] [2020-07-20 11:11:46,134 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:11:49,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:11:49,258 INFO L263 TraceCheckSpWp]: Trace formula consists of 16531 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-20 11:11:49,329 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:12:09,416 INFO L134 CoverageAnalysis]: Checked inductivity of 3400344 backedges. 8695 proven. 68993 refuted. 0 times theorem prover too weak. 3322656 trivial. 0 not checked. [2020-07-20 11:12:09,417 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:12:12,018 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 11:12:12,122 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 11:12:13,135 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 11:12:13,241 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 11:12:13,359 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 11:12:13,473 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 11:12:14,579 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 11:12:14,703 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 11:12:14,839 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 11:12:14,979 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 11:12:17,053 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 11:12:17,195 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 11:12:17,349 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 11:12:17,496 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 11:12:20,625 WARN L193 SmtUtils]: Spent 152.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 11:12:20,784 WARN L193 SmtUtils]: Spent 157.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 11:12:20,948 WARN L193 SmtUtils]: Spent 159.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 11:12:21,112 WARN L193 SmtUtils]: Spent 162.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 11:12:25,173 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-20 11:12:25,313 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-20 11:12:25,454 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-20 11:12:25,594 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-20 11:12:25,734 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 91 [2020-07-20 11:12:25,867 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 88 [2020-07-20 11:12:25,991 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 84 [2020-07-20 11:12:26,111 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 81 [2020-07-20 11:12:26,225 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2020-07-20 11:12:26,331 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 73 [2020-07-20 11:13:03,444 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 11:13:03,547 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 11:13:03,658 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 11:13:03,767 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 11:13:05,510 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 11:13:05,620 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 11:13:05,743 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 11:13:05,864 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 11:13:08,492 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 11:13:08,620 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 11:13:08,754 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 11:13:08,884 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 11:13:09,016 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 85 [2020-07-20 11:13:09,138 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 82 [2020-07-20 11:13:09,252 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 79 [2020-07-20 11:13:09,361 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 75 [2020-07-20 11:13:09,463 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2020-07-20 11:13:10,256 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:13:32,637 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 11:13:32,740 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 11:13:32,854 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 11:13:32,964 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 11:13:34,798 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 11:13:34,912 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 11:13:35,034 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 11:13:35,146 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 11:13:35,261 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 78 [2020-07-20 11:13:35,463 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2020-07-20 11:13:36,189 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:13:36,189 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts