/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf -i ../../../trunk/examples/svcomp/loops/sum01-1.i -------------------------------------------------------------------------------- This is Ultimate 0.2.0-b8ad66e [2020-10-23 21:46:04,507 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-23 21:46:04,512 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-23 21:46:04,553 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-10-23 21:46:04,568 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-23 21:46:04,569 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-23 21:46:04,571 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-23 21:46:04,572 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-23 21:46:04,574 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-23 21:46:04,575 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-23 21:46:04,577 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-23 21:46:04,596 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-23 21:46:04,598 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-23 21:46:04,600 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-23 21:46:04,602 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-23 21:46:04,603 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-23 21:46:04,607 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-10-23 21:46:04,617 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-10-23 21:46:04,618 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-10-23 21:46:04,619 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-10-23 21:46:04,620 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf [2020-10-23 21:46:04,632 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-23 21:46:04,632 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-23 21:46:04,634 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-23 21:46:04,634 INFO L138 SettingsManager]: * sizeof long=4 [2020-10-23 21:46:04,634 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-23 21:46:04,634 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-10-23 21:46:04,635 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-23 21:46:04,635 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-10-23 21:46:04,635 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-10-23 21:46:04,635 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-10-23 21:46:04,635 INFO L138 SettingsManager]: * sizeof long double=12 [2020-10-23 21:46:04,636 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-23 21:46:04,636 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-23 21:46:04,636 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-10-23 21:46:04,636 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-23 21:46:04,637 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-10-23 21:46:04,637 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-10-23 21:46:04,637 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-10-23 21:46:04,637 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-23 21:46:04,637 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-23 21:46:04,638 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-10-23 21:46:04,638 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-10-23 21:46:04,638 INFO L138 SettingsManager]: * Use separate solver for trace checks=false WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-10-23 21:46:05,044 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-23 21:46:05,082 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-23 21:46:05,086 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-23 21:46:05,088 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-23 21:46:05,089 INFO L275 PluginConnector]: CDTParser initialized [2020-10-23 21:46:05,090 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/sum01-1.i [2020-10-23 21:46:05,191 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d912cafdc/d431be729dde4fad80746211a4e9fe40/FLAG95117a188 [2020-10-23 21:46:05,768 INFO L306 CDTParser]: Found 1 translation units. [2020-10-23 21:46:05,768 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/sum01-1.i [2020-10-23 21:46:05,777 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d912cafdc/d431be729dde4fad80746211a4e9fe40/FLAG95117a188 [2020-10-23 21:46:06,155 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d912cafdc/d431be729dde4fad80746211a4e9fe40 [2020-10-23 21:46:06,158 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-23 21:46:06,165 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-10-23 21:46:06,167 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-23 21:46:06,168 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-23 21:46:06,172 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-23 21:46:06,173 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.10 09:46:06" (1/1) ... [2020-10-23 21:46:06,182 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5b7411b6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:46:06, skipping insertion in model container [2020-10-23 21:46:06,182 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.10 09:46:06" (1/1) ... [2020-10-23 21:46:06,192 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-23 21:46:06,209 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-23 21:46:06,383 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-23 21:46:06,394 INFO L203 MainTranslator]: Completed pre-run [2020-10-23 21:46:06,412 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-23 21:46:06,429 INFO L208 MainTranslator]: Completed translation [2020-10-23 21:46:06,430 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:46:06 WrapperNode [2020-10-23 21:46:06,430 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-23 21:46:06,431 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-23 21:46:06,431 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-23 21:46:06,431 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-23 21:46:06,444 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:46:06" (1/1) ... [2020-10-23 21:46:06,444 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:46:06" (1/1) ... [2020-10-23 21:46:06,452 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:46:06" (1/1) ... [2020-10-23 21:46:06,452 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:46:06" (1/1) ... [2020-10-23 21:46:06,457 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:46:06" (1/1) ... [2020-10-23 21:46:06,462 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:46:06" (1/1) ... [2020-10-23 21:46:06,463 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:46:06" (1/1) ... [2020-10-23 21:46:06,465 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-23 21:46:06,466 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-23 21:46:06,467 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-23 21:46:06,467 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-23 21:46:06,468 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:46:06" (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 [2020-10-23 21:46:06,550 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-10-23 21:46:06,550 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-23 21:46:06,551 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2020-10-23 21:46:06,551 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-10-23 21:46:06,551 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-10-23 21:46:06,551 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-10-23 21:46:06,551 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2020-10-23 21:46:06,552 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2020-10-23 21:46:06,552 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2020-10-23 21:46:06,552 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2020-10-23 21:46:06,552 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-10-23 21:46:06,552 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-10-23 21:46:06,552 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-10-23 21:46:06,553 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-10-23 21:46:06,553 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-10-23 21:46:06,553 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-10-23 21:46:06,553 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-23 21:46:06,553 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-10-23 21:46:06,554 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-10-23 21:46:06,554 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-10-23 21:46:06,838 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-23 21:46:06,838 INFO L298 CfgBuilder]: Removed 1 assume(true) statements. [2020-10-23 21:46:06,840 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.10 09:46:06 BoogieIcfgContainer [2020-10-23 21:46:06,840 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-23 21:46:06,843 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-10-23 21:46:06,843 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-10-23 21:46:06,847 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-10-23 21:46:06,847 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.10 09:46:06" (1/3) ... [2020-10-23 21:46:06,849 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@592b91c0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.10 09:46:06, skipping insertion in model container [2020-10-23 21:46:06,849 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:46:06" (2/3) ... [2020-10-23 21:46:06,849 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@592b91c0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.10 09:46:06, skipping insertion in model container [2020-10-23 21:46:06,849 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.10 09:46:06" (3/3) ... [2020-10-23 21:46:06,851 INFO L111 eAbstractionObserver]: Analyzing ICFG sum01-1.i [2020-10-23 21:46:06,881 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-10-23 21:46:06,889 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-10-23 21:46:06,922 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-10-23 21:46:06,982 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-10-23 21:46:06,983 INFO L378 AbstractCegarLoop]: Hoare is true [2020-10-23 21:46:06,983 INFO L379 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2020-10-23 21:46:06,983 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-23 21:46:06,983 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-23 21:46:06,984 INFO L382 AbstractCegarLoop]: Difference is false [2020-10-23 21:46:06,984 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-23 21:46:06,984 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-10-23 21:46:07,006 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states. [2020-10-23 21:46:07,015 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-10-23 21:46:07,016 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 21:46:07,017 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 21:46:07,017 INFO L429 AbstractCegarLoop]: === Iteration 1 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 21:46:07,024 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 21:46:07,024 INFO L82 PathProgramCache]: Analyzing trace with hash 1475454684, now seen corresponding path program 1 times [2020-10-23 21:46:07,035 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 21:46:07,035 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1047129561] [2020-10-23 21:46:07,036 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 21:46:07,117 INFO L321 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-10-23 21:46:07,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:46:07,377 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 21:46:07,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:46:07,401 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 21:46:07,403 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1047129561] [2020-10-23 21:46:07,405 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 21:46:07,405 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-10-23 21:46:07,406 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1786674302] [2020-10-23 21:46:07,410 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-10-23 21:46:07,411 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 21:46:07,425 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-10-23 21:46:07,425 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-10-23 21:46:07,428 INFO L87 Difference]: Start difference. First operand 39 states. Second operand 3 states. [2020-10-23 21:46:07,528 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 21:46:07,529 INFO L93 Difference]: Finished difference Result 52 states and 59 transitions. [2020-10-23 21:46:07,530 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-10-23 21:46:07,531 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-10-23 21:46:07,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 21:46:07,540 INFO L225 Difference]: With dead ends: 52 [2020-10-23 21:46:07,540 INFO L226 Difference]: Without dead ends: 29 [2020-10-23 21:46:07,544 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-10-23 21:46:07,563 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-10-23 21:46:07,588 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-10-23 21:46:07,590 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-10-23 21:46:07,591 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2020-10-23 21:46:07,593 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 23 [2020-10-23 21:46:07,593 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 21:46:07,593 INFO L481 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2020-10-23 21:46:07,594 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-10-23 21:46:07,594 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2020-10-23 21:46:07,595 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-10-23 21:46:07,595 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 21:46:07,595 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 21:46:07,595 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-10-23 21:46:07,596 INFO L429 AbstractCegarLoop]: === Iteration 2 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 21:46:07,597 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 21:46:07,597 INFO L82 PathProgramCache]: Analyzing trace with hash 1935305038, now seen corresponding path program 1 times [2020-10-23 21:46:07,597 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 21:46:07,597 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1208552330] [2020-10-23 21:46:07,598 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 21:46:07,601 INFO L321 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-10-23 21:46:07,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:46:07,734 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 21:46:07,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:46:07,748 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 21:46:07,749 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1208552330] [2020-10-23 21:46:07,749 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 21:46:07,749 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-10-23 21:46:07,750 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [630140004] [2020-10-23 21:46:07,751 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-10-23 21:46:07,751 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 21:46:07,752 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-10-23 21:46:07,752 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-10-23 21:46:07,753 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand 6 states. [2020-10-23 21:46:08,104 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 21:46:08,105 INFO L93 Difference]: Finished difference Result 42 states and 44 transitions. [2020-10-23 21:46:08,106 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-10-23 21:46:08,106 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 23 [2020-10-23 21:46:08,106 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 21:46:08,107 INFO L225 Difference]: With dead ends: 42 [2020-10-23 21:46:08,108 INFO L226 Difference]: Without dead ends: 35 [2020-10-23 21:46:08,109 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2020-10-23 21:46:08,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-10-23 21:46:08,121 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 34. [2020-10-23 21:46:08,121 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-10-23 21:46:08,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 36 transitions. [2020-10-23 21:46:08,123 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 36 transitions. Word has length 23 [2020-10-23 21:46:08,123 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 21:46:08,123 INFO L481 AbstractCegarLoop]: Abstraction has 34 states and 36 transitions. [2020-10-23 21:46:08,123 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-10-23 21:46:08,123 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 36 transitions. [2020-10-23 21:46:08,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-10-23 21:46:08,124 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 21:46:08,125 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 21:46:08,125 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-10-23 21:46:08,125 INFO L429 AbstractCegarLoop]: === Iteration 3 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 21:46:08,126 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 21:46:08,126 INFO L82 PathProgramCache]: Analyzing trace with hash -1625328538, now seen corresponding path program 1 times [2020-10-23 21:46:08,126 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 21:46:08,127 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [442049239] [2020-10-23 21:46:08,127 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 21:46:10,414 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation PRECISE [2020-10-23 21:46:10,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:46:10,792 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 21:46:10,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:46:10,804 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 21:46:10,973 WARN L193 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 57 DAG size of output: 48 [2020-10-23 21:46:11,237 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 33 [2020-10-23 21:46:11,375 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 33 [2020-10-23 21:46:11,832 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [442049239] [2020-10-23 21:46:11,833 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 21:46:11,833 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2020-10-23 21:46:11,833 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [513475621] [2020-10-23 21:46:11,834 INFO L461 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-10-23 21:46:11,834 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 21:46:11,835 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-10-23 21:46:11,836 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=216, Unknown=0, NotChecked=0, Total=272 [2020-10-23 21:46:11,836 INFO L87 Difference]: Start difference. First operand 34 states and 36 transitions. Second operand 15 states. [2020-10-23 21:46:12,792 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 82 DAG size of output: 56 [2020-10-23 21:46:13,014 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 82 DAG size of output: 56 [2020-10-23 21:46:13,200 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 21:46:13,200 INFO L93 Difference]: Finished difference Result 61 states and 67 transitions. [2020-10-23 21:46:13,200 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-10-23 21:46:13,201 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 29 [2020-10-23 21:46:13,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 21:46:13,204 INFO L225 Difference]: With dead ends: 61 [2020-10-23 21:46:13,204 INFO L226 Difference]: Without dead ends: 40 [2020-10-23 21:46:13,206 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 169 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=150, Invalid=662, Unknown=0, NotChecked=0, Total=812 [2020-10-23 21:46:13,206 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-10-23 21:46:13,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 37. [2020-10-23 21:46:13,217 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-10-23 21:46:13,218 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 39 transitions. [2020-10-23 21:46:13,219 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 39 transitions. Word has length 29 [2020-10-23 21:46:13,219 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 21:46:13,219 INFO L481 AbstractCegarLoop]: Abstraction has 37 states and 39 transitions. [2020-10-23 21:46:13,219 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-10-23 21:46:13,219 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 39 transitions. [2020-10-23 21:46:13,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-10-23 21:46:13,220 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 21:46:13,221 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 21:46:13,221 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-10-23 21:46:13,221 INFO L429 AbstractCegarLoop]: === Iteration 4 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 21:46:13,222 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 21:46:13,222 INFO L82 PathProgramCache]: Analyzing trace with hash -1487589007, now seen corresponding path program 1 times [2020-10-23 21:46:13,222 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 21:46:13,222 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [591842529] [2020-10-23 21:46:13,223 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 21:46:16,075 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:46:16,157 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:46:18,231 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:46:18,292 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:46:18,790 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-23 21:46:18,795 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:46:18,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:46:19,019 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 21:46:19,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:46:19,030 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 21:46:19,290 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [591842529] [2020-10-23 21:46:19,291 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 21:46:19,291 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2020-10-23 21:46:19,292 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [323469570] [2020-10-23 21:46:19,293 INFO L461 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-10-23 21:46:19,293 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 21:46:19,295 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-10-23 21:46:19,296 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=318, Unknown=0, NotChecked=0, Total=380 [2020-10-23 21:46:19,296 INFO L87 Difference]: Start difference. First operand 37 states and 39 transitions. Second operand 18 states. [2020-10-23 21:46:20,402 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 21:46:20,403 INFO L93 Difference]: Finished difference Result 70 states and 77 transitions. [2020-10-23 21:46:20,403 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-10-23 21:46:20,404 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 34 [2020-10-23 21:46:20,404 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 21:46:20,407 INFO L225 Difference]: With dead ends: 70 [2020-10-23 21:46:20,407 INFO L226 Difference]: Without dead ends: 51 [2020-10-23 21:46:20,412 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 350 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=201, Invalid=1205, Unknown=0, NotChecked=0, Total=1406 [2020-10-23 21:46:20,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-10-23 21:46:20,436 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 47. [2020-10-23 21:46:20,436 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-10-23 21:46:20,439 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 51 transitions. [2020-10-23 21:46:20,440 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 51 transitions. Word has length 34 [2020-10-23 21:46:20,440 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 21:46:20,440 INFO L481 AbstractCegarLoop]: Abstraction has 47 states and 51 transitions. [2020-10-23 21:46:20,441 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-10-23 21:46:20,443 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 51 transitions. [2020-10-23 21:46:20,447 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-10-23 21:46:20,447 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 21:46:20,447 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 21:46:20,448 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-10-23 21:46:20,448 INFO L429 AbstractCegarLoop]: === Iteration 5 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 21:46:20,448 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 21:46:20,449 INFO L82 PathProgramCache]: Analyzing trace with hash 250798918, now seen corresponding path program 2 times [2020-10-23 21:46:20,449 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 21:46:20,451 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1240571851] [2020-10-23 21:46:20,451 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 21:46:23,127 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:46:23,191 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:46:25,692 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:46:25,743 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:46:26,488 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-23 21:46:26,491 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:46:26,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:46:26,755 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 21:46:26,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:46:26,765 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 21:46:27,228 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1240571851] [2020-10-23 21:46:27,229 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 21:46:27,229 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2020-10-23 21:46:27,229 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [686563336] [2020-10-23 21:46:27,230 INFO L461 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-10-23 21:46:27,230 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 21:46:27,231 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-10-23 21:46:27,232 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=476, Unknown=0, NotChecked=0, Total=552 [2020-10-23 21:46:27,232 INFO L87 Difference]: Start difference. First operand 47 states and 51 transitions. Second operand 22 states. [2020-10-23 21:46:28,655 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 21:46:28,656 INFO L93 Difference]: Finished difference Result 85 states and 94 transitions. [2020-10-23 21:46:28,658 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-10-23 21:46:28,658 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 39 [2020-10-23 21:46:28,658 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 21:46:28,659 INFO L225 Difference]: With dead ends: 85 [2020-10-23 21:46:28,660 INFO L226 Difference]: Without dead ends: 56 [2020-10-23 21:46:28,662 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 7 SyntacticMatches, 2 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 560 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=243, Invalid=1827, Unknown=0, NotChecked=0, Total=2070 [2020-10-23 21:46:28,662 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-10-23 21:46:28,676 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 52. [2020-10-23 21:46:28,676 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-10-23 21:46:28,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 56 transitions. [2020-10-23 21:46:28,677 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 56 transitions. Word has length 39 [2020-10-23 21:46:28,678 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 21:46:28,678 INFO L481 AbstractCegarLoop]: Abstraction has 52 states and 56 transitions. [2020-10-23 21:46:28,678 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-10-23 21:46:28,678 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 56 transitions. [2020-10-23 21:46:28,679 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-10-23 21:46:28,679 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 21:46:28,679 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 21:46:28,680 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-10-23 21:46:28,680 INFO L429 AbstractCegarLoop]: === Iteration 6 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 21:46:28,680 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 21:46:28,680 INFO L82 PathProgramCache]: Analyzing trace with hash 1454640785, now seen corresponding path program 3 times [2020-10-23 21:46:28,681 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 21:46:28,681 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1345588875] [2020-10-23 21:46:28,681 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 21:46:32,974 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:46:33,032 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:46:35,482 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-23 21:46:35,486 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:46:35,542 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:46:36,258 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:46:36,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:46:36,537 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 21:46:36,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:46:36,547 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 21:46:37,211 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1345588875] [2020-10-23 21:46:37,211 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 21:46:37,211 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2020-10-23 21:46:37,212 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1099243805] [2020-10-23 21:46:37,212 INFO L461 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-10-23 21:46:37,213 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 21:46:37,213 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-10-23 21:46:37,214 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=666, Unknown=0, NotChecked=0, Total=756 [2020-10-23 21:46:37,214 INFO L87 Difference]: Start difference. First operand 52 states and 56 transitions. Second operand 26 states. [2020-10-23 21:46:39,017 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 21:46:39,018 INFO L93 Difference]: Finished difference Result 95 states and 104 transitions. [2020-10-23 21:46:39,018 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-10-23 21:46:39,018 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 44 [2020-10-23 21:46:39,019 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 21:46:39,020 INFO L225 Difference]: With dead ends: 95 [2020-10-23 21:46:39,020 INFO L226 Difference]: Without dead ends: 61 [2020-10-23 21:46:39,024 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 7 SyntacticMatches, 3 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 817 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=285, Invalid=2577, Unknown=0, NotChecked=0, Total=2862 [2020-10-23 21:46:39,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-10-23 21:46:39,056 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 57. [2020-10-23 21:46:39,057 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-10-23 21:46:39,058 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 61 transitions. [2020-10-23 21:46:39,058 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 61 transitions. Word has length 44 [2020-10-23 21:46:39,059 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 21:46:39,059 INFO L481 AbstractCegarLoop]: Abstraction has 57 states and 61 transitions. [2020-10-23 21:46:39,059 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-10-23 21:46:39,059 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 61 transitions. [2020-10-23 21:46:39,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-10-23 21:46:39,061 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 21:46:39,062 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 21:46:39,063 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-10-23 21:46:39,063 INFO L429 AbstractCegarLoop]: === Iteration 7 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 21:46:39,064 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 21:46:39,064 INFO L82 PathProgramCache]: Analyzing trace with hash -1611580890, now seen corresponding path program 4 times [2020-10-23 21:46:39,064 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 21:46:39,064 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1063391375] [2020-10-23 21:46:39,064 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 21:46:43,344 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:46:43,395 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:46:46,208 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-23 21:46:46,211 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:46:46,267 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:46:47,067 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-23 21:46:47,069 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:46:47,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:46:47,322 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 21:46:47,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:46:47,331 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 21:46:48,193 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1063391375] [2020-10-23 21:46:48,194 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 21:46:48,194 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2020-10-23 21:46:48,194 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [616786438] [2020-10-23 21:46:48,194 INFO L461 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-10-23 21:46:48,195 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 21:46:48,195 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-10-23 21:46:48,196 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=888, Unknown=0, NotChecked=0, Total=992 [2020-10-23 21:46:48,196 INFO L87 Difference]: Start difference. First operand 57 states and 61 transitions. Second operand 30 states. [2020-10-23 21:46:50,322 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 21:46:50,322 INFO L93 Difference]: Finished difference Result 105 states and 114 transitions. [2020-10-23 21:46:50,323 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-10-23 21:46:50,323 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 49 [2020-10-23 21:46:50,324 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 21:46:50,325 INFO L225 Difference]: With dead ends: 105 [2020-10-23 21:46:50,325 INFO L226 Difference]: Without dead ends: 66 [2020-10-23 21:46:50,327 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 7 SyntacticMatches, 4 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1121 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=327, Invalid=3455, Unknown=0, NotChecked=0, Total=3782 [2020-10-23 21:46:50,328 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-10-23 21:46:50,341 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 62. [2020-10-23 21:46:50,341 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2020-10-23 21:46:50,343 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 66 transitions. [2020-10-23 21:46:50,343 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 66 transitions. Word has length 49 [2020-10-23 21:46:50,343 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 21:46:50,343 INFO L481 AbstractCegarLoop]: Abstraction has 62 states and 66 transitions. [2020-10-23 21:46:50,344 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-10-23 21:46:50,344 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 66 transitions. [2020-10-23 21:46:50,344 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-10-23 21:46:50,345 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 21:46:50,345 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 21:46:50,345 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-10-23 21:46:50,345 INFO L429 AbstractCegarLoop]: === Iteration 8 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 21:46:50,346 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 21:46:50,346 INFO L82 PathProgramCache]: Analyzing trace with hash -210173007, now seen corresponding path program 5 times [2020-10-23 21:46:50,346 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 21:46:50,347 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1426324077] [2020-10-23 21:46:50,347 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 21:46:54,615 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:46:54,673 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:46:57,536 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:46:57,593 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:46:58,022 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-23 21:46:58,024 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:46:58,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:46:58,271 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 21:46:58,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:46:58,281 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 21:46:59,400 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1426324077] [2020-10-23 21:46:59,401 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 21:46:59,401 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2020-10-23 21:46:59,401 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [517878535] [2020-10-23 21:46:59,402 INFO L461 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-10-23 21:46:59,402 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 21:46:59,403 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-10-23 21:46:59,403 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=1142, Unknown=0, NotChecked=0, Total=1260 [2020-10-23 21:46:59,403 INFO L87 Difference]: Start difference. First operand 62 states and 66 transitions. Second operand 34 states. [2020-10-23 21:47:01,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 21:47:01,907 INFO L93 Difference]: Finished difference Result 115 states and 124 transitions. [2020-10-23 21:47:01,908 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-10-23 21:47:01,909 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 54 [2020-10-23 21:47:01,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 21:47:01,910 INFO L225 Difference]: With dead ends: 115 [2020-10-23 21:47:01,910 INFO L226 Difference]: Without dead ends: 71 [2020-10-23 21:47:01,913 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 7 SyntacticMatches, 5 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1472 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=369, Invalid=4461, Unknown=0, NotChecked=0, Total=4830 [2020-10-23 21:47:01,913 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2020-10-23 21:47:01,928 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 67. [2020-10-23 21:47:01,929 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-10-23 21:47:01,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 71 transitions. [2020-10-23 21:47:01,930 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 71 transitions. Word has length 54 [2020-10-23 21:47:01,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 21:47:01,930 INFO L481 AbstractCegarLoop]: Abstraction has 67 states and 71 transitions. [2020-10-23 21:47:01,931 INFO L482 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-10-23 21:47:01,931 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 71 transitions. [2020-10-23 21:47:01,932 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2020-10-23 21:47:01,932 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 21:47:01,932 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 21:47:01,932 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-10-23 21:47:01,932 INFO L429 AbstractCegarLoop]: === Iteration 9 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 21:47:01,933 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 21:47:01,933 INFO L82 PathProgramCache]: Analyzing trace with hash -1483179770, now seen corresponding path program 6 times [2020-10-23 21:47:01,933 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 21:47:01,933 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1886374578] [2020-10-23 21:47:01,934 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 21:47:04,588 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:47:04,634 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:47:07,504 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-23 21:47:07,506 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:47:07,563 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:47:08,003 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:47:08,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:47:08,302 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 21:47:08,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:47:08,314 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 21:47:09,700 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1886374578] [2020-10-23 21:47:09,701 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 21:47:09,701 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [37] imperfect sequences [] total 37 [2020-10-23 21:47:09,701 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [912172310] [2020-10-23 21:47:09,702 INFO L461 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-10-23 21:47:09,702 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 21:47:09,703 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-10-23 21:47:09,704 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=148, Invalid=1412, Unknown=0, NotChecked=0, Total=1560 [2020-10-23 21:47:09,705 INFO L87 Difference]: Start difference. First operand 67 states and 71 transitions. Second operand 38 states. [2020-10-23 21:47:12,785 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 21:47:12,785 INFO L93 Difference]: Finished difference Result 125 states and 134 transitions. [2020-10-23 21:47:12,787 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-10-23 21:47:12,787 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 59 [2020-10-23 21:47:12,787 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 21:47:12,788 INFO L225 Difference]: With dead ends: 125 [2020-10-23 21:47:12,788 INFO L226 Difference]: Without dead ends: 76 [2020-10-23 21:47:12,791 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 7 SyntacticMatches, 6 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1863 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=444, Invalid=5562, Unknown=0, NotChecked=0, Total=6006 [2020-10-23 21:47:12,791 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-10-23 21:47:12,805 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 72. [2020-10-23 21:47:12,806 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-10-23 21:47:12,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 76 transitions. [2020-10-23 21:47:12,807 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 76 transitions. Word has length 59 [2020-10-23 21:47:12,807 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 21:47:12,807 INFO L481 AbstractCegarLoop]: Abstraction has 72 states and 76 transitions. [2020-10-23 21:47:12,807 INFO L482 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-10-23 21:47:12,808 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 76 transitions. [2020-10-23 21:47:12,808 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-10-23 21:47:12,809 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 21:47:12,809 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 21:47:12,809 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-10-23 21:47:12,809 INFO L429 AbstractCegarLoop]: === Iteration 10 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 21:47:12,810 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 21:47:12,810 INFO L82 PathProgramCache]: Analyzing trace with hash -421130031, now seen corresponding path program 7 times [2020-10-23 21:47:12,810 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 21:47:12,810 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [617482169] [2020-10-23 21:47:12,810 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 21:47:17,135 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:47:17,190 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:47:20,074 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:47:20,127 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:47:20,565 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-23 21:47:20,568 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:47:20,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:47:20,837 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 21:47:20,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:47:20,848 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 21:47:22,551 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [617482169] [2020-10-23 21:47:22,551 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 21:47:22,551 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [41] imperfect sequences [] total 41 [2020-10-23 21:47:22,551 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1559852937] [2020-10-23 21:47:22,552 INFO L461 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-10-23 21:47:22,552 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 21:47:22,553 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-10-23 21:47:22,554 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=146, Invalid=1746, Unknown=0, NotChecked=0, Total=1892 [2020-10-23 21:47:22,555 INFO L87 Difference]: Start difference. First operand 72 states and 76 transitions. Second operand 42 states. [2020-10-23 21:47:26,146 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 21:47:26,146 INFO L93 Difference]: Finished difference Result 135 states and 144 transitions. [2020-10-23 21:47:26,150 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-10-23 21:47:26,151 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 64 [2020-10-23 21:47:26,151 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 21:47:26,152 INFO L225 Difference]: With dead ends: 135 [2020-10-23 21:47:26,152 INFO L226 Difference]: Without dead ends: 81 [2020-10-23 21:47:26,155 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 8 SyntacticMatches, 6 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2315 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=453, Invalid=6857, Unknown=0, NotChecked=0, Total=7310 [2020-10-23 21:47:26,156 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2020-10-23 21:47:26,174 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 77. [2020-10-23 21:47:26,174 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-10-23 21:47:26,175 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 81 transitions. [2020-10-23 21:47:26,175 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 81 transitions. Word has length 64 [2020-10-23 21:47:26,175 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 21:47:26,175 INFO L481 AbstractCegarLoop]: Abstraction has 77 states and 81 transitions. [2020-10-23 21:47:26,176 INFO L482 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-10-23 21:47:26,176 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 81 transitions. [2020-10-23 21:47:26,177 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-10-23 21:47:26,177 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 21:47:26,177 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 21:47:26,177 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-10-23 21:47:26,177 INFO L429 AbstractCegarLoop]: === Iteration 11 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 21:47:26,178 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 21:47:26,178 INFO L82 PathProgramCache]: Analyzing trace with hash 904306662, now seen corresponding path program 8 times [2020-10-23 21:47:26,178 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 21:47:26,178 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1606740844] [2020-10-23 21:47:26,179 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 21:47:30,493 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:47:30,562 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:47:33,427 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:47:33,484 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:47:33,921 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-23 21:47:33,923 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:47:33,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:47:34,167 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 21:47:34,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:47:34,175 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 21:47:36,221 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1606740844] [2020-10-23 21:47:36,222 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 21:47:36,222 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [45] imperfect sequences [] total 45 [2020-10-23 21:47:36,222 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1332099745] [2020-10-23 21:47:36,223 INFO L461 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-10-23 21:47:36,224 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 21:47:36,224 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-10-23 21:47:36,225 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=180, Invalid=2076, Unknown=0, NotChecked=0, Total=2256 [2020-10-23 21:47:36,225 INFO L87 Difference]: Start difference. First operand 77 states and 81 transitions. Second operand 46 states. [2020-10-23 21:47:40,380 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 21:47:40,380 INFO L93 Difference]: Finished difference Result 145 states and 154 transitions. [2020-10-23 21:47:40,381 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2020-10-23 21:47:40,381 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 69 [2020-10-23 21:47:40,381 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 21:47:40,382 INFO L225 Difference]: With dead ends: 145 [2020-10-23 21:47:40,382 INFO L226 Difference]: Without dead ends: 86 [2020-10-23 21:47:40,386 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 7 SyntacticMatches, 8 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2798 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=536, Invalid=8206, Unknown=0, NotChecked=0, Total=8742 [2020-10-23 21:47:40,387 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-10-23 21:47:40,400 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 82. [2020-10-23 21:47:40,400 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2020-10-23 21:47:40,401 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 86 transitions. [2020-10-23 21:47:40,401 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 86 transitions. Word has length 69 [2020-10-23 21:47:40,402 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 21:47:40,402 INFO L481 AbstractCegarLoop]: Abstraction has 82 states and 86 transitions. [2020-10-23 21:47:40,402 INFO L482 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-10-23 21:47:40,402 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 86 transitions. [2020-10-23 21:47:40,403 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2020-10-23 21:47:40,403 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 21:47:40,404 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 21:47:40,404 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-10-23 21:47:40,404 INFO L429 AbstractCegarLoop]: === Iteration 12 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 21:47:40,404 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 21:47:40,404 INFO L82 PathProgramCache]: Analyzing trace with hash 1874671089, now seen corresponding path program 9 times [2020-10-23 21:47:40,405 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 21:47:40,405 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [444163598] [2020-10-23 21:47:40,405 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 21:47:44,702 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:47:44,762 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:47:47,697 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:47:47,751 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:47:48,189 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-23 21:47:48,191 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:47:48,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:47:48,420 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 21:47:48,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:47:48,429 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 21:47:50,880 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [444163598] [2020-10-23 21:47:50,881 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 21:47:50,881 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [49] imperfect sequences [] total 49 [2020-10-23 21:47:50,881 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1365765304] [2020-10-23 21:47:50,882 INFO L461 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-10-23 21:47:50,882 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 21:47:50,883 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-10-23 21:47:50,884 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=2478, Unknown=0, NotChecked=0, Total=2652 [2020-10-23 21:47:50,884 INFO L87 Difference]: Start difference. First operand 82 states and 86 transitions. Second operand 50 states. [2020-10-23 21:47:55,738 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 21:47:55,738 INFO L93 Difference]: Finished difference Result 155 states and 164 transitions. [2020-10-23 21:47:55,739 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2020-10-23 21:47:55,739 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 74 [2020-10-23 21:47:55,740 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 21:47:55,741 INFO L225 Difference]: With dead ends: 155 [2020-10-23 21:47:55,741 INFO L226 Difference]: Without dead ends: 91 [2020-10-23 21:47:55,744 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 8 SyntacticMatches, 8 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3346 ImplicationChecksByTransitivity, 5.8s TimeCoverageRelationStatistics Valid=537, Invalid=9765, Unknown=0, NotChecked=0, Total=10302 [2020-10-23 21:47:55,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2020-10-23 21:47:55,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 87. [2020-10-23 21:47:55,763 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2020-10-23 21:47:55,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 91 transitions. [2020-10-23 21:47:55,764 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 91 transitions. Word has length 74 [2020-10-23 21:47:55,764 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 21:47:55,764 INFO L481 AbstractCegarLoop]: Abstraction has 87 states and 91 transitions. [2020-10-23 21:47:55,764 INFO L482 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-10-23 21:47:55,764 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 91 transitions. [2020-10-23 21:47:55,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2020-10-23 21:47:55,765 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 21:47:55,765 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 21:47:55,765 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-10-23 21:47:55,766 INFO L429 AbstractCegarLoop]: === Iteration 13 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 21:47:55,766 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 21:47:55,766 INFO L82 PathProgramCache]: Analyzing trace with hash -178671930, now seen corresponding path program 10 times [2020-10-23 21:47:55,766 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 21:47:55,767 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2809808] [2020-10-23 21:47:55,767 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 21:48:00,046 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:48:00,104 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:48:02,635 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-23 21:48:02,637 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:48:02,698 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:48:03,598 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-23 21:48:03,601 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:48:03,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:48:03,852 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 21:48:03,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:48:03,859 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 21:48:06,777 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2809808] [2020-10-23 21:48:06,778 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 21:48:06,778 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [53] imperfect sequences [] total 53 [2020-10-23 21:48:06,778 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [309341015] [2020-10-23 21:48:06,779 INFO L461 AbstractCegarLoop]: Interpolant automaton has 54 states [2020-10-23 21:48:06,779 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 21:48:06,780 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2020-10-23 21:48:06,780 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=188, Invalid=2892, Unknown=0, NotChecked=0, Total=3080 [2020-10-23 21:48:06,780 INFO L87 Difference]: Start difference. First operand 87 states and 91 transitions. Second operand 54 states. [2020-10-23 21:48:12,478 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 21:48:12,479 INFO L93 Difference]: Finished difference Result 165 states and 174 transitions. [2020-10-23 21:48:12,479 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2020-10-23 21:48:12,480 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 79 [2020-10-23 21:48:12,480 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 21:48:12,481 INFO L225 Difference]: With dead ends: 165 [2020-10-23 21:48:12,481 INFO L226 Difference]: Without dead ends: 96 [2020-10-23 21:48:12,483 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 7 SyntacticMatches, 10 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3932 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=579, Invalid=11411, Unknown=0, NotChecked=0, Total=11990 [2020-10-23 21:48:12,483 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-10-23 21:48:12,504 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 92. [2020-10-23 21:48:12,504 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2020-10-23 21:48:12,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 96 transitions. [2020-10-23 21:48:12,505 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 96 transitions. Word has length 79 [2020-10-23 21:48:12,506 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 21:48:12,506 INFO L481 AbstractCegarLoop]: Abstraction has 92 states and 96 transitions. [2020-10-23 21:48:12,506 INFO L482 AbstractCegarLoop]: Interpolant automaton has 54 states. [2020-10-23 21:48:12,506 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 96 transitions. [2020-10-23 21:48:12,507 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2020-10-23 21:48:12,507 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 21:48:12,507 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 21:48:12,507 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-10-23 21:48:12,508 INFO L429 AbstractCegarLoop]: === Iteration 14 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 21:48:12,508 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 21:48:12,508 INFO L82 PathProgramCache]: Analyzing trace with hash -1035963631, now seen corresponding path program 11 times [2020-10-23 21:48:12,508 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 21:48:12,509 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1148396567] [2020-10-23 21:48:12,509 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 21:48:15,281 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:48:15,338 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:48:17,882 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-23 21:48:17,884 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:48:17,941 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:48:18,883 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:48:18,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:48:19,127 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 21:48:19,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:48:19,133 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 21:48:22,504 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1148396567] [2020-10-23 21:48:22,505 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 21:48:22,505 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [57] imperfect sequences [] total 57 [2020-10-23 21:48:22,506 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [204263791] [2020-10-23 21:48:22,506 INFO L461 AbstractCegarLoop]: Interpolant automaton has 58 states [2020-10-23 21:48:22,507 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 21:48:22,507 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2020-10-23 21:48:22,507 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=202, Invalid=3338, Unknown=0, NotChecked=0, Total=3540 [2020-10-23 21:48:22,508 INFO L87 Difference]: Start difference. First operand 92 states and 96 transitions. Second operand 58 states. [2020-10-23 21:48:28,834 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 21:48:28,834 INFO L93 Difference]: Finished difference Result 175 states and 184 transitions. [2020-10-23 21:48:28,835 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2020-10-23 21:48:28,836 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 84 [2020-10-23 21:48:28,836 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 21:48:28,837 INFO L225 Difference]: With dead ends: 175 [2020-10-23 21:48:28,837 INFO L226 Difference]: Without dead ends: 101 [2020-10-23 21:48:28,839 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 7 SyntacticMatches, 11 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4565 ImplicationChecksByTransitivity, 7.6s TimeCoverageRelationStatistics Valid=621, Invalid=13185, Unknown=0, NotChecked=0, Total=13806 [2020-10-23 21:48:28,840 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2020-10-23 21:48:28,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 97. [2020-10-23 21:48:28,857 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2020-10-23 21:48:28,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 101 transitions. [2020-10-23 21:48:28,857 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 101 transitions. Word has length 84 [2020-10-23 21:48:28,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 21:48:28,858 INFO L481 AbstractCegarLoop]: Abstraction has 97 states and 101 transitions. [2020-10-23 21:48:28,858 INFO L482 AbstractCegarLoop]: Interpolant automaton has 58 states. [2020-10-23 21:48:28,858 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 101 transitions. [2020-10-23 21:48:28,859 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2020-10-23 21:48:28,859 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 21:48:28,859 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 13, 13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 21:48:28,859 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-10-23 21:48:28,859 INFO L429 AbstractCegarLoop]: === Iteration 15 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 21:48:28,859 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 21:48:28,860 INFO L82 PathProgramCache]: Analyzing trace with hash 183477670, now seen corresponding path program 12 times [2020-10-23 21:48:28,860 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 21:48:28,860 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1989971079] [2020-10-23 21:48:28,860 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 21:48:31,628 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:48:31,685 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:48:34,911 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:48:34,980 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:48:36,067 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 65 DAG size of output: 64 [2020-10-23 21:48:36,069 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:48:36,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:48:36,299 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 21:48:36,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:48:36,306 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 21:48:40,240 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1989971079] [2020-10-23 21:48:40,241 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 21:48:40,241 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [61] imperfect sequences [] total 61 [2020-10-23 21:48:40,241 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [829480504] [2020-10-23 21:48:40,241 INFO L461 AbstractCegarLoop]: Interpolant automaton has 62 states [2020-10-23 21:48:40,242 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 21:48:40,242 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2020-10-23 21:48:40,243 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=216, Invalid=3816, Unknown=0, NotChecked=0, Total=4032 [2020-10-23 21:48:40,243 INFO L87 Difference]: Start difference. First operand 97 states and 101 transitions. Second operand 62 states. [2020-10-23 21:48:47,513 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 21:48:47,513 INFO L93 Difference]: Finished difference Result 185 states and 194 transitions. [2020-10-23 21:48:47,514 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2020-10-23 21:48:47,514 INFO L78 Accepts]: Start accepts. Automaton has 62 states. Word has length 89 [2020-10-23 21:48:47,515 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 21:48:47,515 INFO L225 Difference]: With dead ends: 185 [2020-10-23 21:48:47,516 INFO L226 Difference]: Without dead ends: 106 [2020-10-23 21:48:47,517 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 7 SyntacticMatches, 12 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5245 ImplicationChecksByTransitivity, 8.8s TimeCoverageRelationStatistics Valid=663, Invalid=15087, Unknown=0, NotChecked=0, Total=15750 [2020-10-23 21:48:47,518 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-10-23 21:48:47,535 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 102. [2020-10-23 21:48:47,535 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2020-10-23 21:48:47,536 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 106 transitions. [2020-10-23 21:48:47,536 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 106 transitions. Word has length 89 [2020-10-23 21:48:47,536 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 21:48:47,536 INFO L481 AbstractCegarLoop]: Abstraction has 102 states and 106 transitions. [2020-10-23 21:48:47,536 INFO L482 AbstractCegarLoop]: Interpolant automaton has 62 states. [2020-10-23 21:48:47,537 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 106 transitions. [2020-10-23 21:48:47,537 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2020-10-23 21:48:47,537 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 21:48:47,538 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 14, 14, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 21:48:47,538 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-10-23 21:48:47,538 INFO L429 AbstractCegarLoop]: === Iteration 16 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 21:48:47,538 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 21:48:47,539 INFO L82 PathProgramCache]: Analyzing trace with hash 674351153, now seen corresponding path program 13 times [2020-10-23 21:48:47,539 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 21:48:47,539 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1874215717] [2020-10-23 21:48:47,539 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 21:48:51,850 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:48:51,909 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:48:54,994 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-23 21:48:54,996 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:48:55,054 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:48:56,039 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-23 21:48:56,042 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:48:56,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:48:56,290 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 21:48:56,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:48:56,297 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 21:49:00,856 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1874215717] [2020-10-23 21:49:00,856 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 21:49:00,857 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [65] imperfect sequences [] total 65 [2020-10-23 21:49:00,857 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2018797122] [2020-10-23 21:49:00,858 INFO L461 AbstractCegarLoop]: Interpolant automaton has 66 states [2020-10-23 21:49:00,858 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 21:49:00,858 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2020-10-23 21:49:00,859 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=230, Invalid=4326, Unknown=0, NotChecked=0, Total=4556 [2020-10-23 21:49:00,859 INFO L87 Difference]: Start difference. First operand 102 states and 106 transitions. Second operand 66 states. [2020-10-23 21:49:09,129 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 21:49:09,130 INFO L93 Difference]: Finished difference Result 195 states and 204 transitions. [2020-10-23 21:49:09,133 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2020-10-23 21:49:09,133 INFO L78 Accepts]: Start accepts. Automaton has 66 states. Word has length 94 [2020-10-23 21:49:09,133 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 21:49:09,134 INFO L225 Difference]: With dead ends: 195 [2020-10-23 21:49:09,134 INFO L226 Difference]: Without dead ends: 111 [2020-10-23 21:49:09,137 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 7 SyntacticMatches, 13 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5972 ImplicationChecksByTransitivity, 10.0s TimeCoverageRelationStatistics Valid=705, Invalid=17117, Unknown=0, NotChecked=0, Total=17822 [2020-10-23 21:49:09,138 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2020-10-23 21:49:09,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 107. [2020-10-23 21:49:09,169 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-10-23 21:49:09,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 111 transitions. [2020-10-23 21:49:09,170 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 111 transitions. Word has length 94 [2020-10-23 21:49:09,170 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 21:49:09,170 INFO L481 AbstractCegarLoop]: Abstraction has 107 states and 111 transitions. [2020-10-23 21:49:09,171 INFO L482 AbstractCegarLoop]: Interpolant automaton has 66 states. [2020-10-23 21:49:09,171 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 111 transitions. [2020-10-23 21:49:09,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2020-10-23 21:49:09,172 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 21:49:09,172 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 15, 15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 21:49:09,172 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-10-23 21:49:09,172 INFO L429 AbstractCegarLoop]: === Iteration 17 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 21:49:09,173 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 21:49:09,173 INFO L82 PathProgramCache]: Analyzing trace with hash -165247866, now seen corresponding path program 14 times [2020-10-23 21:49:09,173 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 21:49:09,173 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2144437095] [2020-10-23 21:49:09,173 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 21:49:13,505 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:49:13,571 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:49:16,690 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-23 21:49:16,691 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:49:16,751 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:49:17,815 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-23 21:49:17,818 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:49:17,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:49:18,116 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 21:49:18,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:49:18,124 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 21:49:23,403 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2144437095] [2020-10-23 21:49:23,403 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 21:49:23,403 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [69] imperfect sequences [] total 69 [2020-10-23 21:49:23,404 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1258019157] [2020-10-23 21:49:23,404 INFO L461 AbstractCegarLoop]: Interpolant automaton has 70 states [2020-10-23 21:49:23,404 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 21:49:23,405 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2020-10-23 21:49:23,406 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=244, Invalid=4868, Unknown=0, NotChecked=0, Total=5112 [2020-10-23 21:49:23,406 INFO L87 Difference]: Start difference. First operand 107 states and 111 transitions. Second operand 70 states. [2020-10-23 21:49:32,983 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 21:49:32,983 INFO L93 Difference]: Finished difference Result 205 states and 214 transitions. [2020-10-23 21:49:32,988 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2020-10-23 21:49:32,989 INFO L78 Accepts]: Start accepts. Automaton has 70 states. Word has length 99 [2020-10-23 21:49:32,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 21:49:32,990 INFO L225 Difference]: With dead ends: 205 [2020-10-23 21:49:32,990 INFO L226 Difference]: Without dead ends: 116 [2020-10-23 21:49:32,991 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 7 SyntacticMatches, 15 SemanticMatches, 140 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6746 ImplicationChecksByTransitivity, 11.5s TimeCoverageRelationStatistics Valid=747, Invalid=19275, Unknown=0, NotChecked=0, Total=20022 [2020-10-23 21:49:32,992 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2020-10-23 21:49:33,013 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 112. [2020-10-23 21:49:33,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2020-10-23 21:49:33,014 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 116 transitions. [2020-10-23 21:49:33,014 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 116 transitions. Word has length 99 [2020-10-23 21:49:33,015 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 21:49:33,015 INFO L481 AbstractCegarLoop]: Abstraction has 112 states and 116 transitions. [2020-10-23 21:49:33,015 INFO L482 AbstractCegarLoop]: Interpolant automaton has 70 states. [2020-10-23 21:49:33,015 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 116 transitions. [2020-10-23 21:49:33,016 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2020-10-23 21:49:33,016 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 21:49:33,016 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 16, 16, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 21:49:33,016 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-10-23 21:49:33,017 INFO L429 AbstractCegarLoop]: === Iteration 18 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 21:49:33,017 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 21:49:33,017 INFO L82 PathProgramCache]: Analyzing trace with hash 550712657, now seen corresponding path program 15 times [2020-10-23 21:49:33,017 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 21:49:33,018 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [871697058] [2020-10-23 21:49:33,018 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 21:49:37,338 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:49:37,400 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:49:40,528 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:49:40,592 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:49:41,736 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-23 21:49:41,738 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:49:41,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:49:42,063 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 21:49:42,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:49:42,070 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 21:49:48,362 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [871697058] [2020-10-23 21:49:48,362 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 21:49:48,363 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [73] imperfect sequences [] total 73 [2020-10-23 21:49:48,363 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [275529199] [2020-10-23 21:49:48,364 INFO L461 AbstractCegarLoop]: Interpolant automaton has 74 states [2020-10-23 21:49:48,364 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 21:49:48,365 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2020-10-23 21:49:48,365 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=264, Invalid=5588, Unknown=0, NotChecked=0, Total=5852 [2020-10-23 21:49:48,365 INFO L87 Difference]: Start difference. First operand 112 states and 116 transitions. Second operand 74 states. [2020-10-23 21:49:59,450 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 21:49:59,450 INFO L93 Difference]: Finished difference Result 215 states and 224 transitions. [2020-10-23 21:49:59,452 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2020-10-23 21:49:59,453 INFO L78 Accepts]: Start accepts. Automaton has 74 states. Word has length 104 [2020-10-23 21:49:59,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 21:49:59,454 INFO L225 Difference]: With dead ends: 215 [2020-10-23 21:49:59,454 INFO L226 Difference]: Without dead ends: 121 [2020-10-23 21:49:59,456 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 7 SyntacticMatches, 14 SemanticMatches, 149 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7810 ImplicationChecksByTransitivity, 13.5s TimeCoverageRelationStatistics Valid=795, Invalid=21855, Unknown=0, NotChecked=0, Total=22650 [2020-10-23 21:49:59,457 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2020-10-23 21:49:59,483 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 117. [2020-10-23 21:49:59,484 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 117 states. [2020-10-23 21:49:59,484 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 121 transitions. [2020-10-23 21:49:59,484 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 121 transitions. Word has length 104 [2020-10-23 21:49:59,485 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 21:49:59,485 INFO L481 AbstractCegarLoop]: Abstraction has 117 states and 121 transitions. [2020-10-23 21:49:59,485 INFO L482 AbstractCegarLoop]: Interpolant automaton has 74 states. [2020-10-23 21:49:59,485 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 121 transitions. [2020-10-23 21:49:59,486 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-10-23 21:49:59,486 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 21:49:59,486 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 17, 17, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 21:49:59,486 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-10-23 21:49:59,486 INFO L429 AbstractCegarLoop]: === Iteration 19 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 21:49:59,486 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 21:49:59,486 INFO L82 PathProgramCache]: Analyzing trace with hash 1895582566, now seen corresponding path program 16 times [2020-10-23 21:49:59,487 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 21:49:59,487 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1727011180] [2020-10-23 21:49:59,487 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 21:50:03,848 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:50:03,919 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:50:07,059 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:50:07,124 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:50:07,923 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:50:07,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:50:08,176 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 21:50:08,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:50:08,182 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 21:50:15,312 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1727011180] [2020-10-23 21:50:15,312 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 21:50:15,313 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [77] imperfect sequences [] total 77 [2020-10-23 21:50:15,313 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1913347739] [2020-10-23 21:50:15,313 INFO L461 AbstractCegarLoop]: Interpolant automaton has 78 states [2020-10-23 21:50:15,313 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 21:50:15,314 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 78 interpolants. [2020-10-23 21:50:15,315 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=272, Invalid=6048, Unknown=0, NotChecked=0, Total=6320 [2020-10-23 21:50:15,315 INFO L87 Difference]: Start difference. First operand 117 states and 121 transitions. Second operand 78 states. [2020-10-23 21:50:27,703 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 21:50:27,704 INFO L93 Difference]: Finished difference Result 225 states and 234 transitions. [2020-10-23 21:50:27,705 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2020-10-23 21:50:27,705 INFO L78 Accepts]: Start accepts. Automaton has 78 states. Word has length 109 [2020-10-23 21:50:27,706 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 21:50:27,706 INFO L225 Difference]: With dead ends: 225 [2020-10-23 21:50:27,707 INFO L226 Difference]: Without dead ends: 126 [2020-10-23 21:50:27,708 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 179 GetRequests, 7 SyntacticMatches, 16 SemanticMatches, 156 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8435 ImplicationChecksByTransitivity, 15.1s TimeCoverageRelationStatistics Valid=831, Invalid=23975, Unknown=0, NotChecked=0, Total=24806 [2020-10-23 21:50:27,708 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2020-10-23 21:50:27,728 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 122. [2020-10-23 21:50:27,729 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 122 states. [2020-10-23 21:50:27,730 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 126 transitions. [2020-10-23 21:50:27,730 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 126 transitions. Word has length 109 [2020-10-23 21:50:27,730 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 21:50:27,730 INFO L481 AbstractCegarLoop]: Abstraction has 122 states and 126 transitions. [2020-10-23 21:50:27,730 INFO L482 AbstractCegarLoop]: Interpolant automaton has 78 states. [2020-10-23 21:50:27,730 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 126 transitions. [2020-10-23 21:50:27,731 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2020-10-23 21:50:27,731 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 21:50:27,731 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 18, 18, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 21:50:27,731 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-10-23 21:50:27,731 INFO L429 AbstractCegarLoop]: === Iteration 20 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 21:50:27,732 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 21:50:27,732 INFO L82 PathProgramCache]: Analyzing trace with hash -2132362639, now seen corresponding path program 17 times [2020-10-23 21:50:27,732 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 21:50:27,732 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [124620343] [2020-10-23 21:50:27,732 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 21:50:32,092 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:50:32,165 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:50:34,936 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-23 21:50:34,938 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:50:35,007 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:50:36,183 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-23 21:50:36,184 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:50:36,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:50:36,477 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 21:50:36,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:50:36,484 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 21:50:44,839 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [124620343] [2020-10-23 21:50:44,839 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 21:50:44,839 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [81] imperfect sequences [] total 81 [2020-10-23 21:50:44,840 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1655089618] [2020-10-23 21:50:44,840 INFO L461 AbstractCegarLoop]: Interpolant automaton has 82 states [2020-10-23 21:50:44,841 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 21:50:44,841 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 82 interpolants. [2020-10-23 21:50:44,842 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=286, Invalid=6686, Unknown=0, NotChecked=0, Total=6972 [2020-10-23 21:50:44,842 INFO L87 Difference]: Start difference. First operand 122 states and 126 transitions. Second operand 82 states. [2020-10-23 21:50:59,040 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 21:50:59,042 INFO L93 Difference]: Finished difference Result 235 states and 244 transitions. [2020-10-23 21:50:59,044 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2020-10-23 21:50:59,045 INFO L78 Accepts]: Start accepts. Automaton has 82 states. Word has length 114 [2020-10-23 21:50:59,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 21:50:59,046 INFO L225 Difference]: With dead ends: 235 [2020-10-23 21:50:59,046 INFO L226 Difference]: Without dead ends: 131 [2020-10-23 21:50:59,048 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 8 SyntacticMatches, 16 SemanticMatches, 164 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9350 ImplicationChecksByTransitivity, 17.5s TimeCoverageRelationStatistics Valid=873, Invalid=26517, Unknown=0, NotChecked=0, Total=27390 [2020-10-23 21:50:59,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2020-10-23 21:50:59,080 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 127. [2020-10-23 21:50:59,080 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 127 states. [2020-10-23 21:50:59,081 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 131 transitions. [2020-10-23 21:50:59,081 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 131 transitions. Word has length 114 [2020-10-23 21:50:59,082 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 21:50:59,082 INFO L481 AbstractCegarLoop]: Abstraction has 127 states and 131 transitions. [2020-10-23 21:50:59,082 INFO L482 AbstractCegarLoop]: Interpolant automaton has 82 states. [2020-10-23 21:50:59,082 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 131 transitions. [2020-10-23 21:50:59,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2020-10-23 21:50:59,083 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 21:50:59,083 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 19, 19, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 21:50:59,083 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-10-23 21:50:59,084 INFO L429 AbstractCegarLoop]: === Iteration 21 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 21:50:59,084 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 21:50:59,084 INFO L82 PathProgramCache]: Analyzing trace with hash 1341061702, now seen corresponding path program 18 times [2020-10-23 21:50:59,084 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 21:50:59,085 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1749568713] [2020-10-23 21:50:59,085 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 21:51:03,509 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:51:03,585 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:51:06,264 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-23 21:51:06,265 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:51:06,343 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:51:06,975 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-23 21:51:06,977 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:51:06,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:51:07,346 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 21:51:07,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:51:07,354 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 21:51:17,057 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1749568713] [2020-10-23 21:51:17,057 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 21:51:17,057 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [85] imperfect sequences [] total 85 [2020-10-23 21:51:17,058 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1790008196] [2020-10-23 21:51:17,058 INFO L461 AbstractCegarLoop]: Interpolant automaton has 86 states [2020-10-23 21:51:17,058 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 21:51:17,059 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2020-10-23 21:51:17,060 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=300, Invalid=7356, Unknown=0, NotChecked=0, Total=7656 [2020-10-23 21:51:17,060 INFO L87 Difference]: Start difference. First operand 127 states and 131 transitions. Second operand 86 states. [2020-10-23 21:51:34,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 21:51:34,002 INFO L93 Difference]: Finished difference Result 245 states and 254 transitions. [2020-10-23 21:51:34,009 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 89 states. [2020-10-23 21:51:34,009 INFO L78 Accepts]: Start accepts. Automaton has 86 states. Word has length 119 [2020-10-23 21:51:34,010 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 21:51:34,011 INFO L225 Difference]: With dead ends: 245 [2020-10-23 21:51:34,011 INFO L226 Difference]: Without dead ends: 136 [2020-10-23 21:51:34,013 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 197 GetRequests, 7 SyntacticMatches, 18 SemanticMatches, 172 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10312 ImplicationChecksByTransitivity, 20.3s TimeCoverageRelationStatistics Valid=915, Invalid=29187, Unknown=0, NotChecked=0, Total=30102 [2020-10-23 21:51:34,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2020-10-23 21:51:34,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 132. [2020-10-23 21:51:34,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 132 states. [2020-10-23 21:51:34,054 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 136 transitions. [2020-10-23 21:51:34,054 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 136 transitions. Word has length 119 [2020-10-23 21:51:34,055 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 21:51:34,055 INFO L481 AbstractCegarLoop]: Abstraction has 132 states and 136 transitions. [2020-10-23 21:51:34,055 INFO L482 AbstractCegarLoop]: Interpolant automaton has 86 states. [2020-10-23 21:51:34,055 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 136 transitions. [2020-10-23 21:51:34,056 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2020-10-23 21:51:34,056 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 21:51:34,056 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 20, 20, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 21:51:34,056 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-10-23 21:51:34,056 INFO L429 AbstractCegarLoop]: === Iteration 22 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 21:51:34,057 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 21:51:34,057 INFO L82 PathProgramCache]: Analyzing trace with hash -1834068079, now seen corresponding path program 19 times [2020-10-23 21:51:34,057 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 21:51:34,057 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [663225638] [2020-10-23 21:51:34,057 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 21:51:37,172 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:51:37,254 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:51:40,809 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 57 [2020-10-23 21:51:40,811 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-23 21:51:40,813 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:51:40,914 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:51:42,582 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 65 DAG size of output: 64 [2020-10-23 21:51:42,585 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:51:42,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:51:42,911 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 21:51:42,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:51:42,917 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 21:51:54,016 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [663225638] [2020-10-23 21:51:54,016 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 21:51:54,016 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [89] imperfect sequences [] total 89 [2020-10-23 21:51:54,017 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [790713459] [2020-10-23 21:51:54,017 INFO L461 AbstractCegarLoop]: Interpolant automaton has 90 states [2020-10-23 21:51:54,017 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 21:51:54,018 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 90 interpolants. [2020-10-23 21:51:54,019 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=314, Invalid=8058, Unknown=0, NotChecked=0, Total=8372 [2020-10-23 21:51:54,019 INFO L87 Difference]: Start difference. First operand 132 states and 136 transitions. Second operand 90 states. [2020-10-23 21:52:13,467 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 21:52:13,467 INFO L93 Difference]: Finished difference Result 255 states and 264 transitions. [2020-10-23 21:52:13,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 93 states. [2020-10-23 21:52:13,470 INFO L78 Accepts]: Start accepts. Automaton has 90 states. Word has length 124 [2020-10-23 21:52:13,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 21:52:13,472 INFO L225 Difference]: With dead ends: 255 [2020-10-23 21:52:13,472 INFO L226 Difference]: Without dead ends: 141 [2020-10-23 21:52:13,476 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 206 GetRequests, 7 SyntacticMatches, 19 SemanticMatches, 180 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11321 ImplicationChecksByTransitivity, 23.0s TimeCoverageRelationStatistics Valid=957, Invalid=31985, Unknown=0, NotChecked=0, Total=32942 [2020-10-23 21:52:13,476 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2020-10-23 21:52:13,510 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 137. [2020-10-23 21:52:13,510 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 137 states. [2020-10-23 21:52:13,511 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 141 transitions. [2020-10-23 21:52:13,511 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 141 transitions. Word has length 124 [2020-10-23 21:52:13,512 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 21:52:13,512 INFO L481 AbstractCegarLoop]: Abstraction has 137 states and 141 transitions. [2020-10-23 21:52:13,512 INFO L482 AbstractCegarLoop]: Interpolant automaton has 90 states. [2020-10-23 21:52:13,512 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 141 transitions. [2020-10-23 21:52:13,513 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2020-10-23 21:52:13,513 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 21:52:13,513 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 21, 21, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 21:52:13,513 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-10-23 21:52:13,514 INFO L429 AbstractCegarLoop]: === Iteration 23 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 21:52:13,514 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 21:52:13,514 INFO L82 PathProgramCache]: Analyzing trace with hash 1643942182, now seen corresponding path program 20 times [2020-10-23 21:52:13,514 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 21:52:13,515 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1085491268] [2020-10-23 21:52:13,515 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 21:52:17,998 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:52:18,093 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:52:21,582 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 57 [2020-10-23 21:52:21,585 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:52:21,670 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:52:23,061 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 65 DAG size of output: 64 [2020-10-23 21:52:23,064 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:52:23,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:52:23,273 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 16 [2020-10-23 21:52:23,412 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 14 [2020-10-23 21:52:23,510 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 21:52:23,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:52:23,517 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 21:52:37,066 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1085491268] [2020-10-23 21:52:37,067 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 21:52:37,067 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [93] imperfect sequences [] total 93 [2020-10-23 21:52:37,067 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1290412097] [2020-10-23 21:52:37,068 INFO L461 AbstractCegarLoop]: Interpolant automaton has 94 states [2020-10-23 21:52:37,068 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 21:52:37,069 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 94 interpolants. [2020-10-23 21:52:37,069 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=372, Invalid=8748, Unknown=0, NotChecked=0, Total=9120 [2020-10-23 21:52:37,070 INFO L87 Difference]: Start difference. First operand 137 states and 141 transitions. Second operand 94 states. [2020-10-23 21:53:00,276 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 21:53:00,276 INFO L93 Difference]: Finished difference Result 265 states and 274 transitions. [2020-10-23 21:53:00,285 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 97 states. [2020-10-23 21:53:00,286 INFO L78 Accepts]: Start accepts. Automaton has 94 states. Word has length 129 [2020-10-23 21:53:00,286 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 21:53:00,287 INFO L225 Difference]: With dead ends: 265 [2020-10-23 21:53:00,288 INFO L226 Difference]: Without dead ends: 146 [2020-10-23 21:53:00,290 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 8 SyntacticMatches, 19 SemanticMatches, 188 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12356 ImplicationChecksByTransitivity, 27.4s TimeCoverageRelationStatistics Valid=1088, Invalid=34822, Unknown=0, NotChecked=0, Total=35910 [2020-10-23 21:53:00,291 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2020-10-23 21:53:00,327 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 142. [2020-10-23 21:53:00,327 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 142 states. [2020-10-23 21:53:00,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 146 transitions. [2020-10-23 21:53:00,329 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 146 transitions. Word has length 129 [2020-10-23 21:53:00,329 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 21:53:00,329 INFO L481 AbstractCegarLoop]: Abstraction has 142 states and 146 transitions. [2020-10-23 21:53:00,329 INFO L482 AbstractCegarLoop]: Interpolant automaton has 94 states. [2020-10-23 21:53:00,329 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 146 transitions. [2020-10-23 21:53:00,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2020-10-23 21:53:00,330 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 21:53:00,330 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 22, 22, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 21:53:00,330 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-10-23 21:53:00,331 INFO L429 AbstractCegarLoop]: === Iteration 24 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 21:53:00,331 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 21:53:00,331 INFO L82 PathProgramCache]: Analyzing trace with hash 904662193, now seen corresponding path program 21 times [2020-10-23 21:53:00,331 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 21:53:00,331 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1052955118] [2020-10-23 21:53:00,332 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 21:53:04,823 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:53:04,911 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:53:07,702 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 57 [2020-10-23 21:53:07,704 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-23 21:53:07,706 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:53:07,798 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:53:09,273 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 65 DAG size of output: 64 [2020-10-23 21:53:09,276 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:53:09,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:53:09,603 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 21:53:09,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:53:09,610 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 21:53:25,422 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1052955118] [2020-10-23 21:53:25,422 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 21:53:25,422 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [97] imperfect sequences [] total 97 [2020-10-23 21:53:25,423 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1665504955] [2020-10-23 21:53:25,423 INFO L461 AbstractCegarLoop]: Interpolant automaton has 98 states [2020-10-23 21:53:25,424 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 21:53:25,424 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2020-10-23 21:53:25,425 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=342, Invalid=9558, Unknown=0, NotChecked=0, Total=9900 [2020-10-23 21:53:25,425 INFO L87 Difference]: Start difference. First operand 142 states and 146 transitions. Second operand 98 states. [2020-10-23 21:53:51,232 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 35 DAG size of output: 32 [2020-10-23 21:53:52,879 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 21:53:52,879 INFO L93 Difference]: Finished difference Result 275 states and 284 transitions. [2020-10-23 21:53:52,889 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 101 states. [2020-10-23 21:53:52,889 INFO L78 Accepts]: Start accepts. Automaton has 98 states. Word has length 134 [2020-10-23 21:53:52,890 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 21:53:52,891 INFO L225 Difference]: With dead ends: 275 [2020-10-23 21:53:52,891 INFO L226 Difference]: Without dead ends: 151 [2020-10-23 21:53:52,896 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 224 GetRequests, 7 SyntacticMatches, 21 SemanticMatches, 196 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13480 ImplicationChecksByTransitivity, 31.8s TimeCoverageRelationStatistics Valid=1041, Invalid=37965, Unknown=0, NotChecked=0, Total=39006 [2020-10-23 21:53:52,897 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2020-10-23 21:53:52,931 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 147. [2020-10-23 21:53:52,931 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 147 states. [2020-10-23 21:53:52,932 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 151 transitions. [2020-10-23 21:53:52,933 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 151 transitions. Word has length 134 [2020-10-23 21:53:52,933 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 21:53:52,933 INFO L481 AbstractCegarLoop]: Abstraction has 147 states and 151 transitions. [2020-10-23 21:53:52,933 INFO L482 AbstractCegarLoop]: Interpolant automaton has 98 states. [2020-10-23 21:53:52,933 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 151 transitions. [2020-10-23 21:53:52,934 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2020-10-23 21:53:52,934 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 21:53:52,934 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 23, 23, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 21:53:52,935 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-10-23 21:53:52,935 INFO L429 AbstractCegarLoop]: === Iteration 25 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 21:53:52,935 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 21:53:52,935 INFO L82 PathProgramCache]: Analyzing trace with hash 1352863750, now seen corresponding path program 22 times [2020-10-23 21:53:52,936 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 21:53:52,936 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1531278900] [2020-10-23 21:53:52,936 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 21:53:57,453 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:53:57,570 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 32 [2020-10-23 21:53:57,572 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:54:01,491 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 57 [2020-10-23 21:54:01,494 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:54:01,601 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 32 [2020-10-23 21:54:01,603 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:54:02,432 WARN L193 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 65 DAG size of output: 64 [2020-10-23 21:54:02,435 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-23 21:54:02,437 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:54:02,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:54:02,680 WARN L193 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 20 [2020-10-23 21:54:02,833 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 15 [2020-10-23 21:54:02,924 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 21:54:02,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:54:02,931 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 21:54:22,345 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1531278900] [2020-10-23 21:54:22,345 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 21:54:22,346 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [101] imperfect sequences [] total 101 [2020-10-23 21:54:22,346 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [372784156] [2020-10-23 21:54:22,347 INFO L461 AbstractCegarLoop]: Interpolant automaton has 102 states [2020-10-23 21:54:22,347 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 21:54:22,348 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 102 interpolants. [2020-10-23 21:54:22,348 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=356, Invalid=10356, Unknown=0, NotChecked=0, Total=10712 [2020-10-23 21:54:22,349 INFO L87 Difference]: Start difference. First operand 147 states and 151 transitions. Second operand 102 states. [2020-10-23 21:54:54,493 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 35 DAG size of output: 32 [2020-10-23 21:54:54,780 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-10-23 21:54:55,568 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-10-23 21:54:56,612 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 21:54:56,612 INFO L93 Difference]: Finished difference Result 285 states and 294 transitions. [2020-10-23 21:54:56,615 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 105 states. [2020-10-23 21:54:56,616 INFO L78 Accepts]: Start accepts. Automaton has 102 states. Word has length 139 [2020-10-23 21:54:56,616 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 21:54:56,618 INFO L225 Difference]: With dead ends: 285 [2020-10-23 21:54:56,618 INFO L226 Difference]: Without dead ends: 156 [2020-10-23 21:54:56,621 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 233 GetRequests, 8 SyntacticMatches, 21 SemanticMatches, 204 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14630 ImplicationChecksByTransitivity, 39.0s TimeCoverageRelationStatistics Valid=1083, Invalid=41147, Unknown=0, NotChecked=0, Total=42230 [2020-10-23 21:54:56,621 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2020-10-23 21:54:56,653 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 152. [2020-10-23 21:54:56,653 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 152 states. [2020-10-23 21:54:56,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 156 transitions. [2020-10-23 21:54:56,654 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 156 transitions. Word has length 139 [2020-10-23 21:54:56,655 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 21:54:56,655 INFO L481 AbstractCegarLoop]: Abstraction has 152 states and 156 transitions. [2020-10-23 21:54:56,655 INFO L482 AbstractCegarLoop]: Interpolant automaton has 102 states. [2020-10-23 21:54:56,655 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 156 transitions. [2020-10-23 21:54:56,656 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2020-10-23 21:54:56,656 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 21:54:56,656 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 24, 24, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 21:54:56,656 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-10-23 21:54:56,656 INFO L429 AbstractCegarLoop]: === Iteration 26 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 21:54:56,657 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 21:54:56,657 INFO L82 PathProgramCache]: Analyzing trace with hash -1975855, now seen corresponding path program 23 times [2020-10-23 21:54:56,657 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 21:54:56,657 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [736282405] [2020-10-23 21:54:56,657 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 21:55:01,271 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:55:01,392 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 32 [2020-10-23 21:55:01,394 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:55:04,491 WARN L193 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 57 [2020-10-23 21:55:04,493 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-23 21:55:04,495 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:55:04,614 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 32 [2020-10-23 21:55:04,616 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:55:05,531 WARN L193 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 65 DAG size of output: 64 [2020-10-23 21:55:05,534 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-23 21:55:05,537 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:55:05,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:55:05,892 WARN L193 SmtUtils]: Spent 241.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 19 [2020-10-23 21:55:06,146 WARN L193 SmtUtils]: Spent 220.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 14 [2020-10-23 21:55:06,307 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 21:55:06,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:55:06,314 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 21:55:29,256 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [736282405] [2020-10-23 21:55:29,257 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 21:55:29,257 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [105] imperfect sequences [] total 105 [2020-10-23 21:55:29,258 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1567900918] [2020-10-23 21:55:29,258 INFO L461 AbstractCegarLoop]: Interpolant automaton has 106 states [2020-10-23 21:55:29,258 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 21:55:29,259 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 106 interpolants. [2020-10-23 21:55:29,260 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=370, Invalid=11186, Unknown=0, NotChecked=0, Total=11556 [2020-10-23 21:55:29,260 INFO L87 Difference]: Start difference. First operand 152 states and 156 transitions. Second operand 106 states. [2020-10-23 21:56:06,645 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2020-10-23 21:56:09,045 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 35 DAG size of output: 32 [2020-10-23 21:56:10,237 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-10-23 21:56:11,426 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 21:56:11,427 INFO L93 Difference]: Finished difference Result 295 states and 304 transitions. [2020-10-23 21:56:11,431 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 109 states. [2020-10-23 21:56:11,432 INFO L78 Accepts]: Start accepts. Automaton has 106 states. Word has length 144 [2020-10-23 21:56:11,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 21:56:11,434 INFO L225 Difference]: With dead ends: 295 [2020-10-23 21:56:11,434 INFO L226 Difference]: Without dead ends: 161 [2020-10-23 21:56:11,438 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 242 GetRequests, 7 SyntacticMatches, 23 SemanticMatches, 212 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15827 ImplicationChecksByTransitivity, 46.5s TimeCoverageRelationStatistics Valid=1125, Invalid=44457, Unknown=0, NotChecked=0, Total=45582 [2020-10-23 21:56:11,439 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 161 states. [2020-10-23 21:56:11,474 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 161 to 157. [2020-10-23 21:56:11,475 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 157 states. [2020-10-23 21:56:11,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 161 transitions. [2020-10-23 21:56:11,476 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 161 transitions. Word has length 144 [2020-10-23 21:56:11,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 21:56:11,476 INFO L481 AbstractCegarLoop]: Abstraction has 157 states and 161 transitions. [2020-10-23 21:56:11,476 INFO L482 AbstractCegarLoop]: Interpolant automaton has 106 states. [2020-10-23 21:56:11,477 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 161 transitions. [2020-10-23 21:56:11,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2020-10-23 21:56:11,477 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 21:56:11,477 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 25, 25, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 21:56:11,478 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-10-23 21:56:11,478 INFO L429 AbstractCegarLoop]: === Iteration 27 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 21:56:11,478 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 21:56:11,478 INFO L82 PathProgramCache]: Analyzing trace with hash 2145416934, now seen corresponding path program 24 times [2020-10-23 21:56:11,479 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 21:56:11,479 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1357776448] [2020-10-23 21:56:11,479 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 21:56:15,265 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:56:15,430 WARN L193 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 32 [2020-10-23 21:56:15,433 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:56:19,752 WARN L193 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 57 [2020-10-23 21:56:19,755 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-23 21:56:19,758 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:56:19,893 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 32 [2020-10-23 21:56:19,896 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:56:20,864 WARN L193 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 65 DAG size of output: 64 [2020-10-23 21:56:20,868 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-23 21:56:20,871 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:56:20,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:56:21,114 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 17 [2020-10-23 21:56:21,268 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 16 DAG size of output: 10 [2020-10-23 21:56:21,408 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 21:56:21,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:56:21,415 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 21:56:50,103 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1357776448] [2020-10-23 21:56:50,103 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 21:56:50,104 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [109] imperfect sequences [] total 109 [2020-10-23 21:56:50,104 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [411049300] [2020-10-23 21:56:50,105 INFO L461 AbstractCegarLoop]: Interpolant automaton has 110 states [2020-10-23 21:56:50,105 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 21:56:50,106 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 110 interpolants. [2020-10-23 21:56:50,107 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=384, Invalid=12048, Unknown=0, NotChecked=0, Total=12432 [2020-10-23 21:56:50,107 INFO L87 Difference]: Start difference. First operand 157 states and 161 transitions. Second operand 110 states. [2020-10-23 21:57:39,750 WARN L193 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 35 DAG size of output: 32 [2020-10-23 21:57:40,106 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-10-23 21:57:41,215 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 38 [2020-10-23 21:57:42,731 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 21:57:42,732 INFO L93 Difference]: Finished difference Result 305 states and 314 transitions. [2020-10-23 21:57:42,739 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 113 states. [2020-10-23 21:57:42,739 INFO L78 Accepts]: Start accepts. Automaton has 110 states. Word has length 149 [2020-10-23 21:57:42,740 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 21:57:42,741 INFO L225 Difference]: With dead ends: 305 [2020-10-23 21:57:42,742 INFO L226 Difference]: Without dead ends: 166 [2020-10-23 21:57:42,747 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 251 GetRequests, 8 SyntacticMatches, 23 SemanticMatches, 220 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17071 ImplicationChecksByTransitivity, 57.3s TimeCoverageRelationStatistics Valid=1167, Invalid=47895, Unknown=0, NotChecked=0, Total=49062 [2020-10-23 21:57:42,748 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2020-10-23 21:57:42,795 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 162. [2020-10-23 21:57:42,795 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 162 states. [2020-10-23 21:57:42,796 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 166 transitions. [2020-10-23 21:57:42,796 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 166 transitions. Word has length 149 [2020-10-23 21:57:42,796 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 21:57:42,797 INFO L481 AbstractCegarLoop]: Abstraction has 162 states and 166 transitions. [2020-10-23 21:57:42,797 INFO L482 AbstractCegarLoop]: Interpolant automaton has 110 states. [2020-10-23 21:57:42,797 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 166 transitions. [2020-10-23 21:57:42,797 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 155 [2020-10-23 21:57:42,797 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 21:57:42,798 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 26, 26, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 21:57:42,798 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-10-23 21:57:42,798 INFO L429 AbstractCegarLoop]: === Iteration 28 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 21:57:42,798 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 21:57:42,798 INFO L82 PathProgramCache]: Analyzing trace with hash 1532083953, now seen corresponding path program 25 times [2020-10-23 21:57:42,799 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 21:57:42,799 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1358788587] [2020-10-23 21:57:42,799 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 21:57:47,705 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-10-23 21:57:47,710 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:57:47,852 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 32 [2020-10-23 21:57:47,855 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:57:49,994 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-10-23 21:57:52,242 WARN L193 SmtUtils]: Spent 213.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 57 [2020-10-23 21:57:52,245 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-23 21:57:52,248 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:57:52,407 WARN L193 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 32 [2020-10-23 21:57:52,411 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:57:53,683 WARN L193 SmtUtils]: Spent 214.00 ms on a formula simplification. DAG size of input: 65 DAG size of output: 64 [2020-10-23 21:57:53,686 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-23 21:57:53,688 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:57:53,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:57:53,961 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 17 [2020-10-23 21:57:54,114 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 16 DAG size of output: 12 [2020-10-23 21:57:54,263 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 21:57:54,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:57:54,270 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 21:58:25,402 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1358788587] [2020-10-23 21:58:25,402 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 21:58:25,403 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [113] imperfect sequences [] total 113 [2020-10-23 21:58:25,403 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1316012388] [2020-10-23 21:58:25,404 INFO L461 AbstractCegarLoop]: Interpolant automaton has 114 states [2020-10-23 21:58:25,404 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 21:58:25,404 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 114 interpolants. [2020-10-23 21:58:25,405 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=398, Invalid=12942, Unknown=0, NotChecked=0, Total=13340 [2020-10-23 21:58:25,405 INFO L87 Difference]: Start difference. First operand 162 states and 166 transitions. Second operand 114 states. [2020-10-23 21:59:11,714 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 35 DAG size of output: 32 [2020-10-23 21:59:12,933 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-10-23 21:59:14,173 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 21:59:14,174 INFO L93 Difference]: Finished difference Result 315 states and 324 transitions. [2020-10-23 21:59:14,177 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 117 states. [2020-10-23 21:59:14,178 INFO L78 Accepts]: Start accepts. Automaton has 114 states. Word has length 154 [2020-10-23 21:59:14,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 21:59:14,180 INFO L225 Difference]: With dead ends: 315 [2020-10-23 21:59:14,180 INFO L226 Difference]: Without dead ends: 171 [2020-10-23 21:59:14,184 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 260 GetRequests, 7 SyntacticMatches, 25 SemanticMatches, 228 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18362 ImplicationChecksByTransitivity, 57.6s TimeCoverageRelationStatistics Valid=1209, Invalid=51461, Unknown=0, NotChecked=0, Total=52670 [2020-10-23 21:59:14,185 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 171 states. [2020-10-23 21:59:14,232 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 171 to 167. [2020-10-23 21:59:14,232 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 167 states. [2020-10-23 21:59:14,233 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 171 transitions. [2020-10-23 21:59:14,233 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 171 transitions. Word has length 154 [2020-10-23 21:59:14,233 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 21:59:14,234 INFO L481 AbstractCegarLoop]: Abstraction has 167 states and 171 transitions. [2020-10-23 21:59:14,234 INFO L482 AbstractCegarLoop]: Interpolant automaton has 114 states. [2020-10-23 21:59:14,234 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 171 transitions. [2020-10-23 21:59:14,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2020-10-23 21:59:14,235 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 21:59:14,235 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 27, 27, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 21:59:14,235 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-10-23 21:59:14,235 INFO L429 AbstractCegarLoop]: === Iteration 29 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 21:59:14,235 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 21:59:14,235 INFO L82 PathProgramCache]: Analyzing trace with hash -298662458, now seen corresponding path program 26 times [2020-10-23 21:59:14,236 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 21:59:14,236 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [422416365] [2020-10-23 21:59:14,236 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 21:59:19,042 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-10-23 21:59:19,046 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:59:19,183 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 32 [2020-10-23 21:59:19,185 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:59:21,310 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-10-23 21:59:22,228 WARN L193 SmtUtils]: Spent 186.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 57 [2020-10-23 21:59:22,231 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-23 21:59:22,233 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:59:22,376 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 32 [2020-10-23 21:59:22,378 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:59:24,268 WARN L193 SmtUtils]: Spent 194.00 ms on a formula simplification. DAG size of input: 65 DAG size of output: 64 [2020-10-23 21:59:24,271 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-23 21:59:24,273 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 21:59:24,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:59:24,593 WARN L193 SmtUtils]: Spent 209.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 20 [2020-10-23 21:59:24,798 WARN L193 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 15 [2020-10-23 21:59:24,931 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 21:59:24,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:59:24,937 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.