/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/locks/test_locks_11.c -------------------------------------------------------------------------------- This is Ultimate 0.2.0-b8ad66e [2020-10-23 20:30:39,653 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-23 20:30:39,656 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-23 20:30:39,692 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-10-23 20:30:39,706 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-23 20:30:39,707 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-23 20:30:39,711 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-23 20:30:39,713 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-23 20:30:39,716 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-23 20:30:39,717 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-23 20:30:39,732 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-23 20:30:39,735 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-23 20:30:39,737 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-23 20:30:39,740 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-23 20:30:39,743 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-23 20:30:39,744 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-23 20:30:39,749 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-10-23 20:30:39,769 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 20:30:39,792 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-23 20:30:39,792 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-23 20:30:39,797 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-23 20:30:39,797 INFO L138 SettingsManager]: * sizeof long=4 [2020-10-23 20:30:39,797 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-23 20:30:39,798 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-10-23 20:30:39,798 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-23 20:30:39,798 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-10-23 20:30:39,798 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-10-23 20:30:39,798 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-10-23 20:30:39,799 INFO L138 SettingsManager]: * sizeof long double=12 [2020-10-23 20:30:39,800 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-23 20:30:39,800 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-23 20:30:39,800 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-10-23 20:30:39,801 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-23 20:30:39,801 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-10-23 20:30:39,801 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-10-23 20:30:39,801 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-10-23 20:30:39,802 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-23 20:30:39,802 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-23 20:30:39,802 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-10-23 20:30:39,802 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-10-23 20:30:39,802 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-10-23 20:30:40,192 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-23 20:30:40,243 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-23 20:30:40,246 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-23 20:30:40,249 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-23 20:30:40,250 INFO L275 PluginConnector]: CDTParser initialized [2020-10-23 20:30:40,251 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/locks/test_locks_11.c [2020-10-23 20:30:40,332 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4cb2bf174/b0c3a7d605964c8eb9ec5c30b138df3f/FLAG53276c379 [2020-10-23 20:30:41,079 INFO L306 CDTParser]: Found 1 translation units. [2020-10-23 20:30:41,080 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/locks/test_locks_11.c [2020-10-23 20:30:41,092 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4cb2bf174/b0c3a7d605964c8eb9ec5c30b138df3f/FLAG53276c379 [2020-10-23 20:30:41,415 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4cb2bf174/b0c3a7d605964c8eb9ec5c30b138df3f [2020-10-23 20:30:41,418 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-23 20:30:41,431 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-10-23 20:30:41,435 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-23 20:30:41,435 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-23 20:30:41,439 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-23 20:30:41,440 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.10 08:30:41" (1/1) ... [2020-10-23 20:30:41,444 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6ec1e311 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 08:30:41, skipping insertion in model container [2020-10-23 20:30:41,444 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.10 08:30:41" (1/1) ... [2020-10-23 20:30:41,453 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-23 20:30:41,486 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-23 20:30:41,666 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-23 20:30:41,677 INFO L203 MainTranslator]: Completed pre-run [2020-10-23 20:30:41,730 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-23 20:30:41,761 INFO L208 MainTranslator]: Completed translation [2020-10-23 20:30:41,762 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 08:30:41 WrapperNode [2020-10-23 20:30:41,762 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-23 20:30:41,763 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-23 20:30:41,763 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-23 20:30:41,763 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-23 20:30:41,777 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 08:30:41" (1/1) ... [2020-10-23 20:30:41,777 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 08:30:41" (1/1) ... [2020-10-23 20:30:41,800 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 08:30:41" (1/1) ... [2020-10-23 20:30:41,801 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 08:30:41" (1/1) ... [2020-10-23 20:30:41,821 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 08:30:41" (1/1) ... [2020-10-23 20:30:41,841 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 08:30:41" (1/1) ... [2020-10-23 20:30:41,843 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 08:30:41" (1/1) ... [2020-10-23 20:30:41,852 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-23 20:30:41,854 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-23 20:30:41,854 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-23 20:30:41,854 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-23 20:30:41,858 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 08:30:41" (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 20:30:41,959 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-10-23 20:30:41,959 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-23 20:30:41,960 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2020-10-23 20:30:41,960 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-10-23 20:30:41,961 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-10-23 20:30:41,961 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2020-10-23 20:30:41,961 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2020-10-23 20:30:41,961 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-10-23 20:30:41,962 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-10-23 20:30:41,962 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-10-23 20:30:41,963 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-10-23 20:30:41,963 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-10-23 20:30:41,963 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-23 20:30:41,963 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-10-23 20:30:41,964 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-10-23 20:30:41,964 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-10-23 20:30:42,696 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-23 20:30:42,696 INFO L298 CfgBuilder]: Removed 1 assume(true) statements. [2020-10-23 20:30:42,698 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.10 08:30:42 BoogieIcfgContainer [2020-10-23 20:30:42,698 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-23 20:30:42,700 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-10-23 20:30:42,700 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-10-23 20:30:42,709 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-10-23 20:30:42,709 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.10 08:30:41" (1/3) ... [2020-10-23 20:30:42,710 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@77c7371d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.10 08:30:42, skipping insertion in model container [2020-10-23 20:30:42,710 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 08:30:41" (2/3) ... [2020-10-23 20:30:42,711 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@77c7371d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.10 08:30:42, skipping insertion in model container [2020-10-23 20:30:42,711 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.10 08:30:42" (3/3) ... [2020-10-23 20:30:42,712 INFO L111 eAbstractionObserver]: Analyzing ICFG test_locks_11.c [2020-10-23 20:30:42,723 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-10-23 20:30:42,727 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-10-23 20:30:42,737 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-10-23 20:30:42,760 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-10-23 20:30:42,760 INFO L378 AbstractCegarLoop]: Hoare is true [2020-10-23 20:30:42,760 INFO L379 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2020-10-23 20:30:42,760 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-23 20:30:42,760 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-23 20:30:42,760 INFO L382 AbstractCegarLoop]: Difference is false [2020-10-23 20:30:42,761 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-23 20:30:42,761 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-10-23 20:30:42,778 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states. [2020-10-23 20:30:42,791 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2020-10-23 20:30:42,792 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 20:30:42,792 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 20:30:42,793 INFO L429 AbstractCegarLoop]: === Iteration 1 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 20:30:42,799 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 20:30:42,800 INFO L82 PathProgramCache]: Analyzing trace with hash -29840839, now seen corresponding path program 1 times [2020-10-23 20:30:42,809 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 20:30:42,810 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1309967691] [2020-10-23 20:30:42,810 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 20:30:42,878 INFO L321 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-10-23 20:30:42,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 20:30:43,178 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 20:30:43,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 20:30:43,221 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 20:30:43,223 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1309967691] [2020-10-23 20:30:43,225 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 20:30:43,225 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-10-23 20:30:43,226 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2125874469] [2020-10-23 20:30:43,231 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-23 20:30:43,231 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 20:30:43,244 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-23 20:30:43,245 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-23 20:30:43,247 INFO L87 Difference]: Start difference. First operand 140 states. Second operand 4 states. [2020-10-23 20:30:43,832 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 20:30:43,832 INFO L93 Difference]: Finished difference Result 291 states and 398 transitions. [2020-10-23 20:30:43,833 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-10-23 20:30:43,835 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 88 [2020-10-23 20:30:43,836 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 20:30:43,849 INFO L225 Difference]: With dead ends: 291 [2020-10-23 20:30:43,850 INFO L226 Difference]: Without dead ends: 200 [2020-10-23 20:30:43,854 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-10-23 20:30:43,873 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 200 states. [2020-10-23 20:30:43,952 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 200 to 199. [2020-10-23 20:30:43,954 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 199 states. [2020-10-23 20:30:43,957 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 199 states to 199 states and 261 transitions. [2020-10-23 20:30:43,959 INFO L78 Accepts]: Start accepts. Automaton has 199 states and 261 transitions. Word has length 88 [2020-10-23 20:30:43,959 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 20:30:43,960 INFO L481 AbstractCegarLoop]: Abstraction has 199 states and 261 transitions. [2020-10-23 20:30:43,960 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-23 20:30:43,960 INFO L276 IsEmpty]: Start isEmpty. Operand 199 states and 261 transitions. [2020-10-23 20:30:43,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2020-10-23 20:30:43,964 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 20:30:43,964 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 20:30:43,965 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-10-23 20:30:43,965 INFO L429 AbstractCegarLoop]: === Iteration 2 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 20:30:43,966 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 20:30:43,966 INFO L82 PathProgramCache]: Analyzing trace with hash -282351705, now seen corresponding path program 1 times [2020-10-23 20:30:43,966 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 20:30:43,966 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2087372927] [2020-10-23 20:30:43,967 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 20:30:43,970 INFO L321 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-10-23 20:30:44,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 20:30:44,094 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 20:30:44,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 20:30:44,116 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 20:30:44,116 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2087372927] [2020-10-23 20:30:44,117 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 20:30:44,117 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-10-23 20:30:44,117 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [778744271] [2020-10-23 20:30:44,118 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-23 20:30:44,118 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 20:30:44,119 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-23 20:30:44,120 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-23 20:30:44,120 INFO L87 Difference]: Start difference. First operand 199 states and 261 transitions. Second operand 4 states. [2020-10-23 20:30:44,543 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 20:30:44,544 INFO L93 Difference]: Finished difference Result 239 states and 320 transitions. [2020-10-23 20:30:44,544 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-10-23 20:30:44,544 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 89 [2020-10-23 20:30:44,545 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 20:30:44,547 INFO L225 Difference]: With dead ends: 239 [2020-10-23 20:30:44,548 INFO L226 Difference]: Without dead ends: 236 [2020-10-23 20:30:44,549 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-10-23 20:30:44,550 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 236 states. [2020-10-23 20:30:44,592 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 236 to 199. [2020-10-23 20:30:44,593 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 199 states. [2020-10-23 20:30:44,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 199 states to 199 states and 260 transitions. [2020-10-23 20:30:44,595 INFO L78 Accepts]: Start accepts. Automaton has 199 states and 260 transitions. Word has length 89 [2020-10-23 20:30:44,595 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 20:30:44,596 INFO L481 AbstractCegarLoop]: Abstraction has 199 states and 260 transitions. [2020-10-23 20:30:44,596 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-23 20:30:44,596 INFO L276 IsEmpty]: Start isEmpty. Operand 199 states and 260 transitions. [2020-10-23 20:30:44,599 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2020-10-23 20:30:44,599 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 20:30:44,600 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 20:30:44,600 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-10-23 20:30:44,600 INFO L429 AbstractCegarLoop]: === Iteration 3 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 20:30:44,601 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 20:30:44,601 INFO L82 PathProgramCache]: Analyzing trace with hash -917522190, now seen corresponding path program 1 times [2020-10-23 20:30:44,601 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 20:30:44,601 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1158386397] [2020-10-23 20:30:44,602 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 20:30:44,604 INFO L321 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-10-23 20:30:44,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 20:30:44,738 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 20:30:44,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 20:30:44,755 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 20:30:44,756 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1158386397] [2020-10-23 20:30:44,756 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 20:30:44,756 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-10-23 20:30:44,757 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [249382930] [2020-10-23 20:30:44,757 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-23 20:30:44,757 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 20:30:44,758 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-23 20:30:44,758 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-23 20:30:44,759 INFO L87 Difference]: Start difference. First operand 199 states and 260 transitions. Second operand 4 states. [2020-10-23 20:30:45,188 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 20:30:45,188 INFO L93 Difference]: Finished difference Result 475 states and 657 transitions. [2020-10-23 20:30:45,189 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-10-23 20:30:45,189 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 89 [2020-10-23 20:30:45,190 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 20:30:45,192 INFO L225 Difference]: With dead ends: 475 [2020-10-23 20:30:45,192 INFO L226 Difference]: Without dead ends: 333 [2020-10-23 20:30:45,194 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-10-23 20:30:45,195 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 333 states. [2020-10-23 20:30:45,255 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 333 to 332. [2020-10-23 20:30:45,255 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 332 states. [2020-10-23 20:30:45,257 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 332 states to 332 states and 449 transitions. [2020-10-23 20:30:45,257 INFO L78 Accepts]: Start accepts. Automaton has 332 states and 449 transitions. Word has length 89 [2020-10-23 20:30:45,258 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 20:30:45,258 INFO L481 AbstractCegarLoop]: Abstraction has 332 states and 449 transitions. [2020-10-23 20:30:45,258 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-23 20:30:45,258 INFO L276 IsEmpty]: Start isEmpty. Operand 332 states and 449 transitions. [2020-10-23 20:30:45,260 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2020-10-23 20:30:45,261 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 20:30:45,261 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 20:30:45,261 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-10-23 20:30:45,261 INFO L429 AbstractCegarLoop]: === Iteration 4 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 20:30:45,262 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 20:30:45,262 INFO L82 PathProgramCache]: Analyzing trace with hash 2121163263, now seen corresponding path program 1 times [2020-10-23 20:30:45,262 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 20:30:45,263 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [968240785] [2020-10-23 20:30:45,263 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 20:30:45,265 INFO L321 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-10-23 20:30:45,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 20:30:45,349 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 20:30:45,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 20:30:45,363 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 20:30:45,363 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [968240785] [2020-10-23 20:30:45,363 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 20:30:45,364 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-10-23 20:30:45,364 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [876688139] [2020-10-23 20:30:45,364 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-23 20:30:45,365 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 20:30:45,365 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-23 20:30:45,366 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-23 20:30:45,366 INFO L87 Difference]: Start difference. First operand 332 states and 449 transitions. Second operand 4 states. [2020-10-23 20:30:45,768 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 20:30:45,769 INFO L93 Difference]: Finished difference Result 404 states and 556 transitions. [2020-10-23 20:30:45,769 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-10-23 20:30:45,770 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 90 [2020-10-23 20:30:45,770 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 20:30:45,772 INFO L225 Difference]: With dead ends: 404 [2020-10-23 20:30:45,773 INFO L226 Difference]: Without dead ends: 401 [2020-10-23 20:30:45,773 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-10-23 20:30:45,774 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 401 states. [2020-10-23 20:30:45,827 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 401 to 332. [2020-10-23 20:30:45,827 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 332 states. [2020-10-23 20:30:45,829 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 332 states to 332 states and 447 transitions. [2020-10-23 20:30:45,829 INFO L78 Accepts]: Start accepts. Automaton has 332 states and 447 transitions. Word has length 90 [2020-10-23 20:30:45,830 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 20:30:45,830 INFO L481 AbstractCegarLoop]: Abstraction has 332 states and 447 transitions. [2020-10-23 20:30:45,830 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-23 20:30:45,830 INFO L276 IsEmpty]: Start isEmpty. Operand 332 states and 447 transitions. [2020-10-23 20:30:45,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2020-10-23 20:30:45,832 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 20:30:45,832 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 20:30:45,832 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-10-23 20:30:45,832 INFO L429 AbstractCegarLoop]: === Iteration 5 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 20:30:45,833 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 20:30:45,833 INFO L82 PathProgramCache]: Analyzing trace with hash 1629138533, now seen corresponding path program 1 times [2020-10-23 20:30:45,833 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 20:30:45,834 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1138766635] [2020-10-23 20:30:45,834 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 20:30:45,836 INFO L321 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-10-23 20:30:45,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 20:30:45,926 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 20:30:45,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 20:30:45,947 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 20:30:45,947 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1138766635] [2020-10-23 20:30:45,948 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 20:30:45,948 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-10-23 20:30:45,948 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [587926758] [2020-10-23 20:30:45,949 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-23 20:30:45,950 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 20:30:45,950 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-23 20:30:45,950 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-23 20:30:45,951 INFO L87 Difference]: Start difference. First operand 332 states and 447 transitions. Second operand 4 states. [2020-10-23 20:30:46,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 20:30:46,419 INFO L93 Difference]: Finished difference Result 868 states and 1210 transitions. [2020-10-23 20:30:46,420 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-10-23 20:30:46,420 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 90 [2020-10-23 20:30:46,421 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 20:30:46,424 INFO L225 Difference]: With dead ends: 868 [2020-10-23 20:30:46,424 INFO L226 Difference]: Without dead ends: 593 [2020-10-23 20:30:46,427 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-10-23 20:30:46,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 593 states. [2020-10-23 20:30:46,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 593 to 592. [2020-10-23 20:30:46,519 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 592 states. [2020-10-23 20:30:46,522 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 592 states to 592 states and 811 transitions. [2020-10-23 20:30:46,522 INFO L78 Accepts]: Start accepts. Automaton has 592 states and 811 transitions. Word has length 90 [2020-10-23 20:30:46,522 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 20:30:46,523 INFO L481 AbstractCegarLoop]: Abstraction has 592 states and 811 transitions. [2020-10-23 20:30:46,523 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-23 20:30:46,523 INFO L276 IsEmpty]: Start isEmpty. Operand 592 states and 811 transitions. [2020-10-23 20:30:46,524 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2020-10-23 20:30:46,525 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 20:30:46,525 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 20:30:46,525 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-10-23 20:30:46,525 INFO L429 AbstractCegarLoop]: === Iteration 6 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 20:30:46,526 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 20:30:46,526 INFO L82 PathProgramCache]: Analyzing trace with hash -679272525, now seen corresponding path program 1 times [2020-10-23 20:30:46,526 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 20:30:46,526 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [627365858] [2020-10-23 20:30:46,527 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 20:30:46,529 INFO L321 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-10-23 20:30:46,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 20:30:46,595 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 20:30:46,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 20:30:46,608 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 20:30:46,608 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [627365858] [2020-10-23 20:30:46,608 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 20:30:46,609 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-10-23 20:30:46,609 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [971616667] [2020-10-23 20:30:46,609 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-23 20:30:46,609 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 20:30:46,610 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-23 20:30:46,610 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-23 20:30:46,610 INFO L87 Difference]: Start difference. First operand 592 states and 811 transitions. Second operand 4 states. [2020-10-23 20:30:47,048 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 20:30:47,048 INFO L93 Difference]: Finished difference Result 724 states and 1006 transitions. [2020-10-23 20:30:47,049 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-10-23 20:30:47,049 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 91 [2020-10-23 20:30:47,049 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 20:30:47,053 INFO L225 Difference]: With dead ends: 724 [2020-10-23 20:30:47,054 INFO L226 Difference]: Without dead ends: 721 [2020-10-23 20:30:47,054 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-10-23 20:30:47,056 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 721 states. [2020-10-23 20:30:47,128 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 721 to 592. [2020-10-23 20:30:47,129 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 592 states. [2020-10-23 20:30:47,132 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 592 states to 592 states and 807 transitions. [2020-10-23 20:30:47,132 INFO L78 Accepts]: Start accepts. Automaton has 592 states and 807 transitions. Word has length 91 [2020-10-23 20:30:47,133 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 20:30:47,133 INFO L481 AbstractCegarLoop]: Abstraction has 592 states and 807 transitions. [2020-10-23 20:30:47,133 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-23 20:30:47,133 INFO L276 IsEmpty]: Start isEmpty. Operand 592 states and 807 transitions. [2020-10-23 20:30:47,134 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2020-10-23 20:30:47,134 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 20:30:47,135 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 20:30:47,135 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-10-23 20:30:47,135 INFO L429 AbstractCegarLoop]: === Iteration 7 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 20:30:47,136 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 20:30:47,136 INFO L82 PathProgramCache]: Analyzing trace with hash -1028746146, now seen corresponding path program 1 times [2020-10-23 20:30:47,136 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 20:30:47,136 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1495874993] [2020-10-23 20:30:47,136 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 20:30:47,138 INFO L321 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-10-23 20:30:47,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 20:30:47,193 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 20:30:47,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 20:30:47,206 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 20:30:47,206 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1495874993] [2020-10-23 20:30:47,207 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 20:30:47,207 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-10-23 20:30:47,207 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1762723229] [2020-10-23 20:30:47,207 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-23 20:30:47,208 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 20:30:47,208 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-23 20:30:47,208 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-23 20:30:47,209 INFO L87 Difference]: Start difference. First operand 592 states and 807 transitions. Second operand 4 states. [2020-10-23 20:30:47,712 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 20:30:47,712 INFO L93 Difference]: Finished difference Result 1636 states and 2274 transitions. [2020-10-23 20:30:47,712 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-10-23 20:30:47,713 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 91 [2020-10-23 20:30:47,713 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 20:30:47,719 INFO L225 Difference]: With dead ends: 1636 [2020-10-23 20:30:47,719 INFO L226 Difference]: Without dead ends: 1101 [2020-10-23 20:30:47,721 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-10-23 20:30:47,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1101 states. [2020-10-23 20:30:47,879 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1101 to 1100. [2020-10-23 20:30:47,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1100 states. [2020-10-23 20:30:47,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1100 states to 1100 states and 1507 transitions. [2020-10-23 20:30:47,886 INFO L78 Accepts]: Start accepts. Automaton has 1100 states and 1507 transitions. Word has length 91 [2020-10-23 20:30:47,886 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 20:30:47,886 INFO L481 AbstractCegarLoop]: Abstraction has 1100 states and 1507 transitions. [2020-10-23 20:30:47,886 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-23 20:30:47,886 INFO L276 IsEmpty]: Start isEmpty. Operand 1100 states and 1507 transitions. [2020-10-23 20:30:47,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-10-23 20:30:47,888 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 20:30:47,888 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 20:30:47,888 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-10-23 20:30:47,889 INFO L429 AbstractCegarLoop]: === Iteration 8 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 20:30:47,889 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 20:30:47,889 INFO L82 PathProgramCache]: Analyzing trace with hash -1818781039, now seen corresponding path program 1 times [2020-10-23 20:30:47,890 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 20:30:47,890 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1439115879] [2020-10-23 20:30:47,890 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 20:30:47,892 INFO L321 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-10-23 20:30:47,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 20:30:47,945 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 20:30:47,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 20:30:47,957 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 20:30:47,958 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1439115879] [2020-10-23 20:30:47,958 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 20:30:47,958 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-10-23 20:30:47,958 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1876275066] [2020-10-23 20:30:47,959 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-23 20:30:47,959 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 20:30:47,960 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-23 20:30:47,960 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-23 20:30:47,960 INFO L87 Difference]: Start difference. First operand 1100 states and 1507 transitions. Second operand 4 states. [2020-10-23 20:30:48,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 20:30:48,735 INFO L93 Difference]: Finished difference Result 3136 states and 4342 transitions. [2020-10-23 20:30:48,736 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-10-23 20:30:48,736 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 92 [2020-10-23 20:30:48,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 20:30:48,748 INFO L225 Difference]: With dead ends: 3136 [2020-10-23 20:30:48,749 INFO L226 Difference]: Without dead ends: 2093 [2020-10-23 20:30:48,752 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-10-23 20:30:48,755 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2093 states. [2020-10-23 20:30:49,065 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2093 to 2092. [2020-10-23 20:30:49,065 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2092 states. [2020-10-23 20:30:49,075 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2092 states to 2092 states and 2859 transitions. [2020-10-23 20:30:49,076 INFO L78 Accepts]: Start accepts. Automaton has 2092 states and 2859 transitions. Word has length 92 [2020-10-23 20:30:49,076 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 20:30:49,076 INFO L481 AbstractCegarLoop]: Abstraction has 2092 states and 2859 transitions. [2020-10-23 20:30:49,076 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-23 20:30:49,076 INFO L276 IsEmpty]: Start isEmpty. Operand 2092 states and 2859 transitions. [2020-10-23 20:30:49,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-10-23 20:30:49,079 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 20:30:49,079 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 20:30:49,079 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-10-23 20:30:49,079 INFO L429 AbstractCegarLoop]: === Iteration 9 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 20:30:49,080 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 20:30:49,080 INFO L82 PathProgramCache]: Analyzing trace with hash -1593424501, now seen corresponding path program 1 times [2020-10-23 20:30:49,080 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 20:30:49,081 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2118091074] [2020-10-23 20:30:49,081 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 20:30:49,083 INFO L321 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-10-23 20:30:49,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 20:30:49,136 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 20:30:49,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 20:30:49,148 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 20:30:49,148 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2118091074] [2020-10-23 20:30:49,148 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 20:30:49,149 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-10-23 20:30:49,149 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [204136809] [2020-10-23 20:30:49,149 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-23 20:30:49,149 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 20:30:49,150 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-23 20:30:49,150 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-23 20:30:49,150 INFO L87 Difference]: Start difference. First operand 2092 states and 2859 transitions. Second operand 4 states. [2020-10-23 20:30:50,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 20:30:50,009 INFO L93 Difference]: Finished difference Result 2560 states and 3534 transitions. [2020-10-23 20:30:50,010 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-10-23 20:30:50,010 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 92 [2020-10-23 20:30:50,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 20:30:50,023 INFO L225 Difference]: With dead ends: 2560 [2020-10-23 20:30:50,024 INFO L226 Difference]: Without dead ends: 2557 [2020-10-23 20:30:50,025 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-10-23 20:30:50,029 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2557 states. [2020-10-23 20:30:50,352 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2557 to 2092. [2020-10-23 20:30:50,355 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2092 states. [2020-10-23 20:30:50,365 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2092 states to 2092 states and 2843 transitions. [2020-10-23 20:30:50,366 INFO L78 Accepts]: Start accepts. Automaton has 2092 states and 2843 transitions. Word has length 92 [2020-10-23 20:30:50,366 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 20:30:50,368 INFO L481 AbstractCegarLoop]: Abstraction has 2092 states and 2843 transitions. [2020-10-23 20:30:50,368 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-23 20:30:50,369 INFO L276 IsEmpty]: Start isEmpty. Operand 2092 states and 2843 transitions. [2020-10-23 20:30:50,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2020-10-23 20:30:50,371 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 20:30:50,371 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 20:30:50,371 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-10-23 20:30:50,372 INFO L429 AbstractCegarLoop]: === Iteration 10 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 20:30:50,372 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 20:30:50,372 INFO L82 PathProgramCache]: Analyzing trace with hash 132646847, now seen corresponding path program 1 times [2020-10-23 20:30:50,372 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 20:30:50,373 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [301097844] [2020-10-23 20:30:50,373 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 20:30:50,375 INFO L321 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-10-23 20:30:50,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 20:30:50,441 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 20:30:50,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 20:30:50,453 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 20:30:50,453 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [301097844] [2020-10-23 20:30:50,453 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 20:30:50,454 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-10-23 20:30:50,454 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1866619780] [2020-10-23 20:30:50,454 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-23 20:30:50,454 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 20:30:50,455 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-23 20:30:50,455 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-23 20:30:50,455 INFO L87 Difference]: Start difference. First operand 2092 states and 2843 transitions. Second operand 4 states. [2020-10-23 20:30:51,237 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 20:30:51,238 INFO L93 Difference]: Finished difference Result 2544 states and 3486 transitions. [2020-10-23 20:30:51,238 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-10-23 20:30:51,238 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 93 [2020-10-23 20:30:51,239 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 20:30:51,252 INFO L225 Difference]: With dead ends: 2544 [2020-10-23 20:30:51,252 INFO L226 Difference]: Without dead ends: 2541 [2020-10-23 20:30:51,254 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-10-23 20:30:51,258 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2541 states. [2020-10-23 20:30:51,585 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2541 to 2092. [2020-10-23 20:30:51,585 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2092 states. [2020-10-23 20:30:51,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2092 states to 2092 states and 2827 transitions. [2020-10-23 20:30:51,594 INFO L78 Accepts]: Start accepts. Automaton has 2092 states and 2827 transitions. Word has length 93 [2020-10-23 20:30:51,594 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 20:30:51,594 INFO L481 AbstractCegarLoop]: Abstraction has 2092 states and 2827 transitions. [2020-10-23 20:30:51,594 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-23 20:30:51,595 INFO L276 IsEmpty]: Start isEmpty. Operand 2092 states and 2827 transitions. [2020-10-23 20:30:51,597 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2020-10-23 20:30:51,597 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 20:30:51,597 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 20:30:51,597 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-10-23 20:30:51,597 INFO L429 AbstractCegarLoop]: === Iteration 11 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 20:30:51,598 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 20:30:51,598 INFO L82 PathProgramCache]: Analyzing trace with hash -540047414, now seen corresponding path program 1 times [2020-10-23 20:30:51,598 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 20:30:51,599 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [531506972] [2020-10-23 20:30:51,599 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 20:30:51,600 INFO L321 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-10-23 20:30:51,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 20:30:51,653 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 20:30:51,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 20:30:51,665 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 20:30:51,666 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [531506972] [2020-10-23 20:30:51,666 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 20:30:51,666 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-10-23 20:30:51,666 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1809445985] [2020-10-23 20:30:51,667 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-23 20:30:51,667 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 20:30:51,668 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-23 20:30:51,668 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-23 20:30:51,668 INFO L87 Difference]: Start difference. First operand 2092 states and 2827 transitions. Second operand 4 states. [2020-10-23 20:30:52,724 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 20:30:52,724 INFO L93 Difference]: Finished difference Result 6064 states and 8238 transitions. [2020-10-23 20:30:52,725 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-10-23 20:30:52,725 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 93 [2020-10-23 20:30:52,725 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 20:30:52,746 INFO L225 Difference]: With dead ends: 6064 [2020-10-23 20:30:52,746 INFO L226 Difference]: Without dead ends: 4029 [2020-10-23 20:30:52,753 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-10-23 20:30:52,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4029 states. [2020-10-23 20:30:53,438 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4029 to 4028. [2020-10-23 20:30:53,438 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4028 states. [2020-10-23 20:30:53,454 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4028 states to 4028 states and 5403 transitions. [2020-10-23 20:30:53,454 INFO L78 Accepts]: Start accepts. Automaton has 4028 states and 5403 transitions. Word has length 93 [2020-10-23 20:30:53,454 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 20:30:53,455 INFO L481 AbstractCegarLoop]: Abstraction has 4028 states and 5403 transitions. [2020-10-23 20:30:53,455 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-23 20:30:53,455 INFO L276 IsEmpty]: Start isEmpty. Operand 4028 states and 5403 transitions. [2020-10-23 20:30:53,459 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2020-10-23 20:30:53,459 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 20:30:53,460 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 20:30:53,460 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-10-23 20:30:53,460 INFO L429 AbstractCegarLoop]: === Iteration 12 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 20:30:53,460 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 20:30:53,461 INFO L82 PathProgramCache]: Analyzing trace with hash 446000829, now seen corresponding path program 1 times [2020-10-23 20:30:53,461 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 20:30:53,461 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1058646065] [2020-10-23 20:30:53,461 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 20:30:53,464 INFO L321 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-10-23 20:30:53,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 20:30:53,521 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 20:30:53,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 20:30:53,537 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 20:30:53,538 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1058646065] [2020-10-23 20:30:53,538 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 20:30:53,538 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-10-23 20:30:53,539 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [413621207] [2020-10-23 20:30:53,539 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-23 20:30:53,539 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 20:30:53,540 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-23 20:30:53,540 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-23 20:30:53,540 INFO L87 Difference]: Start difference. First operand 4028 states and 5403 transitions. Second operand 4 states. [2020-10-23 20:30:54,881 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 20:30:54,882 INFO L93 Difference]: Finished difference Result 11776 states and 15838 transitions. [2020-10-23 20:30:54,882 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-10-23 20:30:54,882 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 94 [2020-10-23 20:30:54,882 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 20:30:54,919 INFO L225 Difference]: With dead ends: 11776 [2020-10-23 20:30:54,920 INFO L226 Difference]: Without dead ends: 7805 [2020-10-23 20:30:54,930 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-10-23 20:30:54,939 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7805 states. [2020-10-23 20:30:55,987 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7805 to 7804. [2020-10-23 20:30:55,988 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7804 states. [2020-10-23 20:30:56,003 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7804 states to 7804 states and 10363 transitions. [2020-10-23 20:30:56,004 INFO L78 Accepts]: Start accepts. Automaton has 7804 states and 10363 transitions. Word has length 94 [2020-10-23 20:30:56,004 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 20:30:56,005 INFO L481 AbstractCegarLoop]: Abstraction has 7804 states and 10363 transitions. [2020-10-23 20:30:56,005 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-23 20:30:56,005 INFO L276 IsEmpty]: Start isEmpty. Operand 7804 states and 10363 transitions. [2020-10-23 20:30:56,011 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2020-10-23 20:30:56,011 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 20:30:56,012 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 20:30:56,012 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-10-23 20:30:56,012 INFO L429 AbstractCegarLoop]: === Iteration 13 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 20:30:56,012 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 20:30:56,013 INFO L82 PathProgramCache]: Analyzing trace with hash 2101262615, now seen corresponding path program 1 times [2020-10-23 20:30:56,013 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 20:30:56,013 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [344337668] [2020-10-23 20:30:56,013 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 20:30:56,015 INFO L321 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-10-23 20:30:56,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 20:30:56,076 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 20:30:56,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 20:30:56,088 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 20:30:56,088 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [344337668] [2020-10-23 20:30:56,088 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 20:30:56,089 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-10-23 20:30:56,089 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [43970877] [2020-10-23 20:30:56,089 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-23 20:30:56,089 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 20:30:56,090 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-23 20:30:56,090 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-23 20:30:56,090 INFO L87 Difference]: Start difference. First operand 7804 states and 10363 transitions. Second operand 4 states. [2020-10-23 20:30:57,751 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 20:30:57,751 INFO L93 Difference]: Finished difference Result 9408 states and 12542 transitions. [2020-10-23 20:30:57,751 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-10-23 20:30:57,752 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 94 [2020-10-23 20:30:57,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 20:30:57,793 INFO L225 Difference]: With dead ends: 9408 [2020-10-23 20:30:57,793 INFO L226 Difference]: Without dead ends: 9405 [2020-10-23 20:30:57,797 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-10-23 20:30:57,807 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9405 states. [2020-10-23 20:30:58,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9405 to 7804. [2020-10-23 20:30:58,755 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7804 states. [2020-10-23 20:30:58,771 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7804 states to 7804 states and 10299 transitions. [2020-10-23 20:30:58,772 INFO L78 Accepts]: Start accepts. Automaton has 7804 states and 10299 transitions. Word has length 94 [2020-10-23 20:30:58,772 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 20:30:58,772 INFO L481 AbstractCegarLoop]: Abstraction has 7804 states and 10299 transitions. [2020-10-23 20:30:58,772 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-23 20:30:58,772 INFO L276 IsEmpty]: Start isEmpty. Operand 7804 states and 10299 transitions. [2020-10-23 20:30:58,779 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2020-10-23 20:30:58,779 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 20:30:58,779 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 20:30:58,780 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-10-23 20:30:58,780 INFO L429 AbstractCegarLoop]: === Iteration 14 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 20:30:58,780 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 20:30:58,780 INFO L82 PathProgramCache]: Analyzing trace with hash -1296146485, now seen corresponding path program 1 times [2020-10-23 20:30:58,781 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 20:30:58,781 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [17291702] [2020-10-23 20:30:58,781 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 20:30:58,783 INFO L321 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-10-23 20:30:58,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 20:30:58,837 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 20:30:58,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 20:30:58,848 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 20:30:58,849 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [17291702] [2020-10-23 20:30:58,849 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 20:30:58,849 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-10-23 20:30:58,849 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [293058082] [2020-10-23 20:30:58,850 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-23 20:30:58,850 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 20:30:58,851 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-23 20:30:58,851 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-23 20:30:58,851 INFO L87 Difference]: Start difference. First operand 7804 states and 10299 transitions. Second operand 4 states. [2020-10-23 20:31:00,126 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 20:31:00,126 INFO L93 Difference]: Finished difference Result 9344 states and 12350 transitions. [2020-10-23 20:31:00,127 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-10-23 20:31:00,127 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 95 [2020-10-23 20:31:00,127 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 20:31:00,149 INFO L225 Difference]: With dead ends: 9344 [2020-10-23 20:31:00,150 INFO L226 Difference]: Without dead ends: 9341 [2020-10-23 20:31:00,154 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-10-23 20:31:00,164 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9341 states. [2020-10-23 20:31:01,258 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9341 to 7804. [2020-10-23 20:31:01,258 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7804 states. [2020-10-23 20:31:01,272 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7804 states to 7804 states and 10235 transitions. [2020-10-23 20:31:01,272 INFO L78 Accepts]: Start accepts. Automaton has 7804 states and 10235 transitions. Word has length 95 [2020-10-23 20:31:01,273 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 20:31:01,273 INFO L481 AbstractCegarLoop]: Abstraction has 7804 states and 10235 transitions. [2020-10-23 20:31:01,273 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-23 20:31:01,273 INFO L276 IsEmpty]: Start isEmpty. Operand 7804 states and 10235 transitions. [2020-10-23 20:31:01,280 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2020-10-23 20:31:01,280 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 20:31:01,280 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 20:31:01,280 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-10-23 20:31:01,280 INFO L429 AbstractCegarLoop]: === Iteration 15 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 20:31:01,281 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 20:31:01,281 INFO L82 PathProgramCache]: Analyzing trace with hash 948736822, now seen corresponding path program 1 times [2020-10-23 20:31:01,281 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 20:31:01,281 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1940008555] [2020-10-23 20:31:01,282 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 20:31:01,283 INFO L321 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-10-23 20:31:01,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 20:31:01,341 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 20:31:01,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 20:31:01,358 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 20:31:01,359 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1940008555] [2020-10-23 20:31:01,359 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 20:31:01,360 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-10-23 20:31:01,360 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [877504831] [2020-10-23 20:31:01,360 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-23 20:31:01,360 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 20:31:01,361 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-23 20:31:01,361 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-23 20:31:01,361 INFO L87 Difference]: Start difference. First operand 7804 states and 10235 transitions. Second operand 4 states. [2020-10-23 20:31:03,565 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 20:31:03,565 INFO L93 Difference]: Finished difference Result 22912 states and 30078 transitions. [2020-10-23 20:31:03,566 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-10-23 20:31:03,566 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 95 [2020-10-23 20:31:03,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 20:31:03,602 INFO L225 Difference]: With dead ends: 22912 [2020-10-23 20:31:03,603 INFO L226 Difference]: Without dead ends: 15165 [2020-10-23 20:31:03,623 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-10-23 20:31:03,645 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15165 states. [2020-10-23 20:31:05,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15165 to 15164. [2020-10-23 20:31:05,249 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15164 states. [2020-10-23 20:31:05,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15164 states to 15164 states and 19643 transitions. [2020-10-23 20:31:05,271 INFO L78 Accepts]: Start accepts. Automaton has 15164 states and 19643 transitions. Word has length 95 [2020-10-23 20:31:05,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 20:31:05,271 INFO L481 AbstractCegarLoop]: Abstraction has 15164 states and 19643 transitions. [2020-10-23 20:31:05,271 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-23 20:31:05,271 INFO L276 IsEmpty]: Start isEmpty. Operand 15164 states and 19643 transitions. [2020-10-23 20:31:05,282 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-10-23 20:31:05,282 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 20:31:05,283 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 20:31:05,283 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-10-23 20:31:05,283 INFO L429 AbstractCegarLoop]: === Iteration 16 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 20:31:05,283 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 20:31:05,283 INFO L82 PathProgramCache]: Analyzing trace with hash 758365347, now seen corresponding path program 1 times [2020-10-23 20:31:05,284 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 20:31:05,284 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1912570448] [2020-10-23 20:31:05,284 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 20:31:05,286 INFO L321 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-10-23 20:31:05,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 20:31:05,348 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 20:31:05,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 20:31:05,359 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 20:31:05,359 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1912570448] [2020-10-23 20:31:05,360 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 20:31:05,360 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-10-23 20:31:05,360 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [733198144] [2020-10-23 20:31:05,360 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-23 20:31:05,361 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 20:31:05,361 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-23 20:31:05,361 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-23 20:31:05,361 INFO L87 Difference]: Start difference. First operand 15164 states and 19643 transitions. Second operand 4 states. [2020-10-23 20:31:07,872 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 20:31:07,874 INFO L93 Difference]: Finished difference Result 17984 states and 23230 transitions. [2020-10-23 20:31:07,874 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-10-23 20:31:07,874 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 96 [2020-10-23 20:31:07,875 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 20:31:07,918 INFO L225 Difference]: With dead ends: 17984 [2020-10-23 20:31:07,918 INFO L226 Difference]: Without dead ends: 17981 [2020-10-23 20:31:07,927 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-10-23 20:31:07,945 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17981 states. [2020-10-23 20:31:09,728 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17981 to 15164. [2020-10-23 20:31:09,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15164 states. [2020-10-23 20:31:09,752 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15164 states to 15164 states and 19515 transitions. [2020-10-23 20:31:09,753 INFO L78 Accepts]: Start accepts. Automaton has 15164 states and 19515 transitions. Word has length 96 [2020-10-23 20:31:09,753 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 20:31:09,753 INFO L481 AbstractCegarLoop]: Abstraction has 15164 states and 19515 transitions. [2020-10-23 20:31:09,753 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-23 20:31:09,753 INFO L276 IsEmpty]: Start isEmpty. Operand 15164 states and 19515 transitions. [2020-10-23 20:31:09,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-10-23 20:31:09,764 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 20:31:09,764 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 20:31:09,764 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-10-23 20:31:09,764 INFO L429 AbstractCegarLoop]: === Iteration 17 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 20:31:09,765 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 20:31:09,765 INFO L82 PathProgramCache]: Analyzing trace with hash -646305047, now seen corresponding path program 1 times [2020-10-23 20:31:09,765 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 20:31:09,765 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1493441793] [2020-10-23 20:31:09,765 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 20:31:09,767 INFO L321 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-10-23 20:31:09,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 20:31:09,806 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 20:31:09,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 20:31:09,816 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 20:31:09,817 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1493441793] [2020-10-23 20:31:09,817 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 20:31:09,817 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-10-23 20:31:09,817 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [175216524] [2020-10-23 20:31:09,818 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-23 20:31:09,818 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 20:31:09,818 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-23 20:31:09,819 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-23 20:31:09,819 INFO L87 Difference]: Start difference. First operand 15164 states and 19515 transitions. Second operand 4 states. [2020-10-23 20:31:13,266 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 20:31:13,266 INFO L93 Difference]: Finished difference Result 44608 states and 57406 transitions. [2020-10-23 20:31:13,266 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-10-23 20:31:13,266 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 96 [2020-10-23 20:31:13,267 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 20:31:13,326 INFO L225 Difference]: With dead ends: 44608 [2020-10-23 20:31:13,326 INFO L226 Difference]: Without dead ends: 29501 [2020-10-23 20:31:13,365 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-10-23 20:31:13,389 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29501 states. [2020-10-23 20:31:17,277 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29501 to 29500. [2020-10-23 20:31:17,277 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29500 states. [2020-10-23 20:31:17,338 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29500 states to 29500 states and 37435 transitions. [2020-10-23 20:31:17,338 INFO L78 Accepts]: Start accepts. Automaton has 29500 states and 37435 transitions. Word has length 96 [2020-10-23 20:31:17,339 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 20:31:17,339 INFO L481 AbstractCegarLoop]: Abstraction has 29500 states and 37435 transitions. [2020-10-23 20:31:17,339 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-23 20:31:17,339 INFO L276 IsEmpty]: Start isEmpty. Operand 29500 states and 37435 transitions. [2020-10-23 20:31:17,357 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2020-10-23 20:31:17,357 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 20:31:17,357 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 20:31:17,357 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-10-23 20:31:17,357 INFO L429 AbstractCegarLoop]: === Iteration 18 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 20:31:17,358 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 20:31:17,358 INFO L82 PathProgramCache]: Analyzing trace with hash 23734231, now seen corresponding path program 1 times [2020-10-23 20:31:17,358 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 20:31:17,358 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [495731439] [2020-10-23 20:31:17,359 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 20:31:17,363 INFO L321 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-10-23 20:31:17,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 20:31:17,424 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 20:31:17,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 20:31:17,435 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 20:31:17,435 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [495731439] [2020-10-23 20:31:17,436 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 20:31:17,436 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-10-23 20:31:17,436 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [978152159] [2020-10-23 20:31:17,436 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-23 20:31:17,436 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 20:31:17,437 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-23 20:31:17,444 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-23 20:31:17,444 INFO L87 Difference]: Start difference. First operand 29500 states and 37435 transitions. Second operand 4 states. [2020-10-23 20:31:21,557 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 20:31:21,557 INFO L93 Difference]: Finished difference Result 34624 states and 43582 transitions. [2020-10-23 20:31:21,557 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-10-23 20:31:21,557 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 97 [2020-10-23 20:31:21,558 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 20:31:21,594 INFO L225 Difference]: With dead ends: 34624 [2020-10-23 20:31:21,595 INFO L226 Difference]: Without dead ends: 34621 [2020-10-23 20:31:21,603 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-10-23 20:31:21,635 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34621 states. [2020-10-23 20:31:25,550 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34621 to 29500. [2020-10-23 20:31:25,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29500 states. [2020-10-23 20:31:25,599 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29500 states to 29500 states and 37179 transitions. [2020-10-23 20:31:25,599 INFO L78 Accepts]: Start accepts. Automaton has 29500 states and 37179 transitions. Word has length 97 [2020-10-23 20:31:25,599 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 20:31:25,599 INFO L481 AbstractCegarLoop]: Abstraction has 29500 states and 37179 transitions. [2020-10-23 20:31:25,599 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-23 20:31:25,599 INFO L276 IsEmpty]: Start isEmpty. Operand 29500 states and 37179 transitions. [2020-10-23 20:31:25,612 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2020-10-23 20:31:25,612 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 20:31:25,612 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 20:31:25,613 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-10-23 20:31:25,613 INFO L429 AbstractCegarLoop]: === Iteration 19 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 20:31:25,613 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 20:31:25,614 INFO L82 PathProgramCache]: Analyzing trace with hash 1447016098, now seen corresponding path program 1 times [2020-10-23 20:31:25,614 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 20:31:25,614 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1551654988] [2020-10-23 20:31:25,614 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 20:31:25,616 INFO L321 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-10-23 20:31:25,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 20:31:25,673 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 20:31:25,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 20:31:25,686 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 20:31:25,686 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1551654988] [2020-10-23 20:31:25,686 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 20:31:25,687 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-10-23 20:31:25,687 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1237618117] [2020-10-23 20:31:25,687 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-23 20:31:25,687 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 20:31:25,688 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-23 20:31:25,688 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-23 20:31:25,688 INFO L87 Difference]: Start difference. First operand 29500 states and 37179 transitions. Second operand 4 states. [2020-10-23 20:31:33,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 20:31:33,496 INFO L93 Difference]: Finished difference Result 86848 states and 109374 transitions. [2020-10-23 20:31:33,496 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-10-23 20:31:33,496 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 97 [2020-10-23 20:31:33,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 20:31:33,559 INFO L225 Difference]: With dead ends: 86848 [2020-10-23 20:31:33,559 INFO L226 Difference]: Without dead ends: 57405 [2020-10-23 20:31:33,641 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-10-23 20:31:33,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57405 states. [2020-10-23 20:31:40,649 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57405 to 57404. [2020-10-23 20:31:40,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57404 states. [2020-10-23 20:31:40,752 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57404 states to 57404 states and 71227 transitions. [2020-10-23 20:31:40,752 INFO L78 Accepts]: Start accepts. Automaton has 57404 states and 71227 transitions. Word has length 97 [2020-10-23 20:31:40,753 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 20:31:40,753 INFO L481 AbstractCegarLoop]: Abstraction has 57404 states and 71227 transitions. [2020-10-23 20:31:40,753 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-23 20:31:40,753 INFO L276 IsEmpty]: Start isEmpty. Operand 57404 states and 71227 transitions. [2020-10-23 20:31:40,775 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2020-10-23 20:31:40,776 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 20:31:40,776 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 20:31:40,776 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-10-23 20:31:40,776 INFO L429 AbstractCegarLoop]: === Iteration 20 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 20:31:40,777 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 20:31:40,777 INFO L82 PathProgramCache]: Analyzing trace with hash -1274982353, now seen corresponding path program 1 times [2020-10-23 20:31:40,777 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 20:31:40,777 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1841949227] [2020-10-23 20:31:40,778 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 20:31:40,789 INFO L321 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-10-23 20:31:40,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 20:31:40,837 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 20:31:40,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 20:31:40,848 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 20:31:40,849 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1841949227] [2020-10-23 20:31:40,849 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 20:31:40,849 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-10-23 20:31:40,849 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [590913522] [2020-10-23 20:31:40,850 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-23 20:31:40,850 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 20:31:40,851 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-23 20:31:40,851 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-23 20:31:40,851 INFO L87 Difference]: Start difference. First operand 57404 states and 71227 transitions. Second operand 4 states. [2020-10-23 20:31:49,190 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 20:31:49,190 INFO L93 Difference]: Finished difference Result 66624 states and 81470 transitions. [2020-10-23 20:31:49,191 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-10-23 20:31:49,191 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 98 [2020-10-23 20:31:49,191 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 20:31:49,276 INFO L225 Difference]: With dead ends: 66624 [2020-10-23 20:31:49,276 INFO L226 Difference]: Without dead ends: 66621 [2020-10-23 20:31:49,289 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-10-23 20:31:49,327 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66621 states. [2020-10-23 20:31:56,528 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66621 to 57404. [2020-10-23 20:31:56,528 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57404 states. [2020-10-23 20:31:56,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57404 states to 57404 states and 70715 transitions. [2020-10-23 20:31:56,625 INFO L78 Accepts]: Start accepts. Automaton has 57404 states and 70715 transitions. Word has length 98 [2020-10-23 20:31:56,625 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 20:31:56,625 INFO L481 AbstractCegarLoop]: Abstraction has 57404 states and 70715 transitions. [2020-10-23 20:31:56,626 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-23 20:31:56,626 INFO L276 IsEmpty]: Start isEmpty. Operand 57404 states and 70715 transitions. [2020-10-23 20:31:56,648 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2020-10-23 20:31:56,648 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 20:31:56,648 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 20:31:56,648 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-10-23 20:31:56,649 INFO L429 AbstractCegarLoop]: === Iteration 21 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 20:31:56,649 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 20:31:56,649 INFO L82 PathProgramCache]: Analyzing trace with hash 1915473685, now seen corresponding path program 1 times [2020-10-23 20:31:56,649 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 20:31:56,649 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2033639335] [2020-10-23 20:31:56,649 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 20:31:56,651 INFO L321 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-10-23 20:31:56,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 20:31:56,711 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 20:31:56,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 20:31:56,723 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 20:31:56,724 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2033639335] [2020-10-23 20:31:56,724 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 20:31:56,724 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-10-23 20:31:56,724 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2020667546] [2020-10-23 20:31:56,725 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-23 20:31:56,725 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 20:31:56,725 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-23 20:31:56,725 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-23 20:31:56,725 INFO L87 Difference]: Start difference. First operand 57404 states and 70715 transitions. Second operand 4 states. [2020-10-23 20:32:11,196 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 20:32:11,197 INFO L93 Difference]: Finished difference Result 169023 states and 207933 transitions. [2020-10-23 20:32:11,200 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-10-23 20:32:11,200 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 98 [2020-10-23 20:32:11,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 20:32:11,304 INFO L225 Difference]: With dead ends: 169023 [2020-10-23 20:32:11,304 INFO L226 Difference]: Without dead ends: 57404 [2020-10-23 20:32:11,417 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-10-23 20:32:11,456 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57404 states. [2020-10-23 20:32:18,700 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57404 to 57404. [2020-10-23 20:32:18,701 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57404 states. [2020-10-23 20:32:18,801 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57404 states to 57404 states and 68667 transitions. [2020-10-23 20:32:18,802 INFO L78 Accepts]: Start accepts. Automaton has 57404 states and 68667 transitions. Word has length 98 [2020-10-23 20:32:18,802 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 20:32:18,802 INFO L481 AbstractCegarLoop]: Abstraction has 57404 states and 68667 transitions. [2020-10-23 20:32:18,802 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-23 20:32:18,802 INFO L276 IsEmpty]: Start isEmpty. Operand 57404 states and 68667 transitions. [2020-10-23 20:32:18,822 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2020-10-23 20:32:18,823 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 20:32:18,823 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 20:32:18,823 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-10-23 20:32:18,823 INFO L429 AbstractCegarLoop]: === Iteration 22 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 20:32:18,824 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 20:32:18,824 INFO L82 PathProgramCache]: Analyzing trace with hash 1414488035, now seen corresponding path program 1 times [2020-10-23 20:32:18,824 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 20:32:18,824 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1769479205] [2020-10-23 20:32:18,824 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 20:32:18,826 INFO L321 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-10-23 20:32:18,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 20:32:18,888 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 20:32:18,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 20:32:18,902 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 20:32:18,902 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1769479205] [2020-10-23 20:32:18,902 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 20:32:18,903 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-10-23 20:32:18,903 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2039385899] [2020-10-23 20:32:18,903 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-23 20:32:18,903 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 20:32:18,904 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-23 20:32:18,904 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-23 20:32:18,904 INFO L87 Difference]: Start difference. First operand 57404 states and 68667 transitions. Second operand 4 states. [2020-10-23 20:32:26,140 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 20:32:26,141 INFO L93 Difference]: Finished difference Result 57404 states and 68667 transitions. [2020-10-23 20:32:26,141 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-10-23 20:32:26,141 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 99 [2020-10-23 20:32:26,142 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 20:32:26,142 INFO L225 Difference]: With dead ends: 57404 [2020-10-23 20:32:26,142 INFO L226 Difference]: Without dead ends: 0 [2020-10-23 20:32:26,224 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-10-23 20:32:26,224 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-10-23 20:32:26,225 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-10-23 20:32:26,225 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-10-23 20:32:26,225 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-10-23 20:32:26,225 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 99 [2020-10-23 20:32:26,225 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 20:32:26,225 INFO L481 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-10-23 20:32:26,225 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-23 20:32:26,225 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-10-23 20:32:26,226 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-10-23 20:32:26,226 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-10-23 20:32:26,228 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-10-23 20:32:45,685 WARN L193 SmtUtils]: Spent 19.33 s on a formula simplification. DAG size of input: 4288 DAG size of output: 34 [2020-10-23 20:32:49,950 WARN L193 SmtUtils]: Spent 4.24 s on a formula simplification. DAG size of input: 2102 DAG size of output: 31 [2020-10-23 20:33:48,370 WARN L193 SmtUtils]: Spent 58.41 s on a formula simplification that was a NOOP. DAG size: 2125 [2020-10-23 20:34:05,208 WARN L193 SmtUtils]: Spent 16.82 s on a formula simplification. DAG size of input: 2134 DAG size of output: 581 [2020-10-23 20:34:07,587 WARN L193 SmtUtils]: Spent 2.37 s on a formula simplification. DAG size of input: 1091 DAG size of output: 189 [2020-10-23 20:34:10,345 WARN L193 SmtUtils]: Spent 2.74 s on a formula simplification. DAG size of input: 1120 DAG size of output: 191 [2020-10-23 20:34:12,059 WARN L193 SmtUtils]: Spent 1.71 s on a formula simplification. DAG size of input: 1216 DAG size of output: 87 [2020-10-23 20:34:16,135 WARN L193 SmtUtils]: Spent 4.04 s on a formula simplification. DAG size of input: 2107 DAG size of output: 45 [2020-10-23 20:35:03,141 WARN L193 SmtUtils]: Spent 46.99 s on a formula simplification. DAG size of input: 5285 DAG size of output: 31 [2020-10-23 20:35:10,569 WARN L193 SmtUtils]: Spent 7.42 s on a formula simplification. DAG size of input: 1095 DAG size of output: 581 [2020-10-23 20:35:19,704 WARN L193 SmtUtils]: Spent 9.12 s on a formula simplification. DAG size of input: 3010 DAG size of output: 53 [2020-10-23 20:35:34,606 WARN L193 SmtUtils]: Spent 14.90 s on a formula simplification that was a NOOP. DAG size: 1099 [2020-10-23 20:35:49,636 WARN L193 SmtUtils]: Spent 15.02 s on a formula simplification. DAG size of input: 2752 DAG size of output: 41 [2020-10-23 20:35:54,084 WARN L193 SmtUtils]: Spent 4.44 s on a formula simplification. DAG size of input: 2111 DAG size of output: 65 [2020-10-23 20:36:24,600 WARN L193 SmtUtils]: Spent 30.50 s on a formula simplification. DAG size of input: 4797 DAG size of output: 31 [2020-10-23 20:36:25,635 WARN L193 SmtUtils]: Spent 1.03 s on a formula simplification. DAG size of input: 1076 DAG size of output: 31 [2020-10-23 20:36:35,494 WARN L193 SmtUtils]: Spent 9.85 s on a formula simplification. DAG size of input: 2146 DAG size of output: 321 [2020-10-23 20:36:37,510 WARN L193 SmtUtils]: Spent 2.01 s on a formula simplification. DAG size of input: 1144 DAG size of output: 123 [2020-10-23 20:36:39,359 WARN L193 SmtUtils]: Spent 1.84 s on a formula simplification. DAG size of input: 1312 DAG size of output: 67 [2020-10-23 20:37:35,193 WARN L193 SmtUtils]: Spent 55.81 s on a formula simplification. DAG size of input: 5312 DAG size of output: 31 [2020-10-23 20:37:40,643 WARN L193 SmtUtils]: Spent 5.44 s on a formula simplification. DAG size of input: 2115 DAG size of output: 121 [2020-10-23 20:37:41,735 WARN L193 SmtUtils]: Spent 1.08 s on a formula simplification. DAG size of input: 1081 DAG size of output: 45 [2020-10-23 20:38:01,150 WARN L193 SmtUtils]: Spent 19.40 s on a formula simplification. DAG size of input: 3778 DAG size of output: 45 [2020-10-23 20:38:09,002 WARN L193 SmtUtils]: Spent 7.85 s on a formula simplification. DAG size of input: 1102 DAG size of output: 583 [2020-10-23 20:38:25,507 WARN L193 SmtUtils]: Spent 16.48 s on a formula simplification. DAG size of input: 4288 DAG size of output: 34 [2020-10-23 20:39:22,615 WARN L193 SmtUtils]: Spent 57.08 s on a formula simplification. DAG size of input: 5312 DAG size of output: 31 [2020-10-23 20:40:06,860 WARN L193 SmtUtils]: Spent 44.23 s on a formula simplification. DAG size of input: 5235 DAG size of output: 31 [2020-10-23 20:40:16,931 WARN L193 SmtUtils]: Spent 10.06 s on a formula simplification. DAG size of input: 2119 DAG size of output: 321 [2020-10-23 20:40:18,104 WARN L193 SmtUtils]: Spent 1.17 s on a formula simplification. DAG size of input: 1085 DAG size of output: 65 [2020-10-23 20:40:25,115 WARN L193 SmtUtils]: Spent 7.00 s on a formula simplification. DAG size of input: 2194 DAG size of output: 189 [2020-10-23 20:40:26,870 WARN L193 SmtUtils]: Spent 1.75 s on a formula simplification. DAG size of input: 1216 DAG size of output: 87 [2020-10-23 20:40:29,788 WARN L193 SmtUtils]: Spent 2.91 s on a formula simplification. DAG size of input: 1600 DAG size of output: 55 [2020-10-23 20:40:54,856 WARN L193 SmtUtils]: Spent 25.03 s on a formula simplification. DAG size of input: 4411 DAG size of output: 31 [2020-10-23 20:41:24,484 WARN L193 SmtUtils]: Spent 29.62 s on a formula simplification. DAG size of input: 2123 DAG size of output: 1097 [2020-10-23 20:41:26,211 WARN L193 SmtUtils]: Spent 1.71 s on a formula simplification. DAG size of input: 1089 DAG size of output: 121 [2020-10-23 20:41:40,798 WARN L193 SmtUtils]: Spent 14.58 s on a formula simplification that was a NOOP. DAG size: 1099 [2020-10-23 20:42:39,744 WARN L193 SmtUtils]: Spent 58.93 s on a formula simplification. DAG size of input: 5314 DAG size of output: 39 [2020-10-23 20:42:44,225 WARN L193 SmtUtils]: Spent 4.48 s on a formula simplification. DAG size of input: 1108 DAG size of output: 323 [2020-10-23 20:42:48,291 WARN L193 SmtUtils]: Spent 4.05 s on a formula simplification. DAG size of input: 2105 DAG size of output: 39 [2020-10-23 20:43:39,398 WARN L193 SmtUtils]: Spent 51.09 s on a formula simplification. DAG size of input: 5307 DAG size of output: 31 [2020-10-23 20:43:43,208 WARN L193 SmtUtils]: Spent 3.80 s on a formula simplification. DAG size of input: 2102 DAG size of output: 31 [2020-10-23 20:43:49,137 WARN L193 SmtUtils]: Spent 5.92 s on a formula simplification. DAG size of input: 2242 DAG size of output: 121 [2020-10-23 20:43:53,371 WARN L193 SmtUtils]: Spent 4.23 s on a formula simplification. DAG size of input: 1093 DAG size of output: 321 [2020-10-23 20:43:55,184 WARN L193 SmtUtils]: Spent 1.81 s on a formula simplification. DAG size of input: 1312 DAG size of output: 67 [2020-10-23 20:44:00,864 WARN L193 SmtUtils]: Spent 5.67 s on a formula simplification. DAG size of input: 1984 DAG size of output: 47 [2020-10-23 20:44:05,149 WARN L193 SmtUtils]: Spent 4.25 s on a formula simplification. DAG size of input: 2109 DAG size of output: 53 [2020-10-23 20:44:46,102 WARN L193 SmtUtils]: Spent 40.94 s on a formula simplification. DAG size of input: 5185 DAG size of output: 31